Study On The Capacity Of Central Heating And Electric Heating Based On Thermal Scheduling To Consume Wind Power

With the rapid development of modern society, people pursuing higher quality of life is accompanied with quickly consuming a lot of energy, and the resulting environmental problems can not be ignored. To ease the global energy crisis and environmental pressure, wind power has been developed rapidly. Our country has abundant wind energy resources and also accelerates the pace of wind power construction, in recent years, the wind power installed capacity continues to rise. However there are a lot of problems in the process of development, as far as our country is concerned, the problems of abandoned wind is particularly serious caused by the shortage of accommodating wind power.In the "Three North" region of our country, there are not only a large scale of wind power generators, but also a high proportion of the cogeneration units. Especially in the winter heating period, the heat and power units are used to central heating, and the output power is constant. The units have a limited peak ability, so we have to frequent change the output of the conventional thermal power unit to adjust the wind power grid. In this paper, the central heating system is set as the research object to study the wind power grid connected with the heating system. The model takes the maximum wind power in the power grid as the target, considered with the minimum output of conventional thermal power units and the climbing constraint. The author analyzed the wind power accommodated situation rely on power balance method, and pointed that he power grid can accept a certain amount of wind power, but the wind power generation rate is closed to 10% due to the wind power output fluctuations.The authors propose a new type of combined heat and power dispatching model, which increases the electric heat pump on the central heating system. By changing the heat electricity ratio of heating units to fill the shortage of wind power, and consume the wind power peak to compensate heating, in order to achieve smooth wind power. The model takes the minimum standard deviation of adjusted wind power output fluctuation as the target, increasing the output constraint and climbing constraint of the pumping steam cogeneration unit, as well as the delay time and the thermal inertia time of the heating water and other factors. By an example analysis, we got the wind power consumptive situation, the matching relationship between central heating and electric heating, and the temporal and spatial distribution of wind power heating. The results show that using the new method under the premise of ensuring the power balance and heat load balance can effectively weaken the fluctuation of wind power, wind power used for heating except for grid and the rate of abandoned wind is almost zero. Besides, the ratio between central heating and wind power heating is close to 1:1. So the method can not only effectively reduce the wind power output fluctuation, make the wind level stable to reduce the wind power, but also can consume the surplus wind power for the heating of the heat users, ease the pressure of central heating. At the end of this paper, the author analyzed the influence of different heat pump performance coefficient on the power plant side and the user side, and pointed that changing the performance coefficient of the heat pump in different positions has the opposite results for heating.