Research on distributed PV consumption control method

The traditional distribution network has been developed into a new distribution network with multi-power supply, bidirectional power current and a large number of new power electronic equipment access, after large number of distributed resources such as photovoltaic, wind power and energy storage are connected to the medium and low voltage distribution system. The active power of distributed generators such as photovoltaic wind generators is greatly affected by meteorological factors and has strong randomness and volatility, which brings difficulties for the safe and stable operation control of the active distribution networks. Sometimes photovoltaic or wind generators have to be decreased output or even given up, which reduces the economy incomes of DGs’ owners and reliability of distribution system. To solve this problem, an operational control method has been proposed to improve the load-bearing capacity of the distribution system in this paper . The method aims to maximize the consumption ability of distributed generators, and establishes an active power coordination control model for distribution system meeting with the safe operation constraint. This model has the characteristics of multi spatiotemporal comprehensive optimization and it is a multidimensional comprehensive optimization method. In terms of time dimension, it is divided into day-ahead strategy optimization, intraday ultra short-term strategy optimization, and real-time control optimization. In terms of space dimension, it is divided into three levels: regional autonomy, inter regions collaboration, and global optimization. The specific implementation method is as follows: regional autonomy includes coordinated control of distributed energy sources such as photovoltaic generators, wind power generators, and energy storage systems within one MV/LV transformer supplying area to achieve power autonomy within the MV/LV transformer supplying area, flexible interconnection of the low-voltage areas power supplied by the distribution transformers within one MV feeder to achieve flexible mutual power exchanging within the MV transformers, and coordinated control of distributed energy sources within the feeder supply area to achieve the feeder autonomy. Inter regional collaboration refers to the power balance and collaboration among various feeders within the scope of the group of feeders tied, which is achieved through network reconfiguration and coordinated control of distributed energy sources . Global optimization realizes the DERs’ daily output planning and real-time output adjustments for the distribution system, and sends them to the corresponding control center.