PQ-Coupling Strategy for Droop Control in Grid-Connected Capacitive-Coupled Inverter

Lao, Keng-Weng; Deng, Wenyang; Sheng, Jing-Jing; Dai, Ningyi

doi:10.1109/access.2019.2902314

Cited by 20 publications

(8 citation statements)

References 29 publications

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“…Since the grid impedance in a PEDG is neither purely resistive nor inductive, the active and reactive power droop relations are not fully decoupled either. Thus, modified droop relations [26] that generate references for the GFM operation are given by,…”

Section: B Grid Connected Inverter (Gci)mentioning

confidence: 99%

Towards Resiliency Enhancement of Network of Grid-Forming and Grid-Following Inverters

D’silva

Zare

Shadmand

et al. 2024

IEEE Trans. Ind. Electron.

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This paper proposes an autonomous control scheme to mitigate voltage-frequency excursions observed in a network of grid forming (GFM) and grid following (GFL) inverters in a power electronics dominated grid (PEDG). The proposed control scheme leverages GFL inverter's ability to dynamically adjust their power set-points as well as change their operation mode on-the-fly to enhance the PEDG resiliency. A supervisory controller (SC) comprising of a Droop-ΔP estimator coupled with an optimal power allocator (OPA) module dynamically adjusts the power injections from GFL inverters to maintain the power balance and restore frequency in response to disturbances. Moreover, the proposed self-ranking based coordinated mode selection (SR-CMS) algorithm dynamically reconfigures the inverter's operation mode (either GFM or GFL) to enhance the PEDG resiliency in response to events and ensure GFM inverter allocation in grid clusters. Several case studies are performed to validate the feasibility, performance, and robustness of proposed autonomous control. Finally, the proposed scheme is experimentally validated on a small-scale hardware testbed.

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Section: B Grid Connected Inverter (Gci)mentioning

confidence: 99%

Towards Resiliency Enhancement of Network of Grid-Forming and Grid-Following Inverters

D’silva

Zare

Shadmand

et al. 2024

IEEE Trans. Ind. Electron.

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show abstract

“…Specifically, assessment indexes (NoRavP, NoRavQ, SeQ, SeP) are calculated according to the response of the converter to the control inputs, only. This response is compared to an ideal, perfectly decoupled response, formulated in Equations (9)- (13) and Equations (15)- (17), which also does not require any knowledge of the control approach under assessment. However, the assessment process requires access to controller's power set points (to create disturbances) and input signals (to measure response).…”

Section: Conditions For Secure and Reliable Calculation Of Indexesmentioning

confidence: 99%

Assessment Indexes for Converter P-Q Control Coupling

2020

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This work presents a concise methodology for the calculation of assessment indexes regarding the coupling between active and reactive power control observed on distribution level converters. First, the reader is introduced to the concept of power coupling; when, where and how it appears in power control of converters. A brief summary of the theory and formulation behind it is also included, together with relevant literature. Then, the methodology for the assessment of active and reactive power control performance of any grid-connected converter is presented. The impact of small control disturbances during a testing procedure is monitored, analyzed and converted to meaningful indexes, so that the type and level of coupling is quantified without putting the converter or the grid at risk. The efficiency of the methodology to assess the type and level of coupling is verified experimentally. This is done by assessing several power control approaches with different level of decoupling efficiency on the same power converter connected to a distribution grid. While the assessment is performed with safe, minimal disturbances, its exceptional accuracy is later confirmed by the level and type of coupling observed during significant power step changes.

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“…Using specifically designed parameters, the virtual-impedance could also tune the resistive and capacitive feeder impedances and maintain satisfactory power-sharing (Liu et al, 2019b)- (He et al, 2019). Furthermore, by revising the control algorithm, droop control could be enhanced to compensate for inaccurate power-sharing (Lao et al, 2019).…”

Section: Introductionmentioning

confidence: 99%

A neural network-based adaptive power-sharing strategy for hybrid frame inverters in a microgrid

et al. 2023

Self Cite

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The capacitive-coupling inverter (CCI) is more cost-effective in reactive power conditioning and enhanced reactive power regulation ability when compared with the inductive-coupling inverter (ICI). As power conditioning capability is vital for a microgrid (MG) system, a new MG frame with hybrid parallel-connected ICIs and CCIs was proposed in this paper. With lower DC-link voltage for the CCI, an adaptive power sharing method was proposed for reducing total rated power and losses. A power-sharing control layer based on a back-propagation neural network that guarantees rapid and accurate sharing ratio computation was investigated as well. The results of simulations and experiments were used to verify the effectiveness of the proposed method.

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PQ-Coupling Strategy for Droop Control in Grid-Connected Capacitive-Coupled Inverter

Cited by 20 publications

References 29 publications

Towards Resiliency Enhancement of Network of Grid-Forming and Grid-Following Inverters

Towards Resiliency Enhancement of Network of Grid-Forming and Grid-Following Inverters

Assessment Indexes for Converter P-Q Control Coupling

A neural network-based adaptive power-sharing strategy for hybrid frame inverters in a microgrid

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