Improvement of the current control loop of the single-phase multifunctional grid-tied inverter of photovoltaic system

Shavelkin, A.A.; Jasim, Jasim Mohmed Jasim; Shvedchykova, Iryna

doi:10.15587/1729-4061.2019.185391

Cited by 4 publications

(5 citation statements)

References 15 publications

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“…1, 2. The model is built according to known principles using a unit to calculate the loss of power in the keys [23] by the instantaneous current and voltage values in accordance with the parameters of the transistors. The model parameters are: U g =220 V, network resistance Х g =0.04 Ohm, the inverter output filter R f =0.3 Ohm, C f =60 μF, reactor's L=0.00105 H and R=0.1 Ohm.…”

Section: Matlab Simulation Resultsmentioning

confidence: 99%

“…It includes an internal circuit of current control (CCL) of the inverter and three proportional-integral (PI) voltage controllers VC, VC2, VC3 to stabilize the voltage at the inverter input U d at the predefined level 1 d U [22,23]. CCL can be implemented using a relay current controller [22,23], or width-pulse modulation (PWM). Below we consider an option with PWM.…”

Section: The Structure Of a Photovoltaic System Control Systemmentioning

confidence: 99%

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Improved control of energy consumption by a photovoltaic system equipped with a storage device to meet the needs of a local facility

Shavolkin

Shvedchykova

Jasim

2021

EEJET

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+This paper has considered improving the management of energy consumption by a photovoltaic system with a storage device for a local object connected to the network. The aim of the study is to reduce expenditures when paying for electricity consumed from the network, when loading an object, independent of the time of year, and to eliminate energy generation to the grid. An energy generation control algorithm has been improved whereby the state of battery charge during the day is based on a forecast. That could reduce electricity consumption at night with better utilization of rechargeable battery and photovoltaic battery power during the day. It is proposed to use autonomous operation by disconnecting from the network during peak tariff hours and during the day with enough energy generation by a photovoltaic battery. This would ensure the normal functioning of an object in the event of a possible deterioration in the quality of voltage in the network while reducing the loss of energy in the inverter. Predictive control of the expected battery charge at the next checkpoint (at 0.5 hours or less between control points) has been proposed. A control system structure has been developed whereby a rechargeable battery current is set depending on an operational mode, the tariff zone, and the projected generation by a photovoltaic battery while reducing the modulation frequency under an autonomous mode. In this case, the modes are switched and the structure is changed taking into consideration the state of battery charge. Simulation in the daily cycle has shown the possibility of reducing the cost of electricity consumed from the network by 1.7‒8 times at two or three tariff rates. Simulation of electromagnetic processes in the system confirms acceptable regulation indicators when switching the structure, as well as a decrease in the energy loss in an inverter under an autonomous mode by up to 40 %

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Section: Matlab Simulation Resultsmentioning

confidence: 99%

Section: The Structure Of a Photovoltaic System Control Systemmentioning

confidence: 99%

Improved control of energy consumption by a photovoltaic system equipped with a storage device to meet the needs of a local facility

Shavolkin

Shvedchykova

Jasim

2021

EEJET

Self Cite

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“…With a power consumption of LO in excess of 10 kW, it is advisable to use three-phase multifunctional inverters while maintaining a power factor close to 1 at the point of common coupling (PCC) to the grid [5][6][7][8][9][10][11][12]. This allows to unload the grid from reactive power and ensures the symmetry of loading the phases of the grid at an unbalanced load [9][10][11][12].…”

Section: Literature Review and Problem Statementmentioning

confidence: 99%

Use of Hybrid Photovoltaic Systems with a Storage Battery for the Remote Objects of Railway Transport Infrastructure

et al. 2022

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The use of a grid-tied photovoltaic system with a storage battery to increase the power of objects of railway transport infrastructure above the limit on consumption from the grid with the possibility of energy saving is considered. The methods of analysis of energy processes in photovoltaic systems with a storage battery are used. They are added via the processing of archival data of power generation of a photovoltaic battery and computer modeling results. A technique of system parameter calculation to increase the power according to the given load schedule of the object at constant and maximum possible degree of power increasing is developed. The values of the average monthly generation of a photovoltaic battery at the location point of the object based on archival data are used. The principle of the control of power, consumed from the grid, according to the given values of the added and total load is developed. Using the basic schedule of added load power in connection with the graph of photovoltaic battery generation allows reducing the installed power of the storage battery. The additional reduction in the installed power of the photovoltaic and storage batteries is possible at the corresponding choice of the degree of power load increasing. The joint formation of current schedules with reference to the added power value and state of charge of the battery according to the short-term forecast of the generation of a photovoltaic battery is proposed. The value of added power at certain intervals of time is set according to the graph of actual generation of the photovoltaic battery, which contributes to the maximum use of its energy. With the average monthly generation of a photovoltaic battery in the spring–autumn period, the discharge of the battery during the hours of the morning load peak is not used. This reduces the number of deep discharge cycles and extends the battery life. The description of energy processes in steady-state conditions for the daily cycle of system functioning is formalized. On this basis, a mathematical model is developed in MATLAB with an estimation of the costs of electricity consumed from the grid. When modeling, archival data are used for days when the generation of a photovoltaic battery over time intervals is close to average monthly values. This makes it possible to evaluate the effectiveness of system management under conditions close to real during the year.

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“…Great attention has been paid to the increase in the quality of electrical energy when a multifunctional grid inverter is used. The technical solution of a single-phase inverter was presented in [8]. An improvement of the inverter characteristics, with fuzzy logic used, was then described in [9].…”

Section: Literature Review and Problem Statementmentioning

confidence: 99%

“…The purpose of the restriction is to reduce the number of deep discharge cycles of SB. Here, ∆Q* 24 is determined by (8).…”

Section: Implementation Variant For One-tariff Planmentioning

confidence: 99%

Improvement of the Grid-Tied Solar-Wind System with a Storage Battery for the Self-Consumption of a Local Object

et al. 2022

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This work aimed to improve how the equipment of a grid-tied solar-wind system used the installed power of the storage battery while reducing the cost of electricity consumed by a local object from the grid. A method for calculating the parameters for a given load schedule is proposed, along with the value of the reduction in electricity consumption. Values for the power generation of a wind generator and photovoltaic battery are based on archival data. The possible power ratio of the wind generator and the photovoltaic battery is 1:8.33. The formation of the state of charge of the battery involves: a calculation of its value for the morning peak according to the forecast for the next day; adjustable discharge in the evening with full or partial compensation for the load consumption according to the forecast for the next day; a night charge with a given current value. At a one-tariff plan, one battery discharge cycle per day is used. A night charge from the grid is not used. With a two-tariff plan and the use of a night battery charge from the grid, one discharge cycle is used in the spring-summer-autumn period. The simulation confirms the possibility of reducing electricity costs by 2.9 times in winter, which corresponds to the set value, alongside a complete elimination of costs in summer.

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Improvement of the current control loop of the single-phase multifunctional grid-tied inverter of photovoltaic system

Cited by 4 publications

References 15 publications

Improved control of energy consumption by a photovoltaic system equipped with a storage device to meet the needs of a local facility

Improved control of energy consumption by a photovoltaic system equipped with a storage device to meet the needs of a local facility

Use of Hybrid Photovoltaic Systems with a Storage Battery for the Remote Objects of Railway Transport Infrastructure

Improvement of the Grid-Tied Solar-Wind System with a Storage Battery for the Self-Consumption of a Local Object

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