【作者】 胡宗军；

【导师】 牟道槐；

【作者基本信息】 重庆大学 ， 电气工程， 2007， 硕士

【摘要】 随着我国电力系统的快速发展,用户对供电质量和可靠性要求的提高,电压成为衡量电能质量的一个重要指标,保证用户处的电压接近额定值,成为电力系统运行控制的一项基本任务,电压偏移过大不仅对用户的正常工作产生不利影响,还可能使网损增大,甚至危及系统运行的稳定性。因此充分利用各种调压手段和无功补偿装置实现电压无功的综合控制对提高电能质量和降低网损具有重要的意义。目前我国变电站调压的主要手段是采用有载调压变压器和并联补偿电容器组,在目前广泛采用计算机实施自动控制的情况下,出现了多种控制策略,显然基于一种控制目的而出现了多种控制策略的原因在于各种控制策略均存在着一些不足之处,甚至涉及一些原则性的不妥之处,目前广泛使用的“九分区”控制装置普遍就出现频繁操作而难于使用的问题,因此对这些控制策略进行深入的分析很有必要,在此基础上方能寻找出理论上合理、工程上实用的控制方法。特别是随着我国发电容量的迅速增长,在供电充足的情况下,用户必然对电压质量提出更高的要求,电压质量将作为电力市场竞争的主要因素,因此电压质量是一个急待解决的技术问题,具有重要的实用意义。论文根据目前我国变电站电压无功控制的研究现状,主要做了以下工作:①全面阐述了国内外变电站电压与无功控制策略的研究状况,分析了各种策略所存在的问题;②阐述了变电站电压无功的控制特性,分析了变电站电压无功控制的基本原理,从理论上分析了现行九分区电压无功控制策略所存在的问题;③建立了变电站电压无功控制的数学模型,对目前广泛使用的九分区控制策略的动作特性进行了仿真分析,找出了九分区控制策略存在的问题以及影响其动作特性的因素;④提出了变电站电压无功控制的改进方法:以重庆江津电网为例,提出以变电站实时采集的电压、电流和功率为输入量,建立变电站电压无功实时控制的数学模型,提出了算法,并对其可行性和正确性进行了仿真验证。更多还原

【Abstract】 With the rapid development of nation power system, and the increasing requirements of consumer to power quality and reliability, voltage becomes one of the most important power quality indexes. Ensuring the voltage quality of consumer approach the normal value become a basic task of power system operation and control, voltage deviation too large not only has disadvantage impact to the consumer’s normal work, but also increases the power loss, even endangers the system operation stability. So it has great meaning to use various voltage adjustment measure and reactive power compensation equipment to implement voltage/Var compositive controlling to improve electric energy quality and reduce the power loss.Now the primary voltage adjustment measure in substation of our country is On-Load transformer Tap Changer and parallel compensatory capacitor. Under the situation of widely using of computer to implement automatic controlling, various controlling strategy have appeared, apparently the reason that various controlling strategy appeared basing on one control objective consist in each control strategy has some deficiencies, even has involved in some principle misgivings, now the Nine-zone controlling equipment which has used widely appeared frequent operation and difficult to use. So it is necessary to analyze the control strategy thoroughly, based on which we can find out the theory reasonable and engineering practicality control method. Especially with the rapid increasing of generating capacity of our country, under the situation of power supply is abundant, the consumer will bring forward higher demand to the electric energy quality necessarily, and the voltage quality will become the primary competition factor of power market. So it is a technique problem which should resolve urgently, and it has great practicality meaning.In this thesis, basing on the research condition of voltage/Var controlling of our country, the following tasks are done:①the research condition of voltage and reactive power control strategy in substation in and abroad are represented, and the problem of each strategy is analyzed.②the substation voltage/Var control characteristic is represented, and the principle of substation voltage/Var controlling is analyzed, the problem of Nine-zone voltage/Var control strategy is analyzed in theory.③the mathematical model of substation voltage/Var controlling is established, and the action characteristic is simulated, and the problem of Nine-zone control strategy and the factor which influence its action characteristic are found out.④the improving method of substation voltage/Var controlling is put forward: take Chongqing Jiangjin power network for example, basing on the real-time acquisited voltage、current and power of substation as the input quantity, the real-time voltage/Var controlling mathematical model is established, the arithmetic is put forward, and the feasibility and validity are verified through simulation.更多还原