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2019 IEEE 10th International Symposium on Power Electronics for Distributed Generation Systems (PEDG)最新文献

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Analysis of Inertia and Damping Characteristics of Grid-connected Photovoltaic Power Generation System Based on Droop Control 基于下垂控制的并网光伏发电系统惯性和阻尼特性分析
Yongbin Wu, Sue Wang, L. Xiong, Donghui Zhang
The grid-connected photovoltaic power generation system (GPPGS) with high proportion of renewable energy has the ability to load balance. A strategy is proposed for GPPGS based on droop control. The electric torque analysis method (ETAM) is used to establish mathematical model of the system with DC voltage timescale (DVT) and analyze the influence law of inertia, damping and synchronization characteristics from the physical mechanism perspective. The research finds that the equivalent inertia, damping and synchronization parameters of the system are determined by the control parameters, structural parameters and steady-state operating point parameters. Changing the control parameters is the simplest and most flexible way to influence the inertia damping and synchronization ability of the system. The inertia characteristics of the system are greatly influenced by the control parameter Kp and enhanced with the increase of Kp. The damping characteristics of the system are obviously affected by the control parameter Dp and weakened with the increase of Dp. The synchronization effect of the system is only controlled by the parameter Ki and enhanced with the increase of Ki. The effectiveness and correctness of the analysis conclusion are verified by simulation.
可再生能源比重高的并网光伏发电系统具有负载均衡能力。提出了一种基于下垂控制的GPPGS控制策略。利用电转矩分析方法(ETAM)建立了具有直流电压时间标度(DVT)的系统数学模型,从物理机理角度分析了惯性、阻尼和同步特性的影响规律。研究发现,系统的等效惯量、阻尼和同步参数由控制参数、结构参数和稳态工作点参数决定。改变控制参数是影响系统惯性阻尼和同步能力的最简单、最灵活的方法。系统的惯性特性受控制参数Kp的影响较大,且随Kp的增大而增强。系统的阻尼特性受控制参数Dp的影响较大,且随Dp的增大而减弱。系统的同步效应仅受Ki参数的控制,且随Ki的增大而增强。通过仿真验证了分析结论的有效性和正确性。
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引用次数: 2
Design of Parallel Converters with L-Filter and Reduced Filter Size l -滤波器并联变换器及减小滤波器尺寸的设计
Zhongyi Quan, Y. Li
Parallel converters have been widely applied in distributed generations. The use of LCL filter in parallel converters may induce several stability challenges due to the filter resonance. To eliminate the filter resonance related issues, this paper presents a system level design that allows the use of small L filter without sacrificing system current quality. The key of the design is to identify the required number of converters in parallel. The L-filter based design is applicable in systems with either common or separate DC links. In this paper, parallel two-level converters with separate DC links are considered in the design, showing that the required number of converters is irrelevant to system parameters like DC voltage or power rating. Multilevel converters are also included in the study. Furthermore, the behaviour of dominant harmonics in different load condition is also investigated, using common DC link type parallel converters as an example. Simulation results and preliminary experimental results are obtained and presented.
并联变流器在分布式发电中得到了广泛的应用。在并联变流器中使用LCL滤波器可能会由于滤波器共振而引起稳定性挑战。为了消除滤波器谐振相关问题,本文提出了一种系统级设计,允许在不牺牲系统电流质量的情况下使用小L滤波器。设计的关键是确定所需的转换器并联数量。基于l滤波器的设计适用于具有公共或单独直流链路的系统。本文在设计中考虑了具有独立直流链路的并联双电平变换器,表明所需变换器的数量与直流电压或额定功率等系统参数无关。多电平转换器也包括在研究中。此外,还以普通直流链路型并联变流器为例,研究了不同负载条件下主谐波的变化规律。给出了仿真结果和初步实验结果。
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引用次数: 0
Power Management of a Residential Hybrid Photovoltaic Inverter with Battery Energy Storage System 住宅混合光伏逆变器与电池储能系统的电源管理
Wei Xiong, Jianwu Zeng, Liangcai Wu, Hao Cheng
This paper presents power management of a grid-connected photovoltaic (PV) inverter with battery energy storage system (BESS) for the residential application. The overall system is controlled at the grid level and converter level. At the grid level, the inverter is capable of regulating the power provided by the system controller. At the converter level, the inverter system with BESS can manage the power while considering the priorities of the battery or the grid, e.g., battery first and the grid first. Different controllers are designed to control the battery power, inverter power, and the PV power when their priorities are changed. The experimental results show that with the designed controllers, the system is not only capable of dealing with the local load and source change, but also can participate the system level control by regulating the amount power provided by the upper level controllers.
本文介绍了一种住宅用光伏并网逆变器电池储能系统的电源管理。整个系统在电网级和变换器级进行控制。在电网层面,逆变器能够调节系统控制器提供的功率。在变流器层面,具有BESS的逆变系统可以在考虑电池或电网优先级的同时管理功率,例如电池优先和电网优先。当电池功率、逆变器功率和光伏功率的优先级发生变化时,设计了不同的控制器来控制它们。实验结果表明,采用所设计的控制器,系统不仅能够处理局部负载和电源的变化,而且可以通过调节上层控制器提供的功率量参与系统的电平控制。
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引用次数: 2
Sensorless Control Scheme of DFIG Wind Energy Conversion Systems Based on SOGIs and FLL 基于SOGIs和FLL的DFIG风能转换系统无传感器控制方案
Anh Tan Nguyen, Dong-Choon Lee
In this paper, a novel sensorless control scheme for double-fed induction generator (DFIG) wind turbine systems using the second-order generalized integrators (SOGIs) and frequency-locked loop (FLL) is proposed. The rotor speed is estimated based on the SOGIs, whereas the FLL is used to correct the estimated rotor position. Since the SOGI has a characteristic of adaptive filters, the rotor speed can be well estimated despite the existence of ripples in the rotor currents. The feasibility of the proposed method has been verified by simulation results.
针对双馈感应发电机(DFIG)风力发电系统,提出了一种基于二阶广义积分器(sogi)和锁频环(FLL)的无传感器控制方案。基于sogi估计转子转速,而利用FLL对估计的转子位置进行校正。由于SOGI具有自适应滤波的特性,因此尽管转子电流中存在纹波,但仍能很好地估计转子转速。仿真结果验证了该方法的可行性。
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引用次数: 5
Generic Derivation of Optimal Architecture for A Resilient Microgrid with Graph Theory 基于图论的弹性微电网最优结构的一般推导
Na Chen, Hao Wang, Haijin Li, Dehong Xu
A resilient microgrid for high-surety power, known as Super Uninterruptable Power Supply (Super UPS), is an evolution of traditional UPS. It consists of multiple sources and multiple energy storage components. Besides high efficiency and low cost, reliable power conversion architecture is required. In this paper, a systemic and machine-based way to derive the optimal power conversion topology for the high-surety power supply with multiple sources and energy storage components is investigated. First is the generation of power supply architectures. The architectures are generated and the reasonable ones are selected based on their connectivity. Second part is the evaluation algorithm including cost evaluation, efficiency evaluation and availability evaluation of a given architecture. After evaluating tens of thousands of topologies of architectures, the optimal architectures can be selected. Finally, taking a real Super UPS as example, the proposed method is applied to find the optimal architectures.
超级不间断电源(Super不间断电源,Super UPS)是在传统UPS的基础上发展而来的一种提供高保证电力的弹性微电网。它由多个电源和多个储能组件组成。除了高效率和低成本外,还需要可靠的电源转换架构。本文研究了一种基于系统和机器的方法来推导具有多电源和储能组件的高保证电源的最优功率转换拓扑。首先是电源架构的生成。生成体系结构,并根据其连通性选择合理的体系结构。第二部分是评估算法,包括给定体系结构的成本评估、效率评估和可用性评估。在对数以万计的体系结构拓扑进行评估后,可以选择最优的体系结构。最后,以一个实际的超级UPS为例,应用该方法寻找最优结构。
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引用次数: 3
A Novel MPPT Strategy Based on Decentralized Control in subDPP Systems 子dpp系统中一种基于分散控制的MPPT策略
Shengyu Wang, J. Fletcher
This paper presents a simple decentralized control technique based on relative gain array with an outside-in maximum power point tracking strategy (MPPT) for submodule differential power processing systems. The proposed strategy can achieve at least twice the convergence rate as the traditional one-way MPPT strategy. Furthermore, the proposed control technique has better utilization of control inputs and scales well in a long photovoltaic string. Moreover, the resultant symmetrical transfer functions enable easy controller tuning in a long string. The effectiveness of the strategy is validated by PLECS simulation.
针对子模块差分功率处理系统,提出了一种基于相对增益阵列和由外至内最大功率点跟踪策略的简单分散控制技术。该策略的收敛速度至少是传统单向MPPT策略的两倍。此外,该控制技术具有更好的控制输入利用率,并且在长光伏串中具有良好的可扩展性。此外,由此产生的对称传递函数使控制器在长串中易于调谐。通过PLECS仿真验证了该策略的有效性。
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引用次数: 0
A Novel Adaptive Observer-Based DC-Link Voltage Control for Grid-Connected Power Converters 一种基于观测器的并网电源变流器直流链路电压自适应控制方法
Guanhong Song, Bo Cao, Liuchen Chang, Riming Shao
In the past decades, renewable energy has been experiencing significant growth due to the increasing energy demand and critical environmental issues. In order to perform power conversion and grid integration for these distributed energy resources, grid-connected power converters are therefore widely used. In a typical three-phase grid-connected power converter, DC-link capacitors are normally used as an energy buffer to maintain a proper DC voltage for the power conversion. However, the DC-link voltage varies significantly when the input power from the distributed energy resources changes rapidly. Hence, a proper DC-link voltage controller is essential to perform fast DC-link voltage regulation. In this paper, a novel adaptive observer-based DC-link voltage control is proposed for three-phase grid-connected power converters to minimize the DC-link voltage fluctuation and to improve the stability of the state observer.
在过去的几十年里,由于不断增长的能源需求和严峻的环境问题,可再生能源经历了显著的增长。为了对这些分布式能源进行电力转换和并网,并网电源变流器得到了广泛的应用。在典型的三相并网功率变换器中,直流链路电容器通常用作能量缓冲器,以保持功率转换所需的适当直流电压。然而,当来自分布式能源的输入功率快速变化时,直流链路电压变化明显。因此,一个合适的直流电压控制器是必不可少的,以执行快速直流电压调节。本文提出了一种基于自适应观测器的三相并网电源变换器直流电压控制方法,以减小直流电压波动,提高状态观测器的稳定性。
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引用次数: 1
An RC Snubber Circuit to Suppress False Triggering Oscillation for GaN Based Half-Bridge Circuits 一种抑制氮化镓半桥电路误触发振荡的RC缓冲电路
Jian Chen, Quanming Luo, Zhiqing Wang, Pengju Sun, Xiong Du, Yuqi Wei
Due to low on-state resistance and parasitic parameters, GaN devices can cause false triggering oscillation in practical systems that will affect system performance. In this paper, an RC snubber circuit is proposed to suppress false triggering oscillation in a half-bridge circuit and the design method of the RC parameters is proposed. The proposed oscillation suppression method is simpler, easier to implement, and more effective than the active gate driver. The proposed method is verified by experiment results. And it can provide guidance for oscillation suppression design in high-order systems.
由于低导通电阻和寄生参数,GaN器件在实际系统中可能导致误触发振荡,从而影响系统性能。本文提出了一种抑制半桥电路误触发振荡的RC缓冲电路,并给出了RC参数的设计方法。所提出的振荡抑制方法比有源栅极驱动器更简单、更容易实现、更有效。实验结果验证了该方法的有效性。对高阶系统的振荡抑制设计具有一定的指导意义。
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引用次数: 5
Design of Observer-Based SMC Controller for Three-Phase LCL-Filtered Grid-Connected Inverters with Less Sensors 基于观测器的低传感器三相lc滤波并网逆变器SMC控制器设计
Han Li, Weimin Wu, Min Huang
Currently, Sliding Mode Control (SMC) controller based on global stability has been successfully applied to three-phase LCL-flltered Grid-Connected Inverter (GCI). However, to achieve the global stability of the system, all three state vectors are required to provide the full information, which would utilize many sensors, increasing the cost and complexity. In this paper, an observer-based SMC controller for three-phase LCL-flltered GCI is proposed. The discrete state observer is adopted to estimate the state vectors (inverter-side current and capacitor voltage) needed for the SMC controller. In addition, the detailed design of the SMC controller and the discrete state observer are introduced. The experimental results obtained from a 3kW system demonstrate the effectiveness of the proposed control strategy.
目前,基于全局稳定性的滑模控制(SMC)控制器已成功应用于三相lcl滤波并网逆变器(GCI)中。然而,为了实现系统的全局稳定性,需要所有三个状态向量都提供完整的信息,这将使用许多传感器,增加了成本和复杂性。本文提出了一种基于观测器的三相lcl滤波GCI的SMC控制器。采用离散状态观测器估计SMC控制器所需的状态向量(逆变器侧电流和电容电压)。此外,还详细介绍了控制器和离散状态观测器的设计。在一个3kW系统上的实验结果证明了所提控制策略的有效性。
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引用次数: 0
Power quality of Single-Phase Standalone Inverter with linear and nonlinear load 线性和非线性负载下单相独立逆变器的电能质量
Jose Luis Mata Ledesma, O. Carranza Castillo, R. González, Jaime José Rodríguez Rivas
In this paper, the implementation of sliding mode control SMC in a standalone inverter is analyzed and developed. This in order to improve the performance of the inverter when feeding various types of loads, such as purely resistive loads, resistive-inductive, resistive-capacitive loads and non-linear loads. The parameters that are evaluated are waveform of the output voltage, total harmonic distortion of the inverter output voltage, its response between load changes and disturbances in the load. The novel proposal in this paper is the implementation of the sliding modes control through the averaged control of the PWM modulator, because the sliding mode control for its best performance proposes an infinite switching frequency, which cannot be achieved in an inverter due to your power devices. For this reason, in this paper an integrated structure is plated which allows the sliding mode control to work at a fixed frequency. The results of the inverter's performance with the sliding mode control are compared with a PI, P-Resonant control in the current loop, where it is observed that the implementation of the integrated structure with the sliding mode control has better performance
本文对滑模控制SMC在独立逆变器中的实现进行了分析和开发。这是为了提高逆变器在馈电各种类型负载时的性能,如纯阻性负载、阻感性负载、阻容性负载和非线性负载。评估的参数包括输出电压的波形、逆变器输出电压的总谐波失真、其在负载变化和负载扰动之间的响应。本文提出的新颖方案是通过PWM调制器的平均控制来实现滑模控制,因为滑模控制的最佳性能提出了无限的开关频率,这在逆变器中由于功率器件的原因无法实现。为此,本文设计了一种集成结构,使滑模控制工作在固定频率下。将采用滑模控制的逆变器性能与电流环中的PI, p -谐振控制进行了比较,发现采用滑模控制的集成结构具有更好的性能
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引用次数: 0
期刊
2019 IEEE 10th International Symposium on Power Electronics for Distributed Generation Systems (PEDG)
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