Abstract
The paper presents a decoupled direct power-controlled (DPC) of a doubly fed induction generator (DFIG) connected to an unbalanced power grid, executed in an orthogonal stationary reference frame related to the stator side. The control allows to maintain constant electromagnetic torque despite stator connection to the unbalanced power grid and to achieve controllable low-voltage ride through (LVRT) capability. The control does not require any signal decomposition into positive and negative sequence order, which allows to reduce its complexity and computational requirements. Then, the paper presents positive influence of rotor current feedback in the stator-controlled reference frame on control performance. It facilitates significant transient reduction and minor steady state control improvement. All the mentioned functionalities were validated both in simulation and in laboratory conditions and the obtained results are described in the paper.
Highlights
Rapid growth of electric power generation connected with renewable energy sources (RES) has forced power grid operators to impose some new operation regulations on these units
The converter consists of two three-phase voltage converters, the one connected to the rotor is called the rotor side converter (RSC), whereas the other connected to the grid—the grid side converter (GSC)
Showing transient performance of asymmetrical rical grid voltage drop without the feedforward, decoupling mechanism and information aboutabout the the rotor grid voltage drop without the feedforward, decoupling mechanism and information rotor current value included in the control, Qsrefref= 0, Temref =ref−19.5 Nm
Summary
Rapid growth of electric power generation connected with renewable energy sources (RES) has forced power grid operators to impose some new operation regulations on these units. These regulations are called Grid Codes [1,2]. The nominal power of the B2B converter for which it is usually designed varies from 1/4 up to 1/3 of the whole total nominal set-up power
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