Abstract
To reduce the impact of the imbalance of mixed non-linear loads on an inverter voltage output in the microgrid, we improve the disadvantage of the lack of damping and inertia for traditional droop control. This paper proposes a comprehensive virtual synchronous generator (VSG) control strategy for harmonic suppression and imbalance suppression of a multi-inverter parallel microgrid. On one hand, an improved VSG control strategy is proposed to increase the damping and inertia of distributed generations (DGs) in the microgrid, and secondary control is introduced to improve system stability. On the other hand, the frequency division suppression control strategy is used to eliminate the influence of harmonics, and the negative sequence component is compensated to eliminate the influence of imbalance. Then small-signal analysis is used for analysis of the stability of the strategy. Finally, we verify the comprehensive control strategy proposed in this paper through experiments. The experimental results suggest a significant improvement on the voltage, frequency, power optimization, handling of non-linear load and capacity distribution precision, as well as providing inertia support for the system.
Highlights
Scholars recently proposed that the microgrid has become an essential form of multipledistributed generations (DGs) integration, which is an important complementary of a traditional power network via inverters [1,2]
Scholars proposed a virtual synchronous generator (VSG) technology with the characteristics of self-balancing feasibility, rotational inertia and droop characteristics of a synchronous machine, that can be used in DGs and microgrid inverter control to improve system stability [6,7,8,9,10]
Numerous studies on using a VSG control strategy for renewable energy have been conducted, they rarely consider the power quality problems caused by the imbalance mixed non-linear loads for the microgrid
Summary
Scholars recently proposed that the microgrid has become an essential form of multipleDGs integration, which is an important complementary of a traditional power network via inverters [1,2]. [12] proposed using a VSG control strategy in microgrids, which improves the closed-loop system dynamic response without changing the frequency accuracy compared to traditional droop methods. In [13,14], VSG provides virtual damping and inertia to realize the dynamic frequency regulation during the short period in a microgrid, respectively These studies take advantage of a VSG to enhance the stability and reliability of a microgrid; in [15], a simplified VSG virtual inertia controller is introduced by Zhang B. [16] proposed a data-driven virtual synchronous generator (VSG) optimization control strategy, enabling DGs to adjust their control variables, according to current observations in a model-free manner, control system frequency and power dynamics. Numerous studies on using a VSG control strategy for renewable energy have been conducted, they rarely consider the power quality problems caused by the imbalance mixed non-linear loads for the microgrid
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