CN111181149B - Micro-grid simulation method and device - Google Patents
Micro-grid simulation method and device Download PDFInfo
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- CN111181149B CN111181149B CN201811242922.8A CN201811242922A CN111181149B CN 111181149 B CN111181149 B CN 111181149B CN 201811242922 A CN201811242922 A CN 201811242922A CN 111181149 B CN111181149 B CN 111181149B
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- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
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Abstract
The embodiment of the invention discloses a micro-grid simulation method and device. The method comprises the following steps: comparing a preset first variable with a first thread variable value and comparing a preset second variable with a second thread variable value every preset system simulation time step; if the first variable is the same as the first thread variable value, triggering the enabling of a power electronic simulation device corresponding to the power electronic device; and if the second variable is the same as the second thread variable value, triggering the fault protection simulation device corresponding to the fault protection device to enable. The microgrid simulation method and device provided by the embodiment of the invention can be used for simulating the power electronic device and the fault protection device of the microgrid in real time, and can improve the simulation efficiency and the simulation effect.
Description
Technical Field
The invention relates to the technical field of simulation, in particular to a micro-grid simulation method and device.
Background
Generally, a microgrid refers to a small-sized power generation and distribution system composed of distributed power sources, energy storage devices, energy conversion devices, loads, fault protection devices, and the like. As shown in fig. 1, fig. 1 shows a schematic block diagram of a microgrid. Wherein the power electronics device in fig. 1 comprises: distributed power supplies, energy storage devices, energy conversion devices and the like. The fault protection device can identify whether the micro-grid fails and realize micro-grid fault location.
The simulation of the microgrid is an important means for improving the safety of the microgrid. The dynamic physical simulation and the real-time digital simulation can directly reflect the performance of the microgrid, belong to an online simulation mode, have the advantages of high precision and being close to the actual test result, but have larger investment and are limited by hardware conditions, the scale of a research object is restricted by a dynamic simulation device, and the parameter adjustment is more complex. The defects of online simulation can be made up through offline simulation, and particularly in the research stage of the protection principle, the correctness of the principle can be quickly and simply verified and a preliminary implementation method can be determined through offline simulation.
At present, a microgrid offline simulation model includes a power electronic simulation device for simulating power electronic devices such as a distributed power supply, an energy storage device, and an energy conversion device, and a fault protection simulation device for simulating a fault protection device. The electromagnetic transient frequency of a power electronic device is typically the switching frequency of the power device; the sampling execution frequency of the fault protection algorithm in the fault protection device is usually realized according to the power frequency. The power frequency is much lower than the switching frequency of the power device.
Disclosure of Invention
When the off-line simulation is actually performed on the microgrid, the applicant finds that the simulation time step lengths of the power electronic simulation device and the fault protection simulation device can only be set to be the same fixed value, so that the electromagnetic transient simulation frequency is the same as the sampling execution simulation frequency of the fault protection algorithm, and different simulation step lengths cannot be set for the power electronic simulation device and the fault protection simulation device. However, the electromagnetic transient simulation frequency is the same as the sampling execution simulation frequency of the fault protection algorithm, which may result in failure to simulate the power electronic device and/or the fault protection device in real time and failure to meet the real-time requirement of simulation. It may also cause a large amount of repetitive calculations in the fault protection simulation apparatus, resulting in low simulation efficiency and poor simulation effect.
The embodiment of the invention provides a micro-grid simulation method and device, which are used for simulating a power electronic device and a fault protection device of a micro-grid in real time and improving simulation efficiency and simulation effect.
In one aspect, an embodiment of the present invention provides a microgrid simulation method, including:
comparing a preset first variable with a first thread variable value and comparing a preset second variable with a second thread variable value every preset system simulation time step; the first variable is a variable related to power electronic device simulation of the micro-grid, the second variable is a variable related to fault protection device simulation of the micro-grid, the first thread variable value is set according to electromagnetic transient frequency and system simulation time step length of the power electronic device, and the second thread variable value is set according to sampling execution frequency and system simulation time step length of the fault protection device;
if the first variable is the same as the first thread variable value, triggering the enabling of a power electronic simulation device corresponding to the power electronic device;
and if the second variable is the same as the second thread variable value, triggering the fault protection simulation device corresponding to the fault protection device to enable.
In an embodiment of the present invention, the microgrid simulation method provided by the embodiment of the present invention further includes:
if the value of the first variable is the same as the value of the first thread variable, setting the value of the first variable as a first preset initial value;
and if the value of the second variable is the same as the value of the second thread variable, setting the value of the second variable as a second preset initial value.
In an embodiment of the present invention, the microgrid simulation method provided by the embodiment of the present invention further includes:
if the value of the first variable is not the same as the value of the first thread variable, accumulating the value of the first variable;
if the value of the second variable is not the same as the value of the second thread variable, the value of the second variable is accumulated.
In an embodiment of the present invention, the microgrid simulation method provided by the embodiment of the present invention further includes:
the first variable and/or the second variable are defined using a common array.
In one embodiment of the invention, the software for simulating the microgrid comprises any one of the following items:
the system comprises an electromagnetic transient program EMTP, a direct current electromagnetic transient program PSCAD/EMTDC, power system analysis software BPA, a power system analysis comprehensive program PSASP and power system simulation software PSS/E.
In an embodiment of the present invention, the microgrid simulation method provided by the embodiment of the present invention further includes:
setting a first thread variable value as the ratio of the time step corresponding to the electromagnetic transient frequency to the system simulation time step;
and setting the second thread variable value as the ratio of the sampling time interval corresponding to the sampling execution frequency to the system simulation time step length.
In another aspect, an embodiment of the present invention provides a microgrid simulation apparatus, including:
the comparison unit is used for comparing a preset first variable with a first thread variable value and comparing a preset second variable with a second thread variable value every preset system simulation time step; the first variable is a variable related to power electronic device simulation of the micro-grid, the second variable is a variable related to fault protection device simulation of the micro-grid, the first thread variable value is set according to electromagnetic transient frequency and system simulation time step length of the power electronic device, and the second thread variable value is set according to sampling execution frequency and system simulation time step length of the fault protection device;
the first enabling unit is used for triggering the power electronic simulation device corresponding to the power electronic device to enable if the first variable is the same as the first thread variable value so as to realize the same function as the power electronic device;
and the second enabling unit is used for triggering the fault protection simulation device corresponding to the fault protection device to enable if the second variable is the same as the second thread variable value so as to realize the same function as the fault protection device.
In an embodiment of the present invention, a microgrid simulation apparatus provided by an embodiment of the present invention further includes:
the first setting unit is used for setting the value of the first variable as a first preset initial value if the value of the first variable is the same as the value of the first thread variable; and if the value of the second variable is the same as the value of the second thread variable, setting the value of the second variable as a second preset initial value.
In an embodiment of the present invention, a microgrid simulation apparatus provided by an embodiment of the present invention further includes:
the accumulation unit is used for accumulating the value of the first variable if the value of the first variable is different from the value of the first thread variable; if the value of the second variable is not the same as the value of the second thread variable, the value of the second variable is accumulated.
In an embodiment of the present invention, a microgrid simulation apparatus provided by an embodiment of the present invention further includes:
a definition unit for defining the first variable and/or the second variable using the common array.
In one embodiment of the invention, the software for simulating the microgrid comprises any one of the following items:
the system comprises an electromagnetic transient program EMTP, a direct current electromagnetic transient program PSCAD/EMTDC, power system analysis software BPA, a power system analysis comprehensive program PSASP and power system simulation software PSS/E.
In an embodiment of the present invention, a microgrid simulation apparatus provided by an embodiment of the present invention further includes:
the second setting unit is used for setting the first thread variable value as the ratio of the time step corresponding to the electromagnetic transient frequency to the system simulation time step; and setting the second thread variable value as the ratio of the sampling time interval corresponding to the sampling execution frequency to the system simulation time step length.
According to the microgrid simulation method and device provided by the embodiment of the invention, a first thread variable value is set according to the electromagnetic transient frequency and the system simulation time step length of a power electronic device of a microgrid, and a second thread variable value is set according to the sampling execution frequency and the system simulation time step length of a fault protection device of the microgrid; when the first variable and the first thread variable are compared to be the same, triggering the power electronic simulation device corresponding to the power electronic device to enable, so that the simulation frequency of the power electronic simulation device is the same as the electromagnetic transient frequency of the power electronic device, and simulating the power electronic device of the microgrid in real time; when the second variable is compared to be the same as the second thread variable value, the fault protection simulation device corresponding to the fault protection device is triggered to enable, so that the simulation frequency of the fault protection simulation device is the same as the sampling execution frequency of the fault protection device, and the fault protection device of the microgrid can be simulated in real time. Therefore, a large amount of repeated calculation does not exist in the fault protection simulation device, and the simulation efficiency and the simulation effect can be improved.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required to be used in the embodiments of the present invention will be briefly described below, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 shows a schematic block diagram of a microgrid;
FIG. 2 is a schematic flow chart illustrating simulation for a power electronic device according to an embodiment of the present invention;
FIG. 3 is a schematic flow chart illustrating a simulation for a fault protection device according to an embodiment of the present invention;
fig. 4 is a schematic flow chart illustrating a microgrid simulation method provided by an embodiment of the present invention;
fig. 5 shows a schematic structural diagram of a microgrid simulation apparatus according to an embodiment of the present invention.
Detailed Description
Features and exemplary embodiments of various aspects of the present invention will be described in detail below, and in order to make objects, technical solutions and advantages of the present invention more apparent, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not to be construed as limiting the invention. It will be apparent to one skilled in the art that the present invention may be practiced without some of these specific details. The following description of the embodiments is merely intended to provide a better understanding of the present invention by illustrating examples of the present invention.
It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
When the existing off-line simulation is carried out on a micro-grid, the simulation time step lengths of a power electronic simulation device and a fault protection simulation device can only be set to be the same fixed value, so that the electromagnetic transient simulation frequency is the same as the sampling execution simulation frequency of a fault protection algorithm, and different simulation step lengths cannot be set for the power electronic simulation device and the fault protection simulation device. However, the operating frequencies of the power electronic device and the fault protection device are often different, the electromagnetic transient frequency of the power electronic device is generally the switching frequency of the power device, and is usually several kilohertz (kHz), while the sampling execution frequency of the fault protection device is generally set according to the power frequency, and the sampling execution frequency is much lower than the electromagnetic transient frequency, and even differs by an order of magnitude. When the electromagnetic transient simulation frequency is the same as the sampling execution simulation frequency of the fault protection algorithm, the power electronic device and/or the fault protection device may not be simulated in real time, and the real-time requirement of simulation may not be satisfied. It may also cause a large amount of repetitive calculations in the fault protection simulation apparatus, resulting in low simulation efficiency and poor simulation effect.
The above problems are explained in detail below by specific examples.
For example, it is assumed that the switching frequency of the power device in the power electronic device is 1kHz, and the electromagnetic transient frequency of the power electronic device is 1kHz, i.e., the one-time switching time of the power device is 1 millisecond (ms). The sampling execution frequency of the fault protection algorithm in the fault protection device is 50Hz, i.e. the sampling time interval is 20 ms.
If the simulation time step lengths of the power electronic simulation device and the fault protection simulation device are set to be the same fixed value, 1ms is assumed. The electromagnetic transient simulation frequency and the sampling execution simulation frequency of the fault protection algorithm are both 1 kHz. For the fault protection simulation device, the sampling execution simulation frequency of the fault protection algorithm may be 50 Hz. The sampling simulation is carried out only at intervals of 20ms, and at the moment, the sampling simulation is carried out at intervals of 1ms, so that a large amount of repeated calculation exists in the fault protection simulation device, the simulation efficiency is low, and the simulation effect is poor.
If the simulation time step lengths of the power electronic simulation device and the fault protection simulation device are set to be the same fixed value, 2ms is assumed. The electromagnetic transient simulation frequency and the sampling execution simulation frequency of the fault protection algorithm are both 500 Hz. For the fault protection simulation device, the sampling execution simulation frequency of the fault protection algorithm may be 50 Hz. The sampling simulation is carried out only at intervals of 20ms, and at the moment, the sampling simulation is carried out at intervals of 2ms, so that a large amount of repeated calculation exists in the fault protection simulation device, the simulation efficiency is low, and the simulation effect is poor. In addition, the power electronic simulation device originally needs 1ms to perform one simulation, and in this case, the power electronic simulation device performs one simulation at an interval of 2ms, which is poor in real-time performance.
If the simulation time step lengths of the power electronic simulation device and the fault protection simulation device are set to be the same fixed value, it is assumed to be 40 ms. The electromagnetic transient simulation frequency and the sampling execution simulation frequency of the fault protection algorithm are both 25 Hz. In the power electronic simulation device, the simulation needs 1ms originally, and in this case, the simulation is performed once at an interval of 40ms, which is poor in real-time performance. For the fault protection simulation device, 20ms is originally needed for sampling simulation, and in this case, sampling simulation is performed once at an interval of 40ms, and the real-time performance is also poor.
In view of the above situation, embodiments of the present invention provide a method and an apparatus for simulating a microgrid, so as to simulate a power electronic device and a fault protection device of the microgrid in real time, and improve simulation efficiency and simulation effect.
First, a power electronic simulation device corresponding to a power electronic device of a microgrid and a fault protection simulation device corresponding to a fault protection device of the microgrid are constructed using simulation software.
In one embodiment of the invention, the simulation software may be any one of the following:
electromagnetic Transient Program (EMTP), Power System Computer Aided Design/direct current electromagnetic Transient Program (PSCAD/EMTDC), Power System Analysis Software BPA, Power System Analysis Software Package (PSASP), and Power System simulation Software (PSS/E).
In an embodiment of the present invention, the simulation software may further be: a software tool PSAPAC developed by the american Power Research Institute (EPRI) capable of fully analyzing static and dynamic performance of an Electric Power system, or an Electric Power system simulation software NETOMAC developed by siemens, germany.
The power electronic simulation device comprises a custom element corresponding to an element used by the power electronic device; the fault protection simulation device includes custom elements corresponding to elements used by the fault protection device.
In one embodiment of the present invention, the custom element may be created by creating a new element "create new component" tag or command in the simulation software, and then setting various properties of the custom element, such as: appearance of the element, number and type of input and output ports of the element, interface call instructions of the element, and the like.
In the present invention, a power electronic simulation device corresponding to a power electronic device of a microgrid and a fault protection simulation device corresponding to a fault protection device of the microgrid may be constructed using known power system simulation software (for example, PSCAD/EMTDC, etc.) and a corresponding modeling method. The basic components and the using method of the simulation software are not described herein.
Secondly, after the power electronic simulation device and the fault protection simulation device are built, a first thread variable value and a second thread variable value can be set.
In one embodiment of the invention, the first thread variable value may be set as a ratio of a time step corresponding to the electromagnetic transient frequency to a system simulation time step; and setting the second thread variable value as the ratio of the sampling time interval corresponding to the sampling execution frequency to the system simulation time step length. So as to realize the real-time simulation of the power electronic device and the fault protection device. In other words, the first thread variable value is set according to the electromagnetic transient frequency of the power electronic device and the system simulation time step, and the second thread variable value is set according to the sampling execution frequency of the fault protection device and the system simulation time step.
After the power electronic simulation device and the fault protection simulation device are built, two variables are defined: a first variable and a second variable.
In one embodiment of the invention, the first and second variables may be defined using a common array of simulation software.
In one embodiment of the invention, the simulation software provides 4 common arrays for storing data, STORF, STORI, STORL and STORC, wherein STORF is used for storing real quantities, STORI is used for storing whole quantities, STORL is used for storing logical quantities, and STORC is used for storing complex quantities.
Embodiments of the present invention preferably utilize STORI to define the first and second variables described above. Illustratively, assume that the first variable is defined as STORI [ NSTORI ], and the second variable is defined as STORI [ NSTORI +1 ].
Before starting the simulation, firstly, a first variable STORI [ NSTORI ] and a second variable STORI [ NSTORI +1] are both assigned with an initial value of 1; the system simulation time step is set, for example, to 1 ms. Assuming that the electromagnetic transient frequency of the power electronic device is 500Hz, the time step corresponding to the electromagnetic transient frequency is 2ms, and the first variable value temp1 is set to 2ms/1ms to 2. Assuming that the sampling execution frequency of the fault protection algorithm in the fault protection device is 50Hz, and the sampling time interval corresponding to the sampling execution frequency of the fault protection device is 20ms, the second thread variable value temp2 is set to 20ms/1 ms.
After the simulation was initiated, STORI [ NSTORI ] and temp1 were compared, and STORI [ NSTORI +1] and temp2 were compared, every 1 ms. When STORI [ NSTORI ] and temp1 are the same, triggering the power electronic simulation device to enable; when STORI [ NSTORI +1] and temp2 are the same, the fail-safe emulation device is triggered to enable.
The simulation process of the microgrid is described in detail below by several milliseconds after the start of the simulation.
1ms after the start of the simulation, STORI [ NSTORI ] ═ 1, STORI [ NSTORI +1] ═ 1, temp1 ═ 2, and temp2 ═ 20. Storri [ NSTORI ] is different from temp1, and storri [ NSTORI +1] is different from temp2, in which case, storri [ NSTORI ] is accumulated, storri [ NSTORI +1] is accumulated, storri [ NSTORI ] is 2, and storri [ NSTORI +1] is 2.
At 2ms after the start of the simulation, STORI [ NSTORI ] ═ 2, STORI [ NSTORI +1] ═ 2, temp1 ═ 2, and temp2 ═ 20. The STORI [ NSTORI ] is the same as temp1, and the STORI [ NSTORI +1] is different from temp2, at this time, the power electronic simulation device is triggered to enable, the STORI [ NSTORI ] is restored to an initial value of 1, the STORI [ NSTORI +1] is accumulated, the STORI [ NSTORI ] is 1, and the STORI [ NSTORI +1] is 3.
At 3ms after the start of the simulation, STORI [ NSTORI ] ═ 1, STORI [ NSTORI +1] ═ 3, temp1 ═ 2, and temp2 ═ 20. Storri [ NSTORI ] is different from temp1, and storri [ NSTORI +1] is different from temp2, in which case, storri [ NSTORI ] is accumulated, storri [ NSTORI +1] is accumulated, storri [ NSTORI ] is 2, and storri [ NSTORI +1] is 4.
At 4ms after the start of the simulation, STORI [ NSTORI ] ═ 2, STORI [ NSTORI +1] ═ 4, temp1 ═ 2, and temp2 ═ 20. The STORI [ NSTORI ] is the same as temp1, and the STORI [ NSTORI +1] is different from temp2, at this time, the power electronic simulation device is triggered to enable, the STORI [ NSTORI ] is restored to an initial value of 1, the STORI [ NSTORI +1] is accumulated, the STORI [ NSTORI ] is equal to 1, and the STORI [ NSTORI +1] is equal to 5.
Similarly, 19ms after the start of the simulation, STORI [ NSTORI ] ═ 1, STORI [ NSTORI +1] ═ 19, temp1 ═ 2, and temp2 ═ 20. Storri [ NSTORI ] is different from temp1, and storri [ NSTORI +1] is different from temp2, in which case, storri [ NSTORI ] is added, storri [ NSTORI +1] is added, storri [ NSTORI ] is 2, and storri [ NSTORI +1] is 20.
At 20ms after the start of the simulation, STORI [ NSTORI ] ═ 2, STORI [ NSTORI +1] ═ 20, temp1 ═ 2, and temp2 ═ 20. STORI [ NSTORI ] is the same as temp1, and STORI [ NSTORI +1] is the same as temp2, and at the moment, the power electronic simulation device is triggered to enable and restore STORI [ NSTORI ] to an initial value of 1; the fail-safe simulation device is triggered to enable and restore STORI NSTORI +1 to the initial value of 1.
At 21ms after the start of the simulation, STORI [ NSTORI ] ═ 1, STORI [ NSTORI +1] ═ 1, temp1 ═ 2, and temp2 ═ 20. Storri [ NSTORI ] is different from temp1, and storri [ NSTORI +1] is different from temp2, in which case, storri [ NSTORI ] is accumulated, storri [ NSTORI +1] is accumulated, storri [ NSTORI ] is 2, and storri [ NSTORI +1] is 2.
At 22ms after the start of the simulation, STORI [ NSTORI ] ═ 2, STORI [ NSTORI +1] ═ 2, temp1 ═ 2, and temp2 ═ 20. The STORI [ NSTORI ] is the same as temp1, and the STORI [ NSTORI +1] is different from temp2, at this time, the power electronic simulation device is triggered to enable, the STORI [ NSTORI ] is restored to an initial value of 1, the STORI [ NSTORI +1] is accumulated, the STORI [ NSTORI ] is 1, and the STORI [ NSTORI +1] is 3.
At 39ms after the start of the simulation, STORI [ NSTORI ] ═ 1, STORI [ NSTORI +1] ═ 19, temp1 ═ 2, and temp2 ═ 20. Storri [ NSTORI ] is different from temp1, and storri [ NSTORI +1] is different from temp2, in which case, storri [ NSTORI ] is added, storri [ NSTORI +1] is added, storri [ NSTORI ] is 2, and storri [ NSTORI +1] is 20.
At 40ms after the start of the simulation, STORI [ NSTORI ] ═ 2, STORI [ NSTORI +1] ═ 20, temp1 ═ 2, and temp2 ═ 20. STORI [ NSTORI ] is the same as temp1, and STORI [ NSTORI +1] is the same as temp2, and at the moment, the power electronic simulation device is triggered to enable and restore STORI [ NSTORI ] to an initial value of 1; the fail-safe simulation device is triggered to enable and restore STORI NSTORI +1 to the initial value of 1.
As can be seen from the above, when the simulation is started for 2ms, 4ms, … …, 20ms, 22ms, … …, and 40ms, the power electronic simulation apparatus is enabled, and the power electronic simulation apparatus is enabled at the same frequency as the electromagnetic transient frequency of the power electronic apparatus, so that the power electronic apparatus can be simulated in real time. And when the simulation is started for 20ms and 40ms, the fault protection simulation device is enabled, the enabling frequency of the fault protection simulation device is the same as the sampling execution frequency of the fault protection device, and the fault protection device can be simulated in real time.
In one embodiment of the invention, the simulation duration may also be set, such as 100 ms. And when the simulation is started for 100ms, ending the simulation, and if the simulation time length does not reach 100ms, continuing the simulation.
By utilizing the embodiment of the invention, the simulation frequency for simulating the power electronic device (namely the enabling frequency of the power electronic simulation device) is the same as the electromagnetic transient frequency, the simulation frequency for simulating the fault protection device (namely the enabling frequency of the fault protection simulation device) is the same as the sampling execution frequency of the fault protection device, the power electronic device and the fault protection device of the microgrid can be simulated in real time, and when the fault protection device is simulated, a large amount of repeated calculation does not exist in the fault protection simulation device, so that the simulation efficiency and the simulation effect can be improved.
Based on the above description, the condition that the power electronic simulation device is enabled is that the value of the first variable is the same as the value of the first thread variable, and therefore, the power electronic simulation device is enabled in relation to the first variable. The power electronic simulation device is a simulation device corresponding to the power electronic device, and therefore the first variable is related to the simulation of the power electronic device. The first variable is referred to herein as a variable associated with power electronics simulation and, correspondingly, the second variable is referred to as a variable associated with fault protection device simulation.
In addition, in an embodiment of the present invention, the functional program corresponding to the custom element may be implemented based on a C language code, and accordingly, the functional program corresponding to the custom element may be stored in a C language source file. For the user-defined element, the simulation software needs to search a corresponding file path to find a corresponding definition segment for identification. Therefore, all the source files used by the custom element must be connected with the simulation project to ensure the normal operation of the custom element in the simulation project.
In an embodiment of the present invention, the association between the Source File corresponding to the custom element and the simulation software may be implemented by using a File Reference element of the simulation software or an edit Source File (Additional Source (.f) files) input box in the project tab.
The flexibility of simulation can be effectively enhanced through the user-defined element, the precision and the reliability of a simulation result are improved, and in addition, the user-defined element has better functionality, transportability and security and confidentiality. In addition, the embodiment of the invention stores and transmits data through the public array, and can avoid memory calling conflict among the user-defined elements caused by using the static variables in the C language.
Based on the above description, the flow of the simulation for the power electronic device is shown in fig. 2.
First, a first variable is initialized, that is, the first variable is assigned with an initial value.
Then, the value of the first thread variable (i.e. the first thread variable value) is set according to the electromagnetic transient frequency of the power electronic device and the system simulation time step.
And comparing the value of the first variable with the value of the first thread variable every system simulation time step.
If the value of the first variable is not the same as the value of the first thread variable, the values of the first variable are accumulated.
And if the value of the first variable is the same as that of the first thread variable, triggering the power electronic simulation device to enable, and then restoring the value of the first variable to the initial value.
If the simulation ending time is up, ending the simulation, and if the simulation ending time is not up, continuing the simulation.
Based on the above description, the flow of the simulation for the fault protection device is shown in fig. 3.
First, the second variable is initialized, that is, the second variable is given an initial value.
Then, the value of the second thread variable (i.e., the second thread variable value) is set according to the sampling execution frequency of the fault protection device and the system simulation time step.
And comparing the value of the second variable with the value of the second thread variable every system simulation time step.
If the value of the second variable is not the same as the value of the second thread variable, the values of the second variable are accumulated.
And if the value of the second variable is the same as that of the second thread variable, triggering the fault protection simulation device to enable, and then restoring the value of the second variable to the initial value.
If the simulation ending time is up, ending the simulation, and if the simulation ending time is not up, continuing the simulation.
Based on the above process, the method for simulating a microgrid according to the embodiment of the present invention can be summarized as the steps shown in fig. 4. Fig. 4 shows a schematic flowchart of a microgrid simulation method provided by an embodiment of the present invention. The microgrid simulation method can comprise the following steps:
s401: and comparing the preset first variable with the first thread variable value and comparing the preset second variable with the second thread variable value every preset system simulation time step.
S402: and if the value of the first variable is the same as the value of the first thread variable, triggering the power electronic simulation device corresponding to the power electronic device to enable.
S403: and if the value of the second variable is the same as the value of the second thread variable, triggering the fault protection simulation device corresponding to the fault protection device to enable.
In an embodiment of the present invention, the microgrid simulation method provided in the embodiment of the present invention may further include: if the value of the first variable is the same as the value of the first thread variable, setting the value of the first variable as a first preset initial value; and if the value of the second variable is the same as the value of the second thread variable, setting the value of the second variable as a second preset initial value.
In an embodiment of the present invention, the microgrid simulation method provided in the embodiment of the present invention may further include: if the value of the first variable is not the same as the value of the first thread variable, accumulating the value of the first variable; if the value of the second variable is not the same as the value of the second thread variable, the value of the second variable is accumulated.
In an embodiment of the present invention, the microgrid simulation method provided in the embodiment of the present invention may further include: the first variable and/or the second variable are defined using a common array of simulation software.
In one embodiment of the invention, the simulation software used for simulating the microgrid comprises any one of the following items:
the system comprises an electromagnetic transient program EMTP, a direct current electromagnetic transient program PSCAD/EMTDC, power system analysis software BPA, a power system analysis comprehensive program PSASP and power system simulation software PSS/E.
In an embodiment of the present invention, the microgrid simulation method provided by the embodiment of the present invention further includes: setting a first thread variable value as the ratio of the time step corresponding to the electromagnetic transient frequency to the system simulation time step; and setting the second thread variable value as the ratio of the sampling time interval corresponding to the sampling execution frequency to the system simulation time step length.
The simulation of the microgrid is described below by taking simulation software as PSCAD/EMTDC as an example.
Firstly, a power electronic simulation device corresponding to a power electronic device of the microgrid and a fault protection simulation device corresponding to a fault protection device of the microgrid are constructed by using PSCAD/EMTDC. The power electronic simulation device comprises a custom element corresponding to an element used by the power electronic device; the fault protection simulation device includes custom elements corresponding to elements used by the fault protection device. The reason for using custom elements is: since the library element of the PSCAD/EMTDC does not have an element enable determination function, elements used by the power electronic device and the fault protection device need to be custom packaged in the PSCAD/EMTDC.
When a power electronic simulation device corresponding to a power electronic device of a microgrid and a fault protection simulation device corresponding to a fault protection device of the microgrid are built by using a PSCAD/EMTDC, a custom element corresponding to an element used by the power electronic device and a custom element corresponding to an element used by the fault protection device are created through a new element creation new component label or command in the PSCAD/EMTDC, and then various attributes of the custom element are set, such as: appearance of the element, number and type of input and output ports of the element, interface call instructions of the element, and the like.
And establishing an incidence relation between the self-defining element and a C Source File for realizing the function of the self-defining element by using a File Reference element of the PSCAD/EMTDC or an input box of an editing Source File (Additional Source (f) files) in an engineering option card so as to call during simulation.
Two variables are then defined using a common array of PSCAD/EMTDC: a first variable STORI NSTORI related to power electronic device simulation and a second variable STORI NSTORI +1 related to fault protection device simulation. And an initial value of 1 is assigned to both the first variable STORI [ NSTORI ] and the second variable STORI [ NSTORI +1 ].
And setting a system simulation time step, setting a first thread variable value temp1 as the ratio of the time step corresponding to the electromagnetic transient frequency to the system simulation time step, and setting a second thread variable value temp2 as the ratio of the sampling time interval corresponding to the sampling execution frequency to the system simulation time step.
After the simulation is initiated, the first variable STORI [ NSTORI ] and temp1 are compared, and the second variable STORI [ NSTORI +1] and temp2 are compared, every system simulation time step.
If the first variable STORI [ NSTORI ] is different from temp1, the value of the first variable STORI [ NSTORI ] is added with 1, and if the first variable STORI [ NSTORI ] is the same as temp1, the power electronic simulation device is triggered to enable, the C source file is called to execute the functional program, and then the value of the STORI [ NSTORI ] is restored to the initial value of 1.
If the second variable STORI [ NSTORI +1] and temp2 are not the same, the value of the second variable STORI [ NSTORI +1] is added with 1, and if the second variable STORI [ NSTORI +1] and temp2 are the same, the fault protection simulation device is triggered to enable, the C source file is called to execute the functional program, and then the value of the STORI [ NSTORI +1] is restored to the initial value of 1.
The power electronic simulation device enables the first variable STORI [ NSTORI ] and temp1 to be the same, so that the enabling frequency of the power electronic simulation device is the same as the electromagnetic transient frequency of the power electronic device, and the power electronic device can be simulated in real time. The fault protection simulation device enables the second variable STORI [ NSTORI +1] and temp2 when the second variable STORI [ NSTORI +1] and the second variable temp2 are the same, so that the enabling frequency of the fault protection simulation device is the same as the sampling execution frequency of the fault protection device, and the fault protection device can be simulated in real time.
And furthermore, the simulation result can be output and recorded by the wave recording element according to the electric quantity to be observed so as to be checked and analyzed.
According to the microgrid simulation method provided by the embodiment of the invention, a first thread variable value is set according to the electromagnetic transient frequency and the system simulation time step length of a power electronic device of a microgrid, and a second thread variable value is set according to the sampling execution frequency and the system simulation time step length of a fault protection device of the microgrid; when the first variable and the first thread variable are compared to be the same, triggering the power electronic simulation device corresponding to the power electronic device to enable, so that the simulation frequency of the power electronic simulation device is the same as the electromagnetic transient frequency of the power electronic device, and simulating the power electronic device of the microgrid in real time; when the second variable is compared to be the same as the second thread variable value, the fault protection simulation device corresponding to the fault protection device is triggered to enable, so that the simulation frequency of the fault protection simulation device is the same as the sampling execution frequency of the fault protection device, and the fault protection device of the microgrid can be simulated in real time. Therefore, a large amount of repeated calculation does not exist in the fault protection simulation device, and the simulation efficiency and the simulation effect can be improved
Corresponding to the above method embodiment, the embodiment of the present invention further provides a micro grid simulation apparatus. As shown in fig. 5, fig. 5 is a schematic structural diagram of a microgrid simulation apparatus according to an embodiment of the present invention. The microgrid simulation apparatus may include:
a comparing unit 501, configured to compare a preset first variable with a first thread variable value and compare a preset second variable with a second thread variable value every predetermined system simulation time step; the first variable is a variable related to power electronic device simulation of the microgrid, the second variable is a variable related to fault protection device simulation of the microgrid, the first thread variable value is set according to electromagnetic transient frequency and system simulation time step of the power electronic device, and the second thread variable value is set according to sampling execution frequency and system simulation time step of the fault protection device.
The first enabling unit 502 is configured to trigger enabling of the power electronic simulation device corresponding to the power electronic device if the first variable is the same as the first thread variable value.
And a second enabling unit 503, configured to trigger enabling of the fault protection simulation device corresponding to the fault protection device if the second variable is the same as the second thread variable value.
In an embodiment of the present invention, the microgrid simulation apparatus provided by the embodiment of the present invention may further include: the first setting unit is used for setting the value of the first variable as a first preset initial value if the value of the first variable is the same as the value of the first thread variable; and if the value of the second variable is the same as the value of the second thread variable, setting the value of the second variable as a second preset initial value.
In an embodiment of the present invention, the microgrid simulation apparatus provided by the embodiment of the present invention may further include: the accumulation unit is used for accumulating the value of the first variable if the value of the first variable is different from the value of the first thread variable; if the value of the second variable is not the same as the value of the second thread variable, the value of the second variable is accumulated.
In an embodiment of the present invention, the microgrid simulation apparatus provided by the embodiment of the present invention may further include: a definition unit for defining the first variable and/or the second variable using a common array of the simulation software.
In one embodiment of the invention, the simulation software used for simulating the microgrid comprises any one of the following items:
the system comprises an electromagnetic transient program EMTP, a direct current electromagnetic transient program PSCAD/EMTDC, power system analysis software BPA, a power system analysis comprehensive program PSASP and power system simulation software PSS/E.
In an embodiment of the present invention, the microgrid simulation apparatus provided by the embodiment of the present invention may further include: the second setting unit is used for setting the first thread variable value as the ratio of the time step corresponding to the electromagnetic transient frequency to the system simulation time step; and setting the second thread variable value as the ratio of the sampling time interval corresponding to the sampling execution frequency to the system simulation time step length.
According to the microgrid simulation device provided by the embodiment of the invention, a first thread variable value is set according to the electromagnetic transient frequency and the system simulation time step length of a power electronic device of a microgrid, and a second thread variable value is set according to the sampling execution frequency and the system simulation time step length of a fault protection device of the microgrid; when the first variable and the first thread variable are compared to be the same, triggering the power electronic simulation device corresponding to the power electronic device to enable, so that the simulation frequency of the power electronic simulation device is the same as the electromagnetic transient frequency of the power electronic device, and simulating the power electronic device of the microgrid in real time; when the second variable is compared to be the same as the second thread variable value, the fault protection simulation device corresponding to the fault protection device is triggered to enable, so that the simulation frequency of the fault protection simulation device is the same as the sampling execution frequency of the fault protection device, and the fault protection device of the microgrid can be simulated in real time. Therefore, a large amount of repeated calculation does not exist in the fault protection simulation device, and the simulation efficiency and the simulation effect can be improved.
It is to be understood that the invention is not limited to the specific arrangements and instrumentality described above and shown in the drawings. A detailed description of known methods is omitted herein for the sake of brevity. In the above embodiments, several specific steps are described and shown as examples. However, the method processes of the present invention are not limited to the specific steps described and illustrated, and those skilled in the art can make various changes, modifications and additions or change the order between the steps after comprehending the spirit of the present invention.
The functional blocks shown in the above-described structural block diagrams may be implemented as hardware, software, firmware, or a combination thereof. When implemented in hardware, it may be, for example, an electronic circuit, an Application Specific Integrated Circuit (ASIC), suitable firmware, plug-in, function card, or the like. When implemented in software, the elements of the invention are the programs or code segments used to perform the required tasks. The program or code segments may be stored in a machine-readable medium or transmitted by a data signal carried in a carrier wave over a transmission medium or a communication link. A "machine-readable medium" may include any medium that can store or transfer information. Examples of a machine-readable medium include electronic circuits, semiconductor memory devices, ROM, flash memory, Erasable ROM (EROM), floppy disks, CD-ROMs, optical disks, hard disks, fiber optic media, Radio Frequency (RF) links, and so forth. The code segments may be downloaded via computer networks such as the internet, intranet, etc.
It should also be noted that the exemplary embodiments mentioned in this patent describe some methods or systems based on a series of steps or devices. However, the present invention is not limited to the order of the above-described steps, that is, the steps may be performed in the order mentioned in the embodiments, may be performed in an order different from the order in the embodiments, or may be performed simultaneously.
As described above, only the specific embodiments of the present invention are provided, and it can be clearly understood by those skilled in the art that, for convenience and brevity of description, the specific working processes of the system, the module and the unit described above may refer to the corresponding processes in the foregoing method embodiments, and are not described herein again. It should be understood that the scope of the present invention is not limited thereto, and any person skilled in the art can easily conceive various equivalent modifications or substitutions within the technical scope of the present invention, and these modifications or substitutions should be covered within the scope of the present invention.
Claims (10)
1. A microgrid simulation method, characterized in that the method comprises:
comparing a preset first variable with a first thread variable value and comparing a preset second variable with a second thread variable value every preset system simulation time step; the first variable is a variable related to power electronic device simulation of a microgrid, the second variable is a variable related to fault protection device simulation of the microgrid, the first thread variable value is set according to electromagnetic transient frequency of the power electronic device and the system simulation time step, and the second thread variable value is set according to sampling execution frequency of the fault protection device and the system simulation time step;
if the first variable is the same as the first thread variable value, triggering the enabling of a power electronic simulation device corresponding to the power electronic device;
if the second variable is the same as the second thread variable value, triggering a fault protection simulation device corresponding to the fault protection device to enable;
if the value of the first variable is the same as the value of the first thread variable, setting the value of the first variable as a first preset initial value;
and if the value of the second variable is the same as the value of the second thread variable, setting the value of the second variable as a second preset initial value.
2. The method of claim 1, further comprising:
if the value of the first variable is different from the value of the first thread variable, accumulating the value of the first variable;
and if the value of the second variable is different from the value of the second thread variable, accumulating the value of the second variable.
3. The method of claim 1, further comprising:
defining the first variable and/or the second variable using a common array.
4. The method of claim 1, wherein the software that simulates the microgrid comprises any one of:
the system comprises an electromagnetic transient program EMTP, a direct current electromagnetic transient program PSCAD/EMTDC, power system analysis software BPA, a power system analysis comprehensive program PSASP and power system simulation software PSS/E.
5. The method of claim 1, further comprising:
setting the first thread variable value as the ratio of the time step corresponding to the electromagnetic transient frequency to the system simulation time step;
and setting the second thread variable value as the ratio of the sampling time interval corresponding to the sampling execution frequency to the system simulation time step length.
6. A microgrid emulation apparatus, characterized in that the apparatus comprises:
the comparison unit is used for comparing a preset first variable with a first thread variable value and comparing a preset second variable with a second thread variable value every preset system simulation time step; the first variable is a variable related to power electronic device simulation of a microgrid, the second variable is a variable related to fault protection device simulation of the microgrid, the first thread variable value is set according to electromagnetic transient frequency of the power electronic device and the system simulation time step, and the second thread variable value is set according to sampling execution frequency of the fault protection device and the system simulation time step;
the first enabling unit is used for triggering the enabling of the power electronic simulation device corresponding to the power electronic device if the first variable is the same as the first thread variable value;
the second enabling unit is used for triggering the fault protection simulation device corresponding to the fault protection device to enable if the second variable is the same as the second thread variable value;
the device further comprises:
a first setting unit, configured to set a value of the first variable as a first preset initial value if the value of the first variable is the same as the first thread variable value; and if the value of the second variable is the same as the value of the second thread variable, setting the value of the second variable as a second preset initial value.
7. The apparatus of claim 6, further comprising:
the accumulation unit is used for accumulating the value of the first variable if the value of the first variable is different from the value of the first thread variable; and if the value of the second variable is different from the value of the second thread variable, accumulating the value of the second variable.
8. The apparatus of claim 6, further comprising:
a definition unit for defining the first variable and/or the second variable using a common array of simulation software.
9. The apparatus of claim 6, wherein the software that simulates the microgrid comprises any one of:
the system comprises an electromagnetic transient program EMTP, a direct current electromagnetic transient program PSCAD/EMTDC, power system analysis software BPA, a power system analysis comprehensive program PSASP and power system simulation software PSS/E.
10. The apparatus of claim 6, further comprising:
the second setting unit is used for setting the first thread variable value as the ratio of the time step corresponding to the electromagnetic transient frequency to the system simulation time step; and setting the second thread variable value as the ratio of the sampling time interval corresponding to the sampling execution frequency to the system simulation time step length.
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