A control method and control system for a power regulator

Abstract

The application discloses a control method and a control system of a power regulator, wherein the control method of the power regulator monitors external load variation of the power regulator in real time, controls a main converter in the power regulator to be in an idle running state when energy regulation is not needed, ensures that the power regulator provides necessary voltage sources, controls a slave converter in the power regulator to be in a stable intermediate voltage state, avoids unnecessary energy loss caused by frequent zero-crossing turn-on and turn-off of IGBT devices of the slave converter, and avoids unnecessary service life loss of the IGBT devices in the slave converter.

Description

Technical Field

[0001] This application relates to the field of automatic control technology, and more specifically, to a control method and control system for a power regulator. Background Technology

[0002] In the field of rail transit, power regulators are connected in parallel to the railway traction power supply system. They are capable of solving power quality problems in electrified railways, real-time monitoring of traction loads to transfer energy, suppressing negative sequence current on the grid side, reducing voltage imbalance on the grid side, realizing dynamic adjustment of traction grid voltage, power factor control, reactive power compensation, and improving power supply adaptability.

[0003] In practical applications, because electrified railways adopt a single-phase, segmented power supply structure, and trains are impulsive and intermittent loads, the power regulators are connected in parallel to the railway traction power supply system. Most requests are for no-load operation. The IGBT (Insulated Gate Bipolar Transistor) components inside the power regulator converter are constantly switching on and off as the current crosses zero, which greatly reduces the lifespan of electronic switching components. The power regulator needs to continuously consume the energy of the railway traction power supply system to maintain the converter's long-term no-load operation, resulting in a huge waste of energy. Summary of the Invention

[0004] To address the aforementioned technical problems, this application provides a control method and control system for a power regulator, aiming to save energy waste during the operation of the power regulator and avoid unnecessary power loss caused by the long-term no-load operation of the power regulator's converter.

[0005] To achieve the above technical objectives, the embodiments of this application provide the following technical solutions:

[0006] A control method for a power regulator, used to control a power regulator including multiple converters, the control method for the power regulator comprising:

[0007] The external load change of the power regulator is obtained;

[0008] Based on the changes in the external load, it is determined whether energy regulation is required. If not, the main converter in the power regulator is controlled to operate under no-load conditions, and the slave converter in the power regulator is controlled to operate under stable intermediate voltage conditions. If yes, the inverter module pulse and rectifier module pulse are output to the power regulator to drive the power regulator to respond to the changes in the external load.

[0009] Optionally, determining whether energy regulation is needed based on the change in external load includes:

[0010] When the duration of all converters of the power regulator being in no-load operation exceeds a preset time threshold, it is determined that energy regulation is required.

[0011] Optionally, the power regulator includes multiple converters numbered from 1 to N, where N is an integer greater than 1; at any given time, the number of main converters in the power regulator is 1, and the number of slave converters is N-1.

[0012] Optional, also includes:

[0013] When preset conditions are met, the main converter numbered i is set as the slave converter, and when i = N, the slave converter numbered 1 is set as the main converter. When i < N, the slave converter numbered i+1 is set as the main converter. The preset conditions include: when the current main converter fails or when the control of the slave converter in the power regulator changes from being in a stable intermediate voltage state to outputting inverter module pulses and rectifier module pulses to the power regulator.

[0014] Optionally, controlling the main converter in the power regulator to operate under no-load conditions and controlling the slave converter in the power regulator to operate under stable intermediate voltage conditions includes:

[0015] The main converter in the power regulator is controlled to operate under no-load conditions in order to establish the output grid voltage;

[0016] The inverter module pulses output to the power regulator are blocked, and the rectifier module pulses are output to the power regulator to control the slave converter to be in a stable intermediate voltage state.

[0017] A control system for a power regulator, the control system comprising: a main control system, a slave control system, and a power regulator; wherein,

[0018] The power regulator includes multiple converters;

[0019] The main control system is used to acquire the external load change of the power regulator and determine whether energy regulation is required based on the external load change. If not, it sends a standby flag bit to the slave control system; if so, it sends a run flag bit to the slave control system.

[0020] The slave control system is configured to, upon receiving the standby flag, control the main converter in the power regulator to operate under no-load conditions and control the slave converter in the power regulator to operate under stable intermediate voltage conditions, and upon receiving the operating flag, output inverter module pulses and rectifier module pulses to the power regulator to drive the power regulator to respond to the external load changes.

[0021] Optionally, the main control system determines whether energy regulation is needed based on the external load change. Specifically, when the duration of all converters of the power regulator being in no-load operation exceeds a preset time threshold, it determines that energy regulation is needed.

[0022] Optionally, the power regulator includes multiple converters numbered from 1 to N, where N is an integer greater than 1; at any given time, the number of main converters in the power regulator is 1, and the number of slave converters is N-1.

[0023] Optionally, the slave control system is further configured to set the master converter numbered i as a slave converter when a preset condition is met, and to set the slave converter numbered 1 as a master converter when i = N, and to set the slave converter numbered i+1 as a master converter when i < N; the preset condition includes: the current master converter is faulty or the rising edge of the operation flag bit is received.

[0024] Optionally, when the slave control system receives the standby flag, it controls the main converter in the power regulator to operate under no-load conditions and controls the slave converter in the power regulator to operate under a stable intermediate voltage state. Specifically, this is used to...

[0025] Upon receiving the standby flag, the main converter in the power regulator is controlled to operate under no-load conditions in order to establish the output grid voltage.

[0026] The inverter module pulses output to the power regulator are blocked, and the rectifier module pulses are output to the power regulator to control the slave converter to be in a stable intermediate voltage state.

[0027] A control system for a power regulator, used to control a power regulator including multiple converters, the control system for the power regulator comprising:

[0028] The load acquisition module is used to acquire changes in the external load of the power regulator;

[0029] The status control module is used to determine whether energy regulation is required based on the changes in the external load. If not, it controls the main converter in the power regulator to operate under no-load conditions and controls the slave converter in the power regulator to operate under stable intermediate voltage conditions. If yes, it outputs inverter module pulses and rectifier module pulses to the power regulator to drive the power regulator to respond to the changes in the external load.

[0030] Optionally, the state control module determines whether energy regulation is needed based on the external load change. Specifically, when all converters of the power regulator have been running under no-load conditions for a duration exceeding a preset time threshold, it determines that energy regulation is needed.

[0031] Optionally, the power regulator includes multiple converters numbered from 1 to N, where N is an integer greater than 1; at any given time, the number of main converters in the power regulator is 1, and the number of slave converters is N-1.

[0032] Optional, also includes:

[0033] The master-slave conversion module is used to set the master converter numbered i as a slave converter when a preset condition is met, and to set the slave converter numbered 1 as a master converter when i = N, and to set the slave converter numbered i+1 as a master converter when i < N. The preset conditions include: the current master converter is faulty or the control of the slave converter in the power regulator is changed from being in a stable intermediate voltage state to outputting inverter module pulses and rectifier module pulses to the power regulator.

[0034] Optionally, the state control module controls the main converter in the power regulator to be in an unloaded operating state and controls the slave converter in the power regulator to be in a stable intermediate voltage state. Specifically, it controls the main converter in the power regulator to be in an unloaded operating state in order to establish the output side grid voltage.

[0035] The inverter module pulses output to the power regulator are blocked, and the rectifier module pulses are output to the power regulator to control the slave converter to be in a stable intermediate voltage state.

[0036] As can be seen from the above technical solutions, the embodiments of this application provide a control method and control system for a power regulator. The control method of the power regulator monitors the changes in the external load of the power regulator in real time, and when energy regulation is not required, it controls only the main converter in the power regulator to be in an unloaded operating state to ensure that the power regulator provides the necessary voltage source, and controls the slave converter in the power regulator to be in a stable intermediate voltage state, so as to avoid frequent zero-crossing switching of the IGBT devices in the slave converter, which would cause unnecessary energy loss, and also avoid unnecessary life loss of the IGBT devices in the slave converter. Attached Figure Description

[0037] 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 only embodiments of this application. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0038] Figure 1 A schematic flowchart illustrating a control method for a power regulator provided in one embodiment of this application;

[0039] Figure 2 A schematic diagram of a multiple converter in a power regulator provided for one embodiment of this application;

[0040] Figure 3 This is a schematic diagram of the control system of a power regulator provided in one embodiment of this application. Detailed Implementation

[0041] 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, and 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 application.

[0042] This application provides a control method for a power regulator, used to control a power regulator including multiple converters, such as... Figure 1 As shown, the control method of the power regulator includes:

[0043] S101: Obtain the external load change of the power regulator;

[0044] S102: Based on the change in external load, determine whether energy regulation is required. If not, control the main converter in the power regulator to operate under no-load conditions and control the slave converter in the power regulator to operate under stable intermediate voltage conditions. If yes, output inverter module pulses and rectifier module pulses to the power regulator to drive the power regulator to respond to the change in external load.

[0045] refer to Figure 2 , Figure 2 A schematic diagram of a power regulator including multiple converters is shown. Multiple converters can be understood as multiple converters arranged in parallel. Figure 2 Only a triple converter is shown in the figure, but in actual applications, the number of converters in the power regulator can also be 4, 5, etc., and this application does not limit this. Figure 2In the diagram, reference numeral 10 indicates the converter.

[0046] Generally, when no energy regulation is required and the power regulator is used as a voltage source in the railway traction power supply system, only one converter in the power regulator needs to be kept in an unloaded state to establish the output grid voltage, while the other converters can be in a stable intermediate voltage state to reduce the overall energy consumption of the power regulator. Specifically, in one embodiment of this application, the multiple converters included in the power regulator are numbered from 1 to N, where N is an integer greater than 1; at any given time, the number of main converters in the power regulator is 1, and the number of slave converters is N-1.

[0047] The inverter module in the power regulator is used to receive pulses from the inverter module, and the thyristors in the inverter module are turned on or off under the control of the inverter module pulses. The rectifier module in the power regulator is used to receive pulses from the rectifier module, and the thyristors in the rectifier module are turned on or off under the control of the rectifier module pulses.

[0048] Based on the above embodiments, in one embodiment of this application, the control method of the power regulator further includes:

[0049] S103: When a preset condition is met, the main converter numbered i is set as a slave converter, and when i = N, the slave converter numbered 1 is set as the main converter, and when i < N, the slave converter numbered i+1 is set as the main converter; the preset condition includes: when the current main converter fails or when the control of the slave converter in the power regulator changes from being in a stable intermediate voltage state to outputting inverter module pulses and rectifier module pulses to the power regulator.

[0050] In this embodiment, to avoid excessive losses caused by the same converter continuously operating as the main converter, when a preset condition is met, another converter is used as the new main converter to replace the current main converter.

[0051] Based on the above embodiments, in another embodiment of this application, controlling the main converter in the power regulator to operate under no-load conditions and controlling the slave converter in the power regulator to operate under stable intermediate voltage conditions includes:

[0052] The main converter in the power regulator is controlled to operate under no-load conditions in order to establish the output grid voltage;

[0053] The inverter module pulses output to the power regulator are blocked, and the rectifier module pulses are output to the power regulator to control the slave converter to be in a stable intermediate voltage state.

[0054] In this embodiment, the inverter module pulses output to the power regulator are blocked, that is, the inverter module pulses are not output to the power regulator, so that the inverter module of the power regulator stops working.

[0055] The control system of the power regulator provided in the embodiments of this application is described below. The control system of the power regulator described below can be referred to in correspondence with the control method of the power regulator described above.

[0056] Accordingly, embodiments of this application also provide a control system for a power regulator, such as... Figure 3 As shown, it includes: a main control system 20, a slave control system 30, and a power regulator; wherein,

[0057] The power regulator includes multiple converters;

[0058] The main control system 20 is used to acquire the external load change of the power regulator and determine whether energy regulation is required based on the external load change. If not, it sends a standby flag bit to the slave control system 30; if so, it sends a running flag bit to the slave control system 30.

[0059] The slave control system 30 is configured to, upon receiving the standby flag, control the main converter in the power regulator to operate under no-load conditions and control the slave converter in the power regulator to operate under stable intermediate voltage conditions, and upon receiving the operating flag, output inverter module pulses and rectifier module pulses to the power regulator to drive the power regulator to respond to the external load changes.

[0060] The number of slave control systems 30 is the same as the number of converters in the power regulator, with one slave control system 30 corresponding to one converter. Each converter includes a converter module, a rectifier module, and an inverter module. Figure 3 In the diagram, CU1 represents the converter module, CU2 represents the rectifier module, and CU3 and CU4 represent the inverter module.

[0061] In addition to the functions mentioned above, the main control system 20 is also primarily responsible for performing real-time control and protection at the top level of the device system. Specifically, it includes functions such as traction network voltage / current signal acquisition, load-side voltage and current signal acquisition and power calculation, power flow distribution of converter units, water cooling system control, device system-level protection, and external communication.

[0062] In addition to the aforementioned control functions, the slave control system 30 is also responsible for the output current control, intermediate DC voltage control, and converter body protection of the AC-DC-AC converter unit. The slave control system 30 is responsible for the control of the single AC-DC-AC converter.

[0063] also, Figure 3 The diagram also shows a remote monitoring system 40, which interacts with the main control system 20 to enable remote monitoring of the power regulator's control system.

[0064] Optionally, the main control system 20 determines whether energy regulation is needed based on the external load change. Specifically, when the duration of all converters of the power regulator being in no-load operation exceeds a preset time threshold, it determines that energy regulation is needed.

[0065] Optionally, the power regulator includes multiple converters numbered from 1 to N, where N is an integer greater than 1; at any given time, the number of main converters in the power regulator is 1, and the number of slave converters is N-1.

[0066] Optionally, the slave control system 30 is further configured to set the master converter numbered i as a slave converter when a preset condition is met, and to set the slave converter numbered 1 as a master converter when i = N, and to set the slave converter numbered i+1 as a master converter when i < N; the preset condition includes: the current master converter is faulty or the rising edge of the operation flag bit is received.

[0067] Optionally, when the slave control system 30 receives the standby flag, it controls the main converter in the power regulator to operate under no-load conditions and controls the slave converter in the power regulator to operate under a stable intermediate voltage state. Specifically, this is used to...

[0068] Upon receiving the standby flag, the main converter in the power regulator is controlled to operate under no-load conditions in order to establish the output grid voltage.

[0069] The inverter module pulses output to the power regulator are blocked, and the rectifier module pulses are output to the power regulator to control the slave converter to be in a stable intermediate voltage state.

[0070] The identification of the main converter and the slave converter by the slave control system 30 can also be performed by setting converter flag bits. For example, when the converter flag bit of a certain converter is 1, it is identified as the main converter, and when the converter flag bit of a certain converter is 0, it is identified as the slave converter. At this time, when the slave control system 30 receives the standby flag bit, it controls the main converter with the converter flag bit of 1 to be in no-load operation state in order to establish the output side grid voltage, and controls the main converter with the converter flag bit of 0 to be in stable intermediate voltage state.

[0071] Accordingly, this application also provides a control system for a power regulator, used to control a power regulator including multiple converters, the control system of the power regulator including:

[0072] The load acquisition module is used to acquire changes in the external load of the power regulator;

[0073] The status control module is used to determine whether energy regulation is required based on the changes in the external load. If not, it controls the main converter in the power regulator to operate under no-load conditions and controls the slave converter in the power regulator to operate under stable intermediate voltage conditions. If yes, it outputs inverter module pulses and rectifier module pulses to the power regulator to drive the power regulator to respond to the changes in the external load.

[0074] Optionally, the state control module determines whether energy regulation is needed based on the external load change. Specifically, when all converters of the power regulator have been running under no-load conditions for a duration exceeding a preset time threshold, it determines that energy regulation is needed.

[0075] Optionally, the power regulator includes multiple converters numbered from 1 to N, where N is an integer greater than 1; at any given time, the number of main converters in the power regulator is 1, and the number of slave converters is N-1.

[0076] Optional, also includes:

[0077] The master-slave conversion module is used to set the master converter numbered i as a slave converter when a preset condition is met, and to set the slave converter numbered 1 as a master converter when i = N, and to set the slave converter numbered i+1 as a master converter when i < N. The preset conditions include: the current master converter is faulty or the control of the slave converter in the power regulator is changed from being in a stable intermediate voltage state to outputting inverter module pulses and rectifier module pulses to the power regulator.

[0078] Optionally, the state control module controls the main converter in the power regulator to be in an unloaded operating state and controls the slave converter in the power regulator to be in a stable intermediate voltage state. Specifically, it controls the main converter in the power regulator to be in an unloaded operating state in order to establish the output side grid voltage.

[0079] The inverter module pulses output to the power regulator are blocked, and the rectifier module pulses are output to the power regulator to control the slave converter to be in a stable intermediate voltage state.

[0080] In summary, the embodiments of this application provide a control method and control system for a power regulator. The control method monitors the changes in the external load of the power regulator in real time, and when energy regulation is not required, it controls only the main converter in the power regulator to operate under no-load conditions, ensuring that the power regulator provides the necessary voltage source. It also controls the slave converter in the power regulator to be in a stable intermediate voltage state, avoiding frequent zero-crossing switching of the IGBT devices in the slave converter, which would cause unnecessary energy loss and unnecessary lifespan loss of the IGBT devices in the slave converter.

[0081] The features described in the various embodiments of this specification can be substituted for or combined with each other. Each embodiment focuses on the differences from other embodiments, and the same or similar parts between the various embodiments can be referred to each other.

[0082] The above description of the disclosed embodiments enables those skilled in the art to make or use this application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of this application. Therefore, this application is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A control method for a power regulator, characterized in that, A power regulator comprising multiple converters connected in parallel to a railway traction power supply system, wherein the multiple converters are multiple converters arranged in parallel, and the control method for the power regulator includes: The external load change of the power regulator is obtained; Based on the external load change, it is determined whether energy regulation is required. If not, and the power regulator is used as a voltage source in the railway traction power supply system, the main converter in the power regulator is controlled to operate under no-load conditions, and the slave converter in the power regulator is controlled to operate under a stable intermediate voltage state. If yes, inverter module pulses and rectifier module pulses are output to the power regulator to drive the power regulator to respond to the external load change. The determination of whether energy regulation is required based on the external load change includes: when the duration of no-load operation of all converters of the power regulator exceeds a preset time threshold, it is determined that energy regulation is required. The power regulator includes multiple converters numbered from 1 to N, where N is an integer greater than 1; at any given time, the number of main converters in the power regulator is 1, and the number of slave converters is N-1. When preset conditions are met, the main converter numbered i is set as the slave converter, and when i=N, the slave converter numbered 1 is set as the main converter. When i<N, the slave converter numbered i+1 is set as the main converter. The preset conditions include: when the current main converter fails or when the control of the slave converter in the power regulator changes from being in a stable intermediate voltage state to outputting inverter module pulses and rectifier module pulses to the power regulator.

2. The method according to claim 1, characterized in that, The control of the main converter in the power regulator to be in no-load operation and the control of the slave converter in the power regulator to be in a stable intermediate voltage state include: The main converter in the power regulator is controlled to operate under no-load conditions in order to establish the output grid voltage; The inverter module pulses output to the power regulator are blocked, and the rectifier module pulses are output to the power regulator to control the slave converter to be in a stable intermediate voltage state.

3. A control system for a power regulator, characterized in that, The control system of the power regulator includes: a main control system, a slave control system, and the power regulator; wherein the power regulator is connected in parallel to the railway traction power supply system; The power regulator includes multiple converters; the multiple converters included in the power regulator are numbered from 1 to N, where N is an integer greater than 1; at any given time, the number of main converters in the power regulator is 1, and the number of slave converters is N-1; the multiple converters are multiple converters arranged in parallel. The main control system is used to acquire changes in the external load of the power regulator and determine whether energy regulation is required based on these changes. If not, and the power regulator is used as a voltage source in the railway traction power supply system, the main control system sends a standby flag bit to the slave control system. If yes, the main control system sends an operating flag bit to the slave control system. Specifically, the main control system determines whether energy regulation is required based on the external load changes by determining that energy regulation is required when all converters of the power regulator have been in no-load operation for a duration exceeding a preset time threshold. The slave control system is configured to, upon receiving the standby flag, control the main converter in the power regulator to operate under no-load conditions and control the slave converter in the power regulator to operate under stable intermediate voltage conditions, and to, upon receiving the operation flag, output inverter module pulses and rectifier module pulses to the power regulator to drive the power regulator to respond to the external load changes. The slave control system is further configured to set the master converter numbered i as a slave converter when a preset condition is met, and to set the slave converter numbered 1 as a master converter when i=N, and to set the slave converter numbered i+1 as a master converter when i<N; the preset condition includes: the current master converter is faulty or the rising edge of the operation flag bit is received.

4. The system according to claim 3, characterized in that, When the slave control system receives the standby flag, it controls the main converter in the power regulator to operate under no-load conditions and controls the slave converter in the power regulator to operate under stable intermediate voltage conditions. Specifically, this is used for... Upon receiving the standby flag, the main converter in the power regulator is controlled to operate under no-load conditions in order to establish the output grid voltage. The inverter module pulses output to the power regulator are blocked, and the rectifier module pulses are output to the power regulator to control the slave converter to be in a stable intermediate voltage state.

5. A control system for a power regulator, characterized in that, A control system for a power regulator comprising multiple converters connected in parallel to a railway traction power supply system includes: The load acquisition module is used to acquire changes in the external load of the power regulator; the power regulator includes multiple converters numbered from 1 to N, where N is an integer greater than 1; at any given time, the number of main converters in the power regulator is 1, and the number of slave converters is N-1. The state control module is used to determine whether energy regulation is needed based on the external load change. If not, and the power regulator is used as a voltage source in the railway traction power supply system, it controls the main converter in the power regulator to be in an unloaded operating state and controls the slave converter in the power regulator to be in a stable intermediate voltage state. If yes, it outputs inverter module pulses and rectifier module pulses to the power regulator to drive the power regulator to respond to the external load change. Specifically, the state control module determines whether energy regulation is needed based on the external load change by determining that energy regulation is needed when the duration of unloaded operation of all converters in the power regulator exceeds a preset time threshold. The master-slave conversion module is used to set the master converter numbered i as a slave converter when a preset condition is met, and to set the slave converter numbered 1 as a master converter when i=N, and to set the slave converter numbered i+1 as a master converter when i<N. The preset conditions include: the current master converter is faulty or the control of the slave converter in the power regulator is changed from being in a stable intermediate voltage state to outputting inverter module pulses and rectifier module pulses to the power regulator.

6. The system according to claim 5, characterized in that, The state control module controls the main converter in the power regulator to be in an unloaded operating state and controls the slave converter in the power regulator to be in a stable intermediate voltage state. Specifically, it controls the main converter in the power regulator to be in an unloaded operating state in order to establish the output side grid voltage. The inverter module pulses output to the power regulator are blocked, and the rectifier module pulses are output to the power regulator to control the slave converter to be in a stable intermediate voltage state.

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