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Li J.,Xinjiang Electrical Power Dispatching and Communication Center | Yao X.,Xinjiang Electrical Power Dispatching and Communication Center | Kuang R.,Xinjiang Electrical Power Dispatching and Communication Center | Zhang P.,Beijing Tianyuankechuang Wind Power Technology Co. | And 2 more authors.
Dianli Xitong Zidonghua/Automation of Electric Power Systems | Year: 2011

Large scaled wind farms are being connected to the power grid rapidly, which imposes a new challenge to the active power dispatch and control of power grids. A wind farm active power control strategy developed on the base of automatic generation control (AGC) function of the energy management system (EMS) is illustrated. The realization scheme of the control strategy is introduced, together with the related technical measures in communication mode of wind farms and the control logic of wind turbines. Actual test in wind farm proves that the proposed control strategy can achieve rapid and accurate control of active power. ©2011 State Grid Electric Power Research Institute Press. Source


Zhang X.,North China Electrical Power University | Chen Y.,North China Electrical Power University | Zhu X.,North China Electrical Power University | Fu Y.,North China Electrical Power University | And 3 more authors.
IET Conference Publications | Year: 2015

This paper investigates an improved inertia control strategy of variable speed wind turbines, which provides with a novel approach to dynamic characteristics enhancement during frequency and oscillation events. Based on the analysis of the impacts of frequency control on inter-area power oscillation, an improved frequency control scheme of wind turbines is proposed. In this scheme, a first-order lag differential control loop is added in traditional PD controller, so that the frequency regulation and power oscillation damping functions are combined in one unified controller to enhance the interconnected network stability, moreover it is easier for setting the parameters. A typical two-area system containing three synchronous generators and a DFIG based wind turbine with high wind penetration is tested to validate the proposed control strategies. Simulation results show that wind farms can provide rapid frequency response and positive oscillation damping using the proposed control strategy. Therefore, the dynamic stability of the grid with high wind power penetration can be significantly improved. Source


Zhu X.,North China Electrical Power University | Cai J.,North China Electrical Power University | Yan Q.,Xinjiang Electrical Power Dispatching and Communication Center | Chen J.,Xinjiang Electrical Power Dispatching and Communication Center | Wang X.,Xinjiang Electrical Power Dispatching and Communication Center
IET Conference Publications | Year: 2015

The battery-based islanded DC micro-grid possesses low inertia at the moment when the system is disturbed due to the access of a large number of power electric converters. In this paper, to optimize the use of rotational kinetic energy concealed in DC micro-grid, a virtual inertia control strategy for DC micro-grid is proposed through associating DC bus voltage with the speed regulation of PMSG. Take the wind-battery-based islanded DC micro-grid for example, this paper analyses the system inertia previously, and then its small-signal models are derived. The system stability is compared between with and without virtual inertia control and the results demonstrate that the system stability can be enhanced remarkably when the virtual inertia control strategy is added into DC micro-grid. Also the model is established in MATLAB/SIMULINK and the simulation results validate that the virtual inertia control not only can enhance the system transient stability but also can protect the battery and even prolong the service life of it. Source


Zhao M.,China Electric Power Research Institute | Li F.,China Electric Power Research Institute | Yao X.,Xinjiang Electrical Power Dispatching and Communication Center | Shi H.,China Electric Power Research Institute | And 2 more authors.
2010 International Conference on Power System Technology: Technological Innovations Making Power Grid Smarter, POWERCON2010 | Year: 2010

Transient stability constrained total transfer capability is one of common power system calculation. In this paper, a practical total transfer capability calculation method considering transient stability constraints is proposed, which can be applied to large interconnected power systems. The main advantages of the proposed method includes: Load flow calculation convergence at each operation in the process of transient stability constrained total transfer capability calculation can be improved greatly; active and reactive power of generators and loads can be adjusted automatically according to specified rule; reactive power compensation such as shunt capacitor, shunt reactor, etc. can be considered automatically, which means that reactive power compensation can be switched on or off according to the change of power system operation point. For the further application to the large interconnected power system, this paper initially designed distributed computing architecture to enhance efficiency of fault check based on PSASP@home. In the end, software developed by this paper for transient stability constrained total transfer capability calculation is introduced. ©2010 IEEE. Source

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