A Maximum Power Loading Factor (MPLF) Control Strategy for Distributed Secondary Frequency Regulation of Islanded Microgrid

Shuai, Zhikang; Huang, Wen; Shen, Xia; Li, Yifeng; Zhang, Xin; Shen, Z. John

doi:10.1109/tpel.2018.2837125

Cited by 43 publications

(16 citation statements)

References 24 publications

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“…The adopted model is based on reference [31]. Furthermore,

ρ_{ren}

quantifies the penetration of renewable generation, given by the relation between the total amounts of renewable generation (

P_{ren}

) and active load (

P_{load}

), as given by (28) [19]

ρ_{ren} = \frac{\sum P_{ren}}{\sum P_{load}}

Figs. 5–9 present the main results under different renewable penetration levels.…”

Section: Resultsmentioning

confidence: 99%

“…Here, the update of the reference voltage in each PEC in VSI mode (ΔV Ref ) is estimated following their influences in V viol , as exposed in (14). Thus, from (18), the sensitivity can be done by the partial derivate, as shown in (19)…”

Section: Secondary Control Approachmentioning

confidence: 99%

“…In (19), the terms ΔV Ref and ΔV viol are the reference voltages upstaged necessary to increase ΔV viol in the violated voltage bus, respectively. Therefore, ΔV Ref can be written as (20).…”

Section: Secondary Control Approachmentioning

confidence: 99%

“…Since the frequency is a global variable, decentralised approach via a local frequency controller can be done easier than voltage control [17]. Additionally, the authors of [18,19] consider only frequency regulation in islanded MGs when a dynamic approach with small signal stability is taken into account through proportional-integralderivative (PID) controllers that set new values of the reference frequency.…”

Section: Introductionmentioning

confidence: 99%

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Centralised secondary control for islanded microgrids

Nascimento

Souza

Marujo

et al. 2020

IET Renewable Power Generation

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Electric power systems have undergone substantial changes in their operation. The higher penetration of renewable resources, demand response capability, and generators operating via droop control at the distribution level are the main features resulting in the microgrid concept. Microgrids must operate connected or islanded from the main grid, ensuring reliability and quality in the supply of energy in both operating scenarios. In this sense, the secondary control becomes essential in the system's resilience, since it is responsible for restoring the frequency and voltage within acceptable values. This study proposes a unified frequency and voltage secondary controls for microgrids operating in islanded mode. For this sake, a modification in the load flow algorithm considering a Jacobian matrix takes place, enabling a sensitivity analysis to give the adjustments in the set point of generators. The help of the Levenberg-Marquardt method improves the convergence in the modified load flow. All generators are continuously considered in this process, regarding their capabilities and relative control sensitivities concerning the operation point restoration. The proposed methodology is validated in a modified IEEE-37 node test feeder, showing the efficacy of the centralised secondary control under different scenarios of renewable generation penetration and load levels.

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“…The adopted model is based on reference [31]. Furthermore,

ρ_{ren}

quantifies the penetration of renewable generation, given by the relation between the total amounts of renewable generation (

P_{ren}

) and active load (

P_{load}

), as given by (28) [19]

ρ_{ren} = \frac{\sum P_{ren}}{\sum P_{load}}

Figs. 5–9 present the main results under different renewable penetration levels.…”

Section: Resultsmentioning

confidence: 99%

Section: Secondary Control Approachmentioning

confidence: 99%

Section: Secondary Control Approachmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Centralised secondary control for islanded microgrids

Nascimento

Souza

Marujo

et al. 2020

IET Renewable Power Generation

View full text Add to dashboard Cite

show abstract

“…To eliminate the dependence on MGCC and improve system reliability, distributed secondary control schemes have thus been proposed, which are implemented in DG local controllers with the help of DG-to-DG communications [12]- [22]. Averaging-based [12]- [13] and consensus-based [14]- [18] techniques are two representative distributed methods.…”

Section: Introductionmentioning

confidence: 99%

A Small-AC-Signal Injection-Based Decentralized Secondary Frequency Control for Droop-Controlled Islanded Microgrids

Liu

et al. 2020

IEEE Trans. Power Electron.

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In an islanded microgrid composed of droopcontrolled parallel inverters, the system frequency endures deviations as the load changes. To compensate for frequency deviation without involving communication infrastructures among distributed generators (DGs), the proportional-integral regulator based secondary frequency control (PI-SFC) method has been proposed in the literature. However, PI-SFC may incur real power-sharing errors because the integrator accumulates disturbances and noise in each DG, leading to different compensation values of nominal real power. To achieve frequency restoration while maintaining equal real power sharing among DGs, this paper proposes a small-AC-signal injection-based secondary frequency control (SACS-SFC) method, which is implemented by injecting an additional AC signal into the output voltage of each DG. Furthermore, a droop relation between the frequency of the injected SACS and the compensation value of nominal real power is innovatively established to trim the output real power of each DG to be equal. Frequency deviations caused by primary droop control are thus eliminated, and even real power sharing can be maintained among DGs. Moreover, the control parameters of the proposed SACS-SFC are comprehensively designed via steady-state and dynamic model of the system. Simulation and experimental results demonstrate the effectiveness of the proposed method.

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Modeling and adaptive control strategy of hybrid microgrid based on virtual synchronous generator

2023

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Aiming at large system operation fluctuations caused by the technical control of virtual synchronous generators, this article studies the introduction of interface converter control power, builds a virtual synchronous generator (VSG)‐based hybrid microgrid model and adaptive control strategy. Finally it optimizes it with fuzzy logic to obtain an fuzzy logic controller (FLC) based adaptive VSG control strategy. The experimental results show that under the FLC‐based adaptive VSG control strategy, in the reverse current mode, the system regression time is 0.37 s, and the DC bus voltage is 6.5 V; In the rectification mode, the system regression time is 0.49 s, and the DC bus voltage is 2.1 V. The results obtained are faster than the traditional VSG control strategy, and the DC bus voltage is 42.48%–68.66% lower. In summary, the suggested control approach is effective and reliable under the two operation modes, which can make the system operate safely and stably.

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A Maximum Power Loading Factor (MPLF) Control Strategy for Distributed Secondary Frequency Regulation of Islanded Microgrid

Cited by 43 publications

References 24 publications

Centralised secondary control for islanded microgrids

Centralised secondary control for islanded microgrids

A Small-AC-Signal Injection-Based Decentralized Secondary Frequency Control for Droop-Controlled Islanded Microgrids

Modeling and adaptive control strategy of hybrid microgrid based on virtual synchronous generator

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