Abstract
This paper proposes a coordinated voltage regulation method for active distribution networks (ADNs) to mitigate nodal voltage fluctuations caused by photovoltaic (PV) power fluctuations, where a three-stage optimization scheme is developed to coordinate and optimize the tap position of on-load tap changers (OLTCs), the reactive power of capacitor banks (CBs), and the active and reactive power of soft open points (SOPs). The first stage aims to schedule the OLTC and CBs hourly using the rolling optimization algorithm. In the second stage, a multi-objective optimization model of SOPs is established to periodically (15 min) optimize the active and reactive power of each SOP. Meanwhile, this model is also responsible for optimizing the Q-V droop control parameters of each SOP used in the third stage. The aim of the third stage is to suppress real-time (1 min) voltage fluctuations caused by rapid changes in PV power, where the Q-V droop control is developed to regulate the actual reactive power of SOPs automatically, according to the measured voltage at the SOPs’ connection points. Furthermore, numerous simulations and comparisons are carried out on a modified IEEE 33-bus distribution network to verify the effectiveness and correctness of the proposed voltage regulation method.
Highlights
In recent years, environment protection and sustainability have become the main concern across the whole world
The capacitor banks (CBs) correspondingly reduce their reactive outputs to avoid the bus voltage exceeding the upper voltage limit. These results show that the developed optimization model of the on-load tap changers (OLTCs) and CBs based on the rolling optimization algorithm can correctly regulate their operation status and reduce their changing times
A coordinated three-stage voltage regulation method for active distribution networks (ADNs) is proposed to mitigate nodal voltage fluctuations caused by PV power fluctuations, where the active and reactive power of soft open points (SOPs), the OLTC tap position, and the reactive power compensation of CBs are optimized in the distribution network level
Summary
Environment protection and sustainability have become the main concern across the whole world. Using OLTCs and CBs is hard to fully solve the voltage issues of ADNs caused by active power fluctuations of high levels of PV. To solve this problem, the active power of PV plants can be reduced to avoid bus voltages exceeding upper voltage constraints, but it will reduce the revenue of selling solar power [10,11]. The optimization of active and reactive power distribution of ADNs should be considered simultaneously to make full use of the advantages of various voltage control methods and devices, achieving a better voltage regulation result
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