民用机场供电系统谐波电流治理和无功功率补偿方案研究
发布时间：2018-12-16 19:08
【摘要】：良好的电能质量是保证民航机场电力设施和用电设备安全、可靠运行的基础。伴随机场规模的扩大和数量的增加,减少机场电能损耗,对机场采取必要的节能减排措施已势在必行,机场的谐波治理及无功补偿是保证电能质量和节能减排的关键。首先介绍了谐波和无功功率的基础理论,分析了机场三大类供电系统:阻感负载整流电路、带滤波电容整流电路和交流调压电路的特点,建立了谐波模型分析了功率因数。其次,在结合机场供电系统谐波特点的基础上,选择了自适应的谐波检测算法经验模式分解(EMD),针对其在谐波检测过程中易产生模态混叠影响精度的问题,提出一种频率约束的经验模态分解算法,通过对固有模态函数中零点分布加以频率约束并重新设计固有模态函数的筛分准则,减小了模态混叠的概率,还实现了电网中特定次谐波的检测。将本文方法与传统EMD法、p-q法进行谐波检测仿真和实测数据实验,本文方法能够克服传统经验模式分解中存在的模态混叠问题,与p-q法相比,在检测精度以及基波电流相位的一致性方面都优于p-q法,能实现电网谐波检测且具有很好的精度。最后,在SIMULINK环境下搭建了三相5H桥级联的SVG仿真环境,选取了控制策略,分析了变流性负载在无功补偿系统的静态响应和动态响应特性,分别对阻感性负载在三相平衡和不平衡对电网做了补偿实验,补偿后电网的电能质量明显提高。
[Abstract]:Good power quality is the basis to ensure the safe and reliable operation of civil aviation airport power facilities and equipment. With the expansion of the airport scale and the increase of the number, it is imperative to take necessary energy saving and emission reduction measures to reduce the power loss of the airport. The harmonic control and reactive power compensation of the airport is the key to ensure the power quality and energy saving and emission reduction. Firstly, the basic theory of harmonic and reactive power is introduced, and the characteristics of three kinds of power supply system in airport are analyzed: resistive load rectifier circuit, rectifier circuit with filter capacitor and AC voltage regulating circuit, and the harmonic model is established to analyze the power factor. Secondly, based on the harmonic characteristics of the power supply system in the airport, the empirical mode decomposition (EMD),) algorithm of adaptive harmonic detection is selected to solve the problem that modal aliasing is easy to affect the accuracy of harmonic detection. An empirical mode decomposition algorithm with frequency constraints is proposed. The probability of modal aliasing is reduced by applying frequency constraints to the distribution of zero points in the inherent mode function and redesigning the screening criterion of the inherent mode function. The detection of specific subharmonics in power grid is also realized. Compared with the traditional EMD method and p-q method, the proposed method can overcome the modal aliasing problem in the traditional empirical mode decomposition, compared with the p-q method. It is superior to p-q method in detecting accuracy and consistency of fundamental current phase. It can realize harmonic detection and has good accuracy. Finally, the SVG simulation environment of three-phase 5H bridge cascade is built in SIMULINK environment, and the control strategy is selected. The static and dynamic response characteristics of variable current load in reactive power compensation system are analyzed. The compensation experiments of resistive load in three-phase balance and unbalance are carried out respectively, and the power quality of the power network is obviously improved after compensation.
【学位授予单位】：中国民航大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：V351.31
[Abstract]:Good power quality is the basis to ensure the safe and reliable operation of civil aviation airport power facilities and equipment. With the expansion of the airport scale and the increase of the number, it is imperative to take necessary energy saving and emission reduction measures to reduce the power loss of the airport. The harmonic control and reactive power compensation of the airport is the key to ensure the power quality and energy saving and emission reduction. Firstly, the basic theory of harmonic and reactive power is introduced, and the characteristics of three kinds of power supply system in airport are analyzed: resistive load rectifier circuit, rectifier circuit with filter capacitor and AC voltage regulating circuit, and the harmonic model is established to analyze the power factor. Secondly, based on the harmonic characteristics of the power supply system in the airport, the empirical mode decomposition (EMD),) algorithm of adaptive harmonic detection is selected to solve the problem that modal aliasing is easy to affect the accuracy of harmonic detection. An empirical mode decomposition algorithm with frequency constraints is proposed. The probability of modal aliasing is reduced by applying frequency constraints to the distribution of zero points in the inherent mode function and redesigning the screening criterion of the inherent mode function. The detection of specific subharmonics in power grid is also realized. Compared with the traditional EMD method and p-q method, the proposed method can overcome the modal aliasing problem in the traditional empirical mode decomposition, compared with the p-q method. It is superior to p-q method in detecting accuracy and consistency of fundamental current phase. It can realize harmonic detection and has good accuracy. Finally, the SVG simulation environment of three-phase 5H bridge cascade is built in SIMULINK environment, and the control strategy is selected. The static and dynamic response characteristics of variable current load in reactive power compensation system are analyzed. The compensation experiments of resistive load in three-phase balance and unbalance are carried out respectively, and the power quality of the power network is obviously improved after compensation.
【学位授予单位】：中国民航大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：V351.31
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