谐波源参数的研究
发布时间：2018-09-01 19:09
【摘要】：随着电力电子技术的飞速发展和社会对节能的关注,电力系统中以桥式整流电路为电源的非线性负荷应用日益增多。这些负荷在低压电网中广泛而随机地分布,导致谐波问题日益严重,影响电网的安全运行并引起电能质量下降。为了减少谐波污染,改善电气环境,对于数量庞大的非线性负荷,研究其谐波源污染责任的衡量指标并建立适当的模型来研究谐波源参数,是完善奖惩机制、制定谐波抑制策略、估计谐波发射水平的重要条件。首先,在现有谐波污染责任指标尚难以满足谐波管理奖惩机制执行的分析基础上,提出了用被关注供电支路在PCC点处等效特定次谐波源的视在功率相对于该供电支路传输的基波视在功率的比值Ssi,h* = Ssi,h / Ssi,l=Zsi,h*Isi,h2/Ssi,l 作为衡量污染强度的指标。这一指标表明谐波源对配网的危害主要取决于谐波电流发射强度和谐波阻抗,同时也真实地、定量地反映了谐波源对PCC点的谐波污染能力,有益于奖惩的量化实施、执行,有利于指导谐波的补偿,既适用于复杂网络的等值谐波源,也适用于单个非线性用电设备谐波源。其次,本文基于诺顿等效电路研究谐波源的参数,提出了一种新的元件模型,即“非线性负荷等效成一个受控电流源和等效阻抗的并联”,采用“波动量法”探寻了元件模型参数的影响因素。多种条件下的仿真实验结果表明,系统在特定情况(触发角恒定)下可用诺顿电路等效,非线性元件等效谐波源是一个受控源,同时还会受到阻抗角的影响。推而广之,在特定状态下,不管是非线性元件还是含多个非线性元件的负荷群,或说是一个等效单端口网络,均可以用“诺顿等效电路”或者“戴维南等效电路”来描述。最后,本文从数学理论的角度指出“非干预式”测量方法不适用于估计谐波源参数,并举例进行说明。
[Abstract]:With the rapid development of power electronics technology and the attention of the society to energy saving, the nonlinear load application of bridge rectifier circuit in power system is increasing day by day. These loads are widely and randomly distributed in the low-voltage power network, which leads to the problem of harmonics becoming more and more serious, which affects the safe operation of the power network and causes the decline of the power quality. In order to reduce harmonic pollution and improve electrical environment, for a large number of nonlinear loads, it is necessary to study the measurement index of harmonic source pollution responsibility and establish appropriate model to study harmonic source parameters, which is to perfect the reward and punishment mechanism. Make harmonic suppression strategy and estimate the important condition of harmonic emission level. First of all, on the basis of the analysis that the existing harmonic pollution liability index is still difficult to meet the harmonic management reward and punishment mechanism, The ratio Ssi,h* = Ssi,h / Ssi,l=Zsi,h*Isi,h2/Ssi,l of the apparent power relative to the fundamental wave apparent power transmitted by the concerned power supply branch at the PCC point equivalent to that of the specific sub-harmonic source is proposed as an index to measure the pollution intensity. This index indicates that the harm of harmonic source to distribution network mainly depends on the harmonic current emission intensity and harmonic impedance. At the same time, it reflects the harmonic pollution ability of harmonic source to PCC points, and is beneficial to the quantitative implementation and execution of rewards and punishments. It is beneficial to direct harmonic compensation, which is suitable for both the equivalent harmonic source of complex network and the harmonic source of single nonlinear electrical equipment. Secondly, based on the Norton equivalent circuit to study the parameters of harmonic source, a new component model is proposed, that is, "nonlinear load is equivalent to a controlled current source and equivalent impedance in parallel". The influence factors of the component model parameters are explored by the fluctuation method. The simulation results under various conditions show that the system can be equivalent to Norton circuit under certain conditions (constant trigger angle), and the equivalent harmonic source of nonlinear elements is a controlled source, which is also affected by impedance angle. By extension, in a given state, whether a nonlinear element or a load group containing multiple nonlinear elements, or an equivalent single-port network, can be described as a "Norton equivalent circuit" or "Davinan equivalent circuit". Finally, from the point of view of mathematical theory, this paper points out that the "non-intervention" measurement method is not suitable for estimating harmonic source parameters, and an example is given to illustrate this method.
【学位授予单位】：中国矿业大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TM711
[Abstract]:With the rapid development of power electronics technology and the attention of the society to energy saving, the nonlinear load application of bridge rectifier circuit in power system is increasing day by day. These loads are widely and randomly distributed in the low-voltage power network, which leads to the problem of harmonics becoming more and more serious, which affects the safe operation of the power network and causes the decline of the power quality. In order to reduce harmonic pollution and improve electrical environment, for a large number of nonlinear loads, it is necessary to study the measurement index of harmonic source pollution responsibility and establish appropriate model to study harmonic source parameters, which is to perfect the reward and punishment mechanism. Make harmonic suppression strategy and estimate the important condition of harmonic emission level. First of all, on the basis of the analysis that the existing harmonic pollution liability index is still difficult to meet the harmonic management reward and punishment mechanism, The ratio Ssi,h* = Ssi,h / Ssi,l=Zsi,h*Isi,h2/Ssi,l of the apparent power relative to the fundamental wave apparent power transmitted by the concerned power supply branch at the PCC point equivalent to that of the specific sub-harmonic source is proposed as an index to measure the pollution intensity. This index indicates that the harm of harmonic source to distribution network mainly depends on the harmonic current emission intensity and harmonic impedance. At the same time, it reflects the harmonic pollution ability of harmonic source to PCC points, and is beneficial to the quantitative implementation and execution of rewards and punishments. It is beneficial to direct harmonic compensation, which is suitable for both the equivalent harmonic source of complex network and the harmonic source of single nonlinear electrical equipment. Secondly, based on the Norton equivalent circuit to study the parameters of harmonic source, a new component model is proposed, that is, "nonlinear load is equivalent to a controlled current source and equivalent impedance in parallel". The influence factors of the component model parameters are explored by the fluctuation method. The simulation results under various conditions show that the system can be equivalent to Norton circuit under certain conditions (constant trigger angle), and the equivalent harmonic source of nonlinear elements is a controlled source, which is also affected by impedance angle. By extension, in a given state, whether a nonlinear element or a load group containing multiple nonlinear elements, or an equivalent single-port network, can be described as a "Norton equivalent circuit" or "Davinan equivalent circuit". Finally, from the point of view of mathematical theory, this paper points out that the "non-intervention" measurement method is not suitable for estimating harmonic source parameters, and an example is given to illustrate this method.
【学位授予单位】：中国矿业大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TM711
【参考文献】
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