| High power supply quality, which is characterized by higher reliability and higher dynamic quality, is demanded in the information age. Custom Power technology, which is a new area of research in power system, will be an effective way to improve the power quality of distribution network in the future. Distribution Static Synchronous Compensator (DSTATCOM), which can replace conventional voltage and reactive power control device and is more powerful and fast, is an important Custom Power device. Based on the development of the DSTATCOM experimental platform, control strategy, detection and control methods and key technology for reactive power compensation and negative sequence current compensation were studied.With the single-phase equivalent circuit of DSTATCOM, the basic tenet of reactive power compensation was expounded first of all. In order to achieve the objectives of reactive power compensation and negative sequence current compensation, the dividing-sequence control method was proposed. In such method, the aim of reactive power compensation was achieved in positive sequence control loop, while the objective of negative sequence current compensation was achieved in negative sequence control loop. Compensation signals were obtained by positive sequence and negative sequence dq transformations.To verify the validly of the proposed control method, the DSTATCOM simulation model based on MATLAB6.5 was built. Simulation results show that the DSTATCOM based on the proposed control method can achieve the objectives of reactive power compensation and negative sequence current compensation.Based on the above theory and technology, a±50kvar DSTATCOM experimental platform based on DSP (TMS320LF2407A) controller was developed. Software and hardware design of the DSTATCOM was expatiated in the paper. Related experiments were implemented on the DSTATCOM experimental platform. The effective of the theories were verified by the experimental results.
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