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题名	基于超导储能的动态电压补偿系统的控制研究; 基于超导储能的动态电压补偿系统的控制研究
作者	1李学斌,电工研究所
学位类别	博士
答辩日期	2008-01-11
授予单位	中国科学院电工研究所
导师	1肖立业,电工研究所
关键词	超导储能系统 换流器 滑模控制 分程控制 电压补偿 Superconducting magnetic energy storage system, Converter, Sliding mode control, Split ranging control, Voltage compensation
其他题名	基于超导储能的动态电压补偿系统的控制研究
中文摘要	电能质量的改善是电力系统目前面临的重要问题之一。超导储能系统在调节电网质量、增强电网稳定性及用户安全性方面，有着传统装置不可比拟的优点。本文重点研究了超导储能系统进行动态电压补偿的一些关键技术问题，并将级联电路引入超导储能系统中，分析了其控制及工作特性。 首先，进行了电压补偿目标的分析与比较，针对三种基本的补偿目标分析了超导储能装置在补偿电网电压跌落时有功能量的消耗情况，进一步分析了当超导储能系统在三相三线制及三相四线制情况下进行电压补偿的控制差异，并进行了有功能量补偿的比较。 提出了基于dq0变换的快速电压跌落检测及补偿方法，根据换流装置的控制模型分析了储能装置在补偿电压跌落时的开环及闭环的控制品质，详细讨论了电路参数对控制误差以及响应时间的影响。仿真及试验验证了控制方法的正确性，理论分析结果有助于提高储能系统的控制精度，并根据具体条件设计合理的控制参数。 建立了换流器的数学模型，并根据模型提出了一种滞环滑模电压补偿闭环控制策略，采用滞环能够降低开关频率。深入分析了电网以及换流器自身参数对滞环滑模控制稳定性的影响以及控制参数的选择。基于级联型换流器控制，首次提出了一种滞环滑模分程控制策略，控制系统根据控制参数决定功率模块投入工作的数量，因而换流器输出的控制电压波形为阶梯波，进一步降低了开关损耗。仿真及试验结果表明滑模控制方法具有一定的自适应能力及稳定性，能够快速消除电网电压波动对负荷的影响。 本文设计了一种基于高速DSP的控制电路以及试验样机，并进行了电压补偿及控制算法的试验工作。样机电压补偿试验结果说明本文提出的控制策略能够满足电压补偿要求。 Power quality is one of the most important problems in modern electrical power systems. Superconducting magnetic energy storage system (SMES system), with some incomparable traits, is excellent in controlling the power quality, stabling power systems and protecting the customer facilities. The study concentrates mainly on the dynamic voltage compensation by SMES and the power converters. It is for the first time to introduce cascaded converter topology into SMES system, and consequently the control schemes have been analyzed. Three fundamental types of voltage injection methods, which effect the real power consumption of the SMES system when regulating voltages, have been analyzed in detail. This study is indispensable for the safe operation of the SMES. The voltage compensation differences under three phase four-wire system and three-wire system have been considered, and the real power compensation as well. A fast voltage sag detecting and compensation method based on dq0 transform has been brought forward. According to the control model of the converter, the open-loop and the close-loop control quality when compensating sags by SMES system have been studied to illuminate the effect of the circuit parameters on the control error and response time. Simulations have confirmed the control equations and the prototype converter experiments have also been carried out. The results help to improve control precision and to choose reasonable control parameters. Based on the converter model of the SMES system a pseud-sliding mode control scheme with hysteresis loop has been proposed to minimize system vibration. The characteristics of the control scheme and the influences imposed by different circuit parameters have been thoroughly analyzed. A split ranging VSS control scheme based on sliding mode also has been presented to further decrease the switching frequency and improve the control performance. By the proposed scheme the output control signal of cascaded converter is scaled according to the power grid situation, and then different number of power cells are/is brought into operation according to variable magnitude of voltage aberration. This algorithm makes the power cells work intermittently at optimized switching mode in order to reduce system losses. The simulation results show that the SMES system controlled by the proposed algorithm can stabilize load voltage under strong disturbance. This dissertation developed a fast digital control system and an experimental converter system to test the proposed control schemes. The voltage compensation experiments on the prototype converter have been carried out. The compensation results show that the proposed topology and the control strategy can fulfill the requirements.
语种	中文
公开日期	2010-10-18
页码	121
分类号	TM1
内容类型	学位论文
源URL	[http://ir.iee.ac.cn/handle/311042/6672]
专题	电工研究所_其他部门_其他部门_博士学位论文
推荐引用方式 GB/T 7714	1李学斌,电工研究所. 基于超导储能的动态电压补偿系统的控制研究, 基于超导储能的动态电压补偿系统的控制研究[D]. 中国科学院电工研究所. 2008.

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