三相四線制低壓配電網(wǎng)諧波和瞬時無功電流檢測方法的改進(jìn)
[Abstract]:With the rapid development of power industry and semiconductor industry, converter equipment has been widely used. At the same time, a large number of nonlinear load increases, voltage distortion harmonic pollution is serious, reactive power consumption and other problems seriously affect the quality of power supply and the safe and stable operation of the power network. The effective suppression of harmonics and the dynamic compensation of reactive power have become an urgent task for electric power workers in China. Three-phase four-wire power supply system is the most important power supply mode in low-voltage distribution network in China, but the most popular reactive power compensation device SVG is not widely used in three-phase four-wire power network. In this paper, the working principle, working characteristics and current control mode of SVG are analyzed, and the main circuit topology of SVG in three-phase four-wire power network is analyzed and compared. The topology which is most suitable for the design of this paper is selected. An important aspect of solving the problem of harmonic pollution is to improve the converter itself into a unit power factor converter. And the main topology circuit of SVG converter adopts the cooperation of multi-heavy technology and PWM technology to reduce harmonic pollution, which is the application of this principle. The high frequency and order harmonics of the converter with such control technology are easily filtered. Low-order harmonics are also easily eliminated. The accuracy of reactive current detection directly restricts the compensation performance of reactive power compensator. This paper mainly analyzes and compares the two kinds of harmonic and reactive current detection methods most commonly used and most quickly in SVG. The power theory basis of these three detection methods is also discussed. Through formula derivation and simulation analysis, it is pointed out that dq detection method can be directly applied to reactive current detection of three-phase four-wire power grid. At this point, the ip-iq detection method and the pq detection method can not exceed the dq detection method, and the zero-sequence current separation link is needed in order to be suitable for three-phase four-wire power network. This paper also analyzes the reactive current detection performance of the above three harmonic and reactive current detection methods in the unbalanced operation of the power network, and draws a conclusion through the simulation analysis that the power grid voltage is unbalanced. Due to the failure of PLL to accurately extract the fundamental voltage of the positive sequence of the power grid, the accuracy of the detected reactive current and the speed of detection are seriously affected. In this paper, an improved method of instantaneous reactive current detection is proposed to overcome the shortcomings of traditional methods. Aiming at the shortcoming that ip-iq method can not be directly applied to three-phase four-wire power grid, a zero-sequence current separation link is proposed. In view of the error caused by PLL to the detection method, the amplitude integrator designed in this paper is used to replace it. Each link is: positive sequence voltage acquisition link, amplitude integrator filter AC component link. Based on the ip-iq method, the improved method is simulated by simulink, and the accuracy and real-time performance of the new method are verified by comparing with the traditional method.
【學(xué)位授予單位】:沈陽農(nóng)業(yè)大學(xué)
【學(xué)位級別】:碩士
【學(xué)位授予年份】:2017
【分類號】:TM930
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