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检索条件"机构=Key Lab of Power System Intelligent Dispatch and Control"

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A robust measurement placement method in distribution system state estimation

A robust measurement placement method in distribution system...

引用

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

作者： Hong Wang Zongying Feng Xiaodong Chu Wen Zhang Key Laboratory of Power System Intelligent Dispatch and Control of Ministry of Education School of Electrical Engineering Shandong University Jinan China

ISBN: (纸本)9781479975389

A robust measurement system can take account of the influence on Distribution system State Estimation (DSSE) caused by network reconfiguration. This paper proposes an optimization algorithm to determine the number and position of the measurement devices separately. The concept of measurement saturation is proposed, and the position of measurement devices is determined based on a heuristic algorithm constrained by the saturate number. Both network reconfiguration and the uncertainties introduced by the measurements are taken into account. The probabilities of different network configurations are given by Markov chain, and the uncertainties introduced by the measurements are simulated by Monte Carlo algorithm. The results obtained on IEEE33-bus system demonstrate that saturate number is usually one third of the number of nodes for a system, and the robust measurement placement method considering different network configurations can improve the precision of DSSE.

关键词： Measurement uncertainty Position measurement State estimation Real-time systems power measurement Robustness Current measurement

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Open Architecture and Its Implementation of power system Numerical Simulation Software

Open Architecture and Its Implementation of Power System Num...

引用

2014 International Conference on Artificial,Intelligence and Software Engineering(AISE 2014)

作者： Wen-xin LYU Xin-huan JIANG Qun XU Heng-xu ZHANG Key Laboratory of Power System Intelligent Dispatch and Control of Ministry of Education Shandong University Qingdao Power Company Shandong State Grid Corporation of China

An open architecture of power system numerical simulation software is proposed, the interface information between simulation engine and user program is exchanged by Client/Server implementation. The open application program interface is realized by establishing an identical and standardized database(a normalized function interface table) on both sides so that they can understand each other through table searching. The client-side secondary development is not limited to single programming language. Interface software packages have been developed for different programming languages including C++, Matlab and Python. It is verified that the proposed framework has powerful openness as well as flexibility, which will greatly improve the calculating and analyzing capabilities of the power system numerical simulation software.

关键词： power system Numerical simulation Application program interface(API) Open architecture

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Fuzzy control Design for Thermostatically controlled Loads Considering Consumers’ Thermal Comfort

Fuzzy Control Design for Thermostatically Controlled Loads C...

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The 2014 10th International Conference on Natural Computation (ICNC 2014) and the 2014 11th International Conference on Fuzzy systems and Knowledge Discovery (FSKD 2014)(第十届自然计算和第十一届模糊系统与知识发现国际会议)

作者： Xiaodong Chu Wen Zhang Yutian Liu Rongxiang Zhang Yuanhong Hou Key Laboratory of Power System Intelligent Dispatch and Control of Ministry of Education(Shandong Un Electric Power Economic and Technological Research Institute Shandong Electric Power Corporation of

ISBN: (纸本)9781479951499

In this paper,a decentralized load control scheme for power system frequency regulation is *** scheme is on the use of thermal energy storage capacity in thermostatically controlled loads(TCLs)considering consumers' thermal comfort.A fuzzy algorithm is applied to the evaluation of consumers' comfort level,in which temperature and relative humidity of the conditioned space are *** fuzzy rule is embedded into the frequency control loop of *** mismatch between generation and load is represented by the system frequency deviation that is measured *** the aggregation of decentralized loads response,Monte-Carlo sampling is conducted to address the randomness of model *** studies show that the proposed scheme can mitigate frequency deviation caused by generation-load *** frequency can be also restored to a reasonable level within a short time without compromising consumers' comfort.

关键词： consumers’ comfort frequency regulation fuzzy algorithm power system thermostatically controlled load

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A coordination control strategy of voltage source converter based MTDC for offshore wind farms

A coordination control strategy of voltage source converter ...

引用

2014 IEEE Industry Application Society Annual Meeting, IAS 2014

作者： Ren, Jing-Guo Li, Ke-Jun Sun, Lijun Zhao, Jian-Guo Liang, Yong-Liang Lee, Wei-Jen Ding, Zhao-Hao Sun, Ying Key Laboratory of Power System Intelligent Dispatch and Control of Ministry of Education Shandong University Jinan250061 China State Grid of China Technology College Jinan250002 China Energy Systems Research Center University of Texas at Arlington ArlingtonTX76019 United States Shandong Electric Power Research Institute China

ISBN: (纸本)9781479922888

This paper proposes a coordination control strategy of voltage source converter based multi-terminal DC (VSC-MTDC) transmission system for integrating large-scale offshore wind power. Using a typical five-terminal DC transmission system as an example, coordination control strategy based on local controller among converter stations is proposed. Based on the DC voltage -Active power characteristic, improved control strategy for auxiliary converter station and APC converter station are proposed respectively. Also the working mode of the two converter stations is analyzed. The basis of parameter selection of auxiliary converter station and APC converter station is presented due to DC power flow distribution and maximum and minimum operational mode. Finally, simulations in PSCAD/EMTDC are conducted to validate the multi-point DC voltage control method under various operating state in normal, master converter station fault and auxiliary converter station fault conditions respectively. Results show that this method can guarantee the active power allocation of VSC-MTDC transmission system and good control effects are obtained. © 2014 IEEE.

关键词： Offshore wind farms

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The generator start-up sequence optimization following a blackout

The generator start-up sequence optimization following a bla...

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中国电机工程学会电力系统专业委员会2014年学术年会

作者： Hainan ZHU Yutian LIU Key Laboratory of Power System Intelligent Dispatch and Control of Ministry of Education Shandong University17923 Jingshi RoadJinan 250061China

After black-start(BS) generator restarts successfully during system restoration process, it is a primary task to provide cranking power to non-black-start(NBS) generators.A two-step optimal generator start-up sequence method for power system restoration is proposed in this *** step Ⅰ, the generator which is easiest to restart is selected as the first generator for safe *** step Ⅱ, a multi-objective optimization model which has a primary objective and two secondary objectives is built with consideration of the influence of restoration paths.A neighborhood is designed by the neighborhood search method to ensure the quality of solutions according to the solution of the primary ***-EDA is applied to search pareto optimal solutions in the designed *** results of a practical power system demonstrate the two-step method can take less time to determine several pareto optimal generator sequences and corresponding restoration paths and has potential to be used to guide restoration process in real time.

关键词： power system restoration two-step method generator start-up sequence neighborhood search method multi-objective optimization model

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Valuation and Allocation of Spinning Reserve Considering power Network Constraints

Valuation and Allocation of Spinning Reserve Considering Pow...

引用

IEEE power and Energy Society General Meeting

作者： Kai Wang Xiaodong Chu Wen Zhang Key Laboratory of Power System Intelligent Dispatch and Control of Ministry of Education Shandong University Jinan P. R. China

To ensure the reliable operation of power systems, adequate reserve capacity must be allocated properly. Considering transmission constraints, reserve capacity from various nodes has different effects on the system reliability. Spinning reserve is procured in this paper responding to the imbalance between load and generation, which influences system reliability level described by the value of lost load (VOLL). The reserve value is derived through VOLL. From the perspective of demand and supply equilibrium, a reasonable decision can be made for spinning reserve allocation at each node. Simulation results demonstrate the effectiveness of the proposed scheme.

关键词： Hafnium

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An improved power sharing control scheme of distributed generation converters in microgrid

An improved power sharing control scheme of distributed gene...

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International Electronics and Application Conference and Exposition (PEAC)

作者： Guangqian Ding Feng Gao Quanrui Hao Song Zhang Key Lab of Power System Intelligent Dispatch and Control Shandong University Jinan China Grid Operation Department State Grid of China Technology College Jinan China

ISBN: (纸本)9781479967698

This paper proposes an improved power sharing control scheme to achieve the accurate power sharing control and offer an improved PCC voltage regulation capability in islanding microgrid. An enhanced virtual impedance design is assumed in the conventional droop control scheme to manage distributed generation (DG) units to export the accurate reactive power in proportion to their rating. A point of common coupling (PCC) voltage restoration control is implemented to eliminate the PCC voltage deviation produced by the droop control effect and voltage drop effect on the impedance. This control scheme of each individual DG unit was designed to only use the locally measured feedback variables of inverter. It can realize accurate reactive power sharing and guarantee the PCC voltage quality. Matlab simulations are presented to show the effectiveness of proposed control performance in islanding microgrid.

关键词： Voltage control Impedance Microgrids Reactive power Inverters Load modeling Frequency control

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Coordinated control strategy of air-conditioning loads for power system balancing

Coordinated control strategy of air-conditioning loads for p...

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International Conference on power system Technology (powerCON)

作者： Meng Liu Zhongkang Wei Xiaodong Chu Wen Zhang Key Laboratory of Power System Intelligent Dispatch and Control of Ministry of Education (Shandong University) Jinan China State Grid Jibei Electric Power Company Beijing China

In this paper a coordinated control strategy of air-conditioning load groups is proposed to help correct imbalances between load and generation, especially when the power system is under stressed conditions such as the loss of power generation. Firstly, a decentralized air-conditioning load group control strategy (control mode 1) is presented accounting for maintenance of load diversity, so that the large oscillations of aggregated power of load group caused by diversity loss can be avoided. However, there is an unwanted parasitic "power peak" in the control mode 1. To eliminate the negative effects of the "power peak", another load control strategy (control mode 2) is borrowed from the literature which requires to communicate with the control center. Both of the control modes 1 and 2 adopt a segmental load recovery scheme to avoid "recovery peak". Then, a coordinated load control strategy is presented to coordinate the control modes 1 and 2. The "power peak" in control mode 1 is used as the power control objective for the load group of the control mode 2, and the control signal for control mode 2 can be calculated using the dichotomy method. Simulation results verify the effectiveness of the proposed coordinated control strategy of air-conditioning loads for power system balancing.

关键词： Load flow control Temperature control power systems Load modeling Frequency control Atmospheric modeling Oscillators

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Generalized impedance-based fault distance calculation mehtod for power distribution systems

Generalized impedance-based fault distance calculation mehto...

引用

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

作者： Kongming Sun Qing Chen Zhanjun Gao Dawei Liu Gonglin Zhang Key Laboratory of Power System Intelligent Dispatch and Control (Shandong University) Ministry of Education Jinan China State Grid Fujian Electric Power Research Institute Fuzhou China

ISBN: (纸本)9781479975389

This paper presents a new impedance-based fault distance calculation formulation for power distribution systems. The majority of low- or medium- voltage distribution systems are characterized by having numerous branches, laterals and sub-laterals, highly unbalanced operation, and time varying load profile. All of these and other characteristics make most efficient approaches proposed for fault location in power distribution systems not applicable to distribution systems. The proposed method uses only measurements of voltage and current at the beginning of the analyzed feeder, and additional equipments such as, fault locators and monitoring devices are not needed to be installed in the distribution system. The apparent impedance is calculated by using the fundamental rms values of the measured voltage and current in this paper. This method is suitable to any kinds of fault and can be used to unbalanced power distribution systems, since it is derived in phase domain.

关键词： Fault location Voltage measurement Circuit faults power distribution Impedance Algorithm design and analysis

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Optimization and decision for limiting short circuit current considering sensitivity ranking

Optimization and decision for limiting short circuit current...

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International Conference on power system Technology (powerCON)

作者： Dong Yang Kang Zhao Yan Zhao Yutian Liu State Grid Shandong Electric Power Research Institute Jinan China Key Laboratory of Power System Intelligent Dispatch and Control of Ministry of Education (Shandong University) Jinan China

ISBN: (纸本)9781479950331

Limiting short circuit current and increasing power system stability is a contradiction. An optimization and decision model for limiting short circuit current considering sensitivity ranking is established. Firstly, the influence on impedance matrix caused by current limiting measures is analyzed, and a variable selection strategy considering the sensitivity relation between current limiting measures and node self-impedance is proposed. Secondly, the objective functions which minimize the total investment costs and the short circuit capacity margin are presented, and an adaptive hybrid particle swarm optimization algorithm is used to find a scheme set. Finally, a comprehensive evaluation model is established based analytic hierarchy process and the systematic and quantitative assessments are realized by the fuzzy algorithm. Simulation results of the practical power grid demonstrated the efficiency and speediness of this proposed model.

关键词： Limiting Short-circuit currents Current measurement Optimization Inductors power system stability Sensitivity

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