Intelligent voltage control strategy for three-phase UPS inverters with output <i>LC</i> filter

Jung, Jin‐Woo; Leu, Viet Quoc; Dang, Dong Quang; Duc, Ton; Mwasilu, Francis; Choi, Hong Dae

doi:10.1080/00207217.2014.966781

Cited by 11 publications

(5 citation statements)

References 21 publications

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“…The authors used fuzzy models to obtain quantitative estimates of environmental initiation projects in air transportation [18]. The authors implement supervised fuzzy neural network control (SFNNC) to control the three-phase inverter of a UPS [19]. Zheng et al used FNN to solve control problems for complex robotic systems with uncertainty and disturbances [20].…”

Section: And Online Interactivementioning

confidence: 99%

A Novel Control Strategy for Uninterruptible Power Supply Based on Backstepping and Fuzzy Neural Network

Yang

Zhang

et al. 2023

IEEE Access

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This paper proposes a novel control strategy for controlling the uninterruptible power supply (UPS) inverter, which is based on backstepping control theory combined with a fuzzy neural network (FNN). The advantage of backstepping control is that it can decompose a complex system into multiple subsystems, stabilize the control object according to Lyapunov stability theory, and simplify the controller design. However, it requires prior knowledge of multiple system parameters. FNN can approximate arbitrary nonlinear functions and system errors, which can reduce the parameters required for controller design. Hence, Combining the advantages of both methods, a UPS inverter control method with only a few parameters is designed. Then the sliding mode gain is added to compensate for the fuzzy neural network to reduce the chattering when the system operates and ensure the needed power quality. To verify the effectiveness of the proposed control system, the effectiveness of the proposed method is verified by a simulation experiment platform.INDEX TERMS Power quality, fuzzy neural network (FNN), backstepping control, uninterruptible power supply (UPS).

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Section: And Online Interactivementioning

confidence: 99%

A Novel Control Strategy for Uninterruptible Power Supply Based on Backstepping and Fuzzy Neural Network

Yang

Zhang

et al. 2023

IEEE Access

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“…Nevertheless, this complex technique is suitable for VSCs operating with lowswitching frequencies where the possible resonances with the power system must be damped. Other sophisticated control techniques such as predictive control [19] or neural networks [20] have been reported. Despite the good performance of these proposals, it has to be considered that the controller tuning relies on some auxiliary processes, i.e., the selection of adequate weighting factors of the cost function for the predictive controllers or training stages in the case of neural networks.…”

Section: Introductionmentioning

confidence: 99%

Virtual Conductance Based Cascade Voltage Controller for VSCs in Islanded Operation Mode

Matas-Díaz

Barragán-Villarejo²,

Olives-Camps³

et al. 2022

Journal of Modern Power Systems and Clean Energy

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Voltage source converters have become the main enabler for the integration of distributed energy resources in microgrids. In the case of islanded operation, these devices normally set the amplitude and frequency of the network voltage by means of a cascade controller composed of an outer voltage control loop and an inner current control loop. Several strategies to compute the gains of both control loops have been proposed in the literature in order to obtain a fast and decoupled response of the voltages at the point of common coupling. This paper proposes an alternative and simple methodology based on the introduction of a virtual conductance in the classic cascade control. This strategy allows to design each control loop independently, obtaining a closed-loop response of a first-order system. In this way, the gains of each control loop are easily derived from the parameters of the LC coupling filter and the desired closed-loop time constants. Furthermore, a state observer is included in the controller to estimate the inductor current of the LC filter in order to reduce the number of required measurements. A laboratory testbed is used to validate and compare the proposed controller. The experimental results demonstrate the effectiveness of the proposal both in steady-state and transient regimes.

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“…However, the design of the droop coefficient at each harmonic frequency is more complex and the computational burden of this method is heavy. In [12], a fuzzy neural network based control method is proposed for the standalone inverter. Nevertheless, the learning rate parameters in this method are difficult to tune.…”

Section: Introductionmentioning

confidence: 99%

Control Strategy Based on $\text{H}\infty$ Repetitive Controller With Active Damping for Islanded Microgrid

Ouyang

Zhang

et al. 2019

IEEE Access

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To overcome the drawbacks of the proportional plus integral (PI) control based strategy, i.e., limitation for harmonic suppression and performance deterioration under load variation, a voltage control strategy based on the H∞ repetitive controller with inverter-side current feedback damping is proposed for the inverter in islanded microgrid. The H∞ repetitive controller provides good robustness against parameter perturbation and ensures the output voltage of low total harmonic distortion. Compared with other damping methods, a good resonance suppression and a better attenuation of the high-order harmonics can be achieved under the proposed strategy, which further improves the control performance of the voltage repetitive control system. A state space model including the damping coefficient is built to implement order reduction of the high-order controller, thereby simplifying the digital implementation while nearly without performance degradation. Moreover, the frequency response analysis shows that the order reduction can improve the adaptability of the controller to parameter variation. Finally, experiments and simulations verify the correctness of the analysis. INDEX TERMS H∞ repetitive controller, microgrid, total harmonic distortion (THD), inverter, active damping.

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Intelligent voltage control strategy for three-phase UPS inverters with output LC filter

Cited by 11 publications

References 21 publications

A Novel Control Strategy for Uninterruptible Power Supply Based on Backstepping and Fuzzy Neural Network

A Novel Control Strategy for Uninterruptible Power Supply Based on Backstepping and Fuzzy Neural Network

Virtual Conductance Based Cascade Voltage Controller for VSCs in Islanded Operation Mode

Control Strategy Based on $\text{H}\infty$ Repetitive Controller With Active Damping for Islanded Microgrid

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