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Xu S.,Key Laboratory of Control of Power Transmission and Conversion | Feng D.,Key Laboratory of Control of Power Transmission and Conversion | Yan Z.,Key Laboratory of Control of Power Transmission and Conversion | Zhang L.,Key Laboratory of Control of Power Transmission and Conversion | And 3 more authors.
International Journal of Distributed Sensor Networks | Year: 2013

Uncontrolled charging of large-scale electric vehicles (EVs) can affect the safe and economic operation of power systems, especially at the distribution level. The centralized EVs charging optimization methods require complete information of physical appliances and using habits, which will cause problems of high dimensionality and communication block. Given this, an ant-based swarm algorithm (ASA) is proposed to realize the EVs charging coordination at the transformer level, which can overcome the drawbacks of centralized control method. First, the EV charging load model is developed, and the charging management structure based on swarm intelligence is presented. Second, basic data of the EV using habit is sampled by the Monte Carlo method, and the ASA is applied to realize the load valley filling. The load fluctuation and the transformer capacity are also considered in the algorithm. Finally, the charging coordination of 500 EVs under a 12.47 KV transformer is simulated to demonstrate the validity of the proposed method. © 2013 Shaolun Xu et al.


Liu L.,Key Laboratory of Control of Power Transmission and Conversion | Cheng H.-Z.,Key Laboratory of Control of Power Transmission and Conversion | Yao L.-Z.,China Electric Power Research Institute | Ma Z.-L.,East China Grid Company | Bazargan M.,China Electric Power Research Institute
International Transactions on Electrical Energy Systems | Year: 2013

Compared with traditional transmission network expansion planning, the exact life cycle cost is worth further studying. A three-dimensional life cycle cost (LCC) model for entire transmission network which consists of time dimension, component dimension and cost dimension is proposed. The device layer, the system layer and the cost of externalities of cost dimension are described and formulated in detail. The conditional value at risk (CVaR) of social welfare is established through optimal power flow calculation so as to take social responsibility into consideration. The multi-objective multi-stage transmission network expansion planning model is constituted with two objectives which are minimum LCC and minimum CVaR of social welfare. Four uncertain factors including wind power are considered and simulated through Monte Carlo method. An effective normal boundary intersection algorithm integrated with improved niche genetic method is presented to solve the proposed model. The case studies carried out on the 18-bus system and 77-bus system not only generate even distributed pareto set but also recommend the optimal planning scheme. The comparisons between the proposed scheme and existing method verify the feasibility and validity. Copyright © 2012 John Wiley and Sons, Ltd.


Hua-Wu L.,Key Laboratory of Control of Power Transmission and Conversion | Hong-Xing M.,Key Laboratory of Control of Power Transmission and Conversion | Jian-Feng J.,Key Laboratory of Control of Power Transmission and Conversion | Xi-Jun Y.,Key Laboratory of Control of Power Transmission and Conversion | Xing-Hua Y.,Key Laboratory of Control of Power Transmission and Conversion
Archives of Electrical Engineering | Year: 2013

With the continuous increase of output power ratings, multi-phase (multichannel) interleaved power factor corrector (IPFC) is gradually employed in domestic and commercial inverter air-conditioners. IPFC can solve several main problems, such as power rating increase, power device selection, input current ripple reduction as well as inductor on-board mounting. But for a multi-phase IPFC, the key problem is that it should show rapid dynamic responds and good current sharing capability, so in this paper the aim is to improve the dynamic performance and current sharing capability by means of passivity control theory. Considering the power circuit topology of a four-phase IPFC, an EL (Euler-Lagrange) mathematical model is established when the IPFC operates in continuous conduction mode (CCM). Then the passivity of the four-phase IPFC is proved, and the passivity-based controller using the state variables feedback and damping injection method is designed. The proposed control scheme, which is easy to control and needs no proportion integral controller, has strong robustness on disturbance from singlephase AC input voltage, the load as well as the parameters of the employed devices. Even in wide-range load condition, the mains current has a fast dynamic response and the average output voltage almost keep unchanged. As a result, the main functions of the four-phase IPFC are implemented including nearly unitary power factor and constant DC output voltage. Meanwhile, the four-phase IPFC acquires an excellent current sharing effect after using passivity-based controller. The above analysis has been proved with simulated results by means of MATLAB/SIMULINK and experimental results, showing that the passivity-based IPFC controller has superior performances and feasibility.


Wang N.,Key Laboratory of Control of Power Transmission and Conversion | Lu F.,Key Laboratory of Control of Power Transmission and Conversion | Ma H.-X.,Key Laboratory of Control of Power Transmission and Conversion | Li H.-W.,Key Laboratory of Control of Power Transmission and Conversion | And 2 more authors.
China International Conference on Electricity Distribution, CICED | Year: 2012

The high power domestic and commercial variable-frequency air conditioners powered by three-phase AC power supply have been widely used nowadays. In order to achieve much higher power factor at grid side, voltage source rectifiers (VSR) become popular. However, due to the high output voltage of VSR, the problem of common-mode voltage (CMV) on its DC link caused by traditional SPWM or SVPWM modulation algorithm is too serious to solve. Thus, the existing modulation algorithms of VSR should be modified to settle the problem of CMV. The paper designs a minimized CMV SVPWM modulation algorithm using non-zero vectors to replace the zero vectors, as well as a dead-time arrangement which causes no effect on CMV. Then the above theoretical analysis is verified via simulation by means of MATLAB/SIMULINK. The obtained results show that the minimized CMV SVPWM modulation algorithm can reduce the CMV, bringing about the alleviation of CMV interference. © 2012 IEEE.

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