The use of non-synchronous automatic reclosing in power plants of large industrial enterprises with a complex network configuration

One of the main trends in industrial energy is the use of various sources of distributed generation. This is due to the low cost of its own generated electricity and increased reliability of electricity supply to industrial consumers. However, the introduction of objects of distributed generation leads to a significant complication of operating conditions. In particular, it is not excluded the output to the separate work with the power system. This paper focuses on the restoration of synchronous parallel operation with the power grid. Two types of non-synchronous automatic reclosing were investigated: fast-reclosing and switching on at different frequencies. An algorithm has been developed for the operation of non-synchronous automatic reclosing under conditions of distributed generation objects. The conditions under which it is advisable to use this type of automation in industrial power plants are determined. A software package for calculating transient electromechanical processes has been developed, which allows investigating the modes of resynchronization of generators with a network. Studies were conducted on the example of an industrial power plant of complex configuration. Calculations showed that the success of resynchronization depends on the network configuration, unbalance of power in the node and power of the generators. The developed algorithm allows determining the possibility of using asynchronous automatic reclosing at a power plant and developing recommendations for its use.