Research On The Mechanism Of Distributed Generation Participating In Power Auxiliary Service

With the continuous promotion of the global energy Internet strategy,the distributed generation represented by wind power and photovoltaic will be connected to the power grid on a large scale,which is difficult to connect to the grid due to its geographical dispersion,random volatility and other characteristics.The application of virtual power plant technology in ubiquitous power Internet of thingsmakes it possible to aggregate distributed generation to participate in the power auxiliary service market,which can effectively improve the penetration and utilization rate of distributed generation,while avoiding the construction of a large number of conventional peak shaving units.In order to understand the development of distributed generation in China,factor analysis and information entropy method was used to analyze the consumption level and structure evolution of renewable energy generation in China,and the development level of distributed renewable energy was studied.The results show that the type structure of renewable energy in China tends to be diversified,but the mismatch between the installed capacity and the generation capacity of renewable energy is becoming increasingly prominent.With the improvement of production technology,the reduction of cost and the increase of market demand,it is possible for the distributed generation to participate in the power market at a fair price.Peak load regulation is one of the most common forms of distributed generation participating in auxiliary services.In this paper,virtual power plant as the main form of distributed power participating in peak load regulation auxiliary services,the feasibility,economy and scheduling mechanism of distributed generation participating in peak load regulation auxiliary services were studied in detail.In this paper,distributed wind power and photovoltaic,gas turbine,energy storage system and controllable load are brought into the peak load regulation resources in the form of virtual power plant,and a rational peak shaving model of distributed power supply participating in power auxiliary service was established.The improved IEEE 30 node system was selected,and the operation cost and the absorption degree of distributed wind power and photovoltaic were calculated by using the membrane algorithm based on the distribution estimation under three different combination modes.The results show that the rational absorption and peak shaving mode of distributed generation can make more efficient use of peak shaving resources,and realize the win-win situation of renewable energy absorption and peak shaving system economy.In order to meet the needs of clean and low-carbon transformation of energy,in this paper the construction of carbon emission trading market in China was combined,the cost of pollutant emission was taken into account,and a peak shaving model of distributed generation participating in auxiliary services under the constraint of carbon emission was proposed.According to the principle and experience of carbon emission right quota system,three different scenarios of carbon emission right restriction were established,and the peak shaving cost and environmental benefit of the system under three scenarios was analyzed by using the membrane algorithm based on distribution estimation.The results show that the constraint of carbon emission right will lead to the change of output of peak shaving system to reduce carbon emission,but within a certain range,the carbon emission of the system will not change with the change of constraint,and there is a certain space for free carbon emission right constraint;the quota of carbon emission right will affect the economic cost of peak shaving system,and the distribution of carbon emission right should follow the principle of fairness and efficiency.