Test method, device, system, and storage medium for energy-consuming device

Abstract

The present application relates to the technical field of electric power engineering, and discloses a test method, device and system of an energy consumption device and a storage medium. When the system is running in a normal power generation mode, the input power of a power electronic power generation system or a power electronic power transmission system is controlled to be unchanged, and the active power sent to the power grid is reduced, or when the DC side of the system is unloaded, the active power absorbed from the power grid by the power electronic power generation system or the power electronic power transmission system is increased. Without artificially creating a fault, surplus power is generated by the power electronic power generation system or the power electronic power transmission system, which triggers the energy consumption device to start. Then, in a real live scenario, the energy consumption device is tested for energy consumption to determine whether the energy consumption device can dissipate the surplus power generated by the power electronic power generation system or the power electronic power transmission system, thereby obtaining an energy consumption test result, so as to optimize and adjust the energy consumption device according to the energy consumption test result.

Description

Technical Field

[0001] This invention relates to the field of power engineering technology, specifically to test methods, apparatus, systems, and storage media for energy-consuming devices. Background Technology

[0002] When a severe fault occurs in the power grid connected to a power electronic generation or transmission system, the system is unable to transmit power from its input side to the grid. This causes a voltage rise in the system, potentially leading to overvoltage and damage to equipment. Therefore, energy dissipation devices are needed to dissipate the power that the system cannot transmit during the fault.

[0003] Before being put into formal use, energy-consuming devices require extensive testing to verify their logic and functionality. Since these devices are designed to handle grid fault conditions, simulating a fault in the grid under actual energized conditions for testing could easily disrupt grid stability and incur additional hardware costs. For these reasons, current technologies rely on simulation testing to verify the logic and functionality of energy-consuming devices. However, simulation testing cannot fully replicate the complexities of real-world power transmission scenarios.

[0004] Therefore, how to test the energy-consuming devices of power electronic power generation systems or power electronic power transmission systems in real power transmission scenarios has become a critical issue that urgently needs to be addressed. Summary of the Invention

[0005] In view of this, the present invention provides a testing method, apparatus, system and storage medium for energy-consuming devices, in order to solve the problem that the prior art is difficult to test energy-consuming devices in real power transmission scenarios.

[0006] In a first aspect, the present invention provides a testing method for an energy-consuming device, applied to a power electronic power generation system or a power electronic transmission system including the energy-consuming device, wherein the output terminal of the power electronic power generation system or the power electronic transmission system is connected to the power grid, and the method includes:

[0007] If the power electronic power generation system or power electronic transmission system is operating in normal power generation mode, the input power of the power electronic power generation system or power electronic transmission system is kept constant, and the active power sent from the power electronic power generation system or power electronic transmission system to the grid is reduced in order to control the opening of energy-consuming devices.

[0008] Alternatively, if the DC side of the power electronic power generation system or power electronic transmission system is unloaded and operates in reactive power compensation mode, the active power absorbed by the power electronic power generation system or power electronic transmission system from the grid is increased to control the opening of energy-consuming devices.

[0009] Energy consumption tests were conducted using energy-consuming devices to obtain the test results.

[0010] Beneficial Effects: When the system is operating in normal power generation mode, this application controls the input power of the power electronic power generation system or power electronic transmission system to remain constant while reducing its active power output to the grid. Alternatively, when the DC side of the system is unloaded, it increases the active power absorbed by the power electronic power generation system or power electronic transmission system from the grid. Without artificially creating faults, this allows the power electronic power generation system or power electronic transmission system to generate surplus power, thus triggering the activation of the energy dissipation device. Furthermore, in a real energized scenario, an energy dissipation test is conducted on the energy dissipation device to determine whether it can dissipate the surplus power generated by the power electronic power generation system or power electronic transmission system. The energy dissipation test results are then obtained, allowing for optimization and adjustment of the energy dissipation device based on these results.

[0011] In one alternative implementation, the power electronic power generation system or power electronic power transmission system includes a voltage control loop, which includes a DC voltage control loop or a submodule average voltage control loop.

[0012] The DC voltage control loop is used to adjust the active current output by the power electronic power generation system or power electronic transmission system according to the DC voltage of the power electronic power generation system or power electronic transmission system, so as to regulate the active power transmitted to the grid by the power electronic power generation system or power electronic transmission system.

[0013] The submodule average voltage control loop is used to adjust the active current output by the power electronic power generation system or power electronic transmission system according to the submodule average voltage of the power electronic power generation system or power electronic transmission system, so as to regulate the active power transmitted to the grid by the power electronic power generation system or power electronic transmission system; wherein, the reference direction of the active current is from the power electronic power generation system or power electronic transmission system to the grid.

[0014] In one alternative implementation, reducing the active power delivered to the grid by a power electronic generation system or power electronic transmission system includes:

[0015] Close the DC voltage control loop or the submodule average voltage control loop, and actively reduce the active current reference command value of the power electronic power generation system or power electronic transmission system in normal power generation mode.

[0016] Beneficial effects: When energy consumption tests are required, this application suppresses the active power output of the power electronic generation system or power electronic transmission system by closing the DC voltage control loop or the submodule average voltage control loop and actively reducing the active current reference command value of the power electronic generation system or power electronic transmission system in normal generation mode. This eliminates the need to artificially create short-circuit faults, allowing the power electronic generation system or power electronic transmission system to generate surplus power to trigger the energy consumption device and conduct tests on it.

[0017] In one alternative implementation, increasing the active power absorbed by the power electronic generation system or power electronic transmission system from the power grid includes:

[0018] Close the DC voltage control loop or the submodule average voltage control loop, and actively reduce the active current reference command value of the power electronic power generation system or power electronic transmission system when it is under no-load on the DC side and operating in reactive power compensation mode.

[0019] Beneficial effects: When energy consumption tests are required, this application closes the DC voltage control loop or the submodule average voltage control loop and reduces the active current reference command value of the power electronic generation system or power electronic transmission system, enabling the grid to actively transfer active power to the power electronic generation system or power electronic transmission system. This eliminates the need to artificially create short-circuit faults to generate surplus power in the power electronic generation system or power electronic transmission system, thereby triggering the energy consumption device to start and conduct tests on it.

[0020] In one alternative implementation, controlling the power-consuming device to turn on includes:

[0021] When the DC voltage or average voltage of a submodule in a power electronic power generation system or power electronic transmission system exceeds a voltage threshold, the energy-consuming device is activated.

[0022] Beneficial effects: After reducing the active power sent to the grid by the power electronic power generation system or the power electronic transmission system, or after increasing the active power absorbed from the grid by the power electronic power generation system or the power electronic transmission system, this application monitors the DC voltage of the system or the average voltage of the system sub-modules. When the DC voltage or the average voltage of the sub-modules exceeds the voltage threshold, the energy consumption device can be turned on to conduct an energy consumption test without artificially creating a short circuit fault.

[0023] In one alternative implementation, after obtaining the energy consumption test results, the method further includes:

[0024] The DC voltage control loop or the submodule average voltage control loop is activated, and the active current reference command value of the power electronic power generation system or the power electronic transmission system is stopped from being actively reduced. The output of the DC voltage control loop or the submodule average voltage control loop is used as the active current reference command value.

[0025] Beneficial effects: After the energy consumption test is completed, this application restarts the DC voltage control loop or the submodule average voltage control loop to restore the balance control between the active power input to the system and the grid-connected power of the system, so that the DC voltage of the system or the average voltage of the submodule decreases and returns to the rated value, thereby shutting down the energy consumption device.

[0026] Secondly, the present invention provides a test apparatus for an energy-consuming device, applied to a power electronic power generation system or a power electronic transmission system including an energy-consuming device, wherein the output terminal of the power electronic power generation system or the power electronic transmission system is connected to the power grid, and the test apparatus includes:

[0027] The control module is used to control the input power of the power electronic power generation system or power electronic transmission system to remain unchanged and reduce the active power sent to the grid by the power electronic power generation system or power electronic transmission system in normal power generation mode, so as to control the opening of energy-consuming devices; or, if the DC side of the power electronic power generation system or power electronic transmission system is unloaded and operates in reactive power compensation mode, increase the active power absorbed by the power electronic power generation system or power electronic transmission system from the grid, so as to control the opening of energy-consuming devices.

[0028] The processing module is used to conduct energy consumption tests using energy-consuming devices and obtain the test results.

[0029] Thirdly, the present invention provides a power electronic power generation system, the power generation system comprising: a first memory and a first processor, the first memory and the first processor being communicatively connected to each other, the first memory storing computer instructions, and the first processor executing the computer instructions to perform the test method of the energy-consuming device of the first aspect or any corresponding embodiment described above.

[0030] Fourthly, the present invention provides a power electronic transmission system, the transmission system comprising: a second memory and a second processor, the second memory and the second processor being communicatively connected to each other, the second memory storing computer instructions, and the second processor executing the computer instructions to perform the test method of the energy-consuming device of the first aspect or any corresponding embodiment described above.

[0031] Fifthly, the present invention provides a computer-readable storage medium storing computer instructions for causing a computer to perform a test method for an energy-consuming device according to the first aspect or any corresponding embodiment thereof. Attached Figure Description

[0032] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0033] Figure 1 This is a schematic diagram of the structure of a centralized energy-consuming device according to an embodiment of the present invention;

[0034] Figure 2 This is a schematic diagram of the structure of a submodule for configuring a power-consuming resistor according to an embodiment of the present invention;

[0035] Figure 3 This is a schematic flowchart of a test method for an energy-consuming device according to an embodiment of the present invention;

[0036] Figure 4 This is a schematic flowchart of a test method for another energy-consuming device according to an embodiment of the present invention;

[0037] Figure 5 This is a control block diagram of a test system for an energy-consuming device according to an embodiment of the present invention;

[0038] Figure 6 This is a control block diagram of a test system for another energy-consuming device according to an embodiment of the present invention;

[0039] Figure 7A This is a schematic diagram of the DC side unloaded structure of a system according to an embodiment of the present invention;

[0040] Figure 7B This is a schematic diagram of the DC side unloaded structure of another system according to an embodiment of the present invention;

[0041] Figure 8 This is a structural block diagram of an energy consumption testing device according to an embodiment of the present invention;

[0042] Figure 9 This is a schematic diagram of the hardware structure of the power electronic power generation system according to an embodiment of the present invention;

[0043] Figure 10 This is a schematic diagram of the hardware structure of the power electronic transmission system according to an embodiment of the present invention. Detailed Implementation

[0044] 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.

[0045] In power electronic generation and transmission systems, energy dissipation devices play a crucial role in ensuring the normal operation of the system. Taking the offshore wind power flexible DC transmission system as an example, the flexible DC transmission system is used to transmit offshore DC wind power to the onshore AC power grid. When a short circuit or other serious fault occurs in the onshore AC power grid, the power generated by the offshore wind power cannot be transmitted to the grid through the flexible DC system, causing the DC voltage of the flexible DC transmission system to rise. In order to avoid damage to the equipment caused by the flexible DC overvoltage, the power that the flexible DC transmission system cannot transmit during the fault period needs to be dissipated.

[0046] like Figure 1 As shown, related technologies typically configure centralized energy dissipation devices on the DC side of onshore converter stations. These devices include energy-dissipating resistors to dissipate power that cannot be delivered during system faults. Alternatively, as... Figure 2 As shown, the related technology also dissipates the power that cannot be delivered during system failures by using the energy-dissipating resistors integrated into the converter valve submodule of the Modular Multilevel Converter (MMC).

[0047] In power engineering, detailed tests are conducted on any critical electrical equipment before commissioning to verify its logic and functionality. Ideally, simulation tests should be performed first, followed by actual live-line tests. However, for energy-consuming devices designed to handle AC grid faults, the conventional approach is to create an AC fault. But creating an AC fault in a real-world energized grid is extremely difficult and impractical. Creating an artificial short-circuit AC fault in the local grid could easily disrupt its stable operation and require additional testing hardware costs. Therefore, current logic and functional tests for energy-consuming devices are performed through simulation verification, but simulations severely fall short of fully capturing real-world system scenarios.

[0048] According to an embodiment of the present invention, a test method embodiment for an energy-consuming device is provided. It should be noted that the steps shown in the flowchart in the accompanying drawings can be executed in a computer system such as a set of computer-executable instructions. Furthermore, although a logical order is shown in the flowchart, in some cases, the steps shown or described may be executed in a different order than that shown here.

[0049] This embodiment provides a test method for an energy-consuming device, which can be used in power electronic power generation systems or power electronic transmission systems, such as offshore wind power flexible direct transmission systems. The output terminal of the power electronic power generation system or power electronic transmission system is connected to the power grid. Figure 3 This is a flowchart of a test method for an energy-consuming device according to an embodiment of the present invention, such as... Figure 3 As shown, the process includes the following steps:

[0050] Step S301: If the power electronic power generation system or power electronic transmission system is operating in normal power generation mode, control the input power of the power electronic power generation system or power electronic transmission system to remain unchanged, and reduce the active power sent to the grid by the power electronic power generation system or power electronic transmission system to control the energy-consuming device to start.

[0051] Specifically, the output of the power electronic power generation system or power electronic transmission system is connected to the power grid. When the power electronic power generation system or power electronic transmission system is operating in normal power generation mode, it means that the power electronic power generation system or power electronic transmission system is normally transmitting active power to the power grid. At this time, by keeping the input power of the power electronic power generation system or power electronic transmission system unchanged and reducing the active power it sends to the power grid, the power electronic power generation system or power electronic transmission system generates surplus power, thereby triggering the energy consumption device to start without artificially creating a short circuit fault.

[0052] Step S302: If the DC side of the power electronic power generation system or the power electronic transmission system is unloaded and operates in reactive power compensation mode, increase the active power absorbed by the power electronic power generation system or the power electronic transmission system from the grid to control the opening of energy-consuming devices.

[0053] Specifically, since the output of the power electronic power generation system or power electronic transmission system is connected to the power grid, if the DC side of the power electronic power generation system or power electronic transmission system is unloaded and the power electronic power generation system or power electronic transmission system operates in reactive power compensation mode, then by actively increasing the active power absorbed by the power electronic power generation system or power electronic transmission system from the power grid, the power electronic power generation system or power electronic transmission system generates surplus power, thereby triggering the energy consumption device to start without artificially creating a short circuit fault.

[0054] In this embodiment, when the power electronic power generation system or power electronic transmission system is operating in normal power generation mode, the above step S301 is executed, or when the DC side of the power electronic power generation system or power electronic transmission system is unloaded, the above step S302 is executed to control the power electronic power generation system or power electronic transmission system to generate surplus power so as to control the energy consumption device to turn on.

[0055] This embodiment, without artificially creating faults, adjusts the output power of the power electronic generation system or power electronic transmission system, or the power transmitted from the grid to the power electronic generation system or power electronic transmission system, to generate surplus power in the power electronic generation system or power electronic transmission system. This allows for the control of energy-consuming devices to start upon detection of surplus power in the power electronic generation system or power electronic transmission system.

[0056] It should be noted that the surplus power generated by the power electronic generation system or power electronic transmission system should be within the preset power range. The surplus power should not be too small, otherwise the energy-consuming device will not be triggered to start; at the same time, the surplus power should not be too large to prevent damage to the system equipment. The preset power range can be set according to the actual parameters of the energy-consuming device.

[0057] Step S303: Conduct an energy consumption test using an energy-consuming device to obtain the energy consumption test results.

[0058] Specifically, after the energy-consuming device is turned on, test data of the electronic power generation system or power electronic transmission system during the energy consumption test are collected to obtain the input power of the input end of the electronic power generation system or power electronic transmission system, the output power of the output end, and the energy consumption power of the energy-consuming device, and then the logic and functionality of the energy-consuming device are tested.

[0059] In some embodiments, it is determined whether the power consumption of the energy-consuming device is greater than or equal to the power difference between the input power at the input terminal and the output power at the output terminal. If the power consumption is greater than or equal to the power difference, it indicates that the energy-consuming device is sufficient to dissipate the surplus power generated by the power electronic power generation system or the power electronic power transmission system, and the logic and functionality of the energy-consuming device are normal. If the power consumption is less than the power difference, it indicates that the performance of the energy-consuming device still needs to be adjusted.

[0060] The testing method for the energy-consuming device provided in this embodiment, when the system is operating in normal power generation mode, controls the input power of the power electronic power generation system or power electronic transmission system to remain constant while reducing its active power sent to the grid. Alternatively, when the DC side of the system is unloaded, it increases the active power absorbed by the power electronic power generation system or power electronic transmission system from the grid. Without artificially creating faults, this causes the power electronic power generation system or power electronic transmission system to generate surplus power, thus triggering the energy-consuming device to start. Then, in a real energized scenario, an energy-consuming test is conducted on the energy-consuming device to determine whether it can dissipate the surplus power generated by the power electronic power generation system or power electronic transmission system. The energy-consuming test results are then obtained, allowing for optimization and adjustment of the energy-consuming device based on these results.

[0061] This embodiment provides a test method for an energy-consuming device, which can be used in power electronic power generation systems or power electronic transmission systems, such as offshore wind power flexible direct transmission systems. The output terminal of the power electronic power generation system or power electronic transmission system is connected to the power grid. Figure 4 This is a flowchart of a test method for an energy-consuming device according to an embodiment of the present invention, such as... Figure 4 As shown, the process includes the following steps:

[0062] Step S401: If the power electronic power generation system or power electronic transmission system is operating in normal power generation mode, the input power of the power electronic power generation system or power electronic transmission system is kept constant, and the active power sent to the grid by the power electronic power generation system or power electronic transmission system is reduced, so as to control the energy-consuming device to start.

[0063] Specifically, the power electronic generation system or power electronic transmission system includes a voltage control loop, which is used to regulate the active current output by the power electronic generation system or power electronic transmission system, thereby regulating the active power transmitted from the power electronic generation system or power electronic transmission system to the power grid. The reference direction of the active current is from the power electronic generation system or power electronic transmission system towards the power grid.

[0064] In some embodiments, such as Figure 5 As shown, the voltage control loop can be a DC voltage control loop, which is used to control the DC voltage of the power electronic power generation system or the power electronic transmission system. Reference command for adjusting the active current output of a power electronic generation system or power electronic transmission system. This is used to regulate the active power transmitted to the grid by power electronic generation or transmission systems. It should be noted that DC voltage... This can be obtained by measuring the voltage at both ends of the DC transmission cable of a power electronic power generation system or a power electronic transmission system. Taking an offshore wind power flexible DC transmission system as an example, see again... Figure 2 By measuring the voltage at both ends of the DC submarine cable, the DC voltage can be monitored in real time. .

[0065] Specifically, see again Figure 5 When no energy consumption test is required, the DC voltage control loop's Test=0, i.e., switch Ctrl=0, and the DC voltage control loop is in the open state. The proportional-integral (PI) regulator is based on DC voltage. and reference DC voltage The voltage deviation between them is adjusted using PI regulation, thereby regulating the active current reference command of the power electronic generation system or power electronic transmission system. In order to maintain DC voltage Stability.

[0066] It should be noted that when energy consumption testing is not required, the adjustment target of the PI regulator is to reduce the DC voltage. Stabilized at the reference DC voltage The input to the PI regulator is a DC voltage, thus eliminating the deviation between the two. and reference DC voltage The voltage deviation between the components is adjusted by the proportional (P) and integral (I) elements to regulate the active current reference command of the power electronic generation system or power electronic transmission system. For specific adjustment procedures, please refer to the detailed description of the relevant technologies, which will not be repeated here.

[0067] In some embodiments, such as Figure 6 As shown, the voltage control loop can be a submodule average voltage control loop. This loop is used to adjust the active current output by the power electronic generation system or power electronic transmission system based on the average voltage of the submodules, thereby regulating the active power delivered to the grid. The reference direction of the active current is from the power electronic generation system or power electronic transmission system towards the grid.

[0068] It should be noted that power electronic power generation systems or power electronic transmission systems have multiple sub-modules, such as converter valve sub-modules. Taking an offshore wind power flexible direct transmission system as an example, see again... Figure 2 The inverter-side MMC of this offshore wind power flexible direct transmission system has a converter valve containing distributed energy dissipation devices. The converter valve has multiple sub-modules SM, and each sub-module SM is equipped with energy dissipation devices. The average voltage of the sub-modules is obtained by monitoring the voltage of all sub-modules of the inverter-side MMC and performing average calculation. See you again. Figure 6 When no energy consumption test is required, the Test=0 setting of the submodule average voltage control loop, i.e., switch Ctrl=0, means the submodule average voltage control loop is in the open state. The PI regulator is based on the submodule average voltage. and reference average voltage The voltage deviation between them is adjusted using PI regulation, thereby regulating the active current reference command of the power electronic generation system or power electronic transmission system. In order to maintain the average voltage of the submodule The stability of the submodule. It should be noted that when energy consumption testing is not required, the adjustment target of the PI regulator is to stabilize the average voltage of the submodule. Stabilized at the reference average voltage The adjustment process is carried out in the vicinity to eliminate the deviation between the two. For details on the adjustment process, please refer to the detailed description of the relevant technology. It will not be repeated here.

[0069] As an example, for ease of understanding, the control scheme of this application will be described in detail below using a DC voltage control loop as an example. For the specific control process and working principle of the submodule average voltage control loop, please refer to the relevant description of the DC voltage control loop below.

[0070] Specifically, see again Figure 5 Power electronic generation systems or power electronic transmission systems will also be based on reactive power. and reference reactive power The power deviation between the two is PI-regulated to adjust the reactive current of the system. For specific adjustment procedures, please refer to the detailed description of the relevant technologies, which will not be repeated here.

[0071] In some embodiments, the power electronic generation system or power electronic transmission system includes a Multiphase Controlled Modular Module (MMC), which is a key device in the transmission system and is mainly used to realize the mutual conversion between direct current (DC) and alternating current (AC). Taking an offshore wind power flexible DC transmission project as an example, the MMC includes multiple three-phase arms, where each phase arm is divided into an upper arm and a lower arm, and each arm includes multiple sub-modules. Furthermore, each sub-module includes an Insulated Gate Bipolar Transistor (IGBT) and energy storage devices (such as energy storage capacitors), etc. By controlling the switching on and off of the IGBT, the capacitor is connected or disconnected, thereby outputting different voltage levels.

[0072] Specifically, see again Figure 5 Active current reference command and reactive current reference value As the inner loop control element for the control command input current, the d-axis component of the AC voltage reference value is obtained. and q-axis components This achieves current decoupling control. The specific principles of the grid-side converter can be found in the detailed descriptions of relevant technologies, and will not be elaborated upon here.

[0073] Specifically, see again Figure 5 For the d-axis reference voltage q-axis reference voltage Perform coordinate transformation to obtain the three-phase fundamental frequency reference voltage. (a-phase reference voltage) (Phase B reference voltage) (C-phase reference voltage). To suppress the second-harmonic circulating current of the converter valve, a circulating current suppression control is also configured. The circulating current suppression control outputs a three-phase second-harmonic negative-sequence reference voltage: (A-phase second frequency harmonic reference voltage) (Phase B frequency doubled reference voltage) (C-phase second harmonic reference voltage), the specific process can be found in the descriptions of relevant technologies, and will not be repeated here. Based on three-phase fundamental frequency reference voltage , , and three-phase second-harmonic negative sequence reference voltage , , Nearest Level Modulation (NLM) is performed to determine the number of submodules corresponding to each phase arm of the MMC. (Number of sub-modules required for the upper arm of phase a) (Number of sub-modules required for the lower arm of phase a) (Number of sub-modules required for phase b upper arm) (Number of sub-modules required for the lower arm of phase b) (Number of sub-modules required for the C-phase upper arm) (The number of submodules required for the lower arm of phase C). Then, based on the number of submodules, drive control is performed on each submodule of the MMC. For details, please refer to the detailed description of the relevant technology, which will not be repeated here.

[0074] Specifically, see again Figure 5 , The module is used to input the d-axis reference voltage. q-axis reference voltage The transformation from the dq coordinate system to the three-phase stationary coordinate system, i.e., the inverse Parker transformation, converts the voltage signal on the dq axis into AC reference signals for phases a, b, and c, thus adapting the three-phase output of the system.

[0075] In this embodiment of the application, when energy consumption testing is not required, a DC voltage control loop is used to control the DC voltage. and reference DC voltage The voltage deviation between the inputs is fed into a proportional-integral (PI) regulator, which then adjusts the active current reference command of the power electronic generation or transmission system. This is to balance the input power and output active power of a power electronic generation system or power electronic transmission system, thereby maintaining the DC voltage at the input terminal. Stability.

[0076] In some embodiments, the DC voltage control loop is shut down, and the active current of the power electronic power generation system or the power electronic transmission system is actively reduced, thereby reducing the active power sent to the grid by the power electronic power generation system or the power electronic transmission system.

[0077] Specifically, see again Figure 5 When an energy consumption test is required, the DC voltage control loop is set to Test=1, the switch Ctrl=1, and the DC voltage control loop is in the closed state. Simultaneously, the first control command is issued to actively reduce the active current reference command value of the power electronic generation system or power electronic transmission system in normal generation mode (the reference direction of the active current is from the power electronic generation system or power electronic transmission system to the grid, and the active current reference command value is positive at this time), thus reducing the active power output at the output terminal of the power electronic generation system or power electronic transmission system. As a result, the input power and output power of the power electronic generation system or power electronic transmission system are no longer balanced, generating surplus power and triggering the energy consumption device to start.

[0078] It should be noted that, see again Figure 5 The reduction in active current of a power electronic power generation system or a power electronic transmission system can be a preset current value. The preset current The specific size can be set according to actual needs.

[0079] In this embodiment, when an energy consumption test is required, the DC voltage control loop is closed, and the active current reference command value of the power electronic generation system or power electronic transmission system in normal generation mode is actively reduced, thereby suppressing the active power output to the grid by the power electronic generation system or power electronic transmission system. This eliminates the need to artificially create a short-circuit fault, allowing the power electronic generation system or power electronic transmission system to generate surplus power to trigger the energy consumption device and conduct the test.

[0080] Step S402: If the DC side of the power electronic power generation system or the power electronic transmission system is unloaded and operates in reactive power compensation mode, increase the active power absorbed by the power electronic power generation system or the power electronic transmission system from the grid to control the opening of energy-consuming devices.

[0081] Specifically, such as Figure 7A and Figure 7B As shown, when the DC side of the power electronic power generation system or power electronic transmission system is unloaded, the power electronic power generation system or power electronic transmission system operates in reactive power compensation mode. At this time, by actively increasing the active power absorbed by the power electronic power generation system or power electronic transmission system from the grid, without artificially creating faults, the power electronic power generation system or power electronic transmission system generates surplus power, so as to trigger the energy consumption device to start.

[0082] In some embodiments, see again Figure 5When the active power transmitted from the grid to the power electronic generation system or power electronic transmission system increases, Test=1 in the DC voltage control loop, switch Ctrl=1, and the DC voltage control loop is in the closed state. Simultaneously, a second control command is issued to reduce the active current reference command value of the power electronic generation system or power electronic transmission system operating in reactive power compensation mode under DC no-load conditions. This causes the grid to actively transmit active power to the power electronic generation system or power electronic transmission system, and the transmitted active power increases. As a result, since the DC side of the power electronic generation system or power electronic transmission system is no-load, surplus power is generated, triggering the activation of energy-consuming devices.

[0083] In some embodiments, after performing step S401 or step S402, the DC voltage of the power electronic power generation system or the power electronic transmission system is detected. When the voltage threshold is exceeded, the energy-consuming device is activated.

[0084] Specifically, a decrease in the active power delivered by a power electronic generation system or a power electronic transmission system, or an increase in the active power absorbed from the grid by the power electronic generation system or a power electronic transmission system, will inevitably lead to a decrease in the DC voltage at the system input. Increase, at DC voltage When the voltage continues to rise and exceeds the DC voltage threshold, the energy-consuming device is triggered to turn on. The voltage threshold can be set according to the actual application scenario.

[0085] In some embodiments, after performing step S401 or step S402, when the average voltage of a submodule of the power electronic power generation system or the power electronic power transmission system is detected to exceed a voltage threshold, the energy consumption device is turned on.

[0086] Specifically, the power electronic generation system or power electronic transmission system includes a Management Module (MMC), where the MMC comprises multiple sub-modules. When the active power delivered by the power electronic generation system or power electronic transmission system decreases, or when the active power absorbed by the power electronic generation system or power electronic transmission system from the grid increases, the average voltage of the sub-modules in the MMC will inevitably rise. When the average voltage of the sub-modules continues to rise and exceeds a voltage threshold, the energy-consuming device is triggered to start. The voltage threshold can be set according to the actual application scenario.

[0087] In this embodiment of the application, after reducing the active power sent to the grid by the power electronic power generation system or the power electronic power transmission system, or after increasing the active power absorbed from the grid by the power electronic power generation system or the power electronic power transmission system, the energy consumption device can be turned on to conduct an energy consumption test by monitoring the DC voltage of the system or the average voltage of the system sub-modules. When the DC voltage or the average voltage of the sub-modules exceeds the voltage threshold, the energy consumption device can be turned on to conduct an energy consumption test without artificially creating a short circuit fault.

[0088] Step S403: Conduct an energy consumption test using an energy-consuming device and obtain the test results. See reference [link / reference needed] for details. Figure 3 The detailed description of step S303 in the illustrated embodiment will not be repeated here.

[0089] Step S404: Activate the DC voltage control loop and stop actively reducing the active current of the power electronic power generation system or power electronic transmission system.

[0090] Specifically, after the energy consumption test is completed, see again Figure 5 With the DC voltage control loop Test=0 (i.e., switch Ctrl=0), the DC voltage control loop is reopened, and the active current reference command value for the power electronic generation or transmission system is no longer actively reduced. The output of the DC voltage control loop or the submodule average voltage control loop is used as the active current reference command value. The PI regulator continues to be used based on the DC voltage... With reference DC voltage The voltage deviation between them is adjusted using a PI controller.

[0091] In this embodiment, after the energy consumption test is completed, the DC voltage control loop is restarted to restore the balance control between the active power input to the system and the grid-connected power of the system, so that the DC voltage of the system or the average voltage of the sub-module is reduced and restored to the rated value, thereby shutting down the energy consumption device.

[0092] The testing method for energy-consuming devices provided in this embodiment increases the DC voltage of the system or the average voltage of its submodules by reducing the active power sent to the grid by the power electronic power generation system or the power electronic transmission system, or by increasing the active power absorbed from the grid by the power electronic power generation system or the power electronic transmission system. This triggers the automatic activation of the energy-consuming device. An energy consumption test is then conducted based on the energy-consuming device to determine whether it can dissipate the surplus power generated by the system, thus obtaining the test results. This eliminates the need for artificial short-circuiting to create AC faults, allowing energy consumption tests to be conducted in real-world scenarios. This verifies the logic and functionality of the energy-consuming device in real-world scenarios, covering a wider range of scenarios and offering higher accuracy.

[0093] The energy consumption test scheme of the present invention will be described in detail below with reference to a specific application example.

[0094] like Figure 5 As shown, when testing the energy-consuming device, the Test value of the DC voltage control loop is actively set to 1. After Test=1, the PI control loop of the DC voltage is temporarily canceled, and the voltage is simultaneously reduced. This reduces the active current, thereby decreasing the active power delivered by the power electronic generation or transmission system. The reduced active power inevitably leads to a decrease in the system's DC voltage. Alternatively, an increase in the capacitor voltage of the MMC submodule may trigger the automatic activation of the energy-consuming device, which then enters the test state.

[0095] To exit the test state, simply set Test in the DC voltage control loop to 0. After Test=0, the active current reference command... The voltage will no longer be intentionally reduced, and the PI control loop of the DC voltage will be reactivated to balance the input power at the input terminal and the active power delivered at the output terminal. DC voltage Once the energy consumption is reduced, the energy-consuming device will automatically exit the test.

[0096] The relevant technologies can only verify the logic and functionality of energy-consuming devices through simulation, and cannot perform live tests in a way that is more effective than creating AC faults.

[0097] This application verifies energy-consuming devices without creating AC faults, starting from the inherent nature of energy-consuming device operation and utilizing the device to handle surplus power. During testing, the active current reference command is actively reduced. The value, without reducing the AC voltage, reduces the AC output power of the inverter-side MMC, thereby creating surplus power due to the imbalance between DC transmission power and AC output power, and further naturally tests the logic and function of the energy-consuming device in handling surplus power.

[0098] This application can be applied to most power electronic equipment and engineering that use energy-consuming devices, and the control strategy is easy to implement in engineering and has high reliability.

[0099] This application enables live testing of energy-consuming devices without the need for costly and dangerous AC faults. Taking a 3GW offshore wind power flexible DC transmission project's energy-consuming device as an example, the cost of a single device is around 100 million RMB. This application can more fully verify the reliability of high-cost energy-consuming devices without creating AC faults.

[0100] This embodiment also provides a test apparatus for an energy-consuming device, which is used to implement the above embodiments and preferred embodiments; details already described will not be repeated. As used below, the term "module" can refer to a combination of software and / or hardware that performs a predetermined function. Although the apparatus described in the following embodiments is preferably implemented in software, hardware implementation, or a combination of software and hardware, is also possible and contemplated.

[0101] This embodiment provides a test apparatus for an energy-consuming device, applied to a power electronic power generation system or power electronic transmission system including the energy-consuming device. The output terminal of the power electronic power generation system or power electronic transmission system is connected to the power grid, such as... Figure 8 As shown, the experimental apparatus includes:

[0102] The control module 801 is used to control the input power of the power electronic power generation system or power electronic transmission system to remain unchanged and reduce the active power sent to the grid by the power electronic power generation system or power electronic transmission system to control the energy consumption device to start if the power electronic power generation system or power electronic transmission system is operating in normal power generation mode; or, if the DC side of the power electronic power generation system or power electronic transmission system is unloaded and operates in reactive power compensation mode, increase the active power absorbed by the power electronic power generation system or power electronic transmission system from the grid to control the energy consumption device to start.

[0103] The processing module 802 is used to conduct energy consumption tests using energy-consuming devices and obtain the energy consumption test results.

[0104] In some alternative implementations, the power electronic power generation system or power electronic power transmission system includes a voltage control loop, which includes a DC voltage control loop or a submodule average voltage control loop.

[0105] The DC voltage control loop is used to adjust the active current output by the power electronic power generation system or power electronic transmission system according to the DC voltage of the power electronic power generation system or power electronic transmission system, so as to regulate the active power transmitted to the grid by the power electronic power generation system or power electronic transmission system.

[0106] The submodule average voltage control loop is used to adjust the active current output by the power electronic power generation system or power electronic transmission system according to the submodule average voltage of the power electronic power generation system or power electronic transmission system, so as to regulate the active power transmitted to the grid by the power electronic power generation system or power electronic transmission system; wherein, the reference direction of the active current is from the power electronic power generation system or power electronic transmission system to the grid.

[0107] In some alternative implementations, the control module 801 is further configured to:

[0108] Close the DC voltage control loop or the submodule average voltage control loop, and actively reduce the active current reference command value of the power electronic power generation system or power electronic transmission system in normal power generation mode.

[0109] In some alternative implementations, the control module 801 is further configured to:

[0110] Close the DC voltage control loop or the submodule average voltage control loop, and actively reduce the active current reference command value of the power electronic power generation system or power electronic transmission system when it is under no-load on the DC side and operating in reactive power compensation mode.

[0111] In some alternative implementations, the control module 801 is further configured to:

[0112] When the DC voltage or average voltage of a submodule in a power electronic power generation system or power electronic transmission system exceeds a voltage threshold, the energy-consuming device is activated.

[0113] In some alternative implementations, after obtaining the energy consumption test results, the device is also used for:

[0114] The DC voltage control loop or the submodule average voltage control loop is activated, and the active current reference command value of the power electronic power generation system or the power electronic transmission system is stopped from being actively reduced. The output of the DC voltage control loop or the submodule average voltage control loop is used as the active current reference command value.

[0115] Further functional descriptions of the above modules and units are the same as those in the corresponding embodiments described above, and will not be repeated here.

[0116] In this embodiment, the test device for the energy-consuming device is presented in the form of a functional unit. Here, a unit refers to an ASIC (Application Specific Integrated Circuit) circuit, a processor and memory that execute one or more software or fixed programs, and / or other devices that can provide the above functions.

[0117] This invention also provides a power electronic power generation system having the above-described features. Figure 8 The test setup for the energy-consuming device shown.

[0118] Please see Figure 9 , Figure 9 This is a schematic diagram of the structure of a power electronic power generation system provided in an optional embodiment of the present invention, such as... Figure 9 As shown, the power electronic power generation system includes: one or more first processors 10, a first memory 20, and interfaces for connecting the various components, including high-speed interfaces and low-speed interfaces. The various components communicate with each other via different buses and can be mounted on a common motherboard or otherwise installed as needed. The first processor can process instructions executed within the power electronic power generation system, including instructions stored in or on the first memory to display graphical information of a GUI on an external input / output device (such as a display device coupled to the interface). In some alternative embodiments, multiple first processors and / or multiple buses can be used with multiple memories and multiple memory modules, if desired. Similarly, multiple devices can be connected, each providing some of the necessary operations (e.g., as a server array, a set of blade servers, or a multiprocessor system). Figure 9 Take a first processor 10 as an example.

[0119] The first processor 10 may be a central processing unit, a network processor, or a combination thereof. The first processor 10 may further include a hardware chip. The hardware chip may be an application-specific integrated circuit (ASIC), a programmable logic device (PLD), or a combination thereof. The programmable logic device may be a complex programmable logic device (CAMP), a field-programmable gate array (FPGA), a general-purpose array logic (GPRS), or any combination thereof.

[0120] The first memory 20 stores instructions executable by at least one first processor 10 to cause the at least one first processor 10 to perform the method shown in the above embodiments.

[0121] The first memory 20 may include a program storage area and a data storage area. The program storage area may store the operating system and applications required for at least one function; the data storage area may store data created based on the use of the power electronic power generation system. Furthermore, the first memory 20 may include high-speed random access memory and may also include non-transient memory, such as at least one disk storage device, flash memory device, or other non-transient solid-state storage device. In some alternative embodiments, the first memory 20 may optionally include memory remotely located relative to the first processor 10, and these remote memories can be connected to the power electronic power generation system via a network. Examples of such networks include, but are not limited to, the Internet, corporate intranets, local area networks, mobile communication networks, and combinations thereof.

[0122] The first memory 20 may include volatile memory, such as random access memory; the memory may also include non-volatile memory, such as flash memory, hard disk or solid-state drive; the first memory 20 may also include a combination of the above types of memory.

[0123] The power electronic power generation system also includes a first communication interface 30 for communicating with other devices or communication networks.

[0124] This invention also provides a power electronic transmission system having the above-described features. Figure 8 The test setup for the energy-consuming device shown.

[0125] Please see Figure 10 , Figure 10 This is a schematic diagram of the structure of a power electronic transmission system provided in an optional embodiment of the present invention, as shown below. Figure 10As shown, the power electronic transmission system includes one or more second processors 40, a second memory 50, and interfaces for connecting the components, including high-speed interfaces and low-speed interfaces. The components communicate with each other via different buses and can be mounted on a common motherboard or otherwise as required. The second processors can process instructions executed within the power electronic transmission system, including instructions stored in or on the second memory to display graphical information of a GUI on external input / output devices (such as display devices coupled to the interface). In some alternative embodiments, multiple second processors and / or multiple buses can be used with multiple memories and multiple memory sets, if desired. Similarly, multiple devices can be connected, each providing some of the necessary operations (e.g., as a server array, a set of blade servers, or a multiprocessor system). Figure 10 Take a second processor 40 as an example.

[0126] The second processor 40 may be a central processing unit, a network processor, or a combination thereof. The second processor 40 may further include a hardware chip. The hardware chip may be an application-specific integrated circuit (ASIC), a programmable logic device (PLD), or a combination thereof. The programmable logic device may be a complex programmable logic device (CAMP), a field-programmable gate array (FPGA), a general-purpose array logic (GPA), or any combination thereof.

[0127] The second memory 50 stores instructions executable by at least one second processor 40 to cause the at least one second processor 40 to perform the method shown in the above embodiments.

[0128] The second memory 50 may include a program storage area and a data storage area. The program storage area may store the operating system and applications required for at least one function; the data storage area may store data created based on the use of the power electronic transmission system. Furthermore, the second memory 50 may include high-speed random access memory and may also include non-transient memory, such as at least one disk storage device, flash memory device, or other non-transient solid-state storage device. In some alternative embodiments, the second memory 50 may optionally include memory remotely located relative to the second processor 40, and these remote memories can be connected to the power electronic transmission system via a network. Examples of such networks include, but are not limited to, the Internet, corporate intranets, local area networks, mobile communication networks, and combinations thereof.

[0129] The second memory 50 may include volatile memory, such as random access memory; the memory may also include non-volatile memory, such as flash memory, hard disk or solid-state drive; the second memory 50 may also include a combination of the above types of memory.

[0130] The power electronic power generation system also includes a second communication interface 60 for the power electronic power transmission system to communicate with other devices or communication networks.

[0131] This invention also provides a computer-readable storage medium. The methods described above according to embodiments of the invention can be implemented in hardware or firmware, or implemented as computer code that can be recorded on a storage medium, or implemented as computer code downloaded via a network and originally stored on a remote storage medium or a non-transitory machine-readable storage medium and then stored on a local storage medium. Thus, the methods described herein can be processed by software stored on a storage medium using a general-purpose computer, a dedicated processor, or programmable or dedicated hardware. The storage medium can be a magnetic disk, optical disk, read-only memory, random access memory, flash memory, hard disk, or solid-state drive, etc.; further, the storage medium can also include combinations of the above types of memory. It is understood that computers, processors, microprocessor controllers, or programmable hardware include storage components capable of storing or receiving software or computer code, which, when accessed and executed by the computer, processor, or hardware, implements the methods shown in the above embodiments.

[0132] A portion of this invention can be applied as a computer program product, such as computer program instructions, which, when executed by a computer, can invoke or provide the methods and / or technical solutions according to the invention through the operation of the computer. Those skilled in the art will understand that the forms in which computer program instructions exist in a computer-readable medium include, but are not limited to, source files, executable files, installation package files, etc. Correspondingly, the ways in which computer program instructions are executed by a computer include, but are not limited to: the computer directly executing the instructions, or the computer compiling the instructions and then executing the corresponding compiled program, or the computer reading and executing the instructions, or the computer reading and installing the instructions and then executing the corresponding installed program. Here, the computer-readable medium can be any available computer-readable storage medium or communication medium accessible to a computer.

[0133] Although embodiments of the invention have been described in conjunction with the accompanying drawings, those skilled in the art can make various modifications and variations without departing from the spirit and scope of the invention, and such modifications and variations all fall within the scope defined by the appended claims.

Claims

1. A test method for an energy-consuming device, characterized in that, The method, applied to a power electronic power generation system or power electronic transmission system including energy-consuming devices, wherein the output of the power electronic power generation system or power electronic transmission system is connected to the power grid, comprises: If the power electronic power generation system or power electronic transmission system is operating in normal power generation mode, the input power of the power electronic power generation system or power electronic transmission system is kept constant, and the active power sent from the power electronic power generation system or power electronic transmission system to the power grid is reduced, so as to control the energy-consuming device to start. Alternatively, if the DC side of the power electronic power generation system or power electronic transmission system is unloaded and operates in reactive power compensation mode, the active power absorbed by the power electronic power generation system or power electronic transmission system from the power grid is increased to control the energy-consuming device to start. An energy consumption test was conducted using the energy-consuming device, and the test results were obtained. The power electronic power generation system or power electronic power transmission system includes a voltage control loop, which includes a DC voltage control loop or a submodule average voltage control loop. The DC voltage control loop is used to adjust the active current output by the power electronic power generation system or power electronic transmission system according to the DC voltage of the power electronic power generation system or power electronic transmission system, so as to adjust the active power transmitted by the power electronic power generation system or power electronic transmission system to the grid. The submodule average voltage control loop is used to adjust the active current output by the power electronic power generation system or power electronic transmission system according to the submodule average voltage of the power electronic power generation system or power electronic transmission system, so as to adjust the active power transmitted by the power electronic power generation system or power electronic transmission system to the power grid; wherein, the reference direction of the active current is from the power electronic power generation system or power electronic transmission system to the power grid.

2. The test method for the energy-consuming device according to claim 1, characterized in that, The reduction of active power transmitted from the power electronic generation system or power electronic transmission system to the power grid includes: The DC voltage control loop or the submodule average voltage control loop is shut down, and the active current reference command value of the power electronic power generation system or power electronic transmission system in normal power generation mode is actively reduced.

3. The test method for the energy-consuming device according to claim 1, characterized in that, Increasing the active power absorbed by the power electronic generation system or power electronic transmission system from the power grid includes: The DC voltage control loop or the submodule average voltage control loop is closed, and the active current reference command value of the power electronic power generation system or power electronic transmission system is actively reduced when the DC side is unloaded and operating in reactive power compensation mode.

4. The test method for the energy-consuming device according to claim 2 or 3, characterized in that, The control of the energy-consuming device to turn on includes: When the DC voltage or average voltage of the submodule of the power electronic power generation system or power electronic power transmission system is detected to exceed the voltage threshold, the energy-consuming device is turned on.

5. The test method for the energy-consuming device according to claim 2 or 3, characterized in that, After obtaining the energy consumption test results, the method further includes: The DC voltage control loop or the submodule average voltage control loop is activated, and the active current reference command value of the power electronic power generation system or the power electronic power transmission system is stopped from being actively reduced. The output of the DC voltage control loop or the submodule average voltage control loop is used as the active current reference command value.

6. A test apparatus for an energy-consuming device, characterized in that, The test apparatus is applied to a power electronic power generation system or power electronic transmission system that includes energy-consuming devices, wherein the output terminal of the power electronic power generation system or power electronic transmission system is connected to the power grid, and the test apparatus includes: The control module is configured to, if the power electronic power generation system or power electronic transmission system is operating in normal power generation mode, maintain the input power of the power electronic power generation system or power electronic transmission system unchanged and reduce the active power sent from the power electronic power generation system or power electronic transmission system to the power grid, so as to control the energy-consuming device to start; or, if the DC side of the power electronic power generation system or power electronic transmission system is unloaded and operates in reactive power compensation mode, increase the active power absorbed by the power electronic power generation system or power electronic transmission system from the power grid, so as to control the energy-consuming device to start. The processing module is used to conduct an energy consumption test using the energy-consuming device and obtain the energy consumption test results; The power electronic power generation system or power electronic power transmission system includes a voltage control loop, which includes a DC voltage control loop or a submodule average voltage control loop. The DC voltage control loop is used to adjust the active current output by the power electronic power generation system or power electronic transmission system according to the DC voltage of the power electronic power generation system or power electronic transmission system, so as to adjust the active power transmitted by the power electronic power generation system or power electronic transmission system to the grid. The submodule average voltage control loop is used to adjust the active current output by the power electronic power generation system or power electronic transmission system according to the submodule average voltage of the power electronic power generation system or power electronic transmission system, so as to adjust the active power transmitted by the power electronic power generation system or power electronic transmission system to the power grid; wherein, the reference direction of the active current is from the power electronic power generation system or power electronic transmission system to the power grid.

7. A power electronic power generation system, characterized in that, The power generation system includes: A first memory and a first processor are interconnected and communicate with each other. The first memory stores computer instructions, and the first processor executes the computer instructions to perform the test method of the energy-consuming device according to any one of claims 1 to 5.

8. A power electronic transmission system, characterized in that, The power transmission system includes: A second memory and a second processor are interconnected and communicate with each other. The second memory stores computer instructions, and the second processor executes the computer instructions to perform the test method of the energy-consuming device according to any one of claims 1 to 5.

9. A computer-readable storage medium, characterized in that, The computer-readable storage medium stores computer instructions for causing the computer to perform the test method of the energy-consuming device according to any one of claims 1 to 5.

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