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A novel HVDC transmission system with parallel large capacitor connected in the DC side of the rectifier and its technical feasibility

A novel HVDC transmission system with parallel large capacit...

引用

2005 IEEE/PES Transmission and DistributionConference and Exhibition - Asia and Pacific

作者： Zhao, Chengyong Cui, Haibo Li, Gengyin IEEE Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control Ministry of Education North China Electric Power University Baoding 071003 Hebei Provinece China

ISBN: (纸本)0780391144

In this paper, a novel HVDC transmission system is presented which is with parallel large capacitor connected in the DC side of the rectifier (shorted form HVDC-C). The fundamental principle and technology characteristics of HVDC-C are analyzed. The study shows that HVDC-C reduces the component of harmonic voltage and harmonic current both side in AC system and DC transmission line, makes control strategy more flexible and the filter structure more simple, etc. Furthermore, the control method, contrast to conventional HVDC and application foreground of HVDC-C is discussed briefly. The simulations based on PSCAD/EMTDC show that HVDC-C can operate steadily, has the capability to restore steadily when short circuit fault occurs, and is feasible technically and obvious in advantages. © 2005 IEEE.

关键词： HVDC power transmission

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Study on the influence of TCSC on fault component distance protection

Study on the influence of TCSC on fault component distance p...

引用

2005 IEEE/PES Transmission and Distribution Conference and Exhibition: Asia and Pacific

作者： Liu, Qing Wang, Zengping Xu, Yan IEEE Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control Ministry of Education North China Electric Power University Baoding City Heibei Province China

ISBN: (纸本)0780391144

Based on the characteristics of TCSC, the influence of TCSC on fault component distance protection is analyzed. With the new setting resistance to be ZZd-jXc, the action of fault component distance protection on the line equipped with TCSC is presented. It is concluded that the fault component distance protection will not act incorrectly, but the range of protection will be reduced, especially when the TCSC is bypassed. © 2005 IEEE.

关键词： Electric power transmission

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Analysis and design of H∞ controller in VSC-HVDC systems

Analysis and design of H∞ controller in VSC-HVDC systems

引用

2005 IEEE/PES Transmission and DistributionConference and Exhibition - Asia and Pacific

作者： Liang, Haifeng Li, Gengyin Li, Guangkai Li, Peng Yin, Ming IEEE Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control Ministry of Education North China Electric Power University Baoding 071003 Hebei Province China

ISBN: (纸本)0780391144

Through the analysis on voltage source converter (VSC) equations in dq0 coordinate system, the state space equation of the generalized plant is gained. By use of H∞ theory, constant DC voltage H∞ controller and constant AC voltage controller are designed. On the basis of establishing MATLAB simulation model for transmitting power to passive network via VSC-HVDC system, the simulation of control modes, such as constant DC voltage control, constant AC voltage control and constant reactive power control, is conducted. Simulation results show that the proposed controller can meet the need of supplying power to passive network and the control modes are effective. © 2005 IEEE.

关键词： Electric converters

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Analysis and control of wind farm incorporated VSC-HVDC in unbalanced conditions

Analysis and control of wind farm incorporated VSC-HVDC in u...

引用

2005 IEEE/PES Transmission and Distribution Conference and Exhibition: Asia and Pacific

作者： Yin, Ming Li, Gengyin Zhou, Ming Liu, Yong IEEE Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control Ministry of Education North China Electric Power University Baoding 071003 Hebei Province China

ISBN: (纸本)0780391144

With increasing attention to sustainable development and environmental protection, more and more countries turn to wind energy to reduce their dependence on traditional fossil fuel energy. Among the new challenges with this trend is how to integrate wind farm with existing ac network more effectively. The paper presents a possible measure based on VSC-HVDC, namely so-called wind farm incorporated VSC-HVDC (WVSC-HVDC). In the paper the wind farm along with an ac grid supplies to a passive network. The paper firstly introduces VSC-HVDC, and then presents a space vector based control strategy for supplying to a passive network. The rectifier controls dc voltage and reactive power that is needed by the wind farm. The inverter controls the ac bus voltage in the passive network. Simulations using PSCAD/EMTDC are performed to study the steady and transient behaviors of WVSC-HVDC. With harmonics analysis, the simulation results will be helpful for further understanding of the operation characteristics of WVSC-HVDC and its protection design. © 2005 IEEE.

关键词： HVDC power transmission

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The similitude power detection on single-phase-to-ground fault in the non-solidly grounded system

The similitude power detection on single-phase-to-ground fau...

引用

2005 IEEE/PES Transmission and DistributionConference and Exhibition - Asia and Pacific

作者： Zhao, Chengyong Guo, Yanfen Li, Gengyin IEEE Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control Ministry of Education North China Electric Power University Baoding 071003. Hebei Provinece China

ISBN: (纸本)0780391144

Detecting single-phase-to-ground fault is a difficult and challenging problem in the non-solidly grounded system that includes neutral point ungrounded, neutral point high-resistance grounded and neutral point compensated extinction coil grounded system. It is important to identify the faulted line quickly and exactly to reduce the time and effort necessary to locate and remove the fault, so that the probability of a second ground fault with its destructive currents can be reduced significantly. Based on analyzing the characteristics of the existing methods about identifying the faulted line in the non-solidly grounded system, the characteristics of the lines' zero-sequence current and the system's zero-sequence voltage and the relationship between every line's zero-sequence current and the system's zero-sequence voltage are analyzed deeply and a new method using similitude power to determine the faulted line is presented. The method can be applied to neutral point ungrounded system and neutral point ineffective grounded system to determine the faulted line accurately when resistance ground faults occur. Various ground faults under different conditions are simulated using MATLAB. The results show the method is feasible and effective. © 2005 IEEE.

关键词： Electric fault currents

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Project study of dynamic voltage restorer

Project study of dynamic voltage restorer

引用

2005 IEEE/PES Transmission and Distribution Conference and Exhibition: Asia and Pacific

作者： Yin, Zhongdong Han, Minxiao Zhou, Lixia Yu, Kunshan Key Laboratory of Power System Protection and Dynamic Securty Monitoring and Control Ministry of Education China Electric Power Research Institute Beijing China

ISBN: (纸本)0780391144

The paper studies a practical project of 2MVA dynamic Voltage Restorer on the basis of transformer-less cascade multilevel topology, it discusses each part working principle of DVR, but also provides a practical voltage sag problem solving scheme for a 6kV feed line based on proposed cascade structure. EMTDC/PSCAD based simulation results verify the validity of proposed scheme. © 2005 IEEE.

关键词： Voltage control

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Multiagent and WAN based adaptive coordinated protection system

Multiagent and WAN based adaptive coordinated protection sys...

引用

2005 IEEE/PES Transmission and Distribution Conference and Exhibition: Asia and Pacific

作者： Song, Shaoqun Zhu, Yongli Huang, Min Yu, Hong Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control Ministry of Education North China Electric Power University Baoding China North China Electric Power University Baoding China

ISBN: (纸本)0780391144

This paper presents a Multi-Agent and WAN Based Adaptive Coordinated protection system (MAWBACPS). The system utilizes IP Intranet to realize real-time wide area information exchange of a power system. Multi-agent system's several good qualities to solve distributing problems are used to realize the coordination of the operation settings of protective relays. A new idea of effortful adaptation for power system protection is proposed, and a new method to determine adaptive coordinated relay settings of lines are proposed in this paper. Moreover, the structure, communication mechanism and coordination control strategy of MAWBACPS, and relating agents' design are presented. Experiment results illustrate that MAWBACPS can realize the coordination of protections, enable the back-up relays to use their adaptive settings in most situations, and efficiently improve the security of power system. © 2005 IEEE.

关键词： Electric power transmission networks

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Risk management on long-term electricity purchase allocation in China power markets

Risk management on long-term electricity purchase allocation...

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Sixth International Conference on power Electronics and Drive systems, PEDS 2005

作者： Zhou, Ming Li, Gengyin Nie, Yanli Ni, Yixin Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control under Ministry of Education North China Electric Power University Baoding 071003 Hebei Province China Department of Electrical and Electronic Engineering University of Hong Kong Hong Kong Hong Kong

ISBN: (纸本)0780392965

This paper presents an integrated framework for the optimal management of electricity purchase allocation and risk for load service entities (LSEs). To the practice of China power Markets, we propose the framework of power portfolio of combined physical forward contract and spot market. The framework suggests that the forward contracts should have different prices on-peak and off-peak in accord with sale prices distinguish on-peak and off-peak. The optimal purchase problem is described by the utility maximum integrated the rate of return and risk tolerance level, and risk is evaluated by Value at Risk (VaR). The analytical solution is also conducted. The numerical results are reasonable with higher rate of return and better risk hedging compared with the corresponding results from the existing portfolio selection approach. The presented framework gives one possible and effective method for the optimal power portfolio and risk management in incomplete power markets. © 2005 IEEE.

关键词： Risk management

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Environmental/economic transaction planning using multiobjective particle swarm optimization and non-stationary multi- Stage assignment penalty function

Environmental/economic transaction planning using multiobjec...

引用

2005 IEEE/PES Transmission and Distribution Conference and Exhibition: Asia and Pacific

作者： Ma, Rui Wang, Peng Yang, Huachun Hu, Guoqiang Changsha Science and Technology University Changsha China Key Laboratory of Power System Protection and Dynamic Securty Monitoring and Control Ministry of Education Beijing China

ISBN: (纸本)0780391144

This paper presents a new approach for Environmental/Economic transaction planning model of the electricity market. The Environmental/Economic transaction planning problem is formulated as a multi-objective optimal power flow (MOPF) problem. A novel algorithm using multiobjective Particle Swarm Optimization (MOPSO) and non-stationary multi-stage assignment penalty function is proposed to solve this problem. PSO is modified by using dynamic neighborhood strategy, new particle memory updating, and one-dimension optimization to deal with multiple objectives. Incorporating of non-stationary multi-stage assignment penalty function in solving OPF problem can improve the convergence. The proposed method is demonstrated on the IEEE 30-bus system. The results show that the proposed approach can efficiently gain multiple pareto optimal transaction planning that match with the sustainable development strategy. © 2000 IEEE.

关键词： Strategic planning

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Decomposition on pollution current of load emitting and analysis of its influence on power price

Decomposition on pollution current of load emitting and anal...

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2005 IEEE/PES Transmission and DistributionConference and Exhibition - Asia and Pacific

作者： Jia, Xiufang Zhao, Chengyong Suo, Juan Li, Gengyin IEEE Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control Ministry of Education North China Electric Power University Baoding 071003 Hebei Provinece China NCEPU School of Electrical Engineering NCEPU

ISBN: (纸本)0780391144

Along with the increment of disturbing loads in the power system, the effect on network that is brought by the power quality problems, become increasingly serious. Based on the market bargaining principles, the power price should be affected by the disturbance of loads. However current power price system fails to reflect the factor. Evaluation of load's disturbing property and analysis of its influence to power price is performed in this paper. The load current can be decomposed into three parts: instantaneous active current, instantaneous fundamental reactive current and instantaneous distorted current by the generalized instantaneous reactive power theory in dq0 coordinate system. The reactive current emission factor reflecting pure resistance of load and distorted current emission factor reflecting load's linearity are defined. According to these two factors, the evaluation method of the effect of the disturbing load on the power price based on allocating compensation equipment's cost is presented. The method provides some basis for contract's subscribing in the future. The calculated example shows the feasibility of above method, as well the degree of the influence of the disturbing load upon the power price. © 2005 IEEE.

关键词： Electric loads

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