民用諧波源負荷的諧波測量與隨機性分析
[Abstract]:With the widespread use of non-linear household appliances, the harmonic generated by household load is becoming more and more harmful to the power grid, and their harmonic emission level can not be ignored. The load is widely distributed in our country. If the monitoring equipment is used to evaluate the level of harmonic emission, the cost is undoubtedly huge, and it is not conducive to harmonic control. Therefore, it is necessary to establish a model which can effectively evaluate the load of civil harmonic source. At present, the quantitative research on civil harmonic source load is relatively few, and the influence of power supply voltage on harmonic emission level is not taken into account. The influence degree of system voltage on the combination of single harmonic source and specific harmonic source is clear, and the correlation model does not take into account the influence of power supply voltage on harmonic emission level. However, for the civil load composed of various household appliances, the influence of the system voltage on each harmonic current is difficult to be determined theoretically, so the paper starts from the measured data. Based on the analysis of the law of harmonic variation and the influence of system voltage on the harmonic current, a bottom-to-top harmonic evaluation model with single household appliance as the basic unit is established according to the characteristics of the harmonic source load. The main contents of this paper are as follows: (1) sampling and analyzing the working current of the common civil harmonic source load, it is found that the harmonic current is mainly 3,5,7 times, and the higher the harmonic number is, the lower the amplitude of the harmonic current is; There is little difference in phase distribution among the harmonics. Combined with the frequency domain model analysis of the main harmonic sources, the harmonic characteristics of household appliances are related to their own structure and parameters, and are affected by the system voltage at the same time. In the actual distribution network, the power supply voltage will reduce the harmonic emission level of the nonlinear household appliances, and have different effects on the harmonic effect of different times, and the harmonic phase will also be influenced by the power supply voltage, and the harmonic emission level of the nonlinear household appliances will be reduced. (2) the voltage and current of single household, single unit, low-voltage side and high-voltage side of power supply transformer are sampled continuously for many days, and the variation rule of power, amplitude and phase of each harmonic current is analyzed. It is found that not all loads contribute to the harmonic current in the system, the nonlinear load is the main harmonic source, and the linear load has little effect on the household harmonic emission. The linear correlation between harmonics and power is different, three times are the highest, five times are the lowest, seven times show negative linear correlation. The third harmonic phase is stable, the 5th and 7th harmonic phase is sensitive to the system voltage, the voltage distortion rate has a greater effect on the fifth harmonic change, and the voltage amplitude has a greater influence on the seventh harmonic change. (3) according to the harmonic characteristics of civil load obtained from the measured data, a harmonic evaluation model of civil load based on non-linear household appliances is established. The use of most household appliances is closely related to the residents' living habits, so the probability of using household appliances can be obtained by using the relevant statistical data of "time use", and the switching state of the residents' harmonic source load can be determined by Monte Carlo simulation. Combined with the harmonic current source model of household appliances and the correction coefficient of each harmonic current, the harmonic emission level of a single household is calculated, and the correction coefficient of the fifth harmonic current is determined by the distortion rate of the power supply voltage. The correction coefficient of the seventh harmonic current is determined by the supply voltage amplitude voltage. Finally, the lumped harmonic emission level of the civil harmonic source load is determined by adding up the harmonic currents of other households at the moment.
【學(xué)位授予單位】:山東大學(xué)
【學(xué)位級別】:碩士
【學(xué)位授予年份】:2017
【分類號】:TM711;TM935
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