Study On Energy-Saving Generation Dispatching Based On Carbon Trading Mechanism

Power industry with mostly thermal power in our country, is in high-speed development stage. In the increasingly energy-exhausted background, improving the energy utilization efficiency of power industry which consumes a lot of energy is urgently needed by the present energy policy of China.As an important component of power industry, the optimal dispatching of power system is an important way to realize energy conservation and emissions reduction in power industry. Low carbon economy has posed new challenges for the optimal dispatching of power system. At present, energy conservation generation dispatching of our country has played a positive role for the work of energy conservation and emission reduction, but it doesn't consider regulation of the market mechanism. The implementation of emissions trading scheme (ETS) will bring new changes to energy conservation generation dispatching in China and also affect energy conservation and emissions reduction of power industry. Take this as the background, the paper discusses the relationship of ETS and energy conservation generation dispatching and the mode of combination of electricity market and energy conservation generation dispatching in the new environment.Considering that thermal power units of China are mostly coal-fired units and the dispatching center can not directly obtain the function of coal consumption from the units, a new bidding transaction mode that can balance the energy conservation and emissions reduction is proposed. Because the CO₂ emission level has double meanings of emission index and energy-consumption index, according to the unit CO₂ emissions parameters, CO₂ emission per kilowatt-hour of every unit and average CO₂ emissions per kilowatt-hour of all units can be calculated, and the ratio of the two values can be as the modifying factor to modify the quoted price of the units, which can be used as the scheduling basis. An example shows that the proposed mode not only effectively controls generation-side CO₂ emissions, but also the units used advanced discharge reduction technology is scheduled first, so the social benefits of energy conservation and emission reduction are realized.Single minimizing and maximizing object functions are mostly used for the modeling and solution in optimization scheduling problem of power system, which doesn't meet the actual situation of the optimal dispatching of power system. Based on this situation, a multi-objective model of energy conservation generation dispatching is proposed in this paper, which is translated into single object model using maximum-satisfaction method and solved using particle swarm optimization (PSO) algorithm. This method can overcome the difficulty to get global optimal in general multi-objective optimization and the problems that the target weights are difficult to be determined in the translation process. The example of IEEE 39 node system shows that the fuzzy multi-objective model of energy conservation generation dispatching can realize both the generating-side CO₂ emissions reduction and the reduction of the grid corporation's purchasing cost, which has certain reference value for current energy conservation generation dispatching of China.Generation rights trade and ETS can promote energy conservation and emissions reduction in power industry, which bring both social benefit and CO₂ emissions reduction benefit for power industry. A short-term generation rights trade model with the goal of maximal social benefit is proposed, based on which a new short-term generation rights trade model considering ETS is proposed, and the special solving method is given. To let low-emission buying units and high-emission selling units have the priority of trading, CO₂ modifying factor is used to modify the quoted price in this paper. An example shows that the model proposed can bring greater CO₂ emissions benefits. After the implementation of ETS, the volume of generation rights trade and the social benefits are significantly increased, and CO₂ emissions benefit is also increased significantly, so the energy conservation and emissions reduction of power system are further realized.