Research Of Controller Of Low-voltage Dynamic Reactive Power Compensation Based On FPGA

With the rapid development of modern industrial and the rapid progress of powerelectronics technology, more and more nonlinear inductive electrical loads are applied inindustrial fields. That inductive electrical loads can absorb a considerable amount ofreactive power will result in the decreasing of power factor of the electricity load, a largenumber of harmonics, voltage fluctuations, voltage flicker and the three-phase imbalance.Obviously, Based on the above grid problems, it is possible to install the reactive powercompensation equipment near the inductive loads of the low-voltage power grid,providing reactive power to inductive electrical loads instead of electrical grids. With theaccelerated process of modernization, reactive power compensation is playing a quietlyimportant role in the safe and stable operation of the grid, reducing line losses, improvingpower quality and socio-economic benefits.AS to the reactive power compensation controller, the DSP is widely used as themain chip at home and abroad, and it is better to achieve the purpose of reactive powercompensation. However, in the face of harsh industrial environments、load fluctuations、harmonic interference, a DSP-based controller can not finish reactive compensation fastand stably; Therefore, this paper proposes innovatively the control core of pure hardwarecircuit FPGA-based with auxiliary single chip, verifies its feasibility in theory byMATLAB, and then proves its speed and stability through the industrial fields trials.The main subject of research is the study of the FPGA-based low-voltage dynamicreactive power compensation controller. Firstly the detection circuit will detect the voltageand current parameters of the grid and send the message to the conditioning circuit, thenthe conditioning circuit send it to A/D module through the step-down, filtering andconditioning the signal, and finally the master chip FPGA obtains appropriate messagefrom A/D module. The FPGA will analyze the signal and calculate effective values of thevoltage and current, active power, reactive power, apparent power, power factor and so on.Finally the controller by comparing the calculated value with the set value will use controlstrategy to control the implementation of the device in order to complete the task of thereactive power compensation to achieve the desired goal.