During heating period in winter, in order to meet the heating requirements, Combined Heat and Power (CHP) units are operated in the mode of “power determined by heat”. The capacity of peak-load regulation is poor, and a large number of wind power is abandoned in the low load period. In order to study the problem, the characteristics of CHP units are analyzed, and the relevant research results at home and abroad are summarized. From the aspects of adding thermoelectric coupling equipment and grid lean dispatching, the schemes of increasing electric boiler, heat pump and heat storage are analyzed, the lean dispatching methods of the power grid for the CHP units are mentioned, and the practical application of the decoupling for thermoelectric coupling constraints at home and abroad is expatiated. Finally, the next step work that need carrying out in the power side and the grid scheduling side is pointed out. This work is supported by National Key Research and Development Program of China (No. 2017YFB0902100).