A voltage source regulator with multiple redundant configurations and its control method

Abstract

The invention discloses a voltage source regulating device with multiple redundant configurations, which includes an energy storage unit, a power conversion unit, a filter isolation unit, a solid-state switch unit and a circuit breaker, wherein the power conversion unit consists of four groups of power converters with anti-parallel diodes Composition of semiconductor devices, the sources of the first and third power semiconductor devices are connected to the positive pole of the energy storage unit, the drains of the second and fourth power semiconductor devices are connected to the negative pole of the energy storage unit, and the first and second AC output terminals are isolated from the filter The primary side of the unit is connected; the secondary side of the filter isolation unit is connected to the solid-state switch unit, and the circuit breaker is connected in parallel to the solid-state switch unit; one end of the circuit breaker is connected to the power supply side, and the other end is connected to the load side; the solid-state switch unit includes power semiconductor devices. This kind of device can not only realize fast compensation, but also have high reliability. The invention also discloses a control method of a voltage source type regulating device with multiple redundant configurations.

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

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