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

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Comparison of Transient Stability between Wind Farm Based on DFIG and Traditional power Plant in an Actual Grid

Comparison of Transient Stability between Wind Farm Based on...

引用

IEEE PES Asia-Pacific power and Energy Engineering Conference (APPEEC)

作者： Hongjing Hou Li Lin Tao Wu Youzhong Miao Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control North China Electric Power University Beijing China North China Electric Power Research Institute Company Limited Beijing China

As a clean renewable energy, wind energy draws more and more attention around the world. In case of high wind speed or low speed but substantial installed wind power capacity, wind turbine generators (WTGs) will take the place of traditional power plant partly. Under the circumstance, the transient stability will change. Therefore, in this article, the synthetical dynamic model of WTG is introduced first, and on the basis of it, the article focus on the comparison of transient stability characteristic between wind farm based on double fed induction generator (DFIG) and tradition power plant with the same capacity. Take an actual grid including wind farm as an example. The power factor of the wind farm is 1.00 and keeps constant during steady state. Under this control mode, the reactive power between wind farm and the grid is zero. The study indicates that, in this system, when the scale of wind farm connected is below 12.3%, the transient stability is better than synchronous generator integrated with the identical capacity. And with the increasing capacity of wind farm, the fault critical clearing time (CCT) is shorter, and it lasts longer time during the recovery. When the scale of wind farm exceeds 12.3%, the terminal voltage of point of common coupling (PCC) is below 0.95 p.u. The stability is inferior to the synchronous generator connected. Under the circumstance, the stability will be enhanced through adding the reactive power compensative device.

关键词： Stability Wind farms power generation Wind energy Reactive power Synchronous generators Renewable energy resources Wind speed Wind turbines Wind energy generation

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A scheme of connecting microgird to AC grid via flexible power electronics interface

A scheme of connecting microgird to AC grid via flexible pow...

引用

International Conference on power system Technology (powerCON)

作者： Wei Yue Chengyong Zhao Yi Lu Gang Li Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control under Ministry of Education North China Electric Power University Beijing China Electric Power Research Institute of Zhejiang Hangzhou China

Based on the synthetic control of microgrid, a flexible power electronics interface is developed in this paper. Considering distributed generation types and storage devices, different control strategies are adopted in controller design for different distributed generation units. The interface comprises a couple of back-to-back VSC converters, and exports variable active power and reactive power in order to maintain the power balance inside the microgrid. Apparently, the interface separates the microgird from the AC grid, prevent harmonic component transmitting from one side to the other side and control the active power precisely flowing between microgrid and main grid. Besides, it's also in charge of reactive power compensation and keeping the microgrid voltage stable. Simulation results can approve its superiority and validity comparing with direct connection.

关键词： Joining processes Reactive power Voltage control Converters Inverters Distributed power generation

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Compound control algorithm based on a novel topology of current compensation apparatus

Compound control algorithm based on a novel topology of curr...

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International Conference on Critical Infrastructures, CRIS

作者： Liu Yukun Xiao Xiangning Lei Xiao Wang Xiangxu Wang Jin Key Laboratory of Power Protection and Dynamic Security Monitoring and Control of Ministry of Education North China Electric Power University Beijing P.R.China

ISBN: (纸本)9781424480807

This paper theoretically analyzes the compound control apparatus for current quality compensation which is designed as differentiation cascaded H bridge type with two modules: fundamental-frequency module and high-frequency module. The detection algorithm calculates the harmonic current and fundamental-frequency current of the load current which serve as the command current. For the purpose of eliminating the steady periodic error of system and improving the tracking accuracy of the compensation current, PI and repetitive controller in parallel is introduced as a advanced current control method. A detailed analysis and design for the high-frequency module is presented based on frequency characteristic and steady state. A 10kV system simulation model based on PSCAD/EMTDC is built to analyze the control strategy. Finally, the experimental results illustrate that the proposed control strategy is feasible and provide a reference for the 10kV industrial apparatus.

关键词： Harmonic analysis power harmonic filters Load modeling Switching frequency Compounds

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An adaptive distance protection scheme for distribution system with distributed generation

An adaptive distance protection scheme for distribution syst...

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International Conference on Critical Infrastructures, CRIS

作者： Jing Ma Jinlong Li Zengping Wang Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control under Ministry of Education North China Electric Power University Beijing China Chengdu Electric Power Bureau Chengdu Sichuan China

ISBN: (纸本)9781424480807

The value setting of the traditional distance protection has become very difficult for the distribution system with distributed generators (DGs) owing to the randomness of the DG output power. This paper proposes a new adaptive distance protection scheme to solve this problem. Firstly, on the basis of the connected point of DGs, the protected feeders are divided into different zones, with adaptive distance protection configured at the upstream side of DG. Then, based on a fault characteristic analysis of the distribution system with DG, the adaptive distance protection scheme for the distribution system with DG is studied to solve this problem. The results show that this scheme can automatically calculate the settings according to the operation mode and the output power of DG with no need for communication. Compared with the traditional adaptive protection scheme, the performance of this method is greatly improved. Simulation results on a 10 kV distribution system have verified the validity of the scheme proposed.

关键词： Relays power systems Adaptive systems Sensitivity Simulation Impedance Distributed power generation

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A new tracking algorithm of substation configuration based on the general multiplication and general addition operations

A new tracking algorithm of substation configuration based o...

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International Conference on power system Technology (powerCON)

作者： Jinfang Zhang Zengping Wang Yagang Zhang Jing Ma Key Laboratory of Power System Protection and Dynamic Security Monitoringand Control under Ministry of Education North China Electric Power University Beijing China

The topology characteristics of the nodal matrix in power system analysis and the adjacent matrix in graph respectively has been proved to be absolutely identical. According to this feature and modification principles of the nodal impedance matrix, a new tracking algorithm for the state change of the circuit breaker has been built based on the general multiplication and general addition operations. The new algorithm is able to reduce the computation burden than the traditional way. Finally, the text example has validated the efficiency of the novel tracking algorithm in substation configuration.

关键词： Matrix decomposition Substations Analytical models

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A study of transient-based protection using wavelet energy entropy for power system EHV transmission line

A study of transient-based protection using wavelet energy e...

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International Conference on Wavelet Analysis and Pattern Recognition (ICWAPR)

作者： Ming-Yu Yang Yu-Kun Yang Key Laboratory of Power System Protection Dynamic Security Monitoring and Contro1 under Ministry of Education North China Electric Power University Baoding China

Wavelet energy entropy has a small calculation amount, and it has a unique sensibility to slightly change of the dynamic system parameters. This paper presents a novel transient-based protection for power system EHV transmission line, which employ the value of wavelet energy entropy to reflect the different energy distribution between internal and external fault. The basic principle of the protection is according to the attenuation effect of busbar capacitance and line trap to the high-frequency components. Simulation results show that the proposed protection criterion has high sensitivity and reliability, and capable of providing correct responses under conditions of different fault types, positions, path resistances, and inception angles.

关键词： Wavelet transforms Entropy Wavelet analysis Transient analysis power transmission lines

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Study and Simulation of VSC-HVDC under AC power system Faults

Study and Simulation of VSC-HVDC under AC Power System Fault...

引用

International Conference on Critical Infrastructures, CRIS

作者： Wei Yue Chengyong Zhao Yi Lu Gang Li Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control under Ministry of Education North China Electric Power University Beijing China Zhejiang Electric Power Test and Research Institute Hangzhou China

ISBN: (纸本)9781424480807

In this paper, control strategies of VSC-HVDC aiming to improve the ability of fault ride through of the VSC-HVDC system under serious asymmetric fault at the receiving side was studied. On the basis of DQ decoupling control scheme, two additional fault control modules are proposed based on positive and negative sequence detecting technology. One is based on negative sequence voltage compensation, and the other is based on oscillating active power elimination. Simulations are carried out in PSCAD/EMTDC to verify the validity of the proposed control strategies.

关键词： power conversion Voltage control HVDC transmission Inverters Steady-state

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Comparison and Conversion of dynamic Models of Speed Governor for Transient Stability Analysis in BPA and PSS/E

Comparison and Conversion of Dynamic Models of Speed Governo...

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IEEE PES Asia-Pacific power and Energy Engineering Conference (APPEEC)

作者： Li Lin Kun Zhang Feng Sun Qunju Li 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 Research Institute Company Limited Beijing China

In the paper, the principle of speed governor of synchronous machine is discussed firstly. Based on this, mathematical models of the speed governors of BPA and PSS/E are compared to find the corresponding relationship of the speed governor models between BPA and PSS/E. The corresponding models have been validated by simulation of a single machine infinite bus system and the quantitative analysis of conversion error between models is given. The results indicate that the corresponding speed-governor models of BPA and PSS/E have good consistency, so conversion of corresponding speed-governor models between BPA and PSS/E can be entirely achieved for transient stability analysis.

关键词： Transient analysis Stability analysis power system modeling power system simulation power system dynamics PSCAD power system transients Analytical models power system planning power system analysis computing

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A droop control method of microsources based on divided self-adjusting slope coefficient

A droop control method of microsources based on divided self...

引用

International Conference on power system Technology (powerCON)

作者： Peng Li Wei Wang Xilei Yang Shuai Wang Hongfen Cui Changzheng Gao Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control under Ministry of Education North China Electric Power University Baoding Hebei China Jilin Electric Power Company Limited Changchun Jilin China

Microgrid, as a new effective way for large scale new energy and renewable energy power generation systems connected to the grid, injects new vigor into the power system. Focusing on the characteristics of P-f (active power versus frequency) droop and Q-V (reactive power versus voltage) droop, on the basis of analyzing the variable slope coefficient of droop characteristic, a droop control method of microsources based on divided self-adjusting slope coefficient is proposed in this paper. By calculating the quantity of the load fluctuation, this control method dynamically adjusts the active and reactive power maximums of inverters in the range of the inverter ratings to change the slope coefficients of droop curves. The aim of this method is to decrease the deviation of the frequency and voltage magnitude of the microgrid bus effectively. The simulation result verifies the correctness and feasibility of this control method.

关键词： Reactive power Inverters Fluctuations Voltage control Artificial neural networks

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An improved grey model for forecasting spot and long term electricity price

An improved grey model for forecasting spot and long term el...

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International Conference on power system Technology (powerCON)

作者： Zheng Yanan Gengyin Li Ming Zhou Shan Lin K L Lo Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control under Ministry of Education North China Electric Power University Beijing China Department of Electronic and Electrical Engineering University of Strathclyde Glasgow UK

With the deepening reform to power industries, power systems are going to gradually open the demand side and the power consumers have to face the changes of their role in the market, and make a preliminary long-term forecasting for the electricity prices. In order to consider the relations between the spot market and the long-term contract market, this paper builds a multi-electricity price grey model to comprehensive forecast the prices of the 2 markets; further researches the structure of the background value, and improves the multi-electricity price grey model; and introduces the residual error, the related grade, the mean variance ratio and the little probability of error as test indexes. The test results show that the multi-electricity price grey forecasting model and its improved model have better accuracy, and the improved model has stronger adaptability and extends the application range.

关键词： Forecasting Contracts Predictive models Electricity Accuracy Fitting Indexes

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