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Research and Design of Reactive Power Compensator for the Impact Load

Author: ShiXiaoHan
Tutor: ZhaoJianGuo
School: Shandong University
Course: Proceedings of the
Keywords: Impact load Dynamic reactive power compensation A TSC type of reactive power compensation device DSP controller Instantaneous reactive power theory Zero switching
CLC: TM761
Type: Master's thesis
Year: 2011
Downloads: 86
Quote: 0
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Abstract


Due to the impact load nonlinearity and power electronic converter in the control system, will lead to the reduction of the power factor of the distribution network, a large number of harmonics injected to the grid. The presence of harmonics will cause the vibration of the motor and fever, symptoms, reducing its working efficiency and service life. Impact load can also cause the grid voltage and frequency fluctuations, which may in turn lead to malfunction of the relay, reduce the reliability of power supply. Reactive power compensation and harmonic suppression technology as a primary means of governance of the problem, and have good results in practical engineering. The reactive shock for shock load, the development of fast and accurate tracking characteristics of reactive power compensation device, with a larger value. On the basis of literature, the paper summarizes the impact load characteristics and hazards. For reactive power compensation device for impact load, compensation accuracy and fast action of these two major issues, from the detection algorithm, control strategies and hardware implementation aspects of the research, comparative analysis to determine the engineering TSC type compensation scheme in place. TSC reactive power compensation device on the basis of theoretical analysis for the impact load to carry out the design, the focus is to consider the impact load control system design. Based on instantaneous reactive power theory in the design of the control system the harmonic environment without the power detection accuracy and fast at the same time with a voltage correction reactive power control method, control can ensure the fast, but also improves control The stability of the system. By isovolumic cycle of the capacitor bank switching, can effectively extend the life of the compensation device, and, based on the means of control of the thyristor electronic switches, capacitor bank can be realized without impact, no flow accurately controllable switching. The simulation results demonstrate the effectiveness of the design. Finally, prototype development and testing of the control system. In the prototype design, using a 32-bit fixed-point high-speed digital signal processor chip the DSP2812 as core controller, fast data acquisition calculation and control command signal generation. Also, design and development with the controller signal preprocessing circuit, the frequency tracking circuit and the control signal driver circuit isolation. Embedded C language as the main software programming, graphical display of mixed assembly language and C language programming, can take into account the speed and readability; CCS debugging environment to facilitate the implementation of the program of monitoring and data information. Complete test platform design, build and test program and test the performance of the control system prototype. The test results show that in the possible impact load range, the compensating device prototype control system can correct action, the response time is less than two power frequency cycles, and can effectively achieve the fast tracking of the impact load compensation.

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CLC: > Industrial Technology > Electrotechnical > Transmission and distribution engineering, power network and power system > Power system automation > Automatically adjusts
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