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Nonlinear and time variant loads generate harmonic currents in power systems. Active filters (AF) are used to reduce the amplitude of these currents or omit them. Different control strategies have been presented for AF that among them the p-q theory is more popular. In this paper direct power control (DPC) method is used to implement the p-q theory. Active and reactive power of load and AF are measured...
An analysis and improvement of the direct power control method (DPC) for converter feeding generators in wind power applications under disturbed grid voltages is presented. An improved DPC method is derived and described, and its performance is analyzed as well. This improved DPC permits a robust and dynamic control of active and reactive power even under symmetrical and unsymmetrical voltage sags,...
This paper introduces a direct power control (DPC) method with narrowband disturbance rejection capability for the grid-connected doubly fed induction generator (DFIG). The method is suited for variable speed operation of DFIG, especially in wind energy conversion systems connected to weak networks where voltage unbalance is common. The control framework is based on the linear quadratic regulator...
The direct-drive permanent magnet synchronous generator (PMSG) wind power imitation platform is an essential requirement for its research, development and product test. It's more efficient and flexible to demonstrate control strategies including the wind turbine's maximum power point tracking (MPPT). Conventionally, many control strategies of the motor's speed or torque are used to implement the turbine...
In this paper, direct power control (DPC) method for voltage source converters is described, then a high performance constant switching frequency DPC technique for three-phase pulse-width-modulated (PWM) converters is developed. Hysteresis comparators and switching table are replaced by a PWM modulator and the required converter voltage in each sampling period is directly calculated based on reference...
Increasing from day to day application of rectifiers in electric motor drives and due to the advances in power electronic devices and microprocessors technology, The PWM rectifiers have received more attention in industry. To improve the performance of rectifiers, new control algorithms are proposed such as direct power control (DPC). DPC is a relatively new method and it could properly control the...
Now it is a trend that active rectifier is used to replace the traditional non-controlled diode bridge in AC-DC-AC industrial drive system. Though direct power control (DPC) of three-phase voltage type active rectifier has drawn more and more attention, conventional DPC results in variable switching frequency, and consequently the system may suffer undesirable harmonics and the input EMI filter may...
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