含可控串补的电力系统可靠性非同调和灵敏度分析

发布时间：2018-09-07 18:37

【摘要】：可控串联补偿(thyristor controlled series compensation,TCSC)被广泛用于当代电力系统中,系统可靠性非同调指增加(减少)元件使系统可靠性降低(提高),可靠性灵敏度指系统可靠性对元件参数求导。本文针对含TCSC电力系统的可靠性非同调和可靠性灵敏度两个方面进行研究,主要研究成果如下:(1)TCSC设备可靠性建模。首先将TCSC等效为等值阻抗元件和其旁路断路器并联,建立TCSC简易可靠性模型。然后进一步将TCSC内部部件细致划分为不同层次子系统,提出TCSC可靠性分层等值详细模型。(2)基于TCSC简易模型,分析电力系统非同调特性。首先提出期望载荷和可靠性两方面指标关于TCSC可靠性参数解析模型,分析发现指标均关于TCSC参数同调。然后提出安装TCSC前后指标差值的解析模型、同调条件、同调裕度、非同调临界条件用以分析TCSC元件非同调特性。最后分析可靠性参数、负荷水平、补偿度、串补线路载荷约束对非同调特性影响。算例表明TCSC参数大于临界值时,系统非同调;补偿度越小、负荷水平越低、串补线路载荷约束范围越宽,非同调越易发生;断路器故障更易造成非同调。(3)基于TCSC详细模型,提出电力系统可靠性对TCSC部件可靠性参数的灵敏度分解算法。首先推导系统可靠性对多状态串补线路灵敏度解析模型,并提出串补线路对TCSC部件灵敏度模型。进而提出系统可靠性对TCSC部件灵敏度分解算法,灵敏度大小用以获取薄弱部件,利用灵敏度正负判断同调性。最后加入风电,分析风功率随机性对TCSC薄弱部件的影响。算例验证了算法可行性和正确性,有助于发现和改善柔性交流输电设备的薄弱环节,由于风电容量小,电力不足期望灵敏度受风电随机性影响比失负荷概率受风电影响小。
[Abstract]:Thyristor series compensation (thyristor controlled series compensation,TCSC) is widely used in modern power systems. The increase (decrease) of system reliability nonhomology index makes the system reliability decrease (improve), and reliability sensitivity refers to the derivation of system reliability to component parameters. In this paper, the reliability and reliability sensitivity of power system with TCSC is studied. The main research results are as follows: (1) Reliability modeling of TCSC equipment. At first, TCSC is equivalent to equivalent impedance element and its bypass circuit breaker is connected in parallel, and a simple reliability model of TCSC is established. Then, the internal components of TCSC are further divided into different levels of subsystems, and the hierarchical equivalent detailed model of TCSC reliability is proposed. (2) based on the simple TCSC model, the nonhomology characteristics of power system are analyzed. First, the analytical model of TCSC reliability parameters is presented in terms of expected load and reliability. It is found that the indexes are all related to TCSC parameters. Then an analytical model, homology condition, homology margin and nonhomology critical condition are proposed to analyze the nonhomology characteristics of TCSC elements before and after the installation of TCSC. Finally, the effects of reliability parameters, load level, compensation degree and load constraints on nonhomology characteristics are analyzed. The calculation example shows that the system is nonhomology when the TCSC parameter is larger than the critical value, the lower the compensation degree is, the lower the load level is, the wider the load constraint range of series-compensated line is, and the more easily non-homology occurs, the fault of circuit breaker is more likely to cause non-homology. (3) based on the detailed TCSC model, A sensitivity decomposition algorithm of power system reliability to TCSC reliability parameters is proposed. Firstly, an analytical model of the sensitivity of the system reliability to the multi-state series compensation line is derived, and the sensitivity model of the series compensation line to the TCSC part is proposed. Furthermore, a sensitivity decomposition algorithm for system reliability to TCSC parts is proposed. The sensitivity is used to obtain the weak parts, and the sensitivity is used to judge the homotonicity of the components. Finally, wind power is added to analyze the influence of wind power randomness on the weak parts of TCSC. The example proves the feasibility and correctness of the algorithm, which is helpful to find and improve the weak links of flexible AC transmission equipment. Due to the small wind power capacity, the expected sensitivity of power shortage is less affected by the randomness of wind power than by the probability of losing load.
【学位授予单位】：合肥工业大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TM732

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