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Chen M.-J.,Shanghai JiaoTong University | Chen C.,Shanghai JiaoTong University | Wu B.,Fuzhou Electrical Power Bureau | Zhou X.-F.,Shanghai JiaoTong University | Cao G.-Y.,Shanghai JiaoTong University
Gaodianya Jishu/High Voltage Engineering | Year: 2010

To analyze the effect of stochastic parameters in power system on dynamic simulation, a novel method based on the two-point estimation method (TPEM) was presented for dynamic voltage stability analysis. The method evaluated the dynamic voltage stability through the TPEM and quasi-steady state analysis. Considering the compensation effect of STATCOM on voltage stability, the proposed method was used to study the system with STATCOM, and the indexes of bus voltage in stochastic faults were calculated. Numerical analysis verifies the accuracy of this algorithm and fast calculation, which can provide the guidance to the power system planning and design.

Chen M.-J.,Fujian Power Equipments Maintenance Company | Wang J.,Shanghai JiaoTong University | Chen C.,Shanghai JiaoTong University | Cao G.-Y.,Shanghai JiaoTong University | Wu B.,Fuzhou Electrical Power Bureau
Gaodianya Jishu/High Voltage Engineering | Year: 2010

Considering nonlinear power system with the form of differential algebraic system, we proposed a new nonlinear STATCOM controller structure which contains multi machine power system applying the generalized Hamiltonian system and relevant control strategy. The power injection based STATCOM model was the object in controller design. And the STATCOM controller in multi machine power system was obtained to improve the system robustness, which had precise mathematical and physical meaning. Simulation results of a 3-machine and 9-node system with STATCOM verify that the controller proposed in this paper is effective to power system voltage stability.

Zhu J.,China Electric Power Research Institute | Bao X.,China Electric Power Research Institute | Bao X.,Beijing Jiaotong University | Qiu M.,China Electric Power Research Institute | And 3 more authors.
Diangong Jishu Xuebao/Transactions of China Electrotechnical Society | Year: 2012

A kJ class high temperature superconducting magnetic energy storage system (HT-SMES) composed of first generation (BSCCO) and second generation (YBCO) HTS wires with sub-cooled LN2 cooling system was optimal designed and applied for the power fluctuation compensation in power system. A dual processor combined with the digital signal processor (DSP) and the micro-programmed control unit (MCU) was proposed and used in the LCL filtered voltage source converter for the hybrid SMES. Based on the SVPWM the power fluctuation compensation strategy of the SMES and its program realization based on the code composer studio (CCS) were given for achieving the dynamic monitoring and compensation strategy calculation in power system. Finally, a dynamic simulation test system with this SMES and a 200km length transmission line for compensation the power fluctuation was build up. The experimental results show that the SMES can output the required compensation electric power and restrain the power fluctuation in millisecond, which validate the effectiveness of the SMES converter and the control strategy as well.

Huang Y.-Q.,Fuzhou Electrical Power Bureau | Fang B.-Y.,Fuzhou Electrical Power Bureau | Sun J.-F.,Fuzhou Electrical Power Bureau
Dianli Xitong Baohu yu Kongzhi/Power System Protection and Control | Year: 2011

Micro sources in the micro grid, represented by distributed wind power generations and photovoltaic generations, have such characteristics as the stochastic disturbance and output power fluctuations. When the grid-connected micro grid comes into the island operation mode, most of the load or even all have to be cut off due to weak anti-disturbance capability and the power shortage. The flywheel energy storage system(FESS)assisted micro grid scheme is adopted, which utilizes the characteristic of high power charge and discharge ability and infinite charge and discharge numbers of FESS, to design the fixed power control method of grid-connected inverter. The output current of the grid-connected inverter is decided through measuring the grid side power, which can smooth the power and load fluctuations of micro sources. When the transient faults occur in the main grid, large amount of power can be provided to micro grid by FESS for a short time, keeping most of the load normally work to wait for the reclosing of the main grid. The theoretical analysis and simulation experiment show that FESS applied in the micro grid is feasible, economic, and efficient, which can improve the anti-disaster ability of the micro grid.

Liu L.,Fuzhou University | Li J.,Fuzhou Electrical Power Bureau | Cai J.,Fuzhou University
Dianli Zidonghua Shebei/Electric Power Automation Equipment | Year: 2010

An algorithm based on induction-enhanced particle swarm optimization and chaos search is proposed for reactive power optimization to solve the problems of traditional PSO(Particle Swarm Optimization), such as local optimum and slow convergence, and improve the ability of global optimization. During the early search, the induction is introduced to the update of particle position to decrease the randomicity of PSO and improve the search efficiency, while during the late search, the strange attractor character of chaos is applied to effectively avoid the premature of PSO and find the global optimal solution. Calculations for a power distribution system show that, the optimal loss-lowering rate is 14.04%, and the minimum voltage is increased from 0.8950 p. u. to 0.9956 p. u., validating the feasibility and effectiveness of the proposed algorithm.

Song S.,Fuzhou Electrical Power Bureau | Fu C.,North China Electrical Power University | Zhang L.,Fuzhou Electrical Power Bureau | Wang Y.,North China Electrical Power University
Dianli Xitong Zidonghua/Automation of Electric Power Systems | Year: 2010

The ″synchronization detected″ control logic is generally used in the reclosing relay of small power source's 110 kV double-ended tie-line. However, when the fault occurs in the tie-line with wind farm interconnected, it is difficult for the reclosing relay at the wind power side to successfully act if the synchronization detected control logic is used. According to the control theory of the wind turbine driven doubly fed induction generator (DFIG) and the fault recording waveform, the reason for the failure is analyzed. Based on the studies, a proper coordination mode of reclosing relays in the tie-line is proposed and applied in practice, which efficiently improves the reliability of the tie-line. ©2010 State Grid Electric Power Research Institute Press.

Fang T.,Fuzhou Electrical Power Bureau | Wang K.,Fuzhou Electrical Power Bureau | Chen Y.-J.,Fuzhou Electrical Power Bureau
Dianli Xitong Baohu yu Kongzhi/Power System Protection and Control | Year: 2010

This paper introduces the functions and the development process of the substation integrated automation system. It sums up the points which should pay attention to by the on-site debug experiences, including major loop, protective device, structure, backstage signal, and so on. Taking real substation as an example, the paper focuses on the strategies and solutions about the common problems of the integrated automation system and gives some advice on its configuration for daily maintenance. Finally, it describes some prospects of the integrated automation system.

Lin H.,Fuzhou Electrical Power Bureau | Wu X.,Fuzhou Electrical Power Bureau | Lu T.,Fuzhou Electrical Power Bureau | Gao K.,Fuzhou Electrical Power Bureau
Dianli Zidonghua Shebei/Electric Power Automation Equipment | Year: 2012

220 kV transformer is a kind of semi-insulating transformer and the insulation against ground of its windings near its neutral point is weaker, for which a gap protection is usually equipped. The gap zero-sequence current and zero-sequence voltage of traditional gap protection share the same delay component. An action of main transformer gap protection during a lightning strike of line is analyzed and the conclusion is that, as the gap zero-sequence current and zero-sequence voltage are used in two types of transformer protection under different operation modes, they should have different delayed trips. The delay of gap zero-sequence current protection should be longer, coordinating with the line reclose time.

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