Activity for aro
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aro posted a comment on discussion Help/Technical support
Hello Lung-An, To see the ِDiesel_DG parameters type the following sentence (in gridlabd): gridlabd --modhelp generators:diesel_dg Correction your file: object diesel_dg { name DIESEL_1; parent node001; flags DELTAMODE; //Enable deltamode on the model Rated_V 4160.0; //Need to set the Line-to-line rating Rated_VA 1.0 MVA; //Just picked an arbitrary size //Gen_type SYNCHRONOUS; //This value does nothing Gen_type DYN_SYNCHRONOUS; //This is the proper value rotor_speed_convergence ${rotor_convergence};...
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Hello Dear Frank Thank you very much -aro
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Hello Dear Frank You were right. ( the GFA works on constant_current loads ,...) About using the GFA and CVR simultaneously: I changed the parameters and the simulation resulted well. (CVR_Kd1 200---->CVR_Kd1 10) Thank you very much -aro
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Hello Dear Frank You were right. ( the GFA works on constant_current loads ,...) About using the GFA and CVR simultaneously: I changed the parameters and the simulation resulted well. (CVR_Kd1 200---->CVR_Kd1 10) But I have a question: Why the GFA affect the CVR? While the CVR is related to the Diesel_DG and the combination of GFA and CVR should improve the results (frequency stability) Thank you very much -aro
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Hello again Dear Frank, in this link: Why the voltage decrease from the set value(0.05)? and Is the node151 voltage, the average voltage of the three-phase?(in article) Thank you -aro
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Hello again Dear Frank, In the above figure: Why the voltage decrease from the set value(0.05)? and Is the node151 voltage, the average voltage of the three-phase?(in article) Thank you -aro
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Hello Dear Frank You were right. ( the GFA works on constant_current loads ,...) About using the GFA and CVR simultaneously: I changed the parameters and the simulation resulted well. But I have a question: Why the GFA affect the CVR? While the CVR is related to the Diesel_DG and the combination of GFA and CVR should improve the results (frequency stability) Thank you very much -aro
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Hello Dear Frank
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Hello Dear Frank I install gridlabd successfully.(👍) Then I simulated the following article . (CVR) ( article: https://ieeexplore.ieee.org/document/8419724/ ) simulate result: Then I enabled the GFA and CVR simultaneously (in one glm file). which caused the collapse of the microgrids network!! While just the CVR kept the system stable (alone). when I run GFA and CVR simultaneously, the system collapse (The results are like when I run the the glm file without CVR). I think, the GFA and CVR don't run...
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Hello Dear Frank I install gridlabd successfully.(👍) Then I simulated the following article . (CVR) ( article: https://ieeexplore.ieee.org/document/8419724/ ) my result: Then I enabled the GFA and CVR simultaneously (in one glm file). which caused the collapse of the microgrids network!! While just the CVR kept the system stable (alone). when I run GFA and CVR simultaneously, the system collapse (The results are like when I run the the glm file without CVR). I think, the GFA and CVR don't run simultaneously....
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Hello Dear Frank I install gridlabd successfully.(👍) Then I simulated the following article . (CVR) ( article: https://ieeexplore.ieee.org/document/8419724/ ) Then I enabled the GFA and CVR simultaneously (in one glm file). which caused the collapse of the microgrids network!! While just the CVR kept the system stable (alone). when I run GFA and CVR simultaneously, the system collapse (The results are like when I run the the glm file without CVR). I think, the GFA and CVR don't run simultaneously....
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Hello Dear Frank Thank you for your quick reply the problem was fixed and I built the install64 folder. (gridlabd4.1) But I do not know how to run the .glm programs by this folder!!! I used the gridlabd.exe: (at bin folder) but I encountered the following error: How can I use the built folder and run my glm files? Thank you very much -aro
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Hello Dear Frank Thank you for your quick reply the problem was fixed and I built the install64 folder. (gridlabd4.1) But I do not know how to run the .glm programs by this folder!!! I used the gridlabd.exe: (at bin folder) but I encountered the following error: How can I use the built folder and run my glm files? Thank you very much -aro
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Hello Gridlab-D team & Dear Frank I want to build gridlabd using the msys2 (by :BuildingGridlabdOnWindowsWithMsys2.docx) and all the steps are done correctly. but finally, the following errors occurs and the install64 folder can not be created. make: . . make install what's wrong? my repository is:gridlab-d-release-RC4.1 Thank you very much -aro
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Hello Gridlab-D team & Dear Frank I want to build gridlabd using the msys2 (by :BuildingGridlabdOnWindowsWithMsys2.docx) and all the steps are done correctly. but finally, the following errors occurs: make: . . make install what's wrong? my repository is:gridlab-d-release-RC4.1 Thank you very much -aro
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Hello Hongda Ren really I do not know!!! But I changed the following statement. #define rotor_convergence=0.00000000000001 And I think the problem is solved. -aro
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Hello Hongda Ren Use these files . I hope to be useful -aro
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Hello Dear Frank I had already converted the WORD to PDF . and inside the PDF : autoreconf -if had changed to: autoreconf –if !!! (minus sign) And it was just a typing mistake. Thank you very much -aro
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Hello Dear Frank As you mentioned, I manipulated that dynamic parameters and the problem was solved. Thank you very much -aro
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Hello Dear Frank As you mentioned, I manipulated that dynamic parameters and it was fixed. Thank you very much -aro
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Hello Dear Frank As you mentioned, I manipulated that dynamic parameters and it was fixed. Thank you very much -aro
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Hello Brian see : this link and this file : link I hope this could help you ! -aro
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Hello Brian see : this link and this file : link I hope this could help youu ! -aro
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Hi GridLAB-D Team, In my simulation model (DELTA MODE), I've increased the rated_power (=300 kW) of solar and the following errors occurs: WARNING: Line:1-7 is at 144.82% of its continuous rating on phase C! . . . ERROR: Neton-Rafson failed to converge the dynamic powerflow, sticking at same iteration. But this does not happen when the rated_power of the solar is equal to 100 kW and the simulation works well. How to solve this problem? (or this restriction is ignored by gridlab-d) Thanks. -aro
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Hello Dear Frank I have chosen my Git repository here: link, Is this correct? here: linkRC4.1, I can not use the Git Bash or GitHub Desktop for cloning the 4.1 repository and I download ZIP file ( link) In other words, the cloning address is as: (https://github.com/gridlab-d/gridlab-d.git)(belongs to the 4.0 repository) with this repository link, there is still an error: autoreconf: 'configure.ac' or 'confiure.in'is required What is my mistake ? Thank you very much -aro
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Hello Dear Frank I have chosen my Git repository here: link, Is this correct? here: linkRC4.1, I can not use the Git Bash or GitHub Desktop for cloning the 4.1 repository and I download ZIP file ( link) In other words, the cloning address is as: (https://github.com/gridlab-d/gridlab-d.git)(belongs to the 4.0 repository) with this repository link, there is still an error: autoreconf: 'configure.ac' or 'confiure.in'is required What is my fault? Thank you very much -aro
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Hello Dear Frank I have chosen my Git repository here: link, Is this correct? here: linkRC4.1, I can not use the Git Bash or GitHub Desktop for cloning the 4.1 repository and I download ZIP file ( link) In other words, the cloning address is as: (https://github.com/gridlab-d/gridlab-d.git)(belongs to the 4.0 repository) What is my fault? Thank you very much -aro
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Hello Dear Frank I encountered the following problem: While the (configure.ac) is at (c:\gridlabd) . by runing : autoreconf configure.ac Aro@Aro-PC MSYS /c/gridlabd $ autoreconf configure.ac configure.ac:491: error: required file 'build-aux/ar-lib' not found configure.ac:491: 'automake --add-missing' can install 'ar-lib' configure.ac:104: error: required file 'build-aux/compile' not found configure.ac:104: 'automake --add-missing' can install 'compile' configure.ac:54: error: required file 'build-aux/config.guess'...
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Hello Dear Frank I encountered the following problem: While the (configure.ac) is at (c:\gridlabd) . by runing : autoreconf configure.ac Aro@Aro-PC MSYS /c/gridlabd $ autoreconf configure.ac configure.ac:491: error: required file 'build-aux/ar-lib' not found configure.ac:491: 'automake --add-missing' can install 'ar-lib' configure.ac:104: error: required file 'build-aux/compile' not found configure.ac:104: 'automake --add-missing' can install 'compile' configure.ac:54: error: required file 'build-aux/config.guess'...
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Hello Dear Frank I encountered the following problem: While the (configure.ac) is at (c:\gridlabd) . by runing : autoreconf configure.ac Aro@Aro-PC MSYS /c/gridlabd $ autoreconf configure.ac configure.ac:491: error: required file 'build-aux/ar-lib' not found configure.ac:491: 'automake --add-missing' can install 'ar-lib' configure.ac:104: error: required file 'build-aux/compile' not found configure.ac:104: 'automake --add-missing' can install 'compile' configure.ac:54: error: required file 'build-aux/config.guess'...
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Hello Dear Frank I encountered the following problem: While the (configure.ac) is at (c:\gridlabd) . by runing : autoreconf configure.ac Aro@Aro-PC MSYS /c/gridlabd $ autoreconf configure.ac configure.ac:491: error: required file 'build-aux/ar-lib' not found configure.ac:491: 'automake --add-missing' can install 'ar-lib' configure.ac:104: error: required file 'build-aux/compile' not found configure.ac:104: 'automake --add-missing' can install 'compile' configure.ac:54: error: required file 'build-aux/config.guess'...
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Hello Dear Frank I encountered the following problem: Thank you very much -aro
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Hello Dear Frank Thank you very much -aro
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Hello Dear Frank Thank you for your quick reply Does the MSYS2 need to eclipse? (like:(MinGW/Eclipse install)) Thank you very much -aro
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Hello Dear Frank Thank you for your complete replies. I finally installed the Win-Builds. I did the steps in sequence (this link) and this file was not created: C:\Projects\GridLABD_Builds\863\install64\bin\gridlabd.bin.exe Instead exist this file : C:\Projects\GridLAB-D_Builds\863\install64\bin\gridlabd.exe Does it make a bug? in the end, there were different errors in running GLM files. Can I build gridlabd 4.1 with (MinGW/Eclipse_Installation)? I download this codes: (link) for building gridlabd_RC4.1...
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Hello Dear Frank In step: Installing dlfcn the following error occurs when I executing this file (BuildingGridlabdOnWindowsWithMsys2.docx). and the following error occurs when I executing this file (MinGW_Eclipse_Instructions.docx). And in both cases, the (opt\windows_64/...) file is not properly created. what's wrong? Thank you very much for your help -aro
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Hello Dear Frank The following error occurs when I executing this file (MinGW_Eclipse_Instructions.docx). and the following error occurs when I executing this file (BuildingGridlabdOnWindowsWithMsys2.docx). And in both cases, the (opt\windows_64/...) file is not properly created. what's wrong? Thank you very much for your help -aro
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Hello Dear Frank Thank you for your complete replies and your good advices You are right. The CVR codes are available here: (https://github.com/dchassin/gridlabd/blob/master/generators/diesel_dg.cpp). But they are not in my (gridlabd-4.0_RC1.exe). and for now (as long as I install the compiler) I do not know how to Compile this files (https://github.com/dchassin/gridlabd/) into a gridlabd.exe (4.1_RC1). I have two requests from you: 1. Please send me gridlabd-4.1_RC1.exe if it is possible, Because...
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Another question: In the (exciter.cpp) file the equations of state are as follows: I did not understand the (Exciter bias state variable) in the equations?? please guide me. -aro
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Hi GridLAB-D team, I want to make this controller in the Gridlab-D. ( article: https://ieeexplore.ieee.org/document/8419724/ ) But by executing the following command and looking at the diesel_dg.cpp , I understood that This fan does not exist in the GridLAB. I've separated the exciter (SEXS-type) codes. The code for the exciter is: (exciter.cpp) Question’s: 1. How to add the improving controller at the Gridlab-d? 2. What software is needed to add a new code in .cpp file and convert it to .dll file...
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Hi GridLAB-D team, I want to make this controller in the Gridlab-D. ( article: https://ieeexplore.ieee.org/document/8419724/ ) But by executing the following command and looking at the diesel_dg.cpp , I understood that This fan does not exist in the GridLAB. I've separated the exciter (SEXS-type) codes. The code for the exciter is: (exciter.cpp) Question’s: 1. How to add the improving controller at the Gridlab-d? 2. What software is needed to add a new code in .cpp file and convert it to .dll file...
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Hello Dear Frank thanks for your reply. I think I have a long path in learning the GridLab-D (So hard!!). Thank you -aro
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Hello Dear Frank At first, Apologies for the delay in appreciation from you. How can I access internal functions of the GFA (code) and change them? for example : the GFA instead of using the frequency (GFA_freq_low_trip) uses frequency derivatives. How can I upgrade and develop the GFA? Thank you -aro
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Hi Paddysomnang run below file:
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Hi Paddysomnang Look at the line (283): object line_spacing:510 { distance_AC 0.0; distance_AB 0.0; distance_BC 0.0; distance_AN 0.0; distance_CN 5.0; distance_BN 0.0;} Change it : object line_spacing:510 { distance_AC 0.0; distance_AB 0.0; distance_BC 0.0; distance_AN 0.0; distance_CN 5.0; distance_BN 0.0; } !!!
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Hi Paddysomnang Look at the line (283): object line_spacing:510 { distance_AC 0.0; distance_AB 0.0; distance_BC 0.0; distance_AN 0.0; distance_CN 5.0; distance_BN 0.0;} Change it : ~~~ object line_spacing:510 { distance_AC 0.0; distance_AB 0.0; distance_BC 0.0; distance_AN 0.0; distance_CN 5.0; distance_BN 0.0; } ~~~ !!!
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Hi Paddysomnang Look at the line (283): object line_spacing:510 { distance_AC 0.0; distance_AB 0.0; distance_BC 0.0; distance_AN 0.0; distance_CN 5.0; distance_BN 0.0;} Change it : ~~~ object line_spacing:510 { distance_AC 0.0; distance_AB 0.0; distance_BC 0.0; distance_AN 0.0; distance_CN 5.0; distance_BN 0.0; } ~~~ !!!
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Hi Paddysomnang Look at the line (283): object line_spacing:510 { distance_AC 0.0; distance_AB 0.0; distance_BC 0.0; distance_AN 0.0; distance_CN 5.0; distance_BN 0.0;} Change it : object line_spacing:510 { distance_AC 0.0; distance_AB 0.0; distance_BC 0.0; distance_AN 0.0; distance_CN 5.0; distance_BN 0.0; } !!!
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Hi Paddysomnang Look at the line (283): object line_spacing:510 { distance_AC 0.0; distance_AB 0.0; distance_BC 0.0; distance_AN 0.0; distance_CN 5.0; distance_BN 0.0;} Change it : object line_spacing:510 { distance_AC 0.0; distance_AB 0.0; distance_BC 0.0; distance_AN 0.0; distance_CN 5.0; distance_BN 0.0; } !!!
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Hello Jason Fuller I sent you the following codes. The LOAD2 is as follows: object load { name LOAD2; parent node002; phases ABC; frequency_measure_type PLL; //Have to enable the frequency measurement behavior nominal_voltage 2401.7771; constant_power_A 2000.0+1500.0j; constant_power_B 2500.0+1000.0j; constant_power_C 2100.0+1750.0j; } I want when the frequency became less than 376.8 (rotor speed), the load2 changed (from 2000.0+1500.0j ------to------> 20.0+50.0j ). target matlab workdir . window...
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Hello dear Jason Fuller I want to make something like a GFA appliance controller but with the help of the MATLAB. for example, If the frequency became less than Specified value, the load changed after 50 seconds. and I take the frequency from the diesel DGs. I also searched for GFA codes but I did not find it. can you send them to me? and I really did not understand the meaning of this: (Your 't' value needs to be in unix epoch time, not a text string, if you are using time as the "if/then".) Thank...
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Hi Paddysomnang Call up #include "exercise_7.glm" in :IEEE_37bus.glm and change interval interval 0 ------> interval 1
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Hello thanks for your reply. But I did not quite understand how you got this number (996667222)? In fact, I want to change the amount of load when the frequency falls below a certain limit (less than 49.4) m_file function [loadmodifier] = matlabfunction(t) if f<49.4 loadmodifier=10000+80000j; else loadmodifier=150000+50000j; end But I do't see any changes in the output. How can I do it? thanks a lot -aro
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Hello Jason Fuller thanks for your reply. But I did not quite understand how you got this number (996667222)? In fact, I want to change the amount of load when the frequency falls below a certain limit (less than 49.4) m_file function [loadmodifier] = matlabfunction(t) if f<49.4 loadmodifier=10000+80000j; else loadmodifier=150000+50000j; end But I do't see any changes in the output. How can I do it? thanks a lot -aro
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Hi GridLAB-D team I want to change the amount of a load by Matalb link at a specified time (here after 22s). How can I do it? (I'm also aware of the usage of the object player). my codes: link_file: target matlab workdir . window keep global clock object on_init ans=GLD_OK; on_sync [y]=sillymatlabfunction();ans=TS_NEVER; on_term ans=GLD_OK; //////////////////////////////// import load.constant_power_A y //////////////////////////////// and m_file function [loadmodifier] = matlabfunction(t) t=clock;...
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Hi GridLAB-D team I want to change the amount of a load by Matalb link at a specified time (here after 22s). How can I do it? (I'm also aware of the usage of the object player). my codes: link_file: target matlab workdir . window keep global clock object on_init ans=GLD_OK; on_sync [y]=sillymatlabfunction();ans=TS_NEVER; on_term ans=GLD_OK; //////////////////////////////// import load.constant_power_A y //////////////////////////////// and m_file function [loadmodifier] = matlabfunction(t) global...
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and use an "object recorder" in one place feeder.glm or 37.glm You do not need use that in both
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and use an object recorder in one place feeder.glm or 37.glm You do not need use that in both
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and use a object recorder in one place feeder.glm or 37.glm You do not need use that in both
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Hello Paddysomnang feeder.glm corrected as: object recorder { parent node:781; property voltage_A,voltage_B,voltage_C; interval 0; file feeder.csv; } and in IEEE_37 (here 37.glm) Call up feeder.glm #include "feeder.glm"
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Hello Paddysomnang for this " ERROR [INIT] : object name '701-702' ", you can add #set relax_naming_rules=1; to your code. I looked at your code and I corrected them: clock { timestamp '2000-01-01 0:00:00'; stoptime '2000-01-01 1:00:00'; timezone EST+5EDT; } and in line 471 object node:781 { phases "ABC"; name n781; //bustype SWING; voltage_A 2400.0000-1385.640646j; voltage_B -2400.0000-1385.640646j; voltage_C 0.0000+2771.281292j; nominal_voltage 4800; object recorder { property voltage_A,voltage_B,voltage_C;...
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Hello dear Frank With the help of your file (glxmatlab.dll), my problem was resolved. But my model as you mentioned is deltamode and I need this linking (I'm very sad about this, i wish i knew this sooner). Because this linking is powerful tool. Is there really no way to linking, Considering the deltamode? thank you -aro
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Hello, GridLAB-D team I runed the attached codes in gridlab3.2 and run without problems. But I tested these codes in gridlabd-4.0_RC1 with Error(glxmatlab.dll ......). I need to work with GGOV1 on my work, and this is done by gridlabd-4.0_RC1. gridlab3.2 does not support GGOV1. I add the glxmatlabd.dll files (Which is posted by you on this page...both of them) to library. But again, I encountered the following error. and the workspace output: system: windows7 64bit matlab: R2016a 64bit please guide...
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Hello dear Frank Thank you for your suggestions and advice. best wishes -aro
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Hello dear Frank Thank you very much for your help I checked my codes. They had two problems. 1. In my codes: (node_151 and node_300 were SWING) but in your codes: (node_151 and node_300 are SWING_PQ) (multiple microgrids nodes) 2. And in my codes the governor also had default values but you have changed the default values (GGOV1). I have two questions: 1. How these GGOV1 control values be calculated according to the microgrid (with trial and error or set by a special procedure). 2. How can I create...
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Hello dear Frank Thank you very much for your help I checked my codes. They had two problems. 1. In my codes: (node_151 and node_300 were SWING) but in your codes: (node_151 and node_300 are SWING_PQ) (multiple microgrids nodes) 2. And in my codes the governor also had default values but you have changed the default values (GGOV1). I have two questions: 1. How these GGOV1 control values be calculated according to the network (with trial and error or set by a special procedure). 2. How can I create...
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Hello dear Frank Thank you very much for your help I checked my codes. They had two problems. 1. In my codes: (node_151 and node_300 were SWING) but in your codes: (node_151 and node_300 are SWING_PQ) (multiple microgrids nodes) 2. And in my codes the governor also had default values but you have changed the default values (GGOV1). I have two questions: 1. How these GGOV1 control values be calculated according to the network (with trial and error or set by a special procedure). 2. How can I create...
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Frank, thanks for your help actually, I want to simulate the first and second scenarios of this article http://ieeexplore.ieee.org/document/7857787/ that done by gridla-d. the shaded regions represent the boundaries of the three microgrids. End-use loads in these regions can be supplied by the microgrids when the substation voltage source is not present, those in the non-shaded region cannot. The distributed energy resources (DER) of the three microgrids are shown in Table I. For each of the nine...
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Frank, thanks for your help actually, I want to simulate the first and second scenarios of this article () that done by gridla-d. the shaded regions represent the boundaries of the three microgrids. End-use loads in these regions can be supplied by the microgrids when the substation voltage source is not present, those in the non-shaded region cannot. The distributed energy resources (DER) of the three microgrids are shown in Table I. For each of the nine generation sources, Table I indicates which...
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Frank, thanks for your help actually, I want to simulate the first and second scenarios of this article (http://ieeexplore.ieee.org/document/7857787/) that done by gridla-d. the shaded regions represent the boundaries of the three microgrids. End-use loads in these regions can be supplied by the microgrids when the substation voltage source is not present, those in the non-shaded region cannot. The distributed energy resources (DER) of the three microgrids are shown in Table I. For each of the nine...
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Hello, GridLAB-D team I have a microgrid that goes to the islanding mode and a diesel generator should supply microgrid. the microgrid load size is: 640 + 460j = 868VA. And the Diesel_DG specifications are as follows: object diesel_dg { parent node_151; name Gen_151; Rated_V 4160; Rated_VA 1800000; TotalRealPow 1500000; // 640 × 2≈1500 // pf 1; flags DELTAMODE; Gen_type DYN_SYNCHRONOUS; rotor_speed_convergence $ {rotor_convergence}; Exciter_type SEXS; Governor_type GGOV1; object recorder { property...
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Hello dear Frank Thank you very much -Aro
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Hello dear Frank I have some other questions. I have expressed them here. https://sourceforge.net/p/gridlab-d/discussion/842562/thread/6c00b077/ ... https://sourceforge.net/p/gridlab-d/discussion/842562/thread/6c00b077/#f56b .. Thank you very much for your help and your advice. -Aro
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Hello dear Frank Thank you very much, you have read my question carefully and your advice was very good and complete. After your guidance, I worked on the following network in deltamode (Figure 1). I put two switches (swBUS_2to_1) and (swBUS_2to_load) in the system. (BUS_1= bustype SWING) and (BUS_2= bustype SWING). In t=8, I opened two switches and the load was only supplied by the first generator (Diesel_dg1). As you said, the bus_1 acts like a PQ bus and that node does not remains as a SWING node...
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Hello dear Jason Fuller At first,thank you for your quick response. And can you send an example (.glm file) that the local network is separated from the main network and supplied by the DGs (islanding mode)? thanks a lot. -Aro
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Hello GRIDLAB-D Team I'm having trouble with islanding the system in gridlab-d, I found (test_multi_island.glm), but Actually in this example, I did not understand the concept of islanding. In this example(test_multi_island.glm), I want to use diesel_dg to supply load4C(Figure 1) , but when switch2B_2C is open (manual_outages "switch2B_2C,2000-01-01 00:00:04,2000-01-01 00:00:35";) the output of diesel_dg is zero and can not feed the load4C, why !!? I want to feed the load4C by diesel_dg in islanding...
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Hello GRIDLAB-D Team I'm having trouble with islanding the system in gridlab-d, I found (test_multi_island.glm), but Actually in this example, I did not understand the concept of islanding. In this example(test_multi_island.glm), I want to use diesel_dg to supply load4C(Figure 1) , but when switch2B_2C is open (manual_outages "switch2B_2C,2000-01-01 00:00:04,2000-01-01 00:00:35";) the output of diesel_dg is zero and can not feed the load4C, why !!? I want to feed the load4C by diesel_dg in islanding...
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Hello GRIDLAB-D Team I'm having trouble with islanding the system in gridlab-d, I found (test_multi_island.glm), but Actually in this example, I did not understand the concept of islanding. In this example(test_multi_island.glm), I want to use diesel_dg to supply load4C(Figure 1) , but when switch2B_2C is open (manual_outages "switch2B_2C,2000-01-01 00:00:04,2000-01-01 00:00:35";) the output of diesel_dg is zero and can not feed the load4C, why !!? I want to feed the load4C by diesel_dg in islanding...
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