• Title/Summary/Keyword: Transient stability

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Nodal price of the power system considering voltage and transient stability (전압안정도 및 과도 안정도틀 고려한 모선가격 산정)

  • Kim, Yong-Ha;Lee, Bum;Choi, Sang-Gyu;Jo, Sung-Lin;Jung, Hyeon-Sung;Oh, Suk-Hyeon;Kim, Dong-Geun
    • Proceedings of the KIEE Conference
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    • 2006.07a
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    • pp.129-130
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    • 2006
  • This paper presents a optimal power flow calculation algorithm considering voltage and transient stability. In this method, voltage stability margin and transient stability constraints is incorporated into a optimal power flow calculation formulation to guarantee adequate voltage and transient security levels in power system. In addition, this paper provides the Effect of Nodal Price and decomposed Element in Power System Operation. This Effect can be applied in the Estimation of Electric rates because the Electric market will be Competitive Market. The proposed method is applied to IEEE-24 Reliability Test System and the results shows the effectiveness of the method.

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Effect of a large-scale wind farm on power system transient stability (대단위 풍력발전단지의 과도 안정도 특성에 관한 연구)

  • Yoon, Dong-Hee;Oh, Sea-Sung;Jang, Gil-Soo
    • Proceedings of the KIEE Conference
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    • 2006.07a
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    • pp.226-227
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    • 2006
  • Wind power is one of the fastest growing distributed generation types. As part of a worldwide trend, the concerns of large wind generation have been risen rather than small wind generation since it influences the whole power system Including the transient stability. The objective of this paper is to understand the effect of a large-scale wind generation on power system transient stability and to develop a systematic procedure to assess the effect according to the location and capacity of a wind farm. In the proposed procedure, an index is presented to evaluate the appropriateness of the location and capacity of a wind farm for transient stability contingencies.

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A Study on Development of Optimal Power Flow Calculation Algorithm Considering Voltage and Transient Stability (전압 및 과도안정도를 고려한 최적조류계산 알고리즘 개발에 관한 연구)

  • Kim, Yong-Ha;Lee, Buhm;Choi, Sang-Kyu;Cho, Sung-Rin;Jung, Hyun-Sung;Oh, Seok-Hyun
    • Proceedings of the KIEE Conference
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    • 2005.11b
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    • pp.39-42
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    • 2005
  • This paper presents a optimal power flow calculation algorithm considering voltage and transient stability In this method, voltage stability margin and transient stability constraints is incorporated into a optimal power flow calculation formulation to guarantee adequate voltage and transient security levels in power system. The proposed method is applied to IEEE-24 Reliability Test System and the results shows the effectiveness of the method.

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Analysis of Effect of HVDC Transmission System on the Transient Stability (HVDC 송전망이 대형발전단지의 과도안정도에 미치는 영향 분석)

  • Jeon, Hyeok-Mo;Chun, Yeong-Han
    • The Transactions of The Korean Institute of Electrical Engineers
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    • v.65 no.1
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    • pp.1-8
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    • 2016
  • The characteristics of Korean power systems are large capacity of generation sites and concentrated load in Seoul metropolitan area. According to the national generation facility plan, more generation facilities are needed to be constructed as the electrical demands are forecasted to increase. Moreover, the size of generation sites are expected to increase, too. Therefore transient stability problems become worse and worse. Recently, the necessity of HVDC has been raised to overcome the difficulty of constructing HVAC transmission lines. This paper shows the analysis of transient stability when HVDC transmission system is added to the power system consisting of large generation sites.

Transient Stability Enhancement by DSSC with Fuzzy Supplementary Controller

  • Khalilian, Mansour;Mokhtari, Maghsoud;Nazarpour, Daryoosh;Tousi, Behrouz
    • Journal of Electrical Engineering and Technology
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    • v.5 no.3
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    • pp.415-422
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    • 2010
  • The distributed flexible alternative current transmission system (D-FACTS) is a recently developed FACTS technology. Distributed Static Series Compensator (DSSC) is one example of DFACTS devices. DSSC functions in the same way as a Static Synchronous Series Compensator (SSSC), but is smaller in size, lower in price, and possesses more capabilities. Likewise, DSSC lies in transmission lines in a distributed manner. In this work, we designed a fuzzy logic controller to use the DSSC for enhancing transient stability in a two-machine, two-area power system. The parameters of the fuzzy logic controller are varied widely by a suitable choice of membership function and parameters in the rule base. Simulation results demonstrate the effectiveness of the fuzzy controller for transient stability enhancement by DSSC.

A Dispatch Algorithm with Transient Stability Constraints by using Energy Margin (에너지 마진을 이용한 과도안정도 제약 급전 알고리즘)

  • Jung Yun-Jae;Chang Dong-Hwan;Chun Yeonghan
    • The Transactions of the Korean Institute of Electrical Engineers A
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    • v.55 no.1
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    • pp.1-6
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    • 2006
  • The emergence of competitive power market makes dispatch algorithm with transient stability constraints increasingly important for the transparent power system operation. Heuristic and off-line evaluation for the operation point can produce a discrimination among market players in the deregulated power system. In this paper, a dispatch algorithm with transient stability constraints is proposed. Energy margin under the TEF(Transient Energy Function) structure is adopted as a measure for the stability index. Implementation issues and simulation results are discussed in the context of a 10-bus system

Transient Stability Control of Power System using Passivity and Neural Network (시스템의 수동성과 신경망을 이용한 전력 시스템의 과도 안정도 제어)

  • Lee, Jung-Won;Lee, Yong-Ik;Shim, Duk-Sun
    • The Transactions of the Korean Institute of Electrical Engineers A
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    • v.48 no.8
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    • pp.1004-1013
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    • 1999
  • This paper considers the transient stability problem of power system. The power system model is given as interconnected system consisting of many machines which are described by swing equations. We design a transient stability controller using passivity and neural network. The structure of the neural network controller is derived using a filtered error/passivity approach. In general, a neural network cannot be guaranteed to be passive, but the weight tuning algorithm given here do guarantee desirable passivity properties of the neural network and hence of the closed-loop error system. Moreover proposed controller shows good robustness by simulation for uncertainties in parameters, which can not be shown in the speed gradient method proposed by Fradkov[3,7].

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Radial Basis Function Neural Network for Power System Transient Energy Margin Estimation

  • Karami, Ali
    • Journal of Electrical Engineering and Technology
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    • v.3 no.4
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    • pp.468-475
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    • 2008
  • This paper presents a method for estimating the transient stability status of the power system using radial basis function(RBF) neural network with a fast hybrid training approach. A normalized transient energy margin(${\Delta}V_n$) has been obtained by the potential energy boundary surface(PEBS) method along with a time-domain simulation technique, and is used as an output of the RBF neural network. The RBF neural network is then trained to map the operating conditions of the power system to the ${\Delta}V_n$, which provides a measure of the transient stability of the power system. The proposed approach has been successfully applied to the 10-machine 39-bus New England test system, and the results are given.

Optimization of Transient Stability Control Part-II: For Cases with Different Unstable Modes

  • Xue Yusheng;Li Wei;Hill David John
    • International Journal of Control, Automation, and Systems
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    • v.3 no.spc2
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    • pp.341-345
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    • 2005
  • Part-I of this two-part paper develops an optimal algorithm for transient stability control to coordinate the preventive actions and emergency actions for a subset of contingencies with an identical unstable mode. In this portion, several subsets of contingencies having dissimilar unstable modes are dealt with. Preventive actions benefiting a subset of contingencies may go against the stability of others, thus coordination among the optimal schemes for individual subsets is necessary. The coordination can be achieved by replacing some preventive actions with contingency-specified emergency actions. It is formulated as a classical model of economic dispatch with stability constraints and stability control costs. Such an optimal algorithm is proposed based on the algorithm in Part-I of the paper and is verified by simulations on a Chinese power system.

Enhancement of Power System Transient Stability and Power Quality Using a Novel Solid-state Fault Current Limiter

  • Fereidouni, A.R.;Vahidi, B.;Mehr, T. Hoseini;Doiran, M. Garmroodi
    • Journal of Electrical Engineering and Technology
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    • v.6 no.4
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    • pp.474-483
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    • 2011
  • Solid-state fault current limiters (SSFCL) in power systems are alternative devices to limit prospective short circuit currents from reaching lower levels. Fault current limiters (FCL) can be classified into two categories: R-type (resistive) FCLs and L-type (inductive) FCLs. L-type FCL uses an inductor to limit fault level and is more efficient in suppressing voltage drop during a fault. In contrast, R-type FCL is constructed with a resistance and is more effective in consuming the acceleration energy of generators during a fault. Both functions enhance the transient stability of the power system. In the present paper, a novel SSFCL is proposed to enhance power system transient stability and power quality. The proposed SSFCL uses both functions of an L-type and R-type FCL. SSFCL consists of four diodes, one self-turn-off IGCT, a current-limiting by-pass inductor (L), and a variable resistance parallel with an inductor for improvement of power system stability and prevention of over-voltage across SSFCL. The main advantages of the proposed SSFCL are the simplicity of its structure and control, low steady-state impedance, fast response, and the existence of R-type and Ltype impedances during the fault, all of which improve power system stability and power quality. Simulations are accomplished in PSCAD/EMTDC.