A Novel Power-Voltage Control Strategy for the Grid-Tied Inverter to Raise the Rated Power Injection Level in a Weak Grid

Sang, Shun; Gao, Ning; Cai, Xu; Li, Rui

doi:10.1109/jestpe.2017.2715721

Cited by 62 publications

(34 citation statements)

References 34 publications

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“…Transforming (16) to the converter dq reference frame (see Appendix B), and rearranging yields (17). Finally, (18) shows the linearised small signal state-space form of (17) [36,37] (see Appendix A):…”

Section: Current Control Loopmentioning

confidence: 99%

“…The authors proposed an impedance-phase compensation control scheme by increasing the phase margin of the grid-connected inverter. A similar approach was proposed in [17], where a novel power-voltage control strategy was proposed based on voltage feedback control of the voltage across the capacitor of the LCL output filter of the inverter. Reference [17] concluded that the stability of a grid-tied inverter remains unchanged with increasing PLL bandwidth.…”

Section: Introductionmentioning

confidence: 99%

“…A similar approach was proposed in [17], where a novel power-voltage control strategy was proposed based on voltage feedback control of the voltage across the capacitor of the LCL output filter of the inverter. Reference [17] concluded that the stability of a grid-tied inverter remains unchanged with increasing PLL bandwidth. Finally, in [18][19][20][21] feedforward control methods were proposed to reduce the impact of the PLL bandwidth on the stability of the system.…”

Section: Introductionmentioning

confidence: 99%

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Small-Signal Modelling and Stability Assessment of Phase-Locked Loops in Weak Grids

et al. 2019

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This paper proposes a low-complexity small signal model for a 3-leg converter connected to a balanced three-phase, three-wire weak grid and synchronised to this grid using a PLL implemented in a synchronous rotating d-q axis. A thorough analysis of the system stability as a function of the PLL bandwidth and the short circuit ratio (SCR) of the grid is performed based on a linearised model. By using the proposed model, an improved design process is proposed for the commonly used dq-PLL that accounts for the potential stability issues which may occur in weak grids. Using the proposed approach, it is possible to optimise the PLL design to find the fastest PLL that can operate stably considering the SCR of the grid. In addition, the proposed model is very simple, resulting in a straightforward design tool that could also be used for online stability monitoring. The method is validated through simulations and experimental results from a 5kW laboratory system.

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Section: Current Control Loopmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Small-Signal Modelling and Stability Assessment of Phase-Locked Loops in Weak Grids

et al. 2019

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“…Moreover, the dynamics of VSI is changed into a linear time-invariant (LTI) system in the synchronous rotating reference frame. By means of this, the VSI system can be easily designed and analyzed by using the linear control techniques [12]- [18]. For the standard VCC, since the d-q axes currents have to be in phase with the grid voltage, the phase angle used by the Park transformation has to be extracted from the grid voltages correctly [1].…”

Section: Introductionmentioning

confidence: 99%

Vector Current Control Derived from Direct Power Control for Grid-Connected Inverters

Gui

Wang

Blaabjerg

2019

IEEE Trans. Power Electron.

104

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We propose a vector current control derived from direct power control (VCC-DPC) for a three-phase voltage source inverter (VSI) in the synchronous rotating frame through instantaneous real and reactive powers. The proposed VCC-DPC method has the same control structure as the conventional VCC except for the coordinate transformation, since we obtain the d-q axes currents model of VSI without using Park transformation and the PLL system. Consequently, the proposed method has the same property as the conventional VCC if the PLL extracts the phase angle of the grid voltage correctly. However, with the consideration of the slow dynamics of the PLL, the proposed method has an enhanced dynamical performance feature compared with the conventional VCC. Moreover, it has another benefit that the reduction of the computational burden could be expected since there is no Park transformation and the PLL in the controller implementation. We can guarantee that the closed-loop system with the proposed method is exponentially stable in the operating range. Finally, both simulation and experimental results using a 15-kW-inverter system match the theoretical expectations closely. Index Terms-Voltage source inverter, vector current controller, instantaneous real and reactive powers, exponentially stable.

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“…Thus, the converters can conduct active power filtering (APF) for the loads [7][8][9], and conduct power balancing for diesel generator outputs [10,11]. When ac grid fails, the converters can act as uninterruptible power systems (UPS) to supply both dc and ac loads [12,13]. In summary, the multifunction converters can fulfill real-and reactive-power injection, rectification, active power filtering, threephase power balancing and UPS functions.…”

Section: Introductionmentioning

confidence: 99%

Multi-Function High-Power Converters for Smart-Grid Applications

Huang

Lin

2018

E3S Web Conf.

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High penetration of green energy has driven conventional utility grids into smart grids to accommodate dc appliances and various types of dc equipment, increasing effectiveness, efficiency, and resilience. In a smart grid, ac is harmonized with dc, and therefore, a multi-function converter is required to transfer power between ac and dc grids. This paper presents system configuration, operational principle and control of multi-function high-power converters for smart-grid applications. Simulated and experimental results from a 350 kVA converter are used to verify the feasibility of the proposed system configuration and control.

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A Novel Power-Voltage Control Strategy for the Grid-Tied Inverter to Raise the Rated Power Injection Level in a Weak Grid

Cited by 62 publications

References 34 publications

Small-Signal Modelling and Stability Assessment of Phase-Locked Loops in Weak Grids

Small-Signal Modelling and Stability Assessment of Phase-Locked Loops in Weak Grids

Vector Current Control Derived from Direct Power Control for Grid-Connected Inverters

Multi-Function High-Power Converters for Smart-Grid Applications

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