Testing system of wind and light storage, supply and distribution system

Abstract

The invention discloses a test system for a wind and light storage, supply and distribution system, belongs to the field of wind and light power generation, and considers that the wind and light storage, supply and distribution system constructed by simulation has the characteristics of miniaturization and low cost, and a simulation load can flexibly simulate various types of loads. The simulated wind and light storage, supply and distribution system is constructed and used for simulating a wind and light power generation system and an energy storage system, the direct-current transformer can boost the electric energy output by the simulated wind and light storage, supply and distribution system, and the simulated load can work under the power supply of the direct-current transformer. The measurement and control system can control the simulated wind and light storage, supply and distribution system to work in a steady-state power supply working condition or a dynamic power supply working condition and monitor the working state of the simulated load, so that the working states of various simulated loads in the steady-state power supply working condition or the dynamic power supply working condition of the wind and light storage, supply and distribution system can be flexibly verified; a real large-size and expensive wind-light storage, supply and distribution system and various types of loads do not need to be used, and the system has the advantages of simple structure and low cost.

Description

Technical Field

[0001] This invention relates to the field of wind and solar power generation, and in particular to a test system for a wind, solar, energy storage, power supply and distribution system. Background Technology

[0002] The wind-solar-storage power distribution system includes a wind-solar power generation system and an energy storage system. The wind-solar-storage power distribution system can supply power to the load. However, due to the strong fluctuation of the output power of the wind-solar power generation system, it is necessary to verify whether the load can work reliably under different operating conditions of the wind-solar-storage power distribution system. However, there is a lack of a mature test system for the wind-solar-storage power distribution system in the relevant technologies, which has the problems of complex structure and high cost.

[0003] Therefore, how to provide a solution to the above-mentioned technical problems is a problem that needs to be solved by those skilled in the art. Summary of the Invention

[0004] The purpose of this invention is to provide a test system for a wind-solar-storage power distribution system. This invention constructs a simulated wind-solar-storage power distribution system to simulate wind-solar power generation and energy storage systems. A DC transformer can boost the output voltage of the simulated wind-solar-storage power distribution system, and the simulated load can operate under the power supply of the DC transformer. The measurement and control system can control the simulated wind-solar-storage power distribution system to operate under steady-state or dynamic power supply conditions and monitor the operating status of the simulated load. This allows for flexible verification of the operating status of various types of simulated loads under steady-state or dynamic power supply conditions of the wind-solar-storage power distribution system. It eliminates the need for using real, large-volume, and expensive wind-solar-storage power distribution systems and various types of loads, and has the advantages of simple structure and low cost.

[0005] To address the aforementioned technical problems, this invention provides a test system for a wind-solar-storage power supply and distribution system, comprising: A simulated wind-solar-storage power distribution system is used to simulate a wind-solar power generation system and an energy storage system, wherein the wind-solar power generation system includes wind power generation equipment and / or photovoltaic power generation equipment. DC transformers are used to step up the voltage of electrical energy output from simulated wind, solar, and energy storage power distribution systems. Simulated load, used to operate with power supplied by a DC transformer; The measurement and control system is used to control the simulated wind, solar, energy storage, power supply and distribution system to operate under steady-state or dynamic power supply conditions, and to monitor the operating status of the simulated load, the output voltage of the DC transformer, and the output voltage of the energy storage system.

[0006] On the other hand, the simulated wind-solar-storage power supply and distribution system includes: A simulated wind and solar power generation system is used to simulate wind power generation equipment and / or photovoltaic power generation equipment under the control of a measurement and control system. Energy storage systems are used to store and output electrical energy; The switching module is used to realize the electrical connection between the simulated wind and solar power generation system and / or energy storage system and the low-voltage side of the DC transformer under the control of the measurement and control system.

[0007] On the other hand, the simulated wind and solar power generation system includes: An AC transformer is used to step down the voltage of mains power. A rectifier is used to rectify the alternating current output from an AC transformer in order to provide DC power. The first DC transformer module has its first end connected to the output end of the rectifier and its second end connected to the switching module, and is used to step down the output of the rectifier. The energy storage system includes: Energy storage batteries; The second DC-DC transformer module, with its first end connected to the output of the energy storage battery and its second end connected to the switching module, is used to step down the output of the energy storage battery.

[0008] On the other hand, the test system of the wind, solar, energy storage, power supply and distribution system also includes a first DC bus, a first switch, a second switch, a third switch, a fourth switch, a fifth switch, a sixth switch and a seventh switch; The first terminal of the first switch is connected to the output terminal of the rectifier, and the second terminal of the first switch is connected to the first section of the first DC bus; the first terminal of the second switch is connected to the first section of the first DC bus, and the second terminal of the second switch is connected to the first terminal of the first DC transformer module; the first terminal of the third switch is connected to the first section of the first DC bus, and the second terminal of the third switch is connected to the second section of the first DC bus; the first terminal of the fourth switch is connected to the energy storage battery, and the second terminal of the fourth switch is connected to the second section of the first DC bus; the first terminal of the fifth switch is connected to the second section of the first DC bus, and the second terminal of the fifth switch is connected to the first terminal of the second DC transformer module; the first terminal of the sixth switch is connected to the second section of the first DC bus, and the second terminal of the sixth switch is connected to the third section of the first DC bus; the first terminal of the seventh switch is connected to the third section of the first DC bus, and the second terminal of the seventh switch is left unconnected. The second end of the seventh switch is used to connect the load; The measurement and control system is also used to control the first switch, the third switch, the fourth switch, the sixth switch and the seventh switch to close, and to control the second switch and the fifth switch to close, so that power can be supplied to the outside through the seventh switch.

[0009] On the other hand, the switching module includes a second DC bus, an eighth switch, a ninth switch, a tenth switch, an eleventh switch, and a twelfth switch; The first terminal of the eighth switch is connected to the second terminal of the first DC transformer module, and the second terminal of the eighth switch is connected to the first section of the second DC bus; the first terminal of the ninth switch is connected to the first section of the second DC bus, and the second terminal of the ninth switch is connected to the input terminal of the DC transformer; the first terminal of the tenth switch is connected to the first section of the second DC bus, and the second terminal of the tenth switch is connected to the second section of the second DC bus; the first terminal of the eleventh switch is connected to the second terminal of the second DC transformer module, and the second terminal of the eleventh switch is connected to the second section of the second DC bus; the first terminal of the twelfth switch is connected to the second section of the second DC bus, and the second terminal of the twelfth switch is left floating. The second terminal of the twelfth switch is used to connect the load. The measurement and control system is also used to control the closing of the eighth, tenth, eleventh and twelfth switches, and to control the closing of the ninth switch, so as to supply power to the outside through the twelfth switch.

[0010] On the other hand, the test system of the wind, solar, energy storage, power supply and distribution system also includes a third DC bus, a thirteenth switch, a fourteenth switch, a fifteenth switch and a sixteenth switch; The first terminal of the thirteenth switch is connected to the output terminal of the DC transformer, and the second terminal of the thirteenth switch is connected to the first section of the third DC bus; the first terminal of the fourteenth switch is connected to the first section of the third DC bus, and the second terminal of the fourteenth switch is connected to the simulated load; the first terminal of the fifteenth switch is connected to the first section of the third DC bus, and the second terminal of the fifteenth switch is connected to the second section of the third DC bus; the first terminal of the sixteenth switch is connected to the second section of the third DC bus, and the second terminal of the sixteenth switch is left floating. The second terminal of the sixteenth switch is used to connect the load. The measurement and control system is also used to control the thirteenth, fifteenth and sixteenth switches to close, and to control the fourteenth switch to close, so that power can be supplied to the outside through the sixteenth switch.

[0011] On the other hand, the simulated load includes a simulated hydrogen production system.

[0012] On the other hand, the simulated load includes multiple simulated hydrogen production systems; The fourteenth switch includes multiple sub-switches. The first end of each sub-switch is connected to the first section of the third DC bus, and the second end of the sub-switch is connected to the power supply end of a corresponding set of simulated hydrogen production systems. The measurement and control system is also used to control the sub-switch corresponding to a designated set of simulated hydrogen production systems to turn off when the simulated wind, solar and energy storage power distribution system is operating under dynamic power supply conditions and all sub-switches are closed, and to apply the energy management control strategy to be tested to the simulated wind, solar and energy storage power distribution system in order to verify the energy management control strategy to be tested.

[0013] On the other hand, the first segment of the third DC bus includes several sub-segments; Each sub-segment is connected by a sectionalizing switch, and the control terminals of the sectionalizing switches are all connected to the measurement and control system; the first terminal of the sub-switch is connected to a corresponding sub-segment. The measurement and control system is also used to control the combination of the simulated hydrogen production system through various segment switches and sub-switches.

[0014] On the other hand, the energy storage battery includes a first sub-battery and a second sub-battery; The second section of the first DC bus includes a first sub-section and a second sub-section. The sixth switch is located between the first sub-section and the second sub-section. The fourth switch includes a first sub-switch and a second sub-switch. The first sub-switch is located between the first sub-battery and the first sub-section, and the second sub-switch is located between the second sub-battery and the second sub-section. The test system for the wind, solar, energy storage, power supply and distribution system also includes a third DC transformer module; The first terminal of the third DC transformer module is connected to the second terminal of the seventh switch, and the second terminal of the third DC transformer module is connected to the second terminal of the twelfth switch. The measurement and control system is also used to perform charge and discharge tests on the first and second sub-batteries when the third, tenth, and sixth switches are turned off and the fourth, fifth, seventh, eleventh, and twelfth switches are closed.

[0015] Beneficial Effects: This invention provides a test system for a wind-solar-storage power distribution system. Considering the miniaturization and low cost of the simulated wind-solar-storage power distribution system, and the ability to flexibly simulate various types of loads, this invention constructs a simulated wind-solar-storage power distribution system to simulate wind-solar power generation and energy storage systems. A DC transformer can boost the output voltage of the simulated wind-solar-storage power distribution system, and the simulated load can operate under the power supply of the DC transformer. The measurement and control system can control the simulated wind-solar-storage power distribution system to operate under steady-state or dynamic power supply conditions and monitor the operating status of the simulated load. This allows for flexible verification of the operating status of various types of simulated loads under steady-state or dynamic power supply conditions of the wind-solar-storage power distribution system. It eliminates the need for a real, large-volume, and expensive wind-solar-storage power distribution system and various types of loads, and has the advantages of simple structure and low cost. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of the present invention, the relevant technologies and the accompanying drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 A schematic diagram of the structure of a test system for a wind-solar-storage power supply and distribution system provided by the present invention; Figure 2 This is a schematic diagram of the structure of a test system for another wind-solar-storage power supply and distribution system provided by the present invention; Figure 3 A schematic diagram of the structure of a test system for another wind-solar-storage power supply and distribution system provided by the present invention. Detailed Implementation

[0018] The core of this invention is to provide a test system for a wind-solar-storage power distribution system. This invention constructs a simulated wind-solar-storage power distribution system to simulate wind-solar power generation and energy storage systems. A DC transformer can boost the output power of the simulated wind-solar-storage power distribution system, and the simulated load can operate under the power supply of the DC transformer. The measurement and control system can control the simulated wind-solar-storage power distribution system to operate under steady-state or dynamic power supply conditions and monitor the operating status of the simulated load. This allows for flexible verification of the operating status of various types of simulated loads under steady-state or dynamic power supply conditions of the wind-solar-storage power distribution system. It eliminates the need for real, large-volume, and expensive wind-solar-storage power distribution systems and various types of loads, and has the advantages of simple structure and low cost.

[0019] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0020] Please refer to Figure 1 , Figure 1 This is a schematic diagram of the structure of a test system for a wind-solar-storage power supply and distribution system provided by the present invention. The test system for the wind-solar-storage power supply and distribution system includes: A simulated wind-solar-storage power distribution system 1 is used to simulate a wind-solar power generation system and an energy storage system 12. The wind-solar power generation system includes wind power generation equipment and / or photovoltaic power generation equipment. DC transformer 2 is used to step up the voltage of the electrical energy output from the simulated wind, solar, and energy storage power distribution system 1; Simulated load 3 is used to operate under the power supply of DC transformer 2; The measurement and control system 4 is used to control the simulated wind, solar and energy storage power distribution system 1 to operate under steady-state power supply conditions or dynamic power supply conditions, and to monitor the operating status of the simulated load 3, the output voltage of the DC transformer and the output voltage of the energy storage system.

[0021] Specifically, considering the technical problems mentioned above, and taking into account the miniaturization and low cost of the simulated wind-solar-storage power distribution system, and the fact that the simulated load 3 can flexibly simulate various types of loads, this embodiment of the invention aims to construct a test system for the wind-solar-storage power distribution system based on the simulated wind-solar-storage power distribution system 1 and the simulated load 3. The DC voltage output from the simulated wind-solar-storage power distribution system 1 can be boosted by the DC transformer 2 to meet the operating voltage requirements of the simulated load 3. The simulated wind-solar-storage power distribution system 1 is different from the real wind-solar-storage power distribution system, and its output characteristics are controllable. In this embodiment of the invention, the measurement and control system 4 can control the simulated wind-solar-storage power distribution system 1 to operate under steady-state power supply conditions or dynamic power supply conditions, and monitor the operating status of the simulated load 3, thereby allowing the simulated load 3 to be tested under different operating conditions of the simulated wind-solar-storage power distribution system 1.

[0022] The coordinated power supply of the wind and solar power generation system and the energy storage system 12 includes steady-state power supply conditions or dynamic power supply conditions. The steady-state power supply conditions can usually be supplied by the energy storage system 12 alone. For the wind and solar power generation system, the volatility of its energy source leads to the volatility of its power output. For example, both wind power generation equipment and photovoltaic power generation equipment can generate full power, high proportion of power generation, low proportion of power generation, and no power generation. When wind power generation equipment and photovoltaic power generation equipment are used together, more operating conditions can be superimposed. The simulated wind, solar, energy storage, power supply and distribution system 1 can perform refined simulation of the operating conditions of wind power generation equipment and photovoltaic power generation equipment under the control of the measurement and control system 4, thereby simulating the dynamic power supply conditions of the real wind, solar, energy storage, power supply and distribution system.

[0023] Specifically, the dynamic power supply can be powered by the simulated wind and solar power generation system 11 and the energy storage system 12 together, or by the simulated wind and solar power generation system 11 alone. This embodiment of the invention does not limit the specific power supply.

[0024] In dynamic power supply conditions, the measurement and control system 4 can control the simulated wind and solar power generation system 11 to output power according to the preset wind and solar power generation curve, so as to more efficiently and accurately simulate the power output of the real wind and solar power generation system.

[0025] This invention provides a test system for a wind-solar-storage power distribution system. Considering the miniaturization and low cost of the simulated wind-solar-storage power distribution system, and the ability to flexibly simulate various types of loads, this invention constructs a simulated wind-solar-storage power distribution system to simulate wind and solar power generation and energy storage systems. A DC transformer can boost the output voltage of the simulated wind-solar-storage power distribution system, and the simulated load can operate under the power supply of the DC transformer. The measurement and control system can control the simulated wind-solar-storage power distribution system to operate under steady-state or dynamic power supply conditions and monitor the operating status of the simulated load. This allows for flexible verification of the operating status of various types of simulated loads under steady-state or dynamic power supply conditions of the wind-solar-storage power distribution system. It eliminates the need for a real, large-volume, and expensive wind-solar-storage power distribution system and various types of loads, and has the advantages of simple structure and low cost.

[0026] Based on the above embodiments: As an optional embodiment, the simulated wind-solar-storage power supply and distribution system 1 includes: The simulated wind and solar power generation system 11 is used to simulate wind power generation equipment and / or photovoltaic power generation equipment under the control of the measurement and control system 4; Energy storage system 12 is used to store and output electrical energy; The switching module is used to realize the electrical connection between the simulated wind and solar power generation system 11 and / or energy storage system 12 and the low-voltage side of the DC transformer 2 under the control of the measurement and control system 4.

[0027] Specifically, considering that the simulated wind and solar power generation system 11 and the energy storage system 12 may work alone or together when they are working in coordination, in order to better simulate the situation of their coordinated operation, in this embodiment of the invention, a switch module can be used to realize the electrical connection between the simulated wind and solar power generation system 11 and / or the energy storage system 12 and the low-voltage side of the DC transformer 2 under the control of the measurement and control system 4. This allows for efficient, flexible and low-cost simulation of different coordination modes of the simulated wind and solar power generation system 11 and the energy storage system 12.

[0028] Of course, in addition to this specific structure, the simulated wind, solar, energy storage, power supply and distribution system 1 can also have other specific structures, and the embodiments of the present invention are not limited here.

[0029] As an optional embodiment, the simulated wind and solar power generation system 11 includes: An AC transformer is used to step down the voltage of mains power. A rectifier is used to rectify the alternating current output from an AC transformer in order to provide DC power. The first DC transformer module has its first end connected to the output end of the rectifier and its second end connected to the switching module, and is used to step down the output of the rectifier. Energy storage system 12 includes: Energy storage batteries; The second DC-DC transformer module, with its first end connected to the output of the energy storage battery and its second end connected to the switching module, is used to step down the output of the energy storage battery.

[0030] Specifically, for a better explanation of the embodiments of the present invention, please refer to... Figure 2 , Figure 2 This is a schematic diagram of the structure of a test system for another wind-solar-storage power distribution system provided by the present invention. The 10kV DC mains power in the upper left corner of the figure can be used as the output of the simulated wind-solar power generation system 11 after passing through an AC transformer, a rectifier (AC / DC, AC (Alternating Current) / DC (Direct Current)) and a first DC transformer module (DC / DC connected to switch QF21 and DC / DC connected to switch QF22). Considering that the simulation of the wind-solar power generation system can be achieved efficiently and accurately by connecting and adjusting the mains power, the simulated wind-solar power generation system 11 in this embodiment of the present invention includes an AC transformer, a rectifier, and a first DC transformer module. The AC transformer can step down the mains power so that the rectifier can perform rectification work, while the first DC transformer module can simulate the voltage output of the real wind-solar power generation system. The simulated wind-solar power generation system 11 in this embodiment of the present invention has the advantages of simple structure and low cost.

[0031] In addition, the energy storage battery and the second DC transformer module can form a simple and low-cost energy storage system 12.

[0032] Of course, in addition to this specific form, the simulated wind and solar power generation system 11 and the energy storage system 12 can also be in other forms, and the embodiments of the present invention are not limited here.

[0033] As an optional embodiment, the test system for the wind-solar-storage power distribution system also includes a first DC bus, a first switch, a second switch, a third switch, a fourth switch, a fifth switch, a sixth switch, and a seventh switch; The first terminal of the first switch is connected to the output terminal of the rectifier, and the second terminal of the first switch is connected to the first section of the first DC bus; the first terminal of the second switch is connected to the first section of the first DC bus, and the second terminal of the second switch is connected to the first terminal of the first DC transformer module; the first terminal of the third switch is connected to the first section of the first DC bus, and the second terminal of the third switch is connected to the second section of the first DC bus; the first terminal of the fourth switch is connected to the energy storage battery, and the second terminal of the fourth switch is connected to the second section of the first DC bus; the first terminal of the fifth switch is connected to the second section of the first DC bus, and the second terminal of the fifth switch is connected to the first terminal of the second DC transformer module; the first terminal of the sixth switch is connected to the second section of the first DC bus, and the second terminal of the sixth switch is connected to the third section of the first DC bus; the first terminal of the seventh switch is connected to the third section of the first DC bus, and the second terminal of the seventh switch is left unconnected. The second end of the seventh switch is used to connect the load; The measurement and control system 4 is also used to control the closing of the first switch, the third switch, the fourth switch, the sixth switch and the seventh switch, and to control the closing of the second switch and the fifth switch, so as to supply power to the outside through the seventh switch.

[0034] Specifically, considering that the test system of the wind-solar-storage power distribution system in this embodiment of the invention can also serve as a test power source to supply power to other loads, thereby improving the utilization rate of the test device, this embodiment of the invention also designs a first DC bus and a series of switches arranged around it. Figure 2 The first DC bus is the DC 1kV DC bus in the DC 1kV switching cabinet. QF01 is the first switch, QF21 and QF22 constitute the second switch (the number of DC / DC converters in the first DC transformer module can be flexibly set, and the number of sub-switches in the second switch is consistent with the number of DC / DC converters in the first DC transformer module), QF03 is the third switch, QF41 (first sub-switch) and QF42 (second sub-switch) constitute the fourth switch (the number of sub-batteries in the energy storage system 12 can be flexibly set, and the number of sub-switches in the fourth switch is consistent with the number of sub-batteries), QF05 is the fifth switch, QF06 is the sixth switch, and QF07 is the seventh switch. The second end of the seventh switch can be used as the first interface to provide DC 11-1000V test power.

[0035] When power is to be supplied to the outside through the first interface, the measurement and control system 4 can control the first switch, the third switch, the fourth switch, the sixth switch and the seventh switch to close, and control the second switch and the fifth switch to close, so that power can be supplied to the outside through the seventh switch.

[0036] As an optional embodiment, the switch module includes a second DC bus, an eighth switch, a ninth switch, a tenth switch, an eleventh switch, and a twelfth switch; The first terminal of the eighth switch is connected to the second terminal of the first DC transformer module, and the second terminal of the eighth switch is connected to the first section of the second DC bus; the first terminal of the ninth switch is connected to the first section of the second DC bus, and the second terminal of the ninth switch is connected to the input terminal of the DC transformer 2; the first terminal of the tenth switch is connected to the first section of the second DC bus, and the second terminal of the tenth switch is connected to the second section of the second DC bus; the first terminal of the eleventh switch is connected to the second terminal of the second DC transformer module, and the second terminal of the eleventh switch is connected to the second section of the second DC bus; the first terminal of the twelfth switch is connected to the second section of the second DC bus, and the second terminal of the twelfth switch is left floating. The second terminal of the twelfth switch is used to connect the load. The measurement and control system 4 is also used to control the closing of the eighth, tenth, eleventh and twelfth switches, and to control the closing of the ninth switch, so as to supply power to the outside through the twelfth switch.

[0037] Specifically, considering that the output voltages of the first and second DC transformer modules can be used as another level of DC voltage for external power supply, this embodiment of the invention designs a second DC bus and a series of switches arranged around it. Figure 2 The DC2kV bus in the DC2kV switching cabinet is the second DC bus. QF81 (first sub-switch) and QF82 (second sub-switch) constitute the eighth switch (the number of sub-switches in the eighth switch is consistent with the number of DC / DC converters in the first DC transformer module). QF09 is the ninth switch, QF10 is the tenth switch, QF11 is the eleventh switch, and QF12 is the twelfth switch. The second end of QF12 can be used as a second interface to provide DC1000-2000V experimental power.

[0038] When power is to be supplied to the outside through the second interface, the measurement and control system 4 can control the eighth, tenth, eleventh and twelfth switches to close and control the ninth switch to close, so that power can be supplied to the outside through the twelfth switch. At this time, the control of the first to seventh switches is only to supply power to the second interface. The embodiments of the present invention will not be described in detail here.

[0039] As an optional embodiment, the test system for the wind-solar-storage power distribution system also includes a third DC bus, a thirteenth switch, a fourteenth switch, a fifteenth switch, and a sixteenth switch; The first terminal of the thirteenth switch is connected to the output terminal of DC transformer 2, and the second terminal of the thirteenth switch is connected to the first section of the third DC bus; the first terminal of the fourteenth switch is connected to the first section of the third DC bus, and the second terminal of the fourteenth switch is connected to the analog load 3; the first terminal of the fifteenth switch is connected to the first section of the third DC bus, and the second terminal of the fifteenth switch is connected to the second section of the third DC bus; the first terminal of the sixteenth switch is connected to the second section of the third DC bus, and the second terminal of the sixteenth switch is left floating. The second terminal of the sixteenth switch is used to connect the load. The measurement and control system 4 is also used to control the closing of the thirteenth, fifteenth and sixteenth switches, and to control the closing of the fourteenth switch, so that power can be supplied to the outside through the sixteenth switch.

[0040] Specifically, considering that the output voltage of DC transformer 2 can be used as another level of DC voltage for external power supply, this embodiment of the invention also includes a third DC bus and a series of switches arranged around it. Figure 2 In the DC20kV switching cabinet, the DC20kV DC bus is the third DC bus. QF13 is the thirteenth switch. QF141 (first sub-switch) and QF142 (second sub-switch) constitute the fourteenth switch. QF15 is the fifteenth switch, and QF16 is the sixteenth switch. The second end of the sixteenth switch can be used as the third interface to provide DC3kV-20kV test power.

[0041] When power is to be supplied to the outside through the third interface, the measurement and control system 4 can control the thirteenth, fifteenth and sixteenth switches to close and control the fourteenth switch to close, so that power can be supplied to the outside through the sixteenth switch. At the same time, the control of the first to twelfth switches is only for the purpose of supplying power to the outside through the third interface. The embodiments of the present invention will not be described in detail here.

[0042] As an optional embodiment, the simulated load 3 includes a simulated hydrogen production system.

[0043] Specifically, DC hydrogen production from wind, solar, energy storage, power supply and distribution systems is a typical application. Therefore, implementing the simulated load 3 as a simulated hydrogen production system has the advantage of strong practicality.

[0044] Hydrogen production systems can include various types, such as PEM (Proton Exchange) cell hydrogen production systems (in... Figure 2 The system consists of a PEM cell hydrogen production power supply and an electrolyzer volt-ampere characteristic simulation device, and an alkaline cell hydrogen production system (in...). Figure 2 The embodiments of the present invention are not limited to those described herein, including those consisting of an alkaline tank hydrogen production power supply and an electrolyzer volt-ampere characteristic simulation device.

[0045] Of course, besides the hydrogen production system, the simulated load 3 can be of many other types, and this embodiment of the invention does not limit it.

[0046] As an optional embodiment, the simulated load 3 includes multiple simulated hydrogen production systems; The fourteenth switch includes multiple sub-switches. The first end of each sub-switch is connected to the first section of the third DC bus, and the second end of the sub-switch is connected to the power supply end of a corresponding simulated hydrogen production system. The measurement and control system 4 is also used to control the sub-switch corresponding to a designated set of simulated hydrogen production systems to turn off when the simulated wind, solar and energy storage power distribution system 1 is operating under dynamic power supply conditions and all sub-switches are closed, and to apply the energy management control strategy to be tested to the simulated wind, solar and energy storage power distribution system 1 so as to verify the energy management control strategy to be tested.

[0047] Specifically, considering that multiple hydrogen production systems may be used simultaneously in the DC hydrogen production scenario of the wind, solar, energy storage, and power distribution system, in order to more realistically simulate the actual scenario of load 3, the simulated load 3 in this embodiment of the invention includes multiple simulated hydrogen production systems. When multiple simulated hydrogen production systems are operating simultaneously under power, a failure of one of the hydrogen production systems will impact other equipment in the system. At this time, the devices in the power distribution system can be controlled through energy management and control strategies to eliminate power oscillations. Therefore, the measurement and control system 4 in this embodiment of the invention can control the sub-switch corresponding to a designated simulated hydrogen production system to turn off when the simulated wind, solar, energy storage, and power distribution system 1 is operating under dynamic power supply conditions and all sub-switches are closed, so as to simulate the situation of a sudden failure of one of the hydrogen production systems and apply the energy management and control strategy to be tested to the simulated wind, solar, energy storage, and power distribution system 1 in order to verify the energy management and control strategy to be tested.

[0048] The specific number of hydrogen production systems can be flexibly set independently; for example, it can be... Figure 2 The configuration, etc., in this embodiment of the invention are not limited.

[0049] Specifically, a designated set of simulated hydrogen production systems can also be flexibly configured, for example, it can be... Figure 2 The embodiments of the present invention are not limited to PEM tank hydrogen production systems or alkaline tank hydrogen production systems.

[0050] As an optional embodiment, the first segment of the third DC bus includes several sub-segments; Each sub-segment is connected by a segment switch, and the control terminal of each segment switch is connected to the measurement and control system 4; the first terminal of each sub-switch is connected to a corresponding sub-segment. The measurement and control system 4 is also used to control the combination of the simulated hydrogen production system through various segment switches and sub-switches.

[0051] Specifically, in order to more flexibly select the hydrogen production system to be powered and to more reliably supply power to each hydrogen production system, the first section of the third DC bus in this embodiment of the invention includes several sub-sections, and each sub-section corresponds one-to-one with a hydrogen production system. The sub-sections are connected by sectionalizing switches (e.g., Figure 2 FD01 in the diagram is a segmented switch. The combination of the electrically powered simulated hydrogen production system can be flexibly controlled through the various segmented switches and sub-switches.

[0052] As an optional embodiment, the energy storage battery includes a first sub-battery and a second sub-battery; The second section of the first DC bus includes a first sub-section and a second sub-section. The sixth switch is located between the first sub-section and the second sub-section. The fourth switch includes a first sub-switch and a second sub-switch. The first sub-switch is located between the first sub-battery and the first sub-section, and the second sub-switch is located between the second sub-battery and the second sub-section. The test system for the wind, solar, energy storage, power supply and distribution system also includes a third DC transformer module; The first terminal of the third DC transformer module is connected to the second terminal of the seventh switch, and the second terminal of the third DC transformer module is connected to the second terminal of the twelfth switch. The measurement and control system 4 is also used to perform charge and discharge tests on the first sub-battery and the second sub-battery when the third, tenth, and sixth switches are turned off and the fourth, fifth, seventh, eleventh, and twelfth switches are closed.

[0053] Specifically, for a better explanation of the embodiments of the present invention, please refer to... Figure 3 , Figure 3 This is a schematic diagram of the structure of a test system for another wind-solar-storage power supply and distribution system provided by the present invention. Figure 3 The DC / DC converter mentioned here refers to a DC / DC converter that can support bidirectional conversion. Considering that multiple batteries can form a more reliable energy storage system 12, the energy storage battery in this embodiment of the invention may include a first sub-battery and a second sub-battery. For the wind-solar-storage power distribution system, the charging and discharging reliability of each battery in the energy storage system 12 is also crucial. Therefore, in this embodiment of the invention, a third DC transformer module can be connected between the seventh switch and the twelfth switch (that is, between the first interface and the second interface), and a loop can be formed between the first sub-battery, the second sub-battery, the second DC transformer module, and the third DC transformer module through the on and off states of the switches. Based on this loop, the working mode of the first sub-battery charging the second sub-battery or the second sub-battery charging the first sub-battery can be realized, and the charging and discharging tests of the first sub-battery and the second sub-battery can be realized in this process.

[0054] The various embodiments described in this specification are presented in a progressive manner, with each embodiment focusing on its differences from other embodiments. Similar or identical parts between embodiments can be referred to interchangeably. It should also be noted that in this specification, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes that element.

[0055] The above description of the disclosed embodiments enables those skilled in the art to make or use the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, the invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A test system for a wind-solar-storage power supply and distribution system, characterized in that, include: A simulated wind-solar-storage power distribution system is used to simulate a wind-solar power generation system and an energy storage system, wherein the wind-solar power generation system includes wind power generation equipment and / or photovoltaic power generation equipment. DC transformers are used to step up the voltage of electrical energy output from simulated wind, solar, and energy storage power distribution systems. Simulated load, used to operate with power supplied by a DC transformer; The measurement and control system is used to control the simulated wind, solar and energy storage power distribution system to operate under steady-state or dynamic power supply conditions, and to monitor the operating status of the simulated load, the output voltage of the DC transformer and the output voltage of the energy storage system.

2. The test system for the wind-solar-storage power supply and distribution system according to claim 1, characterized in that, The simulated wind-solar-storage power distribution system includes: A simulated wind and solar power generation system is used to simulate wind power generation equipment and / or photovoltaic power generation equipment under the control of a measurement and control system. Energy storage systems are used to store and output electrical energy; The switching module is used to realize the electrical connection between the simulated wind and solar power generation system and / or energy storage system and the low-voltage side of the DC transformer under the control of the measurement and control system.

3. The test system for the wind-solar-storage power supply and distribution system according to claim 2, characterized in that, The simulated wind and solar power generation system includes: An AC transformer is used to step down the voltage of mains power. A rectifier is used to rectify the alternating current output from an AC transformer in order to provide DC power. The first DC transformer module, with its first end connected to the output end of the rectifier and its second end connected to the switching module, is used to step down the output of the rectifier. The energy storage system includes: Energy storage batteries; The second DC transformer module has its first terminal connected to the output terminal of the energy storage battery and its second terminal connected to the switch module, and is used to step down the output voltage of the energy storage battery.

4. The test system for the wind-solar-storage power supply and distribution system according to claim 3, characterized in that, The test system of the wind, solar, energy storage, power supply and distribution system also includes a first DC bus, a first switch, a second switch, a third switch, a fourth switch, a fifth switch, a sixth switch and a seventh switch; The first terminal of the first switch is connected to the output terminal of the rectifier, and the second terminal of the first switch is connected to the first section of the first DC bus; the first terminal of the second switch is connected to the first section of the first DC bus, and the second terminal of the second switch is connected to the first terminal of the first DC transformer module; the first terminal of the third switch is connected to the first section of the first DC bus, and the second terminal of the third switch is connected to the second section of the first DC bus; the first terminal of the fourth switch is connected to the energy storage battery, and the second terminal of the fourth switch is connected to the second section of the first DC bus; the first terminal of the fifth switch is connected to the second section of the first DC bus, and the second terminal of the fifth switch is connected to the first terminal of the second DC transformer module; the first terminal of the sixth switch is connected to the second section of the first DC bus, and the second terminal of the sixth switch is connected to the third section of the first DC bus; the first terminal of the seventh switch is connected to the third section of the first DC bus, and the second terminal of the seventh switch is left unconnected. The second end of the seventh switch is used to connect the load; The measurement and control system is also used to control the first switch, the third switch, the fourth switch, the sixth switch and the seventh switch to close, and to control the second switch and the fifth switch to close, so that power can be supplied to the outside through the seventh switch.

5. The test system for the wind-solar-storage power supply and distribution system according to claim 4, characterized in that, The switching module includes a second DC bus, an eighth switch, a ninth switch, a tenth switch, an eleventh switch, and a twelfth switch; The first terminal of the eighth switch is connected to the second terminal of the first DC transformer module, and the second terminal of the eighth switch is connected to the first section of the second DC bus; the first terminal of the ninth switch is connected to the first section of the second DC bus, and the second terminal of the ninth switch is connected to the input terminal of the DC transformer; the first terminal of the tenth switch is connected to the first section of the second DC bus, and the second terminal of the tenth switch is connected to the second section of the second DC bus; the first terminal of the eleventh switch is connected to the second terminal of the second DC transformer module, and the second terminal of the eleventh switch is connected to the second section of the second DC bus; the first terminal of the twelfth switch is connected to the second section of the second DC bus, and the second terminal of the twelfth switch is left floating. The second terminal of the twelfth switch is used to connect the load. The measurement and control system is also used to control the closing of the eighth, tenth, eleventh and twelfth switches, and to control the closing of the ninth switch, so as to supply power to the outside through the twelfth switch.

6. The test system for the wind-solar-storage power supply and distribution system according to claim 5, characterized in that, The test system for the wind, solar, energy storage, power supply and distribution system also includes a third DC bus, a thirteenth switch, a fourteenth switch, a fifteenth switch and a sixteenth switch; The first terminal of the thirteenth switch is connected to the output terminal of the DC transformer, and the second terminal of the thirteenth switch is connected to the first section of the third DC bus; the first terminal of the fourteenth switch is connected to the first section of the third DC bus, and the second terminal of the fourteenth switch is connected to the simulated load; the first terminal of the fifteenth switch is connected to the first section of the third DC bus, and the second terminal of the fifteenth switch is connected to the second section of the third DC bus; the first terminal of the sixteenth switch is connected to the second section of the third DC bus, and the second terminal of the sixteenth switch is left floating. The second terminal of the sixteenth switch is used to connect the load. The measurement and control system is also used to control the thirteenth, fifteenth and sixteenth switches to close, and to control the fourteenth switch to close, so that power can be supplied to the outside through the sixteenth switch.

7. The test system for the wind-solar-storage power supply and distribution system according to claim 5, characterized in that, The simulated load includes a simulated hydrogen production system.

8. The test system for the wind-solar-storage power supply and distribution system according to claim 6, characterized in that, The simulated load includes multiple simulated hydrogen production systems; The fourteenth switch includes multiple sub-switches. The first end of each sub-switch is connected to the first section of the third DC bus, and the second end of the sub-switch is connected to the power supply end of a corresponding set of simulated hydrogen production systems. The measurement and control system is also used to control the sub-switch corresponding to a designated set of simulated hydrogen production systems to turn off when the simulated wind, solar and energy storage power distribution system is operating under dynamic power supply conditions and all sub-switches are closed, and to apply the energy management control strategy to be tested to the simulated wind, solar and energy storage power distribution system in order to verify the energy management control strategy to be tested.

9. The test system for the wind-solar-storage power supply and distribution system according to claim 8, characterized in that, The first segment of the third DC bus includes several sub-segments; Each sub-segment is connected by a sectionalizing switch, and the control terminals of the sectionalizing switches are all connected to the measurement and control system; the first terminal of the sub-switch is connected to a corresponding sub-segment. The measurement and control system is also used to control the combination of the simulated hydrogen production system through various segment switches and sub-switches.

10. The test system for the wind-solar-storage power supply and distribution system according to any one of claims 5 to 9, characterized in that, The energy storage battery includes a first sub-battery and a second sub-battery; The second section of the first DC bus includes a first sub-section and a second sub-section. The sixth switch is located between the first sub-section and the second sub-section. The fourth switch includes a first sub-switch and a second sub-switch. The first sub-switch is located between the first sub-battery and the first sub-section, and the second sub-switch is located between the second sub-battery and the second sub-section. The test system for the wind, solar, energy storage, power supply and distribution system also includes a third DC transformer module; The first terminal of the third DC transformer module is connected to the second terminal of the seventh switch, and the second terminal of the third DC transformer module is connected to the second terminal of the twelfth switch. The measurement and control system is also used to perform charge and discharge tests on the first and second sub-batteries when the third, tenth, and sixth switches are turned off and the fourth, fifth, seventh, eleventh, and twelfth switches are closed.

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