A Control Strategy for Parallel Operation of Single-Phase Voltage Source Inverters: Analysis, Design and Experimental Results

Abstract-Dispersed distribution of many inverter-based Electric springs (ESs) over the power grid as a means to provide stability support for smart grid against high penetration of intermittent renewable power has been suggested recently. While single ES has its own local controller, their wide dispersion makes it difficult to coordinate their functions. In this paper, a novel distributed control method for adjusting the whole voltage level of ESs installed in the network is developed. Firstly, the specific control scheme for the single ES is designed to ensure good transient response and zero steady-state error. Combining with the consensus algorithm for ES reference voltage updating, the control strategy for multiple ESs is implemented, in which the inductor current is considered as the feedback variable to modify the output of the voltage controller. Compared with the conventional droop control, the scheme can maintain the voltage level of the critical load without sacrificing the voltage control accuracy. In addition, this algorithm guarantees system stability and optimal convergence speed. Simulation results show that the distributed voltage control can guarantee the overall coordination of parallel ESs under various operation conditions.

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“…(10) and Equ. (11) often impacts the power sharing accuracy brought by its dependency on the line impedances [18].…”

Section: Controller For Multiple Essmentioning

confidence: 99%

Distributed Control of Multiple Electric Springs for Voltage Control in Microgrid

Chen

Hou

Hui

2017

IEEE Trans. Smart Grid

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“…Uninterruptible power supplies (UPSs) are employed to protect critical loads from a short or long interruption [1][2][3][4][5]. One of the main control purposes of a UPS is precisely regulating the output voltage, keeping it as sinusoidal as possible with a low total harmonic distortion (THD).…”

Section: Introductionmentioning

confidence: 99%

A Single-Loop Repetitive Voltage Controller with an Active Damping Control Technique

et al. 2017

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This paper proposes a single-loop repetitive voltage control strategy which incorporates the active damping control feature for single-phase uninterruptible power supply (UPS) applications. The proposed method reduces the effect of the LC resonant peak, which limits the control bandwidth and deteriorates the stability of the entire control loop by effectively increasing the damping component. Due to the increased stability margin, a repetitive controller working together with a proportional-resonant (PR) controller can be easily adopted. Moreover, the voltage error is minimized even under severe non-linear load conditions. It is confirmed that the proposed single-loop controller achieves excellent and stable voltage regulation performance by evaluating the entire loop-gain of the system and the output impedance. Both the simulation and the experimental results for a 1.5 kW UPS inverter show agree well with the analyses, and the excellence of the proposed method has been verified.

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“…carrier-based PWM [10] or space-vector (SVM) modulation), control of the circulating current is achieved through adjustments in the conduction times of each converter, usually through PI controllers or exact reference generation [2], [3]. A method that calculates the power reference for each of the parallel converter legs with isolated supplies without input from the other legs, applied to uninterruptible power supplies (UPS) was proposed in [5] while a discontinuous modulation scheme that allows the use of a single-core, threelimb inductor was presented in [6].…”

Section: Introductionmentioning

confidence: 99%

Reducing circulating currents in interleaved converter legs under selective harmonic elimination pulse-width modulation

Konstantinou

Pou

Capella

et al. 2015

2015 IEEE International Conference on Industrial Technology (ICIT)

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Abstract-Interleaving of voltage source converter legs enables higher output currents per phase, effectively increasing the power rating without increasing semiconductor ratings. Different switching patterns between the converter legs increase the number of Thevenin output voltage levels and, hence, the quality of the waveform but also generate circulating currents within one phase. This paper proposes a controller for interleaved converter legs under selective harmonic elimination pulse-width modulation (SHE-PWM) aimed at reducing the circulating current within the legs of each phase. The controller is used in combination with optimally selected SHE-PWM patterns to minimise the peak value of the circulating current. The proposed controller is applied in two interleaved three-level active neutral-pointclamped converters and simulation results demonstrate their performance.

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A Control Strategy for Parallel Operation of Single-Phase Voltage Source Inverters: Analysis, Design and Experimental Results

Cited by 119 publications

References 28 publications

Distributed Control of Multiple Electric Springs for Voltage Control in Microgrid

Distributed Control of Multiple Electric Springs for Voltage Control in Microgrid

A Single-Loop Repetitive Voltage Controller with an Active Damping Control Technique

Reducing circulating currents in interleaved converter legs under selective harmonic elimination pulse-width modulation

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