Study On The Control Method Of Shunt Hybrid Active Power Filter

As known to all, Because of the rapid development of industry in constant, universal power electronic devices are also very fast, making the formation of power electronic devices harmonic current into the grid, which spread to the electrical equipment to inefficiency, and the power supply, the harmonic Wave is not of high quality lead to a very big reason. Harmonic pollution more effective solution is to use the source filter (APF), now its popularity at380V low voltage systems. Due to many factors, so it can not spread with the high-pressure system. Active filter and passive filter in series parallel hybrid active filter has the advantages of both of them, such as making the cost is not high, excellent performance, making the APF is more practical. It can not only compensate harmonics very good, but also carried out a number of fundamental reactive power compensation, so the parallel development of hybrid active filter can be described as brilliant and popularity will be higher. The difficulties in engineering application, discusses its DC side voltage control, current tracking control problem are focused on for the shunt hybrid active power filter (SHAPF) in the paper.According to the structure characteristics of shunt hybrid active power filter, a new combined control method based on Lyapunov theory is put forward in this paper. First the topology structure of shunt hybrid active power filter is given. Through the electrical model of parallel hybrid active power filter, the filtering principle is analyzed. And4kinds of control strategies analyzed. The harmonic current extraction algorithm is researched, which contains the harmonic current from the feedforward control, feedback control and DC voltage control respectively. The harmonic current is the whole instruction current, which is the input signal for the control method proposed in this paper. The system has global stability with the proposed new combined control method based on Lyapunov theory is verified. Through simulation and experiments concluded, indicating that for harmonic compensation and suppression, the proposed control method is more advantageous.