级联型H桥STATCOM直流电压控制研究
发布时间：2018-11-12 11:37
【摘要】：为了提高电力系统的稳定性及可靠性,柔性交流输电系统(Flexible AC Transmission Systems,FACTS)作为一项能有效改善电能质量的新技术,得到飞速发展。静止无功补偿器(The Static Synchronous Compensator, STATCOM)是FACTS装置中的一项新技术。其中,级联型STACOM接口电压高,补偿容量大,具有良好的控制性能和补偿效果,成为FACTS装置的研制热点。该结构的变换器各个H桥电容都是独立的,因此存在充放电不同步造成的直流侧电压不平衡问题。本文主要研究了电压平衡控制策略,开展了以下几个方面的研究工作：(1)针对级联型H桥结构的STATCOM分析了无功补偿的基本原理,并在此基础上建立了无功有功解耦的控制系统；理论分析了级联型H桥电路直流电压不平衡的原因,采用基于电容充放电状态的直流电压平衡控制,实现了各H桥子模块直流电容电压的平衡控制和三相之间各H桥子模块直流电容电压的平衡控制。其中,单相电压平衡控制使装置的每一相内部各H桥子模块的电压都保持平衡；三相电压平衡控制保持装置三相间各H桥子模块电压平衡。该控制策略在正常工况和三相电流不平衡时均能够保持直流电压的稳定。(2)在理论分析的基础上,搭建了MATLAB/SIMULINK仿真系统,给出了在各种条件下的仿真波形,验证了控制策略的正确性。(3)基于Verilog HDL硬件描述语言完成了全部控制模块的程序设计,包括直流电容充放电状态的电压平衡控制和级联STATCO M的无功补偿控制。实验结果验证了直流均压控制策略的可行性和系统的动静态性能。
[Abstract]:In order to improve the stability and reliability of power system, flexible AC transmission system (Flexible AC Transmission Systems,FACTS), as a new technology that can effectively improve power quality, has been developed rapidly. Static Var compensator (The Static Synchronous Compensator, STATCOM) is a new technique in FACTS device. Among them, cascaded STACOM interface has high voltage, large compensation capacity, good control performance and compensation effect, so it has become a hot spot in the development of FACTS device. Each H-bridge capacitance of the converter is independent, so the DC voltage imbalance caused by the non-synchronous charging and discharging exists. In this paper, the voltage balance control strategy is studied, and the following research work is carried out: (1) the basic principle of reactive power compensation is analyzed for cascaded H-bridge STATCOM. On this basis, the reactive power decoupling control system is established. The reason of DC voltage imbalance in cascaded H-bridge circuit is analyzed theoretically, and the DC voltage balance control based on capacitive charge-discharge state is adopted. The balance control of DC capacitor voltage of each H bridge submodule and the balance control of DC capacitor voltage of each H bridge submodule between three phases are realized. The single-phase voltage balance control keeps the voltage balance of each H-bridge module in each phase of the device; the three-phase voltage balance control controls the voltage balance of each H-bridge sub-module between the three phases of the device. The control strategy can maintain the stability of DC voltage under normal condition and unbalanced three-phase current. (2) on the basis of theoretical analysis, the MATLAB/SIMULINK simulation system is built, and the simulation waveform under various conditions is given. The correctness of the control strategy is verified. (3) based on Verilog HDL hardware description language, the program design of all control modules is completed, including voltage balance control of DC capacitor charging and discharging state and reactive power compensation control of cascaded STATCO M. The experimental results verify the feasibility of DC voltage sharing control strategy and the dynamic and static performance of the system.
【学位授予单位】：西南交通大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TM761.12
[Abstract]:In order to improve the stability and reliability of power system, flexible AC transmission system (Flexible AC Transmission Systems,FACTS), as a new technology that can effectively improve power quality, has been developed rapidly. Static Var compensator (The Static Synchronous Compensator, STATCOM) is a new technique in FACTS device. Among them, cascaded STACOM interface has high voltage, large compensation capacity, good control performance and compensation effect, so it has become a hot spot in the development of FACTS device. Each H-bridge capacitance of the converter is independent, so the DC voltage imbalance caused by the non-synchronous charging and discharging exists. In this paper, the voltage balance control strategy is studied, and the following research work is carried out: (1) the basic principle of reactive power compensation is analyzed for cascaded H-bridge STATCOM. On this basis, the reactive power decoupling control system is established. The reason of DC voltage imbalance in cascaded H-bridge circuit is analyzed theoretically, and the DC voltage balance control based on capacitive charge-discharge state is adopted. The balance control of DC capacitor voltage of each H bridge submodule and the balance control of DC capacitor voltage of each H bridge submodule between three phases are realized. The single-phase voltage balance control keeps the voltage balance of each H-bridge module in each phase of the device; the three-phase voltage balance control controls the voltage balance of each H-bridge sub-module between the three phases of the device. The control strategy can maintain the stability of DC voltage under normal condition and unbalanced three-phase current. (2) on the basis of theoretical analysis, the MATLAB/SIMULINK simulation system is built, and the simulation waveform under various conditions is given. The correctness of the control strategy is verified. (3) based on Verilog HDL hardware description language, the program design of all control modules is completed, including voltage balance control of DC capacitor charging and discharging state and reactive power compensation control of cascaded STATCO M. The experimental results verify the feasibility of DC voltage sharing control strategy and the dynamic and static performance of the system.
【学位授予单位】：西南交通大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TM761.12
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