Power Quality Enhancement Using Linear Quadratic Regulator Based Current-controlled Voltage Source Inverter for the Grid Integrated Renewable Energy System

Rajakumar, Vinifa; Kavitha, A.; Arunodayaraj, Immanuel Selwynraj

doi:10.1080/15325008.2017.1378773

Cited by 13 publications

(5 citation statements)

References 30 publications

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“…. , 7 are positive and satisfy (6). Applying Schur compliment (Lemma 1), we can show that Φ < 0 is equivalent to χ < 0 as in (7).…”

Section: Resultsmentioning

confidence: 92%

“…Many practical systems, such as chemical processes [1], population models [2], atmospheric flow [3,4], spacecraft systems [5], and hydraulic and electric systems [6] are examples of real applications in sciences and engineering fields that commonly possess time delay. It is well known that perfect mathematical models for the practical systems are difficult to form.…”

Section: Introductionmentioning

confidence: 99%

“…For examples, the temperature or pressure in the industrial processes that should be kept within a specific bound or the reliability of hybrid power system that combines the integrated renewable energy system and the electric power system. The hybrid power system requires the current to be well bounded within the IEEE limits to guarantee efficient operation for real-world usage [6,14]. Thus, it is preferable to investigate the certain bound or behavior of dynamical systems defined over a finite time interval or known as finite-time stability (FTS).…”

Section: Introductionmentioning

confidence: 99%

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Robust Finite-Time Control of Linear System with Non-Differentiable Time-Varying Delay

Puangmalai

Rojsiraphisal

2020

Symmetry

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Practical systems such as hybrid power systems are currently implemented around the world. In order to get the system to work properly, the systems usually require their behavior to be maintained or state values to stay within a certain threshold. However, it is difficult to form a perfect mathematical model for describing behavior of the practical systems since there may be some information (uncertainties) that is not observed. Thus, in this article, we studied the stability of an uncertain linear system with a non-differentiable time-varying delay. We constructed Lyapunov-Krasovskii functionals (LKFs) containing several symmetric positive definite matrices to obtain robust finite-time stability (RFTS) and stabilization (RFTU) of the uncertain linear system. With the controller and uncertainties in the considered system, there exist nonlinear terms occurring in the formulation process. Past research handled these nonlinear terms as new variables but this led to some difficulty from a computation point of view. Instead, we applied a novel approach via Cauchy-like matrix inequalities to handle these difficulties. In the end, we present three numerical simulations to show the effectiveness of our proposed theory.

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“…. , 7 are positive and satisfy (6). Applying Schur compliment (Lemma 1), we can show that Φ < 0 is equivalent to χ < 0 as in (7).…”

Section: Resultsmentioning

confidence: 92%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Robust Finite-Time Control of Linear System with Non-Differentiable Time-Varying Delay

Puangmalai

Rojsiraphisal

2020

Symmetry

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“…Calculating the energy consumed by the consumer and the amount of electricity supplied to the power grid is called the net metering provided by the electricity distributors [9]. The PV system is supply the energy to the grid by the inverters [10]. Voltage source inverters (VSIs) are commonly used due to their advantages such as easy construction, easiness of development and control [11].…”

Section: Introductionmentioning

confidence: 99%

Power Harvesting Enhancement from PV array and Power Quality Improvement in Grid Connected PV Interleaved Inverter Using Hybrid LSE-WHO Approach

Vidhya¹,

Krishnamoorthi²

2022

Preprint

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This manuscript proposes a hybrid approach for multi-functional grid connected photovoltaic (PV) interleaved inverter using power quality improvement. The proposed approach is a combination of Spherical Evolution Search Algorithm (LSE) and Wild Horse Optimizer (WHO), therefore it is called LSE-WHO approach. The main objective of the proposed approach reduces DC voltage fluctuation and improves power quality. The interleaved inverter is utilized at the grid side, which consists of four legs and every leg contains a power electronic switch and a diode. Due to the configuration of interleaved inverter shoot-through effect is overcome. The system performance is enhanced by the utilization of interleaved inverter. The proposed approach operation is classified into 2 parts such as power harvesting and the harmonics reduction. The LSE approach is utilized to extract the maximum power of PV and the WHO approach is utilized to reduce the harmonics distortion and eliminated the DC link voltage fluctuation through double band hysteresis current controller (DBHCC). DBHCC provides lesser switching frequency, hence, the switching losses is low. By then, the LSE-WHO approach is implemented in the MATLAB site, its performance is compared to the existing approaches. From the simulation, it is conclude that the LSE-WHO approach provides the THD as 2.12% and increase the power quality.

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“…The shoot-through problem is neglected by inserting the dead band circuit to generate dead time among inverter power switching on the same leg for safe operation. The entire VSI power circuit 10,11 is influenced by the enormous amount of power flow caused by the dead band circuit failure. 12 Hardware experiments probably do not support the introduced system.…”

Section: Introductionmentioning

confidence: 99%

A hybrid technique for optimal power quality enhancement in grid-connected photovoltaic interleaved inverter

Vidhya¹,

Krishnamoorthi²

2022

Energy & Environment

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A grid-connected photovoltaic (PV) system with interleaved inverter using a hybrid approach is presented in the paper. Generally, high deviation of DC voltage causes severe damage to the grid-linked system generate power quality issues. Therefore, a hybrid technique called LA-HBO, which is a combination of Lichtenberg optimization algorithm (LA) and heap-based optimizer, is proposed. The proposed method works with the interleaved inverter to realize a multifunctional operation and improve the power quality efficiency of the system. Here, LA techniques improve the power generated from PV and self-charging of the DC-link voltage control loop. The reference current signal is generated through the self-charging DC-link voltage control loop to eliminate the power quality issues. The double band hysteresis current controller generated a minimum switching frequency to provide low switching losses. A MATLAB platform is utilized to implement the proposed system, and the performance of the system is compared with other existing techniques. The test result validated that the proposed system can able to perform multilevel functions and produce power with high quality compared to other techniques. The value for the THD that achieves the proposed hybrid technique is 21.22%. The elapsed time of the proposed hybrid technique is 2.09 seconds.

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Power Quality Enhancement Using Linear Quadratic Regulator Based Current-controlled Voltage Source Inverter for the Grid Integrated Renewable Energy System

Cited by 13 publications

References 30 publications

Robust Finite-Time Control of Linear System with Non-Differentiable Time-Varying Delay

Robust Finite-Time Control of Linear System with Non-Differentiable Time-Varying Delay

Power Harvesting Enhancement from PV array and Power Quality Improvement in Grid Connected PV Interleaved Inverter Using Hybrid LSE-WHO Approach

A hybrid technique for optimal power quality enhancement in grid-connected photovoltaic interleaved inverter

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