电工技术学报  2023, Vol. 38 Issue (7): 1852-1863    DOI: 10.19595/j.cnki.1000-6753.tces.220743
电力系统与综合能源 |
分散架构下多虚拟电厂分布式协同优化调度
李翔宇, 赵冬梅
华北电力大学电气与电子工程学院 北京 102206
Distributed Coordinated Optimal Scheduling of Multiple Virtual Power Plants Based on Decentralized Control Structure
Li Xiangyu, Zhao Dongmei
School of Electrical and Electronic Engineering North China Electric Power University Beijing 102206 China
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摘要 双碳战略与电力市场改革背景下,未来配电网中将形成多虚拟电厂共存的格局。为实现利益主体各异的多虚拟电厂协调优化调度,该文基于“信息分离、决策协同”思想,提出一种基于拉格朗日对偶松弛的多虚拟电厂分布式协调优化调度方法。首先,构建多虚拟电厂分布式协调优化控制机制;接着,构建多虚拟电厂多时段协调优化调度模型,基于供需关系构建虚拟电厂间交易电价函数;然后,利用拉格朗日对偶松弛理论对优化模型进行松弛,将原问题转为多虚拟电厂分布式优化问题,并采用分布式部分可观测的马尔科夫决策过程将日前多时段协调优化调度问题重构为实时优化调度问题,基于改进量子遗传算法对优化问题进行求解;最后,通过仿真计算验证了所提方法的有效性。
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李翔宇
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关键词 多虚拟电厂拉格朗日对偶松弛分布式优化实时优化调度    
Abstract:For multiple virtual power plants (MVPP) in regional distribution network, the coordinated optimization based on the mutual power support between virtual power plants (VPPs) will impove the the flexibility and economical efficiency of scheduling. However, most of the research on MVPP coordinated optimal scheduling adopts the idea of centralized modeling and unified solution. With the increase of the number of aggregated resources, this method becomes more difficult to solve, and is not conducive to the privacy protection of each VPP. To solve these issues, this paper proposes a distributed coordinated optimal scheduling method or MVPP under decentralized control structure based on the idea of "information separation and decision coordination".
Firstly, a distributed coordination and optimal control mechanism for MVPP is constructed. Secondly, the multi-time coordinated optimal scheduling model of MVPP is constructed, and the transaction price function between VPPs is constructed based on the relationship between supply and demand of power. Then, the Lagrange dual relaxation theory is used to relax the optimization model. Finally, the day-ahead multi-time coordinated optimal scheduling problem is transformed into a real-time optimal scheduling problem based on decentralized partially-observable Markov decision process (DEC-POMDP), and the optimization problem is solved based on the improved quantum genetic algorithm (QGA).
Simulation results on the MVPP system composed of three VPPs show that, when MVPP adopts coordinated optimal scheduling, the total amount of electricity sold to the grid is 8 517.60 kW·h, the total amount of electricity purchased from the grid is 125.41 kW·h, and the total cost is 998.68 ¥. When each VPP adopts optimal scheduling independently, the total amount of electricity sold to the grid is 9 921.44 kW·h, the total amount of electricity purchased from the grid is 823.26 kW·h, and the total cost is 1 392.75 ¥. This is because when MVPP adopts coordinated optimal scheduling, the transaction price between VPPs is better than electricity market. Under the incentive of the electricity price, transactions between VPPs are prioritized, and the transaction volume with the grid is reduced accordingly, and the total cost is also reduced. Then, the MVPP coordinated optimal scheduling model is solved by the centralized and distributed optimization methods respectively, the calculation results of these two methods are basically consistent, and the calculation time is 42.67 s and 12.84 s respectively. Based on the proposed distributed optimization method, each VPP only needs to interact with Lagrangian multipliers, and each sub-problem can be calculated in parallel to improve the solution efficiency, which takes into account the information privacy and computing efficiency. Finally, comparing the day-ahead optimal scheduling and the real-time optimal scheduling based on DEC-POMDP, when the day-ahead optimal scheduling plan is executed, the power shortage or surplus caused by prediction error are made up or absorbed by the power grid. While the real-time optimal scheduling based on DEC-POMDP performs optimal calculation based on the measured values of wind power and load, VPP can cope with the fluctuation of wind power and load through internal resources coordination or mutual power support between VPPs, which will reduce the electricity transactions with the grid.
The following conclusions can be drawn from the simulation analysis: (1) MVPP reduces the electricity transactions with electricity market based on coordinated optimal scheduling through the mutual power support among internal VPPs, and constructs the inter-VPP transaction price function to improve the enthusiasm of VPP to participate in direct trading, which has higher economical efficiency compared with the independent optimal scheduling of each VPP. (2) The distributed coordinated optimal scheduling model of MVPP based on the principle of Lagrange dual relaxation, can realize the global optimization only by exchanging a small amount of information between VPPs, and guarantee the information privacy of VPP better than the centralized optimization. (3) The MVPP multi-time coordinated optimal scheduling problem is transformed into a real-time optimal scheduling problem based on DEC-POMDP, which can effectively deal with the scheduling deviation caused by the prediction error and ensure the reasonable allocation of the resource output plan within one day.
Key wordsMultiple virtual power plants    Lagrangian dual relaxation    distributed optimization    real-time optimal scheduling   
收稿日期: 2022-05-05     
PACS: TM62  
  TM73  
基金资助:国家重点研发计划资助项目(2017YFB0902600)
通讯作者: 李翔宇 男,1988年生,博士研究生,研究方向为新能源并网运行及其控制。E-mail:41089024@qq.com   
作者简介: 赵冬梅 女,1968年生,教授,博士生导师,研究方向为电力系统分析析、稳定和控制、电力市场及新能源并网运行。E-mail:zhao-dm@ncepu.edu.cn
引用本文:   
李翔宇, 赵冬梅. 分散架构下多虚拟电厂分布式协同优化调度[J]. 电工技术学报, 2023, 38(7): 1852-1863. Li Xiangyu, Zhao Dongmei. Distributed Coordinated Optimal Scheduling of Multiple Virtual Power Plants Based on Decentralized Control Structure. Transactions of China Electrotechnical Society, 2023, 38(7): 1852-1863.
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