Economic Dispatch of Combined Heat and Power Energy Systems Using Electric Boiler to Accommodate Wind Power

Abstract

It is of significant economic value to use an electric boiler to coordinate the heating network and power grid to reduce wind curtailment during heating supply seasons in the north area. This paper presents an optimal economic dispatching model of combined heat and power energy systems to minimize the total operation cost and wind curtailment by using electric boilers. The proposed model comprehensively considers the thermal characteristics of buildings and the constraints of electric and thermal power balancing, combined heat and power (CHP) units, heat storage tanks, electric boiler power, and wind power. To address this model, a linearization optimization model is built, where different dispatch strategies under CHP only, CHP + HST (heat storage tanks), and CHP + HST + EB (electric boiler) different conditions are conducted. Thereafter, the relationship between indoor temperature and thermal power is analyzed with consideration of the temperature time-delay effect and the heat loss on heating balance. A 6-node combined heat and power energy system is used to validate the effectiveness of the proposed model and solution method. Furthermore, the case studies illustrate the impact of heat storage tanks and the electric boiler on wind power curtailment and coal consumption. INDEX TERMS Power generation dispatch, energy storage, wind power generation, thermal analysis.

Wind Power Accommodation Method for Regional Integrated Heat-Power System Considering Generation and Load Uncertainties

“…FANG et al [13] proposed to use electric boiler (EB) with heat storage to participate in peak load regulation of power grid, so that the power grid can accommodate more wind power generation. LIANG et al [14] and LIU et al [15] respectively analyzed the improvement effect of CHP unit and electric boiler equipped with heat storage device on the wind power accommodation capacity of integrated heat-power system. Through calculation, it showed that heat storage device and electric boiler can improve the wind power accommodation capacity and reduce coal consumption.…”

Automatic control system of boiler thermal energy in thermal power plant based on artificial intelligence technology

“…To test the performance of the ADRC system in tracking the main steam temperature command signal, the paper added a unit step signal to the main steam temperature command signal input terminal to investigate the rapidity, accuracy and robustness of the system in tracking the given value [8].…”

“…Since the main regulator adopts an active disturbance rejection controller, there is currently no effective method for determining the parameter setting of the state error feedback controller [9]. Therefore, combined with the simulation experiment, the paper gives the coefficients of the non-linear state error feedback controller: q 1 = 450, q 2 = 27000, q 3 = 1.65 × 10 6 , q 4 = 2.35 × 10 7 , q 5 = 2.35 ×10 8 . The secondary regulator P adopts a pure proportional regulator, and the proportional coefficient is kp 2 = 8.…”

Generalized Benders Decomposition Based Dynamic Optimal Power Flow Considering Discrete and Continuous Decision Variables

“…where Ui,min and Uimax are the maximum and minimum of node i voltage; Pij,max and Pijmin are the maximum and minimum of power on branch ij; PGi,max and PGi,min are the maximum and minimum of generator active power output; QGi,max and QGi,min are the maximum and minimum of generator reactive power; PGi,up and PGi,down are the upper and lower ramp limits of generator output. Equations (5) represent nodal voltage constraint, line power constraint, generator active and reactive power output constraints, and generator active power output ramp constraints, respectively.…”

“…Dynamic optimal power flow (DOPF) is one of the key problems in power system economic dispatch and safe operation [1]. The DOPF problem is a typical mixed integer nonlinear programming problem essentially [2][3][4][5][6].…”