A survey of control methods for three-phase inverters in parallel connection

Prodanović, Milan; Green, T.C.; Mansir, H.

doi:10.1049/cp:20000293

Cited by 90 publications

(60 citation statements)

References 2 publications

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“…In other approaches [2], [3], [17], the transient current is shared equally. In a distributed control system, both the local and central control loops will act during the transient.…”

Section: Transientsmentioning

confidence: 99%

“…When inverters are closely connected, the introduction of a communication link can improve the performance of the system. In [17], it was shown that the power-sharing and power-quality performance depend on the bandwidth of the communication link.…”

Section: Communication Linksmentioning

confidence: 99%

“…The principle of distributed control is to divide the control action between the central controller and the local controllers through a frequency partition: the central controller is responsible for ensuring proper following of a reference voltage that is by its nature limited to low-frequency terms and the local controllers are responsible for rejecting high-frequency disturbances, [17], [20]. The signal distributed from the central controller to local units is only the low-frequency part of the drive signal and can be passed through a communication link of limited bandwidth.…”

Section: Distributed Control Through Frequency Partitionmentioning

confidence: 99%

“…From the control structure shown in Fig. 3, the open loop transfer function of the voltage control is derived as in (17). The transfer function assumes no-load condition (worst case scenario for the stability) and consists of the series connection of the voltage controller, current controller G S (s) and inverter filter capacitance of C = 50 µF…”

Section: Example Of Distributed Control Of a Multiple Inverter Systemmentioning

confidence: 99%

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High-Quality Power Generation Through Distributed Control of a Power Park Microgrid

Prodanović

Green

2006

IEEE Trans. Ind. Electron.

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288

127

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Abstract-Inverters are a necessary interface for several forms of distributed generation (DG) and where they form a microgrid they have the potential to offer high power quality. The challenge is to coordinate the actions of a group of inverters so that they offer the level of power quality known to be possible from fast local control of a single inverter. The case examined here is a power park of several inverter-based DG in relatively close proximity. A basic requirement is that the inverters regulate the grid voltage and share the real and reactive power demands according to their ratings. In small girds with high proportions of nonlinear and unbalanced loads it is also important to actively control the waveform quality in terms of harmonics, transient disturbances, and balance. Further, it is important that these duties are shared equally between the units rather than having one master unit taking the lead in the voltage control function. A constraint faced in designing a sharing system is the limited bandwidth of signal communication even over distances of a few meters. A control method is proposed that separates the control tasks in the frequency domain. Power sharing and voltage regulation are controlled centrally and commands are distributed through a low-bandwidth communication link. Waveform quality functions are controlled in high bandwidth controllers distributed to each local inverter. Experimental tests on a grid of three 10-kVA inverters are used to show that the method fully exploits the inherent fast response of the inverters while also ensuring voltage balance even with extreme load imbalance. It is shown that circulating currents are avoided during steady state and transients.

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“…In other approaches [2], [3], [17], the transient current is shared equally. In a distributed control system, both the local and central control loops will act during the transient.…”

Section: Transientsmentioning

confidence: 99%

Section: Communication Linksmentioning

confidence: 99%

Section: Distributed Control Through Frequency Partitionmentioning

confidence: 99%

Section: Example Of Distributed Control Of a Multiple Inverter Systemmentioning

confidence: 99%

See 2 more Smart Citations

High-Quality Power Generation Through Distributed Control of a Power Park Microgrid

Prodanović

Green

2006

IEEE Trans. Ind. Electron.

Self Cite

288

127

View full text Add to dashboard Cite

show abstract

“…The first one is based on a communication link, such as in [6,[9][10][11]. In these studies, the master-slave scheme is applied.…”

Section: Introductionmentioning

confidence: 99%

Stability preservation and power management in autonomous microgrids using adaptive nonlinear droop scheme

Nourollah¹,

Pirayesh²,

Divshali³

2015

Turk J Elec Eng & Comp Sci

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This paper proposes sharing active and reactive power in autonomous voltage source inverter (VSI)-based microgrids with no physical communication links. In decentralized VSI-based microgrids, when the demand or generation changes, the output voltage of distributed generation units and the frequency of the system will also change. This study presents a novel adaptive nonlinear droop (ANLD) scheme for preserving network stability, improving the system's dynamics, and controlling power sharing in multibus microgrids in a decentralized manner. Subcontrollers are modeled in a state space and combined together so that a complete dynamic model of the network can be developed. Note that controller coefficients are optimized to improve small-signal stability and to obtain a good operating point. To this end, an optimization problem is formulated and solved using the particle swarm optimization method. For the purposes of comparison, the proposed ANLD method and three other schemes are applied to two case studies: a 5-bus microgrid and a modified 37-bus IEEE microgrid. The stability margin analysis and time response simulations prove that the proposed algorithm performs much better and can be applied to large-scale microgrids.

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An enhanced master–slave control for accurate load sharing among parallel standalone AC microgrids

Govind

Suryawanshi

Nachankar

et al. 2022

Circuit Theory & Apps

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Summary With the advancement of power electronic converters over the last few decades, the capability to integrate solar photovoltaics, wind, diesel generators, batteries, ultracapacitor, and electric vehicles with standalone networks or utility grids has increased. For the reliable operation of standalone networks, accurate load sharing among these sources is required. As a result, several load sharing schemes with inherent merits and related demerits are presented in the literature. This work intends to address shortcomings of earlier reported control schemes with the inheritance of associated merits using the proposed control scheme. The proposed enhanced Master–Slave control, with advanced droop control scheme, is illustrated for Master voltage source inverter with resistive line impedance and improves the steady‐state response by improving voltage and frequency profile. It reduces the voltage drop caused by load effect and droop effect, allowing the voltage and frequency regulation during load changes and distinct load conditions such as balanced linear load, unbalanced linear load, and balanced nonlinear load in standalone alternating current (AC) microgrids. Furthermore, Slave voltage source inverters independently compensate for local load demand. This paper presents precise current control and voltage control design methodology and a mathematical model for voltage control and their performance analysis in time and frequency domain. Finally, the proposed enhanced Master–Slave control for accurate load sharing among parallel standalone AC microgrids validated using real‐time simulator and experimental results is provided to verify the effectiveness of the proposed control scheme.

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A survey of control methods for three-phase inverters in parallel connection

Cited by 90 publications

References 2 publications

High-Quality Power Generation Through Distributed Control of a Power Park Microgrid

High-Quality Power Generation Through Distributed Control of a Power Park Microgrid

Stability preservation and power management in autonomous microgrids using adaptive nonlinear droop scheme

An enhanced master–slave control for accurate load sharing among parallel standalone AC microgrids

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