Power grid power compensation method and device, storage medium and electronic device

Abstract

The invention discloses a power grid power compensation method, which is applied to a controller, and the controller is connected with a power compensation system. The power compensation system comprises a traction transformer and a converter. The converter is connected with the traction transformer through a first power supply arm and a second power supply arm of the traction transformer; the method comprises the following steps: acquiring a first power parameter of a first power supply arm, and acquiring a second power parameter of a second power supply arm; determining a power compensation parameter for performing power compensation on the first power supply arm and the second power supply arm under the condition of determining that a power adjustment condition is met based on the first electric power parameter and the second electric power parameter; the first power supply arm and the second power supply arm are subjected to power compensation based on the power compensation parameter and the converter, namely, the power difference between the two power supply arms (the first power supply arm and the second power supply arm) is adjusted through the calculated power compensation constant and the converter, so that the influence of unbalanced negative sequence voltage is reduced, and the power supply stability is improved.

Claims

1. A power grid power compensation method, applied to a controller, wherein the controller is connected to a power compensation system; the power compensation system comprises: traction transformers and converters; The converter is connected to the traction transformer via the first power supply arm and the second power supply arm of the traction transformer; and is characterized by comprising: Acquire a first power parameter of the first power supply arm, and acquire a second power parameter of the second power supply arm; If it is determined based on the first power parameter and the second power parameter that a power adjustment condition is satisfied, determining a power compensation parameter for performing power compensation on the first power supply arm and the second power supply arm based on the first power parameter and the second power parameter; Power compensation is performed on the first power supply arm and the second power supply arm respectively based on the power compensation parameter and the converter.

2. The method according to claim 1, characterized in that The first power parameter includes: a first power of the first power supply arm; the second power parameter includes: a second power of the second power supply arm; and determining whether the power compensation condition is met includes: determining a first power difference based on the first power and the second power; When the absolute value of the first power difference is greater than a preset power adjustment threshold, it is determined that the power compensation condition is met.

3. The method according to claim 1, characterized in that The first power parameter further includes: a first voltage of the first power supply arm; the second power parameter further includes: a second voltage of the second power supply arm; The determining, based on the first power parameter and the second power parameter, a power compensation parameter for performing power compensation on the first power supply arm and the second power supply arm includes: determining a first voltage difference of the first power supply arm based on the first voltage and a rated voltage; determining a second voltage difference of the second power supply arm based on the second voltage and the rated voltage; Determining a first reactive compensation power as a product of the first pressure difference and a preset first power factor, and determining a second reactive compensation power as a product of the second pressure difference and a preset second power factor; The first reactive compensation power is determined as a power compensation parameter for power compensation of the first power supply arm, and the second reactive compensation power is determined as a power compensation parameter for power compensation of the second power supply arm.

4. The method according to claim 1, wherein The first power parameter includes: a first power of the first power supply arm; the second power parameter includes: a second power of the second power supply arm; The determining, based on the first power parameter and the second power parameter, a power compensation parameter for performing power compensation on the first power supply arm and the second power supply arm includes: determining a first active compensation power; When the first active compensation power is the active compensation power for the first power supply arm, determine a second power difference between the first active compensation power and the first power; and determine a second active compensation power based on the second power difference, the second power, and a preset active power threshold; When the first active compensation power is the active compensation power for the second power supply arm, determine a third power difference between the first active compensation power and the second power; and determine a second active compensation power based on the third power difference, the first power, and a preset active power threshold; Based on the first active compensation power and the second active compensation power, power compensation parameters for performing power compensation on the first power supply arm and the second power supply arm are determined.

5. The method according to claim 1, characterized in that The power compensation system further includes: an energy storage device; the converter includes: a first single-phase converter and a second single-phase converter connected in cascade, the first single-phase converter and the second single-phase converter both including a power conversion unit; one end of the power conversion unit of the first single-phase converter is connected to the traction transformer through the first power supply arm of the traction transformer; one end of the power conversion unit of the second single-phase converter is connected to the traction transformer through the second power supply arm of the traction transformer; the other ends of the power conversion units of the first single-phase converter and the second single-phase converter are respectively connected to the energy storage device; The performing power compensation on the first power supply arm and the second power supply arm respectively based on the power compensation parameter and the converter includes: When the power compensation parameter is a first reactive compensation power for power compensation of the first power supply arm, a power conversion unit based on the first single-phase converter performs power conversion on the first reactive compensation power provided by the energy storage device, and transmits the first reactive compensation power after power conversion to the first power supply arm to perform reactive compensation on the first power supply arm; When the power compensation parameter is the second reactive compensation power for power compensation of the second power supply arm, the power conversion unit based on the second single-phase converter performs power conversion on the second reactive compensation power provided by the energy storage device, and transmits the second reactive compensation power after power conversion to the second power supply arm to perform reactive compensation on the second power supply arm.

6. The method according to claim 1, wherein The power compensation system further includes: an energy storage device; The performing power compensation on the first power supply arm and the second power supply arm respectively based on the power compensation parameter and the converter includes: When the power compensation parameter is a first active compensation power for performing power compensation on the first power supply arm, controlling the energy storage device to output the first active compensation power to the converter, so as to perform active compensation on the first power supply arm based on the first active compensation power through the converter; When the power compensation parameter is the second active compensation power for power compensation of the second power supply arm, the energy storage device is controlled to output the second active compensation power to the converter, so as to perform active compensation on the second power supply arm based on the second active compensation power through the converter.

7. The method according to claim 1, characterized in that The power compensation system further includes: an energy storage device; before performing power compensation on the first power supply arm and the second power supply arm based on the power compensation parameter and the converter, the method further includes: determining a charge and discharge time of the energy storage device; The capacity of the energy storage device is determined based on the charge and discharge time, the rated power of the energy storage device, and the negative sequence voltage imbalance.

8. A power grid power compensation device, characterized in that: include: an acquisition module, configured to acquire a first power parameter of the first power supply arm and a second power parameter of the second power supply arm; a determination module configured to determine, based on the first power parameter and the second power parameter, a power compensation parameter for performing power compensation on the first power supply arm and the second power supply arm when it is determined that a power adjustment condition is satisfied based on the first power parameter and the second power parameter; A power compensation module is used to perform power compensation on the first power supply arm and the second power supply arm respectively based on the power compensation parameter and the converter.

9. A computer-readable storage medium, characterized in that: The computer-readable storage medium includes a stored program, wherein the program executes the method described in any one of claims 1 to 7 when executed.

10. An electronic device comprising a memory and a processor, characterized in that: A computer program is stored in the memory, and the processor is configured to execute the method according to any one of claims 1 to 7 through the computer program.

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