Power Flow Control of a Single Distributed Generation Unit

Abstract

This research addresses power flow control problem of a grid-connected inverter in distributed generation applications. A real and reactive power control solution is proposed on the basis of an existing voltage control strategy developed for island operations. The power control solution takes advantage of a newly designed system parameter identification method and a nonlinear feedforward algorithm, both of which are based on Newton-Raphson iteration method and implemented in real time. The proposed power control solution also performs grid-line current conditioning and yields harmonic free grid-line current. A phase locked loop based algorithm is developed as a part of the solution to handle possible harmonic distorted grid-line voltage and maintain harmonic free line current. The effectiveness of the proposed techniques is demonstrated by both simulation and experimental results.

Review of Multifunctional Inverter Topologies and Control Schemes Used in Distributed Generation Systems

“…Single-phase and three-phase VSIs coupled with isolating transformers are often preferred to ensure galvanic isolation and alter the output voltage value [129], [149]- [152]. In [153], a linear model in the stationary frame was developed for a VSI connected to the utility grid through ∆-Y and Y-Y transformers.…”

Control and protection of power electronics interfaced distributed generation systems in a customer-driven microgrid

“…9, a proportional controller are used for the real and reactive power controllers to realize the real power versus system frequency (P-ω) droop and the reactive power versus voltage magnitude (Q-V) droop characteristics [3,18]. However, to improve the reactive power control accuracy in grid-connected operation mode, integral control can be included into the reactive power controller [12,21,22].…”

Corrective Measures for the Effective Load Management and Control Under Disturbance at Bhusawal Thermal Power Station: Case Study

“…In small grids with high proportion of nonlinear and unbalanced loads, it is also important to actively control the waveform quality in terms of harmonics, transient disturbances, and balance. A flexible active power control based on a fast current controller and a reconfigurable reference current selector is proposed in the literature [6], whereas, the power flow control problem of a grid connected inverter in DG applications is given in the article [7]. A real and reactive power control solution is proposed on the basis of an existing voltage control strategy developed for island operations.…”