级联型配电变集成化补偿控制方法研究
发布时间：2018-07-24 20:20
【摘要】：传统变电站高压侧无功集中补偿与谐波治理方法接入点电压等级高,结构复杂、成本昂贵;而采用低压用户侧就地补偿,装置安装分散、利用率较低且缺乏有效的协调,控制不当易带来新的电能质量问题。配电变压器集成化静止补偿技术(Distribution Transformer STATCOM,DT-STATCOM)将配电变压器绕组作为电力补偿装置的接入点,降低了补偿装置的耐压要求,兼有集中补偿的效果,但是在装置拓扑结构、接入方式以及控制策略等方面仍有待进一步研究。本文以配电网电能质量综合治理为目标,提出了采用配电变压器高压侧绕组中心抽头集成方式的级联型DT-STATCOM,并对无功、谐波和不平衡补偿控制方法展开深入研究。首先,构建了级联型DT-STATCOM系统结构方案。根据配电网实际情况,采用Dyn型配电变高压绕组中心抽头集成方式、级联H桥拓扑结构和LC输出滤波器构成DT-STATCOM系统。建立了各部分的数学模型,分析了补偿注入电流对变压器绕组电流分布及高低压侧的影响,建立了级联型多电平变流器状态方程,分析了由LC输出滤波器和变压器抽头漏抗组成的紧凑型LCL结构的滤波特性,验证了系统可行性。然后,研究了无功电流补偿、谐波电流补偿及无功谐波综合补偿控制方法。基于瞬时无功理论,对适用于跨端口补偿的无功及谐波电流检测方法开展了研究。提出了一种PI控制与PR控制相结合的谐波与无功综合控制策略。采用载波移相SPWM技术进行指令电流跟踪,分析了其调制原理、数学模型及传输特性。搭建Matlab/Simulink仿真平台,进行仿真实验,验证了上述方法的有效性。最后,针对三相不平衡负载,研究了负序电流补偿控制方法及其与无功电流补偿相结合的综合补偿控制方法。针对不平衡补偿对级联型变流器各相桥臂有功输出的影响,指出了不平衡补偿的有效范围。研究了跨端口的负序电流检测与控制方法和直流电容均压控制方法,并进行了仿真实验,验证了上述方法的有效性。
[Abstract]:Traditional reactive Power compensation and Harmonic treatment method for High Voltage side of Substation access Point has high voltage grade, complex structure and high cost, while local compensation with low voltage user side is used, the installation is dispersed, the utilization ratio is low and there is no effective coordination. Improper control is easy to bring about new power quality problems. The integrated static compensation technology of distribution transformer (Distribution Transformer STATCOMDT-STATCOM takes the winding of distribution transformer as the access point of the power compensation device, which reduces the voltage requirement of the compensator and has the effect of centralized compensation. Access methods and control strategies are still to be further studied. In this paper, a cascade DT-STATCOM-based DT-STATCOM-based control method for reactive power, harmonic and unbalanced compensation is proposed, which adopts the integrated mode of central tap of high-voltage side windings of distribution transformers, aiming at the comprehensive control of power quality in distribution networks. Firstly, a cascade DT-STATCOM system architecture is constructed. According to the actual situation of distribution network, the DT-STATCOM system is composed of Dyn type distribution transformer high-voltage winding center tap integration mode, cascaded H-bridge topology structure and LC output filter. The mathematical model of each part is established, the influence of compensating injection current on the current distribution of transformer winding and the high and low voltage side is analyzed, and the state equation of cascaded multilevel converter is established. The filter characteristics of compact LCL structure composed of LC output filter and transformer tap leakage reactance are analyzed and the feasibility of the system is verified. Then, the reactive current compensation, harmonic current compensation and reactive harmonic comprehensive compensation control methods are studied. Based on instantaneous reactive power theory, reactive and harmonic current detection methods suitable for cross-port compensation are studied. An integrated harmonic and reactive power control strategy based on Pi control and PR control is proposed. The modulation principle, mathematical model and transmission characteristics are analyzed by using carrier phase-shifted SPWM technique to track the command current. The Matlab/Simulink simulation platform is built and the simulation experiments are carried out to verify the effectiveness of the above method. Finally, the negative sequence current compensation control method and the integrated compensation control method combined with reactive current compensation are studied for the three-phase unbalanced load. Aiming at the influence of unbalanced compensation on active power output of each phase bridge arm of cascade converter, the effective range of unbalanced compensation is pointed out. The negative sequence current detection and control method and the DC capacitor voltage sharing control method are studied, and the simulation experiments are carried out to verify the effectiveness of the above methods.
【学位授予单位】：华中科技大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TM63;TM714.3
[Abstract]:Traditional reactive Power compensation and Harmonic treatment method for High Voltage side of Substation access Point has high voltage grade, complex structure and high cost, while local compensation with low voltage user side is used, the installation is dispersed, the utilization ratio is low and there is no effective coordination. Improper control is easy to bring about new power quality problems. The integrated static compensation technology of distribution transformer (Distribution Transformer STATCOMDT-STATCOM takes the winding of distribution transformer as the access point of the power compensation device, which reduces the voltage requirement of the compensator and has the effect of centralized compensation. Access methods and control strategies are still to be further studied. In this paper, a cascade DT-STATCOM-based DT-STATCOM-based control method for reactive power, harmonic and unbalanced compensation is proposed, which adopts the integrated mode of central tap of high-voltage side windings of distribution transformers, aiming at the comprehensive control of power quality in distribution networks. Firstly, a cascade DT-STATCOM system architecture is constructed. According to the actual situation of distribution network, the DT-STATCOM system is composed of Dyn type distribution transformer high-voltage winding center tap integration mode, cascaded H-bridge topology structure and LC output filter. The mathematical model of each part is established, the influence of compensating injection current on the current distribution of transformer winding and the high and low voltage side is analyzed, and the state equation of cascaded multilevel converter is established. The filter characteristics of compact LCL structure composed of LC output filter and transformer tap leakage reactance are analyzed and the feasibility of the system is verified. Then, the reactive current compensation, harmonic current compensation and reactive harmonic comprehensive compensation control methods are studied. Based on instantaneous reactive power theory, reactive and harmonic current detection methods suitable for cross-port compensation are studied. An integrated harmonic and reactive power control strategy based on Pi control and PR control is proposed. The modulation principle, mathematical model and transmission characteristics are analyzed by using carrier phase-shifted SPWM technique to track the command current. The Matlab/Simulink simulation platform is built and the simulation experiments are carried out to verify the effectiveness of the above method. Finally, the negative sequence current compensation control method and the integrated compensation control method combined with reactive current compensation are studied for the three-phase unbalanced load. Aiming at the influence of unbalanced compensation on active power output of each phase bridge arm of cascade converter, the effective range of unbalanced compensation is pointed out. The negative sequence current detection and control method and the DC capacitor voltage sharing control method are studied, and the simulation experiments are carried out to verify the effectiveness of the above methods.
【学位授予单位】：华中科技大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TM63;TM714.3
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