Coordinated control of multi‐functional grid‐tied inverters using conductance and susceptance limitation

Abstract

Owing to the numerous non-linear and reactive local loads, the applied grid-tied inverters etc., the quality of power supply of micro-grids becomes a challenging issue need to be highly addressed. As the power quality can significantly affect the secure, stable, effective and economic operation of the micro-grids, the compensation of the harmonic and reactive current in the micro-grids by the use of power quality conditioners and/or advanced control strategies has been highlighted. In this study, the multi-functional grid-tied inverters (MFGTIs) are attempted to interface renewable energy resources and enhance the power quality within the micro-grid. The MFGTIs encompassed with the coordinated control strategy based on the Fryze-Buchholz-Dpenbrock (FBD) theory. Through limiting the harmonic and reactive conductance and susceptance detected by FBD theory, the harmonic and reactive current within the micro-grid can be shared among the MFGTIs in a coordinated and automatic fashion in accordance with their capacities without communication. A set of the experiments based on the microgrid test-bed are carried out and the results confirm the effectiveness and feasibility of the suggested control strategies.

Analysis and Design of PI Plus Repetitive Control for Grid-Side Converters of Direct-Drive Wind Power Systems Considering the Effect of Hardware Sampling Circuits

“…To investigate the impact of the RC filter circuits, the Bode plot of G extra (s) is plotted in Fig. 6 based on (7). According to the magnitude-frequency response curve, G extra (s) is similar to an HF bandpass filter with considerably high gain, which expands the inherent resonance peak and leads to HF harmonic amplification.…”

“…This equipment injects large amounts of harmonic currents into the grid and consumes reactive power, which causes harmonic pollution and results in a poor power factor [5], [6]. Hence, considering the residual capacity of wind power and the power quality issues of the utility grid, a gridside converter can be designed to address the power quality issues by adding auxiliary functions such as active filtering, reactive power compensation, and dynamic stability enhancement [7], [8].…”

Distributed Voltage Unbalance Compensation in Islanded Microgrids by Using a Dynamic Consensus Algorithm

“…In [13], a central power sharing and voltage regulation method is proposed for achieving both the accurate power sharing and enhanced voltage quality in terms of harmonics, disturbances and unbalances, and the compensation commands are distributed to localized DGs through low bandwidth communication links (LBCL). Similar functions are also realized and discussed in [14]- [21] by properly controlling and coordinating the operation of power converter interfaced DGs. Moreover, in order to make DGs share the total power considering both negative sequence quantities and harmonic currents, several methods have been studied.…”

“…However, under distributed generation, storage and consumption paradigm, centralized control is facing obstacles because of the high communication and implementation cost, limited flexibility and low reliability due to its single point of failure feature. In order to achieve better power quality as well as reactive power and harmonic current sharing, a coordinated control strategy based on detecting and limiting the harmonic and reactive conductance and susceptance by using Fryze-Buchholz-Dpenbrock theory is proposed in [14].…”

A Novel Multi-Function PV Micro-Inverter with an Optimized Harmonic Compensation Strategy

“…Furthermore, the ACA will introduce new harmonic currents to the grid. Zeng Z. et al have proposed a coordinated control strategy based on the Fryze-Buchholz-Dpenbrock (FBD) theory [22]. By limiting the harmonic and reactive conductance and susceptance, the inverters can cooperate in accordance with their capacities without communication.…”