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

Bo Liu,Guoqing Li,Haotian Ma,Chenghong Gu,Manling Gao,Jiang Li,Shuo Zhang

doi:10.1109/access.2020.2968583

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.

Highlights

Wind power, as a renewable energy source with high commercial value, has experienced fast growth over the last decades
Electric boilers are more effective in reducing wind curtailment, whereas heat storage tanks can further improve the flexibility for heat and power energy conversion
The main contributions of this work include the following two aspects: i)the cost of wind curtailment is built as the penalty factor of economic dispatching for combined heat and power energy system; ii) a single-order linear dynamic system for evaluating the thermal behavior of CHPs is converted into algebraic equations considering thermal slow-response profiles for building thermal inertia and heat network inertia

Summary

INTRODUCTION

As a renewable energy source with high commercial value, has experienced fast growth over the last decades. Reference [11] establishes a CHP dispatch model for better integration of wind power based on electric boilers and thermal storage equipment. Electric boilers are more effective in reducing wind curtailment, whereas heat storage tanks can further improve the flexibility for heat and power energy conversion. An economic dispatch optimization model of VOLUME 8, 2020 a CHP unit with a heat storage tank and electric boilers is constructed. The main contributions of this work include the following two aspects: i)the cost of wind curtailment is built as the penalty factor of economic dispatching for combined heat and power energy system; ii) a single-order linear dynamic system for evaluating the thermal behavior of CHPs is converted into algebraic equations considering thermal slow-response profiles for building thermal inertia and heat network inertia

COMBINED HEAT AND POWER ENERGY SYSTEM

MODEL SOLUTION PROCEDURE

HEAT AND POWER ANALYSIS IN DIFFERENT SCENARIOS

CONCLUSION