基于统一潮流控制器（UPFC）的电力系统稳态潮流控制的模型和算法

本文在分析统一潮流控制器（ＵＰＦＣ）的基础上，导出了ＵＰＦＣ的潮流控制模型，提出了易于同常规ＰＱ分解潮流计算相结合的算法。算例表明，该方法能有效地用于分析ＵＰＦＣ对潮流控制作用，且具有较好的收敛性     

基于统一潮流控制器（UPFC）的电力系统稳态潮流控制的模型…

本文在分析统一潮流控制器的基础上，导出了ＵＰＦＣ的潮流控制模型，提出了易于同常规ＰＱ分解潮流计算相结合的算法，算例表明，该方法能有效地用于分析ＵＰＦＣ对潮流控制作用，且具有较好的收敛性。     

含统一潮流控制器的电力系统新型潮流算法

本文通过对统一潮流控制器（UPFC）在电力系统中控制原理的分析,提出了一种计及UPFC的新型潮流算法,在原有潮流计算牛顿一拉夫逊法的基础上,将UPFC对系统的影响转移到对潮流方程的修正中去,选取新的状态变量,为电力系统稳态潮流控制打下了基础,算例支持了本文思想和算法的正确性。     

计及统一潮流控制器的电力系统状态估计

应用灵活交流输电系统（FACTS）技术可对电力系统潮流进行灵活控制,从而充分发挥现有电力系统的潜力,其中统一潮流控制器（UPFC）是FACTS的重要组件之一。基于传统状态估计模型,通过利用UPFC的功率注入模型,将它对于状态估计的作用转移到所在线路的量测节点上,提出了计及UPFC的状态估计模型。该方法可以完整计及UPFC对电力系统的影响,同时能有效利用原有的状态估计算法程序。算例表明所提出的模型有效、可行,具有一定的实用价值。     

用常规潮流程序直接计算含统一潮流控制器的电力网络潮流

文章介绍一种用常规潮流计算程序直接计算含多个统一潮流控制器(UPFC)的电力网络潮流的方法.     

含PQV节点的潮流计算在UPFC中的应用

首先对统一潮流控制器（ＵＰＦＣ）在电力系统中的控制方式进行了研究,进而提出了一种计及ＵＰＣ的含ＰＱＶ节点的潮流计算方法。该方法能方便地计算了出ＵＰＦＣ的控制参数,ＩＥＥＥ１４节点系统及ＩＥＥＥ３０节点系统的仿真结果验证了其有效性。     

统一潮流控制器功率控制特性的分析

统一潮流控制器（ＵＰＦＣ）控制规律的求取是ＵＰＦＣ装置实现其功能的关键,而研究ＵＰＦＣ的功率特性是解决ＵＰＦＣ控制问题的前提,为此建立了含ＵＰＦＣ的电力系统稳态模型,通过合理地选取控制变量,将状态方程线性化,分析了ＵＰＦＣ的功率控制特性和多个ＵＰＦＣ功率特性间的相互影响程度。通过实际潮流计算结果与线化后所得结果的比较,表明ＵＰＦＣ对电力系统的作用是趋于线性的。     

基于电力系统非参数化模型设计统一潮流控制器

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。     

统一潮流控制器(UPFC)的工程 实践及应用

随着负荷的发展,湖南电网负荷中心输电能力不足,潮流分布不均匀,输电断面卡脖子问题日益凸显。本文首先介绍了统一潮流控制器(UPFC)在国内外电网中的应用现状、在电网运行控制中发挥的作用及其技术的最新发展,介绍了UPFC的模型、功能及应用案例,以长沙电网负荷中心为例研究了湖南电网的概况和存在的问题,得出了在湖南电网中加装UPFC解决运行控制中存在问题的可行性建议。     

计及统一潮流控制器的可用输电能力的计算

在电力市场环境下，研究和计算区域间可用输电能力可以引导市场参与者进行电能交易，保证充分利用电网输电容量，而研究计及FACTS装置的可用输电能力的计算更具有理论和实际意义。文中基于最优潮流，提出计及统一潮流控制器的可用输电能力的计算模型，利用功率注入法，将统一潮流控制器对潮流的控制作用转移到所在线路两侧的节点上，在不修改原有节点导纳阵的情况下嵌入模型。算法上采用逐步二次规划法，IEEE．30节点系统的计算结果表明，所提出的模型及算法是有效的和可行的。     

Power system damping enhancement using unified power flow controller (UPFC)

The Unified Power Flow Controller (UPFC) can inject voltage with controllable magnitude and phase angle in series with a transmission line. It can also generate or absorb controllable reactive power. UPFC is expected to be able to damp power system oscillations more effectively than power electronics devices such as SVG and TCSC. In this paper, a control system design of a UPFC for power system damping enhancement based on the eigenvalue control method is proposed. It is made clear that the best design method for the power system damping enhancement is to determine steady‐state values of the UPFC control variables and the control parameters of the UPFC such as gains and time constants simultaneously, because the controllability of UPFC depends on the steady‐state values of UPFC and the power flow condition. The effectiveness of the proposed control system taking into account UPFC inverter ratings is verified by digital time simulation. Furthermore the effects of the input signals to the UPFC controller on small‐signal stability and transient stability enhancement are studied, and it is made clear that UPFC controllers using global information are more effective for power system damping enhancement than those using local information because global information has stronger observability for power system oscillations than local information. © 2000 Scripta Technica, Electr Eng Jpn, 133(3): 35–47, 2000     

Comprehensive modelling of the unified power flow controller for power system control

In this paper, comprehensive modelling of the unified power flow controller (UPFC) for power flow, voltage, angle and impedance controls is presented. The control modes include some thirteen different power flow, voltage, angle and impedance control functions. The similarities and differences between some of the control modes and those of traditional transformers and series compensation devices are also discussed. The control modes were successfully implemented in a Newton power flow algorithm. Numerical examples are given on the IEEE 30-bus system and the IEEE 118-bus system to illustrate the feasibility and the performance of the Newton power flow algorithm.     

基于矩阵变换器的统一潮流控制器研究

由于矩阵变换器的优越电气性能,将其应用于统一潮流控制器中,相对传统的统一潮流控制器,减小了体积和成本,具有良好的输入输出电气特性。通过对国内外相关文献报道,从三个方面简介了有关基于矩阵变换器的统一潮流控制器的研究:矩阵变换器;统一潮流控制器模型及其控制;基于矩阵变换器的统一潮流控制器应用研究。     

Simulation study of unified power flow controller

The increasing complexity of ac power networks requires a high‐performance power flow control system in order to obtain the desired power flow and enhance static and dynamic stability. One of the most effective power electronic systems to satisfy these requirements is a UPFC (Unified Power Flow Controller) employing self‐commutated converters. This paper presents basic control strategies and simulation results for the UPFC using the EMTP (Electromagnetic Transient Program). The simulations were carried out for start and stop operations, power flow change operations in normal system conditions, as well as operations during system fault conditions. Thyristor‐based bypass switches are used for the protection of the series compensator of the UPFC from system fault currents, and satisfactory protection capability was confirmed. © 1999 Scripta Technica, Electr Eng Jpn, 127(1): 23–30, 1999     

Robust modeling of the interline power flow controller and the generalized unified power flow controller with small impedances in power flow analysis

The interline power flow controller (IPFC) and the generalized unified power flow controller (GUPFC) are two innovative configurations of the convertible static compensator (CSC) of FACTS. In this paper, direct modeling of the practical series or/and shunt operating inequality constraints of the IPFC and the GUPFC in power flow calculations are presented. Special initialization of a solution with the IPFC and GUPFC is also derived. Furthermore, an impedance compensation technique is proposed to deal with the numerical instability or the numerical difficulty of the IPFC and GUPFC models when either their coupling transformer impedances are too small or they are transformer-less controllers. Condition number analysis of the Newton power flow equations is given to get insights of the numerical instability of the voltage sourced models of the IPFC and GUPFC with small impedances. Numerical examples are given based on the IEEE 118-bus system, IEEE 300-bus system and a large scale system with 1000-buses.     

Unified power flow controller models for three-phase power flow analysis

In this paper, three models of the unified power flow controller (UPFC) suitable for three-phase power flow analysis in polar coordinates are presented. The symmetrical components control model can be used to control the positive-sequence voltage of the shunt bus and the total three-phase active and reactive power flows of the transmission line while the injected shunt voltages and the series voltages are balanced, respectively; the general three-phase control model can be used to control the three shunt phase voltages and the six independent active and reactive power flows of the transmission line; the hybrid control model can be used to control the positive-sequence voltage of the shunt bus and the six independent active and reactive power flows of the transmission line. The proposed UPFC models were successfully implemented in a three-phase Newton power flow algorithm in polar coordinates. In the implementation of these UPFC models, transformers of some common connection types, which connect the UPFC with the network, are explicitly represented. Numerical results based on a five-bus system and the modified IEEE 118-bus system are given to illustrate the UPFC control models and demonstrate the computational performance of the three-phase Newton power flow algorithm.     

含广义统一潮流控制器(GUPFC)的最优潮流模型和算法研究

广义统一潮流控制器(GUPFC)作为比统一潮流控制器(UPFC)控制能力更强大的FACTS装置，其对最优潮流(Optimal Power Flow)的影响需要深入地研究。根据GUPFC的控制原理，基于功率注入法建立了含GUPFC的OPF数学模型，并采用基于信赖域内点法的最优潮流算法予以求解。该算法采用多步中心校正原一对偶内点法连续求解线性规划子问题，通过信赖域决定线性化步长的选取。对IEEE30和118节点系统作了数值计算，结果表明，GUPFC不仅可控制节点电压而且可控制多条线路潮流，显示出强大的控制能力，同时也说明了含GUPFC的OPF数学模型和算法的可行性和有效性。     

含风电场电力系统的潮流计算

潮流计算是分析风电对电网影响的基础,在异步发电机稳态等效电路的基础上,通过动态改变风电场的无功功率、考虑风速、有功功率,机端电压和滑差率,提出了计算含风电场的电力系统潮流的一种简单可行的方法,并通过一含风电的配电网系统验证了该算法的可行性。     

电力系统潮流计算中的频率计算

在电力系统潮流计算之前,先进行频率计算.为提高频率和潮流计算精度,通过调整发电机和负荷,比较真实地模拟了实际电力系统发生扰动后的动态过程,提出频率计算流程;并以Ⅰ型考题为例进行调频计算,计算结果与给定结果一致,验证了该计算方法的正确性.