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【期刊论文】Power Flow Control Approach to Power Systems With Embedded FACTS Devices
孙元章, Ying Xiao, Y. H. Song, Senior Member, IEEE, and Y. Z. Sun
IEEE TRANSACTIONS ON POWER SYSTEMS, VOL. 17, NO.4, NOVEMBER 2002,-0001,():
-1年11月30日
This paper focuses on developing an approach to steady-state power flow control of flexible ac transmission systems (FACTS) device-equipped power systems. Based on a power-injection model of FACTS devices and an optimal power flow model, a novel versatile power flow control approach is formulated, which is capable of implementing power flow control incorporating any FACTS device flexibly. Different from existing FACTS device control approaches, the active and (or) reactive power injections are taken as independent control variables. Therefore, using this method, Jacobian matrix need not be changed, although various FACTS devices possess different physical models and different control parameters. Furthermore, it enables the integration of FACTS devices into the existing power system analysis and control programs efficiently. Physical limits of the FACTS devices are also considered in the model. Numerical results on a reduced practical system and a 1500-bus practical system with various FACTS devices are presented to illustrate the vigorousness of the proposed approach.
Flexible ac transmission systems (, FACTS), ,, optimal power flow,, power flow control,, power-injection model.,
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【期刊论文】Application of Unified Power Flow Controller to Available Transfer Capability Enhancement
孙元章
,-0001,():
-1年11月30日
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孙元章, Y.Z. Sun, M. Cao, T.L. Shen and Y.H, Song
IEE Proc.-Gener. Transm, Distrib., Vol, 149, No.3, May 2002,-0001,():
-1年11月30日
A method of pre-feedback to formulate the generalised forced Hamiltonian system model for speed governor control systems is proposed. Furthermore, passivation controllers are designed based on the scheme of Hamiltonian structure for single machine infinite bus and multimachine power systems. In particular, in the case of multimachine systems, all the variables in the control law are only relevant to the state variables of the local generator, which means that a decentralised controller is achieved. Simulation results of a four-machine system show that the controller can enhance power system transient stability.
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【期刊论文】A hybrid stochastic approach to available transfer capabUity evaluation
孙元章, Y.Xiao, Y.H.Song and Y.Z.Sun
IEE Proc.-Gener. Transm. Distrib., Vol. 148, No.5, September 2001,-0001,():
-1年11月30日
A novel methodology is proposed to evaluate the available transfer capability (ATC) of prescribed interfaces in connected power networks. With respect to the major uncertain factors affecting the ATC value, a realistic stochastic model is formulated in which availability of generators and circuits are considered as random variables following binomial distributions. With reasonable assumptions, fluctuations of loads are taken into consideration as normally distributed variables. To deal with the complex problem formulated with both discrete and continuous variables involved efficiently, a hybrid stochastic approach which takes advantage of both two-stage stochastic programming with recourse and chance constrained programming is proposed. The necessity of considering the impact of uncertainties on ATC assessment is demonstrated clearly by using the IEEE 118-node standard. Numerical results also illustrate the capability and efficiency of the proposed methodology.
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【期刊论文】Novel Energy-Based Lyapunov Function for Controlled Power Systems
孙元章, Y.Z. Sun. Y.H. Song, X. Li
,-0001,():
-1年11月30日
This loiter first derivcs Hamiltoniam cquation fora power system with cxcitation control A modified energy-based Lyapunov function is thon presented for fast tcabsuebt stability analysis of con trolled power systems.
Brunel University,, Uk, Tsinghua Univcrsity,, China
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