Control and power transfer operation of WRIG‐based WECS in a hybrid AC/DC microgrid

Abstract

In this study, the control and power transfer operation of wound rotor induction generator (WRIG)-based wind energy conversion system (WECS) in a hybrid AC/DC microgrid (DCM), delivering power during islanded and utility-tied conditions are dealt. The system encompasses WRIG, rotor-side converter (RSC) and stator SC (SSC) connected back-back with DCM. AC loads, AC end of SSC, stator of WRIG and a switchable utility frames the AC microgrid. During islanded mode, stator voltage and frequency are regulated with proportional-integral (PI) controllers through RSC. During utility-tied mode, RSC is currently controlled to perform bidirectional slip power transfer. Load compensation is achieved by current-controlled SSC at all conditions. Instantaneous power theory is employed in the current control of RSC and SSC for generating reference currents. On the basis of wind/load conditions, all possible operational modes are formulated. The power transfer operation during occasional conditions such as shorted winding, over loading, low wind, machine stall and no load claims the merit of the setup. A supervisory control algorithm is developed for executing smooth power transfer. The dynamic operation is experimentally analysed to confirm the efficacious working of the WECS.

Providing a control method of BTB-VSC Converters under unbalanced faults

“…The former requires a communication network to support the necessary interaction between DGS. Some routine centralized/distributed coordinate control methods for DG were proposed in the literature [15]− [24], which include the consensus synchronization control through the state feedback control [22]− [24], the distributed cooperative adaptive control [18], [20], the centralized proportionalintegral (PI) compensation control [21]− [23], and the synchronization signal injection control [24].…”

Bulletin of the Polish Academy of Sciences: Technical Sciences

“…1. Network equivalent circuit with impedances of inverter coupling and line Since the previous approaches necessitate the communication link to support the required coordination among RESs, different centralized and distributed coordination control strategies have been schemed and proposed for microgrids in [21][22][23][24][25][26][27][28][29][30], that contain: unity synchronous control owing to the state-feedback controller [21][22][23][24], the distributed cooperative-adaptive voltage-frequency controller [25,26], the centralized compensative controller [27,29], and synchronous signal-producing controller [30]. To attain almost independent communication, event triggered-communication strategy [31], two-layer intermittent-communication strategy [32], and the sparse-communication strategy [33] have been suggested.…”

Decentralised coordinated energy management for hybrid AC/DC microgrid by using fuzzy control strategy

“…On the other hand, the main distribution network is the AC grid and there are already a number of AC microgrids put into operation. Thus, the conception of hybrid AC/DC microgrid is a reasonable solution for the integration of various AC and DC sources and loads [3][4][5][6][7]. The AC DGs and loads can be allocated in AC subgrid and the DC subgrid can include DC renewable generators and DC loads.…”