基于模糊控制和专家系统的多FACTS电压稳定协调控制

发布时间：2018-05-06 01:19

本文选题：电压稳定 + 模糊控制　；参考：《华北电力大学》2014年硕士论文

【摘要】：电压稳定是保证系统安全、稳定、经济运行的重要因素之一,电压过低或过高都不能满足系统稳定运行的要求,严重时将会损坏系统设备甚至导致电压崩溃。随着电力电子的快速发展,用于电压无功控制的SVC、TCSC和可控高抗逐渐引起了研究人员的关注。FACTS装置的引入在提高电压稳定性的同时也存在着交互影响,使得电压稳定问题并没有得到有效的解决。本文根据电压稳定的控制特点,提出了一种基于模糊控制和专家规则的电压稳定控制策略,其主要工作有： (1)在恒功率因数负荷和感应电动机负荷下分析SVC和TCSC补偿容量对电压稳定性的影响。首先介绍了FACTS装置的工作原理和数学模型,然后基于潮流方程分析不同负荷水平下SVC和TCSC对电压稳定性的影响,分析结果表明在简单系统中,一定范围内投入无功补偿容量越多越有利于提高电压水平,超过限值则不利于电压稳定的控制。 (2)提出了基于专家规则的电压稳定协调控制策略。通过分析不同电压稳定问题的控制特点,对中长期电压稳定问题采用电压差比例控制方式,而暂态电压稳定问题采用投切控制方式,并提出了基于专家规则的电压稳定协调控制策略,然后在PSASP软件中设计SVC、TCSC和可控高抗控制器并进行仿真验证。 (3)基于遗传算法对SVC和TCSC的控制参数进行优化,结果表明当两者联合补偿时,在一定范围内增大某一设备的补偿容量,越有利于提高系统的电压稳定性,但是TCSC补偿容量过多则会引起电压波动甚至起到反作用,对电压稳定控制有不利影响。 (4)根据FACTS装置对电压稳定问题的控制规则,进一步提出采用模糊控制和专家规则以提高电压稳定水平的控制策略。首先介绍模糊控制原理,并在分析电压稳定控制规则的基础上,提出了基于模糊控制和专家规则的电压稳定控制方法,然后设计了SVC和TCSC的模糊控制器,最后在Matlab仿真平台上对模糊控制器的效果进行了仿真分析。
[Abstract]:Voltage stability is one of the important factors to ensure the safety, stability and economic operation of the system. If the voltage is too low or too high, it can not meet the requirements of the stable operation of the system, which will damage the system equipment and even lead to the voltage collapse. With the rapid development of power electronics, the introduction of SVC TCSC and controllable high reactance (TCSC) for voltage and reactive power control has attracted the attention of researchers. The introduction of facts devices not only improves voltage stability, but also has interactive effects. The problem of voltage stability has not been solved effectively. According to the characteristics of voltage stability control, a voltage stability control strategy based on fuzzy control and expert rules is proposed in this paper. The main work is as follows: 1) the effect of compensation capacity of SVC and TCSC on voltage stability is analyzed under constant power factor load and induction motor load. This paper introduces the working principle and mathematical model of FACTS device, and then analyzes the influence of SVC and TCSC on voltage stability at different load levels based on power flow equation. The results show that in simple system, The more reactive power compensation capacity is in a certain range, the higher the voltage level is, but the more the limit is, the less the voltage stability control is. (2) an expert rule based coordinated control strategy for voltage stability is proposed. By analyzing the control characteristics of different voltage stability problems, the voltage difference proportional control method is adopted for the medium and long term voltage stability problems, while the switching control method is used for the transient voltage stability problems. The coordinated control strategy of voltage stability based on expert rule is proposed, and then the SVC TCSC and controllable high reactance controller are designed in PSASP software and verified by simulation. 3) the control parameters of SVC and TCSC are optimized based on genetic algorithm. The results show that increasing the compensation capacity of a certain equipment within a certain range is more beneficial to improve the voltage stability of the system. However, excessive compensation capacity of TCSC will cause voltage fluctuation or even counteraction, which has adverse effect on voltage stability control. 4) according to the control rules of voltage stability problem in FACTS, fuzzy control and expert rules are proposed to improve the voltage stability level. Firstly, the principle of fuzzy control is introduced, and based on the analysis of voltage stability control rules, a voltage stability control method based on fuzzy control and expert rule is proposed, and then the fuzzy controller of SVC and TCSC is designed. Finally, the effect of fuzzy controller is simulated and analyzed on Matlab simulation platform.
【学位授予单位】：华北电力大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TM712

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