阅读说明：本技术 一种低压直流动模试验平台 (Low-voltage direct-current dynamic die test platform ) 是由 钟建英 魏义涛 杨葆鑫 程铁汉 曾其武 王胜坤 郗姗姗 庞亚娟 廉凯凯 李智勇 于 2021-09-03 设计创作，主要内容包括：本发明涉及一种低压直流动模试验平台,属于电力电子技术领域。平台包括：至少两个交流电网模拟器,每个交流电网模拟器均配置一个第一换流器,各第一换流器的交流侧与对应的交流电网模拟器连接,各第一换流器的直流侧连接直流母线；直流母线上串联或者并联若干一次设备；第一检测装置和仿真机,第一检测装置连接仿真机的输入端；仿真机的控制端连接各交流电网模拟器和各第一换流器；仿真机中搭建有状态判断逻辑,同时仿真机中还搭建有用于扰动模型或者拓扑模型；功率放大器,仿真机的输出端连接功率放大器的输入端,功率放大器的输出端连接直流母线。本发明不仅降低了平台搭建的成本、设备的研发成本和生产周期,而且大大减小了误差。(The invention relates to a low-voltage direct-current dynamic simulation test platform, and belongs to the technical field of power electronics. The platform includes: each alternating current grid simulator is provided with a first converter, the alternating current side of each first converter is connected with the corresponding alternating current grid simulator, and the direct current side of each first converter is connected with a direct current bus; a plurality of primary devices are connected in series or in parallel on the direct current bus; the first detection device is connected with the input end of the simulation machine; the control end of the simulator is connected with each alternating current power grid simulator and each first current converter; state judgment logic is built in the simulator, and a disturbance model or a topological model is built in the simulator; the output end of the simulator is connected with the input end of the power amplifier, and the output end of the power amplifier is connected with the direct current bus. The invention not only reduces the cost of platform construction, the research and development cost of equipment and the production period, but also greatly reduces the error.)

1. The utility model provides a low pressure direct current movable mould test platform which characterized in that includes:

each alternating current network simulator is provided with a first converter, and the alternating current side of each first converter is connected with the corresponding alternating current network simulator to convert alternating current into direct current;

the direct current side of each first converter is connected with a direct current bus, and direct current is input into the direct current bus; a plurality of primary devices are connected in series or in parallel on the direct current bus;

the first detection device comprises a first voltage detection device and a first current detection device and is used for detecting current information and voltage information output by each alternating current power grid simulator and each first converter;

the first detection device is connected with the input end of the simulator and transmits the detected information to the simulator; the control end of the simulator is connected with each alternating current power grid simulator and each first current converter and is used for setting working parameters of each alternating current power grid simulator and adjusting the working mode of each first current converter; a state judgment logic is set up in the simulator and used for making corresponding logic judgment according to the detected information; meanwhile, a disturbance model for outputting a simulated disturbance signal or a topological model for outputting a simulated network topological signal is also set up in the simulator;

the output end of the simulator is connected with the input end of the power amplifier, the output end of the power amplifier is connected with the direct current bus, and the simulated disturbance signal or the simulated network topology signal output by the simulator is amplified by the power amplifier and then applied to the direct current bus to complete the test of the direct current power grid.

2. The low-voltage direct-current dynamic simulation test platform according to claim 1, further comprising at least one fan simulator, wherein each fan simulator is provided with a second converter, and an alternating current side of each second converter is connected with the corresponding fan simulator to convert alternating current into direct current; the direct current side of each second converter is connected with a direct current bus; each fan simulator and each second converter are connected with the control end of the simulator; the simulator sets the wind speed of each fan simulator, and after each fan simulator is started, alternating current signals output by the fan simulators are converted into direct current signals through the second current converter, and fan disturbance is applied to the direct current buses.

3. The low-voltage direct-current dynamic simulation test platform according to claim 2, further comprising a second detection device, including a second voltage detection device and a second current detection device, for detecting current information and voltage information output by each fan simulator and each second current converter, wherein the second detection device is connected to an input end of the simulator.

4. The low-voltage direct-current dynamic test platform according to claim 1, further comprising a third detection device, including a third voltage detection device and a third current detection device, for detecting current information and voltage information of the power amplifier, wherein the third detection device is connected to the input terminal of the simulator.

5. The low-voltage direct-current dynamic simulation test platform according to claim 1, further comprising a photovoltaic simulator and a battery simulator, wherein the photovoltaic simulator and the battery simulator are connected with a control end of the simulator, the photovoltaic simulator and the battery simulator are connected with a direct-current bus, and the simulator controls a direct-current power grid to be under an island operation condition or a grid-connected operation condition of the photovoltaic simulator so as to complete tests under different operation conditions.

6. The low-voltage direct-current dynamic simulation test platform according to claim 5, further comprising a fourth detection device and a fifth detection device, wherein the fourth detection device detects the current and the voltage of the photovoltaic simulator, the fifth detection device detects the current and the voltage of the battery simulator, and the fourth detection device and the fifth detection device are connected with the input end of the simulator.

7. The low-voltage direct-current dynamic simulation test platform according to claim 2, wherein the direct-current bus is an annular direct-current bus.

8. The low-voltage direct-current dynamic simulation test platform according to claim 1, wherein each alternating-current grid simulator, each first current converter and the first detection device are connected with the simulator through at least one signal collecting and distributing device.

9. The low-voltage direct-current dynamic simulation test platform according to claim 3, wherein each fan simulator, each second current converter and the second detection device are connected with the simulator through at least one signal collecting and distributing device.

10. The low-voltage direct-current movable die test platform as claimed in claim 1, wherein a secondary device is further connected to the simulation machine.

Technical Field

The invention relates to a low-voltage direct-current dynamic simulation test platform, and belongs to the technical field of power electronics.

Background

The direct-current distribution network has a series of advantages of improving power supply capacity, reducing line loss, flexibly accessing renewable energy sources and the like, but the direct-current distribution network is mostly a demonstration project and lacks corresponding standards and execution criteria. Therefore, in order to research and verify the influencing factors of the direct current distribution network, a dynamic simulation test platform close to the actual dynamic simulation test platform is needed to test the equipment.

The existing low-voltage direct-current dynamic die test platform mainly comprises the following two types:

1. the physical simulator is adopted to directly simulate the power distribution network, however, the method not only prolongs the test period of the power distribution network with a complex topological structure, but also greatly increases the cost.

2. A low-voltage direct-current power distribution network is built on a simulation platform for simulation, however, the difference between the method and the actual operation test environment is large, and the error of the test result is large.

Therefore, a technical scheme of a low-voltage direct-current moving die test platform which saves cost and has small error needs to be provided.

Disclosure of Invention

An object of the application is to provide a low pressure direct current movable mould test platform for solve current test platform problem with high costs, that the error is big.

In order to achieve the above object, the present application provides a technical solution of a low-voltage dc dynamic testing platform, the platform includes:

each alternating current network simulator is provided with a first converter, and the alternating current side of each first converter is connected with the corresponding alternating current network simulator to convert alternating current into direct current;

the direct current side of each first converter is connected with a direct current bus, and direct current is input into the direct current bus; a plurality of primary devices are connected in series or in parallel on the direct current bus;

the first detection device comprises a first voltage detection device and a first current detection device and is used for detecting current information and voltage information output by each alternating current power grid simulator and each first converter;

the first detection device is connected with the input end of the simulator and transmits the detected information to the simulator; the control end of the simulator is connected with each alternating current power grid simulator and each first current converter and is used for setting working parameters of each alternating current power grid simulator and adjusting the working mode of each first current converter; a state judgment logic is set up in the simulator and used for making corresponding logic judgment according to the detected information; meanwhile, a disturbance model for outputting a simulated disturbance signal or a topological model for outputting a simulated network topological signal is also set up in the simulator;

the output end of the simulator is connected with the input end of the power amplifier, the output end of the power amplifier is connected with the direct current bus, and the simulated disturbance signal or the simulated network topology signal output by the simulator is amplified by the power amplifier and then applied to the direct current bus to complete the test of the direct current power grid.

The technical scheme of the low-voltage direct-current dynamic simulation test platform has the beneficial effects that: according to the test platform, an alternating current power grid simulator is used as actual output of alternating current of mains supply, the alternating current power grid simulator is converted into direct current through a current converter and then is connected with a direct current bus, a disturbance model or a topology model is built through a simulator, a simulated disturbance signal of the disturbance model or a simulated network topology signal of the topology model is input to the direct current bus through a power amplifier, when the disturbance signal is built in the simulator, the disturbance signal can be applied to the direct current bus under the condition that the alternating current power grid simulator normally works, the working state of each device is monitored, and a test is completed; after a topology model is built in the simulator, the virtual network topology and the alternating current power grid simulator can be superposed to form a new virtual-real combined network topology, and the network structure is expanded. The invention has strong expandability through the virtual-real combined test platform, realizes the special test requirements of various complex network topological structures, adjusts the parameters of each simulator through the simulator, has high adjusting speed and high precision, can also convert various operating conditions in real time, and meets the requirements of multi-condition tests. The invention adopts a virtual-real combined mode to build the low-voltage direct-current dynamic die test platform, thereby not only reducing the cost of building the platform, the research and development cost of equipment and the production period, but also greatly reducing the error.

Furthermore, in order to improve the comprehensiveness of the test platform, the test platform further comprises at least one fan simulator, each fan simulator is provided with a second converter, and the alternating current side of each second converter is connected with the corresponding fan simulator to convert alternating current into direct current; the direct current side of each second converter is connected with a direct current bus; each fan simulator and each second converter are connected with the control end of the simulator; the simulator sets the wind speed of each fan simulator, and after each fan simulator is started, alternating current signals output by the fan simulators are converted into direct current signals through the second current converter, and fan disturbance is applied to the direct current buses.

Furthermore, in order to monitor the working conditions of the fan simulator and the second current converter, the wind turbine generator further comprises a second detection device, wherein the second detection device comprises a second voltage detection device and a second current detection device and is used for detecting current information and voltage information output by each fan simulator and each second current converter, and the second detection device is connected with the input end of the simulator.

Furthermore, in order to monitor the output power of the power amplifier, the power amplifier further comprises a third detection device, wherein the third detection device comprises a third voltage detection device and a third current detection device and is used for detecting the current information and the voltage information of the power amplifier, and the third detection device is connected with the input end of the simulator.

Furthermore, in order to improve the comprehensiveness of the test platform, the test platform further comprises a photovoltaic simulator and a battery simulator, wherein the photovoltaic simulator and the battery simulator are connected with a control end of the simulator, the photovoltaic simulator and the battery simulator are connected with a direct current bus, and the simulator controls a direct current power grid to be under an isolated island operation condition or a grid-connected operation condition of the photovoltaic simulator so as to complete tests under different operation conditions.

Furthermore, in order to monitor the working states of the photovoltaic simulator and the battery simulator, the photovoltaic simulator further comprises a fourth detection device and a fifth detection device, wherein the fourth detection device detects the current and the voltage of the photovoltaic simulator, the fifth detection device detects the current and the voltage of the battery simulator, and the fourth detection device and the fifth detection device are connected with the input end of the simulator.

Furthermore, in order to realize multi-end access to the direct current bus, the direct current bus is an annular direct current bus.

Furthermore, each alternating current network simulator, each first current converter and the first detection device are connected with the simulator through at least one signal collecting and distributing device.

Furthermore, each fan simulator, each second current converter and the second detection device are connected with the simulator through at least one signal collecting and distributing device.

Further, the simulator is also connected with secondary equipment.

Drawings

FIG. 1 is a block diagram of the low voltage DC dynamic simulation test platform of embodiment 1 of the present invention;

FIG. 2 is a flow chart of a test of a low-voltage DC dynamic test platform in embodiment 1 of the present invention;

FIG. 3 is a block diagram of the low voltage DC dynamic simulation test platform of embodiment 2 of the present invention;

fig. 4 is a test flow chart of a low-voltage direct-current dynamic test platform in embodiment 2 of the present invention;

FIG. 5 is a block diagram of the low voltage DC dynamic simulation test platform of embodiment 3 of the present invention;

fig. 6 is a test flowchart of the low-voltage direct-current dynamic test platform in embodiment 3 of the present invention.

Detailed Description

Embodiment 1 of low-voltage direct-current dynamic test platform:

the main concept of the invention is that based on the problems of high cost and large error of the existing test platform, the invention adopts the virtual-real combination mode of each physical simulator and the simulator to build the low-voltage direct-current power distribution network, different power network topology models or disturbance models can be built in the simulator according to the test requirements, and the connection between the simulator and the actual direct-current power distribution network is realized through the power amplifier, thereby improving the expansibility of the test platform.

Specifically, the low-voltage direct-current dynamic simulation test platform is shown in fig. 1, and includes two alternating-current grid simulators AC, a first detection device T1, a direct-current bus, a simulator, and a power amplifier.

The alternating current network simulator AC is used for simulating the output of commercial power alternating current, each alternating current network simulator AC is provided with a first converter MMC, the alternating current side of each first converter MMC is connected with the corresponding alternating current network simulator AC, and alternating current is converted into direct current to be output.

The direct current side of each first converter MMC is connected with a direct current bus, and direct current is input into the direct current bus; a plurality of primary devices are connected in series or in parallel on the direct current bus;

and the first detection device T1 comprises a first voltage detection device and a first current detection device, wherein the first detection device T1 is distributed at each detection node and comprises a detection device T1-1, a detection device T1-2-1, a detection device T1-2-2, a detection device T1-3, a detection device T1-4-1 and a detection device T1-4-2, and the detection devices T3526-1 and the detection devices T1-4-2 are used for detecting current information and voltage information output by each AC power grid simulator and each first converter MMC.

The detection device T1-1, the detection device T1-2-1 and the detection device T1-2-2 are connected with the input end of the simulator through a first signal collecting and distributing device, the detection device T1-3, the detection device T1-4-1 and the detection device T1-4-2 are connected with the input end of the simulator through a second signal collecting and distributing device, and each detection device transmits detected current and voltage information to the simulator; the control end of the simulator is respectively connected with each AC power grid simulator AC and each first converter MMC through corresponding signal collecting and distributing devices and is used for setting the working parameters of each AC power grid simulator and adjusting the working mode of each first converter; a state judgment logic is set up in the simulator and used for making corresponding logic judgment according to the detected information; meanwhile, a disturbance model for outputting a simulated disturbance signal or a topology model for outputting a simulated network topology signal is also built in the simulator, so that the expansion of the direct-current power distribution network or the output of the disturbance signal is realized.

The power amplifier adopts a phase series, the output end of the simulator is connected with the input end of the power amplifier, the output end of the power amplifier is connected with the direct current bus, and the simulated disturbance signal or the simulated network topology signal output by the simulator is amplified by the power amplifier and then applied to the direct current bus to complete the test of the direct current power grid. And a third detection device T3 is arranged on an output line of the power amplifier, comprises a third voltage detection device and a third current detection device, is used for detecting current information and voltage information output by the power amplifier, is arranged on the output line of the positive electrode and the negative electrode, and comprises a detection device T3-1 and a detection device T3-2. The detection device T3-1 and the detection device T3-2 are connected with the input end of the simulator through the first signal collecting and distributing device.

In the low-voltage direct-current dynamic simulation test platform, various power network topologies can be built in the simulator according to requirements, and then a virtual load model is built in the simulator, so that whether primary equipment can normally operate or not is detected when a load is connected into a direct-current power grid and the load of the power grid is changed.

Specifically, the flow of the disturbance test of the low-voltage direct-current dynamic test platform is shown in fig. 2, and includes the following steps:

1) setting an instruction value message in the simulator and issuing the instruction value message, wherein the instruction value message comprises voltage values of two alternating current network simulators AC, one first converter MMC is in a constant direct current voltage mode, and the other first converter MMC is in an active mode and a reactive mode;

2) after receiving the instruction value message of the simulator, each signal collecting and distributing device sends the instruction value message to each alternating current power grid simulator AC and each first converter MMC;

3) after each alternating current grid simulator AC and each first converter MMC receive the instruction value message, executing an instruction, starting operation and establishing a steady-state operation environment;

4) the voltage information and the current information of the corresponding nodes detected among the detection devices are sent to a simulator;

5) the simulator judges the received information, judges whether the voltage and the current exceed the corresponding set value range, stops the test if the voltage and the current exceed the corresponding set value range, and enters the next step if the voltage and the current do not exceed the set value range;

6) checking whether the primary equipment has information such as alarm and failure information which cannot be operated within the specified operation time, if so, stopping the test, and if not, entering the next step;

7) setting a virtual load capacity value P in the simulator as required, accessing the virtual load into a power amplifier through an IO interface of the simulator, amplifying the power by N times by the power amplifier, and outputting the power to a direct current bus, namely merging the virtual load into a power grid to cause power grid fluctuation;

8) and monitoring whether the primary equipment to be tested can normally and reliably run in a disturbance environment, and then finishing the test.

The primary equipment can be divided according to application scenes and comprises intelligent household equipment, such as a direct current microwave oven, a direct current refrigerator and the like; also included are distribution network devices, such as: a direct current load switch, a direct current electric energy router, and the like.

The method for judging whether the primary equipment normally operates is as follows:

the smart home devices (i.e. simple devices), such as a dc microwave oven, a dc refrigerator, etc., can check whether an alarm, an error, etc., occurs through the monitoring device of the primary device itself.

Distribution network equipment (i.e., complex equipment), such as: the direct current load switch, the direct current electric energy router and the like can be checked through a monitoring device of the equipment according to field test conditions, or monitoring signals are input into the signal collecting and distributing device through the transmission interface and enter the simulation machine for monitoring, or the direct current load switch, the direct current electric energy router and the like are combined for use.

In the test process, based on disturbance research, a virtual load model is built in the simulation machine as a disturbance model, as other implementation modes, disturbance models in other forms can be built, and if the network topology of direct current power distribution needs to be increased, a virtual alternating current power grid and a virtual current converter can be built in the simulation machine, and a direct current bus is accessed through a power amplifier so as to increase the power of the direct current power distribution network.

In the above embodiment, in order to avoid the confusion of the wiring harness, the connection between the simulator and each device is realized by the signal collecting and distributing device.

In the above embodiment, the third detecting means is provided for detecting the output power of the power amplifier, but as another embodiment, the third detecting means may not be provided when the output power of the power amplifier is ensured.

Embodiment 2 of low-voltage direct-current dynamic die test platform:

the difference between the low-voltage direct-current dynamic simulation test platform provided by the embodiment and the embodiment 1 is that a fan simulator and a second converter T2 are added, and the disturbance of the fan is added under the disturbance of the virtual load of the embodiment 1, so that the performance of primary equipment can be better tested.

Specifically, as shown in fig. 3, the low-voltage direct-current dynamic simulation test platform provided in this embodiment includes two alternating-current power grid simulators AC, a first detection device T1, a direct-current bus, two fan simulators Wind, a second detection device T2, a simulator, and a power amplifier.

The connection relationship and the function between the two AC grid simulators AC, the first detection device T1, the dc bus, the simulator and the power amplifier are mentioned in the above embodiment 1, and are not described herein again.

The fan simulator Wind is used for simulating the output of Wind power alternating current, each fan simulator Wind is provided with a second converter MMC, the alternating current side of each second converter MMC is connected with the corresponding fan simulator Wind, the direct current side of each second converter MMC is connected with a direct current bus, and alternating current is converted into direct current to be output to the direct current bus. And the direct current bus adopts the annular direct current bus in order to satisfy the connection of multi-terminal electric wire netting.

The second detection device T2 comprises a second voltage detection device and a second current detection device, the second detection device T2 is distributed at each detection node of the fan simulator Wind and the second converter MMC and comprises a detection device T2-1, a detection device T2-2, a detection device T2-3 and a detection device T2-4, and the detection devices T2 are used for detecting current information and voltage information output by each fan simulator Wind and each second converter MMC.

Each fan simulator Wind and each second converter MMC are connected with a control end of a simulation machine (the connection circuit is not shown in figure 3) and used for setting working parameters of each fan simulator Wind and adjusting the working mode of each second converter MMC through the simulation machine; the second detection device T2 is connected to the input of the simulator and transmits the information detected by each detection device to the simulator.

Meanwhile, each alternating current grid simulator AC, each first converter MMC, the first detection device T1 and the third detection device T3 are connected with the simulator through a first signal collecting and distributing device, and each fan simulator Wind, each second converter MMC and the second detection device T2 are connected with the simulator through a second signal collecting and distributing device.

The simulation machine can build various power network topology models or disturbance models according to requirements, and the simulation machine is built as a virtual load model (one kind of disturbance model) to detect whether primary equipment can normally operate or not when the virtual load and a wind turbine simulator are connected into a direct current power grid to cause the change of the power grid load.

Specifically, the flow of the disturbance test of the low-voltage direct-current dynamic simulation test platform is different from the flow of embodiment 1 in that the disturbance set in step 7) includes disturbance of a virtual load and disturbance of a fan, that is, the simulator sets a virtual load capacity value P as required, and accesses the virtual load to the power amplifier through an IO interface of the simulator, the power amplifier amplifies power by N times and outputs the amplified power to the direct-current bus, and the simulator sets a Wind speed instruction value of each fan simulator Wind as shown in fig. 4, and transmits the set Wind speed instruction value to each fan simulator Wind through the second signal collection and distribution device, and sets a working mode of the second converter MMC, and each fan simulator Wind starts to work after receiving the Wind speed instruction value. And (3) simultaneously connecting the virtual load and the fan to a direct current power grid to cause fluctuation, further monitoring whether the primary equipment to be tested can normally and reliably run in a disturbed environment in step 8), and finally finishing the test.

Regarding the access time sequence of the disturbance of the virtual load and the disturbance of the fan, the present invention is not limited, and the direct current power grid can be accessed sequentially or simultaneously.

The procedure before adding the perturbation is the same as that in embodiment 1, and is not described herein.

In the embodiment, in order to guarantee the test requirements, the number of the fan simulators Wind is 2, as other implementation modes, one fan simulator Wind can be set, and a fan model can be built in the simulator under the condition of requirements so as to realize fan disturbance.

In the above embodiment, in order to monitor the operating conditions of the fan simulator Wind and the second converter, the second detection device is used to detect the output voltages and currents of the fan simulator Wind and the second converter.

Embodiment 3 of low-voltage direct-current dynamic test platform:

the difference between the low-voltage direct-current dynamic simulation test platform provided by the embodiment and the embodiment 2 is that a photovoltaic simulator and a battery simulator are added, so that disturbance can be added under the working condition that the photovoltaic simulator in a direct-current power grid is connected to the power grid or operates in an isolated island mode, and the performance of primary equipment can be detected.

Specifically, as shown in fig. 5, the low-voltage direct-current dynamic simulation test platform provided in this embodiment includes two alternating-current power grid simulators AC, a first detection device T1, a direct-current bus, two fan simulators Wind, a second detection device T2, a photovoltaic simulator PV, a Battery simulator Battery, a simulator, and a power amplifier.

The connection relationship and the function between the two AC grid simulators AC, the first detection device T1, the dc bus, the two fan simulators Wind, the second detection device T2, the simulator, and the power amplifier are mentioned in the above embodiment 2, and are not described herein again.

The photovoltaic simulator PV collects the control end that the distributor connects the simulator through first signal to realize the parameter setting of simulator to photovoltaic simulator PV, Battery simulator Batery collects the control end that the distributor connects the simulator through the second signal, in order to realize the parameter setting of simulator to Battery simulator Batery, photovoltaic simulator PV and Battery simulator Batery output connection to direct current bus simultaneously.

A fourth detection device T4 is arranged on an output line of the photovoltaic simulator PV and is used for detecting current information and voltage information of the photovoltaic simulator PV; the output circuit of the Battery simulator Battery is provided with a fifth detection device T5 for detecting the current information and the voltage information of the Battery simulator Battery, the fourth detection device T4 is connected with the input end of the simulator through a first signal collecting and distributing device, and the fifth detection device T5 is connected with the input end of the simulator through a second signal collecting and distributing device.

The condition of the equipment after the photovoltaic simulator PV is disturbed under the conditions of grid connection and island can be detected through the low-voltage direct-current dynamic simulation test platform.

The control of the photovoltaic simulator PV under grid-connected and island working conditions is shown in fig. 6, and comprises the following steps:

1) the simulator outputs instruction values of a photovoltaic simulator PV and a Battery simulator Battery, and the photovoltaic simulator PV and the Battery simulator Battery are started, wherein the photovoltaic simulator PV is in an island operation working condition;

2) the simulator outputs the instruction values of the AC power grid simulators and the first converters MMC, and starts the AC power grid simulators and the first converters MMC;

3) and judging whether each AC power grid simulator AC can be connected to the grid or not through the current information and the voltage information acquired by the detection device, and connecting each AC power grid simulator AC to the grid under the conditions of stable power grid operation, stable voltage amplitude, stable frequency and stable phase.

Certainly, when the islanding operation and the grid-connected operation are performed, the virtual load and each fan simulator Wind are set in the simulator, the direct-current power grid disturbance under the two working conditions is achieved, whether primary equipment can normally work or not is monitored, so that the detection of the function of the primary equipment is achieved, the specific disturbance increasing process is introduced in the above embodiment 2, and details are not repeated here.

The simulator is also connected with secondary equipment, the secondary equipment comprises a measured controller and the like, and as shown in fig. 5, the measured controller is connected with the simulator to control the whole power grid. At the moment, the control logic is mainly controlled by the measured controller, and the simulator is used as a control interface.

The invention provides an operating environment for the function test of primary equipment and secondary equipment in a low-voltage direct-current power grid, and the simulator in the operating environment is connected with the direct-current bus through the power amplifier, so that the whole test platform has stronger expandability, the special test requirements of various complex network topological structures are realized, the parameters of various simulators are adjusted through the simulator, the adjusting speed is high, the precision is high, various operating conditions can be converted in real time, and the requirement of multi-condition test is met. The invention adopts a virtual-real combined mode to build the low-voltage direct-current dynamic die test platform, thereby not only reducing the cost of building the platform, the research and development cost of equipment and the production period, but also greatly reducing the error.