Development Of Intelligent Low Voltage Reactive Power Compensation Device

This thesis considers the significance of reactive power compensation and analyses the indispensability and economic benefits of reactive power compensation. The development status of reactive power compensation is briefly introduced. Principles of reactive power compensation are explained. Several primary reactive power compensation solutions are discussed. This thesis proposed an intelligent low voltage reactive compensation control scheme and implemented device for shunt capacitor compensation.An ATT7022A is adopted to detect the power grid operation information to reduce the calculation volume of CPU and enhance the precision of power grid parameter identification. This also simplifies design work of the software. ATMEGA64 is utilized as the main process unit and method combining power factor control and voltage limitation is used as the system working mode. Specific voltage phase is determined to switching shunt capacitor via permanent magnetic vacuum synchronous switch. Thus the surge produced during the traditional capacitor switching method is greatly diminished. Switching strategy is applied to alleviate the resonance via multi-measurement average and specifying switching interval during consecutive capacitor switching. The device can record significant data, such as system operation condition and power grid information, for 150 days at most. It provides diverse protect measures to ensure the stability and reliability. It bears friendly human machine interface and communication interface and is convenient for use.The device has been well tested. The trial shows that the system fulfills the design target. And it can identify the power grid parameters correctly and can switching capacitors according to the parameters.