Electric energy quality flexible control device and method

Abstract

The invention provides an electric energy quality flexible control device and method. The device comprises a dynamic voltage recovery module and an active power filtering module. The active power filtering module is connected with an external power grid; the dynamic voltage recovery module comprises a first converter, a first energy storage unit and a bidirectional thyristor T1, the bidirectionalthyristor T1 is connected between the external power grid and a load, the first energy storage unit is connected with the load through the first converter, and the electric energy quality flexible control device is high in applicability, small in loss and simple in electric energy quality control process. According to the technical scheme provided by the invention, the emergency power supply module is arranged to deal with emergencies, the application range is wide, the loss is low, and the working stability of the device is improved; the electric energy quality control device provided by theinvention is combined with other rapid controllable devices for use, even if the parameters of the electric energy quality control device are not matched with those of the other rapid controllable devices, oscillation cannot be induced, and the other rapid controllable devices are prevented from being damaged.

Description

technical field [0001] The invention relates to the technical field of power quality control, in particular to a flexible power quality control device and method. Background technique [0002] With the vigorous development of social production and industrial technology, various novel technologies and new facilities and equipment have been applied to the power system, which has brought new development space for the technological progress of the power system, but at the same time, it has also caused some problems for the stable operation of the power grid. negative influence. For example, the emergence of a large number of nonlinear loads such as electric arc furnaces brings a lot of harmonic pollution to the power system; short-circuit faults and various impact loads cause voltage sags on the system side. In addition, sensitive loads such as medical equipment, chemical industry, and high-precision instruments have increasingly stringent requirements for power quality. If the...

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Problems solved by technology

[0004] In order to overcome the poor applicability, large loss, complex power quality control process and easy oscillation in the above-mentioned prior art, the present invention provides a flexible power quality control device and method, including a dynamic voltage recovery module and an active power filter module; The source power filtering module is connected to the external power grid; the dynamic voltage recovery module includes a first converter, a first energy storage unit and a bidirectional thyristor T1, and the bidirectional thyristor T1 is connected between the external power grid and the load, and the first energy storage unit passes through The first converter is connected to the load, the power quality flexible control device has strong applicability, low loss, simple power quality control process, and is not easy to oscillate

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