Day-ahead Economic Dispatch Model of Park Integrated Energy System Considering Reserve Allocation of Energy Storage

doi:10.12204/j.issn.1000-7229.2022.12.011

Abstract

Abstract:

Reserve can effectively deal with the risk brought by uncertainties and ensure the safe operation of park integrated energy system (PIES). However, previous studies mainly focused on the reserve capacity of generators to deal with the risk brought by uncertainties, and did not consider the reserve role of other flexible resources such as energy storage devices. An economic scheduling model of PIES is proposed in this paper, which considers the participation of energy storage devices in reserve allocation. The reserve capacity provided by electric energy storage, diesel generator and combined heat and power (CHP) is utilize to stabilize the volatility of wind and photovoltaic power. In order to balance the influence of reserve allocation on the operation safety and economy of PIES, a reserve allocation model considering renewable energy and load uncertainties is constructed on the basis of chance constrained programming (CCP). The reserve allocation model is embedded into the day-ahead optimal scheduling model to improve the rationality of day-ahead energy and reserve decision-making plan. By using discrete step transformation and stochastic simulation method, the original non-convex CCP problem is transformed into a solvable mixed integer linear programming (MILP) problem. The simulation results show that the participation of energy storage devices in reserve allocation can improve the operation flexibility of generators, thus improving the economy of system operation. By adjusting the confidence level of the upward and downward reserve constraint, the conservative degree of the park reserve decision can be changed, thus balancing the economy and reliability requirements of the system operation.

Key words: chance-constrained programming, park integrated energy system, discretized step transformation, reserve allocation, energy storage

CLC Number:

TM73

YANG Ruilin, LI Keran, LIU Junyong, LIU Jichun, XIANG Yue. Day-ahead Economic Dispatch Model of Park Integrated Energy System Considering Reserve Allocation of Energy Storage[J]. ELECTRIC POWER CONSTRUCTION, 2022, 43(12): 103-111.

Figures/Tables 16

Table 1 Probability sequence of wind power output

Fig.1 Topology of a PIES

Table A1 Parameters of CHP and diesel generator

Table A2 Parameters of energy storage devices

Table A3 Parameters of EB and GF

Table A4 Other parameters

Table A5 Price parameters

Fig.2 Price curve of energy purchase and sale

Table 2 Parameters of WT and PV

Table 3 Comparison results of operation cost and reserve

Fig.3 Optimal decision result of adjustable reserve of ESS

Fig.4 Electric power balance

Table 4 Total power generation of different cases kW·h

Fig.5 Heat balance

Fig.6 Operating cost with different confidence level

Table 5 Operating cost under different discrete step

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