Control method, device and apparatus for hybrid reactive compensation device

Abstract

The present application discloses a control method and apparatus for a hybrid reactive compensation device. The method includes the steps of: uploading the three-phase voltage instantaneous value andthe three-phase current instantaneous value of a load bus of the compensation device, and a grid operating frequency to a host computer of the compensation device; inputting the capacitance value of acapacitor into the host computer of the compensation device, and setting the number of switched-in TSC switching capacitor of a hybrid reactive compensator and the output reactive power of a SVG based on the set reactive power or power factor, to obtain a calculation result; issuing control instructions to a slave computer of the TSC controller of the compensation device and the slave computer ofthe SVG controller based on the calculation result. The method can accurately compensate the hybrid reactive compensation device by the host computer, and the host computer can optimize the calculation by outputting the reactive power and the 0.9-1 power factor range condition allowed by a grid system, thereby obtaining the optimal accurate reactive compensation value of the reactive compensationdevice.

Description

technical field [0001] The present application belongs to the technical field of electric power system power supply, and in particular relates to a control method, device and equipment for a hybrid reactive power compensation device. Background technique [0002] Resistive and inductive loads are ubiquitous in the power system, which directly leads to low power factor of the system, which will increase the voltage loss of the transmission line and reduce the transmission efficiency of the system. Existing solutions that allow the system to operate at unity power factor can be divided into the following three categories: [0003] 1. Passive reactive power compensation scheme (TSC): This method uses inductors, capacitors, and switching switches to form a branch circuit connected in parallel under the load voltage bus, and directly uses the inductor and capacitor to absorb and send out reactive power to the load. This method has large compensation capacity, high withstand volt...

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Problems solved by technology

[0003] 1. Passive reactive power compensation scheme (TSC): This method uses inductors, capacitors, and switching switches to form a branch circuit connected in parallel under the load voltage bus, and directly uses the inductor and capacitor to absorb and send out reactive power to the load. This method has large compensation capacity, high withstand voltage, high reliability, and can dynamically adjust reactive power output; however, the dynamic adjustment speed is slow, and only gear switching can not be accurately adjusted reactive power output, and ultimately cannot be realized full compensation

[0004]2. Active reactive power compensation scheme (SVG): This method connects the power electronic converter device in parallel on the load voltage bus, and through the reactive power of the load current on the grid side The component tracking control can make the system run under the unit power factor, and the dynamic adjustment speed is fast; but the disadvantage is that the control circuit is complicated, the reliability is low, and the capacity, withstand voltage, and current rating are limited by the switching device. The current converter and the voltage bus side are matched with appropriate inductance and capacitance to reduce the voltage and capacity level of the converter device, but the current resistance capacity of the whole device is still limited

[0007]Therefore, there are two defects in the existing technology: (1) The main goal is full compensation, which cannot be compensated accurately, or can only fully compensate the system ; (2) The reactive power increases significantly, and the reactive power is compensated by the static var generator before the capacitor switching device reaches a steady state.

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