Multifunctional Three-Phase Four-Leg PV-SVSI With Dynamic Capacity Distribution Method

Hossain, M. J.; Rafi, Fida Hasan Md; Town, Graham; Lu, Junwei

doi:10.1109/tii.2018.2805913

Cited by 24 publications

(15 citation statements)

References 21 publications

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“…where Hd = 1/sLcd, according to Equations (8), (12) and (13), the ΦO_d of the multi-parallel HCGIs system with the virtual inductance is rewritten as:…”

Section: Gpr Kpwm Gl1 Gc Gl2mentioning

confidence: 99%

“…In this paper, the expected improved bandwidth frequency f B is 1250 Hz (25th order harmonic) which is the highest harmonic current frequency of a single HCGI system. According to references [10][11][12][13][14][15][16], if K O_d is greater than 0.5 at high frequency section, the performance of harmonic compensation is acceptable. Besides, according to references [17][18][19][20][21], if the system gain K O_d smaller than 0.2, the resonant peak can be effectively suppressed.…”

Section: Design Of the Feedback Constantmentioning

confidence: 99%

“…Different from the traditional grid, which is equipped with active power filters to compensate the harmonic current, harmonic-compensation grid-connected inverters (HCGIs) having the function of harmonic-compensation while ensuring the power output are employed in distributed generation systems. The HCGIs cut the cost of harmonic compensation, reduce the device size, and greatly improve the equipment utilization rate of grid-connected inverters [12][13][14][15][16][17][18].…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Wide Bandwidth Control for Multi-Parallel Grid-Connected Inverters with Harmonic Compensation

Deng

Song

et al. 2019

Energies

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This paper proposes a virtual impedance-based bandwidth control method for multi-parallel harmonic-compensation grid-connected inverters (HCGIs). Firstly, the influence of the resonance points caused by the interaction of multiple HCGIs on the control bandwidth is analyzed, and the analysis result shows that the control bandwidth becomes narrow due to the appearance of a new resonance point. Then, to increase the control bandwidth of multi-parallel HCGIs, six different types of virtual impedance circuits are constructed and compared, and the bandwidth control method based on virtual impedance by capacitor voltage feedback is proposed. Following that, the relationship between feedback coefficient and bandwidth is established, the design approach of parameters for the proposed method is presented. Finally, the proposed method is confirmed by the simulation and experimental tests. The simulation and experimental results show that the proposed control method can effectively shift resonance frequencies right to solve the issue of control bandwidth reduction in multi-parallel HCGIs systems, while without affecting the low-frequency harmonic current compensation.

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“…where Hd = 1/sLcd, according to Equations (8), (12) and (13), the ΦO_d of the multi-parallel HCGIs system with the virtual inductance is rewritten as:…”

Section: Gpr Kpwm Gl1 Gc Gl2mentioning

confidence: 99%

Section: Design Of the Feedback Constantmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Wide Bandwidth Control for Multi-Parallel Grid-Connected Inverters with Harmonic Compensation

Deng

Song

et al. 2019

Energies

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show abstract

“…= − ∑ ( , , 0) ( , , 0) The VSI is modelled to provide stable DC and AC side voltage and current. The mathematical model of the PV-VSI system is represented as in Reference [9]:…”

Section: System Descriptionmentioning

confidence: 99%

“…However, none of these researches have considered higher capacity requirement. Authors in Reference [9] propose a dynamic capacity distribution method to compensate for the neutral current utilizing the maximum capacity of the VSI in a Microgrid (MG) but no communication system in presented. Authors in References [10,11] have employed conservative power theory to share the residual neutral current among the VSIs in an MG.…”

mentioning

confidence: 99%

Internet of Things Platform for Energy Management in Multi-Microgrid System to Improve Neutral Current Compensation

et al. 2018

Self Cite

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In this paper, an Internet of Things (IoT) platform is proposed for Multi-Microgrid (MMG) system to improve unbalance compensation functionality employing three-phase four-leg (3P-4L) voltage source inverters (VSIs). The two level communication system connects the MMG system, implemented in Power System Computer Aided Design (PSCAD), to the cloud server. The local communication level utilizes Modbus Transmission Control Protocol/Internet Protocol (TCP/IP) and Message Queuing Telemetry Transport (MQTT) is used as the protocol for global communication level. A communication operation algorithm is developed to manage the communication operation under various communication failure scenarios. To test the communication system, it is implemented on an experimental testbed to investigate its functionality for MMG neutral current compensation (NCC).To compensate the neutral current in MMG, a dynamic NCC algorithm is proposed, which enables the MGs to further improve the NCC by sharing their data using the IoT platform. The performance of the control and communication system using dynamic NCC is compared with the fixed capacity NCC for unbalance compensation under different communication failure conditions. The impact of the communication system performance on the NCC sharing is the focus of this research. The results show that the proposed system provides better neutral current compensation and phase balancing in case of MMG operation by sharing the data effectively even if the communication system is failing partially.Energies 2018, 11, 3102 2 of 22 control the neutral current directly [3], where the 3P-4L voltage source inverter (VSI) provides better unbalance compensation than other active and passive methods [4]. Traditionally, a fixed portion of the 3P-4L converter capacity is specified to compensate the neutral current. However, the drawback of this method is in case of higher neutral current compensation (NCC) necessity, where it can lead to increased capacity of the 3P-4L compensator [5]. Authors in Reference [6] employed the 3P-4L VSI with PV installation to compensate for the neutral current but case scenarios for network interaction with different loads are not presented. A fixed capacity neutral current compensation method employing 3P-4L VSI under various load scenarios for network contingencies cases is proposed in Reference [7]. Furthermore, the 3P-4L VSI is used to eliminate the leakage current from PV installations [8]. However, none of these researches have considered higher capacity requirement. Authors in Reference [9] propose a dynamic capacity distribution method to compensate for the neutral current utilizing the maximum capacity of the VSI in a Microgrid (MG) but no communication system in presented. Authors in References [10,11] have employed conservative power theory to share the residual neutral current among the VSIs in an MG. Although a communication system have been employed, its operational details are not presented. Cloud-based Internet of Things (IoT) platforms to manage energy of building...

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Simultaneous voltage unbalance compensation and neutral‐to‐ground voltage minimization for an islanded mini‐grid using model predictive control

Ayoubi

Miveh

Ghadimi

et al. 2022

Energy Science & Engineering

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This paper presents a model predictive control (MPC) and its application on a three‐phase four‐leg inverter in an islanded mini‐grid to compensate for unbalanced load conditions while minimizing the neutral‐to‐ground voltage (NGV). The proposed approach uses the novel discrete‐time model of the four‐leg inverter and LC filter to predict the control variables. These predictions are evaluated by using a multiobjective cost function. The proposed method is based on the minimization of the cost function to select the best vector state of the power converter to be applied in the next sampling instance. The cost function in this study has two objectives: the adequately tracked low voltage reference and minimization of the NGV, simultaneously. The stability analysis is also defined to investigate the stable dynamics of the proposed MPC. The effectiveness of the suggested method is verified through simulations considering the single/three‐phase and balanced/unbalanced loads. The distinguished results of the proposed work indicate that the proposed MPC algorithm provides high power quality under unbalanced and nonlinear load conditions with high stability. The robustness of the proposed controller is also studied with both inductive and capacitive filter parameter variations.

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Multifunctional Three-Phase Four-Leg PV-SVSI With Dynamic Capacity Distribution Method

Cited by 24 publications

References 21 publications

Wide Bandwidth Control for Multi-Parallel Grid-Connected Inverters with Harmonic Compensation

Wide Bandwidth Control for Multi-Parallel Grid-Connected Inverters with Harmonic Compensation

Internet of Things Platform for Energy Management in Multi-Microgrid System to Improve Neutral Current Compensation

Simultaneous voltage unbalance compensation and neutral‐to‐ground voltage minimization for an islanded mini‐grid using model predictive control

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