Multi-redundant configured voltage source type regulation device and control method thereof

Abstract

The invention discloses a multi-redundant configured voltage source type regulation device. The multi-redundant configured voltage source type regulation device comprises an energy storage unit, a power conversion unit, a filtering isolation unit, a solid-state switch unit and a circuit breaker, wherein the power conversion unit comprises four groups of power semiconductor devices with diodes which are reversely connected in parallel, sources of a first power semiconductor device and a third power semiconductor device are connected with a positive electrode of the energy storage unit, drains of a second power semiconductor device and a fourth power semiconductor device are connected with a negative electrode of the energy storage unit, a first AC output end and a second AC output end are connected with a primary edge of the filtering isolation unit, a secondary edge of the filtering isolation unit is connected with the solid-state switch unit, the circuit breaker is connected in parallel with the solid-state switch unit, one end of the circuit breaker is connected with a power supply side, the other end of the circuit breaker is connected with a load side, the solid-state switch unit comprises the power semiconductor devices. By the device, rapid compensation can be achieved, and the device has high reliability. The invention also discloses a control method of the multi-redundant configured voltage source type regulation device.

Description

technical field [0001] The invention relates to a power electronic converter, in particular to a voltage source type regulating device and a control method of the voltage source type regulating device. Background technique [0002] The voltage source type regulating device is connected in series between the power supply and the load. When normal, the device is in a bypass standby state. When the power supply voltage is abnormal, it can be put into operation immediately, and the compensation voltage is output to maintain the load voltage within the normal range. In the case of abnormal short-term voltage of the power grid, the continuous operation of the load is guaranteed to avoid abnormal power outages. Chinese patent CN103457283B introduces the typical composition and working principle of the device. The voltage source regulator is bypassed by a solid-state switch because the breaking time of the solid-state switch is very short. [0003] The solid-state switch, named by ...

AI Technical Summary

Problems solved by technology

Chinese patent CN103457283B introduces the typical composition and working principle of the device. The voltage source regulator is bypassed by a solid-state switch because the breaking time of the solid-state switch is very short.

[0004] The disadvantages of solid-state switches are: (1) heating: coolers or short-circuit switches are required; (2) no obvious breakpoints; since solid-state switches are mainly composed of power electronic devices such as thyristors, IGBTs, GTRs, MOSFETs, and GTOs, their reliability is not as good as Mechanical circuit breakers are not as good as mechanical circuit breakers in their ability to withstand overcurrent and overvoltage

[0005] Since the device is connected in series between the power grid and the load, its own reliability is very important, and it is difficult to guarantee reliability only by relying on solid-state switches. Chinese patent CN 103457283B also includes mechanical circuit breakers, but the closing speed of mechanical circuit breakers Very slow, when the solid-state switch fails, the mechanical circuit breaker needs tens of milliseconds to close completely, and some sensitive loads will stop working within 5ms, so the speed of the bypass needs to be considered at the same time and reliability issues

Images