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Shi L.,Hohai University | Chen S.,Jiangsu Taizhou Power Supply Company | Liu J.,Jiangsu Jiangyin Power Supply Company | Zhuang M.,Jiangsu DanYang Power Supply Company | Tang G.,Nanjing Southeast University
APAP 2011 - Proceedings: 2011 International Conference on Advanced Power System Automation and Protection | Year: 2011

Flywheel Energy Storage System (FESS) has been used for damping power system low-frequency oscillations by compensating for the imbalance power by affixation stabilizer, which has an independent active and reactive power controller. Because of the robustness problem of FESS-based stabilizer designed at one of the typical operation, it is proposed to design a robust FESS-based stabilizer by taking into account both multiple operations and damping torque analysis. All of the analytical conclusions have been confirmed by the results of eigenvalue analysis and non-linear simulation by an example of four-machine power system. © 2011 IEEE.


Gu W.,Nanjing Southeast University | Gu W.,Jiangsu Key Laboratory of Smart Grid Technology and Equipment | Wu Z.,Nanjing Southeast University | Wu Z.,Jiangsu Key Laboratory of Smart Grid Technology and Equipment | Wang R.,Jiangsu Taizhou Power Supply Company
Dianli Xitong Zidonghua/Automation of Electric Power Systems | Year: 2012

With an eye on the broad vistas of extensive application of the combined heat and power (CHP) system for its environment friendliness and energy-saving, an investigation has been made on the operation optimization of a CHP system composed of PV batteries, storage batteries, heat storage tank, microturbine (MT), heat recovery boiler, and thermo-electric loads. The characteristics of MT's electric power generation efficiency, exhaust heat recovery efficiency and pollutant gas emission are comprehensively considered. The kinetic battery model (KiBaM) is used to consider the minimum state of charge (SOC). Finally a multi-objective chance constrained programming (CCP) model is developed with PV and stochastic thermo-electric load, operation cost, CO emission and minimum NO x emission all taken into consideration. The stochastic simulation and Pareto set are used to solve the CCP problem. A revised multi-objective particle swarm optimization (MOPSO) based on local and global memory is proposed to solve the model. Simulation results show that, with this method, suggestions can be made to optimize microgrid configuration, realize micro-sources dynamic dispatching and effectively reduce the operation cost and pollution gas emission.


Shi L.,Hohai University | Zhang L.,Jiangsu Electric Power Company | Chen S.,Jiangsu Taizhou Power Supply Company | Tang G.,Nanjing Southeast University
Zhongguo Dianji Gongcheng Xuebao/Proceedings of the Chinese Society of Electrical Engineering | Year: 2011

In order to eliminate the negative interaction among stabilizers based on the flywheel energy storage system (FESS) and power system stabilizer (PSS), an improved particle swarm optimization (IPSO) was applied to coordinate and optimize FESS-based stabilizers and PSS, which combines the chaos algorithm and annealing algorithm. IPSO has the strong and overall searching ability and high efficiency by applying chaos initialization and annealing algorithm in iteration. The electromechanical modes and non-electromechanical modes were taken into account in the objective function which investigated all eigenvalues at multiple operation conditions. And parameters of all stabilizers were coordinated and optimized by IPSO. In the 10-machine New England system, the power system low-frequency oscillations are effectively suppressed at different operation conditions by the FESS-based stabilizers and PSS tuned by IPSO. The result indicates the validity and robustness of the IPSO. In the 4-machine system, the damping effect using stabilizers designed by IPSO is better than using stabilizers designed one by one, and it demonstrates the advantage of the IPSO. ©2011 Chinese Society for Electrical Engineering.


Lin D.,Nanjing Southeast University | Gu W.,Nanjing Southeast University | Wang Y.,Nanjing Southeast University | Yuan X.,Jiangsu Electric Power Research Institute | And 2 more authors.
Dianwang Jishu/Power System Technology | Year: 2013

The quantized result from synthetic evaluation of power quality is one of the foundations to assess power quality and is favorable to implement the market mechanism of pricing electric energy according to power quality. Integrating analytic hierarchy process (AHP) with entropy weight, the synthetical weights of power quality indices are determined; meanwhile, the thinking of spatial distance measurement is applied to synthetical evaluation of power quality to turn the power quality indices into pattern distance in space. The dynamic time wrapping (DTW) algorithm is adopted for sequence pattern identification to calculate matching coefficients among weighted standard power quality index sequence, power quality index sequence to be evaluated and ideal power quality index sequence, and then the grade of power quality is determined to implement the synthetical evaluation and level assessment of power quality. Calculation results of case study show that the proposed synthetical evaluation method is effective and feasible.


Shi L.,Hohai University | Zhang L.,Jiangsu Electric Power Company | Chen S.,Jiangsu Taizhou Power Supply Company | Liu J.,Jiangsu Jiangyin Power Supply Company
Dianli Zidonghua Shebei/Electric Power Automation Equipment | Year: 2011

The mechanism of power system oscillation damping by FESS (Flywheel Energy Storage System) is studied. The simplified dynamic model of FESS is built, the stator flux linkage orientated control strategy is adopted to decouple the control of its active power and reactive power, and the mechanism of power system oscillation damped by FESS is discussed respectively from the physical analysis, the theoretical analysis based on DTA (Damping Torque Analysis) and the graphic analysis based on equal area criterion. The eigenvalue analysis and non-linear simulative results for a single-machine infinite-bus power system with FESS show that, the damping added to either active or reactive power control loop of FESS can effectively suppress the power system oscillation and that added to its active loop has better effect; three analysis methods have identical right conclusions.


Yu X.P.,Henan Electric Power Research Institute | Zhang B.,Henan Electric Power Research Institute | Yang J.Z.,Jiangsu Taizhou Power Supply Company | Dai S.Y.,Henan Electric Power Research Institute | Dai Z.Q.,North China Electrical Power University
Advanced Materials Research | Year: 2014

This paper presents the rules of harmonic penetration in Zhengzhou harmonic voltage level. National standards limit the harmonic voltage distortion level in the buses, so study the UHV AC/DC hybrid system is significant to power grid. In order to find out the harmonic voltage level near Zhengzhou converter station, a method has been proposed in this paper, including the models of radiation power grid, load characteristics and converter station's AC filter. Finally, according to Zhengzhou converter station power frame sets up a detail model in the simulation software packages PSCAD/EMTDC to study the law of harmonic penetration. © (2014) Trans Tech Publications, Switzerland.

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