Reactive power compensation for Reactive power compensation, referred to as reactive power compensation in power supply system plays a role in improving power factor and reduce the loss of power transformers and transmission lines, improve efficiency, improve power environment. Reactive power compensation device in electric power supply system in a very important position of indispensable. Reasonable compensation device, can be done to minimize power loss and improve grid quality. Conversely, such as select or improper use may result in power supply, voltage fluctuations, harmonic increases, and many other factors.