Study on the Influence of Power Grid Operation Mode on Wind Power Consumption in CHP System

Abstract

With the wind power grid-connected capacity and the amount of curtailment continue to increase, influence factor analysis of wind power consumption becomes more active. Firstly, this paper analyzes the wind power curtailment mechanism affected by power grid operation mode in CHP system. Then, an optimal dispatch model of the CHP system is established. It includes power and heat network security constraints, units' operating states, power network topological changes and the penalty cost of electric & heat load loss. Finally, this paper analyzes the influences of power grid operation mode on wind power consumption by case simulations. Study shows the reason for wind power curtailment is not always single in a dispatch cycle. The CHP unit thermo-electric coupling constraints and power network safety constraints may alternately or simultaneously cause wind power curtailment. The unit startup plan and the power network topology all affect the reasons, the periods and the rate of wind power curtailment. In addition, the changes of grid operation mode due to quit equipment in different periods also affect the wind power curtailment rate. Meanwhile, the amount can be reduced by prioritized starting standby units in plant which occurs unit shutdown, and putting in standby transmission lines near the wind farm