Energy feedback type flexible power supply coordination control system and control method

Abstract

The invention discloses an energy feedback type flexible power supply coordination control system and a control method. The energy feedback type flexible power supply coordination control system comprises a preceding-stage three-phase PWM rectifier whose alternating current side is electrically connected with a power supply system and a backward-stage unidirectional inverter whose alternating current side is electrically connected with a power distribution network system, and the direct current side of the preceding-stage three-phase PWM rectifier and the direct current side of the backward-stage unidirectional inverter are interconnected through a direct current bus. The system further comprises a coordinate transformation unit, a power calculation unit, a first feedforward branch circuit, a preceding-stage driving pulse generation unit, a second feedforward branch circuit and a backward-stage driving pulse generation unit. The rapidity of ground fault arc extinction is improved through a rear-stage alternating-current voltage feedforward branch; through the active power feedforward branch between the front stage and the rear stage, the problem of large fluctuation of DC bus voltage at the moment of starting the flexible power supply is solved, the response speed and operation reliability of the flexible power supply are improved, and implementation is simple.

Description

technical field [0001] The invention relates to an energy-feedback flexible power supply coordination control system and a control method, belonging to the technical field of power electronic equipment application in power systems. Background technique [0002] With the rapid development of the urban distribution network, the power supply lines in the distribution network are increasing and lengthening year by year, and the capacitive current of the system to the ground becomes larger, resulting in a grounding arc when the system is single-phase grounded, which endangers personal safety. [0003] At present, flexible power supply has gradually become a research hotspot in the industry due to its advantages of speed, flexibility and precise arc suppression. [0004] The flexible power supply generally adopts the topological form of three-phase uncontrolled rectification at the front stage, single-phase inverter at the rear stage, or three-phase PWM rectification at the front ...

AI Technical Summary

Problems solved by technology

[0007] The purpose of the present invention is to overcome the deficiencies in the prior art, and provide an energy-feedback flexible power supply coordinated control system and control method, which can solve the problem of large fluctuations in the DC bus voltage while ensuring the rapidity of arc suppression of the flexible power supply, and improve the flexibility of the flexible power supply. Reliability and speed of operation

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