Self-synchronizing Series-connected Inverters

Achanta, Prasanta K.; Sinha, Mohit; Johnson, Brian; Dhople, Sairaj V.; Maksimović, Dragan

doi:10.1109/compel.2018.8459975

Cited by 7 publications

(6 citation statements)

References 15 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…vibration mode takes place, the former condition is essential to make oscillations conservative, the latter is justified by the fact that k b affects only the transient and it does not contribute to the mode frequency since the base behaves as a single inelastic body. Equations ( 26)-( 28) correspond to the modular electric circuit, as depicted in Fig 6 . The schematic is significant because it may be exploited to synchronize an array of series-connected converters, thus maximizing the overall peak voltage [32], [34].…”

Section: Impedance Analogymentioning

confidence: 99%

“…The two modular topologies so obtained are made exclusively of linear components; hence, they can be studied by the wellestablished theory on linear systems. Also, to the best of the authors' knowledge, the article presented in [32] is the only study available in the literature concerning a circuit made of seriesconnected units capable to spontaneously synchronize without resorting to a communication network; however, the proposed controller emulates a nonlinear oscillator rather than a linear one as that presented in the following of our research. Furthermore, another point of novelty of the present investigation is the design of a distributed voltage-source controller through the emulation of the electrical circuit suitable for the communicationless synchronization of parallel-connected inverters.…”

mentioning

confidence: 99%

See 1 more Smart Citation

On the Synchronization of Parallel Power Converters via Emulation of Linear Mechanical Oscillators

Dalboni

Soldati

2024

IEEE/ASME Trans. Mechatron.

View full text Add to dashboard Cite

There exist some modular mechanical systems that exhibit inherent synchronization capabilities. Among these, arrays of pendula connected to the same moving platform, under some particular conditions that are analyzed in this work, tend to approach the synchronous in-phase or antiphase motion. Such an appealing behavior can be replicated within modular electronic circuits equipped with multiple power converters to achieve the coordination of all units. The approach consists in recasting the mechanical equations of motion of interconnected pendula to the equivalent electrical circuit by impedance or mobility analogy. This allows obtaining a self-synchronizing network without the need of explicit communication between the modules. The effectiveness of the proposed distributed controller is assessed through experimental tests. Therefore, the fundamental points of novelty are the derivation of two (series and parallel) self-synchronizing electrical linear circuits through analogy with mechanical models and the introduction of a distributed voltage-source controller for parallel operation of converters based on a fully linear model. The proposed methodology is effective for both parallel-output converters with independent inputs (as in microgrid applications) and parallel-input and paralleloutput converters (as in high-current applications).

show abstract

Section: Impedance Analogymentioning

confidence: 99%

mentioning

confidence: 99%

On the Synchronization of Parallel Power Converters via Emulation of Linear Mechanical Oscillators

Dalboni

Soldati

2024

IEEE/ASME Trans. Mechatron.

View full text Add to dashboard Cite

show abstract

“…In [13], an inverse active power versus power factor droop method is proposed to control active power flow. In [14], a virtual oscillator-based controller is implemented to synchronize the inverter voltages and share the load. However, these approaches are limited to islanded settings and only considers unidirectional power flow.…”

Section: Sourcementioning

confidence: 99%

Decentralized Control of Cascaded H-Bridge Inverters for Medium-Voltage Grid Integration

Dutta

Mallik

et al. 2020

2020 IEEE 21st Workshop on Control and Modeling for Power Electronics (COMPEL)

Self Cite

View full text Add to dashboard Cite

This paper introduces a fully decentralized control strategy that allows for individualized active and reactive power control of H-bridge inverters connected in series. After formulating a model of the system power flows, we outline a communications-free approach where each inverter can act on independent commands. Inverter-level feedback is accomplished locally via a measurement of current flowing through the stack.A key feature is the lack of any centralized control routines or phase-locked loop. In this framework, the reactive power control loops achieve voltage synchronization among the converters and the grid, and the active power control loops modulate the terminal voltage amplitudes that influence power delivery. Furthermore, pole placement via state feedback is used to ensure stability of voltage synchronization while also enabling tracking of bidirectional power commands. Simulations are presented to validate the proposed approach.

show abstract

“…Decentralized strategies of cascaded inverters can overcome these drawbacks of the centralized control mentioned above, because each module only needs its local information to achieve synchronization and power sharing without communication. Due to the peer-to-peer structure, decentralized control has more advantages in terms of cost and reliability, so it is increasingly valued [18][19][20][21][22][23]. In [19], a virtual oscillator-based controller is implemented to synchronize the inverter voltages and share the load.…”

Section: Introductionmentioning

confidence: 99%

“…Due to the peer-to-peer structure, decentralized control has more advantages in terms of cost and reliability, so it is increasingly valued [18][19][20][21][22][23]. In [19], a virtual oscillator-based controller is implemented to synchronize the inverter voltages and share the load. However, this approach is only applicable to the island mode.…”

Section: Introductionmentioning

confidence: 99%

A decentralized control strategy for single‐phase cascaded photovoltaic inverters with MPPT ability

Luo

Qin

Feng

et al. 2023

IET Renewable Power Gen

View full text Add to dashboard Cite

Cascaded inverters can improve efficiency and reduce cost, so it is widely used in photovoltaic (PV) grid connected power generation system. However, aging or partial shielding of PV panels will lead to their different maximum power points (MPP). This paper proposes a decentralized control strategy for grid‐connected cascaded PV inverters without any communication, which is capable of integrating PV inverters of different capacities connected in series into the grid, and enable them to achieve maximum power point tracking (MPPT) independently. Compared with the traditional centralized control method relying on real‐time communication, the proposed scheme has advantages of improved reliability and decreased costs. The overall system stability is analysed, and the stability condition is derived as well. The Hardware‐In‐the‐Loop test results show that all the inverters in the cascaded system have their output frequency and voltage phase synchronized autonomously, and achieve MPPT independently even in the presence of variation of light condition. Thus, the feasibility of the proposed method is verified.

show abstract

Self-synchronizing Series-connected Inverters

Cited by 7 publications

References 15 publications

On the Synchronization of Parallel Power Converters via Emulation of Linear Mechanical Oscillators

On the Synchronization of Parallel Power Converters via Emulation of Linear Mechanical Oscillators

Decentralized Control of Cascaded H-Bridge Inverters for Medium-Voltage Grid Integration

A decentralized control strategy for single‐phase cascaded photovoltaic inverters with MPPT ability

Contact Info

Product

Resources

About