Power System Operation Optimization Method of Combined Renewable Energy with Thermoelectric Units Considering Exergy Efficiency

In northern China, the demand for winter heating is substantial, leading to a high proportion of heating loads that reduce the flexibility of the power grid in regulating power generation. The pure condensing unit will enter the normal operation condition of ultra-low load (sometimes even undergoing daily start and stop cycles). The economic consumption method of light, electricity, and heat balance of combined heat and power units is proposed. Based on considering the exergy efficiency, the new energy is transferred to the heat load of the heating network to break the fixed mode of “fixing electricity by heat, “reduce the light abandonment rate, and improve the operation economy of the system. It has certain reference significance for promoting the safe and efficient consumption and utilization of local large-scale renewable energy.