Universal dry-type load and load control system for medium and high voltage and multiple operating modes

Abstract

The application discloses a medium and high voltage and multi-working mode general dry load and load control system, relates to the technical field of power electronic devices, and the dry load comprises at least one load box, each load box comprises three solid-state circuit breakers and at least one load module; each load module comprises three load branches, each load branch comprises a fuse, a solid-state contactor and a resistor; through a control instruction, a target circuit breaker and a target solid-state contactor are closed, so that the load box is configured to be in one of a direct-current load carrying working mode, an alternating-current load carrying working mode, a high-power pulse load working mode, a nonlinear load working mode and a constant-power load working mode. The application is used to solve the problems of limited voltage, single function and slow response speed of the dry load in the prior art, ensure that the dry load is applicable to a medium and high voltage range, and improve the functional diversity and response speed of the dry load.

Description

Technical Field

[0001] This application relates to the field of power electronic equipment technology, and in particular to a general-purpose dry load and load control system for medium and high voltage and multiple operating modes. Background Technology

[0002] Existing medium-voltage dry loads are limited by the voltage level of the switching devices, the load structure, and the device performance, which limits their operation to a limited range of voltage levels and operating modes, and can only simulate single resistive and inductive loads.

[0003] Regarding voltage level range: Medium-voltage dry-type loads primarily utilize medium- and high-voltage contactors as the switching control method for load circuits. The maximum voltage level for contactor products used in medium-voltage DC applications does not exceed DC 3600V; the maximum voltage level for contactor products used in medium-voltage AC applications does not exceed AC 10.5kV, and medium-voltage DC and AC contactor products are not interchangeable. Therefore, the limitation on the contactor's voltage level range directly restricts the rated voltage of the products to around DC 3600V and AC 10.5kV. When higher voltage level dry-type loads (high-voltage dry-type loads) are used, the only solution is to add additional components, such as DC / DC modules and transformers.

[0004] Regarding the operating mode: Existing medium-voltage dry-type loads use traditional electrical breaking devices such as vacuum circuit breakers and receivers to control the load circuit. Due to limitations in the response speed and inherent mechanical characteristics of these devices, existing medium-voltage dry-type loads suffer from drawbacks such as limited functionality and slow response speed. Summary of the Invention

[0005] In response to the aforementioned problems and technical requirements, the applicant proposes a general-purpose dry-type load and load control system for medium and high voltage and multiple operating modes. This system aims to solve the problems of limited operating voltage, single function, and slow response speed of existing dry-type loads, ensuring that the dry-type load is applicable to medium and high voltage ranges and improving the functional diversity and response speed of the dry-type load.

[0006] This application provides a medium- and high-voltage universal dry load with multiple operating modes, including: at least one load box, each load box including: three solid-state circuit breakers and at least one load module, the solid-state circuit breakers and the load module being connected via a busbar;

[0007] Each load module includes three load branches, each load branch including a fuse, a solid-state contactor, and a resistor, wherein the resistors corresponding to the three load branches are the same;

[0008] By controlling the target circuit breaker and the target solid-state contactor, the load box is configured to operate in one of the following modes: DC load mode, AC load mode, high-power pulse load mode, nonlinear load mode, and constant power load mode.

[0009] The control commands include any one or more of the following: current operating mode, test requirements, voltage level range, first number of closed solid-state circuit breakers, second number of closed solid-state contactors, first number of required load modules, first connection method of each load module when there are multiple load modules, second number of required load boxes, and second connection method of each load box when there are multiple load boxes.

[0010] The target circuit breaker is obtained from three solid-state circuit breakers based on the control command; the target solid-state contactor is obtained from a solid-state contactor of at least one load module based on the control command.

[0011] For each working mode, after configuration, the load of the load cell is consistent with the load of the corresponding device under test.

[0012] According to the medium-high voltage and multi-operating-mode general dry load provided in the embodiments of this application, the target circuit breaker includes: any two solid-state circuit breakers out of three solid-state circuit breakers, and the target solid-state contactor includes: a solid-state contactor in the load branch corresponding to the target circuit breaker determined from at least one load module.

[0013] The target circuit breakers include: a first circuit breaker and a second circuit breaker;

[0014] For a load module, the target solid-state contactor includes: a first solid-state contactor and a second solid-state contactor;

[0015] The control command closes the target circuit breaker and the target solid-state contactor, connecting the positive terminal of the power supply to the load branch corresponding to the first circuit breaker and the negative terminal of the power supply to the load branch corresponding to the second circuit breaker.

[0016] The control command is used to indicate that the current working mode is the DC load mode, the first number of shutdowns is two, and the second number of shutdowns, the first quantity, the first connection method, the second quantity, and the second connection method are determined based on the voltage level range of the device under test.

[0017] According to the medium-high voltage and multi-operating-mode general dry load provided in the embodiments of this application, the target circuit breaker includes: three solid circuit breakers, and the target solid contactor includes: solid contactors for three load branches determined from at least one load module.

[0018] The target circuit breaker is closed first via the control command, and all target solid-state contactors are closed simultaneously.

[0019] The control command is used to indicate that the current working mode is the AC load mode, the first number of shutdowns is three, and the second number of shutdowns, the first quantity, the first connection method, the second quantity, and the second connection method are determined based on the voltage level range of the device under test.

[0020] According to the medium-high voltage and multi-operating-mode general dry load provided in the embodiments of this application, the target circuit breaker includes: three solid circuit breakers, and the target solid contactor includes: solid contactors for three load branches determined from at least one load module.

[0021] The control command prioritizes closing the target circuit breaker, simultaneously closing all the target solid-state contactors, and after a preset time, simultaneously opening all the target solid-state contactors.

[0022] The control command is used to indicate that the current working mode is the high-power pulse load working mode, the first number of shutdowns is three, and the second number of shutdowns, the first quantity, the first connection method, the second quantity, and the second connection method are determined based on the voltage level range of the device under test.

[0023] According to the medium-high voltage and multi-operating-mode general dry load provided in the embodiments of this application, the target circuit breaker includes: three solid circuit breakers, and the target solid contactor includes: solid contactors for two load branches determined from at least one load module.

[0024] The control command is used to close the target circuit breaker first, and then close all the target solid-state contactors.

[0025] The control command is used to indicate that the current working mode is the nonlinear load working mode. The test requirements are: the first number of shutdowns is three, and the second number of shutdowns, the first quantity, the first connection method, the second quantity, and the second connection method are determined based on the voltage level range of the device under test.

[0026] The testing requirements include simulating a full-bridge rectifier circuit by controlling the on / off state of the target solid-state contactor.

[0027] According to the medium-high voltage and multi-operating-mode general dry load provided in the embodiments of this application, the target circuit breaker includes: three solid circuit breakers, and the target solid contactor includes: solid contactors for three load branches determined from at least one load module.

[0028] The target circuit breaker is closed first by means of the control command, and different numbers of the target solid-state contactors are closed sequentially within a preset time period.

[0029] The control command is used to indicate that the current working mode is the constant power load working mode. The test requirements are: the first number of shutdowns is three, and the second number of shutdowns, the first quantity, the first connection method, the second quantity, and the second connection method are determined based on the voltage level range of the device under test.

[0030] The testing requirements include adjusting the output voltage of the load module to enable the load bank to operate at constant power under different input voltages.

[0031] According to the embodiments of this application, the general-purpose dry load for medium and high voltage and multiple working modes further includes: a controller;

[0032] The solid-state circuit breaker and the solid-state contactor are connected to the controller;

[0033] The controller is used to close the target circuit breaker and the target solid-state contactor by means of the control command.

[0034] This application embodiment also provides a load control system for a general-purpose dry load with medium and high voltage and multiple working modes based on the above embodiments, including: a control device, a dry load, and a load protection device;

[0035] The control device and the dry load are respectively connected to the load protection device;

[0036] The control device is used to generate control commands based on the current operating conditions and send the control commands to the dry load;

[0037] The dry load is used to close the target circuit breaker and the target solid-state contactor by control commands to configure the load box to operate in one of the following modes: DC load mode, AC load mode, high-power pulse load mode, nonlinear load mode, and constant power load mode.

[0038] The control commands include any one or more of the following: current operating mode, test requirements, voltage level range, first number of solid-state circuit breakers to be closed, second number of solid-state contactors to be closed, first number of required load modules, first connection method of each load module if there are multiple load modules, second number of required load boxes, and second connection method of each load box if there are multiple load boxes; the target circuit breaker is obtained from three solid-state circuit breakers based on the control commands; the target solid-state contactor is obtained from the solid-state contactor of at least one load module based on the control commands; for each operating mode, after configuration, the load of the load box is consistent with the load of the corresponding device under test;

[0039] The control device is also used to monitor the operation of the dry load and send the operation status to the load protection device;

[0040] The load protection device is used to protect the dry load based on the operating conditions.

[0041] According to the load control system provided in the embodiments of this application, the control device is connected to the controller of the dry load;

[0042] The controller is used to close the target circuit breaker and the target solid-state contactor by means of control commands.

[0043] According to the load control system provided in the embodiments of this application, the control device includes a display screen, which is used to display the operating status.

[0044] The medium- and high-voltage and multi-mode general-purpose dry-type load and load control system provided in this application embodiment includes: at least one load box, each load box including: three solid-state circuit breakers and at least one load module; each load module including: three load branches, each load branch including: a fuse, a solid-state contactor and a resistor, wherein the resistors corresponding to the three load branches are the same. Through control commands, the target circuit breaker and the target solid-state contactor are closed to configure the load box to operate in one of the following modes: DC load mode, AC load mode, high-power pulse load mode, nonlinear load mode, and constant power load mode; wherein the control commands include: the current operating mode, the test requirements of the device under test, the voltage level range, the first number of solid-state circuit breakers to be closed, the second number of solid-state contactors to be closed, the first number of required load modules, the first connection method of each load module when there are multiple load modules, the second number of required load boxes, and the second connection method of each load box when there are multiple load boxes; wherein, the target... The circuit breaker is obtained from three solid-state circuit breakers based on control commands; the target solid-state contactor is obtained from the solid-state contactor of at least one load module based on control commands. For each operating mode, after configuration, the load of the load box is consistent with the load of the corresponding device under test. It can be seen that this application achieves the design of medium and high voltage loads exceeding the withstand voltage of existing switching devices by using solid-state circuit breakers instead of traditional vacuum circuit breakers. Furthermore, by controlling the on / off of solid-state circuit breakers and solid-state contactors through control commands, the load box can adapt to the medium and high voltage range and meet various operating modes of test conditions. This achieves the purpose of making dry-type loads suitable for the medium and high voltage range and improving the functional diversity and response speed of dry-type loads. Attached Figure Description

[0045] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the 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 based on these drawings without creative effort.

[0046] Figure 1 This is a schematic diagram of the structure of a general-purpose dry load with medium and high voltage and multiple working modes provided in the embodiments of this application;

[0047] Figure 2 This is a schematic diagram of the load control system provided in an embodiment of this application;

[0048] Figure 3 This is a schematic diagram of the solid-state contactor provided in the embodiments of this application. Detailed Implementation

[0049] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this invention.

[0050] This application provides a general-purpose dry load for medium and high voltage and multiple operating modes, such as... Figure 1 As shown, the dry load includes at least one load box 1, each load box 1 including three solid-state circuit breakers 11 and at least one load module 12, the solid-state circuit breakers 11 and the load module 12 being connected via a busbar.

[0051] Each load module 12 includes three load branches 121, each load branch 121 including a fuse 1211, a solid contactor 1212 and a resistor 1213, wherein the resistors corresponding to the three load branches 121 are the same.

[0052] By controlling the target circuit breaker and the target solid-state contactor, the load cell 1 is configured to operate in one of the following modes: DC load mode, AC load mode, high-power pulse load mode, nonlinear load mode, and constant power load mode.

[0053] The control commands include: the current operating mode, the test requirements of the device under test, the voltage level range, the first number of solid circuit breakers 11 to be closed, the second number of solid contactors 1212 to be closed, the first number of load modules 12 required, the first connection method of each load module 12 when there are multiple load modules 12, the second number of load boxes 1 required, and the second connection method of each load box 1 when there are multiple load boxes 1.

[0054] The target circuit breaker is obtained from three solid-state circuit breakers 11 based on control commands; the target solid-state contactor is obtained from solid-state contactor 1212 of at least one load module 12 based on control commands.

[0055] For each working mode, after configuration, the load of load cell 1 is consistent with the load of the corresponding device under test.

[0056] Among them, a dry load is obtained by integrating multiple load boxes 1.

[0057] Specifically, the target circuit breaker is obtained based on one or more of the current operating mode, test requirements, and first number of closing operations in the control command; the target solid-state contactor is obtained based on one or more of the second number of closing operations, voltage level range, first quantity, first connection method, second quantity, and second connection method in the control command.

[0058] Among them, Figure 1 The illustration shows one load cell 1 and three load modules 12 connected in parallel. This is only an example and is not intended to limit the scope of protection of this application.

[0059] This application uses three solid-state circuit breakers 11, corresponding to three busbars (busbar a, busbar b, and busbar c). The purpose of using three solid-state circuit breakers 11 is to enable operation with both three-phase AC and DC power, achieving AC / DC compatibility. This application uses multiple load boxes 1 and multiple load modules 12, and by adjusting the first connection method of each load module 12 and the second connection method of each load box 1, it achieves simulation testing of the device under test in various operating modes.

[0060] This application achieves a medium-to-high voltage load design that exceeds the withstand voltage of existing switching devices by using solid-state circuit breakers instead of traditional vacuum circuit breakers. Furthermore, by controlling the on / off state of the solid-state circuit breaker and solid-state contactor, the load box can be adapted to the medium-to-high voltage range and meet various operating modes under test conditions. This realizes the purpose of making dry-type loads suitable for the medium-to-high voltage range and improving the functional versatility and response speed of dry-type loads.

[0061] This application uses solid-state contactors, which are not limited by the voltage level of traditional contactors. Furthermore, solid-state contactors have advantages over traditional contactors, such as fast turn-off speed and controllable turn-on and turn-off. Based on this, fast and multi-functional control of the load circuit is achieved.

[0062] In one specific embodiment, the dry load further includes a controller, with the solid-state circuit breaker 11 and the solid-state contactor 1212 connected to the controller. The controller is used to close the target circuit breaker and the target solid-state contactor via control commands.

[0063] Among them, the solid-state circuit breaker 11 and solid-state contactor 1212 of the dry load are normally open when not in operation or in the initial state.

[0064] For example, dry loads can be used to simulate high-power DC purely resistive loads, as well as electrolytic loads, etc.

[0065] Specifically, this application, taking into account both the compactness and safety of dry-type loads, adopts a standard container-style structure for the dry-type load enclosure, which is divided into control room, switch room, and resistor compartment. For heat-generating components (such as resistors), high-temperature resistant insulating boards are used to isolate the resistance wire groups and provide support, with a maintenance corridor extending from the center of the insulating boards. External cables connect to the switch room, and inside the dry-type load, copper busbars connect the solid-state circuit breaker 11, solid-state contactor 1212, and resistors, among other equipment. The copper busbars are fixed to the cabinet using high-voltage insulators and remain insulated from the cabinet.

[0066] Among them, the dry load in the application can be applied to medium and high voltage levels. Specifically, it can be achieved by modifying the number of resistors in series and parallel. That is, by controlling the first number of required load modules 12, the first connection method of each load module 12 when there are multiple load modules 12, the second number of required load boxes 1, and the second connection method of each load box 1 when there are multiple load boxes 1.

[0067] Specifically, in the case of a dry load that does not include a controller, an external control device can be connected to the controller along with the solid-state circuit breaker 11 and the solid-state contactor 1212 so that the external control device can close the target circuit breaker and the target solid-state contactor by means of control commands.

[0068] In one specific embodiment, the target circuit breaker includes any two of three solid-state circuit breakers, and the target solid-state contactor includes a solid-state contactor in the load branch corresponding to the target circuit breaker, determined from at least one load module. The target circuit breaker includes a first circuit breaker and a second circuit breaker; for a load module, the target solid-state contactor includes a first solid-state contactor and a second solid-state contactor.

[0069] By controlling the target circuit breaker and the target solid-state contactor, the positive terminal of the power supply is connected to the load branch corresponding to the first circuit breaker, and the negative terminal of the power supply is connected to the load branch corresponding to the second circuit breaker.

[0070] Among them, the control command is used to indicate that the current working mode is DC load working mode, the first number of shutdowns is two, and the second number of shutdowns, the first quantity, the first connection method, the second quantity and the second connection method are determined based on the voltage level range of the device under test.

[0071] Among them, the DC load operation mode involves testing the power supply performance by adjusting the resistance in the dry load.

[0072] For example, the first circuit breaker is a solid-state circuit breaker corresponding to bus a, and the second circuit breaker is a solid-state circuit breaker corresponding to bus c. The corresponding applied load branches include the first load branch (the load branch corresponding to bus a) and the second load branch (the load branch corresponding to bus c). The corresponding first solid-state contactors are the solid-state contactor corresponding to bus a and the solid-state contactor corresponding to bus c.

[0073] Specifically, when the control command indicates that the current operating mode is DC load operating mode, the first circuit breaker is closed to connect the positive terminal of the power supply to the first load branch; the second circuit breaker is closed to connect the negative terminal of the power supply to the second load branch; and the first solid-state contactor and the second solid-state contactor are closed to allow the load module to simulate the operating conditions of DC load operating mode.

[0074] Specifically, in DC load operation mode, the positive terminal of the power supply is connected to the connection point of bus a, and the negative terminal of the power supply is connected to the connection point of bus c. When the load module is working, the load branch corresponding to bus a and the load branch corresponding to bus c are connected, and the corresponding resistors are connected in series in the circuit.

[0075] In one specific embodiment, the target circuit breaker includes three solid-state circuit breakers, and the target solid-state contactor includes solid-state contactors for three load branches determined from at least one load module.

[0076] By controlling the circuit breaker, the target circuit breaker is closed first, and all target solid-state contactors are closed simultaneously.

[0077] Among them, the control command is used to indicate that the current working mode is AC load mode, the first number of shutdowns is three, and the second number of shutdowns, the first quantity, the first connection method, the second quantity and the second connection method are determined based on the voltage level range of the device under test.

[0078] The AC load-bearing mode involves adjusting parameters such as voltage, current, and power of the dry load to test the performance and stability of the device under test. This process is continuous.

[0079] For example, it can be used to simulate three-phase AC loads (e.g., high-power heaters), or, for example, to simulate electric motors by combining it with reactance, etc.

[0080] Specifically, in AC load-bearing mode, the three-phase power supply is connected to bus a, bus b, and bus c, respectively. When using a load, the three solid-state circuit breakers are first closed and kept closed. Then, the connection and disconnection of the corresponding resistor are achieved by controlling the opening and closing of the solid-state contactors (three solid-state contactors for each load module). When a resistor needs to be connected, the solid-state contactor is in the conducting state (closed state); when a resistor needs to be disconnected, the corresponding solid-state contactor is opened.

[0081] In AC load-bearing mode, by utilizing the synchronous switching capability of solid-state contactors, multiple solid-state contactors are connected in series and parallel to achieve the function of solid-state contactors at medium and high voltage levels. Solid-state circuit breakers mainly provide protection against abnormal load conditions such as overvoltage, overcurrent, smoke, and overtemperature.

[0082] In one specific embodiment, the target circuit breaker includes three solid-state circuit breakers, and the target solid-state contactor includes solid-state contactors for three load branches determined from at least one load module.

[0083] By controlling the circuit breaker, the target circuit breaker is closed first, and all target solid-state contactors are closed at the same time. After a preset time, all target solid-state contactors are opened at the same time.

[0084] Among them, the control command is used to indicate that the current working mode is the high-power pulse load working mode, the first number of shutdowns is three, and the second number of shutdowns, the first quantity, the first connection method, the second quantity and the second connection method are determined based on the voltage level range of the device under test.

[0085] Among them, the high-power pulse load working mode is designed to enable the load module to simulate the device under test based on high-power pulse technology.

[0086] For example, it can be used to simulate high-power linear motors, or to simulate high-power instantaneous charging conditions, etc.

[0087] Specifically, in the high-power pulse load operating mode, the target circuit breaker is first closed, and all target solid-state contactors are closed simultaneously. After the solid-state contactors close, the total power of the load modules that can form a circuit is consistent with the power of the device under test. Then, after a preset time, all target solid-state contactors are simultaneously disconnected based on the shutdown signal carried by the control command, so as to realize the simulation of high-power load.

[0088] The control commands also include a shutdown signal.

[0089] Specifically, the number of on / off cycles of the solid-state contactor is determined based on the function of the device under test, and the on / off cycle count is iteratively processed. Therefore, the control command also includes the on / off cycle count.

[0090] That is, the control command is used to indicate that the current working mode is the high-power pulse load working mode, the first number of shutdowns is three, and the second number of shutdowns, the first quantity, the first connection method, the second quantity, the second connection method, the shutdown signal, and the number of on / off cycles are determined based on the voltage level range of the device under test.

[0091] The on / off signal is sent based on a simulated actual process and controls the solid-state contactor.

[0092] In one specific embodiment, the target circuit breaker includes three solid-state circuit breakers, and the target solid-state contactor includes solid-state contactors for two load branches determined from at least one load module.

[0093] By controlling the command, the target circuit breaker is closed first, and all target solid-state contactors are closed.

[0094] Among them, the control command is used to indicate that the current working mode is a non-linear load working mode. The test requirements are: the first number of shutdowns is three, and the second number of shutdowns, the first quantity, the first connection method, the second quantity, and the second connection method are determined based on the voltage level range of the device under test.

[0095] The testing requirements include simulating a full-bridge rectifier circuit by controlling the on / off state of the target solid-state contactor.

[0096] Among them, the nonlinear load operating mode is achieved by simulating the full-bridge rectifier circuit by controlling the on and off of the solid-state contactor.

[0097] For example, high-power switching power supply equipment used to simulate actual operation (such as high-power frequency converters, high-power rectifiers, etc.).

[0098] Specifically, in the nonlinear load operating mode, the target circuit breaker is closed first, and the three-phase voltage waveform at the input terminal of the dry load is collected by a voltage sensor. The target solid-state contactor is closed to simulate the full-bridge rectifier circuit by analyzing the analysis results of the three-phase voltage waveform to simulate the nonlinear load.

[0099] For example, in U ab >U bc >U ca In this case, the solid-state contactors corresponding to bus a and bus b are closed, and the resistor circuit corresponding to the highest line voltage waveform is connected to realize the simulation of a full-bridge rectifier circuit.

[0100] in U bc >Uca >U ab In this case, the solid-state contactors corresponding to bus b and bus c are closed, and the resistor circuit corresponding to the highest line voltage waveform is connected to realize the simulation of a full-bridge rectifier circuit.

[0101] in U ca >U ab >U bc In this case, the solid-state contactors corresponding to bus c and bus a are closed, and the resistor circuit corresponding to the highest line voltage waveform is connected to realize the simulation of a full-bridge rectifier circuit.

[0102] In one specific embodiment, the target circuit breaker includes three solid-state circuit breakers, and the target solid-state contactor includes solid-state contactors for three load branches determined from at least one load module.

[0103] By controlling the circuit breaker, the target circuit breaker is closed first, and different numbers of target solid-state contactors are closed sequentially within a preset time period.

[0104] Among them, the control command is used to indicate that the current working mode is constant power load working mode. The test requirements are: the first number of shutdowns is three, and the second number of shutdowns, the first quantity, the first connection method, the second quantity, and the second connection method are determined based on the voltage level range of the device under test.

[0105] The testing requirements include adjusting the output voltage of the load module to enable the load bank to operate at constant power under different input voltages.

[0106] The constant power load operating mode is to put the solid-state contactor in pulse width modulation (PWM) mode.

[0107] For example, it can be used to simulate constant power loads in actual work (e.g., large machine tool spindles, high-power propulsion motors, etc.).

[0108] Specifically, in constant power load operation mode, different PWM waves are output by controlling the on / off state of the solid-state contactor to adjust the average value of the output voltage of each resistor. This is combined with a load branch with a constant resistance value to achieve dynamic output regulation of the DC voltage across the load.

[0109] Therefore, when the input voltage of a dry load changes, constant power operation of the dry load under different input voltages can be achieved by adjusting the average value of the output voltage of the load branch (or by connecting or disconnecting other load commands and adjusting the average value of the output voltage of their branches).

[0110] The dry-type load of this application utilizes solid-state circuit breakers and power electronic solid-state contactors to achieve medium and high voltage withstand load design. Taking advantage of the flexible voltage levels, fast switching speed, good synchronization performance, and controllable switching time of power electronic solid-state contactors, the load design can realize multiple operating modes, effectively improving the load utilization rate and reducing procurement costs.

[0111] This application also provides a load control system, such as... Figure 2 As shown, the system includes: a control device 201, a dry load 202 as described in any of the above embodiments, and a load protection device 203, wherein the control device 201 and the dry load 202 are respectively connected to the load protection device 203.

[0112] The control device 201 is used to generate control commands based on the current operating conditions and send the control commands to the dry load 202.

[0113] Dry-type load 202 is used to close the target circuit breaker and the target solid-state contactor by control commands to configure the load box to operate in one of the following modes: DC load mode, AC load mode, high-power pulse load mode, nonlinear load mode, and constant power load mode.

[0114] The control commands include: current operating mode, test requirements, voltage level range, first number of solid-state circuit breakers to be closed, second number of solid-state contactors to be closed, first number of load modules required, first connection method of each load module if there are multiple load modules, second number of load boxes required, and second connection method of each load box if there are multiple load boxes; the target circuit breaker is obtained from three solid-state circuit breakers based on the control commands; the target solid-state contactor is obtained from the solid-state contactor of at least one load module based on the control commands; for each operating mode, after configuration, the load of the load box is consistent with the load of the corresponding device under test.

[0115] The control device 201 is also used to monitor the operation of the dry load and send the operation status to the load protection device 203.

[0116] Load protection device 203 is used to protect dry load 202 based on operating conditions.

[0117] In one specific embodiment, the control device 201 is connected to the controller of the dry load 202; the controller is used to close the target circuit breaker and the target solid contactor by means of control commands.

[0118] In one specific embodiment, the control device 201 includes a display screen for displaying operating status.

[0119] The operational status includes: current operating mode, test requirements, voltage level range, first number of solid-state circuit breakers to close, second number of solid-state contactors to close, first number of load modules required, first connection method of each load module when there are multiple load modules, second number of load boxes required, second connection method of each load box when there are multiple load boxes, voltage, current, frequency, etc. corresponding to each load branch.

[0120] In existing technologies, medium and high voltage contactors employ traditional mechanical structures, and their rated operating voltage is limited by the overall structure of the equipment and cannot be changed. To address the technical challenges of load circuit interruption control at higher voltage levels, this application adopts the following... Figure 3 The solid-state contactor shown employs power electronic devices (such as IGBTs, MOSFETs, and GTOs) connected in series for fuse protection, then in parallel with an absorption module; its on / off state is controlled by a drive control module located at the drive point. Based on the characteristics of series voltage division and parallel current division, a dry-type load switch array is formed through series and parallel connections to achieve load circuit control under medium-to-high voltage levels or medium-to-high current conditions. Leveraging the advantages of power electronic devices such as fast response and synchronization signals, it enables functionality in various operating modes including multi-voltage levels, pulse load simulation, constant load regulation, and AC / DC load compatibility.

[0121] Finally, it should be noted that the above are merely preferred embodiments of this application, and this application is not limited to the above embodiments. It is understood that other improvements and variations that can be directly derived or conceived by those skilled in the art without departing from the spirit and concept of this application should be considered to be included within the protection scope of this application.

Claims

1. A general-purpose dry-type load for medium and high voltage and multiple operating modes, characterized in that, include: At least one load cell, each load cell comprising: three solid-state circuit breakers and at least one load module, the solid-state circuit breakers and the load module being connected via a busbar; Each load module includes three load branches, each load branch including a fuse, a solid-state contactor, and a resistor, wherein the resistors corresponding to the three load branches are the same; By controlling the target circuit breaker and the target solid-state contactor, the load bank is configured to operate in one of the following modes: DC load mode, AC load mode, high-power pulse load mode, nonlinear load mode, and constant power load mode. The control commands include any one or more of the following: current operating mode, test requirements, voltage level range, first number of closed solid-state circuit breakers, second number of closed solid-state contactors, first number of required load modules, first connection method of each load module when there are multiple load modules, second number of required load boxes, and second connection method of each load box when there are multiple load boxes. The target circuit breaker is obtained from three solid-state circuit breakers based on the control command; the target solid-state contactor is obtained from a solid-state contactor of at least one load module based on the control command. Among them, the high-power pulse load working mode is to enable the load module to simulate the device under test based on high-power pulse technology, including: devices for simulating high-power linear motors and devices for simulating high-power instantaneous charging conditions. In this mode, the target circuit breaker is closed, and all target solid-state contactors are closed in a unified manner. After the solid-state contactors are closed, the total power of the load module that can form a circuit is consistent with the power of the device under test. After a preset time, all target solid-state contactors are simultaneously disconnected based on the shutdown signal carried by the control command, so as to realize the simulation of high-power load. The nonlinear load operating mode simulates the nonlinear load by controlling the on / off state of the solid-state contactor to simulate the full-bridge rectifier circuit. This includes: in the nonlinear load operating mode, the target circuit breaker is closed first, and the three-phase voltage waveform at the input terminal of the dry load is collected using a voltage sensor. The target solid-state contactor is closed to simulate the full-bridge rectifier circuit based on the analysis results of the three-phase voltage waveform to simulate the nonlinear load. Among them, the constant power load working mode is to put the solid-state contactor in pulse width modulation mode, including: in the constant power load working mode, by controlling the on and off of the solid-state contactor to output different PWM waves to adjust the average value of the output voltage of each resistor, and by combining the load branch with constant resistance value to realize the dynamic output adjustment of the voltage across the load, so as to realize the constant power operation of the load under different input voltages. For each operating mode, after configuration, the load of the load cell is consistent with the load of the corresponding device under test.

2. The medium-high voltage and multi-operating-mode universal dry load according to claim 1, characterized in that, The target circuit breaker includes any two of the three solid-state circuit breakers, and the target solid-state contactor includes a solid-state contactor in the load branch corresponding to the target circuit breaker, determined from at least one load module. The target circuit breakers include: a first circuit breaker and a second circuit breaker; For a load module, the target solid-state contactor includes: a first solid-state contactor and a second solid-state contactor; The control command closes the target circuit breaker and the target solid-state contactor, connecting the positive terminal of the power supply to the load branch corresponding to the first circuit breaker and the negative terminal of the power supply to the load branch corresponding to the second circuit breaker. The control command is used to indicate that the current working mode is the DC load working mode, the first number of shutdowns is two, and the second number of shutdowns, the first quantity, the first connection method, the second quantity, and the second connection method are determined based on the voltage level range of the device under test.

3. The medium-high voltage and multi-operating-mode universal dry load according to claim 1, characterized in that, The target circuit breaker includes: three solid-state circuit breakers, and the target solid-state contactor includes: solid-state contactors for three load branches determined from at least one load module; The target circuit breaker is closed first via the control command, and all target solid-state contactors are closed simultaneously. The control command is used to indicate that the current working mode is the AC load working mode, the first number of shutdowns is three, and the second number of shutdowns, the first quantity, the first connection method, the second quantity, and the second connection method are determined based on the voltage level range of the device under test.

4. The medium-high voltage and multi-operating-mode universal dry load according to claim 1, characterized in that, The target circuit breaker includes: three solid-state circuit breakers, and the target solid-state contactor includes: solid-state contactors for three load branches determined from at least one load module; The control command prioritizes closing the target circuit breaker, simultaneously closing all the target solid-state contactors, and after a preset time, simultaneously opening all the target solid-state contactors. The control command is used to indicate that the current working mode is the high-power pulse load working mode, the first number of shutdowns is three, and the second number of shutdowns, the first quantity, the first connection method, the second quantity, and the second connection method are determined based on the voltage level range of the device under test.

5. The medium-high voltage and multi-operating-mode universal dry load according to claim 1, characterized in that, The target circuit breaker includes: three solid-state circuit breakers, and the target solid-state contactor includes: solid-state contactors for two load branches determined from at least one load module; The control command is used to close the target circuit breaker first, and then close all the target solid-state contactors. The control command is used to indicate that the current working mode is the nonlinear load working mode. The test requirements are: the first number of shutdowns is three, and the second number of shutdowns, the first quantity, the first connection method, the second quantity, and the second connection method are determined based on the voltage level range of the device under test. The testing requirements include simulating a full-bridge rectifier circuit by controlling the on / off state of the target solid-state contactor.

6. The medium-high voltage and multi-operating-mode universal dry load according to claim 1, characterized in that, The target circuit breaker includes: three solid-state circuit breakers, and the target solid-state contactor includes: solid-state contactors for three load branches determined from at least one load module; The target circuit breaker is closed first by means of the control command, and different numbers of the target solid-state contactors are closed sequentially within a preset time period. The control command is used to indicate that the current working mode is the constant power load working mode. The test requirements are: the first number of shutdowns is three, and the second number of shutdowns, the first quantity, the first connection method, the second quantity, and the second connection method are determined based on the voltage level range of the device under test. The testing requirements include adjusting the output voltage of the load module to enable the load bank to operate at constant power under different input voltages.

7. The medium-high voltage and multi-operating-mode universal dry load according to any one of claims 1-6, characterized in that, Dry loads also include: controllers; The solid-state circuit breaker and the solid-state contactor are connected to the controller; The controller is used to close the target circuit breaker and the target solid-state contactor by means of the control command.

8. A load control system based on any one of claims 1-7 for medium-high voltage and multi-operating-mode general-purpose dry loads, characterized in that, include: Control devices, dry loads and load protection devices; The control device and the dry load are respectively connected to the load protection device; The control device is used to generate control commands based on the current operating conditions and send the control commands to the dry load; The dry load is used to close the target circuit breaker and the target solid-state contactor by control commands to configure the load box to operate in one of the following modes: DC load mode, AC load mode, high-power pulse load mode, nonlinear load mode, and constant power load mode. The control commands include any one or more of the following: current operating mode, test requirements, voltage level range, first number of solid-state circuit breakers to be closed, second number of solid-state contactors to be closed, first number of required load modules, first connection method of each load module if there are multiple load modules, second number of required load boxes, and second connection method of each load box if there are multiple load boxes; the target circuit breaker is obtained from three solid-state circuit breakers based on the control commands; the target solid-state contactor is obtained from the solid-state contactor of at least one load module based on the control commands; for each operating mode, after configuration, the load of the load box is consistent with the load of the corresponding device under test; Among them, the high-power pulse load working mode is to enable the load module to simulate the device under test based on high-power pulse technology, including: devices for simulating high-power linear motors and devices for simulating high-power instantaneous charging conditions. In this mode, the target circuit breaker is closed, and all target solid-state contactors are closed in a unified manner. After the solid-state contactors are closed, the total power of the load module that can form a circuit is consistent with the power of the device under test. After a preset time, all target solid-state contactors are simultaneously disconnected based on the shutdown signal carried by the control command, so as to realize the simulation of high-power load. The nonlinear load operating mode simulates the nonlinear load by controlling the on / off state of the solid-state contactor to simulate the full-bridge rectifier circuit. This includes: in the nonlinear load operating mode, the target circuit breaker is closed first, and the three-phase voltage waveform at the input terminal of the dry load is collected using a voltage sensor. The target solid-state contactor is closed to simulate the full-bridge rectifier circuit based on the analysis results of the three-phase voltage waveform to simulate the nonlinear load. Among them, the constant power load working mode is to put the solid-state contactor in pulse width modulation mode, including: in the constant power load working mode, by controlling the on and off of the solid-state contactor to output different PWM waves to adjust the average value of the output voltage of each resistor, and by combining the load branch with constant resistance value to realize the dynamic output adjustment of the voltage at both ends of the load DC, so as to realize the constant power operation of the load under different input voltages. The control device is also used to monitor the operation of the dry load and send the operation status to the load protection device; The load protection device is used to protect the dry load based on the operating conditions.

9. The load control system according to claim 8, characterized in that, The control device is connected to the controller of the dry load; The controller is used to close the target circuit breaker and the target solid-state contactor by means of control commands.

10. The load control system according to claim 8, characterized in that, The control device includes a display screen, which is used to display the operating status.

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