Robust Optimal Scheduling Model of Virtual Power Plant Combined Heat and Power Considering Multiple Flexible Loads

doi:10.12204/j.issn.1000-7229.2021.07.001

Abstract

Abstract:

Aiming at the lack of coordination and optimization of multiple flexible loads under combined heat and power operation and the uncertainties faced by wind, solar power, and flexible loads, a robust optimization scheduling method for virtual power plant(VPP)combined heat and power considering flexible loads is proposed. Fully considering the coordination and complementarity among the reduction, translation and transferable flexible loads, the standard deviations of the thermal and electric load curves and the lowest comprehensive operating cost of the system are chosen to be the goals, and a dual-layer coordinated optimization operation model of virtual power plant combined heat and power is established, which may improve the coordination and optimization effect of multiple flexible loads. The prediction error uncertainty of wind and solar power and flexible load is dealt with by the robust optimization method to improve the system operation robustness. The coordination and optimization of multiple flexible loads enhance the system's flexible adjustment capabilities and make the economy better. The comparison of the optimization effects of flexible loads under different robustness coefficients provides a reference for decision makers in different demand scenarios. The analysis of an example verifies the effectiveness of the proposed model.

Key words: virtual power plant (VPP), uncertainty, robust optimization, flexible load, combined heat and power operation

CLC Number:

TM73

WANG Zhinan, ZHANG Yuhua, HUANG Ke, WANG Cong. Robust Optimal Scheduling Model of Virtual Power Plant Combined Heat and Power Considering Multiple Flexible Loads[J]. ELECTRIC POWER CONSTRUCTION, 2021, 42(7): 1-10.

Figures/Tables 14

Fig.1 System operation structure

Fig.2 System optimization process

Fig.3 System solution flow

Table 1 Parameters of controllable units

Table 2 Parameters of shiftable loads

Table 3 Parameters of transferable loads

Table 4 Parameters of reducible loads

Table 5 Setting of scenes

Fig.4 Comparison of optimization effect in different scenarios

Table 6 Comparison of performance indices of optimization under different scenarios

Fig.5 Comparison of effect before and after optimization of flexible load

Fig.6 Optimal configuration effect of flexible load under different robustness coefficients

Table 7 Comparison of optimization effect under different robustness coefficients

Fig.7 VPP combined heat and power operation power optimization diagram

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