基于H6拓扑的单相光伏逆变系统谐波抑制研究
发布时间：2019-04-01 11:13
【摘要】：光伏发电是新能源领域中最有前景的能源方式,家庭户用型的中小功率分布式光伏发电是未来的发展趋势。逆变器是光伏发电系统的核心,单相H6桥光伏逆变器具有结构简单,共模漏电流小,电流畸变率小,安全性高等优点,在光伏发电行业中有很好的应用前景。电网电压背景谐波对逆变器输出电流质量影响较大,逆变器输出电流谐波对电网和其他用电设备也有较大的危害,基于H6桥光伏逆变器的电流谐波更加复杂,研究提高H6桥光伏逆变器的电流谐波抑制特性对提高逆变器性能及其电网适应性有重要意义。本课题针对单相H6桥光伏逆变器并网电流谐波抑制问题,提出了电流内环准比例谐振+重复控制,及电压外环附加陷波器控制的谐波抑制方法,最后搭建了一套10k W的H6桥光伏逆变器实验平台,对所提出的控制方法进行了实验,主要研究内容如下:调研并总结了单相非隔离型逆变器的研究现状以及H6桥光伏逆变器谐波抑制技术的研究现状。分析了单相H6拓扑电路结构和工作原理,在此基础上分析了H6桥光伏逆变器的共模漏电流抑制机制,研究了逆变器输出电流谐波的产生原因。建立了H6桥光伏逆变器电压、电流双闭环控制系统的数学模型。针对电网电压多次背景谐波问题,分析了H6桥光伏逆变器传统准比例谐振控制的谐波抑制局限性。在此基础上提出了H6桥光伏逆变器电流内环准比例谐振+重复控制,及电压外环附加陷波器控制的谐波抑制方法。给出了基于频域分析的电流内环准比例谐振+重复控制器和电压外环附加陷波器的电压控制器的参数设计方法,并验证了所设计控制系统的稳定性。搭建了一套10k W的H6桥光伏逆变器实验平台,对所设计的电流内环准比例谐振+重复控制器和电压外环附加陷波器的电压控制器进行实验。实验结果表明在所提出的谐波抑制策略下H6桥光伏逆变器输出电流的THD为2.273%,采用常规准比例谐振控制策略下的逆变器输出电流的THD为2.977%,所提出的电流内环准比例谐振+重复控制,及电压外环附加陷波器控制下的H6桥光伏逆变器的输出电流具有良好的电能质量。
[Abstract]:PV power generation is the most promising energy mode in the new energy field, and the small and medium-sized power distributed photovoltaic power generation in the household is the future development trend. The inverter is the core of the photovoltaic power generation system, and the single-phase H6-bridge photovoltaic inverter has the advantages of simple structure, small common-mode leakage current, small current distortion rate, high safety and the like, and has good application prospect in the photovoltaic power generation industry. The influence of the power grid voltage background harmonic on the output current quality of the inverter is large, the output current harmonic of the inverter also has great harm to the power grid and other electric equipment, and the current harmonic of the H6-bridge photovoltaic inverter is more complex, It is of great significance for improving the performance of the inverter and the adaptability of the power grid by improving the current harmonic rejection characteristic of the H6-bridge photovoltaic inverter. Aiming at the problem of harmonic suppression of grid-connected current of a single-phase H6-bridge photovoltaic inverter, a harmonic suppression method controlled by a current inner-loop quasi-proportional resonance + repetitive control and a voltage outer-loop additional trap is proposed, and a set of 10k-W H6-bridge photovoltaic inverter experimental platform is finally set up, The main contents of the control method are as follows: the research status of the single-phase non-isolated inverter and the research status of the harmonic suppression technology of the H6-bridge photovoltaic inverter are summarized and summarized. The structure and working principle of the single-phase H6 topology are analyzed. On this basis, the common mode leakage current suppression mechanism of the H6-bridge photovoltaic inverter is analyzed, and the cause of the harmonic generation of the output current of the inverter is studied. The mathematical model of the voltage and current double closed-loop control system for H6-bridge photovoltaic inverter is established. The harmonic suppression limitation of the conventional quasi-proportional resonance control of the H6-bridge photovoltaic inverter is analyzed for many times of background harmonic of the grid voltage. On the basis of this, the quasi-proportional resonance + repetitive control of the current inner loop of the H6-bridge photovoltaic inverter and the harmonic suppression method controlled by the additional trap of the voltage outer loop are proposed. The parameter design method of the voltage controller of the current inner loop quasi-proportional resonance + repeat controller and the voltage outer loop additional trap based on the frequency domain analysis is given, and the stability of the designed control system is verified. A set of 10k W 6-bridge photovoltaic inverter experiment platform is set up, and the voltage controller of the designed current inner loop quasi-proportional resonance + repeat controller and the voltage outer loop additional trap is tested. The results show that the THD of the output current of the H6-bridge PV inverter is 2.273% under the proposed harmonic rejection strategy, and the THD of the inverter output current under the conventional quasi-proportional resonance control strategy is 2.977%, and the proposed current inner-loop quasi-proportional resonance + repeat control, And the output current of the H6-bridge photovoltaic inverter under the control of the voltage outer-loop additional trap has good electric energy quality.
【学位授予单位】：深圳大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TM464;TM615
本文编号：2451507
[Abstract]:PV power generation is the most promising energy mode in the new energy field, and the small and medium-sized power distributed photovoltaic power generation in the household is the future development trend. The inverter is the core of the photovoltaic power generation system, and the single-phase H6-bridge photovoltaic inverter has the advantages of simple structure, small common-mode leakage current, small current distortion rate, high safety and the like, and has good application prospect in the photovoltaic power generation industry. The influence of the power grid voltage background harmonic on the output current quality of the inverter is large, the output current harmonic of the inverter also has great harm to the power grid and other electric equipment, and the current harmonic of the H6-bridge photovoltaic inverter is more complex, It is of great significance for improving the performance of the inverter and the adaptability of the power grid by improving the current harmonic rejection characteristic of the H6-bridge photovoltaic inverter. Aiming at the problem of harmonic suppression of grid-connected current of a single-phase H6-bridge photovoltaic inverter, a harmonic suppression method controlled by a current inner-loop quasi-proportional resonance + repetitive control and a voltage outer-loop additional trap is proposed, and a set of 10k-W H6-bridge photovoltaic inverter experimental platform is finally set up, The main contents of the control method are as follows: the research status of the single-phase non-isolated inverter and the research status of the harmonic suppression technology of the H6-bridge photovoltaic inverter are summarized and summarized. The structure and working principle of the single-phase H6 topology are analyzed. On this basis, the common mode leakage current suppression mechanism of the H6-bridge photovoltaic inverter is analyzed, and the cause of the harmonic generation of the output current of the inverter is studied. The mathematical model of the voltage and current double closed-loop control system for H6-bridge photovoltaic inverter is established. The harmonic suppression limitation of the conventional quasi-proportional resonance control of the H6-bridge photovoltaic inverter is analyzed for many times of background harmonic of the grid voltage. On the basis of this, the quasi-proportional resonance + repetitive control of the current inner loop of the H6-bridge photovoltaic inverter and the harmonic suppression method controlled by the additional trap of the voltage outer loop are proposed. The parameter design method of the voltage controller of the current inner loop quasi-proportional resonance + repeat controller and the voltage outer loop additional trap based on the frequency domain analysis is given, and the stability of the designed control system is verified. A set of 10k W 6-bridge photovoltaic inverter experiment platform is set up, and the voltage controller of the designed current inner loop quasi-proportional resonance + repeat controller and the voltage outer loop additional trap is tested. The results show that the THD of the output current of the H6-bridge PV inverter is 2.273% under the proposed harmonic rejection strategy, and the THD of the inverter output current under the conventional quasi-proportional resonance control strategy is 2.977%, and the proposed current inner-loop quasi-proportional resonance + repeat control, And the output current of the H6-bridge photovoltaic inverter under the control of the voltage outer-loop additional trap has good electric energy quality.
【学位授予单位】：深圳大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TM464;TM615
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