An energy-feedback flexible power supply coordinated control system and control method

Abstract

The invention discloses an energy-feedback type flexible power supply coordination control system and a control method, including a front-stage three-phase PWM rectifier electrically connected to the power supply system on the AC side and a rear-stage unidirectional inverter electrically connected to the distribution network system on the AC side device, the DC side of the front stage three-phase PWM rectifier is interconnected with the DC side of the rear stage unidirectional inverter through a DC bus; it also includes a coordinate transformation unit, a power calculation unit, a first feedforward branch, and a front stage drive pulse A generating unit, a second feedforward branch and a subsequent driving pulse generating unit. Improve the rapidity of ground fault arc suppression through the AC voltage feedforward branch of the rear stage; through the active power feedforward branch between the front and rear stages, solve the problem of large fluctuations in the DC bus voltage at the moment the flexible power supply starts, and improve the response speed and operational reliability of the flexible power supply , which is simple to implement.

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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