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Coordinated optimal dispatch of VPPs in unbalanced ADNs

IET GENERATION TRANSMISSION & DISTRIBUTION 2020年第8期14卷 1430-1437页

作者： Xu, Tong Wu, Wenchuan Wang, Zhen-Yi Zhu, Tao Tsinghua Univ Tsinghua Berkeley Shenzhen Inst Shenzhen Environm Sci & New Energy Technol Engn L Shenzhen Peoples R China Tsinghua Univ Dept Elect Engn State Key Lab Power Syst Beijing Peoples R China Yunnan Power Grid Co Ltd Power Dispatch & Control Ctr Kunming Yunnan Peoples R China Kunming Elect Power Supply Bur Power Dispatch & Control Ctr Kunming Yunnan Peoples R China

To manage and control massive distributed energy resources (DERs) integrated into active distribution networks (ADNs), dispersed DERs are aggregated as virtual power plants (VPPs). This study introduces a distributed optimal dispatch strategy of VPPs considering operational constraints in unbalanced ADN. First, a practical multi-VPP coordination optimal dispatch model considering P-Q coupling characteristics in unbalanced ADN is proposed. Then, the primal-dual interior-point algorithm is employed to transform the original model into a Karush-Kuhn-Tucker equation, where afterwards distributed quasi-Newton method is developed to solve the equation. Under the proposed distributed strategy, each VPP only communicates limited boundary information with utility grid. With the advantage of quasi-second-order information, the proposed method outperforms the popular distributed gradient-based algorithm, alternating direction method of multipliers. The distributed method provides merits such as efficient calculation and privacy protection for multi-VPP operation in ADN. Numerical tests evaluate the efficiency and accuracy of the proposed method.

关键词： Newton method energy resources distributed power generation power grids distribution networks power generation dispatch nonlinear programming power system management power plants primal-dual interior-point algorithm distributed quasiNewton method quasisecond-order information distributed method VPP unbalanced ADN massive distributed energy resources active distribution networks virtual power plants distributed optimal dispatch strategy multiVPP coordination optimal dispatch model dispersed DER Karush-Kuhn-Tucker equation DER management DER control operational constraints P-Q coupling characteristics privacy protection

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Fully distributed AC power flow (ACPF) algorithm for distribution systems

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IET SMART GRID 2019年第2期2卷 155-162页

作者： Pourbabak, Hajir Ajao, Adetokunbo Chen, Tao Su, Wencong Univ Michigan Coll Engn & Comp Sci Dept Elect & Comp Engn Dearborn MI 48128 USA

Power flow is one of the basic tools for system operation and control. Due to its nature, which determines the complex nodal voltages, line flows, currents and losses, it enforces a large computation load on a power system. A distributed/decentralised algorithm unburdens the central controller and shares the total computation load with all agents. Therefore, such algorithms are an effective method for dealing with power flow complexity. In this study, a distributed method based on a linearised AC power system is proposed. First, the linearisation procedure of a comprehensive non-linear AC power flow (ACPF) is detailed. Second, a distributed method is presented based upon the linear ACPF equations. Three case studies are presented to evaluate the overall performance of the proposed method. In the first case study, the accuracy level of both linearised ACPF and distributed ACPF is assessed. In the second case study, the dynamic performance of distributed ACPF is investigated based on the load sudden changes. In the third case study, the scalability of the proposed distributed ACPF is evaluated by applying it to a larger power system.

关键词： load flow power system security power system management AC power flow algorithm distribution systems system operation control complex nodal voltages distributed decentralised algorithm central controller shares total computation load effective method power flow complexity distributed method linearised AC power system nonlinear AC power flow linear ACPF equations case study linearised ACPF distributed ACPF larger power system

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Penalty methods for distributed Optimization with Inequality and Equality Constraints 40

Penalty Methods for Distributed Optimization with Inequality...

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40th Chinese Control Conference (CCC)

作者： Xia, Zicong Liu, Yang Zhejiang Normal Univ Coll Math & Comp Sci Jinhua 321004 Zhejiang Peoples R China

ISBN: (纸本)9789881563804

This paper focuses on the penalty method, which has the potential to turn constrained problems into unconstrained ones, for distributed optimization with inequality and equality constraints. A selection principle to choose penalty gains is proposed based on value-distance ratio. Furthermore, a distributed method is developed to solve the obtained problems while its convergence is rigorously proved. Finally, an example in a numerical way demonstrates the validity of this paper.

关键词： distributed optimization Penalty methods distributed method Non-smooth analysis

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distributed Interference Alignment in Partially Connected Networks Without Preliminary Topological Knowledge 4

Distributed Interference Alignment in Partially Connected Ne...

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4th IEEE International Conference on Future Internet of Things and Cloud (FiCloud)

作者： Farkas, Peter Staron, Matej Schindler, Frank Slovak Univ Technol Bratislava Inst Telecommun Ilkovicova 3 Bratislava 81219 Slovakia Pan European Univ Inst Appl Informat Tematinska 10 Bratislava 85105 Slovakia

In this paper a new very simple distributed method for interference alignment is proposed. It is applicable to partially connected interference networks. In contrast to the known topological interference alignment tec... 详细信息

ISBN: (纸本)9781509039463

关键词： interference alignment distributed method partially connected networks topology ad hoc networks wireless networks IoT protocol

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Accelerated Multi-Agent Optimization method over Stochastic Networks 59

Accelerated Multi-Agent Optimization Method over Stochastic ...

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59th IEEE Conference on Decision and Control (CDC)

作者： Ananduta, Wicak Ocampo-Martinez, Carlos Nedic, Angelia Delft Univ Technol Delft Ctr Syst & Control DCSC Delft Netherlands Inst Robot & Informat Ind CSIC UPC Barcelona Spain Arizona State Univ Sch Elect Comp & Energy Engn Tempe AZ 85287 USA

ISBN: (纸本)9781728174471

We propose a distributed method to solve a multi-agent optimization problem with strongly convex cost function and equality coupling constraints. The method is based on Nesterov's accelerated gradient approach and works over stochastically time-varying communication networks. We consider the standard assumptions of Nesterov's method and show that the sequence of the expected dual values converge toward the optimal value with the rate of O(1/k(2)). Furthermore, we provide a simulation study of solving an optimal power flow problem with a well-known benchmark case.

关键词： multi-agent optimization distributed method accelerated gradient method distributed optimal power flow problem

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distributed Energy Management for Supply-Demand Coordination in a Smart Grid

Distributed Energy Management for Supply-Demand Coordination...

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IEEE/PES Transmission and Distribution Conference and Exposition (T&D)

作者： Zhang, Yihe Gao, Ling Xu, Yinliang Sun Yat Sen Univ SYSU CMU Joint Inst Engn SYSU CMU Shunde Int Joint Res Inst Guangzhou 510006 Guangdong Peoples R China

ISBN: (纸本)9781509021574

New low-carbon appliances (renewable generator, electric vehicle, etc.) develop rapidly and require advance control strategies to address their new features such as dispersed location and intermittency. Traditional centralized methods may not be an effective and economical solution, since a sophisticated communication network is needed to collect global information and a powerful central controller is required to process huge amount of data. This paper proposes a distributed method to optimize the overall social benefit and maintain the supply demand balance in a smart grid, considering three different types of load models including electric vehicle, air conditioning, lighting and electronic devices. Only information exchange among neighboring nodes is utilized, which enables the sharing of the computation and communication burden among local controllers to simplify the communication network and avoid the investment of expensive and powerful central controller. The effectiveness of the proposed distributed method is demonstrated through the simulation in the IEEE 14-bus system.

关键词： smart grid load model distributed method supply demand balance

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Power Restoration method of Distribution Network with ESS and DG

Power Restoration Method of Distribution Network with ESS an...

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IEEE IAS Conference on Industrial and Commercial Power System Asia (IEEE I and CPS Asia)

作者： Sun, Shoujing Cong, Wei Qiu, Jifu Chen, Ming Wei, Zhen Zhang, Zijin Shandong Univ Key Lab Power Syst Intelligent Dispatch & Control Jinan Peoples R China Shandong Elect Power Co State Grid Qingdao Power Supply Co Qingdao Peoples R China

ISBN: (纸本)9781665434980

A restoration method of distributed power supply in power grid with energy storage system is proposed. First, it introduces the principle of distributed access and operation constraints of ESS and DG in the distribution network. Utilizing the parallel coordination and information interaction between independent and peer intelligent terminals in the distribution network, the power restoration method is adopted, which mainly includes two parts: distributed network topology search and expression and calculation of constraints on power restoration. It not only exerts the advantages of ESS in power restoration, but also avoids the problems of large amount of information collection and large amount of calculation in the centralized power restoration method in the distribution network. At the same time, consider the ESS power control adjustment strategy to achieve reasonable power support for the distribution network to expand the scope of power restoration in the power outage area. The simulation results of the IEEE33-bus system example verify the flexibility and effectiveness of the proposed method.

关键词： distribution network power restoration energy storage system (ESS) distributed generator (DG) distributed method

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Adaptive Diffusion for distributed Optimization over Multi-Agent Network with Random Delays 22

Adaptive Diffusion for Distributed Optimization over Multi-A...

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22nd International Conference on Information Fusion (FUSION)

作者： Qiu, Yi Zhou, Jie Sichuan Univ Coll Math Chengdu 610064 Sichuan Peoples R China

ISBN: (纸本)9780996452786

Optimizing an aggregate function over a multi-agent network based on diffusion strategies calls for node collaborations, where each sensor exchanges information with their predefined neighbors within its transmission/reception range, and then combines them linearly with fixed and non-adaptive scalar weights to obtain a consensus solution. However, the transmission/reception process may be corrupted by random delays due to imperfect network environment. This paper proposes a distributed method to obtain the adaptive weights considering the occurrence of random one-step delays, which are depicted by Bernoulli random variables with known probability distributions. Then, an adaptive diffusion algorithm for optimizing the aggregate function is presented. Finally, numerical simulations are provided for validating the proposed method.

关键词： Multi-agent network diffusion strategies consensus distributed method adaptive weights

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Agent-Based Approach to distributed Information and Control System Reconfiguration

Agent-Based Approach to Distributed Information and Control ...

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Conference on Computational methods in Systems and Software (CoMeSySo)

作者： Melnik, Eduard Klimenko, Anna RAS SSC Informat Technol & Control Proc Dept Rostov Na Donu Russia Southern Fed Univ Sci Res Inst Multiprocessor Comp Syst Taganrog Russia

ISBN: (纸本)9783319676180

A problem of distributed information and control system (DICS) dependability is relevant nowadays. The DICSs with the performance redundancy and decentralized dispatching implemented by multiagent system are in the scope of this paper. The peculiarities of this class of DICSs require special approaches to the monitoring, control and reconfiguration procedures. The agent-based approach to the DICS reconfiguration is represented. It takes into account a potential of performance redundancy in the aspect of fault-tolerance. The configuration forming problem is solved when it is required by local interactions between software agents via constraint satisfaction problem solving. The paper contains the brief review of the DICS dependability problem and related works, description of performance redundancy and reconfiguration distributed procedure. Two-step agent-based approach to DICS reconfiguration described in details, algorithms of agent interactions and some simulation results are represented and discussed briefly.

关键词： Agent interaction distributed method distributed algorithms Reconfiguration distributed information and control system Control system

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distributed source localization via projection onto the nearest local minimum

Distributed source localization via projection onto the near...

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33rd IEEE International Conference on Acoustics, Speech and Signal Processing

作者： Shi, Qingjiang He, Chen Shanghai Jiao Tong Univ Dept Elect Engn Shanghai 200240 Peoples R China

ISBN: (纸本)9781424414833

When addressing the energy-based source localization problem using wireless sensor networks, distributed localization method is necessary to reduce the energy and bandwidth consumption. In this paper, a novel distributed source localization method called projection onto the nearest local minimum (PONLM) is proposed, which can be carried out at each of active nodes with quite lightweight computation, in contrast to most existing centralized method. Simulation results show our method can yield much better performance than the previous methods.

关键词： energy-based source localization wireless sensor networks distributed method PONLM

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