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Dynamic simulation of three-phase nine-level multilevel inverter with switching angles optimized using nature-inspired algorithm 基于自然启发算法的开关角优化三相九电平多电平逆变器动态仿真
Q2 Energy Pub Date : 2021-03-01 DOI: 10.11591/IJPEDS.V12.I1.PP325-333
W. T. Chew, W. Yong, J. S. Ong, J. Leong, T. Sutikno
This paper recommends the use of grasshopper optimization algorithm (GOA), a nature-inspired optimization algorithm, for optimizing switching-angle applied to cascaded H-bridge multilevel inverter (CHBMLI). Switching angles are selected based on the minimum value of the objective function formulated using the concept of selective harmonic minimization pulse width modulation (SHMPWM) technique. MATLAB/Simulink-PSIM dynamic co-simulation conducted on a 3-phase 9-level CHBMLI shows that the CHBMLI controlled using GOA derived switching-angle is able to respond to varying modulation index demand and synthesize an AC staircase output voltage waveform with the desired fundamental harmonic and minimized selected low-order harmonics. Compared to Newton Raphson (NR) technique, GOA is able to find optimum switching-angle solutions over a wider modulation index range. Compared to Genetic Algorithm (GA), GOA is able to find global minima with higher probability. The simulation results validate the performance of GOA for switching-angle calculation based on the concept of SHMPWM.
本文推荐使用一种受自然启发的优化算法——蚱蜢优化算法(GOA)来优化级联H桥多电平逆变器(CHBMLI)的开关角。基于使用选择性谐波最小化脉宽调制(SHMPWM)技术的概念制定的目标函数的最小值来选择开关角度。在三相9电平CHBMLI上进行的MATLAB/Simulink PSIM动态联合仿真表明,使用GOA导出的开关角控制的CHBMLI能够响应变化的调制指数需求,并合成具有所需基波和最小化所选低阶谐波的AC阶梯输出电压波形。与Newton-Raphson(NR)技术相比,GOA能够在更宽的调制指数范围内找到最佳开关角解决方案。与遗传算法相比,GOA能够以更高的概率找到全局极小值。仿真结果验证了基于SHMPWM概念的GOA在开关角计算中的性能。
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引用次数: 2
Soft start-up strategy of pulse-density-modulated series-resonant converter for induction heating application 用于感应加热的脉冲密度调制串联谐振变换器的软启动策略
Q2 Energy Pub Date : 2021-03-01 DOI: 10.11591/IJPEDS.V12.I1.PP258-272
P. Herasymenko, V. Pavlovskyi
This paper presents a soft start-up strategy of pulse-density-modulated series-resonant converter for induction heating application. The pulse-density modulation (PDM) technique is widely used in converters based on voltage-source series-resonant inverters (SRIs) to control the output current or power. However, during a start-up process, PDM has some disadvantages both in inrush current limiting and providing a zero-voltage switching operation of SRI transistors. In the paper, different PDM techniques are considered and basic moments of PDM using within the start-up process are analyzed. A new soft start-up strategy of PDM converter for induction heating application is proposed. The main features of the proposed strategy include an interleaved or a stepped PDM control, an initial combination of PDM at the beginning of the start-up process, and an operating algorithm during the start-up process. The proposed strategy was verified by a 2.5 kW experimental setup of the pulse-density-modulated interleaved converter with an operating frequency from 50 kHz up to 100 kHz. Experimental results confirm the effectiveness of the proposed start-up strategy and show that the maximum current amplitude within start-up processes exceeds the maximum steady-state current amplitude by no more than 30%.
本文提出了一种用于感应加热应用的脉冲密度调制串联谐振变换器的软启动策略。脉冲密度调制(PDM)技术广泛应用于基于电压源串联谐振逆变器(SRI)的转换器中,以控制输出电流或功率。然而,在启动过程中,PDM在浪涌电流限制和提供SRI晶体管的零电压开关操作方面都有一些缺点。本文考虑了不同的PDM技术,分析了PDM在启动过程中使用的基本时刻。针对感应加热应用,提出了一种新的PDM变换器软启动策略。所提出的策略的主要特征包括交错或步进PDM控制、启动过程开始时PDM的初始组合以及启动过程中的操作算法。通过工作频率从50kHz到100kHz的脉冲密度调制交错转换器的2.5kW实验装置验证了所提出的策略。实验结果证实了所提出的启动策略的有效性,并表明启动过程中的最大电流幅度超过最大稳态电流幅度不超过30%。
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引用次数: 6
A dual-switch cubic SEPIC converter with extra high voltage gain 具有超高压增益的双开关立方SEPIC转换器
Q2 Energy Pub Date : 2021-03-01 DOI: 10.11591/IJPEDS.V12.I1.PP199-211
C. R. F. Mbobda, A. Dikandé
To provide a high votage conversion ratio, conventional non-isolated DC-DC boost topologies, which have reduced voltage boost capability, have to operate with extremely high duty cycle ratio, higher than 0.9. This paper proposes a DC-DC converter which is mainly based on the narrow range of duty cycle ratio to achieve extra high voltage conversion gain at relatively reduced voltage stress on semiconductors. In addition, it does include any magnetic coupling structure. The structure of the proposed converter combines the new hybrid SEPIC converter and voltage multiplier cells. From the steady-state analysis, this converter has wide conversion ratio and cubic dependence with respect to the duty ratio and then, can increase the output voltage several times more than the conventional and quadratic converters at the same duty cycle ratio. However, the proposed dual-switch cubic SEPIC converter must withstand higher voltage stress on output switches. To overcome this drawback, an extension of the proposed converter is also introduced and discussed. The superiority of the proposed converter is mainly based on its cubic dependence on the duty cycle ratio that allows it to achieve extra high voltage gain at reduced voltage stress on semiconductors. Simulation results are shown and they corroborate the feasibility, practicality and validity of the concepts of the proposed converter.
为了提供高电压转换比,传统的非隔离DC-DC升压拓扑结构的升压能力降低,必须在高于0.9的极高占空比下工作。本文提出了一种主要基于窄占空比范围的DC-DC变换器,在相对降低半导体电压应力的情况下实现超高的电压转换增益。此外,它还包括任何磁耦合结构。该转换器的结构结合了新型混合式SEPIC转换器和电压乘法器单元。从稳态分析来看,该变换器对占空比具有较宽的转换率和三次依赖性,在相同占空比下,其输出电压比常规变换器和二次变换器提高数倍。然而,所提出的双开关立方SEPIC变换器必须承受输出开关上更高的电压应力。为了克服这一缺点,本文还介绍并讨论了该转换器的扩展。所提出的转换器的优势主要是基于其对占空比的三次依赖,这使得它能够在降低半导体电压应力的情况下获得额外的高电压增益。仿真结果验证了所提变换器概念的可行性、实用性和有效性。
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引用次数: 2
State feedback control of advanced static var compensator using a five-level NPC inverter topology 基于五电平NPC逆变器拓扑的先进静态无功补偿器状态反馈控制
Q2 Energy Pub Date : 2021-03-01 DOI: 10.11591/IJPEDS.V12.I1.PP345-355
Mansour Benyamina, A. Tahri, A. Boukortt
This paper deals with the modeling and control of an advanced static var compensator (ASVC) using a five-level neutral point-clamped (NPC) voltage source inverter (VSI). The nonlinear state space model of the five-level ASVC is obtained from the d-q axis frame. The effectiveness of this compensator highly depends on the choice of the control strategy. The proposed state feedback control (SFC) technique is applied to adjust the ASVC Var flow with the AC transmission network and achieve DC voltage capacitor balance. The dynamic performance of the ASVC based SFC controller is evaluated under several operating conditions. The simulation results demonstrate that the proposed SFC control strategy is highly robust compared to the conventional Proportional-Integral (PI) control.
本文研究了一种采用五电平中性点箝位电压源逆变器(VSI)的先进静态无功补偿器(ASVC)的建模和控制。在d-q轴坐标系下建立了五能级ASVC的非线性状态空间模型。该补偿器的有效性在很大程度上取决于控制策略的选择。将状态反馈控制(SFC)技术应用于交流输电网络对ASVC无功流进行调节,实现直流电压电容平衡。对基于ASVC的SFC控制器在多种工况下的动态性能进行了评价。仿真结果表明,与传统的比例积分(PI)控制相比,所提出的SFC控制策略具有很高的鲁棒性。
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引用次数: 1
Modeling and simulation of forces applied to the horizontal axis wind turbine rotors by the vortex method coupled with the method of the blade element 涡旋法结合叶片单元法对水平轴风力机转子受力进行建模与仿真
Q2 Energy Pub Date : 2021-03-01 DOI: 10.11591/IJPEDS.V12.I1.PP413-420
Ibtissem Barkat, A. Benretem, F. Massouh, Issam Meghlaoui, A. Chebel
This article aims to study the forces applied to the rotors of horizontal axis wind turbines. The aerodynamics of a turbine are controlled by the flow around the rotor, or estimate of air charges on the rotor blades under various operating conditions and their relation to the structural dynamics of the rotor are critical for design. One of the major challenges in wind turbine aerodynamics is to predict the forces on the blade as various methods, including blade element moment theory (BEM), the approach that is naturally adapted to the simulation of the aerodynamics of wind turbines and the dynamic and models (CFD) that describes with fidelity the flow around the rotor. In our article we proposed a modeling method and a simulation of the forces applied to the horizontal axis wind rotors turbines using the application of the blade elements method to model the rotor and the vortex method of free wake modeling in order to develop a rotor model, which can be used to study wind farms. This model is intended to speed up the calculation, guaranteeing a good representation of the aerodynamic loads exerted by the wind.
本文的目的是研究施加在水平轴风力发电机转子上的力。涡轮的空气动力学是由转子周围的气流控制的,因此各种工况下转子叶片上的空气充注量及其与转子结构动力学的关系的估计对设计至关重要。风力涡轮机空气动力学的主要挑战之一是用各种方法预测叶片上的力,包括叶片单元矩理论(BEM),这是一种自然适应于风力涡轮机空气动力学模拟的方法,以及精确描述转子周围流动的动力学和模型(CFD)。本文提出了一种利用叶片单元法和自由尾迹法对水平轴风力转子进行建模和受力仿真的方法,以建立可用于风电场研究的转子模型。该模型旨在加快计算速度,保证良好地表示风施加的气动载荷。
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引用次数: 0
The cascade methods of doubly-fed induction machine for generator system 发电机系统双馈感应电机的串级方法
Q2 Energy Pub Date : 2021-03-01 DOI: 10.11591/IJPEDS.V12.I1.PP112-120
Diep-Dung Nguyen, Ngoc-Hoan Than, Duc-Tuan Hoang
This paper presents two solutions to cascade the doubly-fed induction machines in the power generator systems. The first solution is a traditional one with the power control circuit located on the stator-side. The second solution is a new one with the power control circuit located on the rotor-side. After analysis and evaluation, it is shown that the solution with the power control circuit located on the rotor side has advantages over the solution with the power control circuit located on the stator-side. Therefore, the authors chose the solution which is a power control circuit located on the rotor side to study, analyze in-depth and run the simulation. The results show that the proposed solution has a very good quality, the output voltage of the generator always follows the grid-voltage even when changing the gird-voltage or changing the speed of the generator.
本文提出了两种解决双馈感应电机级联的方法。第一种解决方案是将功率控制电路置于定子侧的传统解决方案。第二种解决方案是一种新的电源控制电路位于转子侧。经过分析和评价,表明功率控制电路位于转子侧的方案比位于定子侧的方案具有优势。因此,笔者选择了在转子侧设置功率控制电路的方案进行深入的研究、分析和仿真。结果表明,该方案具有很好的质量,即使改变电网电压或发电机转速,发电机的输出电压也始终跟随电网电压。
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引用次数: 0
Impact of the hybrid reactive power compensator on the power grid used a fuzzy PI regulator 混合无功补偿器对电网的影响采用了模糊PI调节器
Q2 Energy Pub Date : 2021-03-01 DOI: 10.11591/IJPEDS.V12.I1.PP170-182
A. Rahmouni
The work presented in this article is a contribution to the problem of controlling reactive powers and voltages in an electrical network. Among these control tools, the static reactive power compensator (SVC) was chosen because of its simplicity of control. SVC is one of the Alternative Flexible Current Transmission Systems (FACTS) devices which help to solve the problems encountered in the operation of electrical networks, either on the distribution side or on the transport side. To increase its compensation efficiency in the face of harmonic currents which cause voltage distortion, we have introduced a three-phase harmonic filter. This new hybrid SVC is used to control the reactive power, the voltage and in addition to reduce the voltage distortion and the correction of the power factor in the electrical energy transport network. In order to improve its efficiency, two voltage regulation systems have been chosen in the control system for this compensator, the fuzzy PI regulator and the PIP regulator.
本文所做的工作是对电网中无功功率和电压控制问题的贡献。在这些控制工具中,选择静止无功补偿器(SVC)是因为其控制简单。SVC是一种可替代的柔性电流传输系统(FACTS)设备,有助于解决配电侧或输电侧电网运行中遇到的问题。为了提高其在谐波电流导致电压失真时的补偿效率,我们引入了一种三相谐波滤波器。这种新型混合SVC用于控制无功功率、电压,此外还用于减少电能传输网络中的电压失真和功率因数校正。为了提高其效率,在该补偿器的控制系统中选择了模糊PI调节器和PIP调节器两种电压调节系统。
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引用次数: 1
Direct control of active and reactive power for a grid-connected single-phase photovoltaic inverter 并网单相光伏逆变器有功与无功的直接控制
Q2 Energy Pub Date : 2021-03-01 DOI: 10.11591/IJPEDS.V12.I1.PP139-150
E. Radwan, M. Nour, Ali M. Baniyounes, Khalid S. Al Olimat, E. Awada
This paper presents a single-phase grid-connected photovoltaic system with direct control of active and reactive power through a power management system of a Photovoltaic inverter. The proposed control algorithm is designed to allow maximum utilization of the inverter’s available KVA capacity while maintaining grid power factor and current total harmonic distortion (THD) requirements within the grid standards. To reduce the complexity and improve the efficiency of the system, two independent PI controllers are implemented to control single-phase unipolar PWM voltage source inverter. One controller is used to control the power angle, and hence the active power flow, while the other controller is used to control the reactive power, and consequently the power factor by adjusting the voltage modulation index of the inverter. The proposed system is modelled and simulated using MATLAB/Simulink. The PV inverter has been examined while being simultaneously connected to grid and local load. Results obtained showed the ability of the PV inverter to manage the active and reactive power flow at, and below rated levels of solar irradiances; resulting in an increased inverter utilization factor, and enhanced power quality. The proposed system, was capable of operating at power factors in the range of 0.9 lead or lag for reactive power compensation purposes and delivered its power at a wide range of solar irradiance variations.
本文介绍了一种通过光伏逆变器的功率管理系统直接控制有功和无功功率的单相并网光伏系统。所提出的控制算法旨在最大限度地利用逆变器的可用KVA容量,同时将电网功率因数和电流总谐波失真(THD)要求保持在电网标准内。为了降低系统的复杂性,提高系统的效率,采用了两个独立的PI控制器来控制单相单极PWM电压源逆变器。一个控制器用于控制功率角,从而控制有功功率流,而另一个控制器则用于通过调节逆变器的电压调制指数来控制无功功率,从而控制功率因数。利用MATLAB/Simulink对所提出的系统进行了建模和仿真。光伏逆变器在同时连接到电网和本地负载时进行了检查。所获得的结果表明,光伏逆变器能够在额定太阳能辐射水平及以下管理有功和无功功率流;从而导致逆变器利用率的提高和电能质量的提高。所提出的系统能够在0.9超前或滞后范围内的功率因数下运行,用于无功功率补偿,并在大范围的太阳辐照度变化下提供功率。
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引用次数: 6
Synthesis of SMC algorithms applied to wind generator 应用于风力发电机的SMC算法综合
Q2 Energy Pub Date : 2021-03-01 DOI: 10.11591/IJPEDS.V12.I1.PP404-412
Houaria Abdelli, A. Mezouar, M. Bendjebbar, Kh. Belgacem
The use of the classical (SMC) applied to control of stator’s powers of DFIG, gives the problem of chattering, therefore to avoid this phenomenon a robust algorithm (STSMC) is applied. This paper presents a comparison of conventional SMC with the proposed strategy of STSMC algorithm. The results are obtained using MATLAB and demonstrate stability and robustness of this algorithm.
将经典(SMC)应用于DFIG定子功率的控制,产生了抖振问题,因此采用了鲁棒算法(STSMC)来避免这种现象。本文将传统的SMC与所提出的STSMC算法策略进行了比较。使用MATLAB获得了结果,并证明了该算法的稳定性和鲁棒性。
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引用次数: 1
Design and performance evaluation of a PV interface system based on inductive power transfer 基于感应功率传输的光伏接口系统设计与性能评价
Q2 Energy Pub Date : 2021-03-01 DOI: 10.11591/IJPEDS.V12.I1.PP364-373
A. Ragab, M. Marei, M. Mokhtar, Ahmed Abdel-Sattar
This paper presents a photovoltaic (PV) based battery charger utilizing a wireless power transfer (WPT) interface system. The double-sided inductor-capacitor-capacitor (LCC) compensation network is utilized for the inductive power transfer (IPT) system. Because of nonlinear characteristics of the PV, the maximum power point tracking (MPPT) is achieved by controlling the phase displacement angle or the pulse width of the quasi-square pulse inverter connected to the transmitting coil of the IPT system. As a result, the power transferred to the secondary-side, which is connected to a battery bank, is regulated. The IPT-based PV interface system is designed to achieve zero voltage switching (ZVS) in the primary side at rated conditions to minimize the switching loss. Extensive simulation studies are carried out using EMTDC/PSCAD software to investigate the dynamic performance of the proposed IPT-based PV interface system.
本文介绍了一种基于光伏(PV)的电池充电器,该充电器采用无线传输(WPT)接口系统。将电感-电容-电容(LCC)补偿网络应用于感应功率传输(IPT)系统。由于光伏的非线性特性,通过控制与IPT系统发射线圈相连的准平方脉冲逆变器的相位角或脉宽来实现最大功率点跟踪(MPPT)。因此,传输到与电池组相连的二次侧的电力受到调节。基于ipt的PV接口系统旨在在额定条件下实现一次侧零电压开关(ZVS),以最小化开关损耗。利用EMTDC/PSCAD软件进行了广泛的仿真研究,以研究所提出的基于ipt的PV接口系统的动态性能。
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引用次数: 2
期刊
International Journal of Power Electronics and Drive Systems
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