In this paper a new variable speed permanent magnet synchronous generator (PMSG)-based stand-alone wind energy conversion system (SWECS) is proposed. The interface between the PMSG and the isolated load is accomplished by a quasi-Z-source inverter (qZSI) with battery storage system. The battery-assisted qZSI can balance the stochastic fluctuations of the wind power injected to the load and improve the voltage and frequency control. In addition to the battery storage, a dump load is used in the proposed SWECS to better maintain the active power balance and stability of the dc-link voltage during over-generation condition as well as sudden load changes. The proposed control system is able to provide an uninterrupted and reliable supply to sensitive loads under various power generation scenarios of the SWECS and sudden changes in the load demand. Moreover, the proposed controller provides maximum power point tracking (MPPT) which is essential for optimum operation of the SWECS. The validity of the proposed system is proved by simulation results carried out using MATLAB/ SIMULINK.

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Control of a new stand-alone wind turbine-based variable
speed permanent magnet synchronous generator using
quasi-Z-source inverter
ABSTRACT:
In this paper a new variable speed permanent magnet synchronous generator (PMSG)-based
stand-alone wind energy conversion system (SWECS) is proposed. The interface between the
PMSG and the isolated load is accomplished by a quasi-Z-source inverter (qZSI) with battery
storage system. The battery-assisted qZSI can balance the stochastic fluctuations of the wind
power injected to the load and improve the voltage and frequency control. In addition to the
battery storage, a dump load is used in the proposed SWECS to better maintain the active power
balance and stability of the dc-link voltage during over-generation condition as well as sudden
load changes. The proposed control system is able to provide an uninterrupted and reliable
supply to sensitive loads under various power generation scenarios of the SWECS and sudden
changes in the load demand. Moreover, the proposed controller provides maximum power point
tracking (MPPT) which is essential for optimum operation of the SWECS. The validity of the
proposed system is proved by simulation results carried out using MATLAB/ SIMULINK.
KEYWORDS:
1. Permanent magnet synchronous generator (PMSG)
2. Stand-alone wind energy conversion system (SWECS)
3. Quasi-Z-source inverter (qZSI)
4. Battery storage system
5. Dump load
6. Maximum power point tracking (MPPT)
SOFTWARE: MATLAB/SIMULINK

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CONCLUSION:
This paper proposes a new stand-alone PMSG-based WECS using battery-assisted qZSI. The
proposed battery-assisted qZSI provides the voltage boost and inversion, and energy storage in a
single-stage. By introducing the dynamic model of the qZSI with battery, a closed-loop control
scheme for both dc-side and ac-side of the qZSI was presented. The magnitude and frequency of
the output voltage were effectively controlled through the proposed control scheme under
variable wind profile and load conditions. The battery storage system located on quasi-Z-source
network balances the stochastic fluctuations of the wind power injected to the load and
guarantees an uninterrupted and stable power supply. On the other hand, using a dump load in
the proposed system can ensure the stability of the dc-link voltage under over-generation
condition of the SWECS. Lack of the dump load makes power balance difficult and can lead to
voltage and frequency instability in the over-generation condition, especially when the battery
reaches its maximum capacity. The dc-side controller adjusts dsh to manage the battery operation
mode and maximum power extraction from the wind. Simulation results verify the performance
of the proposed control scheme.
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3. ELECTRICAL PROJECTS USING MATLAB/SIMULINK
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