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Reactive Power Optimization Operation of Virtual Power Plant Considering Reactive Power Potential of New Energy Sources
Zefei TAO, Min LIU, Wenxia LIU
Distributed Energy ›› 2025, Vol. 10 ›› Issue (3) : 31-41.
PDF(7250 KB)
PDF(7250 KB)
Reactive Power Optimization Operation of Virtual Power Plant Considering Reactive Power Potential of New Energy Sources
With the in-depth promotion of the strategy of "carbon peak and carbon neutrality",virtual power plant (VPP) has shown significant advantages in integrating and dispatching new energy. It is one of the effective means to improve the operation economy of VPP to deeply tap the huge potential of new energy in the field of reactive power support. Firstly,a set of new energy reactive power capacity evaluation system considering active power output and inverter constraints was constructed. Secondly,in order to improve the solving speed of the reactive power optimization model,according to the nonlinear characteristics of active network loss and power flow constraints,an active network loss estimation method based on power flow iteration and a power flow linearization method based on variable space optimization selection were proposed. A VPP linear power flow reactive power optimization model considering the reactive power potential of new energy sources and based on variable space optimization selection was constructed. Finally,the improved IEEE 33-node active distribution system was taken as an example to verify the effectiveness of the proposed model. The results show that when VPP makes full use of the reactive power support ability of new energy,the system voltage deviation is reduced by 0.673 pu,and the operating cost is reduced by 1 254.9 yuan.
new energy / virtual power plant / reactive power optimization / linear power flow / power loss estimation
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目的 为应对虚拟电厂(virtual power plant,VPP)在参与电能量和需求响应市场时所面临的新能源出力和负荷不确定性问题,提出一种考虑多重不确定性的鲁棒优化调度策略,旨在降低鲁棒优化的保守性并提高VPP的经济效益。 方法 构建基于条件风险价值(conditional value at risk,CVaR)的多面体不确定性集,在此基础上,考虑风电、光伏出力和负荷的不确定性,建立VPP参与电能量和需求响应市场策略的日前两阶段鲁棒优化模型。基于行列生成(column-and-constraint generation,C&CG)算法和拉格朗日对偶理论,将所建模型分为可利用求解器求解的主问题和子问题。最后,利用蒙特卡罗方法生成大量风电、光伏和负荷数据,对所提策略进行仿真分析,并与其他方案的优化结果进行对比。 结果 所提策略采用基于CVaR的多面体不确定性集,能够充分利用历史数据,相比于采用传统不确定性集的方案,VPP的总成本降低了约2%。 结论 所提策略可以显著降低鲁棒优化结果的保守性,并在多重不确定性条件下提升VPP参与市场的经济性。
Objectives To address the uncertainties of renewable energy output and load faced by virtual power plant (VPP) when participating in electric energy and demand response markets, a robust optimal scheduling strategy considering multiple uncertainties was proposed to reduce the conservativeness of robust optimization and improve the economic benefits of VPP. Methods A polyhedral uncertainty set based on conditional value at risk (CVaR) was constructed. On this basis, considering the uncertainties of wind power, photovoltaic output and load, a day-ahead two-stage robust optimization model of VPP participating in electric energy and demand response markets was established. Then, using a column-and-constraint generation (C&CG) algorithm and Lagrangian dual theory, the model was divided into a master problem and a sub-problem that can be solved by a solver. Finally, Monte Carlo method was used to generate a large number of wind power, photovoltaic and load data. The proposed strategy was simulated and analyzed, and compared with the optimization results of other schemes. Results The proposed strategy adopting a polyhedral uncertainty set based on CVaR can make full use of historical data. Compared with the scheme using traditional uncertainty set, the total cost of VPP is reduced by about 2%. Conclusions The proposed strategy can significantly reduce the conservativeness of robust optimization results and enhance the economy of VPP participation in the market under multiple uncertainties. |
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To address the impact of decision makers risk attitudes (DMRAs) and uncertainties on dispatch strategies in community-integrated energy systems, a multi-objective dispatch model of a community virtual power plant (CVPP) is proposed. First, a novel CVPP model that considers DMRA and a multi-objective economics-energy-environment satisfaction model was developed. The information gap decision theory (IGDT) model is then improved considering uncertainties of renewable energy, loads, and DMRA. Third, considering DMRA, an improved VIKOR method was proposed under self-confident double-hierarchy linguistic preference relations. Finally, the effectiveness of the proposed model was validated regarding a multi-scenario example of a residential area. The results indicate the following: 1) The novel CVPP provides realistic scheduling strategies based on the DMRA. 2) After implementing demand response, the resident cost and net carbon emissions are reduced by 9% and 91%, respectively. In addition, the energy supplier profit and renewable energy utilization rate are increased. The constructed IGDT model also improves multiple objectives. 3) The improved uncertainty and deviation factors of the IGDT model allow diverse scheduling strategies. Simultaneously, the improved VIKOR method provides a new way for decision makers to select strategies. This model serves as a guide for selecting scheduling strategies and encourages the use of renewable energy sources.
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