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共 259 条记录，以下是211-220 订阅

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Study on Conjectural Variation Based Bidding Strategy in Spinning Reserve Markets

Study on Conjectural Variation Based Bidding Strategy in Spi...

引用

International Conference on power system Technology (powerCON)

作者： Xudong Jia Ming Zhou Gengyin Li Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control under Ministry of Education North China Electric Power University Baoding Hebei China

In this paper, a novel model of opportunity cost of spinning reserve capacity is proposed based on sequential dispatching. A model of strategic behaviors of generation firms based on conjectural variation is proposed to apply in monopoly spinning reserve capacity markets with incomplete information. According to the conjectural variation model, each firm rationally maximizes its profits while considering reactions of their competitors. The advantage of this method over others is that it is a real reflection of actual power markets without the need to know all firms' actual costs. Examples are used to illustrate that the proposed model is logical and practical.

关键词： Spinning Costs Dispatching Monopoly power markets power generation educational programs power system simulation Reflection monitoring

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Modeling of VSC-HVDC and control strategies for supplying both active and passive systems

Modeling of VSC-HVDC and control strategies for supplying bo...

引用

IEEE General Meeting power& Energy Society

作者： Gengyin Li Ming Yin Ming Zhou Chenyong Zhao Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control under Ministry of Education North China Electric Power University Baoding Hebei China

An equivalent continuous-time state-space model for VSC-HVDC in the synchronous dq reference frame has been established in the paper. Based on the model, relevant control strategies have been developed for the cases of supplying active and passive systems. The multi-input multi-output (MIMO) control schemes are emphasized in designing power controller and voltage controller. The scheme features feed forward compensation to decouple the d- and q-axis of the voltage source converter (VSC) model, which ensures the independent control of active and reactive power, DC voltage and reactive power as well. Simulations have been performed on PSCAD/EMTDC, a visual design environment for power system studies. The validity of the mathematic model and the feasibility of the control strategies have been proved by the simulation results

关键词： power system modeling Voltage control Converters power conversion power system simulation Reactive power control PSCAD MIMO Feeds EMTDC

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Optimal Allocation of Electromagnetic Pollution Emission Rights in power Quality Markets

Optimal Allocation of Electromagnetic Pollution Emission Rig...

引用

International Conference on power system Technology (powerCON)

作者： Xiaodong Yang Gengyin Li Ming Zhou Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control under Ministry of Education North China Electric Power University Baoding Hebei China

power quality (PQ) is an issue that is becoming increasingly important to electricity consumption. How to design a market mechanism for power quality exchange becomes acute more and more. Due to its systematic property, a managed power quality market (PQM) should be organized. In this paper, a novel competing model involving two-price bidding of demand side and marginal cost bidding of supply side is presented to optimize the allocation of emission right (ER) among the consumers in a managed PQM. The uniform price for the basic emission capacity can help to reduce the risks in markets, and the ultimate allocation can maximize the total system utility because the trading between suppliers and consumers occurs at the point of market equilibrium. An example is given to illustrate the rationality and feasibility of the proposed model.

关键词： Pollution power quality power system management Energy consumption Energy management Load management Quality management power system modeling Cost function Erbium

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Sequential Monte Carlo Simulation Based Available Transfer Capability Calculation

Sequential Monte Carlo Simulation Based Available Transfer C...

引用

International Conference on power system Technology (powerCON)

作者： Yajing Gao Ming Zhou Gengyin Li Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control under Ministry of Education North China Electric Power University Baoding Hebei China

Available transmission capability (ATC) is the transfer capability remaining in physical transmission network for further commercial activity above existing transmission commitments. ATC is an important reference for market participators to make decisions, as well as a judgment for system operators to alleviate transmission congestion, and a reference for system planning and expansion. Most of the existing ATC calculation methods are mainly based on deterministic techniques. In practical power systems, there are large amount of uncertainties, and power system is dynamic and time-varying. A novel approach is proposed to analyze relevant features of ATC and calculate ATC based on sequential Monte Carlo simulation and linear programming considering uncertainties and time variation of the system. Through long-time simulation and analysis, the distribution features of ATC can be obtained. The algorithm based on MATlab 6.5 is developed. IEEE 14-bus test system is used to verify the presented approach.

关键词： power system planning power system simulation power system dynamics power system analysis computing Uncertainty Time varying systems Linear programming Analytical models MATlab system testing

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Active-reactive power compensation based on SCES in distribution system

Active-reactive power compensation based on SCES in distribu...

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International Conference on power system Technology (powerCON)

作者： Rong Lu Jiancheng Zhang Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control under Ministry of Education North China Electric Power University Baoding Hebei China

A Super Capacitor Energy Storage (SCES) system applied to distributed generation system and distribution network is presented. Application studies of the SCES system for active power supply, voltage control and harmonic elimination are described. With inverter control, both active and reactive power pumped into the utility grid can be controlled. The proposed approach combines a dual-loop voltage and current control and a power control which does not require knowledge of the equivalent impedance of the utility grid the SCES unit is connected to. Furthermore, the proposed power control has superiorities as strong P and Q regulation capability, fast enough response, and purely sinusoidal line current. Finally, experiments are performed to verify the proposed theory which shows its well performances.

关键词： power control Capacitors Energy storage Distributed control power supplies Voltage control power system harmonics Inverters Reactive power control Current control

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Research on dynamic characteristics of VSC-HVDC system

Research on dynamic characteristics of VSC-HVDC system

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IEEE General Meeting power& Energy Society

作者： Guangkai Li Gengyin Li Haifeng Liang Chengyong Zhao Ming Yin Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control under Ministry of Education North China Electric Power University Baoding Hebei China

VSC-HVDC technology based on voltage source converter (VSC) and isolated gate bipolar transistor is a kind of novel HVDC technology for low power and long distance with flexible control and operation modes. In this paper, the dynamic mathematic model of VSC-HVDC with SPWM control is founded based on analyzing the fundamental principle of VSC-HVDC system. Its switch characteristic and dynamic operation mechanism are analyzed. Simulation results of dynamic operation characteristics for VSC-HVDC system with a rapid power change or a short time fault show that the theoretical analysis is correct. This is a basement to do more dynamic analysis for VSC-HVDC

关键词： Converters power conversion Isolation technology Switches Bipolar transistors HVDC transmission Voltage control Mathematics Mathematical model power system modeling

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Novel method for disturbance identification in power systems

Novel method for disturbance identification in power systems

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IEEE General Meeting power& Energy Society

作者： T.S. Bi X.N. Song J.T. Wu Q.X. Yang Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control under Ministry of Education North China Electric Power University Beijing China Sifang Protection and Control Company Limited Beijing China

With the development of power grid interconnection, it is necessary for operators to know about system dynamic status while disturbance occurs in power systems in order to take appropriate counter measures to ensure the power system security. The advent of wide area measurement system (WAMS) makes the monitoring of power system dynamic behavior become possible. Based on WAMS, a method for identifying different kinds of disturbance in power system is presented in this paper. Firstly, the features of disturbances (i.e. short circuit, load shedding and loss of generation) that frequently occur in power system are analyzed in detail. Then, based on the idea of pattern recognition, the suggested disturbance identification method is discussed. Finally, computer simulation results are carried out in North China power grid, which demonstrate the validity of theoretical analysis and the feasibility of the proposed disturbances identification method

关键词： power systems power system dynamics power system measurements power system security power system interconnection power grids Wide area measurements power system analysis computing power system simulation Integrated circuit interconnections

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Study on the control of DFIG and its responses to grid disturbances

Study on the control of DFIG and its responses to grid distu...

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IEEE General Meeting power& Energy Society

作者： Ming Yin Gengyin Li Ming Zhou Guoping Liu Chengyong Zhao Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control under Ministry of Education North China Electric Power University Baoding Hebei China Shijiazhuang Electricity Company Shijiazhuang Hebei China

The paper presents the dynamic model of doubly fed induction generator (DFIG) including the mechanical model, the generator model and the PWM voltage source converter model. The mechanical model uses two-mass model, and the generator model includes both the stator side and the rotor side dynamics. The PWM voltage source converter is modeled as an average model in which the action of power electronic switches is neglected. The paper features vector control of DFIG. On the rotor side converter, the control scheme enables the independent control of speed and reactive power from the stator. On the grid side converter, the control scheme is implemented to regulate the DC voltage and reactive power from the grid as well. In order to study the influence of the grid disturbances on the DFIG, grid voltage dip and quick frequency change are simulated with the engineering software, MATlab/Simulink. Meanwhile, in the paper the pole-placement method and internal model control method are implemented for designing the PI controllers

关键词： Mathematical model Induction generators Pulse width modulation Pulse width modulation converters Voltage Stators Rotors Reactive power control Switching converters power electronics

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Study on Energy-saving Strategies for dynamic Voltage Restorer

Study on Energy-saving Strategies for Dynamic Voltage Restor...

引用

International Conference on power system Technology (powerCON)

作者： L.x. Zhi Z.d. Yin H. Ding J.b. Han F.x. Hu Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control under Ministry of Education North China Electric Power University Beijing China Power Dispatching and Communication Center China Southern Power Grid Company Limited GuangZhou China

Traditional voltage injection methods for DVR are in-phase strategy which injects voltage in phase with the sag voltage and missing voltage technique which compensates for the difference between the sag and pre-sag voltages. Since a certain component of injected voltage is in-phase with the load current, DVR has to provide some amount of energy to the grid. This paper use DQ analyzing method based on instantaneous reactive power theories to detect and obtain the parameters of source side voltage for balanced faults of three-phase three-wire system. Through circumgyrating the phasor and injecting voltage with an appropriate advance phase relative to source side voltage, the minimum energy injection can be achieved. For unbalanced faults, fictitious three-phase voltages which come from a single- phase source can be constructed mathematically, so unbalanced faults can be dealt with easily in a balanced way. Simulation results are presented to demonstrate the validity of the proposed method.

关键词： Voltage fluctuations Uninterruptible power systems Voltage control power system restoration power system dynamics control systems Reactive power Fault detection Costs Energy management

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Fast Prediction of Loadability Margins by Constructing a Small-Signal Stability Boundary Based on Neural Networks

Fast Prediction of Loadability Margins by Constructing a Sma...

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International Conference on power system Technology (powerCON)

作者： Xueping Gu Claudio A. Canizares Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control under Ministry of Education North China Electric Power University Baoding Hebei China Department of Electrical and Computer Engineering University of Waterloo Waterloo ONT Canada

Determining loadability margins to various security limits is of great importance for the secure operation of a power system. A novel approach is proposed in this paper for fast prediction of loadability margins with respect to small-signal stability based on neural networks. Small-signal stability boundaries are constructed by means of loading the power system until the stability limits are reached from a base operating point along various loading directions. Back-propagation neural networks (BPNN) for different contingencies are trained to approximate these stability boundaries. A search algorithm is then proposed to predict the loadability margins from any stable operating point along arbitrary loading directions through an iterative technique based on the trained BPNNs. The simulation results for the IEEE two-area benchmark system demonstrate the effectiveness of the proposed method for on-line prediction of loadability margins.

关键词： Neural networks power system stability power system security Voltage power system simulation monitoring National security control systems Operating systems Bifurcation

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