The invention discloses a multi-energy complementary method considering user demand characteristics and energy utilization cost, which comprises the following steps: collecting the active output of thermal power units, the generating power of
wind power unit, the photovoltaic generating power, the generating power of
hydropower units and the load power; drawing a
wind power output curve, a photovoltaic
power output curve, a
hydropower output curve and a load curve; analyzing the energy output in different periods, and determining the
time series after combination of different energy accordingto the
time series of single energy; establishing an energy-load curve difference index, and determining the similarity between the
power output curve after combination of different energy and the load curve; establishing the evaluation indexes of an energy combination mode curve, including a
clean energy utilization rate index and an active power deviation index; calculating the
cost index of theenergy combination mode curve; and finally, calculating the effect factors of the indexes and the effect factors of different energy combination mode curves, and selecting an optimal multi-energy complementary curve. The problem that large-scale connection of
wind power and photovoltaic power into the grid affects the safety and stability of the power
system is solved.