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A multi-functional distributed generation unit (MFDGU) and its control strategy are proposed in this study for the purpose of enhancing power quality in low-voltage networks. By using the 3H-bridge converter structure, an MFDGU can be applied in 3-phase 4-wire low-voltage distribution networks to compensate harmonic, reactive and unbalanced currents. A reduced-order model of the MFDGU is derived through...
Tremendous air-conditioner loads already have significant impact on the operation safety of Chinese distribution system. In the view of demand response, this paper aims to enhance distribution system voltage stability by improving inverter air-conditioners dynamic characteristics under power system short-term fluctuations. First of all, an inverter air-conditioner load model based on dynamic phasor...
In this paper, virtual synchronous generator (VSG) theory is investigated and utilized to control parallel inverters in a micro-grid, which is capable of sharing the local loads without communication lines. The mathematical model of VSG is built to describe the electromagnetic and mechanical characteristics of a synchronous generator. To make the model suitable for parallel inverters application,...
This paper simplified the classical transient energy function based on center of inertia, improved the classical indicators of the stability margin, and put forward the indicator of the stability margin increment The indicator was established on the basis of the tie-line observational section in power system, and the calculation was simple and convenient, not only achieving early warnings of low frequency...
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