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Keeping in the mind of smart power generation, the Superconducting Magnetic Energy Storage (SMES) system is proposed along with a Modified Leaky Least Mean Square (MLLMS) control algorithm. Specifically, the compensation of current harmonics, reactive power and even the temporary supply failures due to intermittent nature of the power generation are performed in this paper. The efficient control algorithm...
A control strategy of three-level multi-functional grid-connected inverter for distributed grid is proposed. According to different conditions of distributed generation, the multi-functional inverter can realize the function of injecting power from the distributed generation and suppling power into the grid simultaneously or separately, and the function of shunt active power filters such as the harmonic...
Apart from high power density, unified power quality conditioner (UPQC) offers a cost-effective and energy-efficient way to deal with power quality issues. A single-phase transformer-less unified power quality conditioner (TL-UPQC) utilizing four switching devices only is presented. The proposed UPQC consists of two voltage source inverters, one is connected in parallel with the load and another one...
The detection of the fundamental frequency and phase angle of the positive sequence grid voltages are utmost necessary for the proper operation of controlled active power converters, which require to operate stable and robust even during the presence of diverse power quality issues. There exist various utility grid synchronization and detection methods based on Phased-Locked Loop (PLL) techniques...
This paper proposes a dual output Luo converter fed SRM (Switched Reluctance Motor) drive. The proposed converter generates two symmetrical output voltages. In order to obtain PFC (power factor correction) operation drive is operated in DCM (discontinuous conduction mode). The current through two output inductor is discontinuous in each switching period. The converter provides high efficiency, high...
In this paper a full-bridge phase-shift DC-DC converter that has the function of realizing zero-voltage switching (ZVS) is adopted into power electronic transformer (PET), and the functions of every part employing proper control strategy in the PET are analyzed. The simulation results show that this converter can still realize soft-switching in PET and it is appropriate to work in high frequency state...
In the distributed generation systems, three-phase inverters are the basement because they are used as power electronics interface between the generators and the grid. Cascaded multi-level H-bridge inverters are widely used for industrial application due to the simple topology and good power quality. However, unbalanced power source problem will easily happen in such an application. In this paper,...
In this paper, the performance of a Single DSTATCOM is evaluated for the purpose of harmonics elimination, reactive power compensation and load balancing. A control scheme has been proposed for DSTATCOM and its characteristics are investigated by digital simulation. A current controller on the single-phase basis forms the innermost loop in the control hierarchy. The dc bus voltage controller and PCC...
The major problem incorporated in the distribution system is the power quality problem. Now a day, power quality problems have been mitigated with the help of custom power devices. In this work, a novel approach to nine switch Unified Power Quality Conditioner (UPQC) is used instead of conventional twelve switch power conditioner which reduces the switching stress, less commutation, low losses with...
The ac-ac converters with bipolar voltage gain are desired for utility voltage compensation. In this paper, a single-phase buck-boost ac-ac converter is proposed with versatile operating modes and bipolar voltage gain capability. It consists of six bidirectional voltage blocking switches and an inductor, apart from input/output filtering capacitors. The key features include no shoot-through or commutation...
In this paper new method for voltage and reactive power control in passive distribution networks is proposed. This method considers limited number of switching operations actual for distribution networks with overweared equipment. This situation is common for Russian networks and proposed algorithm aimed to improve power quality by efficient voltage and reactive power control. Algorithm based on cluster...
There are presented the results of the research of the efficiency of multi-agent management of voltage mode in electric grids, diagrams of power delivery of power stations. In the structure of devices for voltage regulation in a controllable area, there was considered the use of the normalizer of AC voltage, in particular as the means of emergency control, controlling the stability of motoring load...
The article considers algorithms of operating the multiphase unit for balancing main load based on selection of load phase connection to electric network phases with retaining an original order of load phases interlace. The influence of the operating algorithms on the load asymmetry coefficients of zero and negative sequences at the electrical point is analyzed based on computer modeling the treed...
This paper presents the analysis, development, and experimental performance of a predictive current controller that is featured with a disturbance estimator. The developed current controller is designed to operate a single phase (1φ) grid-side power electronic converter (PEC) employed in photovoltaic (PV) systems. The disturbance estimator is used to reduce the controller sensitivity to parameter...
This paper describes a power factor improvement of canonical switching converter for BLDC motor by using voltage follower technique. In this paper (BLCSC) Bridge Less Canonical Switching Cell Converter runs in a discontinuous inductor current mode. Due to this near unity power factor is obtained. The DC link voltage at the front end of VSI fed BLDC motor is changed to control the speed of the motor...
The utility interface (UI) converter is a three-phase power conversion unit equipped with energy storage which governs the interaction between the utility grid and the microgrid. The non-interruptive operation of UI is desired due to its several functions: 1) in grid-connected operation it performs as a voltage-supporting unit regulating the power flow through the microgrid point of common coupling,...
A conventional Unified Power Quality Conditioner (UPQC) is a back-to-back shunt and series converters with a dc-link capacitor, requires 12 switches to resolve voltage and current related power quality issues. Recently a nine-switch UPQC (NS-UPQC) is proposed, but suffers with certain limitations like limited reference amplitude and phase shift, twice the rated dc-link voltage and increased stress...
This paper focus on specially designed DG based Power Quality Conditioner for Micro Grid applications. Three leg inverter coupled with solar PV with MPPT used as Compensator can be used for distinct DGs in the micro grid for power quality improvement of the entire system. Optimum control can be achieved to avoid detraction for voltage, current and Power flowing between Grid and DG. By adjusting power...
The presented article deals with various issues related to ‘Power Quality (PQ) problems’. One of the reason to get these kind of PQ issues were mainly due to intermittent power generation due to Distributed Energy Resources (DER). However, problem may also occurs in non linearites originated from power system, subsequently can often damage the system. All these issues can be addressed with the power...
Multilevel inverter enables to completely remove the passive filtering requirement at the grid interfacing end, resulting in improved efficiency and reduced cost. These features have led to increasing attention towards their application to medium and high-power arena. In this paper, investigation of a hybrid 9-level inverter topology for grid integration of renewable energy sources is presented. The...
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