Decentralized DC Voltage and Power Sharing Control of the Parallel Grid Converters in Multi-Terminal DC Power Integration System

Chen, Qi; Wang, Keyou; Yang, Qinmin; Li, Guojie; Huang, Xin; Wu, Jidong; Crow, M.L.

doi:10.1109/tste.2018.2876800

Cited by 12 publications

(4 citation statements)

References 27 publications

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“…We use decentralized control for chargers. The method of decentralized control has the advantages of working independently and not affecting the others [6]. It has high reliability, reasonable system structure, and simple programming.…”

Section: Brt Lrt Artmentioning

confidence: 99%

Predictive Set Point Modulation Charging of Autonomous Rail Transit Vehicles

Liao

Peng

2020

Energies

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Autonomous rail transit (ART) vehicle is a new type of urban rail transportation, which has good development prospects. It is powered by onboard supercapacitors, which are charged at midway stations. It requires short charging time and fast charging speed. Usually, multiple chargers are used in parallel for charging. However, this will cause an overshoot phenomenon during charging, and the overshoot of multiple chargers will be superimposed on the supercapacitor, affecting the stability and life of both supercapacitors and chargers. In this paper, we propose a predictive set point modulation charging method, which can reduce the system’s overshoot and increase the reliability of the system. First, the state-space averaging method is used to establish the electronic physical model of the multicharger system. Secondly, a predictive set point modulation charging control method is designed, and the closed-loop model of the proposed charging system is developed using the buck diagram. The effectiveness of the proposed method is verified through extensive simulation and experiments. The experimental results show that compared with the classical design method, the proposed method can effectively suppress the current overshoot.

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Section: Brt Lrt Artmentioning

confidence: 99%

Predictive Set Point Modulation Charging of Autonomous Rail Transit Vehicles

Liao

Peng

2020

Energies

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“…However, in the case of one or more DGs fault outage, since the condition that m = n i=1 m i = 1 cannot be satisfied, the features from (22) to (25) should be rederived for evaluating the voltage regulation performance. Recallinġ V expressed in (20)- (21) and considering the actual meaning of m, c > 0 can be commonly ensured in most cases by choosing the appropriate parameters k r and µ. Sincev * o and v * o are predefined reference trajectories, V r is apparently bounded, so that it can be processed in a similar way with d in (18). Thus, the first and second assertions of the PCC voltage regulation can still be held.…”

Section: A Pcc Voltage Regulation Performancementioning

confidence: 99%

“…Once the weight coefficients are properly reassigned, the amplitude of the PCC voltage can be restored to its original value in the normal operation. In addition, since this coordination control is only responsible for steady-state performance regulation, only an unidirectional low bandwidth communication link needs to be employed for sending the weight coefficients in certain intervals, and the requirement of the communication is low compared to the droop-based secondary controller, which constantly transmits control signals [21].…”

Section: A Pcc Voltage Regulation Performancementioning

confidence: 99%

Decentralized Control of Multi-Parallel Grid-Forming DGs in Islanded Microgrids for Enhanced Transient Performance

et al. 2019

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This paper proposes a novel decentralized control strategy for multiparallel grid-forming distributed generations (DGs) in an islanded microgrid. Different from most existing droop-based hierarchical control methods, the proposed scheme imposes a fixed system frequency that is independent of the load conditions. Additionally, a proper point of common coupling (PCC) voltage amplitude maintaining and proportional power sharing can be simultaneously achieved when dealing with variations in the load and DGs plug in/off. The transient performance of the system, as well as the power supply reliability, can be improved, as no extra restoration control layer or communications between the inverters are needed. Furthermore, the power-sharing ratio among the DG units can be changed online without affecting the voltage regulation performance, which enhances the power management flexibility. The PCC voltage regulation and the power-sharing performance of the proposed control strategy are ensured via the Lyapunov method. Finally, the effectiveness and practicability of the proposed approach are verified through real-time simulations and hardware experimental tests. INDEX TERMS Improved transient performance, islanded microgrid, multiparallel grid-forming DGs, PCC voltage regulation, proportional power sharing.

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“…us, dc microgrids are getting popular for the integration of renewable sources and dc or dc friendly loads. DC microgrids for data centers, marine systems, and residential applications are reported in [4][5][6][7][8]. It is expected that system efficiency will be increased by 10-22% in dc microgrids [9][10][11].…”

Section: Introductionmentioning

confidence: 99%

Equivalent SM Controller for Load-Sharing and Dynamic Performance in a DC Microgrid Application

Rashad

Raoof

2022

Mathematical Problems in Engineering

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Load-sharing and voltage regulation are key challenges in low voltage dc microgrid systems. Droop-based decentralized control methods are used to control dc grids which cannot achieve these challenges simultaneously due to unequal voltages and load power variations. Centralized control schemes can achieve these challenges using high bandwidth communication. However, the failure of a single central controller can degrade performance and reliability. In addition, cascaded proportional-integral (PI) type controllers are used to control the voltage and current loop of each power electronic converter. These controllers suffer stability and show slower dynamic responses. Furthermore, control parameters cannot be optimized for different operating conditions. To address these challenges, a distributive control method using an equivalent sliding mode (SM) controller utilizing low bandwidth communication is proposed in this paper. The distributive method improves reliability and achieves load sharing and voltage regulation simultaneously. Furthermore, in SM, both voltage and current loop operate in the parallel configuration which improves the dynamic response and shows stability in all operating conditions. To analyze, a system model is developed, and existence and stability conditions are verified. Detailed simulations are carried out to show the steady-state and transient performance. The presented results show the effectiveness of the proposed scheme.

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Decentralized DC Voltage and Power Sharing Control of the Parallel Grid Converters in Multi-Terminal DC Power Integration System

Cited by 12 publications

References 27 publications

Predictive Set Point Modulation Charging of Autonomous Rail Transit Vehicles

Predictive Set Point Modulation Charging of Autonomous Rail Transit Vehicles

Decentralized Control of Multi-Parallel Grid-Forming DGs in Islanded Microgrids for Enhanced Transient Performance

Equivalent SM Controller for Load-Sharing and Dynamic Performance in a DC Microgrid Application

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