Characteristic Analysis Of SHAPF And STATCOM Parallel System

With the development of national economy and the improvement of people's living standards, power electronic devices and nonlinear loads are widely used in industrial control field. The user's requirements on power quality become higher and higher, the most outstanding ones of which are the power system harmonics and system voltage fluctuation. Harmonic pollution is mainly caused by the nonlinear load, while the system voltage fluctuation is mainly due to the imbalance between system and load on the reactive power. Therefore, how to make effectively combine compensation for the harmonic and dynamic reactive power has become one of the urgent problems to be solved in power transmission and distribution technology. Through access to related literatures in dynamic active compensation techniques of harmonics and reactive power, a harmonic and reactive power compensation system based on Shunt Hybrid Active Power Filter and Static Synchronous Compensator is presented in this paper. On the basis of respectively studying on the operation principle and parallel strategy of the SHAPF and STATCOM, the shunt system composed of the SHAPF and STATCOM is analyzed and some improvement measures are proposed according to the performance defects. Finally, simulation models are built by using MATLAB to verify the correctness of the theory.The main research work of this paper as follows:1. Analyzed the circuit topology and working principle of SHAPF and STATCOM, and analyzed their control strategies and the selection methods of key parameters according to its control characteristics.2. Analyzed the characteristics of harmonics and reactive power combine compensation system based on SHAPF and STATCOM and proposed some improvement measures. A variable capacity control method was presented according to the insufficient output capacity of SHAPF when the load changed. A fuzzy PI control was suggested for the adaptability of PI parameters according to the difficult choice of PI parameters because of the non-linear inverter in STATCOM.3. Builtimulation models by using MATLAB and respectively verified the harmonic suppression characteristics of SHAPF, the reactive power compensation characteristics of STATCOM and the control features of combine compensation system for harmonics and reactive power.