Research On Pricing Of Peak-valley For Motivating Cchp To Participate In Demand-side Management

CCHP system(Combined Cold Heat and Power, CCHP) can provide users with various forms of energy, to achieve cooling, heating and power integration. With high energy utilization efficiency, reduce emissions of polluting gases, flexible energy supply and many other advantages, which can effectively alleviate the energy crisis and reduce environmental pollution. CCHP system connected to the grid runtime, with operating characteristics that not only purchase electricity from the grid, but also the sale of electricity as a supplement to grid, which can make it under the electricity price incentives effectively improve grid bus load curve, actively participate in demand-side management.For the analysis of CCHP system of response characteristics under fixed price and different peak valley price, through CCHP systems optimized economic dispatching model, which consisting of the purchase or sale of electricity costs and the fuel costs and the maintenance costs, to obtain different optimal energy supply scheme, especial a different purchase or sale of electricity trading scheme. That significantly changed the load curve of grid buses. Selected daily load rate and minimum load factor as the evaluation index of load curve trait. To judgment the changes degree of access bus load curve character after CCHP system response electricity prices, the results of optimal operation simulation with fixed price and different peak-valley price, show that the implementation of peak-valley price improve CCHP system economy, and the evaluation index of load curve trait, the effect of improvement increased with the peak-valley price difference.TOU is effective measures to motivate users to participate in load shifting Due to the operating characteristics of CCHP system, for which the bidirectional peak-valley pricing will be more effective. An error based on the least squares method to depict the relative value of the deviation from mean of daily load, and the rate of change of the error is defined as the load curve satisfaction; comparing economic differences of CCHP under the condition of uniform price and peak-valley price, and then defining CCHP satisfaction. In order to consider the effect of adjustment for CCHP system, established pricing model of peak-valley with the aim of joint satisfaction of power grid and CCHP system. Simulation results show that the bidirectional peak-valley prices decision-made reasonably can promote the CCHP system to adjust dispatch schedule, and obtain improvement of load curve of substation bus. Comparing joint satisfaction model of TOU with different weights, which with balancing weights one, CCHP system responses more actively, peak load shaving effects more available.In conclusion, the CCHP system connected to the electricity grid runtime has obvious response to the peak valley price, and in response to different degrees in different price, determined by balancing the weight of the joint satisfaction of TOU pricing model can be an effective incentive CCHP system to participate in demand side management, power gird and CCHP system achieve win-win situation.