CN110632532B - Test system and method for meeting parallel operation of multiple groups of serial photovoltaic inverters - Google Patents
Test system and method for meeting parallel operation of multiple groups of serial photovoltaic inverters Download PDFInfo
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Abstract
The invention provides a test system and a test method for meeting parallel operation of a plurality of groups of series photovoltaic inverters, wherein the test system comprises the following steps: the power amplifier is used for simulating a power grid; the semi-physical simulation platform is used for: simulating the access of the tested equipment to a power grid based on the current of the tested equipment, and collecting the three-phase grid-connected voltage of an access node; generating a control instruction based on the three-phase grid-connected voltage of the access node, and transmitting the control instruction to the power amplifier; the power amplifier is configured to: and controlling the current and the voltage of the tested equipment accessed to the power amplifier based on the control instruction to generate a test result. According to the technical scheme provided by the invention, any power grid voltage and line impedance can be changed and simulated in real time through the semi-physical simulation platform, and the power is output through the power amplifier, so that the power grid simulation test device is more flexible in arrangement and universal than the conventional power grid simulation test device.
Description
Technical Field
The invention relates to parallel operation of photovoltaic inverters, in particular to a test system and a test method for meeting parallel operation of multiple groups of series photovoltaic inverters.
Background
In the field of photovoltaic grid-connected performance detection, national solar research laboratories are established in Europe and America in multiple countries, solar photovoltaic power generation technology and corresponding detection technology research are developed, and in addition, world-known test and authentication centers such as the U.S. UL safety test institute, the Germany TuV technical supervision institute, the Germany institute of Electrical Engineers (VDE) and the like are established or have some world-level photovoltaic power generation system test laboratories in a combined establishment mode. At present, all laboratories can carry out tests on various types of photovoltaic inverters and provide authoritative certification of components and parts, but a test system which comprehensively considers influence factors such as shadow shielding, inconsistent alternating current side line impedance, power grid background harmonic waves and the like and meets real operating conditions of a plurality of groups of series inverters is not established. At present, a test system which meets the parallel operation of a plurality of groups of series type photovoltaic inverters does not exist in a laboratory.
In summary, the prior art lacks a test for the parallel operation characteristics of multiple series inverters.
Disclosure of Invention
In order to overcome the above defects, the present invention provides a testing system for meeting the parallel operation of a plurality of groups of string-type photovoltaic inverters, comprising: a semi-physical simulation platform and a power amplifier;
the semi-physical simulation platform is used for: simulating the tested equipment to be connected to a power grid based on the current of the tested equipment, and acquiring three-phase grid-connected voltage of an access node; generating a control instruction based on the three-phase grid-connected voltage of the access node, and transmitting the control instruction to the power amplifier;
the power amplifier is configured to: and controlling the current and the voltage of the tested equipment accessed to the power amplifier based on the control instruction to generate a test result.
Preferably, the test system further comprises: the analog quantity output board card, the analog quantity input board card and the signal conditioning circuit;
the analog input board card is used for: connecting the current of the tested equipment reduced by the signal conditioning circuit to a semi-physical simulation platform;
the analog output board card is used for: and sending the control instruction output by the semi-physical simulation platform to the power amplifier.
Preferably, the semi-physical simulation platform includes: the device comprises a first signal conditioning module, a second signal conditioning module and a simulation module;
the first signal conditioning module is configured to: reducing the three-phase grid-connected voltage of the power grid access node, generating a control instruction and sending the control instruction to the analog quantity output board card;
the second signal conditioning module is configured to: restoring the current of the tested equipment accessed through the analog quantity input board card and then sending the restored current to the simulation module;
the simulation module is used for: generating a controlled current source according to the current of the accessed tested equipment, and accessing the controlled current source into a power grid; and acquiring the three-phase grid-connected voltage of the access node and sending the three-phase grid-connected voltage to the first signal conditioning module.
Preferably, the power amplifier includes: a main circuit module and a control module;
the main circuit module is used for: sending the received current and voltage of the tested device to the control module; outputting a test result based on the PWM signal generated by the control module;
the control module is used for: and generating a PWM signal through control comparison based on the control instruction and the current and the voltage of the tested equipment, and sending the PWM signal to a main circuit module.
Preferably, the main circuit module includes: three single-phase full-bridge circuits;
the three single-phase full-bridge circuits are used for: and generating a test result by the PWM signal transmitted by the control module.
Preferably, the control module includes: the device comprises an amplification module, a PI double-loop control module and a repetition control module;
the amplification module is connected with the PI double-ring control module in series;
the amplification module is used for: amplifying the command signal transmitted by the semi-physical simulation platform to obtain a voltage signal consistent with the phase of the three-phase voltage of the power grid node;
the PI double-loop control module is formed by connecting a first PI control circuit and a second PI control circuit in series;
the repetitive control module is connected in parallel with the first PI control circuit.
A test method for meeting parallel operation of a plurality of groups of string-type photovoltaic inverters is characterized by comprising the following steps:
the semi-physical simulation platform simulates the tested equipment to be connected into a power grid according to the current of the tested equipment and acquires three-phase grid-connected voltage of an access node;
the semi-physical simulation platform generates a control instruction based on the three-phase grid-connected voltage of the access node and transmits the control instruction to the power amplifier;
and the power amplifier controls the power amplifier based on the control instruction and the current and voltage of the tested equipment accessed to the power amplifier to generate a test result.
Preferably, the semi-physical simulation platform simulates the device to be tested to access the power grid according to the current of the device to be tested, and acquires the three-phase grid-connected voltage of an access node, and includes:
the simulation module of the semi-physical simulation platform simulates the current i of the tested equipment and the current i of the access node of the tested equipment when the tested equipment is accessed to the power grid am 、i bm 、i cm The consistency is achieved;
and a simulation module of the semi-physical simulation platform acquires the three-phase grid-connected voltage of the access node.
Preferably, the simulation module of the semi-physical simulation platform simulates the tested device to be connected to the power grid, and the current of the connection node is the current i of the tested device am 、i bm 、i cm And (3) uniformly comprising:
the signal analog circuit of the semi-physical simulation platform is connected withCurrent i of the device under test am 、i bm 、i cm Is reduced to obtain i am1 、i bm1 、i cm1 ；
The reduced current i is input by an analog input board card of the semi-physical simulation platform am1 、i bm1 、i cm1 Amplifying the current i of the tested equipment by a second signal conditioning module of the semi-physical simulation platform am 、i bm 、i cm Currents with consistent magnitude and phase;
simulation module of semi-physical simulation platform and current i of tested device am 、i bm 、i cm The currents with the same magnitude and phase are connected into a power grid.
Preferably, the semi-physical simulation platform generates a control instruction based on the adjusted three-phase grid-connected voltage of the grid access node, and transmits the control instruction to the power amplifier, and the method includes:
the simulation module of the semi-physical simulation platform enables the three-phase grid-connected voltage u of the access node a0 、u b0 、u c0 The first signal conditioning module is sent to the semi-physical simulation platform;
the first signal conditioning module is used for conditioning the three-phase voltage u a0 、u b0 、u c0 Is reduced to u a1 、u b1 、u c1 And sending the data to an output board card of the semi-physical simulation platform;
the output board card is used for reducing the reduced voltage u a1 、u b1 、u c1 And sending the control command to the power amplifier.
Preferably, the power amplifier controls the power amplifier based on the control command, and the current and voltage of the device under test connected to the power amplifier, and generates a test result, including:
the control module of the power amplifier obtains an error signal through a control algorithm according to the control instruction and the current and voltage of the tested equipment accessed to the power amplifier, and the control module processes the error signal through PI double-loop control and repeated control to obtain a PWM signal;
the control module sends the PWM signal to a main circuit module of the power amplifier;
and the main circuit module generates a test result according to the PWM signal, wherein the test result is a oscillogram.
Preferably, the control algorithm comprises:
the control module is used for multiplying the control instruction to obtain a first signal consistent with the three-phase voltage of the power grid node in magnitude and phase;
and the control module calculates a difference value between the first signal and the feedback signal to obtain the error signal.
Compared with the closest prior art, the technical scheme provided by the invention has the following beneficial effects:
the invention provides a test system and a test method for meeting parallel operation of a plurality of groups of serial photovoltaic inverters, wherein the test system comprises the following steps: a semi-physical simulation platform and a power amplifier; the semi-physical simulation platform is used for: simulating the tested equipment to be connected to a power grid based on the current of the tested equipment, and acquiring three-phase grid-connected voltage of an access node; generating a control instruction based on the three-phase grid-connected voltage of the access node, and transmitting the control instruction to the power amplifier; the power amplifier is configured to: and controlling the current and the voltage of the tested equipment accessed to the power amplifier based on the control instruction to generate a test result. The semi-physical simulation platform can change and simulate any power grid voltage and line impedance in real time, and the power is output through the power amplifier, so that the device is more flexible in arrangement and has universality compared with the conventional simulated power grid testing device;
according to the technical scheme provided by the invention, the power amplifier in the test system utilizes SiC power module devices and adopts a multi-tube parallel frequency multiplication technology, the highest switching frequency can reach 400kHz, microsecond-level response speed can be realized by synchronously triggering output and dead zone compensation in the driving control of the power device, compared with the existing power electronic power amplifier, the power electronic power amplifier can more accurately track instruction signals, and compared with a linear power amplifier, the power electronic power amplifier has larger rated capacity and lower cost;
according to the technical scheme provided by the invention, a control strategy that a PI controller and a repetitive controller are combined is adopted by a control part of the power amplifier in the test system, the PI controller has stronger robustness and dynamic response speed, and the repetitive control has strong suppression effect on harmonic waves;
according to the technical scheme provided by the invention, the voltage of the access point of the tested equipment of the power grid model and the grid-connected current of the tested equipment form closed-loop feedback, the voltage output of the node voltage of the power grid can be changed in real time according to the response of the tested equipment, the field environment can be simulated more truly, and the test on the tested equipment is more accurate.
Drawings
Fig. 1 is a schematic structural diagram of a test system for meeting parallel operation of multiple groups of string-type photovoltaic inverters provided by the present invention;
Detailed Description
The invention is described in further detail below with reference to the accompanying drawings:
the first embodiment,
Fig. 1 is a schematic structural diagram of a test system for meeting parallel operation of multiple groups of string-type photovoltaic inverters, as shown in fig. 1, the test system for meeting parallel operation of multiple groups of string-type photovoltaic inverters provided by the present invention includes: a semi-physical simulation platform and a power amplifier;
the semi-physical simulation platform is used for: simulating the tested equipment to be connected to a power grid based on the current of the tested equipment, and acquiring three-phase grid-connected voltage of an access node; generating a control instruction based on the three-phase grid-connected voltage of the access node, and transmitting the control instruction to the power amplifier;
the power amplifier is configured to: and controlling the current and the voltage of the tested equipment accessed to the power amplifier based on the control instruction to generate a test result.
The test system further comprises: the analog quantity output board card, the analog quantity input board card and the signal conditioning circuit are connected with the analog quantity output board card;
the analog input board card is used for: connecting the current of the tested equipment which is reduced by the signal conditioning circuit into a semi-physical simulation platform;
the analog output board card is used for: and sending the control instruction output by the semi-physical simulation platform to the power amplifier.
The semi-physical simulation platform comprises: the device comprises a first signal conditioning module, a second signal conditioning module and a simulation module;
the first signal conditioning module is configured to: reducing the three-phase grid-connected voltage of the power grid access node, generating a control instruction and sending the control instruction to the analog quantity output board card;
the second signal conditioning module is configured to: restoring the current of the tested equipment accessed through the analog input board card and then sending the restored current to the simulation module;
the simulation module is used for: generating a controlled current source according to the current of the accessed tested equipment, and accessing the controlled current source into a power grid; and acquiring the three-phase grid-connected voltage of the access node and sending the three-phase grid-connected voltage to the first signal conditioning module.
The power amplifier includes: a main circuit module and a control module;
the main circuit module is used for: sending the received current and voltage of the tested device to the control module; outputting a test result based on the PWM signal generated by the control module;
the control module is used for: and generating a PWM signal through control comparison based on the control instruction and the current and the voltage of the tested equipment, and sending the PWM signal to a main circuit module.
The main circuit module includes: three single-phase full-bridge circuits;
the three single-phase full-bridge circuits are used for: and generating a test result by the PWM signal transmitted by the control module.
The control module includes: the device comprises an amplification module, a PI double-loop control module and a repetition control module;
the amplification module is connected with the PI double-ring control module in series;
the amplification module is used for: amplifying the command signal transmitted by the semi-physical simulation platform to obtain a voltage signal consistent with the three-phase voltage phase of the power grid node;
the PI double-loop control module is formed by connecting a first PI control circuit and a second PI control circuit in series;
the repetitive control module is connected in parallel with the first PI control circuit.
Example II,
Based on the same inventive concept, the invention also provides a test method for meeting the parallel operation of a plurality of groups of series-type photovoltaic inverters, which comprises the following steps:
the semi-physical simulation platform shown in fig. 1 simulates the tested equipment to be accessed to a power grid according to the current of the tested equipment, and acquires the three-phase grid-connected voltage of an access node;
the semi-physical simulation platform generates a control instruction based on the three-phase grid-connected voltage of the access node and transmits the control instruction to the power amplifier;
and the power amplifier controls the power amplifier based on the control instruction and the current and voltage of the tested equipment accessed to the power amplifier to generate a test result.
The semi-physical simulation platform simulates the tested equipment to be accessed to a power grid according to the current of the tested equipment and acquires the three-phase grid-connected voltage of an access node, and comprises the following steps:
the simulation module of the semi-physical simulation platform simulates the current i of the tested equipment and the current i of the access node of the tested equipment when the tested equipment is accessed to the power grid am 、i bm 、i cm Consistency;
and a simulation module of the semi-physical simulation platform acquires the three-phase grid-connected voltage of the access node.
The simulation module of the semi-physical simulation platform simulates the tested equipment to be connected into a power grid, and the current of the connection node is the current i of the tested equipment am 、i bm 、i cm And (3) uniformly comprising:
current i of tested equipment to be accessed by signal analog circuit of semi-physical simulation platform am 、i bm 、i cm Is reduced to obtain i am1 、i bm1 、i cm1 ；
The reduced current i is input by an analog input board card of the semi-physical simulation platform am1 、i bm1 、i cm1 Amplifying the current i of the tested equipment by a second signal conditioning module of the semi-physical simulation platform am 、i bm 、i cm Currents with consistent magnitude and phase;
simulation module of semi-physical simulation platform and current i of tested device am 、i bm 、i cm The currents with the same magnitude and phase are connected into a power grid.
The semi-physical simulation platform generates a control instruction based on the adjusted three-phase grid-connected voltage of the power grid access node, and transmits the control instruction to the power amplifier, and the method comprises the following steps:
the simulation module of the semi-physical simulation platform enables the three-phase grid-connected voltage u of the access node a0 、u b0 、u c0 The first signal conditioning module is sent to the semi-physical simulation platform;
the first signal conditioning module is used for conditioning the three-phase voltage u a0 、u b0 、u c0 Is reduced to u a1 、u b1 、u c1 And sending the data to an output board card of the semi-physical simulation platform;
the output board card is used for reducing the reduced voltage u a1 、u b1 、u c1 And sending the control command to the power amplifier.
The power amplifier controls the current and the voltage of the tested equipment accessed to the power amplifier based on the control instruction to generate a test result, and the method comprises the following steps:
the control module of the power amplifier obtains an error signal through a control algorithm according to the control instruction and the current and voltage of the tested equipment accessed to the power amplifier, and the control module processes the error signal through PI double-loop control and repeated control to obtain a PWM signal;
the control module sends the PWM signal to a main circuit module of the power amplifier;
and the main circuit module generates a test result according to the PWM signal, wherein the test result is a oscillogram.
The control algorithm comprises the following steps:
the control module is used for multiplying the control instruction to obtain a first signal consistent with the three-phase voltage of the power grid node in phase;
and the control module calculates a difference value between the first signal and the feedback signal to obtain the error signal.
Example III,
The invention provides a test system for meeting parallel operation of a plurality of groups of series photovoltaic inverters, which comprises the following steps:
the test system consists of a semi-physical simulation platform, a power amplifier, tested equipment and an analog direct current source, and the structure of the test system is shown in figure 1.
A test system for satisfying parallel operation of multiple groups of string-type photovoltaic inverters, comprising: the power amplifier is used for simulating a power grid;
the semi-physical simulation platform comprises: the simulation module simulates a power grid side test environment;
the simulation module of the semi-physical simulation platform is used for: collecting three-phase grid-connected current of a node of a power grid accessed to the semi-physical simulation platform, and generating a control instruction; and outputting a control instruction to the tested device through the power amplifier;
the control command is a voltage command.
The semi-physical simulation platform comprises a simulation module, an analog output board card, an analog input board card and a signal conditioning circuit. The simulation module represents a test environment of a power grid side and comprises a power grid model, a line impedance model, a power generation device and load model connected into the power grid, and a three-phase controlled current source model. Wherein the three-phase controlled current source model represents the tested equipment, the access point is the power grid node M, and the three-phase voltage u of the power grid node M is sampled a0 、u b0 、u c0 Is converted into a signal u of-16V to 16V by reducing k times through the signal conditioning module 1 a1 、u b1 、u c1 And output to the power amplifier through the analog output board card as workA rate amplifier control command.
The power amplifier includes a main circuit portion and a control portion. The main circuit part comprises three single-phase full-bridge inverter circuit, and single-phase full-bridge inverter circuit includes contravariant full-bridge and LC filter circuit, and contravariant full-bridge application SiC power module device adopts the parallelly connected doubling of frequency technique of multitube, and the highest switching frequency can reach 400kHz, and power module device drive control can realize microsecond level response speed through synchronous trigger output and blind spot compensation. The power amplifier receives the control instruction u a1 、u b1 、u c1 Then, the output voltage u of the main circuit of the power amplifier is controlled by the control algorithm of the control part a 、u b 、u c . The control algorithm is specifically as follows: sampling power amplifier main circuit output voltage u a 、u b 、u c And a current i flowing through an inductance L of the LC filter circuit a 、i b 、i c Control command u via an amplifier a1 、u b1 、u c1 K times is enlarged to obtain a signal u with the size and the phase consistent with the three-phase voltage of the power grid node M a0 、u b0 、u c0 Calculating u a0 、u b0 、u c0 With the output voltage u of the main circuit of the power amplifier being sampled a 、u b 、u c The error signal is subjected to PI double-loop control and repeated control to obtain a PWM signal: the PWMA, PWMB and PWMC drive three single-phase full-bridge circuits to work.
The tested equipment is a group string type photovoltaic inverter with a single machine or a plurality of machines connected in parallel, and the current flowing to the power amplifier of the tested equipment is the grid-connected current i of the tested equipment am 、i bm 、i cm Grid-connected current i am 、i bm 、i cm Reduced to i by the signal conditioning circuit in the semi-physical simulation platform am1 、i bm1 、i cm1 In the range of-16A to 16A am1 、i bm1 、i cm1 The analog quantity input board card is input into the simulation module, and the analog quantity input board card is changed into a signal with the same size and phase as the controlled signal of the three-phase controlled current source connected to the power grid node M in the simulation module through the signal conditioning module 2.
The simulation module parameters are modified, various testing working conditions are manufactured by changing the voltage of the power grid node M, and the grid-connected performance tests such as low voltage ride through (including zero voltage ride through), high voltage ride through, power grid adaptability, power control, electric energy quality and the like can be carried out aiming at the tested equipment.
As will be appreciated by one skilled in the art, embodiments of the present application may be provided as a method, system, or computer program product. Accordingly, the present application may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present application may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
The present application is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the application. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
Finally, it should be noted that: although the present application has been described in detail with reference to the above embodiments, it should be understood by those skilled in the art that: numerous variations, modifications, and equivalents will occur to those skilled in the art upon reading the present application and are within the scope of the claims appended hereto.
Claims (8)
1. A test system for meeting parallel operation of a plurality of groups of string-type photovoltaic inverters is characterized by comprising: a semi-physical simulation platform and a power amplifier;
the semi-physical simulation platform is used for: simulating the access of the tested equipment to a power grid based on the current of the tested equipment, and collecting the three-phase grid-connected voltage of an access node; generating a control instruction based on the three-phase grid-connected voltage of the access node, and transmitting the control instruction to the power amplifier;
the power amplifier is configured to: controlling the current and the voltage of the tested equipment accessed to the power amplifier based on the control instruction to generate a test result;
the power amplifier includes: the main circuit module and the control module;
the main circuit module is used for: sending the received current and voltage of the tested device to the control module; outputting a test result based on the PWM signal generated by the control module;
the control module is used for: generating PWM signals through control comparison based on the control commands and the current and the voltage of the tested equipment, and sending the PWM signals to a main circuit module;
the main circuit module includes: three single-phase full-bridge circuits;
the three single-phase full-bridge circuits are used for: and generating a test result by the PWM signal transmitted by the control module.
The control module includes: the device comprises an amplification module, a PI double-loop control module and a repetition control module;
the amplification module is connected with the PI double-ring control module in series;
the amplification module is used for: amplifying the command signal transmitted by the semi-physical simulation platform to obtain a voltage signal consistent with the three-phase voltage phase of the power grid node;
the PI double-loop control module is formed by connecting a first PI control circuit and a second PI control circuit in series;
the repetitive control module is connected in parallel with the first PI control circuit.
2. The test system of claim 1, wherein the test system further comprises: the analog quantity output board card, the analog quantity input board card and the signal conditioning circuit are connected with the analog quantity output board card;
the analog input board card is used for: connecting the current of the tested equipment which is reduced by the signal conditioning circuit into a semi-physical simulation platform;
the analog output board card is used for: and sending the control instruction output by the semi-physical simulation platform to the power amplifier.
3. The test system of claim 2, wherein the semi-physical simulation platform comprises: the device comprises a first signal conditioning module, a second signal conditioning module and a simulation module;
the first signal conditioning module is configured to: reducing the three-phase grid-connected voltage of the power grid access node, generating a control instruction and sending the control instruction to the analog quantity output board card;
the second signal conditioning module is configured to: restoring the current of the tested equipment accessed through the analog input board card and then sending the restored current to the simulation module;
the simulation module is used for: generating a controlled current source according to the current of the accessed tested equipment, and accessing the controlled current source into a power grid; and acquiring the three-phase grid-connected voltage of the access node and sending the three-phase grid-connected voltage to the first signal conditioning module.
4. A test method for meeting parallel operation of a plurality of groups of string-type photovoltaic inverters is characterized by comprising the following steps:
the semi-physical simulation platform simulates the tested equipment to be accessed into a power grid according to the current of the tested equipment and acquires the three-phase grid-connected voltage of an access node;
the semi-physical simulation platform generates a control instruction based on the three-phase grid-connected voltage of the access node and transmits the control instruction to the power amplifier;
the power amplifier controls the current and the voltage of the tested equipment accessed to the power amplifier based on the control instruction to generate a test result;
the power amplifier controls based on the control instruction, the current and the voltage of the tested device connected to the power amplifier, and generates a test result, including:
the control module of the power amplifier obtains an error signal through a control algorithm according to the control instruction and the current and voltage of the tested equipment accessed to the power amplifier, and the control module processes the error signal through PI double-loop control and repeated control to obtain a PWM signal;
the control module sends the PWM signal to a main circuit module of the power amplifier;
and the main circuit module generates a test result according to the PWM signal, wherein the test result is a oscillogram.
5. The testing method of claim 4, wherein the semi-physical simulation platform simulates the tested device to be connected to a power grid according to the current of the tested device, and collects three-phase grid-connected voltage of an access node, and comprises:
the simulation module of the semi-physical simulation platform simulates the current of the tested equipment connected to the power grid and the current of the connected node of the tested equipmentCurrent i of am 、i bm 、i cm The consistency is achieved;
and a simulation module of the semi-physical simulation platform acquires the three-phase grid-connected voltage of the access node.
6. The test method of claim 5, wherein the simulation module of the semi-physical simulation platform simulates the device under test accessing the power grid, and the current of the access node is the current i of the device under test am 、i bm 、i cm And (3) according, comprising:
current i of tested equipment to be accessed by signal simulation circuit of semi-physical simulation platform am 、i bm 、i cm Is reduced to obtain i am1 、i bm1 、i cm1 ；
The reduced current i is input by an analog input board card of the semi-physical simulation platform am1 、i bm1 、i cm1 Amplifying the current i of the tested equipment by a second signal conditioning module of the semi-physical simulation platform am 、i bm 、i cm The current with consistent magnitude and phase;
simulation module of semi-physical simulation platform and current i of tested equipment am 、i bm 、i cm The currents with the same magnitude and phase are connected into a power grid.
7. The test method of claim 4, wherein the semi-physical simulation platform generates a control command based on a three-phase grid-connected voltage of an access node and transmits the control command to the power amplifier, and comprises:
the simulation module of the semi-physical simulation platform enables the three-phase grid-connected voltage u of the access node a0 、u b0 、u c0 The first signal conditioning module is sent to the semi-physical simulation platform;
the first signal conditioning module is used for conditioning the three-phase voltage u a0 、u b0 、u c0 Is reduced to u a1 、u b1 、u c1 And sending the data to an output board card of the semi-physical simulation platform;
the output board card is used for reducing the reduced voltage u a1 、u b1 、u c1 And sending the control command to the power amplifier.
8. The test method of claim 4, wherein the control algorithm comprises:
the control module is used for multiplying the control instruction to obtain a first signal consistent with the three-phase voltage of the power grid node in phase;
and the control module calculates a difference value between the first signal and the feedback signal to obtain the error signal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810643955.7A CN110632532B (en) | 2018-06-21 | 2018-06-21 | Test system and method for meeting parallel operation of multiple groups of serial photovoltaic inverters |
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