Improved secondary control for optimal unbalance compensation in islanded microgrids with parallel DGs

Andishgar, Mohammad Hadi; Gholipour, Mehdi; Hooshmand, Rahmat‐Allah

doi:10.1016/j.ijepes.2019.105535

Cited by 14 publications

(9 citation statements)

References 28 publications

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“…The control techniques based on communication or those without communication can be used for islanded mode operation of the MG [31]- [36]. However, it is economically viable and reliable to use the control technique which does not re- quire communication for its operations.…”

Section: A Islanded Modementioning

confidence: 99%

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A Review on Primary and Secondary Controls of Inverter-interfaced Microgrid

Ahmed

Seyedmahmoudian

Mekhilef

et al. 2021

Journal of Modern Power Systems and Clean Energy

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The demand of electricity and environmental issues associated with conventional power generation plants are increasing significantly. Modern technology has transformed the conventional power system through the integration of distributed generation (DG). With the help of modern power electronic technology, the conventional power system is able to support the integration of DGs based on renewable energy sources (RESs). The systematic combination of DGs with energy storage system forms a microgrid (MG), which can operate in islanded mode or grid-connected mode. The intermittent nature of RES and varying load pose substantial obstacles such as voltage and frequency instability, and the unreliability of RES. Unequal feeder impedances and non-linear loads are considered as present challenges in MG control. Hierarchical control has been useful in undertaking solutions to these issues. This paper covers the deep insight of different control methods applied at the primary and secondary control levels in hierarchical control. In primary control, the classification based on droop and nondroop controls is discussed. The virtual synchronization machine (VSM) based control method is reviewed. Voltage and frequency restoration control and economical operations at decentralized and centralized secondary control are analyzed in detail. Based on the existing literature, critical discussion on MG control and future trends are also presented to provide future research perspectives. Index Terms--Distributed generation (DG), hierarchical control, droop control, non-droop control, inverter.

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Section: A Islanded Modementioning

confidence: 99%

“…The control methods used in this mode are either based on droop concept or uses communication. However, both the types are dependent on local measured variables [31].…”

Section: A Islanded Modementioning

confidence: 99%

A Review on Primary and Secondary Controls of Inverter-interfaced Microgrid

Ahmed

Seyedmahmoudian

Mekhilef

et al. 2021

Journal of Modern Power Systems and Clean Energy

View full text Add to dashboard Cite

show abstract

“…In [24], an auxiliary controller is supplemented to the cascaded hierarchical control scheme of an islanded microgrid to enhance the unbalance and harmonics control and obtain accurate power sharing. In [25] and [26], the enhancement of the voltage quality of critical load bus in microgrids are studied. In [25], low-bandwidth communication (LBC) technology is used to send appropriate signals of the secondary control from the microgrid control center to the primary control; thus, the voltage unbalanced compensation can be achieved.…”

Section: Introductionmentioning

confidence: 99%

“…In [25], low-bandwidth communication (LBC) technology is used to send appropriate signals of the secondary control from the microgrid control center to the primary control; thus, the voltage unbalanced compensation can be achieved. In [26], a complementary part is added to the secondary control loop to limit the voltage unbalance factor at local buses and DG terminals.…”

Section: Introductionmentioning

confidence: 99%

“…However, the conventional cascaded control structure presented in [20]- [26] has inherent drawbacks such as slow response speed, which will dramatically degrade the effect of the compensated and improved control schemes in hierarchical control architecture. Therefore, the main issues associated with the nonlinearity of the loads and dc dynamics will deteriorate the power quality of the voltage source converter (VSC) based microgrids.…”

Section: Introductionmentioning

confidence: 99%

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Decentralized Finite Control Set Model Predictive Control Strategy of Microgrids for Unbalanced and Harmonic Power Management

et al. 2020

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In this paper, a modified decentralized finite control set model predictive control (FCS-MPC) scheme for the distributed energy resources (DERs) is proposed to improve the power management quality of the prosumers integrated microgrids under the condition of harmonic and unbalance loads. The proposed control strategy for the microgrids mainly consists of the power droop controller, the model predictive controller delay compensation, feedback correction and the unbalance compensation mechanism. The feedback correction method is used to correct the delay compensation, which effectively reduces the average switching frequency (ASF) and voltage total harmonic distortion (THD). By sharing the negative sequence reactive power of the microgrid, power distribution between the prosumers' DERs is improved. The DERs in the prosumers can be integrated without any communication wire. The transient response and robustness to parameter changes are far superior to hierarchical cascaded control. Moreover, the proposed control strategy can better suppress harmonic and reduce and share fundamental negative sequence reactive power under microgrid unbalance and nonlinear load conditions. Finally, the effectiveness of the proposed FCS-MPC control strategy is validated by time-domain simulation results and real-time tests with RT-Lab under the condition of unbalanced and nonlinear loads in the microgrids.INDEX TERMS Microgrids, finite control set (FCS), model predictive control (MPC), voltage source converter (VSC), unbalance and harmonics control.

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Unbalance compensation control in microgrids based on the unbalance profile

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Pavani

2021

Electric Power Systems Research

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Improved secondary control for optimal unbalance compensation in islanded microgrids with parallel DGs

Cited by 14 publications

References 28 publications

A Review on Primary and Secondary Controls of Inverter-interfaced Microgrid

A Review on Primary and Secondary Controls of Inverter-interfaced Microgrid

Decentralized Finite Control Set Model Predictive Control Strategy of Microgrids for Unbalanced and Harmonic Power Management

Unbalance compensation control in microgrids based on the unbalance profile

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