Medium-high voltage and multi-working-mode universal dry type load and load control system

Abstract

The invention discloses a middle-high voltage and multi-working-mode universal dry load and a load control system, and relates to the technical field of power electronic equipment, the dry load comprises at least one load box, and each load box comprises three solid-state circuit breakers and at least one load module; each load module comprises three load branches, and each load branch comprises a fuse, a solid-state contactor and a resistor; and closing the target circuit breaker and the target solid-state contactor through the control instruction so as to configure the load box to be in one of a direct-current on-load working mode, an alternating-current on-load working mode, a high-power pulse load working mode, a nonlinear load working mode and a constant-power load working mode. The problem that a dry load in the prior art is limited in use voltage, single in function and low in response speed is solved, it is guaranteed that the dry load is suitable for the medium-high voltage range, and the functional diversity and the response speed of the dry load are improved.

Description

Technical Field

[0001] The present application relates to the technical field of power electronic equipment, and in particular to a medium-high voltage and multi-working mode universal dry load and a load control system. Background Art

[0002] Existing medium voltage dry loads are limited by the voltage level, load structure and device performance of the switching device, so that they can only operate within a limited voltage level range and working mode, and can only simulate a single resistive load and an inductive load.

[0003] For the voltage level range: limited by the medium-voltage dry load, the medium- and high-voltage contactors are mainly used as the technical means for load circuit switch control. The maximum voltage level of the contactor products used for medium-voltage DC does not exceed DC3600V; the maximum voltage level of the contactor products used for medium-voltage AC does not exceed AC10.5kV, and medium-voltage DC contactors and medium-voltage AC contactor products cannot be used interchangeably. It can be seen that the limitation of the voltage level range of the contactor directly limits the rated voltage of the product to around DC3600V and AC10.5kV. When there are dry loads with higher voltage levels (high-voltage dry loads) in use, it can only be achieved by adding additional components, such as DC / DC modules and transformers.

[0004] Regarding the working mode: Since the existing medium-voltage dry load uses traditional electrical disconnecting devices such as vacuum circuit breakers and receivers to control the load circuit, the existing medium-voltage dry load has the defects of single function and slow response speed due to the response speed and inherent mechanical characteristics of the device. Summary of the invention

[0005] In response to the above-mentioned problems and technical needs, the applicant has proposed a medium-high voltage and multi-working mode universal dry load and load control system to solve the problems of limited voltage, single function and slow response speed of dry loads in the prior art, ensure that the dry load is suitable for the medium and high voltage range, and improve the functional diversity and response speed of the dry load.

[0006] The embodiment of the present application provides a medium-high voltage and multi-working mode universal dry load, comprising: at least one load box, each of the load boxes comprising: three solid-state circuit breakers and at least one load module, the solid-state circuit breakers and the load modules being connected via a busbar;

[0007] Each of the load modules comprises: three load branches, each of the load branches comprises: a fuse, a solid-state contactor and a resistor, wherein the resistors corresponding to the three load branches are the same;

[0008] By means of control instructions, the target circuit breaker and the target solid-state contactor are closed to configure the load box to be in one of a DC load working mode, an AC load working mode, a high-power pulse load working mode, a nonlinear load working mode and a constant power load working mode;

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

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

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

[0012] According to the medium-high voltage and multi-operating mode universal dry load provided by the embodiment of the present application, the target circuit breaker includes: any two solid-state circuit breakers among the three solid-state circuit breakers, and the target solid-state contactor includes: a solid-state contactor in a load branch corresponding to the target circuit breaker determined from at least one load module;

[0013] The target circuit breaker includes: 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] By means of the control instruction, the target circuit breaker and the target solid-state contactor are closed, so that the positive pole of the power supply is connected to the load branch corresponding to the first circuit breaker, and the negative pole of the power supply is connected to the load branch corresponding to the second circuit breaker;

[0016] Among them, the control instruction is used to indicate that the current working mode is the DC load mode, the first shutdown number is two, and the second shutdown number, 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 universal dry load provided in the embodiment of the present application, the target circuit breaker includes: three solid-state circuit breakers, and the target solid-state contactor includes: solid-state contactors of three load branches determined from at least one load module;

[0018] By means of the control instruction, the target circuit breaker is preferentially closed, and all the target solid-state contactors are closed simultaneously;

[0019] Among them, the control instruction is used to indicate that the current working mode is the AC load mode, the first shutdown number is three, and the second shutdown number, 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 universal dry load provided in the embodiment of the present application, the target circuit breaker includes: three solid-state circuit breakers, and the target solid-state contactor includes: solid-state contactors of three load branches determined from at least one load module;

[0021] By means of the control instruction, the target circuit breaker is closed preferentially, all the target solid-state contactors are closed at the same time, and after a preset time, all the target solid-state contactors are opened at the same time;

[0022] Among them, the control instruction is used to indicate that the current working mode is the high-power pulse load working mode, the first shutdown number is three, and the second shutdown number, 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 universal dry load provided in the embodiment of the present application, the target circuit breaker includes: three solid-state circuit breakers, and the target solid-state contactor includes: solid-state contactors of two load branches determined from at least one load module;

[0024] By means of the control instruction, the target circuit breaker is preferentially closed, and all the target solid-state contactors are closed;

[0025] Wherein, the control instruction is used to indicate that the current working mode is the nonlinear load working mode, the test requirement, the first closed number is three, the second closed number determined based on the voltage level range of the device under test, the first quantity, the first connection mode, the second quantity and the second connection mode;

[0026] The test requirement includes simulating a full-bridge rectifier circuit by using the on-off control of the target solid-state contactor.

[0027] According to the medium-high voltage and multi-operating mode universal dry load provided in the embodiment of the present application, the target circuit breaker includes: three solid-state circuit breakers, and the target solid-state contactor includes: solid-state contactors of three load branches determined from at least one load module;

[0028] By means of the control instruction, the target circuit breaker is closed preferentially, and different numbers of the target solid-state contactors are closed sequentially within a preset time period;

[0029] Wherein, the control instruction is used to indicate that the current working mode is the constant power load working mode, the test requirement, the first closed number is three, the second closed number determined based on the voltage level range of the device under test, the first quantity, the first connection mode, the second quantity and the second connection mode;

[0030] The test requirement includes adjusting the output voltage of the load module so that the load box can operate at constant power under different input voltages.

[0031] According to the medium-high voltage and multi-operating mode universal dry load provided in the embodiment of the present application, the dry load 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 through the control instruction.

[0034] The embodiment of the present application also provides a load control system based on the medium-high voltage and multi-working mode universal dry load described in the above embodiment, comprising: 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 a control instruction based on the current operating condition and send the control instruction to the dry load;

[0037] The dry load is used to close the target circuit breaker and the target solid-state contactor through a control instruction to configure the load box to be in one of a DC load working mode, an AC load working mode, a high-power pulse load working mode, a nonlinear load working mode and a constant power load working mode;

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

[0039] The control device is further used to monitor the operating conditions of the dry load and send the operating conditions 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 by the embodiment of the present application, the control device is connected to the controller of the dry load;

[0042] The controller is used for closing a target circuit breaker and a target solid-state contactor through a control command.

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

[0044] The medium-high voltage and multi-working mode universal dry load and load control system provided in the embodiment of the present application, the medium-high voltage and multi-working mode universal dry load includes: at least one load box, each load box includes: three solid-state circuit breakers and at least one load module; the load module includes: three load branches, each load branch includes: a fuse, a solid-state contactor and a resistor, wherein the resistors corresponding to the three load branches are the same. Through control instructions, close the target circuit breaker and the target solid-state contactor to configure the load box to be in one of the DC load working mode, AC load working mode, high-power pulse load working mode, nonlinear load working mode and constant power load working mode; wherein the control instructions include: the current working mode, the test requirements of the device under test, the voltage level range, the first number of closed solid-state circuit breakers, the second number of closed solid-state contactors, 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 any one or more of the second connection methods 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 the control instruction; the target solid-state contactor is obtained from the solid-state contactor of at least one load module based on the control instruction; for each working mode, after the configuration is completed, the load of the load box is consistent with the load of the corresponding device under test. It can be seen that the present application realizes the design of medium and high voltage loads exceeding the withstand voltage of existing switching devices by adopting solid-state circuit breakers instead of traditional vacuum circuit breakers, and controls the on and off of solid-state circuit breakers and solid-state contactors through control instructions to make the load box adapt to the medium and high voltage range and meet the various working modes of the test conditions, thereby realizing the purpose of making the dry load suitable for the medium and high voltage range and improving the functional diversity and response speed of the dry load. BRIEF DESCRIPTION OF THE DRAWINGS

[0045] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0046] Figure 1 It is a structural schematic diagram of a medium-high voltage and multi-working mode universal dry load provided in an embodiment of the present application;

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

[0048] Figure 3 Schematic diagram of the structure of the solid-state contactor provided in the embodiment of the present application. DETAILED DESCRIPTION

[0049] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0050] The embodiment of the present application provides a medium-high voltage and multi-operating mode universal dry load, such as Figure 1 As shown, the dry load includes: at least one load box 1, each load box 1 includes: three solid-state circuit breakers 11 and at least one load module 12, and the solid-state circuit breaker 11 and the load module 12 are connected through a busbar.

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

[0052] Through control instructions, the target circuit breaker and the target solid-state contactor are closed to configure the load box 1 to be in one of the DC load working mode, AC load working mode, high-power pulse load working mode, nonlinear load working mode and constant power load working mode.

[0053] Among them, the control instructions include: the current working mode, the test requirements of the device under test, the voltage level range, the first closed number of solid-state circuit breakers 11, the second closed number of solid-state contactors 1212, the required first number of load modules 12, the first connection method of each load module 12 when there are multiple load modules 12, the required second number of load boxes 1 and the second connection method of each load box 1 when there are multiple load boxes 1, any one or more of them.

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

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

[0056] Wherein, a dry load is obtained by integrating a plurality of load boxes 1 .

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

[0058] Among them, Figure 1 In the figure, one load box 1 and three load modules 12 are used, and the first connection mode of the three load modules 12 is parallel connection. Of course, this is only an example and is not used to limit the protection scope of the present application.

[0059] The present application sets three solid-state circuit breakers 11, corresponding to three busbars (busbar a, busbar b and busbar c) respectively. The purpose of setting three solid-state circuit breakers 11 is to be applicable to both three-phase alternating current and direct current, so as to achieve universal use of alternating current and direct current. The present application sets multiple load boxes 1 and multiple load modules 12, and realizes simulation testing of the equipment under test in multiple working modes by adjusting the first connection mode of each load module 12 and the second connection mode of each load box 1.

[0060] The present application realizes the design of medium and high voltage loads exceeding the withstand voltage of existing switch devices by adopting solid-state circuit breakers instead of traditional vacuum circuit breakers, and makes the load box adapt to the medium and high voltage range and meet various working modes of test conditions by controlling the on and off of solid-state circuit breakers and solid-state contactors, thereby realizing the purpose of making dry loads suitable for the medium and high voltage range and improving the functional diversity and response speed of dry loads.

[0061] The solid-state contactor used in this application is not limited by the voltage level of traditional contactors, and the solid-state contactor has advantages over traditional contactors such as fast shutdown speed and controllable opening and closing, based on which rapid control and multifunctional control of the load circuit are achieved.

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

[0063] The solid-state circuit breaker 11 and the solid-state contactor 1212 of the dry-type load are in a normally open state when not in operation or in an initial state.

[0064] For example, dry load can be used to simulate high-power DC pure resistive load, and can also be used to simulate electrolytic load, etc.

[0065] Specifically, the present application adopts a standard container-type structure for the outer shell of the dry load by comprehensively considering the compactness and safety of the dry load, and is respectively arranged as a control room, a switch room, and a resistor compartment, etc. For the heating part (such as the resistor), a high-temperature resistant insulating plate is used to isolate the resistor wire group and play a supporting role, and the middle of the insulating plate flows out of the maintenance corridor. The external cable is connected to the switch room, and the solid-state circuit breaker 11, the solid-state contactor 1212, the resistor and other equipment are connected through a copper busbar inside the dry load. The copper busbar is fixed to the cabinet body using a high-voltage insulator and is insulated from the cabinet body.

[0066] Among them, the dry load in the application can be suitable for medium and high voltage levels, which 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, when the dry load does not include a controller, the solid-state circuit breaker 11 and the solid-state contactor 1212 can be connected to the controller through an external control device, so that the external control device closes the target circuit breaker and the target solid-state contactor through a control instruction.

[0068] In a specific embodiment, the target circuit breaker includes: any two solid-state circuit breakers among three solid-state circuit breakers, and the target solid-state contactor includes: a solid-state contactor in a 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] Through the control instruction, the target circuit breaker and the target solid-state contactor are closed, so that the positive pole of the power supply is connected to the load branch corresponding to the first circuit breaker, and the negative pole of the power supply is connected to the load branch corresponding to the second circuit breaker.

[0070] Among them, the control instruction is used to indicate that the current working mode is a DC load working mode, the first shutdown number is two, and the second shutdown number, 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 working mode is to detect the performance of the power supply by adjusting the size of 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 a first load branch (a load branch corresponding to bus a) and a second load branch (a load branch corresponding to bus c). The corresponding first solid-state contactors are a solid-state contactor corresponding to bus a and a solid-state contactor corresponding to bus c.

[0073] Specifically, when the control instruction is used to indicate that the current operating mode is the DC load working mode, the first circuit breaker is closed to connect the positive pole of the power supply to the first load branch; the second circuit breaker is closed to connect the negative pole of the power supply to the second load branch, and the first solid-state contactor and the second solid-state contactor are closed to make the load module simulate the operating conditions of the DC load working mode.

[0074] Specifically, in the DC load working mode, the positive pole of the power supply is connected to the connection point of bus a, and the negative pole 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 turned on, and the corresponding resistors are connected in series to the loop.

[0075] In a specific embodiment, the target circuit breakers include: three solid-state circuit breakers, and the target solid-state contactors include: solid-state contactors of three load branches determined from at least one load module.

[0076] Through the control command, the target circuit breaker is closed first, and all the target solid-state contactors are closed at the same time.

[0077] Among them, the control instruction is used to indicate that the current working mode is AC load mode, the first shutdown number is three, and the second shutdown number, 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 working mode is to detect the performance and stability of the device under test by adjusting the voltage, current, power and other parameters corresponding to the dry load. This process is a continuous operation process.

[0079] For example, it is used to simulate three-phase AC loads (such as high-power heaters), and for example, it is used to simulate motors by combining with reactance, etc.

[0080] Specifically, in the AC load working mode, the three-phase power supply is connected to bus a, bus b and bus c respectively. When using load-carrying, first close the three solid-state circuit breakers and keep them closed, and then control the closing and disconnection of the solid-state contactor of each load module (three solid-state contactors of each load module) to achieve the connection and exit of the corresponding resistor. When the resistor needs to be connected, the solid-state contactor is in the on state (closed state), and when the resistor needs to be exited, the corresponding solid-state contactor is disconnected.

[0081] In the AC load working mode, by utilizing the characteristics of the solid-state contactor that can be switched on and off synchronously, multiple solid-state contactors are connected in series and parallel to realize the solid-state contactor function at medium and high voltage levels. The solid-state circuit breaker mainly plays a protective function under abnormal load conditions such as overvoltage, overcurrent, smoke and overtemperature.

[0082] In a specific embodiment, the target circuit breakers include: three solid-state circuit breakers, and the target solid-state contactors include: solid-state contactors of three load branches determined from at least one load module.

[0083] Through the control instruction, the target circuit breaker is closed first, and all the target solid-state contactors are closed at the same time, and after a preset time, all the target solid-state contactors are opened at the same time.

[0084] Among them, the control instruction is used to indicate that the current working mode is a high-power pulse load working mode, the first shutdown number is three, and the second shutdown number, 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 to enable the load module to simulate the device under test based on high-power pulse technology.

[0086] For example, it is used to simulate high-power linear motors, and for example, it is used to simulate high-power instantaneous charging conditions, etc.

[0087] Specifically, in the high-power pulse load working mode, the target circuit breaker is closed first, and all target solid-state contactors are closed uniformly. After the solid-state contactors are closed, the total power corresponding to the load modules that can form a path is consistent with the power of the device under test. After a preset time, all target solid-state contactors are disconnected at the same time based on the shutdown signal carried by the control instruction to achieve the simulation of high-power load.

[0088] The control instruction also includes a shutdown signal.

[0089] Specifically, the on-off times of the solid-state contactor are determined according to the function of the device under test, and the on-off times are iterated. Therefore, the control instruction also includes the on-off times.

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

[0091] Among them, the on-off signal is sent based on the simulation of the actual process and controls the solid-state contactor.

[0092] In a specific embodiment, the target circuit breakers include: three solid-state circuit breakers, and the target solid-state contactors include: solid-state contactors of two load branches determined from at least one load module.

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

[0094] Among them, the control instruction is used to indicate that the current working mode is a nonlinear load working mode, the test requirements, the first shutdown number is three, the second shutdown number, 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] Among them, the test requirements include simulating a full-bridge rectifier circuit using the on-off control of the target solid-state contactor.

[0096] Among them, the nonlinear load working mode is to simulate the nonlinear load by controlling the on-off of the solid-state contactor to simulate the full-bridge rectifier circuit.

[0097] For example, it is used to simulate high-power switching power supply equipment in actual operation (such as high-power inverter, high-power rectifier power supply, etc.).

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

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

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

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

[0102] In a specific embodiment, the target circuit breakers include: three solid-state circuit breakers, and the target solid-state contactors include: solid-state contactors of three load branches determined from at least one load module.

[0103] Through control instructions, the target circuit breaker is closed first, and different numbers of target solid-state contactors are closed in sequence within a preset time period.

[0104] Among them, the control instruction is used to indicate that the current working mode is a constant power load working mode, the test requirements, the first shutdown number is three, the second shutdown number, 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] Among them, the test requirements include adjusting the output voltage of the load module so that the load box can operate at constant power under different input voltages.

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

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

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

[0109] Therefore, when the input voltage of the dry load changes, the constant power operation of the dry load under different input voltages is achieved by adjusting the average value of the output voltage of the load branch (or by connecting or exiting other load instructions and combining with adjusting the average value of the output voltage of its branch).

[0110] The dry load of the present application utilizes a solid-state circuit breaker power electronic solid-state contactor to achieve a medium- and high-voltage load design with a withstand voltage. By utilizing the advantages of the power electronic solid-state contactor, such as flexible voltage levels, fast switching speeds, good synchronization performance, and controllable switching times, the designed load can achieve a variety of operating modes, effectively improving the utilization rate of the load and reducing procurement costs.

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

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

[0113] The dry load 202 is used to close the target circuit breaker and the target solid-state contactor through control instructions to configure the load box to be in one of the DC load working mode, AC load working mode, high-power pulse load working mode, nonlinear load working mode and constant power load working mode.

[0114] Among them, the control instructions include: the current working mode, test requirements, voltage level range, the first number of closed solid-state circuit breakers, the second number of closed solid-state contactors, 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, any one or more of them; the target circuit breaker is obtained from three solid-state circuit breakers based on the control instructions; the target solid-state contactor is obtained from the solid-state contactor of at least one load module based on the control instructions; for each working mode, after configuration is completed, 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 operating status of the dry load and send the operating status to the load protection device 203.

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

[0117] In a specific embodiment, the control device 201 is connected to a controller of a dry load 202; the controller is used to close a target circuit breaker and a target solid-state contactor through a control instruction.

[0118] In a specific embodiment, the control device 201 includes a display screen, and the display screen is used to display the operating status.

[0119] Among them, the operating conditions include: the current working mode, test requirements, voltage level range, the first closed number of solid-state circuit breakers, the second closed number of solid-state contactors, 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, the second connection method of each load box when there are multiple load boxes, the voltage, current, frequency corresponding to each load branch, etc.

[0120] In the prior art, medium and high voltage contactors use traditional mechanical structures, and the rated working voltage is limited by the overall structure of the equipment and cannot be changed. In order to solve the technical difficulties of load circuit disconnection control at higher voltage levels. Figure 3 The solid-state contactor shown in the figure adopts power electronic devices (such as IGBT, MOS tube and GTO, etc.) to connect in series with the protection fuse, and then connect in parallel with the absorption module; and the on-off is controlled by the drive control module set at the drive. Based on the characteristics of series voltage division and parallel current division, the switch array of dry load is composed of series and parallel connection to realize the control of the load circuit under medium and high voltage levels or medium and high currents. Based on the advantages of power electronic devices in terms of fast response and synchronous signals, the functions under multiple voltage levels, pulse load simulation, constant load regulation, AC and DC load universal operation modes are realized.

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

Claims

1. A medium-high voltage and multi-working mode universal dry load, characterized in that: include: At least one load box, each of the load boxes comprising: three solid-state circuit breakers and at least one load module, the solid-state circuit breakers and the load modules being connected via a busbar; Each of the load modules comprises: three load branches, each of the load branches comprises: a fuse, a solid-state contactor and a resistor, wherein the resistors corresponding to the three load branches are the same; By means of control instructions, the target circuit breaker and the target solid-state contactor are closed to configure the load box to be in one of a DC load working mode, an AC load working mode, a high-power pulse load working mode, a nonlinear load working mode and a constant power load working mode; The control instruction includes: any one or more of the current working mode, test requirements, voltage level range, the first closed number of the solid-state circuit breakers, the second closed number of the solid-state contactors, the required first number of load modules, the first connection mode of each load module when there are multiple load modules, the required second number of load boxes, and the second connection mode of each load box when there are multiple load boxes; Wherein, the target circuit breaker is obtained from three solid-state circuit breakers based on the control instruction; the target solid-state contactor is obtained from a solid-state contactor of at least one load module based on the control instruction; For each working mode, after configuration is completed, the load of the load box is consistent with the load of the corresponding device under test.

2. The medium-high voltage and multi-working mode universal dry load according to claim 1 is characterized in that: The target circuit breaker includes: any two solid-state circuit breakers among the three solid-state circuit breakers, and the target solid-state contactor includes: a solid-state contactor in a 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; By means of the control instruction, the target circuit breaker and the target solid-state contactor are closed, so that the positive pole of the power supply is connected to the load branch corresponding to the first circuit breaker, and the negative pole of the power supply is connected to the load branch corresponding to the second circuit breaker; Among them, the control instruction is used to indicate that the current working mode is the DC load mode, the first shutdown number is two, and the second shutdown number, 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-working 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 of three load branches determined from at least one load module; By means of the control instruction, the target circuit breaker is preferentially closed, and all the target solid-state contactors are closed simultaneously; Among them, the control instruction is used to indicate that the current working mode is the AC load mode, the first shutdown number is three, and the second shutdown number, 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-working 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 of three load branches determined from at least one load module; By means of the control instruction, the target circuit breaker is closed preferentially, all the target solid-state contactors are closed at the same time, and after a preset time, all the target solid-state contactors are opened at the same time; Among them, the control instruction is used to indicate that the current working mode is the high-power pulse load working mode, the first shutdown number is three, and the second shutdown number, 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-working mode universal dry load according to claim 1, characterized in that: The target circuit breakers include: three solid-state circuit breakers, and the target solid-state contactors include: solid-state contactors of two load branches determined from at least one load module; By means of the control instruction, the target circuit breaker is preferentially closed, and all the target solid-state contactors are closed; Wherein, the control instruction is used to indicate that the current working mode is the nonlinear load working mode, the test requirement, the first closed number is three, the second closed number determined based on the voltage level range of the device under test, the first quantity, the first connection mode, the second quantity and the second connection mode; The test requirement includes simulating a full-bridge rectifier circuit by using the on-off control 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 of three load branches determined from at least one load module; By means of the control instruction, the target circuit breaker is closed preferentially, and different numbers of the target solid-state contactors are closed sequentially within a preset time period; Wherein, the control instruction is used to indicate that the current working mode is the constant power load working mode, the test requirement, the first closed number is three, the second closed number determined based on the voltage level range of the device under test, the first quantity, the first connection mode, the second quantity and the second connection mode; The test requirement includes adjusting the output voltage of the load module so that the load box can 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 to 6, characterized in that: The dry load also includes: a controller; 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 through the control instruction.

8. A load control system for a medium-high voltage and multi-working mode universal dry load based on any one of claims 1 to 7, characterized in that: include: controls, 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 a control instruction based on the current operating condition and send the control instruction to the dry load; The dry load is used to close the target circuit breaker and the target solid-state contactor through a control instruction to configure the load box to be in one of a DC load working mode, an AC load working mode, a high-power pulse load working mode, a nonlinear load working mode and a constant power load working mode; The control instruction includes: any one or more of the current working mode, test requirements, voltage level range, the first closed number of the solid-state circuit breakers, the second closed number of the solid-state contactors, the first number of required load modules, the first connection mode of each load module when there are multiple load modules, the second number of required load boxes, and the second connection mode 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 instruction; the target solid-state contactor is obtained from the solid-state contactor of at least one load module based on the control instruction; for each working mode, after configuration is completed, the load of the load box is consistent with the load of the corresponding device under test; The control device is further used to monitor the operating conditions of the dry load and send the operating conditions 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 for closing a target circuit breaker and a target solid-state contactor through a control command.

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

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