Abstract: In the power system of offshore oilfield group,there are usually high voltage slip rings,networking transformers,submarine cables,generators and other equipment which are prone to overload faults. The active power flow control strategy of marine power grid based on the analysis of hot spare proportion calculates and analyzes the hot spare allowance of relevant equipment,and takes the hot spare proportion as the regulation parameter to control the active power flow of the power grid,so that the hot spare allowance of each weak link of the power grid is relatively balanced,so that the power grid has a relatively optimized anti-fluctuation ability. The hot spare ratio control mode makes the regulation and control of marine power grid with insufficient multi-node hot spare more automatic and reduces the workload of power grid dispatch personnel in data analysis and calculation. The hot spare proportion control mode can be used together with the common dispatching mode and equal proportion distribution mode of the power grid,which can maintain the stability of the power grid while increasing the diversity of power grid regulation.

Key words: hot standby power, marine power grid, power flow control, power grid dispatching, control strategy