Control strategy of the bi-directional converter for hybrid AC/DC microgrid

Hu, Wenyan; Chen, Hongkun; Xiaonan, Yang; Xu, Kun; Pan, Hongbin

doi:10.1109/appeec.2015.7380923

Cited by 16 publications

(15 citation statements)

References 3 publications

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“…The standardized frequency and voltage have the same scale, and their variation ranges are both (0-1). The new droop control expressions of a single DG are shown in (12) and (13).…”

Section: Control Theorymentioning

confidence: 99%

“…Considering that the fluctuation of transmission power may pose a threat to the system stability, constructing an appropriate control scheme for a bidirectional AC/DC converter to determine a befitting power flow is of great significance. Yu Ji et al and Wenyan Hu et al [12,13] both proposed a control method for the bidirectional converter, while they expressed the imbalance of power sharing indirectly by the deviation of voltage and frequency rather than establish a direct relationship between the active power of AC and DC subnets, thus may bring about inaccurate power sharing with the participation of secondary control within subnets. Xialin Li et al [14] analyzed the operation mode of the bidirectional converter in different scenarios roundly and generalized the control method.…”

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confidence: 99%

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A Cooperative Control Scheme for AC/DC Hybrid Autonomous Microgrids

Sheng

Hong

et al. 2020

Processes

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The AC/DC hybrid microgrid (MG) has been widely promoted due to its high flexibility.The capability to operate in islanding mode is an appealing advantage of the MG, and also sets higher requirements for its control system. A droop control strategy is proposed on account of its distinguishing feature of automatic power sharing between distributed generations (DGs), but it introduces some drawbacks. Therefore, distributed cooperative secondary control is introduced as an improvement. In order to optimize the active power sharing in AC/DC hybrid microgrids, a number of cooperative control strategies have been proposed. However, most studies of AC/DC hybrid microgrids have mainly focused on the control of the bidirectional converter, ignoring the effects of secondary control within subnets, which may make a difference to the droop characteristic. This paper extends the cooperative control to AC/DC hybrid microgrids based on normalizing and synthesizing the droop equations, and proposes a global cooperative control scheme for AC/DC autonomous hybrid microgrids, realizing voltage restoration within AC and DC subnets as well as accurate global power sharing. Ultimately, the simulation results demonstrate that the proposed control scheme has a favorable performance in the test AC/DC hybrid system. Processes 2020, 8, 311 2 of 15can realize the global optimization of MG effectively, but the high communication cost and low reliability in complex systems limit its development [5]. The proposal of the distributed control scheme [6,7] can effectively reduce the scale of data transmission, so as to realize the global control of the complex system with low communication cost. Dehkordi et al. [8] proposed a complete hierarchical control strategy for AC microgrids and Chunxia Dou et al.[9] designed a superior distributed cooperative controller for DC microgrids with commendable dynamic performance. Fanghong Guo et al. [10] designed an efficient secondary controller with the superiority of less information transmission and demonstrated its excellent performance in DC microgrids. These above−mentioned studies only focused on one separate microgrid, while the control of hybrid microgrids needs to consider the coordination between AC and DC systems, which will be more complex [11]. Considering that the fluctuation of transmission power may pose a threat to the system stability, constructing an appropriate control scheme for a bidirectional AC/DC converter to determine a befitting power flow is of great significance. Yu Ji et al. and Wenyan Hu et al. [12,13] both proposed a control method for the bidirectional converter, while they expressed the imbalance of power sharing indirectly by the deviation of voltage and frequency rather than establish a direct relationship between the active power of AC and DC subnets, thus may bring about inaccurate power sharing with the participation of secondary control within subnets. Xialin Li et al. [14] analyzed the operation mode of the bidirectional converter in different scenarios roundly and gen...

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“…The standardized frequency and voltage have the same scale, and their variation ranges are both (0-1). The new droop control expressions of a single DG are shown in (12) and (13).…”

Section: Control Theorymentioning

confidence: 99%

mentioning

confidence: 99%

A Cooperative Control Scheme for AC/DC Hybrid Autonomous Microgrids

Sheng

Hong

et al. 2020

Processes

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“…Q = . Therefore, in this paper, the consumption of reactive power is all provided within the AC sub-microgrid, reducing its burden of power transmission [27].…”

Section: According To Acmentioning

confidence: 99%

An Improved Harmonic Suppression Control Strategy for the Hybrid Microgrid Bidirectional AC/DC Converter

Wang

2020

IEEE Access

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“…Reference active and inactive power are all calculated by the power sharing partshown in Fig. 6 and they can be regulated separately by synchronverter relying on the mathematic model presented in (9) and (10).…”

Section: B Application Of Synchronverter Technology In Ilcsmentioning

confidence: 99%

Improved Control Strategy of Interlinking Converters With Synchronous Generator Characteristic in Islanded Hybrid AC/DC Microgrid

Chen

2017

CPSS TPEA

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Abstract-In this paper, an improved control strategy of interlinking converters for hybrid AC/DC microgrid operated in islanding mode is proposed, which applies synchronous generator model to the converters. This enhanced scheme adopts direct frequency control method to realize active power sharing and improves the transient frequency stability by using synchronverter technology. Unlike existing droop control methods of interlinking converters that mostly just focus on power sharing, this scheme can not only maintain proportional power distributed between DC and AC subgrid, but also regulate the AC subgrid voltage directly to improve its poor frequency stability during ACside loading transitions in autonomous operation. It's noteworthy that this scheme can also keep the AC-side loads working uninterruptedly during AC subgrid faults events by using voltage-controlled method. Moreover, any additional energy storage or inverters are not required to assist interlinking converters for microgrid frequency regulation. The effectiveness of this modified control method is verified by offline time-domain simulation and real-time experiment in MATLAB/Simulink and OPAL-RT digital platform respectively. Index Terms-Frequency transient stability, hybrid AC/DC microgrid, interlinking converter, proportional power sharing, sychronverter.

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Control strategy of the bi-directional converter for hybrid AC/DC microgrid

Cited by 16 publications

References 3 publications

A Cooperative Control Scheme for AC/DC Hybrid Autonomous Microgrids

A Cooperative Control Scheme for AC/DC Hybrid Autonomous Microgrids

An Improved Harmonic Suppression Control Strategy for the Hybrid Microgrid Bidirectional AC/DC Converter

Improved Control Strategy of Interlinking Converters With Synchronous Generator Characteristic in Islanded Hybrid AC/DC Microgrid

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