Study Of The Reactive Power Compensation Automatic Controller

The reactive power compensation is an important project in the power system. This project designs reactive power automatic controller which casts or cuts off parallel capacitors in order to achieve reactive power compensation, ensuring qualified power factor.Some tests are carried to solve automatic controllers' defects. For example, we improve on software, overcome controllers' defects, advance compensation accuracy and velocity, and realize cycle run.The principle of the design is that we judge by both power factor and voltage to cast or cut capacitors. When voltage is in the quality limit, we raise power factor and degrade electric power loss. When voltage is beyond assigned voltage, we cut off capacitors that are working.CS5460A is the core chip in the design. It examines some parameters such as voltage, current, active power relating to power factor. Master control unit calculates power factor, then compares it with power factor lower limit and upper limit, finally make the decision of putting in or cutting off capacitors.The control apparatus can display the condition of voltage, current, power factor and capacitors operation, and have the function of warning and bottoming. Moreover users can set some parameters such as power factor upper limit, lower limit and so on. In this system, we use RS-485 bus standard realizing serial data communications of PC and single-chip computer. The PC can monitor the condition of power factor, voltage and so on.