A phase synchronization control scheme for LCL‐T type high‐frequency current source in parallel connection

Passive resonant tanks (PRTs) with immittance property are suitable candidates to achieve constant output current in load resonant converters (LRCs). In this paper, fifth-order Π-type LC networks are investigated to accede this target. At the first step, fifth-order Π-type passive LC networks that can be applied as a PRT are specified based on source and sink natures. Also, their structural advantages are described in detail to give a suitable perspective for the topology selection. At the second step, immittance property is verified for the proposed topologies and immittance PRTs (IPRTs), with their immittance operation conditions, are derived. To confirm the effectiveness, a 150-W LRC is implemented leveraging new Π-type IPRTs. A deep investigation is devoted to analyze the current/voltage stress in the components of the designed LRC. Moreover, kVA/kW ratio is considered as a key parameter for the reactive component size minimization. The proposed constant current LRC presents high load regulation capability in addition to the minimum reactive power and zero-voltage switching (ZVS) on the inverter MOSFETs under the various loads. A significant robustness against load variations, less sensitivity versus parameters variation, and relatively higher efficiency are the main superiorities of the fifth-order IPRTs to the lower order counterparts.

Section: Discussionmentioning

confidence: 99%

Fifth‐order Π‐type load resonant converters analysis based‐on immittance property for constant output current applications

Khoshsaadat

Ehsanipour

2018

“…

cosα goodbreak= \frac{{({kV}_{dc})}^{2} B_{ST} - Q_{ST}}{normalk V_{dc} V_{L} B_{ST}}

normalk

and

B_{ST}

are the STATCOM coefficient and susceptance as in Saxena and Kumar 14 . STATCOM is a switch‐based device, so a filter circuit is required for smoothening its output waveform 43–45 . A T‐shaped LCL filter with damping resistance is used for the same as in previous works 44–46 .…”

Section: Modelling Details For Microgrid Componentsmentioning

confidence: 99%

“…STATCOM is a switch‐based device, so a filter circuit is required for smoothening its output waveform 43–45 . A T‐shaped LCL filter with damping resistance is used for the same as in previous works 44–46 . L 1 , an inverter side inductor, L 2 , a load side inductor, C f , capacitor filter, and R f , damping resistance expression can be expressed as 45

L_{1} goodbreak= \frac{V_{italicdc}}{6 \times f_{s} \times I_{cr}}

C_{f} goodbreak= 0.1 goodbreak\times C_{b}

L_{2} goodbreak= \frac{\sqrt{\frac{1}{k_{a}^{2}}} + 1}{C_{f} \times ω_{s}^{2}}

f_{res} goodbreak= \frac{1}{2 π} \sqrt{\frac{L_{1} + L_{2}}{L_{1} \times L_{2} \times C_{f}}}

R_{f} goodbreak= \frac{1}{6 π \times f_{res} \times C_{f}}

…”

Section: Modelling Details For Microgrid Componentsmentioning

confidence: 99%

“…14 STATCOM is a switch-based device, so a filter circuit is required for smoothening its output waveform. [43][44][45] A T-shaped LCL filter with damping resistance is used for the same as in previous works. [44][45][46] L 1 , an inverter side inductor, L 2 , a load side inductor, C f , capacitor filter, and R f , damping resistance expression can be expressed as 45…”

Section: Statcom Modelingmentioning

confidence: 99%

See 1 more Smart Citation

Frequency regulation for microgrid using genetic algorithm and particle swarm optimization tuned STATCOM

Saxena¹,

Gao

Sharma

et al. 2022

This paper presents the genetic algorithm (GA) and particle swarm optimization (PSO) based frequency regulation for a wind‐based microgrid (MG) using reactive power balance loop. MG, operating from squirrel cage induction generator (SCIG), is employed for exporting the electrical power from wind turbines, and it needs reactive power which may be imported from the grid. Additional reactive power is also required from the grid for the load, directly coupled with such a distributed generator (DG) plant. However, guidelines issued by electric authorities encourage MGs to arrange their own reactive power because such reactive power procurement is defined as a local area problem for power system studies. Despite the higher cost of compensation, static synchronous compensator (STATCOM) is a fast‐acting FACTs device for attending to these reactive power mismatches. Reactive power control can be achieved by controlling reactive current through the STATCOM. This can be achieved with modification in current controller scheme of STATCOM. STATCOM current controller is designed with reactive power load balance for the proposed microgrid in this paper. Further, gain values of the PI controller, required in the STATCOM model, are selected first with classical methods. In this classical method, iterative procedures which are based on integral square error (ISE), integral absolute error (IAE), and integral square of time error (ISTE) criteria are developed using MATLAB programs. System performances are further investigated with GA and PSO based control techniques and their acceptability over classical methods is diagnosed. Results in terms of converter frequency deviation show how the frequency remains under the operating boundaries as allowed by IEEE standards 1159:1995 and 1250:2011 for integrating renewable‐based microgrid with grid. Real and reactive power management and load current total harmonic distortions verify the STATCOM performance in MG. The results are further validated with the help of recent papers in which frequency regulation is investigated for almost similar power system models. The compendium for this work is as following: (i) modelling of wind generator‐based microgrid using MATLAB simulink library, (ii) designing of STATCOM current controller with PI controller, (iii) gain constants estimation using classical, GA and PSO algorithm through a developed m codes and their interfacing with proposed simulink model, (v) dynamic frequency responses for proposed grid connected microgrid during starting and load perturbations, (vi) verification of system performance with the help of obtained real and reactive power management between STATCOM and grid, and (vii) validation of results with available literature.

“…14 V power network only accommodates a limited capacity of electrical system, while 42 V power network has to confront the challenges from electric arcs and connector corrosion [2,3]. High-frequency alternating current (HFAC) power distribution system initially proposed for aerospace system becomes an attractive alternative to DC distribution system recently as a result of high power density and voltage conversion convenience [4]. However, the available applications of high-frequency power distribution are mainly located within computer and telecom with small power capacity and short distribution distance [5][6][7].…”

Section: Introductionmentioning

confidence: 99%

An integrated controller for high‐frequency LCLC resonant inverter with phase‐shifted control and frequency regulation

Liu

Zeng

2016

Self Cite

SUMMARYHigh-frequency alternating current has an extensive application as a result of outstanding advantages. The aim of the study is to develop a high-frequency power source to feed the auxiliary loads of vehicle application such as electric fans, blower motors, and lighting. A feasible implementation of high-frequency power source is examined by a full-bridge LCLC resonant inverter. The corresponding control scheme is proposed for the fourth-order resonant inverter to confront the control challenges of low output harmonics and dynamic nonlinear load. Firstly, an analysis parameter S r is defined to address the possible impacts of the varying operational frequency to output THD and ZVS features. Secondly, an integrated control scheme is presented to implement pulse-width control at heavy load and frequency regulation at light load. Lastly, an experimental prototype is accomplished with the peak voltage of 35 V and the output power of 120 W. The accordance of experimental results and theoretical analysis testifies that the proposed control scheme can achieve the low harmonics and high conversion efficiency over a wide scope of operational conditions.