A Novel Control Strategy for Grid-Connected Inverter Based on Iterative Calculation of Structural Parameters

Sun, Zengqi; Wang, Dazhi; Yuan, Tianqing; Liu, Zairan; Yu, Jiahui

doi:10.3390/en11123306

Cited by 5 publications

(6 citation statements)

References 24 publications

(17 reference statements)

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“…Since the addition of the LTD link will cause the system to appear in a high-frequency oscillation after entering a steady state, LADRC is composed of LESO and LSEF. According to Formulas (14), (16), (17) and (19), the block diagram of the first-order LADRC can be obtained, as shown in Figure 5.…”

Section: Traditional Ladrc Control Structurementioning

confidence: 99%

“…The good control effect of the photovoltaic system can ensure the smooth completion of the grid connection. Therefore, this issue has aroused widespread concern in scholars at home and abroad [16][17][18][19]. The most traditional control method of the photovoltaic grid-connected inverter is double closed-loop proportional integral (PI) control.…”

Section: Introductionmentioning

confidence: 99%

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Linear Active Disturbance Rejection Control of Grid-Connected Photovoltaic Inverter Based on Deviation Control Principle

Zhou

Wang

2020

Energies

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Photovoltaic grid-connected power generation systems are easily affected by external factors, and their anti-interference performance is poor. For example, changes in illumination and fluctuations in the power grid affect the operation ability of the system. Linear active disturbance rejection control (LADRC) can extract the “summation disturbance” information from the system and eliminate the disturbance at the fastest speed by controlling the signal before it affects the final output of the system. In this paper, an improved linear ADRC based on the principle of deviation control is proposed, and the voltage outer loop is controlled by an improved LADRC. This improved LADRC takes the deviation between each state variable and its observed value as the regulation basis for each state variable of the linear extended state observer (LESO). Based on the analysis of the bode diagram in the frequency domain, it can be concluded that, compared with the unimproved LADRC, the new LADRC has better disturbance rejection performance. The simulation results show that the control performance of the new, improved LADRC is better than that of the unimproved LADRC under different operating conditions, and it has better stability performance and anti-disturbance performance.

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Section: Traditional Ladrc Control Structurementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Linear Active Disturbance Rejection Control of Grid-Connected Photovoltaic Inverter Based on Deviation Control Principle

Zhou

Wang

2020

Energies

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“…At the same time, the inequality |1 + G rc (z) P 0 (z) | = 0 should also be ensured. Therefore, substitution of Equation (15) into this inequality leads to:…”

Section: Pmqr-type Rc Scheme Designmentioning

confidence: 99%

“…The PI control scheme is commonly used in the stationary reference frame (SRF) for its simple control structure, ease of implementation, and good transient response [14]. However, a PI controller is unable to track a sinusoidal reference with zero steady-state error because of the limited control-loop gain [15]. It also lacks sufficient suppression ability for low frequency harmonics.…”

Section: Introductionmentioning

confidence: 99%

Analysis and Design of A PMQR-Type Repetitive Control Scheme for Grid-Connected H6 Inverters

Yang

Liu

et al. 2019

Applied Sciences

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There exist several challenges in the implementation of proportional multiple quasi-resonant (PMQR) control strategies in single-phase grid-connected H6 inverters, such as high computational costs and design complexity. To overcome these challenges, this paper proposes a proportional multiple quasi-resonant (PMQR)-type repetitive control (PMQR-type RC) scheme for single-phase grid-connected H6 inverters. In the control scheme, a repetitive controller and a proportional controller run in parallel. The repetitive controller is to improve the steady-state harmonics compensation ability, while the proportional controller can enhance the transient performance of the system. Both theoretical stability analysis and detailed design steps regarding the proposed control scheme are introduced. Finally, comparison results on a typical single-phase grid-connected H6 inverter with LC filter under a variety of control methods verify the capability of suppressing harmonics and the robust performance of the proposed control strategy against grid disturbances.

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“…In the dual closed-loop control system of power grid voltage orientation, the bus capacitor voltage controlled by the voltage outer loop is kept at a preset constant value, and the output of the voltage outer loop is used as the reference value of the current inner loop. The current inner loop adjusts the reference value of reactive power according to the requirements of the entire wind power for reactive power, thereby improving the control effect of voltage outer loop [13]. In the typical double-loop control, there is current coupling in inner loop.…”

Section: Introductionmentioning

confidence: 99%

Dual Closed-Loop Linear Active Disturbance Rejection Control of Grid-Side Converter of Permanent Magnet Direct-Drive Wind Turbine

Xia

Zhou

et al. 2020

Energies

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In the permanent magnet direct-drive wind power grid-connected system, in order to solve the coupling problem between d -axis and q -axis currents and to improve the disturbance rejection performance of direct current (DC) bus voltage under grid faults, a new dual closed-loop structure based on linear active disturbance rejection control (LADRC) is proposed. This new dual closed-loop control includes current inner loop decoupling control and DC bus voltage outer loop control with first-order LADRC. As the LADRC has the advantages of decoupling and disturbances rejection, it is applied to the control of wind power grid-connected inverter. Through analysis, it is demonstrated that the current decoupling control is simpler than proportional integral (PI) control algorithm, the dynamic response speed is faster, and the DC bus voltage control has better anti-disturbance. Finally, a 1.5 MW direct-drive permanent magnet wind power system was established through digital simulation, and the control effects of the two control modes under different working conditions are compared. The simulation results verify that the proposed dual closed-loop control based on first-order LADRC is superior to PI double closed-loop control in terms of decoupling performance and disturbance rejection performance under grid faults.

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A Novel Control Strategy for Grid-Connected Inverter Based on Iterative Calculation of Structural Parameters

Cited by 5 publications

References 24 publications

Linear Active Disturbance Rejection Control of Grid-Connected Photovoltaic Inverter Based on Deviation Control Principle

Linear Active Disturbance Rejection Control of Grid-Connected Photovoltaic Inverter Based on Deviation Control Principle

Analysis and Design of A PMQR-Type Repetitive Control Scheme for Grid-Connected H6 Inverters

Dual Closed-Loop Linear Active Disturbance Rejection Control of Grid-Side Converter of Permanent Magnet Direct-Drive Wind Turbine

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