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STATCOM/BESS decoupling control strategies of active and reactive power is proposed for a single wind turbine with squirrel-cage induction generator (WSG). This control strategy can not only effectively suppress power fluctuations of WSG output, achieve unity power factor and grid connected control so as to significantly improve the power quality of WSG, but also real-timely adjust extra power into...
The unbalanced grid voltage in wind farm with squirrel-cage induction generators (SCIG) can cause generator torque oscillations with double grid frequency that reduce lifetime of drive train. In this paper, the mechanism and control strategy of reducing generator torque oscillations using the static synchronous compensator (STATCOM) is investigated for wind farm with SCIG under unbalanced voltage...
In order to improve the fault ride-though (FRT) capability of PMSG-based wind turbine generation system, an energy storage system composed of ultracapacitor (UC) and bidirectional Buck-Boost converter (BDBBC) paralleled to the DC-link of the dual PWM converter is used in this paper. The integrated control strategy for both grid-side converter (GSC) and BDBBC has been presented, which has two working...
Multibrid wind power generation system (MWPGS) has aroused more and more attention for its high energy conversion efficiency, high reliability, and flexible grid-connected power control. In order to capture maximum power from wind during wind speeds below-rated and enhance its security and reliability during wind speeds above-rated, a unified control strategy for MWPGS's generator-side converter is...
The digital photovoltaic (PV) simulator presented by this paper is designed based on Push-Pull Forward (PPF) topological structure and digital control principle. The digital PV simulator can be able to behave electrically similar to PV array but without depending on weather conditions. That makes it convenient to perform different PV energy production system tests and verifications under many diverse...
On behalf of MACE 2011 Organizing Committee, I bid a warmly welcome to your gathering here to participate in the International Conference on Mechanic Automation and Control Engineering in Hohhot, China.
The study on brushless doubly-fed generation system is a promising development in VSCF system. The generator, as the key part of wind power generation system, plays very important role. Based on the analysis of the structure and principle of the brushless doubly-fed generation system, the mathematical model under rotor reference frame (d-q axis) is derived, and the simulation model is established...
This paper investigates the use of a static synchronous compensator (STATCOM) to mitigate the voltage fluctuations and improve fault ride-through capability of wind farm with fixed speed induction generators. In order to assure STATCOM of running safely and reliably in both normal and faulty conditions, a novel control strategy which combines negative-sequence voltage feed-forward control with conventional...
The nonlinear fuzzy PID control strategy, which combines nonlinear control, fuzzy control and PID control, is put forward in this paper to deal with the control of a class of nonlinear and large inertia plants under complicated and large variation conditions. The proposed control strategy can adjust control parameters timely and appropriately according to the dynamic characteristics of the systems,...
In order to ensure the grid side converter and static reactive compensator in wind power systems run safely and reliably under unbalanced grid voltage, it is the basic requirement that the phase and frequency of the positive sequence fundamental component of grid voltage are obtained quickly and accurately. Because the dynamic behavior of the phase locked loop (PLL) based on the synchronous reference...
Based on a configuration with low cost and high reliability, disturbance injection method is employed to achieve the maximum power point tracking (MPPT) for the small wind turbine generating systems(SWTGS) in this paper. State space averaging method is used to model the whole system, and its nonlinear and linearization model are given. The choosing principle of two crucial parameters of disturbance...
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