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装有统一潮流控制器的多机电力系统Phillips—Heffron模型及其应用 总被引:7,自引:4,他引:3
建立了装有统一潮流控制器的多机电力系统Phillips-Heffron模型,并通过一实例演示了Phillips-Heffron模型的如下应用:①研究统一潮流控制器的各种控制对电力系统振荡稳定性的影响;②设计统一潮流控制器的阻尼控制。 相似文献
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针对UPFC内部多个SISO控制器单独运行效果良好,但联合运行时各控制器间存在负交互影响的问题,对UPFC各控制器间的工作关系进行了详细分析。结果表明,无功潮流控制引起的负交互影响程度与有功、无功控制器间的耦合程度有关。根据负交互影响存在的原因,应用分层结构设计了潮流解耦控制器,其中外层控制为内层控制提供参考信号,内层控制应用解耦控制策略来实现有功、无功解耦的功能。利用PSCAD建立了UPFC的动态模型,比较分别采用以有功、无功电压为控制目标的常规潮流控制器及潮流解耦控制器时的仿真结果。验证了潮流解耦控制器的优越性,可有效解决无功潮流调节时与其他控制器间的负交互影响问题。 相似文献
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基于电力系统非参数化模型设计统一潮流控制器 总被引:2,自引:0,他引:2
采样调节器的设计最突出的特点之一是根据被控对象的非线性,不确定系统的非参数化模型-系统的单位开环阶跃响应等进行控制器的设计,以保证闭环控制系统的稳定性,最优化和鲁棒性,这一方法在电力系统控制中的应用极有潜力。因为在电力系统中,通过现场试验获得控制器安装地点的单位开环阶跃响应通常要比建立系统的参数化模型简单得多,该文演示了如何将采样调节器设计的方法应用于统一潮流控制器(UPFC)的设计及由一个多变量采样调节器同时实现统一潮流控制器的潮流控制和电压调节功能,文中还给出了设计和仿真的结果。 相似文献
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在对串联补偿、并联补偿、移相调节和统一潮流控制进行深入分析的基础上 ,通过广义潮流控制器(Generalized Power Flow Controller,简称GPFC) 的概念分析了上列这些潮流控制方式的统一处理方法。该方法很容易与常规 算法相结合,并能在程序中以统一的数据格式计及多个各种潮流控制方式的 作用。实例分析表明,本文方法具有作用方便和灵活的特点,可以为更好地 分析各种潮流控制方式对电力系统的影响提供有效的工具。 相似文献
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针对统一潮流控制器(UPFC)与同步发电机励磁控制系统,结合控制系统控制特性及多指标控制设计理念,选取多个目标状态量线性组合为输出函数,运用多指标非线性控制算法,设计了统一潮流控制器(UPFC)的新控制策略,最后在单机无穷大系统上对其进行暂态仿真.仿真结果表明,所设计的多指标协调控制系统能够很好的解决接入点静态偏移的问题,并有效地控制节点电压和线路的潮流,改善了电力系统的暂态稳定性. 相似文献
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This paper presents a new procedure for steady state power flow calculation of power systems with multiple flexible AC transmission system (FACTS) controllers. The focus of this paper is to show how the conventional power flow calculation method can systematically be modified to include multiple FACTS controllers. Newton–Raphson method of iterative solution is used for power flow equations in polar coordinate. The impacts of FACTS controllers on power flow is accommodated by adding new entries and modifying some existing entries in the linearized Jacobian equation of the same system with no FACTS controllers. Three major FACTS controllers (STATic synchronous COMpensator (STATCOM), static synchronous series compensator (SSSC), and unified power flow controller (UPFC)) are studied in this paper. STATCOM is modeled in voltage control mode. SSSC controls the active power of the link to which it is connected. The UPFC controls the active and the reactive power flow of the link while maintaining a constant voltage at one of the buses. The modeling approach presented in this paper is tested on the 9-bus western system coordinating council (WSCC) power system and implemented using MATLAB software package. The numerical results show the robust convergence of the presented procedure. 相似文献
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This paper investigates the application of multivariable control technique to multi-input multi-output (MIMO) non-linear problem of a power transmission system with UPFC. The main objective is to achieve effective independent control of real and reactive power flows with zero dynamic interactions. Towards achieving the objective, feed-back linearization control (FBLC) scheme is implemented in the laboratory for the control of UPFC. A two-bus power system with UPFC has been built in laboratory and the control implementation has been carried out using DSP TMS320LF2407A. Both power flow control and power oscillation damping issues are addressed. The excellent correlation between simulation and experimental results using a laboratory test system establish the validity of the proposed scheme. Although the power stage of the developed laboratory system is a scaled down model and has limited ratings, the FBLC controller can be used equally effectively in a more realistic system set up by appropriate scaling factors for the fed-back signals of currents and voltages and for initiating the inverter voltages. The proposed controller enables UPFC to independently control the real and reactive power with absolute decoupling. Also it is found that the overall performance of the system with the proposed controller is far superior to that using conventional cascade PI control structure. 相似文献
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研究了多机系统中使用统一潮流控制器(UPFC)抑制电力系统多模态振荡的可行性.首先推导了作为UPFC概念延伸的多端统一潮流控制器(MUPFC)的非线性动态模型和线性化的Phillips-Heffron模型.利用UPFC和MUPFC具有多个控制回路的特点,提出在其多个控制回路上附加多个阻尼控制器来阻尼多模态振荡.通过模态分析,采用可控性指标对系统中的各个弱阻尼模态选取有效的控制回路,并设计了附加阻尼控制器.仿真结果表明,通过该方法确定的在一个UPFC或MUPFC上设置的多个附加阻尼控制器能够成功实现对电力系统多模态振荡的抑制. 相似文献
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Contents This paper describes the implementation of a new control approach for the Unified Poer Flow Controller (UPFC), which provides active filtering capabilities to this equipment, besides the functions of power flow control and voltage control, as originally proposed by L. Gyugyi [1,2]. The power circuit is made up from two PWM converters which share a common dc link without the need of dc power supplies. An integrated controller attends to both series and shunt converters of the UPFC. It is based on the theory of instantaneous active and reactive power defined in the --0 reference frame [3,4]. A complete model of the new UPFC has been implemented in a digital simulator. Simulation results have confirmed that the new approach has higher performance than those UPFCs which use traditional definitions of powers in the controller.
Ein universeller Lastflßregler相似文献