Research On Economics Of Accommodating Wind Power By CHP Based On Heat Accumulator And Peak Regulation Pricing

In recent years, curtailments of wind power become more and more serious in "Three North" area of our country along with the large-scale development of wind power. How to accommodate wind power has become a hot spot in current research. Installing a heat accumulator in CHP plant can be used as a feasible solution for accommodating wind power. Howerer, whether CHP plant installing a heat accumulator strategy has economic advantage compared with the two current common applied peak regulation strategies-wind power heating strategy and pumped storage strategy, has become the problem that need to be researched.In order to compare the three strategies, the models of evaluating the coal-saved effects and national economics are established, and the theory and analysis of examples are also carried out. The results show that:when wind power is curtailed seriously in "Three North" area of our country, three solutions all have good coal saving effect and national economy, but heat storage stragety has the least invest when offer 1MW accommodating space for wind power, and can save most coal when accommodating 1MW-h wind power:10%-20% that more than pumped storage stragety and about twice as wind power heating solution. Thereby, heat storage stragety has the best national economic index and the ability of risk tolerance for wind power uncertainty.In order to motivate CHP plant to install heat accumulator and then to trade with wind farm about peak regulation, this paper designed a peak regulation pricing mechanism. In view of peak regulation trading between CHP plant and wind farm, this paper analyzed the cost-benefit of cooperation in peak regulation, the way of investing and boundary price of each side from the whole and individual angle, proposed generation right pricing method within investment pay-back period and after investment pay-back period, used the methodology of VaR (Value at Risk) to describe the risk resulted from uncertainty of the curtailed wind power accommodation in the future. Finally, an example analyzed the factors influencing the cooperation in peak regulation. Studies show that, the reasonable peak regulation pricing method can motivate CHP plant to install heat accumulator actively in peak regulatin for accommodating wind power, achieve a win-win result between CHP plant and wind farm.This paper can provide reference for the choice of strategy to accommodate curtailed wind power. It can also be used as reference when CHP plant installing heating accumulator trade with wind farm.