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This paper presents an output power smoothing method by a simple coordinated control of DC-link voltage and pitch angle of a wind energy conversion system (WECS) with a permanent magnet synchronous generator (PMSG). The WECS adopts an AC-DC-AC converter system with voltage-source converters (VSC). The DC-link voltage command is determined according to output power fluctuations of the PMSG. The output...
Nowadays, a wind turbine generator (WTG) is required to provide control capabilities regarding an output power. Under this scenario, this paper presents a frequency control method by coordination control of the WTG and a battery using load estimation by a disturbance observer for isolated island. The load variation is reduced by the WTG using pitch angle control in low frequency domain and the battery...
This paper presents a frequency control method by coordination control of a wind turbine generator (WTG) and a battery using H∞ control theory. The output command of the WTG is based on wind speed conditions and the output is controlled by pitch angle control system using H∞ controller. H∞ control is also used in the output command system of the battery which is determined according to the frequency...
To reduce the impact of large output power fluctuations of a wind power generator introduced in a power system usually, a battery is installed. However, if a large battery is used, the capital cost of wind turbine system will increase. Hence the smaller size of battery is preferable to reduce capital cost. This paper presents a methodology for controlling the combined output and the battery storage...
This paper deals with a DC-micro grid in an isolated island. The proposed method is composed of gearless wind power generation system, battery, and DC loads in DC distribution system. The battery can avoid DC over-voltages by absorbing the PMSG power during line-fault. In addition, the control schemes in this paper include the maximum power point tracking (MPPT) control and a pitch angle control for...
Currently, there are several published reports on wind power detailing various researches based on such subjects as pitch angle control, variable speed wind turbines, energy storage systems, and so on. These reports propose output power leveling to reduce the adverse effects of power system frequency deviation. In this context, it is desirable to decrease frequency deviations of power systems by output...
Due to the large output power fluctuations of a wind power generator, a battery is installed to smooth these fluctuations. However, if a large battery is installed in the power system, the capital cost for wind power system will increase. Hence the smallest size of battery is preferable to save on capital cost. In this paper, we propose a methodology for controlling combined system output and optimal...
This paper proposes stable operation strategies for gearless wind power generation systems using permanent magnet synchronous generator (PMSG) under line fault. The proposed method uses a chopper circuit in DC-link circuit for gearless wind power generation system. This chopper circuit can avoid DC-link over-voltages under line fault. In addition, the control schemes in this paper include the maximum...
Nowadays, wind turbine generator (WTG) is increasingly required to provide control capabilities regarding output power. Under this scenario, this paper proposes an output power control of wind farm (WF) using pitch angle control connected to small power systems. In this control approach, WF output power control is achieved by two control levels: central and local. In central control, WF output power...
Nowadays, wind turbine generator (WTG) is increasingly required to provide control capabilities regarding output power. Under this scenario, this paper proposes an output power control of WTG using pitch angle control connected to small power systems. By means of the proposed method, output power control of WTG considering states of power system becomes possible, and in general both conflicting objectives...
Effective utilization of renewable energies such as wind energy is expected instead of the fossil fuel. Wind energy is not constant and windmill output is proportional to the cube of wind speed, which cause the generated power of wind turbine generators (WTGs) to fluctuate. In order to reduce output power fluctuation of wind farm, this paper presents a output power leveling control strategy of wind...
Effective utilization of renewable energies such as wind energy is expected instead of the fossil fuel. Wind energy is not constant and windmill output is proportional to the cube of wind speed, which cause the generated power of wind turbine generators (WTGs) to fluctuate. In order to reduce output power fluctuation of wind farm, this paper presents a output power leveling control strategy of wind...
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