There are three modes of reactive power capacitor compensation cabinets in the 10kV power system: The reactive power shunt capacitor compensation cabinet (reactive power high voltage capacitor compensation cabinet), the SVC static reactive power capacitor compensation cabinet and the SVG dynamic reactive power capacitor compensation cabinet; of which, the first two are reactive power capacitor passive compensation cabinet, and the latter is reactive power capacitor active compensation cabinet. The SVC uses IGBT for switching on/off of the traditional capacitors and electric reactors, and its basic principle of compensation still is capacitance compensation. However, the SVG is completely different, it is no longer equipped with the traditional capacitors.
1.10kV reactive power shunt capacitor compensation cabinet (the reactive power high voltage capacitor compensation cabinet)
A reactive current which is larger than the grid voltage can be generated by installing the parallel capacitors in the power grid, so it is possible to provide a reactive power for the inductive load, thus reducing the power grid power provided to the inductive load; as to the reactive power delivered by the line, since the flow of the reactive power in the power grid is reduced, the electric energy of loss of the power line and the transformer in transmitting the reactive power can be reduced. The reactive power shunt capacitor compensation cabinet usually requires the addition of a reactor to suppress the inrush current as well as suppress the harmonics. The reactive power shunt capacitor compensation cabinet is suitable for occasions where the variations in the load are stable, the fluctuations in voltage and the changes in harmonic are not large.
The disadvantage of the reactive power shunt capacitor compensation cabinet is that when the load of the power grid keeps changing all the time, the shunt capacitors need to be frequently switched on or off. In the process of the shunt capacitors being switched on or off by the breaker, the operating overvoltage will inevitably occur, which may damage the shunt capacitors and affect the normal operation of the power grid.
22.10kVSVC static VAR reactive power capacitor compensation cabinet
10kVSVC (abbreviation for Static Var Compensator) static var reactive power capacitor compensation cabinet is a kind of dynamic reactive power compensation device, which is rapidly and smoothly controllable. It is used in parallel between controllable dynamic VAR device without any rotating components. It utilizes the controllable reactors and power capacitors (fixed or grouping switch) in a parallel manner. The capacitors can send out the reactive power (capacitive), and the controllable reactors can absorb the reactive power (inductive). By adjusting the reactors, it is possible to smoothly convert the whole device from sending out the reactive power to absorbing the reactive power (or to be proceeded in the reversed order), with a quick response.
3.10kVSVG static VAR reactive power capacitor compensation cabinet
The 10kV SVG (Static Var Generator) static VAR reactive power capacitor compensation cabinet uses the turn-off power electronic device (IGBT) to form a self commutation bridge circuit. Through connecting the reactor to the power grid in a parallel manner, it is possible to properly adjust the amplitude and phase of the output voltage on the AC side of the bridge circuit or directly control the AC side current. The required reactive power is quickly absorbed or sent out to achieve the purpose of fast and dynamic regulation of the reactive power. As a reactive power capacitor compensation cabinet, it can not only track the impact current of the impact load, but also can track and compensate the harmonic current.
The system response time of the 10kV static type SVG reactive power capacitor dynamic compensation cabinet is less than 10 Ms, which can quickly provide reactive current to the power grid system and stabilize the bus voltage. The harmonic characteristics are excellent, the compensation performance is good, and the power factor can be increased to more than 0.95 through compensation. Because of its good compensation characteristics, SVG has not been only widely used in industrial enterprises, but also widely used in the field of new energies such as the wind power generation and the photovoltaic power generation.
DELITER has engaged in the research, development and production of the reactive power high voltage capacitor compensation cabinets for 18 years. It will provide you with a specific solution of reactive power capacitor compensation cabinet and harmonic control, which is exclusively for you!