In this paper, a new Modified Bacterial Foraging Algorithm (MBFA) method is developed to incorporate FACTS devices in optimal power flow (OPF) problem. This method can provide an enhanced economic solution with the us...In this paper, a new Modified Bacterial Foraging Algorithm (MBFA) method is developed to incorporate FACTS devices in optimal power flow (OPF) problem. This method can provide an enhanced economic solution with the use of controllable FACTS devices. Two types of FACTS devices, thyristor controlled series compensators (TCSC) and Static VAR Compensator (SVC) are considered in this method. The basic bacterial foraging algorithm (BFA) is an evolutionary optimization technique inspired by the foraging behavior of the E. coli bacteria. The strategy of the OPF problem is decomposed in two sub-problems, the first sub-problem related to active power planning to minimize the fuel cost function, and the second sub-problem designed to make corrections to the voltage deviation and reactive power violation based in an efficient reactive power planning of multi Static VAR Compensator (SVC). The specified power flow control constraints due to the use of FACTS devices are included in the OPF problem. The proposed method decomposes the solution of such modified OPF problem into two sub problems’ iteration. The first sub problem is a power flow control problem and the second sub problem is a modified Bacterial foraging algorithm (MBFA) OPF problem. The two sub problems are solved iteratively until convergence. Case studies are presented to show the effectiveness of the proposed method.展开更多
以同一系统中静止同步串联补偿器(static synchronous series compensator,SSSC)和静止无功补偿器(static var compensator,SVC)的共同作用为研究对象,建立了2者的数学参数模型,推导出控制器之间相互作用的量化关系式。通过控制参数分...以同一系统中静止同步串联补偿器(static synchronous series compensator,SSSC)和静止无功补偿器(static var compensator,SVC)的共同作用为研究对象,建立了2者的数学参数模型,推导出控制器之间相互作用的量化关系式。通过控制参数分析和仿真分析得出结论:灵活交流输电(FACTS)装置的控制方式和电气耦合程度对SSSC和SVC的相互作用有很大影响。最后基于直接反馈线性化(DFL)方法设计了SSSC和SVC协调控制器,仿真结果验证了该协调控制策略的有效性。展开更多
串联变压器作为统一潮流控制器(UPFC)系统中的关键设备,承担着换流器与交流系统交换功率的重要作用,一方面需要匹配交流系统电压与换流器直流电压,另一方面在电气结构上实现交流系统与换流器的隔离。UPFC用串联变压器在电气结构上不同...串联变压器作为统一潮流控制器(UPFC)系统中的关键设备,承担着换流器与交流系统交换功率的重要作用,一方面需要匹配交流系统电压与换流器直流电压,另一方面在电气结构上实现交流系统与换流器的隔离。UPFC用串联变压器在电气结构上不同于常规电力变压器,其一次侧绕组(线路侧绕组)分相接入三相线路,变压器一次侧绕组每相的首尾端拆开,经6个端口接入线路;二次侧绕组(阀侧绕组)与换流器连接,采用常规的星型或者角型接法。串联变压器的绕组需要具备承受系统短路电流的能力,同时需要具备持续一定时间的4倍过激磁耐受能力,对变压器的电气、结构等方面的设计提出了严酷的要求。文中结合南京220 k V西环网统一潮流控制器工程,分析了串联变压器的运行工况,以此为基础提出了串联变压器的关键设备参数,并对其恶劣工况下的耐受能力进行了仿真验证。展开更多
随着输电电压的升高、输电距离的增长,电力系统中安装的串联型柔性交流输电(Flexible AC Transmission,FACTS)装置日渐增多,如何抑制多个串联型FACTS元件间的交互影响并保证其协调运行就变得尤为重要。文章运用奇异值分解法(SVD)理论计...随着输电电压的升高、输电距离的增长,电力系统中安装的串联型柔性交流输电(Flexible AC Transmission,FACTS)装置日渐增多,如何抑制多个串联型FACTS元件间的交互影响并保证其协调运行就变得尤为重要。文章运用奇异值分解法(SVD)理论计算分析了多个串补元件同时投入运行时元件之间存在的交互影响,并利用PSCAD搭建仿真模型,进行了仿真验证。仿真结果表明,元件间交互影响造成的电压波动和传输功率不稳定对系统产生了不利的影响,并利用matlab进行傅立叶变换对稳定后的母线电压进行了谐波分析。展开更多
文摘In this paper, a new Modified Bacterial Foraging Algorithm (MBFA) method is developed to incorporate FACTS devices in optimal power flow (OPF) problem. This method can provide an enhanced economic solution with the use of controllable FACTS devices. Two types of FACTS devices, thyristor controlled series compensators (TCSC) and Static VAR Compensator (SVC) are considered in this method. The basic bacterial foraging algorithm (BFA) is an evolutionary optimization technique inspired by the foraging behavior of the E. coli bacteria. The strategy of the OPF problem is decomposed in two sub-problems, the first sub-problem related to active power planning to minimize the fuel cost function, and the second sub-problem designed to make corrections to the voltage deviation and reactive power violation based in an efficient reactive power planning of multi Static VAR Compensator (SVC). The specified power flow control constraints due to the use of FACTS devices are included in the OPF problem. The proposed method decomposes the solution of such modified OPF problem into two sub problems’ iteration. The first sub problem is a power flow control problem and the second sub problem is a modified Bacterial foraging algorithm (MBFA) OPF problem. The two sub problems are solved iteratively until convergence. Case studies are presented to show the effectiveness of the proposed method.
文摘以同一系统中静止同步串联补偿器(static synchronous series compensator,SSSC)和静止无功补偿器(static var compensator,SVC)的共同作用为研究对象,建立了2者的数学参数模型,推导出控制器之间相互作用的量化关系式。通过控制参数分析和仿真分析得出结论:灵活交流输电(FACTS)装置的控制方式和电气耦合程度对SSSC和SVC的相互作用有很大影响。最后基于直接反馈线性化(DFL)方法设计了SSSC和SVC协调控制器,仿真结果验证了该协调控制策略的有效性。
文摘串联变压器作为统一潮流控制器(UPFC)系统中的关键设备,承担着换流器与交流系统交换功率的重要作用,一方面需要匹配交流系统电压与换流器直流电压,另一方面在电气结构上实现交流系统与换流器的隔离。UPFC用串联变压器在电气结构上不同于常规电力变压器,其一次侧绕组(线路侧绕组)分相接入三相线路,变压器一次侧绕组每相的首尾端拆开,经6个端口接入线路;二次侧绕组(阀侧绕组)与换流器连接,采用常规的星型或者角型接法。串联变压器的绕组需要具备承受系统短路电流的能力,同时需要具备持续一定时间的4倍过激磁耐受能力,对变压器的电气、结构等方面的设计提出了严酷的要求。文中结合南京220 k V西环网统一潮流控制器工程,分析了串联变压器的运行工况,以此为基础提出了串联变压器的关键设备参数,并对其恶劣工况下的耐受能力进行了仿真验证。
文摘随着输电电压的升高、输电距离的增长,电力系统中安装的串联型柔性交流输电(Flexible AC Transmission,FACTS)装置日渐增多,如何抑制多个串联型FACTS元件间的交互影响并保证其协调运行就变得尤为重要。文章运用奇异值分解法(SVD)理论计算分析了多个串补元件同时投入运行时元件之间存在的交互影响,并利用PSCAD搭建仿真模型,进行了仿真验证。仿真结果表明,元件间交互影响造成的电压波动和传输功率不稳定对系统产生了不利的影响,并利用matlab进行傅立叶变换对稳定后的母线电压进行了谐波分析。
