Hybrid compensation filter cabinet

Abstract

The invention discloses a hybrid compensation filter cabinet in the field of reactive power compensation equipment of the power system. The hybrid compensation filter cabinet comprises a cabinet body.A dynamic filter reactive power compensation device and a static filter reactive power compensation device are arranged in the cabinet body; and each of the dynamic filter reactive power compensationdevice and the static filter reactive power compensation device consists of a controller, a change-over switch, a compensation capacitor bank, a fuse and a circuit breaker; and a current transformerand a voltage transformer are arranged between an external three-phase power grid and controllers of the dynamic filter reactive power compensation device and the static filter reactive power compensation device. Active power filters and the filter reactors are connected in series to the compensation capacitor banks of the dynamic filter reactive power compensation device and the static filter reactive power compensation device in sequence. Besides, a CPU processing module is arranged in the controller and includes a clock circuit and an energy storage module. The dynamic filter reactive powercompensation device and the static filter reactive power compensation device are connected in parallel with the external three-phase power grid. Therefore, harmonics in the power grid can be eliminated effectively; and the quality of the power grid is improved.

Description

technical field [0001] The invention relates to the field of reactive power compensation equipment in electric power systems, in particular to a hybrid compensation filter cabinet. Background technique [0002] Most of the load types in the power system are inductive loads, coupled with the widespread use of power electronic equipment by power companies, the power factor of the grid is low. Low power factor reduces equipment utilization, increases power supply investment, damages voltage quality, reduces equipment service life, and greatly increases line loss. In order to improve the energy waste caused by the low power factor of the grid and these unfavorable factors for power supply production, the power factor of the grid must be effectively improved. Obviously, it is unreasonable and usually impossible to provide all these reactive powers by generators and transmit them over long distances. A reasonable way is to generate reactive power where reactive power is needed, ...

AI Technical Summary

Problems solved by technology

The capacitor bank and the line resonate in series, which increases the voltage and current distortion rate on the line, which is very likely to cause equipment damage. In this case, the compensation device cannot be used.

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