The Experts below are selected from a list of 113481 Experts worldwide ranked by ideXlab platform

Mao Qi-jing - One of the best experts on this subject based on the ideXlab platform.

  • Compensating Reactive Power Loss of Wind Farm With Reactive Power Generated by Wind Turbine Generators
    Power system technology, 2009
    Co-Authors: Mao Qi-jing
    Abstract:

    At present, the manner of Reactive Power compensation inside wind farms in China is to configure centralized Reactive Power compensators in wind farm collection stations, however such a compensation manner leads to high investment.Based on engineering example, by means of computing Reactive Power loss and voltage fluctuation of wind farm under various energy generation, it is pointed out that the Reactive Power balance of wind farm can be implemented by utilizing Reactive Power of wind turbine generators.The voltage fluctuation is the foundation by which the type selection of Reactive compensators is carried out.For wind farms where the bus voltage fluctuation due to the variation of energy generation does not exceed the specified voltage fluctuation range of Power grid, it is proposed that the Reactive Power generated by wind turbine generators should be utilized to reduce the capacity of Reactive Power compensators in wind farm collection station, thus the investment for Reactive Power compensation can be reduced.

T.l. Volkmann - One of the best experts on this subject based on the ideXlab platform.

  • Optimizing generator Reactive Power resources
    IEEE Transactions on Power Systems, 1999
    Co-Authors: M. M. Adibi, D.p. Milanicz, T.l. Volkmann
    Abstract:

    A method is described for selecting generator step-up and auxiliary transformer tap positions to provide the desired Reactive Power requirements in a coal burning Power plant. It is shown how a generator could be made to absorb Reactive Power, when previously unable to do so, by the adjustment of tap positions on the generator step-up and auxiliary transformers. The approach described provides an indication of the range of Reactive Power outputs that are available for different tap positions. This information would facilitate the alteration of transformer tap positions to make more effective use of generator Reactive Power resources.

A. Papalexopoulos - One of the best experts on this subject based on the ideXlab platform.

  • Reactive Power pricing and management
    IEEE Transactions on Power Systems, 1997
    Co-Authors: Shangyou Hao, A. Papalexopoulos
    Abstract:

    This paper explores the technical and economic issues of determining Reactive Power pricing structures in an open-access environment. It is believed that Reactive Power pricing and management under open-access will depend upon two important developments: (1) the functional unbundling of facilities that support the Reactive Power and voltage control service, and (2) grid rules to facilitate the coordination between generation and transmission systems for reliable system operation. The paper discusses the characteristics of Reactive Power that must be considered in order to develop a framework for Reactive Power pricing and management. Several cost allocation methods for valuing Reactive Power are presented. Two workable Reactive Power pricing structures are also proposed. The first is based on performance standards and the second is based on the local Reactive Power market concept.

Jin Zhong - One of the best experts on this subject based on the ideXlab platform.

  • Reactive Power as an Ancillary Service
    IEEE Transactions on Power Systems, 2001
    Co-Authors: Kankar Bhattacharya, Jin Zhong
    Abstract:

    This paper addresses the problem of Reactive Power procurement by an independent system operator (ISO) in deregulated electricity markets. A Reactive bid structure is proposed in the context of a Reactive Power market. Based on the Reactive Power price offers and technical constraints involved in Reactive Power planning, a two-tier approach is developed to determine the most beneficial Reactive Power contracts for the ISO. The Reactive capability of a generator and, therefore, the opportunity costs in providing Reactive Power is also included in the model. Uncertainty in Reactive demand and in Reactive bids of participating parties is incorporated through Monte Carlo simulations and the expected Reactive Power procurement plan for the ISO is hence determined. The CIGRE 32-bus network, approximately representing the Swedish system, is used for the studies.

  • Towards a competitive market for Reactive Power
    2003 IEEE Power Engineering Society General Meeting (IEEE Cat. No.03CH37491), 1
    Co-Authors: Jin Zhong, Kankar Bhattacharya
    Abstract:

    This paper presents the design of a competitive market for Reactive Power ancillary services. Generator Reactive Power capability characteristics are used to analyze the Reactive Power costs and subsequently to construct a bidding framework. The Reactive Power market is settled on uniform price auction, using a compromise programming approach based on a modified optimal Power flow model. The paper examines market Power issues in these markets and identifies locations where strategic market Power advantages are present that need to be removed through investments in Reactive Power devices.

Y.a. Alturki - One of the best experts on this subject based on the ideXlab platform.

  • Towards Reactive Power markets. Part 2 differentiated market Reactive Power requirements
    IET Generation Transmission & Distribution, 2008
    Co-Authors: Y.a. Alturki
    Abstract:

    Two major contributions are discussed in this part of a two-part set. first, it presents a new concept of market Reactive Power requirement (qreq) for every participant in both bilateral and pool markets. this qreq is defined as the Reactive Power loss allocation to each bilateral transaction using current adjustment factor (CAF) method that has been proposed in part 1. when a transaction is allowed to provide Reactive Power more than its qreq, it contributes to system Reactive Power needs and it is considered a Reactive Power provider. on the other hand, if it cannot produce its qreq, it relies on other Reactive Power sources to ship its contracted Power and it is considered a Reactive Power consumer even though it may generate some Reactive Power. the concept then is extended to participants in a pool market. secondly, this paper proposes a new general concept of differentiated Reactive Power requirements for every participant in electricity markets. it assumes that qreq of a participant depends on its allocated losses using any appropriate loss allocation method. the proposals help system operators and market participants to trade Reactive Power as well as real Power effectively and fairly. the simulation results show validity and consistency of the proposals.

  • Towards Reactive Power markets. Part 1: Reactive Power allocation
    IEE Proceedings - Generation Transmission and Distribution, 2006
    Co-Authors: Y.a. Alturki
    Abstract:

    Although real Power is the main traded commodity in electricity markets, Reactive Power plays a crucial role in Power systems reliability and security. In competitive electricity markets, no market participant wants to subsidise others in any way. Market participants utilise the network in different ways to maximise their profits. It means that their effects on the system, such as losses, can also be different. The development of a fair and accurate loss allocation scheme for real and Reactive Power is significant in avoiding cross subsidies and to have the correct charge for each participant. A new method is introduced to allocate real and Reactive Power losses in bilateral markets. The basic idea of the method assumes that transactions have their own effects on the system as well as their interactive effects with each other. Each transaction share of losses is based on its contribution to the system current flows. The proposed method determines these currents contributions and adjusts them, due to system nonlinearity, using the introduced current adjustment factors (CAFs). Unlike other approaches, the proposed method can effectively and easily allocate both real and Reactive Power losses simultaneously, which saves time and effort. It also determines the contribution of each transaction to every branch on the system. In addition, a new index, voltage participation index (VPI), is proposed to measure Reactive Power supports participation. This index is based on modified Y-bus matrix method proposed previously. The CAF method and VPI are illustrated using a simple three-bus system. Then they are verified on many systems, but due to space limit, only the results of IEEE 14- and IEEE 300-bus systems are presented. Results illustrate consistency with expectation. Part 2 will address the issue of how to price Reactive Power based on the technique developed in Part 1.