Minimization of the DC Component in Transformerless Three-Phase Grid-Connected Photovoltaic Inverters

Yan, Qingzeng; Wu, Xiaojie; Yuan, Xibo; Geng, Yiwen; Zhang, Qi

doi:10.1109/tpel.2014.2350485

Cited by 42 publications

(25 citation statements)

References 35 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Based on the internal model principle, the resonance controller can be used to track alternating signals without any steady-state errors. Thus the PIR controller [42] can be adopted to replace the PI controller in order to eliminate the tracking error. The block diagram of the PIR controller is shown in Figure 8.…”

Section: Improved Position Estimator Based On Pir Controllermentioning

confidence: 99%

An Improved Sensorless Vector Control Method for IPMSM Drive with Small DC-Link Capacitors

Yin

Luo

et al. 2020

Energies

View full text Add to dashboard Cite

In this paper, an improved sensorless vector control method for an interior permanent magnet synchronous motor (IPMSM) drive with small DC-link capacitors is proposed. First, a fast sliding-mode observer was applied, to enlarge the observer bandwidth. Then, an improved estimator based on a proportional integral resonant controller was designed for the estimate speed shaping, which means the actual speed can be tracked. This not only reduces the position estimate error, but also enhances the grid power factor and suppresses the input current harmonics. Simulation and experiments were conducted on a sensorless IPMSM drive system with a small film capacitor. The effectiveness of the proposed estimation method was verified by the simulation and experimental results. The estimated error was reduced and the grid current harmonics satisfy the requirements of EN61000-3-2.

show abstract

Section: Improved Position Estimator Based On Pir Controllermentioning

confidence: 99%

An Improved Sensorless Vector Control Method for IPMSM Drive with Small DC-Link Capacitors

Yin

Luo

et al. 2020

Energies

View full text Add to dashboard Cite

show abstract

“…Nabae, Takahashi, and Akagi in 1981sucessfully proposed the neutral point converter [20] for many applications.Three phase transformerless grid connected topologies [21] are three phase full bridge (3-FB) [22], H7 [23], 5 level multiple pole multilevel diode clamped converter (5L M 2 DCC) [24].Among all three phase NPC-MLI have attracted due to its high efficiency with low leakage current and THD. The output phase voltage has more than two levels that reduce the harmonic content.Further, it has compact structure that is clear to implement digital signal.…”

Section: Significance Of Neutral Point Clamped-mli Topologymentioning

confidence: 99%

Modeling and control strategy of three phase neutral point clamped multilevel PV inverter connected to the grid

Arulkumar

Vijayakumar

Palanisamy

2015

Journal of Building Engineering

View full text Add to dashboard Cite

“…Recently, transformerless operation, i.e. eliminating the low frequency power transformer from the grid-tied PV inverter, is followed in order to improve the PCS efficiency and reduce its cost and volume [1]- [5]. Even though the gained merits from the transformerless operation, it results in several problems, where the dc current component injection into the grid is a major one.…”

Section: Introductionmentioning

confidence: 99%

“…Even though the gained merits from the transformerless operation, it results in several problems, where the dc current component injection into the grid is a major one. This dc current component might exist due to one or more of the following reasons [5]:…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Coupled-Inductor-Based DC Current Measurement Technique for Transformerless Grid-Tied Inverters

Abdelhakim

Mattavelli

Yang

et al. 2018

IEEE Trans. Power Electron.

View full text Add to dashboard Cite

Grid-tied photovoltaic (PV) inverters must fulfill several requirements, including high efficiency and reduced cost and complexity of the overall system. Hence, transformerless operation is advantageous in order to achieve the prior requirements. Meanwhile, such operation results in several demerits, like the dc current component injection into the grid. This component should be effectively mitigated in order to avoid some impacts, like the saturation of the transformers in the distribution network. On the other hand, limiting this component up to few milliamperes is seen to be a challenging issue due to the various measurement errors.Accordingly, different blocking and measurement techniques have been proposed and studied to overcome this issue, where some demerits are seen behind each technique like the implementation complexity, the common mode voltage problems, and the high filter requirements. Moreover, none of them measures the dc component directly, but predicts its value using different approaches.Hence, this letter proposes a new technique to measure this dc current component with high accuracy using a coupled-inductor combined with a small range hall effect current sensor in order to achieve the lowest possible cost with the highest possible accuracy. The proposed technique is introduced, analyzed, and tested experimentally to verify its principle of operation. Also experimental measurement of the dc current component using a 5 kVA transformerless grid-tied voltage source inverter (VSI) is introduced with and without the proposed technique in order to validate its operation.

show abstract

Minimization of the DC Component in Transformerless Three-Phase Grid-Connected Photovoltaic Inverters

Cited by 42 publications

References 35 publications

An Improved Sensorless Vector Control Method for IPMSM Drive with Small DC-Link Capacitors

An Improved Sensorless Vector Control Method for IPMSM Drive with Small DC-Link Capacitors

Modeling and control strategy of three phase neutral point clamped multilevel PV inverter connected to the grid

Coupled-Inductor-Based DC Current Measurement Technique for Transformerless Grid-Tied Inverters

Contact Info

Product

Resources

About