Abstract
With the increasing expansion of wind power, its impact on economic dispatch of power systems cannot be ignored. Adding a heat storage device to a traditional cogeneration unit can break the thermoelectric coupling constraint of the cogeneration unit and meet the economic and stable operation of a power system. In this paper, an economy-environment coordinated scheduling model with the lowest economic cost and the lowest pollutant emissions is constructed. Economic costs include the cost of conventional thermal power generating units, the operating cost of cogeneration units, and the operating cost of wind power. At the same time, green certificate costs are introduced into the economic costs to improve the absorption of wind power. Pollutant emissions include SO2 and NOx emissions from conventional thermal power units and cogeneration units. The randomness and uncertainty of wind power output are fully considered, and the prediction error of wind power is fuzzy treated according to the fuzzy random theory, and the electric power balance and spinning reserve fuzzy opportunity conditions are established, which are converted into the explicit equivalent. The improved multi-objective particle swarm optimization (MOPSO) was used to solve the model. With this method, the validity of the model is verified by taking a system with 10 machines as an example.
Highlights
In recent years, the energy crisis, the greenhouse effect and air pollution have become more and more serious
The economic indicators of this paper take into account the cost of a conventional thermal power generating unit, the operating cost of a cogeneration unit, the operating cost of wind power and the cost of green certificates; the environmental indicators take into account the SO2 and NOx emissions of a conventional thermal power unit and a cogeneration unit
Where F is the economic cost of the system within the scheduling period T; FG is the economic cost of thermal power unit operation during the scheduling period T; Fe is the economic cost of cogeneration unit operation during the scheduling period T; Fw is the economic cost of the wind turbine operation during the scheduling period T; FR is the green certificate costs of the system during the scheduling period T
Summary
The energy crisis, the greenhouse effect and air pollution have become more and more serious. Lu et al established a low-carbon economic dispatch model for an integrated electric and thermal energy system They proposed a model of minimum coordination between the rate of heat storage and the power of the electric boiler under the limit of wind power consumption, and compared the influence of different positions of the electric boiler on the heat loss of the heating network [15]. It can be seen that the increase of thermal auxiliary equipment can effectively decouple the electric and thermal characteristics of the cogeneration unit, and through reasonable unit scheduling, the grid-connection consumption of new energy such as wind power can be achieved and operation costs can be reduced.
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