Micro-grid testing device and micro-grid testing system

Abstract

The utility model is suitable for the technical field of electronics, and provides a micro-grid testing device and a micro-grid testing system, and the micro-grid testing device comprises a control module which is used for outputting a frequency control signal and a voltage control signal; the motor module is connected with the control module and used for adjusting the power supply frequency according to the frequency control signal and rotating under the adjusted power supply frequency; the voltage regulating plate is respectively connected with the control module and the generator and is used for outputting corresponding exciting current according to the voltage control signal; and the generator is connected with a rotating shaft of the motor module and is used for generating power and outputting target voltage under the action of the exciting current and the driving of the motor module. Compared with the prior art, the diesel generating set can be replaced by the motor module and the generator, the motor module and the generator can completely simulate the electrical and communication characteristics of the diesel generating set, the noise is low, the pollution is small, regular purchase of diesel oil is avoided, and the purchase cost is reduced.

Description

Technical Field

[0001] This application belongs to the field of electronic technology, and in particular relates to a microgrid testing device and a microgrid testing system. Background Technology

[0002] A microgrid is a small-scale power generation and distribution system consisting of distributed power sources, energy storage devices, energy conversion devices, loads, monitoring and protection devices. Currently, diesel generator sets are commonly used to simulate microgrid environments. However, diesel generator sets are not only noisy and emit exhaust fumes, but also require regular diesel fuel purchases, resulting in high costs. Utility Model Content

[0003] In view of this, embodiments of this application provide a microgrid testing device and a microgrid testing system to solve the technical problems of existing diesel generator sets not only producing high noise and exhaust gas during operation, but also requiring regular purchases of diesel fuel, resulting in excessively high purchase costs.

[0004] This application provides a microgrid testing device, including:

[0005] The control module is used to output frequency control signals and voltage control signals;

[0006] The motor module is connected to the control module and is used to adjust the power supply frequency according to the frequency control signal, and to rotate at the adjusted power supply frequency.

[0007] A voltage regulating plate is connected to the control module and the generator respectively, and is used to output a corresponding excitation current according to the voltage control signal;

[0008] The generator is connected to the shaft of the motor module and is used to generate electricity and output the target voltage under the action of the excitation current and the drive of the motor module.

[0009] Optionally, the motor module includes:

[0010] A frequency converter, connected to the control module, is used to output a power supply frequency corresponding to the frequency control signal according to the frequency control signal;

[0011] An electric motor, connected to the frequency converter, is used to rotate at a target speed corresponding to the power supply frequency.

[0012] Optionally, the control module includes:

[0013] The data acquisition component is connected to the actual power grid and the motor module respectively, and is used to acquire the first operating parameters of the microgrid test device, the second operating parameters of the actual power grid, and the current speed of the motor module;

[0014] The control component generates the frequency control signal and the voltage control signal based on the first operating parameter, the second operating parameter, and the current rotational speed.

[0015] A communication component is connected to the motor module and the voltage regulating plate respectively, and is used to communicate with the motor module and the voltage regulating plate.

[0016] Optionally, the control component includes:

[0017] The first control unit is configured to generate the frequency control signal based on the first operating parameter, the second operating parameter, and the current rotational speed.

[0018] The second control unit is used to generate the voltage control signal based on the first operating parameter and the second operating parameter.

[0019] Optionally, the microgrid testing device further includes a fault simulation module, which is connected to the control module, the voltage regulator, and the generator respectively.

[0020] The control module is also used to output phase control signals;

[0021] The fault simulation module is used to control each phase of the generator according to the phase control signal to simulate various power grid faults.

[0022] Optionally, the fault simulation module includes: an I / O control board and multiple switching components;

[0023] The IO control board is connected to the control module and is used to control the on / off state of the plurality of switching components according to the phase control signal;

[0024] The plurality of switching components are connected to different phases of the generator to form different connection paths.

[0025] Optionally, the microgrid testing device further includes a feedback module, which is connected to the control module, the generator, and the voltage regulator plate respectively.

[0026] The feedback module is used to feed AC power back to the microgrid testing device.

[0027] Optionally, the control module is also used to output a first power control signal;

[0028] The feedback module is also used to adjust the output power according to the first power control signal;

[0029] The control module is also used to generate a second power control signal based on the adjusted output power;

[0030] Accordingly, the motor module is also used to adjust the operating power according to the second power control signal.

[0031] Optionally, the feedback module includes a power supply and an inverter.

[0032] Secondly, embodiments of this application provide a microgrid testing system, including a host computer and the microgrid testing device described in the first aspect or any optional embodiment of the first aspect;

[0033] The host computer is communicatively connected to the microgrid testing device and is used to send various control commands to the microgrid testing device.

[0034] The microgrid testing device is used to execute the set operations corresponding to the various control commands.

[0035] The microgrid testing device and microgrid testing system provided in this application have the following beneficial effects:

[0036] The microgrid testing device provided in this application embodiment can replace diesel generator sets with motor modules and generators. These motor modules and generators can not only completely simulate the electrical and communication characteristics of diesel generator sets, but also have low noise and low pollution. At the same time, they can avoid the need to purchase diesel regularly, thus reducing purchase costs. Attached Figure Description

[0037] To more clearly illustrate the technical solutions in the embodiments of this application, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0038] Figure 1 This is a schematic diagram of the structure of a microgrid testing device provided in an embodiment of this application;

[0039] Figure 2 This is a schematic diagram of the structure of a microgrid testing device provided in another embodiment of this application;

[0040] Figure 3 This is a schematic diagram of the structure of a microgrid testing device provided in another embodiment of this application;

[0041] Figure 4A schematic diagram of the structure of a microgrid testing device provided in another embodiment of this application;

[0042] Figure 5 A schematic diagram of the structure of a microgrid testing device provided in another embodiment of this application;

[0043] Figure 6 A schematic diagram of the structure of a microgrid testing device provided in another embodiment of this application;

[0044] Figure 7 A schematic diagram of the structure of a microgrid testing device provided in another embodiment of this application;

[0045] Figure 8 This is a schematic diagram of the structure of a microgrid testing system provided in an embodiment of this application;

[0046] Figure 9 The execution flowchart of each test item provided in an embodiment of this application is shown. Detailed Implementation

[0047] To facilitate a clear description of the technical solutions in the embodiments of this application, the terms "first" and "second" are used in the embodiments of this application to distinguish identical or similar items with essentially the same function and effect. For example, the first voltage value and the second voltage value are only used to distinguish different voltage values ​​and do not limit their order. Those skilled in the art will understand that the terms "first" and "second" do not limit the quantity or execution order, and the terms "first" and "second" are not necessarily different.

[0048] It should be noted that, in this application, the terms "exemplary" or "for example" are used to indicate that something is being described as an example, illustration, or illustration. Any embodiment or design described as "exemplary" or "for example" in this application should not be construed as being more preferred or advantageous than other embodiments or design solutions. Specifically, the use of terms such as "exemplary" or "for example" is intended to present the relevant concepts in a concrete manner.

[0049] In this application, "at least one" means one or more, and "more" means two or more. "And / or" describes the relationship between related objects, indicating that there can be three relationships. For example, A and / or B can mean: A exists alone, A and B exist simultaneously, or B exists alone, where A and B can be singular or plural.

[0050] Please see Figure 1 , Figure 1 This is a schematic diagram of the structure of a microgrid testing device provided in an embodiment of this application.

[0051] like Figure 1As shown, the microgrid testing device 10 may include: a control module 11, a motor module 12, a voltage regulator 13, and a generator 14. Wherein:

[0052] The control module 11 is used to output frequency control signals and voltage control signals.

[0053] The motor module 12 is connected to the control module 11 and is used to adjust the power supply frequency according to the frequency control signal and rotate at the adjusted power supply frequency.

[0054] The voltage regulating plate 13 is connected to the control module 11 and the generator 14 respectively, and is used to output the corresponding excitation current according to the voltage control signal.

[0055] The generator 14 is connected to the shaft of the motor module 12 and is used to generate electricity and output the target voltage under the action of the excitation current and the drive of the motor module.

[0056] In this embodiment of the application, in order to realize the external output of the microgrid test device 10, that is, to control the generator 14 to output the corresponding voltage, the control module 11 can send a frequency control signal to the motor module 12 and a voltage control signal to the voltage regulating plate 13.

[0057] In practical applications, the control module 11 can be a controller. For example, the control module 11 can be a microcontroller unit (MCU), a microprocessor unit (MPU), or a central processing unit (CPU), without limitation.

[0058] In this embodiment, the control module 11 is communicatively connected to the motor module 12 and the voltage regulating plate 13, respectively.

[0059] In some possible embodiments, the control module 11 can communicate with the motor module 12 via Ethernet or a serial communication interface standard (RS485).

[0060] In some other possible embodiments, the control module 11 can communicate with the voltage regulator board 13 via the Controller Area Network (CAN) bus.

[0061] In this embodiment of the application, when the motor module 12 receives the frequency control signal, it indicates that it needs to adjust its own power supply. Therefore, the motor module 12 can adjust its own power supply frequency according to the frequency control signal, so that it can rotate at the adjusted power supply frequency, that is, rotate based on the adjusted rotation speed.

[0062] In practical applications, the motor module 12 may include an asynchronous motor.

[0063] Therefore, in some possible embodiments, when the motor module 12 receives the frequency control signal, it indicates that the power supply frequency of the asynchronous motor needs to be adjusted. Thus, the motor module 12 can adjust the power supply frequency of the asynchronous motor according to the frequency control signal, thereby adjusting the speed of the asynchronous motor so that the asynchronous motor can rotate at the adjusted power supply frequency, that is, rotate based on the adjusted speed.

[0064] In this embodiment of the application, when the voltage regulating plate 13 receives the voltage control signal, it indicates that the output voltage of the generator 14 needs to be adjusted. Therefore, the voltage regulating plate 13 can output a corresponding excitation current according to the voltage control signal, that is, adjust the excitation current of the generator 14, thereby adjusting the output voltage of the generator 14.

[0065] In practical applications, broadly speaking, providing a working magnetic field for generators and other electrical equipment that "operate using the principle of electromagnetic induction" is called excitation, and the current generated when providing the working magnetic field is called excitation current.

[0066] Since the generator 14 and the motor module 12 are connected via a rotating shaft, the motor module 12 can drive the generator 14 to rotate when it rotates, causing the generator 14 to generate current. Therefore, in this embodiment, the generator 14 can generate electricity and output the target voltage under the action of the excitation current and the drive of the motor module.

[0067] It should be noted that the frequency of the target voltage can be determined by the rotational speed of the motor module 12.

[0068] In practical applications, generator 14 can be an AC generator.

[0069] As can be seen from the above, the microgrid testing device provided in this application embodiment can replace the diesel generator set with a motor module and a generator. The motor module and generator can not only completely simulate the electrical and communication characteristics of the diesel generator set, but also have low noise and low pollution. At the same time, it avoids the need to purchase diesel regularly, thus reducing the purchase cost.

[0070] Please see Figure 2 , Figure 2 This is a schematic diagram of a microgrid testing device provided in another embodiment of this application. Figure 2 As shown, relative to Figure 1In a corresponding embodiment, in order to simulate and test various power grid faults, the microgrid test device 10 may further include a fault simulation module 15.

[0071] Specifically, the fault simulation module 15 is connected to the control module 11, the voltage regulating plate 13, and the generator 14, respectively.

[0072] In this embodiment, the fault simulation module 15 is communicatively connected to the control module 11, and the fault simulation module 15 is connected to the voltage regulating plate 13 and the generator 14 via power lines.

[0073] In practical applications, power lines are the main lines in power transmission lines that transmit electricity. They are usually composed of high-voltage cables or high-voltage wires and are used to transmit electricity.

[0074] In some possible embodiments, the control module 11 can communicate with the fault simulation module 15 via Ethernet.

[0075] In this embodiment, the control module 11 is also used to output a phase control signal.

[0076] The fault simulation module 15 is used to control each phase of the generator 14 according to the phase control signal to simulate various power grid faults.

[0077] In this embodiment, the generator 14 is a multiphase generator. Therefore, the fault simulation module 15 can control each phase of the generator 14 according to the phase control signal to simulate various power grid faults.

[0078] The phase control signals include, but are not limited to, normal voltage control signals, phase-to-phase short-circuit control signals, phase-to-ground short-circuit control signals, and phase-to-neutral line short-circuit control signals.

[0079] The normal control signal is used to indicate that no control is performed on any phase of the generator 14 so that the generator 14 outputs the target voltage, i.e., the normal output voltage.

[0080] The power grid fault corresponding to the phase-to-phase short circuit control signal is the phase-to-phase short circuit fault; the power grid fault corresponding to the phase-to-ground short circuit control signal is the phase-to-ground short circuit fault; and the power grid fault corresponding to the phase-to-neutral (N) line short circuit control signal is the phase-to-neutral (N) line short circuit fault.

[0081] In practical applications, a phase-to-phase short circuit, also known as a phase-to-line short circuit, refers to the direct connection between any two phases, such as phase A and phase B or phase C being directly connected.

[0082] A phase-to-ground short circuit, also known as a phase-to-ground short circuit, refers to a situation where the phase line corresponding to any one phase is directly connected to the ground line, such as phase A, phase B, or phase C being directly connected to the ground line (PE).

[0083] A relative N-line short circuit refers to the phenomenon where the phase line corresponding to any phase (such as phases A, B, and C) is directly connected to the neutral line (N line), causing the current to flow back to the power source without passing through the load.

[0084] In one embodiment of this application, please refer to Figure 3 , Figure 3 This is a schematic diagram of the structure of a microgrid testing device provided in another embodiment of this application. For example... Figure 3 As shown, relative to Figure 2 In the corresponding embodiment, the fault simulation module 15 in this embodiment includes an IO control board 151 and multiple switch components S1 to S9.

[0085] Specifically, the IO control board 151 is connected to the control module 11 and is used to control the on / off state of multiple switching components S1 to S9 according to the phase control signal.

[0086] Multiple switching components S1 to S9 are connected to different phases of the generator to form different connection paths.

[0087] In this embodiment, the IO control board 151 has been connected to the drive signals of multiple switching components S1 to S9. Therefore, the IO control board 151 can control the on / off state of the multiple switching components S1 to S9 according to the phase control signal. Since the multiple switching components S1 to S9 are connected to different phases of the generator 14 to form different connection paths, the IO control board 151 can control whether different phases of the generator 14 are connected by controlling the on / off state of the multiple switching components S1 to S9, thereby realizing the normal output voltage of the generator 14 and the prevention of grid faults such as phase-to-phase short circuit, phase-to-ground short circuit, and phase-to-neutral short circuit.

[0088] In practical applications, multiple switching components S1 to S9 can all be contactors.

[0089] In one embodiment of this application, since the aforementioned multiple switching components are used to form different connection paths associated with the generator 14, the number of switching components can be determined according to the number of phases of the generator 14, so as to form single phase connection paths corresponding to different phases of the generator 14, as well as connection paths between any two, three, or up to N. Wherein, N = the number of phases of the generator 14.

[0090] As can be seen from the above, the microgrid testing device provided in this embodiment can simulate and test various power grid faults through the fault simulation module, thereby improving the practicality of the microgrid testing device.

[0091] Please see Figure 4 , Figure 4 This is a schematic diagram of the structure of a microgrid testing device provided in another embodiment of this application. Figure 4As shown, relative to Figure 1 In a corresponding embodiment, in order to feed the AC power output by the generator 14 back to the grid and reduce the power loss of the microgrid test device 10, the microgrid test device 10 may also include a feedback module 16.

[0092] Specifically, the feedback module 16 is connected to the control module 11, the generator 14, and the voltage regulating plate 13.

[0093] In some possible embodiments, the feedback module 16 is communicatively connected to the control module 11, and the feedback module 16 is connected to the generator 14 and the voltage regulator 13 via power lines.

[0094] In some possible embodiments, the control module 11 can communicate with the fault simulation module 15 via Ethernet.

[0095] In this embodiment, the feedback module 16 is used to feed AC power back to the microgrid test device 10.

[0096] It should be noted that the specific method by which the above-mentioned feedback module 16 feeds AC power back to the microgrid test device 10 can be found in the prior art of microgrid feedback methods, and will not be elaborated here.

[0097] In one embodiment of this application, please refer to Figure 5 , Figure 5 This is a schematic diagram of the structure of a microgrid testing device provided in another embodiment of this application. For example... Figure 5 As shown, relative to Figure 4 In the corresponding embodiment, the feedback module 16 in this embodiment includes a power supply 161 and an inverter 162.

[0098] Both the power supply 161 and the inverter 162 are communicatively connected to the control module 11, and the power supply 161 and the inverter 162 are connected via power lines.

[0099] In some possible embodiments, the control module 11 can communicate with the power supply 161 and the inverter 162 via Ethernet.

[0100] In this embodiment, the feedback module 16 can feed AC power back to the microgrid test device 10 through the inverter 162.

[0101] It should be noted that the specific method by which the above-mentioned feedback module 16 feeds AC power back to the microgrid test device 10 through the inverter 162 can be referred to in the prior art for microgrid feedback methods, and will not be elaborated here.

[0102] In practical applications, power supply 161 can be a DC power source, and inverter 162 can be a grid-connected inverter or a photovoltaic inverter; no restrictions are imposed here.

[0103] In another embodiment of this application, when the motor module 12 is the load of the photovoltaic-storage microgrid system, the control module 11 can control the output power of the feedback module 16 to enable the motor module 12 to work at different power levels, so that the motor module 12 can work in various states (such as start-stop, no-load, sudden loading and unloading, etc.) to verify the stability of the photovoltaic-storage microgrid system.

[0104] Specifically, the control module 11 is also used to output a first power control signal.

[0105] The feedback module 16 is also used to adjust the output power according to the first power control signal.

[0106] Control module 11 is also used to generate a second power control signal based on the adjusted output power.

[0107] Correspondingly, the motor module 12 is also used to adjust the operating power according to the second power control signal.

[0108] In this embodiment, when the feedback module 16 receives the first power control signal, it indicates that it needs to adjust its own output power. Therefore, the feedback module 16 can adjust its own output power according to the first power control signal so that it can output the adjusted output power.

[0109] Combination Figure 5 Since the feedback module 16 includes an inverter 162, in this embodiment, when the feedback module 16 receives the first power control signal, it indicates that the output power of the inverter 162 needs to be adjusted. Therefore, the feedback module 16 can adjust the output power of the inverter 162 according to the first power control signal, so that the inverter 162 can output the adjusted output power.

[0110] In this embodiment, when the control module 11 receives the adjusted output power from the inverter 162, it can determine the adjusted output power as the load size required by the motor module 12, that is, the working power of the motor module 12 at this time. Therefore, the control module 11 can generate a second power control signal according to the adjusted output power and send the second power control signal to the motor module 12.

[0111] It should be noted that the load required by the motor module 12 refers to the load that the motor module 12 needs to withstand when it is working, which is usually expressed in terms of power.

[0112] In this embodiment, when the motor module 12 receives the second power control signal, it indicates that it needs to adjust its own operating power. Therefore, the motor module 12 can adjust its own operating power according to the second power control signal so that it can operate at the adjusted operating power.

[0113] In some possible embodiments, in order to simulate the application scenarios of motors in a real environment and control the motor module 12 to work in various states (such as start-stop, no-load, sudden loading and unloading, etc.), the aforementioned first power control signal can be generated according to the target working state of the motor module 12.

[0114] For example, when it is necessary to simulate the no-load operation of the motor module 12, that is, when the target working state of the motor module 12 is the no-load state, the control module 11 can generate a first power control signal carrying an output power of 0, so that the output power of the feedback module 16 after adjustment by the first power control signal is 0.

[0115] When it is necessary to simulate the sudden loading or unloading of the motor module 12, that is, when the target working state of the motor module 12 is a sudden loading state or a sudden unloading state, the control module 11 can generate a first power control signal to increase or decrease the output power, so that the feedback module 16 increases or decreases the output power through the first power control signal.

[0116] As can be seen from the above, the microgrid testing device provided in this embodiment can feed the AC power output by the generator back to the grid through the feedback module, thereby reducing the power consumption of the microgrid testing device.

[0117] Please see Figure 6 , Figure 6 This is a schematic diagram of the structure of a microgrid testing device provided in another embodiment of this application. Figure 6 As shown, relative to Figure 1 In the corresponding embodiment, the motor module 12 in this embodiment includes a frequency converter 121 and a motor 122.

[0118] Specifically, the frequency converter 121 is connected to the control module 11 and is used to output a power supply frequency corresponding to the frequency control signal according to the frequency control signal.

[0119] The electric motor 122 is connected to the frequency converter 121 and is used to rotate at a target speed corresponding to the power supply frequency.

[0120] In this embodiment, when the frequency inverter 121 receives the frequency control signal, it indicates that the power supply frequency of the motor 122 needs to be adjusted. Therefore, the frequency inverter 121 can adjust its own output frequency according to the frequency control signal, that is, adjust the power supply frequency of the motor 122 to output the power supply frequency corresponding to the frequency control signal.

[0121] Then, the motor 122 can rotate at the aforementioned power supply frequency, that is, rotate at the target speed corresponding to the power supply frequency.

[0122] In practical applications, motor 122 can be an asynchronous motor.

[0123] In one embodiment of this application, when the microgrid test device 10 includes a feedback module 16, since the control module 11 does not need to control the speed of the motor 122, the motor module 12 may only include the motor 122.

[0124] Please continue reading. Figure 6 In another embodiment of this application, the control module 11 includes a data acquisition component 111, a control component 112, and a communication component 113.

[0125] Specifically, the acquisition component 111 is connected to the actual power grid and the motor module 12 respectively, and is used to acquire the first operating parameters of the microgrid test device 10, the second operating parameters of the actual power grid, and the current speed of the motor module 12.

[0126] The control component 112 generates a frequency control signal and a voltage control signal based on the first operating parameter, the second operating parameter, and the current rotational speed.

[0127] The communication component 113 is connected to the motor module 12 and the voltage regulating plate 13 respectively, and is used to communicate with the motor module 12 and the voltage regulating plate 13.

[0128] It should be noted that the first operating parameters include, but are not limited to, the voltage, current and frequency of the microgrid testing device 10; the second operating parameters include, but are not limited to, the voltage, current and frequency of the actual power grid.

[0129] In this embodiment, in order to achieve synchronous control of the target voltage output by the microgrid test device 10 and the voltage of the actual power grid, so as to realize the grid-connected operation of the microgrid and the real power grid, the control component 112 can generate frequency control signals and voltage control signals according to the first operating parameters, the second operating parameters and the current rotation speed.

[0130] Specifically, the control component 112 can combine the first operating parameter, the second operating parameter and the current rotational speed to determine the adjustment range of the output voltage of the microgrid test device 10, and generate frequency control signal and voltage control signal according to the adjustment range so that the generator 14 outputs the corresponding target voltage.

[0131] In this embodiment, the communication component 113 includes multiple communication interfaces.

[0132] The communication interfaces include, but are not limited to: network port, RS485 bus interface and CAN bus interface.

[0133] It should be noted that when the microgrid testing device 10 includes a fault simulation module 15, the communication component 113 can also be connected to the fault simulation module 15 to achieve communication with the fault simulation module 15.

[0134] When the microgrid test device 10 includes a feedback module 16, the communication component 113 can also be connected to the feedback module 16 to enable communication with the feedback module 16.

[0135] Please see Figure 7 , Figure 7 This is a schematic diagram of the structure of a microgrid testing device provided in another embodiment of this application. Figure 7 As shown, relative to Figure 6 In the corresponding embodiment, the control component 112 in this embodiment includes a first control unit 1121 and a second control unit 1122.

[0136] Specifically, the first control unit 1121 is used to generate a frequency control signal based on the first operating parameter, the second operating parameter and the current rotational speed.

[0137] The second control unit 1122 is used to generate a voltage control signal based on the first operating parameter and the second operating parameter.

[0138] In this embodiment, in order to generate an accurate frequency control signal, the first control unit 1121 can determine the adjustment range of the motor 122's speed based on the first operating parameter, the second operating parameter, and the current speed, and generate a corresponding frequency control signal based on the adjustment range.

[0139] In order to generate an accurate voltage control signal, the first control unit 1121 can determine the adjustment range of the voltage output by the generator 14 according to the first operating parameter and the second operating parameter, and generate a corresponding voltage control signal according to the adjustment range.

[0140] As can be seen from the above, the microgrid testing device provided in this embodiment can achieve accurate control over the voltage output by the microgrid testing device and the frequency of that voltage.

[0141] An embodiment of this application also provides a microgrid testing system; please refer to [link / reference]. Figure 8 , Figure 8 This is a schematic diagram of the structure of a microgrid testing system provided in one embodiment of this application. Figure 8 As shown, the microgrid testing system 1 includes a microgrid testing device 10 and a host computer 20, which are communicatively connected to the microgrid testing device 10. The microgrid testing device 10 can be... Figures 1 to 7 The microgrid testing device 10 in any of the corresponding embodiments. The host computer 10 includes, but is not limited to, devices such as laptops, desktop computers, and computers.

[0142] In some possible embodiments, the host computer 20 and the microgrid testing device 10 can communicate via Ethernet.

[0143] In this embodiment, the host computer 20 is used to send various control commands to the microgrid testing device 10.

[0144] The microgrid testing device 10 is used to execute setting operations corresponding to various control commands.

[0145] It should be noted that the host computer 20 integrates the control algorithms corresponding to each test item that the microgrid test device 10 can perform. Therefore, the host computer 20 can send control commands corresponding to each test item to the control module 11 in the microgrid test device 10 to achieve the desired effect of each test item.

[0146] In this embodiment, the various test items include, but are not limited to: grid voltage and frequency fluctuation test, voltage and frequency protection test (such as grid over-voltage and under-frequency protection), high and low voltage ride-through (i.e., low voltage ride-through and high voltage ride-through) test, short circuit test, and start-stop test, etc.

[0147] When the host computer 20 needs to implement test items for grid short circuit and start-stop control, the microgrid test device 10 may include a fault simulation module 15.

[0148] For example, please refer to Figure 9 , Figure 9 This is an execution flowchart of various test items provided in an embodiment of this application. For example... Figure 9 As shown, the various test items include: grid voltage and frequency fluctuation test, voltage and frequency protection test, high and low voltage surge test, short circuit test, and start-up and shutdown test.

[0149] When the test item is the grid voltage and frequency fluctuation test, the host computer can send the pre-stored expected voltage-time curve and expected frequency-time curve to the control module in the microgrid test device. Then, the control module can control the frequency converter and voltage regulator in the motor module based on the expected voltage-time curve and expected frequency-time curve to realize the grid voltage and frequency fluctuation test.

[0150] When the test item is voltage and frequency protection test, the host computer can send the pre-stored expected voltage and expected frequency to the control module in the microgrid test device. Then, the control module can control the frequency converter and voltage regulator in the motor module based on the expected voltage and expected frequency to realize the voltage and frequency protection test.

[0151] When the test item is high-low voltage test, the host computer can send the pre-stored expected voltage-time curve to the control module in the microgrid test device. Then, the control module can control the voltage regulator based on the expected voltage-time curve to realize the high-low voltage test.

[0152] When the test item is a short circuit test, the host computer can send the pre-stored switch control logic to the control module in the microgrid test device. Then, the control module can control the fault simulation module based on the switch control logic to realize the short circuit test.

[0153] When the test item is a start-stop test, the host computer can send the pre-stored start-stop control logic to the control module in the microgrid test device. Then, the control module can control the frequency converter and fault simulation module in the motor module based on the start-stop control logic to realize the start-stop test.

[0154] In this embodiment, the control commands include, but are not limited to, frequency control commands, voltage control commands, and fault simulation commands. The fault simulation commands include, but are not limited to, normal voltage output commands, phase-to-ground short-circuit commands, phase-to-N short-circuit commands, and phase-to-phase short-circuit commands.

[0155] In this embodiment, the host computer 20 can send various control commands to the control module 11 in the microgrid testing device 10.

[0156] After receiving the various control commands mentioned above, the control module 11 in the microgrid testing device 10 can generate corresponding control signals based on these commands and send each control signal to the motor module 12, the voltage regulator 13, and / or the fault simulation module 15, so that the motor module 12, the voltage regulator 13, and / or the fault simulation module 15 can perform corresponding set operations based on the corresponding control signals. The respective set operations can be configured according to actual needs and are not limited here.

[0157] The following section will describe in detail how the microgrid test device 10 executes the setting operations corresponding to the frequency control commands and voltage control commands, respectively:

[0158] Relevant personnel can input the desired voltage into the host computer 20. Then, the host computer 20 can generate a voltage control command based on the desired voltage and send the voltage control command to the control module 11 in the microgrid test device 10.

[0159] After receiving the voltage control command, the control module 11 can extract the desired voltage from the voltage control command.

[0160] The control module 11 can also collect the current output voltage of the generator 14 through the voltage regulating plate 13.

[0161] Then, the control module 11 can compare the desired voltage with the current output voltage.

[0162] In this embodiment, when the control module 11 detects that the current output voltage is different from the expected voltage, it indicates that the voltage output by the microgrid test device 10 needs to be adjusted. Therefore, the control module 11 can generate a voltage control signal by combining the current output voltage and the expected voltage, and send the voltage control signal to the voltage regulating board 13.

[0163] After receiving the voltage control signal, the voltage regulating plate 13 can adjust the excitation current of the generator 14 based on the voltage control signal so that the generator 14 outputs the target voltage, i.e. the desired voltage, corresponding to the adjusted excitation voltage.

[0164] It should be noted that when the control module 11 detects that the current output voltage is the same as the expected voltage, it means that there is no need to adjust the voltage output of the microgrid test device 10. Therefore, the control module 11 can stop the adjustment operation of the voltage output of the microgrid test device 10.

[0165] Based on this, the microgrid testing device 10 has completed the setting operation corresponding to the voltage control command.

[0166] Relevant personnel can input the desired frequency into the host computer 20. Then, the host computer 20 can generate a frequency control command based on the desired frequency and send the frequency control command to the control module 11 in the microgrid test device 10.

[0167] After receiving the frequency control command, the control module 11 can extract the desired frequency from the frequency control command.

[0168] The control module 11 can also collect the current power supply frequency of the motor module 12.

[0169] Then, the control module 11 can compare the desired frequency with the current power supply frequency.

[0170] In this embodiment, when the control module 11 detects that the current power supply frequency is different from the desired frequency, it indicates that the frequency of the voltage output by the microgrid test device 10 needs to be adjusted. Therefore, the control module 11 can generate a frequency control signal by combining the current power supply frequency and the desired frequency, and send the frequency control signal to the motor module 12.

[0171] After receiving the frequency control signal, the motor module 12 can adjust its own power supply frequency based on the frequency control signal, so that it can rotate at the adjusted power supply frequency, that is, rotate at the desired frequency, or rotate based on the adjusted speed.

[0172] In some possible embodiments, when the motor module 12 includes a frequency converter 121 and a motor 122, upon receiving the aforementioned frequency control signal, the frequency converter 121 can adjust its own output frequency according to the frequency control signal, thereby adjusting the power supply frequency of the motor 122 to output the desired frequency corresponding to the frequency control signal. Based on this, the motor 122 can rotate at the desired frequency, that is, rotate at the target speed corresponding to the desired frequency.

[0173] It should be noted that when the control module 11 detects that the current power supply frequency is the same as the desired frequency, it means that there is no need to adjust the frequency of the voltage output by the microgrid test device 10. Therefore, the control module 11 can stop the frequency adjustment operation of the voltage output by the microgrid test device 10.

[0174] Based on this, the microgrid test device 10 has completed the setting operation corresponding to the frequency control command.

[0175] In the above embodiments, the descriptions of each embodiment have different focuses. For parts that are not described in detail or recorded in a certain embodiment, refer to the relevant descriptions of other embodiments.

[0176] The above-described embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this application, and should all be included within the protection scope of this application.

Claims

1. A microgrid testing device, characterized in that, include: The control module (11) is used to output frequency control signals and voltage control signals; The motor module (12) is connected to the control module (11) and is used to adjust the power supply frequency according to the frequency control signal and rotate at the adjusted power supply frequency. The voltage regulating plate (13) is connected to the control module (11) and the generator (14) respectively, and is used to output the corresponding excitation current according to the voltage control signal; The generator (14) is connected to the shaft of the motor module (12) and is used to generate electricity and output the target voltage under the action of the excitation current and the drive of the motor module (12).

2. The microgrid testing device according to claim 1, characterized in that, The motor module (12) includes: The frequency converter (121) is connected to the control module (11) and is used to output a power supply frequency corresponding to the frequency control signal according to the frequency control signal; An electric motor (122) is connected to the frequency converter (121) and is used to rotate at a target speed corresponding to the power supply frequency at the power supply frequency.

3. The microgrid testing device according to claim 1, characterized in that, The control module (11) includes: The acquisition component (111) is connected to the actual power grid and the motor module (12) respectively, and is used to acquire the first working parameters of the microgrid test device (10), the second working parameters of the actual power grid, and the current speed of the motor module (12); The control component (112) generates the frequency control signal and the voltage control signal based on the first operating parameter, the second operating parameter and the current rotational speed; The communication component (113) is connected to the motor module (12) and the voltage regulating plate (13) respectively, and is used to communicate with the motor module (12) and the voltage regulating plate (13).

4. The microgrid testing device according to claim 3, characterized in that, The control component (112) includes: The first control unit (1121) is used to generate the frequency control signal based on the first operating parameter, the second operating parameter and the current rotation speed; The second control unit (1122) is used to generate the voltage control signal according to the first operating parameter and the second operating parameter.

5. The microgrid testing device according to any one of claims 1-4, characterized in that, The microgrid testing device (10) also includes a fault simulation module (15), which is connected to the control module (11), the voltage regulating plate (13) and the generator (14) respectively. The control module (11) is also used to output phase control signals; The fault simulation module (15) is used to control each phase of the generator (14) according to the phase control signal to simulate different power grid faults.

6. The microgrid testing device according to claim 5, characterized in that, The fault simulation module (15) includes: an IO control board (151) and multiple switch components (S1~S9). The IO control board (151) is connected to the control module (11) and is used to control the on / off state of the plurality of switching components (S1~S9) according to the phase control signal; The plurality of switching components (S1~S9) are connected to different phases of the generator (14) to form different connection paths.

7. The microgrid testing device according to claim 1, characterized in that, The microgrid testing device (10) also includes a feedback module (16), which is connected to the control module (11), the generator (14) and the voltage regulator (13) respectively. The feedback module (16) is used to feed AC power back to the microgrid test device (10).

8. The microgrid testing device according to claim 7, characterized in that, The control module (11) is also used to output a first power control signal; The feedback module (16) is also used to adjust the output power according to the first power control signal; The control module (11) is also used to generate a second power control signal based on the adjusted output power; Accordingly, the motor module (12) is also used to adjust the operating power according to the second power control signal.

9. The microgrid testing device according to claim 7, characterized in that, The feedback module (16) includes a power supply (161) and an inverter (162).

10. A microgrid testing system, characterized in that, Includes a host computer (20) and a microgrid testing device (10) as described in any one of claims 1 to 9; The host computer (20) is communicatively connected to the microgrid testing device (10) and is used to send control commands corresponding to each test item to the microgrid testing device (10); The microgrid testing device (10) is used to execute the setting operations corresponding to each of the control commands.

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