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检索条件"机构=Key Laboratory of Power Protection and Dynamic Security Monitoring and Control"

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Study on control Strategies to Improve the Stability of Multi-Infeed HVDC Systems Applying VSC-HVDC

Study on Control Strategies to Improve the Stability of Mult...

引用

Canadian Conference on Electrical and Computer Engineering (CCECE)

作者： Chengyong Zhao Ying Sun Key Laboratory ofPower System Protection and Dynamic Security Monitoring and Control under Ministryof Education North China Electric Power University Baoding Hebei China

Against the stability of the multi-infeed HVDC (MIDC) transmission system, voltage source converter based HVDC (VSC-HVDC) is applied to MIDC systems. The new systems can reduce probability of commutation failure and improve the stability of the MIDC systems. A physical model of a multi-infeed HVDC and VSC-HVDC system is developed, and its mathematical model is analyzed. The rectangular coordinate form of VSC's power transmission equations is deduced through coordinate conversion. Based on the inverse system method for multivariable nonlinear control, the nonlinear controllers of the multi-infeed HVDC and VSC-HVDC system are designed. Simulation results by PSCAD/EMTDC show that the designed nonlinear controllers improve effectively the voltage stability of the multi-infeed HVDC and VSC-HVDC system under small or large disturbances, such as short circuit fault, reduce the probability of commutation failure in the inverter of HVDC systems and increase the operation reliability of HVDC systems

关键词： control systems Stability HVDC transmission Converters power conversion Nonlinear control systems Mathematical model Voltage power system modeling power transmission

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A Hierarchical control Scheme for Transient Stability Augmentation by Thyristor controlled Braking Resistors

A Hierarchical Control Scheme for Transient Stability Augmen...

引用

International Conference on power System Technology (powerCON)

作者： X. Y. Zhang S. F. Huang Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control Ministry of Education North China Electric Power University China Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control (North China Electric Power University) Ministry of Education Si Fang Research Institute North China Electric Power University Beijing 102206 P.R. China. e-mail: huangsf@***

In this paper, a hierarchical control scheme for improving transient stability of power systems by thyristor controlled braking resistor is proposed. Based on three-level co- state prediction method of large-scale system principle, the control structure is organized into a two-layer controller. The lower layer is composed of decentralized local feedback controllers, each of which takes local feedback signal and controls its connected generator. In the upper layer a global controller is designed to enhance the effectiveness of decentralized local controllers. The global controller coordinates local controllers by generating remote feedback signals which ensuring the global optimal solution of the overall system transient performance. The proposed control scheme can guarantee fast and accurate control actions of local controllers when a power system is subjected to large disturbances. Simulation results show the effectiveness of the proposed control scheme.

关键词： Thyristors Resistors control systems power system transients power system stability power system control power systems Feedback Signal generators Optimal control

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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...

引用

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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Operation of a Three-phase Soft Phase Locked Loop Under Distorted Voltage Conditions Using Intelligent PI controller

Operation of a Three-phase Soft Phase Locked Loop Under Dist...

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IEEE Region 10 International Conference TENCON

作者： Guoliang Zhou Xinchun Shi Chao Fu Yi Wang Key Laboratory of Power System Protection and Dynaminc Security Monitoring and Control under Ministry of Education North China Electric Power University Baoding China

The phase angle of the utility voltage plays a most important role for the operation of FACTS (flexible AC transmission system) and renewable energy systems, and PLL (phase locked loop) should be accurate, fast and robust. Operation of a vector-based soft phase locked loop system under distorted utility conditions is presented in this paper. An intelligent PI controller is proposed to solve the conflict between tracing speed and filtering characteristics, which is to regulate the parameters of PI controller based on the phase error input. All analytical results are verified by simulations and experiments. The merits of high-speed, robust and strongly restraining ability to distorted voltage make it could be widely used in FACTS and renewable energy control systems

关键词： Phase locked loops Phase distortion Voltage control Flexible AC transmission systems Renewable energy resources Robustness Filtering Error correction Analytical models Robust control

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The Perturbed Trajectories Prediction Method Based on Wide-Area Measurement System

The Perturbed Trajectories Prediction Method Based on Wide-A...

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IEEE PES Transmission and Distribution Conference and Exposition

作者： Song Bi Li Yang Liu Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control Ministry of Education North China Electric Power University Beijing China North China Electric Power University Beijing Beijing CN Beijing Power Company in Beijing China

In this paper, a novel method for perturbed trajectory prediction of post-fault rotor angle is presented based on PMU (phasor measurement unit) measurements and trigonometric function curve fitting technique. A mathematical model about the relationship of post-fault rotor angle and time is derived from a speed-governing system model, which reveals that the perturbed trajectory of the post-fault rotor angle can be expressed by trigonometric functions. By curve fitting technique, a least square method to predict the perturbed trajectory using trigonometric function is proposed. Numerical simulations are conducted on IEEE 9-bus system to test the effectiveness of this method. The proposed method can give more reasonable and more promising prediction results as compared with polynomial curve fitting technique

关键词： Trajectory Prediction methods Wide area measurements Curve fitting Phasor measurement units Mathematical model Measurement units Least squares methods Numerical simulation System testing

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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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Research of Multi-Farms Transmission of Distributed Generation Based on HVDC Light

Research of Multi-Farms Transmission of Distributed Generati...

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International Conference on power System Technology (powerCON)

作者： Z.r. Zhang Z.d. Yin 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

Nowadays worldwide, distributed generation plays a more and more important role in world's energy supply system. But distributed resources' innate weaknesses cause some problems such as wavy output power and instability of power generation. These innate weaknesses are hard to overcome only through improving one single distributed generation plant or adding energy storage equipment etc. In this article, a new concept of connecting several AC distributed generation plants (such as wind farm) via VSC-converter, and DC distributed generation plants (such as solar cell) via DC/DC converter and forming a low voltage DC network is given. This low DC network will be integrated into AC grid in some proper way. Namely equalize these small distributed generation plants to a big power generation farm to improve stability of electricity generation. Some simulations based on PSCAD/EMTDC are also given.

关键词： Distributed control HVDC transmission Distributed power generation Solar power generation power generation Wind energy generation Wind power generation Energy storage Joining processes Wind farms

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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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An Alternative Approach for Coordinating Dispatching Day-Ahead and Real-Time Energy Markets

An Alternative Approach for Coordinating Dispatching Day-Ahe...

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IEEE PES power Systems Conference and Exposition, PSCE

作者： Gengyin Li Ming Zhou Bo Liu Guoli 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 Department of Applied Mathematics North China Electric Power University Baoding Hebei China

The paper investigates the features of separately clearing the energy in the day-ahead market and then doing the same for the real-time market from the system operator's perspective. The analysis will show that this separate clearing mechanism is not always the most economical. An alternative approach based on co-optimization of both energy markets is presented. Considering stochastic electric demand, a novel integrated energy dispatching model (IEDM) is proposed for system operators that schedules day-ahead energy trading taking possible real-time demand and prices into account to find an optimal day-ahead dispatching scheme so as to achieve the total purchase cost minimum. Mathematical analysis is provided to illustrate the IEDM is more economical than the conventional separate dispatching approach. The IEDM solution integrates Monte Carlo simulation and linear programming with Hooke and Jeeves pattern search method. A 6-unit system example is applied to illustrate that the IEDM provides a more economical approach

关键词： Dispatching Economic forecasting Real time systems power generation economics Fluctuations Job shop scheduling power markets power system economics power system planning Frequency

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A Novel Adaptive Algorithm to Identify Inrush Using Mathematical Morphology

A Novel Adaptive Algorithm to Identify Inrush Using Mathemat...

引用

IEEE PES power Systems Conference and Exposition, PSCE

作者： Ma Jing Wang Zengping Xu Yan Wu Jie Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control under Ministry of Education North China Electric Power University Baoding Hebei China School of Electrical and Engineering North China Electric Power University Baoding Hebei China

A novel scheme based on mathematical morphology to distinguish the inrush current from the internal fault current in power transformers is proposed, which is derived from high non-linearity in exciting cores of transformers. Transient current signals are extracted by use of the novel morphological gradient and morphological opening and closing transform, meanwhile various kinds of additive white noises are effectively suppressed by adaptive filtering. Based on different characteristics of transients between the short circuit current and the inrush current, the transformer criterion is developed. The proposed technique is immune to CT saturation. A total of 120 Electrical power dynamic laboratory (EPDL) simulation cases are used to test the performance of the technique. This method has stability during the symmetrical inrush current and can be implemented in real time with very high accuracy. The results of different EPDL testing systems verify the feasibility and practicability of the proposed scheme

关键词： Adaptive algorithm Surges Morphology Fault currents power transformers Transformer cores Additive white noise Adaptive filters Short circuit currents Circuit faults

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