Research On Large Capacity Distribution Static Compensator Based On Multiple Technology

With the development of industry and progress of technology, the power quality ofdistribution network has become increasingly concerned by customers. Traditional reactivepower compensation devices, such as Switched Capacitor, Static VAR Compensator (SVC),etc. have not met the requirements of power loss, response time and accuracy. TheDistribution Static Compensator (DSTATCOM) which is composed of Power electriccircuits is becoming the new trend of reactive power compensation and power qualitycontrol.According to the demand of large capacity customers in distribution network, a novelscheme of DSTATCOM based on multiple technology is proposed by our research team.This scheme consists of a parallel-converter and a series-converter. The Parallel-converteris a multiple inverter. Its output voltage is synchronizing to the grid and the amplitude is assame as the grid’s. The series-converter is an H-bridge PWM Voltage Source Inverter (VSI),using current-tracking algorithm to control the compensate current.The introduction of principle of this novel scheme is made in this article. Theequivalent circuit and control strategy of the DSTATCOM is approached so as to analyzeand design the system’s parametric. MATLAB is used to modeling and simulating theDSTATCOM. The advantage of this scheme in large distribution network is approved bythe simulation results.Under the guidance of the principle, a200kVA/1kV DSTATCOM prototype isdeveloped. The design and debugging of the prototype’s power circuit is made in this article.The control system based on DSP (TMS320F2812) and FPGA (EP1C3T144C8) is designed.The experiment of the parallel-converter and the series-converter is implemented. Theresults show good performance of this prototype.