Simple digital current control strategy for single‐phase grid‐connected converters

Sanatkar-Chayjani, Majid; Monfared, Mohammad

doi:10.1049/iet-pel.2014.0091

Cited by 10 publications

(11 citation statements)

References 24 publications

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“…In the discrete-time domain, the time delay in a digital control system can be under precise consideration. When the delay time is 1.5T S (T S for control delay and 0.5T S for the PWM module delay), the discrete-time complex vector transfer function of the plant with G d (s) is obtained as [14,17]…”

Section: Discrete-time Modelmentioning

confidence: 99%

Enhanced dq current control for single‐phase voltage‐source inverters

Huang

Chen

et al. 2018

IET Power Electronics

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Designing the dq-frame current regulator for single-phase voltage-source inverters is a very challenging task. Since only one real current signal exists in the circuit, an orthogonal signal generation (OSG) block is required to generate the virtual orthogonal signal. Thus, ac variables can be turned into equivalent dc quantities through an αβ/dq transformation. However, the OSG block makes the control system complex and introduces an extra transient disturbance. Consequently, the dynamic performance is deteriorated. In this study, the reference-current-based OSG method is analysed thoroughly. Based on this structure, the dq-axes decoupling control, which is widely discussed for three-phase systems and usually neglected for singlephase systems, is studied. Two decoupling techniques, i.e. the reference-current feed-forward control and the quasi-complex vector proportional-integrator control, are implemented and analysed. The proposed theories and control schemes are evaluated by experimental results.

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Section: Discrete-time Modelmentioning

confidence: 99%

Enhanced dq current control for single‐phase voltage‐source inverters

Huang

Chen

et al. 2018

IET Power Electronics

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“…The VSC should be properly designed and controlled to achieve a high power quality on the grid cost-effectively. Given the power quality of the grid, VSCs are conventionally assumed to ensure flow of sinusoidal current at fundamental frequency [1][2][3][4][5][6][7][8][9] even if the grid voltage is distorted by harmonics. This method injects the least harmonic current without deteriorating grid harmonic pollution.…”

Section: Introductionmentioning

confidence: 99%

“…The conventional controllers for the VSC are investigated in terms of cost and effectiveness to implement the novel UPFR mode cost-effectively. The VSC is usually tied to the grid through an inductor [1][2][3][4][5][6][7][8][9], which current-to-voltage conversion (CVC) is proceeded by the controller for the purpose of voltage-oriented control (VOC). The conventional single-phase VSC controller has to generate two orthogonal sinusoidal component artificially [10], with amplitude proportional to the fundamental frequency grid voltage.…”

Section: Introductionmentioning

confidence: 99%

“…Finally, the proposed grid-tie control scheme can be reasonably anticipated to reduce computation time if implemented digitally. Compared with digital control algorithms, such as sliding mode, deadbeat, repetitive, and predictive, which suffer from the expense of complicated design and implementation and higher computation burden while requiring good knowledge of system parameters [7][8][9], the proposed scheme is simpler, easier to design, and implemented with less computation burden and knowledge requirement. Fig.…”

Section: Introductionmentioning

confidence: 99%

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Simple four‐quadrant grid‐tie control scheme with unity power factor rectifier mode for single‐phase DC/AC converters

Chi

Purnama

Hsieh

et al. 2017

IET Renewable Power Generation

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This study proposes a voltage-oriented control scheme for four-quadrant grid-tie of a single-phase bidirectional direct current/alternating current (AC) voltage-sourced converter (VSC) to operate smartly at modes of unity power factor (PF) rectifier (UPFR), inverter or static var compensator. Given the possible harmonic-distorted AC grid voltage, the proposed scheme follows or filters the grid voltage to generate the appropriate current command template for minimising the harmonic current while synchronising with the grid. The following template is for the UPFR mode, whereas the filtered template is for the other modes. The scheme proposes a unique band-pass filter (BPF) to proceed with direct component generation for the filtered template. The proposed scheme further unifies the grid-tie inductor current-to-voltage conversion for the following emplate and the quadrature component generation for the filtered template into a differentiator. The control laws under the filtered and following templates are derived. The BPF and differentiator designs are introduced. Simulations and experiments are conducted with a one-cycle control full-bridge VSC to verify the proposed grid-tie control scheme and evaluate its performance. Nomenclature v grid AC grid voltage source R grid , L grid AC grid wire resistance, inductance v R grid , v L grid voltages across R grid , L grid i grid , i sgrid , i dgrid AC grid current, its assumed sinusoid, their difference i R , i sR , i dR rectifier mode input current, its assumed sinusoid, their difference i NL , i 1NL , i hNL non-linear load current, its fundamental, harmonic components g emulated conductance of UPFR mode v AC , V AC AC grid voltage vector on point of common coupling, its RMS value v out VSC AC output voltage vector v filter , v R f , v L f voltage across grid-tie filter, resistance, inducatnce of the filter k VSC AC voltage gain v 1 , V^1, V 1 VSC fundamental output voltage vector, its amplitude, RMS value θ 1 phase angle of v 1 * * , I 1 * * AC output voltage command for arm A, B of FB VSC v oA , v oB AC output voltage on arm A, B of FB VSC V oA , V oB average values of v oA , v oB f s , T s , d switching frequency, period, duty cycle over T s V DC DC grid voltage f c , ω c central frequency of the pass band of the BPF, its angular form f cL , ω cL corner frequency of the pass band of the low-pass filter, its angular form f cH , ω cH corner frequency of the pass band of the highpass filter, its angular form ζ L , ζ H damping ratio of low-pass, high-pass filters K L , K H gain in the pass band of low-pass, high-pass filters

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“…Among the limitations of the SRF techniques are the need for several reference frame transformations, which increases the memory requirements and calculation errors, the limited application to balanced systems, complexity of algorithm and etc. [13][14][15][16][17][18][19][20]. Repetitive control which is based on the internal model principle is a very useful method that can track or reject periodic signals.…”

Section: Introductionmentioning

confidence: 99%

Application of the harmonic control arrays technique to single‐phase stand‐alone inverters

Karbasforooshan

Monfared

Dogruel

2016

IET Power Electronics

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This study proposes the adaption of the harmonic control array (HCA) technique to control a single-phase standalone inverter system. The HCA method is recently proposed as an efficient scheme to control the systems with periodic references or disturbances. The HCA appropriately adjusts the harmonic components of the control signal to obtain a zero steady-state error. Since the signals and parameters involved in this method are complex valued, a discrete time implementation is presented for applying the method through a digital platform. The design procedure of the controller parameters are also presented by details. To confirm the theoretical achievements, experimental results for the prototype system are presented in this study. The results demonstrate the effectiveness of the proposed control scheme. Inverter modelThe power and control circuits of a single-phase voltage-source stand-alone inverter are shown in Fig. 1. According to this figure, the power circuit consists of a full-bridge inverter, a LC-type IET Power ElectronicsResearch Article

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Simple digital current control strategy for single‐phase grid‐connected converters

Cited by 10 publications

References 24 publications

Enhanced dq current control for single‐phase voltage‐source inverters

Enhanced dq current control for single‐phase voltage‐source inverters

Simple four‐quadrant grid‐tie control scheme with unity power factor rectifier mode for single‐phase DC/AC converters

Application of the harmonic control arrays technique to single‐phase stand‐alone inverters

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