An Adaptive Control in a LV Distribution Network Integrating Distributed PV Systems by Considering Electricity Substitution

Abstract

AbstractDistributed photovoltaic and electric energy substitution are two crucial technologies for building a clean energy system where electricity contributes a great support for responding to national strategic goals of “rural revitalization”, “carbon peak” and “carbon neutrality”. However, PV generation features with volatility and randomness while electricity substitution further brings about higher peaks so as to affect the reliability of power supply. There is an urgent need for developing adaptive control strategies for distributed photovoltaic grid-connected, especially in low-voltage distribution networks. This paper firstly studies the topology of a low voltage distribution network with specific parameters. Afterwards, by taking into account the operational costs of the power grid and the safety issue of the equipment, a two-stage control architecture of “concentration-in-place” is proposed. Furthermore, the imbalance of three phase power systems, network losses, transformer losses are considered to form a multi-objectives optimization problem which is solved by tuning voltage, power output from PV system, energy storage and demand side response schemes. By integrating actual parameters in the model, the effectiveness of the proposed methods are validated, where the data is from the local networks in Bijie region in Guizhou province. The results show that the network loss and three-phase imbalance can be effectively relieved. In addition, the voltage fluctuation and overstay caused by photovoltaic and load fluctuations can be mitigated accordingly.KeywordsLow-voltage distribution networkDistributed photostaticPower substitutionAdaptive controlTwo-stage control