Distributed Economic Dispatch for Islanded DC Microgrids Based on Finite-Time Consensus Protocol

Zaery, Mohamed; Wang, Panbao; Huang, Rui; Wang, Wei; Xu, Dianguo

doi:10.1109/access.2020.3032641

Cited by 17 publications

(11 citation statements)

References 41 publications

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“…8(c) shows the power mismatch is zero, which means the system power supply-demand balance is satisfied. This is also consistent with the analysis in (21). The optimal power output is P * =[21.67kW, 33.67kW, 22.57kW, 2.22kW, -45.93kW, - 34.19kW] with  * =4.943, and the social welfare is 194.01$/h.…”

Section: A Without Power Generation Constraintssupporting

confidence: 88%

“…Therefore, the power supplydemand is balanced before the iteration begins. Equation (21) shows that the sum of power variations is zero, which means that the proposed method maintains system power balance during iterations. And the optimal solution for the economic dispatch can be obtained if all i(t) converges to  * as t→.…”

Section: B Economic Dispatch Methods Without Power Generation Constra...mentioning

confidence: 99%

“…The authors of [20] develop a fixed-time consensusbased distributed algorithm to achieve optimal dispatch within a fixed set time. In [21], a fully distributed control strategy based on the finite-time consensus protocol is developed in DC microgrids. In [22], the authors propose a fully distributed method by using the exact diffusion strategy under sparse communication network.…”

Section: Introductionmentioning

confidence: 99%

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A Fully Distributed Economic Dispatch Method in DC Microgrid Based on Consensus Algorithm

Liú

Jiang²,

Yan

et al. 2022

IEEE Access

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Uncertainties of intermittent renewables and complexities of load demands bring challenges to the optimal operation of the microgrid. This paper proposes a fully distributed method based on consensus algorithm for solving the economic dispatch problem (EDP) of DC microgrid. The proposed distributed method is performed using multiagent system. It only needs information from neighboring agents and does not need a central controller. A two-level control structure is adopted to realize the economic dispatch and voltage regulation simultaneously. The upper level obtains the optimal power reference of dispatchable agents and maintains the power balance of the system. The lower level performs an improved droop control to track the power reference and regulate the average bus voltage for the microgrid. The proposed method's properties and convergence are analyzed using eigenvalue perturbation theory to obtain a faster convergence speed. By designing the adjacency matrix appropriately, the proposed method can ensure the system stable when the communication topology changes. Finally, several simulations are designed to verify the effectiveness of this novel control method.INDEX TERMS DC Microgrid, economic dispatch, consensus algorithm, renewable generation.

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Section: A Without Power Generation Constraintssupporting

confidence: 88%

Section: B Economic Dispatch Methods Without Power Generation Constra...mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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A Fully Distributed Economic Dispatch Method in DC Microgrid Based on Consensus Algorithm

Liú

Jiang²,

Yan

et al. 2022

IEEE Access

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“…Thus, they not only have the defect of disclosing bus privacy but require a high-performance computer and a reliable control-center-oriented communication network. The recently proposed distributed economic dispatch (DED) methods [6], [7], [8], [9] not only have the potential ability to preserve the bus privacy due to their distributed calculation but can lower the requirements for the computer performance and communication by distributing the computational burden among distributed computers and exchanging information between neighbors. These features are required not only by the sufficiency of electricity market competition but by the dispersity of renewable power sources.…”

Section: Introductionmentioning

confidence: 99%

Bus-Privacy-Preserving Distributed Economic Dispatch Method for Power Systems Using Iteration Functions

Peng

Tan

et al. 2022

IEEE Access

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The sufficiency of electricity market competition and the economy of power system operation require that the economic dispatch should not only preserve the bus privacy but consider network losses. The existing economic dispatch methods, however, can't preserve the privacy of each bus from leakage and even complicate the solution when they reasonably consider network losses, due to the coupling complexity of network losses. To address these issues, this paper presents a novel distributed economic dispatch (DED) method based on KKT optimality conditions and iteration functions. It focuses on an economic dispatch model that contains bus active power balance equations and generator power limit inequalities. First, the model's KKT optimality conditions with inequalities are simplified to equivalent pure equality-type optimality conditions. Then a set of iteration functions is created using the Taylor series, which overcomes the difficulty caused by the fact that unknown bus voltage phases are completely contained in the sine and cosine functions of optimality conditions. Finally, a fast fixed-point iteration procedure is proposed for bus agents to solve the economic dispatch model. The proposed method reasonably considers network losses by using the set of bus active power balance equations. It not only preserves the privacy of each bus from leakage but is straightforward in solution (does not complicate the solution). In addition, it is fully bus-level distributed. Numerical simulation results of systems with different sizes verified the effectiveness and advantages of the proposed method.

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“…To make the algorithm perform well even when the cost function is a general convex function, a method based on secant approximation is proposed to achieve efficient convergence (Zhong et al, 2021). (Chen et al, 2017;Zaery et al, 2020) use finite-time consensus for solving the EDP so that the algorithm converges in a determined finite time. In addition, issues such as network loss compensation (Sun et al, 2021) and information security encryption (Yan et al, 2021) have been considered.…”

Section: Introductionmentioning

confidence: 99%

Distributed Economic Dispatch Based on Finite-Time Double-Consensus Algorithm of Integrated Energy System

Yang

Du²

2022

Front. Energy Res.

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To reduce the operating cost and enhance the energy utilization efficiency of the integrated energy system (IES), an economic dispatch algorithm is proposed based on finite-time double-consensus. First, an economic dispatch model of IES under two modes of operation, islanded and grid-connected, is constructed considering energy transmission losses. After that, the optimal improved incremental cost and power output allocation of the IES can be found out in finite time. The proposed algorithm contains two finite-time consistency protocols simultaneously that can solve the optimal values of the incremental cost of electricity and heat of integrated energy system, solving the strong coupling problem of multi-energy systems. The proposed algorithm not only has a faster convergence rate but also enables switching freely between the two operation modes. In addition, a distributed method for quickly discovering the total system power mismatch is proposed in the process of algorithm solving. The finite-time convergence of the proposed algorithm is demonstrated. Finally, the IES simulation based on the IEEE 30-node power system and the Bali 32-node thermal system is established. The analysis of the simulation results shows that the algorithm proposed in this paper is effective.

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Distributed Economic Dispatch for Islanded DC Microgrids Based on Finite-Time Consensus Protocol

Cited by 17 publications

References 41 publications

A Fully Distributed Economic Dispatch Method in DC Microgrid Based on Consensus Algorithm

A Fully Distributed Economic Dispatch Method in DC Microgrid Based on Consensus Algorithm

Bus-Privacy-Preserving Distributed Economic Dispatch Method for Power Systems Using Iteration Functions

Distributed Economic Dispatch Based on Finite-Time Double-Consensus Algorithm of Integrated Energy System

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