1.School of Electrical and Electronic Engineering, North China Electric Power University, Beijing, China;2.Department of Electrical Engineering, North China Electric Power University, Baoding, China
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Abstract:
Electric boilers (EBs) provide an alternative method to deal with the accommodation of curtailed wind power. To pursue the minimum coal consumption in the system, a dispatching model integrating combined-heat-and-power (CHP) plants and EBs in different locations is developed, and the penalty of wind power curtailment and cost of EB employment are also incorporated in the model. The transmission loss and transportation lag of heat-supply network as well as the elasticity of heat load are considered in this paper. A kind of constrained programming with stochastic and fuzzy parameters is applied to deal with the uncertainties. A case in East Inner Mongolia in China demonstrates that the EBs are able to absorb curtailed wind power and supply the heat. The results indicate that the utility of EBs in the primary or secondary heat-supply network to accommodate curtailed wind power is mainly related to the efficiency of heat transmission and the elasticity of heat load.
表 2 Table 2
图1 Load and generation curves of various units.Fig.1
图2 Load and generation curves of various units in power system including EBs.Fig.2
图3 Schematic diagram of EBs deployed to accommodate wind power curtailment.Fig.3
图4 Specific diagram of EBs configured in PHSN and SHSN.Fig.4
图5 Simplified structure of power grid.Fig.5
图6 Original data of heat load, power load, and wind power.Fig.6
图7 Comparison of coal consumptions in four schemes.Fig.7
图8 Curtailed wind power curve with different heat loss coefficients.Fig.8
图9 Comparison of outputs of TP plant, CHP plant and wind power in four schemes. (a) Output of TP plant. (b) Output of CHP plant. (c) Output of wind power.Fig.9
图11 Heat outputs of CHP plant, EBs, and heat load in schemes 2 and 3. (a) Heat output of CHP plant in case 1. (b) Heat output of CHP plant in case 2. (c) Heat output of EB in case 1. (d) Heat output of EB in case 2. (e) Heat load in case 1. (f) Heat load in case 2.Fig.11
图12 Power outputs of TP plant, CHP plant, EB, and wind power in schemes 2 and 3. (a) Output of TP plant in case 1. (b) Output of TP plant in case 2. (c) Power output of CHP plant in case 1. (d) Power output of CHP plant in case 2. (e) Output of EB in case 1. (f) Output of EB in case 2. (g) Output of wind power in case 1. (h) Output of wind power in case 2.Fig.12