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Li W.,The Ministry of Science and Technology of Yunnan Power Grid Co. | Jiang Y.,Yunnan Electrical power dispatching control center | Lei B.,YINENG CHINA Power Technology Co. | Yu F.,YINENG CHINA Power Technology Co.
Dianli Xitong Baohu yu Kongzhi/Power System Protection and Control | Year: 2015

A Multi-Agent System (MAS) based energy optimization management strategy for microgrid in market operation environment is proposed in order to maximize the cost and environment benefit. Firstly, the MAS is constructed, which consists of one market operator Agent (MOA), several MG Management Agents (MMA), one Utility Grid Agent (UGA), and many DG Agents (DGA). Then the power price bidding strategy is designed in the MOA according to the generation power plan provided by all the MMAs. By the power price bidding strategy, the best trade price and bid-winning power are determined in order to maximize economic benefit. On the basis of this, the energy management strategy is designed in MMAs, by which the optimal power dispatches for all DGAs are obtained by using an improved particle swarm optimization method for minimizing the operating cost. Finally, the validity of proposed method is demonstrated by means of simulation results. ©, 2015, Power System Protection and Control Press. All right reserved. Source


Xu D.-L.,North China Electrical Power University | Cai B.-R.,Yunnan Electrical power dispatching control center | Liu Y.-Q.,North China Electrical Power University | Liu X.,North China Electrical Power University
Procedia Engineering | Year: 2011

With the constant expansion of Yunnan power grid, in current dispatching Automatic generation Control (AGC) mode, the use effect of small and medium-sized hydropower resources in the unified dispatching was not ideal. By building zoning control model artificially, the control targets and their coordinated relationship between main area and sub-areas are explicitly pointed out. The zoning and layered control mode of AGC between provincial dispatching and regional dispatching is put forward. Analysis and comparison are also made of the "independent zoning and layered control mode" and "coordinated zoning and layered control mode", and then their existing problems are pointed out. The research can provide the foundation of further study on AGC coordinated control strategies between provincial dispatching and regional dispatching, which can realize single goal and multi-objects of AGC coordinated control in the power grid. © 2011 Published by Elsevier Ltd. Source


Jiang Y.,Yunnan Electrical power dispatching control center | Li W.,The Ministry of Science and Technology of Yunnan Power Grid Co. | Zhao Y.,Yunnan Electrical power dispatching control center | Yu F.,YINENG CHINA Power Technology Co.
Dianli Xitong Baohu yu Kongzhi/Power System Protection and Control | Year: 2015

One of the core objectives of power system operation is to provide high-quality energy, the quality indicators of power system operation are mainly reflected by power quality. In order to assess the power quality objectively and effectively, a comprehensive evaluation method of high-quality network operation based on rough set and evidence theory is proposed. The method applies rough set theory to define the decision-making strength and expansion rules and uses the decision-making table to obtain the basic probability assignment of evidence theory, which make the result of probability assignment more objective. And then by applying the fusion rules of evidence theory to integrate the various indicators of power quality, the pros and cons of ordering from each power quality evaluations can be obtained to achieve a comprehensive evaluation of power quality. The examples show that the results of power quality evaluation are more objective and rational by using this method. So it can prove the correctness and superiority of this method. ©, 2015, Power System Protection and Control Press. All right reserved. Source


Chen R.,Yunnan Electrical power dispatching control center | Chen F.,Yunnan Electrical power dispatching control center | Zhang F.,Yunnan Electrical power dispatching control center | Cheng G.,YINENG CHINA Power Technology Co.
Dianli Xitong Baohu yu Kongzhi/Power System Protection and Control | Year: 2015

For the purpose of enhancing stabilization performance of three-phase grid-connected inverter, the robust stability control of micro-source inverter interface is studied. Firstly, based on the three-phase grid-connected inverter system, the three-order mathematical model is established. Then, taking into account uncertain parameters in the system dynamic model, a robust controller is designed based on Lyapunov robust stabilization method. Some sufficient conditions for the system stability are presented in terms of linear matrix inequalities (LMI) only dependent on the robust performance index. By using the convex optimization technique of LMI in MATLAB toolbox, the minimum robust performance index and the parameters of the robust controller can be obtained efficiently. The effectiveness of the proposed control scheme is demonstrated through simulation examples. ©, 2015, Power System Protection and Control Press. All right reserved. Source


Zhao Y.,Yunnan Electrical power dispatching control center | Zhao C.,Yunnan Electrical power dispatching control center | Ye H.,Yunnan Electrical power dispatching control center | Yu F.,YINENG CHINA Power Technology Co.
Dianli Xitong Baohu yu Kongzhi/Power System Protection and Control | Year: 2015

Voltage sag is a typical power quality disturbance. Identifying the type of disturbance source causing voltage sag accurately is one of the important matters in power quality monitoring and management. Due to the correlativity and redundancy of the features, the identification method for voltage sag disturbance source has low accuracy. To resolve the problem, this paper proposes a method of feature reduction of voltage sag disturbance based on principal component analysis (PCA). Through the analysis of single disturbance source of voltage sag and complex disturbance source of voltage sag, multiple feature indices of voltage sag are obtained using wavelet coefficients in terms of statistics, wave morphology, entropy, energy, etc. These original feature indices are correlative and redundant. Based on PCA, the original feature indices are normalized, and then the covariance matrix is calculated, a couple of comprehensive feature indices after reduction can be obtained lastly. The correlativity and redundancy of the comprehensive feature indices are eliminated effectively. General classifier is used to verify the method. The simulation results show that comprehensive feature indices after reduction can effectively reduce the number of feature vectors which are input to SVM and the identification accuracy which is obtained using comprehensive feature indices is higher than the original features indices in the classification and identification of single and complex disturbance source of voltage sag under different noisy conditions. ©, 2015, Power System Protection and Control Press. All right reserved. Source

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