Distributed Optimal Frequency Control Considering a Nonlinear Network-Preserving Model

Wang, Zhaojian; Liu, Feng; Pang, John Z. F.; Low, Steven H.; Mei, Shengwei

doi:10.1109/pesgm40551.2019.8974065

Cited by 9 publications

(18 citation statements)

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“…where, M i > 0, D i > 0 are constants, and P ij is the line power from bus i to bus j. This model is suitable for both synchronous generators and converters [37]- [39]. ( 27) can be rewritten as…”

Section: Real-time Implementationmentioning

confidence: 99%

Asynchronous Distributed Power Control of Multi-Microgrid Systems Based on the Operator Splitting Approach

Wang,

Mei,

Liu

et al. 2018

Preprint

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Forming (hybrid) AC/DC microgrids (MGs) has become a promising manner for the interconnection of various kinds of distributed generators that are inherently AC or DC electric sources. This paper addresses the distributed asynchronous power control problem of hybrid microgrids, considering imperfect communication due to non-identical sampling rates and communication delays. To this end, we first formulate the optimal power control problem of MGs and devise a synchronous algorithm. Then, we analyze the impact of asynchrony on optimal power control and propose an asynchronous iteration algorithm based on the synchronous version. By introducing a random clock at each iteration, different types of asynchrony are fitted into a unified framework, where the asynchronous algorithm is converted into a fixed-point problem based on the operator splitting method, leading to a convergence proof. We further provide an upper bound estimation of the time delay in the communication. Moreover, the real-time implementation of the proposed algorithm in both AC and DC MGs is introduced. By taking the power system as a solver, the controller is simplified by reducing one order and the power loss can be considered. Finally, a benchmark MG is utilized to verify the effectiveness and advantages of the proposed algorithm.

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Section: Real-time Implementationmentioning

confidence: 99%

Asynchronous Distributed Power Control of Multi-Microgrid Systems Based on the Operator Splitting Approach

Wang,

Mei,

Liu

et al. 2018

Preprint

Self Cite

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show abstract

“…To have effective primary frequency control, DERs should react within 1 to 2 seconds [3]. Much work has been done to find an efficient and fast method to use loads endowed with local control policies to provide frequency regulation ( [2], [4], [5], [6], [7], [8], [9], [10], [11], [9], [12], [13]).…”

Section: Introductionmentioning

confidence: 99%

“…A distributed secondary frequency control for multi-area systems is presented in [5] which restores the nominal frequency while minimizing the regulation costs. [6] estimates virtual load demand for controllable generators based on local frequency but the approach does not consider demand side frequency control. [7] uses gather-and-broadcast and generalized continuous-time feedback control version of the dual decomposition method [8] to dispatch DERs during the frequency deviations.…”

Section: Introductionmentioning

confidence: 99%

Decentralized Frequency Control using Packet-based Energy Coordination

Mavalizadeh

Espinosa

Almassalkhi

2020

2020 IEEE International Conference on Communications, Control, and Computing Technologies for Smart Grids (SmartGridComm)

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This paper presents a novel frequency-responsive control scheme for demand-side resources, such as electric water heaters. A frequency-dependent control law is designed to provide damping from distributed energy resources (DERs) in a fully decentralized fashion. This local control policy represents a frequency-dependent threshold for each DER that ensures that the aggregate response provides damping during frequency deviations. The proposed decentralized policy is based on an adaptation of a packet-based DER coordination scheme where each device send requests for energy access (also called an "energy packet") to an aggregator. The number of previously accepted active packets can then be used a-priori to form an online estimate of the aggregate damping capability of the DER fleet in a dynamic power system. A simple two-area power system is used to illustrate and validate performance of the decentralized control policy and the accuracy of the online damping estimating for a fleet of 400,000 DERs.

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“…To deal with these problems, control strategies are proposed that eliminate the traditional hierarchical structure and incorporate the control tasks on different time scales by implementing a single control process. For example, some literatures consider ensuring a reasonable allocation of active power while regulating system frequency at the same time [17]- [21]. The idea of breaking the hierarchy of a micro-grid control is proposed in [18], [19], merging the frequency stability condition into the economic optimization problem.…”

Section: Introductionmentioning

confidence: 99%

“…The original-dual gradient algorithm is proposed to achieve optimal frequency control. [21] addresses the distributed optimal frequency control and proves that the equilibrium of system power sharing and frequency attains the optimal solution to the associated economic dispatch problem (EDP).…”

Section: Introductionmentioning

confidence: 99%

Optimal Frequency Control for Inverter-Based Micro-Grids Using Distributed Finite-Time Consensus Algorithms

Cao

Xie

2020

IEEE Access

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This paper addresses the distributed frequency control and economic dispatch problem of micro-grid systems. The optimal frequency control problem is formulated considering both frequency regulation and generation cost minimization, by establishing an equivalent nonlinear second-order dynamic model. A distributed finite-time consensus protocol is proposed to solve the optimal frequency regulation problem based on the equivalent model. Despite the nonlinear dynamics, the system frequency converges to the nominal value and the economic dispatch is achieved both in finite time. It is proved that the equilibrium point of the closed-loop system is the unique optimal solution to the associated economic dispatch problem. Simulation results verify the theoretical analysis and demonstrate the effectiveness of the proposed control method. INDEX TERMS distributed finite-time control, frequency control, economic dispatch problem, micro-grid hierarchical control

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Distributed Optimal Frequency Control Considering a Nonlinear Network-Preserving Model

Cited by 9 publications

References 0 publications

Asynchronous Distributed Power Control of Multi-Microgrid Systems Based on the Operator Splitting Approach

Asynchronous Distributed Power Control of Multi-Microgrid Systems Based on the Operator Splitting Approach

Decentralized Frequency Control using Packet-based Energy Coordination

Optimal Frequency Control for Inverter-Based Micro-Grids Using Distributed Finite-Time Consensus Algorithms

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