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This paper explores the performance of alternative voltage control strategy applied to direct drive synchronous wind generators, more specifically with permanent magnetic (PMSG). The reactive power control of the grid-side converter is investigated for voltage control purposes. In Brazil, the Grid National Operator (ONS) requires that wind turbines stay connected to the grid during voltage dips, but...
This paper deals with an application of the power balance theory in a voltage and frequency controller (VFC) of an autonomous wind power generation using an isolated asynchronous generator (IAG) feeding three-phase four wire loads. The reference generator currents are estimated using the power balance theory to control the voltage and frequency of IAG system. Three-leg voltage source converter (VSC)...
Renewable energy sources are becoming more and more important for power systems. With increasing sizes and a mandate to operate as financial entities seeking to maximize benefits in an electricity market, power systems require highly effective planning tools. In this paper, an optimal capacitor planning method based on optimal power flow is proposed for a power system with wind generators and PV arrays...
With the purpose of improving the operation efficiency of wind power generator, this paper, by analyzing the doubly-fed induction generatorpsilas (DFIG) power characteristic, built up the DFIG active power reference calculation model to achieve the maximal power point tracing (MPPT) and the reactive power reference calculation model to minimize generator loss. The stator flux-linkage oriented vector...
This paper discusses a control strategy of direct-drive permanent magnet wind power system, and proposes back-to-back PWM converter control method that PWM technology is employed both in generator-side and grid-side. The system consists of permanent magnet synchronous generator (PMSG), PWM rectifier in generator-side, intermediate DC circuit, and PWM inverter in grid-side. DC voltage control is used...
Compared with the doubly-fed AC excited wind-power generation system, the directly-driven permanent magnet synchronous generator (PMSG) for wind-power system has advantage of simpler structure, higher generation efficiency and more reliable operation. To solve the weakness associated with the traditional id=0 control scheme, such as relatively large power rating for generator-side converter and correspondingly...
Permanent magnet synchronous generation (PMSG) has been more and more used in the wind power generation system due to its advantage of simpler structure, higher generation efficiency and more reliable operation. However, the behavior of wind power system during grid disturbances becomes more important with an increasing amount of wind energy installed. Nowadays the grid code demands that the wind...
Since variable-speed generation has a higher energy capturing and converting efficiency than the fixed-speed system, new proposals for wind power system utilize variable-speed generators are introduced, among which permanent-magnet synchronous generator(PMSG) is an attractive choice. This paper describes a sensorless vector control strategy for a direct-driven PMSG, which is connected to the power...
On the base of studying on existing wind farm models in power flow calculation, two improved power flow algorithms for power system including wind farm which may be composed of squirrel cage induction generators (SCIG) or doubly-fed induction generators (DFIG) are presented in this paper. Since reactive power of wind farm is rectified synchronously in every power flow iterative process, the improved...
HVDC Light system based on voltage source converter connecting large-scale offshore wind farm is illustrated in the paper. The simulation system is built on the basis of power control algorithm, implementing the independent control on bilateral-side converters. On wind turbine side, there are multiple wind generators with respective converter, adopting the power control method based on hysteresis...
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