资料介绍
光伏逆变器
1 Introduction
Renewable energy technologies are becoming less expensive and more efficient, which have made it an attractive solution of recent energy crises [1, 2]。 Furthermore, renewable energy sources have the advantage that the power is produced in close proximity to where it is consumed. This way the losses because of transmission lines are not present. Among a variety of renewable energy sources, photovoltaic (PV) is predicted to have biggest generation, up to 60% of the total energy by the end of this century [3, 4], because the energy which converted into electrical energy, is the light from the sun is free, available almost everywhere and will still be present for millions of years long after all non-renewable energy sources have been depleted [3, 5]。
The PV generates direct voltage; thus, it requires a converter to convert into a voltage of corresponding amplitude at main frequency for feeding it into utility grid. However, the problem can arises because of the hazardous voltage that can be avoided by providing galvanic isolation between the PV module and the grid through a transformer [6, 7]。 Nevertheless, the use of a transformer leads to additional drawbacks such as less efficiency, bulky, more expansive and less durability. In order to overcome these drawbacks, transformerless inverter has been introduced which has the benefits such as lower cost, higher efficiency, smaller size and weight [6, 8]。 Owing to the missing galvanic separation, large voltage fluctuation both at main frequency and high frequency that depends on the topology structure and control scheme, resulted in leakage current flow from the PV module to the system through the inevitable parasitic capacitance with respect to ground potential [9, 10]。 This ground leakage current increases the grid current harmonics and system losses and also creates a strong conducted and radiated electromagnetic interference [11–13]。 Accordingly, some standards have been established to fix a maximum allowable leakage current such as the German DIN VDE 0126-1-1 standard which states that the grid must be disconnected within 0.3 s if the root-mean-square (RMS) value of leakage current is more than 30 mA [14]。 The RMS values of the fault or leakage current and their corresponding disconnection times are presented in Table 1.
The half-bridge inverter family can eliminate the difficulties of leakage current and injection of DC current into the utility grid having the necessity of high input voltage (700 V) corresponds to 230 V AC application. On the other hand, the problem of leakage current and high input voltage can be solved by using the bipolar sinusoidal pulse-width modulation (SPWM) full-bridge inverter. However, the conversion efficiency of bipolar SPWM inverter is lower because of the high switching losses and magnetic inductor losses. Therefore to solve the problem of leakage current and low efficiency, many DC–AC inverter topologies based on full-bridge inverter have been proposed [6, 8, 15–25]。 Gonzalez et al. [8] proposed full-bridge with DC bypass topology, in which two switches and two diodes are added with a full-bridge inverter. It exhibits low leakage current and high efficiency compared with the full-bridge inverter with bipolar modulation. Another topology with DC bypass is proposed in [21], referred as H5 topology. This topology is patented by SMA Solar Technology AG. Schmidt et al. [26] proposed a highly efficient and reliable inverter concept (HERIC) topology by adding two extra switches in the AC side of a full-bridge inverter. Two extended HERIC topologies are proposed in [16, 27]。 Although these topologies can achieve high efficiency and low leakage current, they have not yet been analysed from the point of view of reactive power handling capacity. In this study, a new transformerless grid-tied PV inverter topology is proposed based on the conventional full-bridge inverter with two additional power switches, which ensures the DC decoupling at the freewheeling mode. As a result, leakage current is minimised to safe level. The proposed topology is also capable to inject reactive power into utility grid; therefore, it can satisfy the requirement of the standard VDE-AR-N 4105. Finally, to verify the accuracy of theoretical analysis, a prototype inverter rated at 1 kW has been built and tested. This study is prepared as follows: topology relationship among existing topologies and their reactive power control capability are analysed in Section 2. The proposed circuit structure, detail operation principle with reactive power flow and differential mode (DM) characteristics of the proposed inverter are investigated in Section 3. Simulation and experimental results are depicted in Sections 4 and 5, respectively, and Section 6 concludes the study.
- 《基于单片机控制的新型交流电压表系统》论文 51次下载
- 倒F天线IEEE论文英文版.pdf 0次下载
- 硕士学位论文《家庭智能网关的研究与实现》 24次下载
- 卫星星地测控链路中的功率控制策略综述 9次下载
- 电动车电机选型和控制策略 41次下载
- 基于DSP的开关功率放大器控制方案 17次下载
- 模块化多电平换流器优化模型预测控制策略研究论文资料下载.pdf 3次下载
- 基于ARM的伺服转台控制系统设计论文资料下载 3次下载
- 一种改善PMSM动态性能的弱磁策略_周华伟 1次下载
- 双馈风力发电系统故障穿越性能改善的控制策略 2次下载
- 一种基于H6桥单相光伏并网逆变器控制策略的研究_康家玉 19次下载
- Vxworks经典论文(40篇) 0次下载
- Vxworks经典论文(40篇) 162次下载
- 基于6δ管理的企业XXX 评价策略-课程设计论文 7次下载
- Vxworks经典论文40篇 32次下载
- IEEE 802.11ad标准的发展历程和使用频率 603次阅读
- 电源设计中电感饱和的原因和避免策略 947次阅读
- 西门子PLC控制经典案例 2330次阅读
- 一种工业上常用改善动态响应的控制方法 593次阅读
- NCP1654的控制策略学习 2388次阅读
- 基于Zin控制策略数字单相PFC实际控制 772次阅读
- 电机控制的经典电路分析 4277次阅读
- 交流伺服电机系统中的控制策略 5229次阅读
- 8个非常实用经典案列,你搞懂了嘛? 2986次阅读
- 模拟电路设计之PID控制策略 9167次阅读
- 通过改进关断时间控制策略优化PFC变换器的设计 1651次阅读
- 分析IEEE 802.11p和IEEE 1609.4协议中的多信道MAC协议 9495次阅读
- 一文详解直接转矩控制策略 1.5w次阅读
- 电动自行车控制器经典设计 2816次阅读
- 基于多区图控制策略的地区电网电压无功优化控制 743次阅读
下载排行
本周
- 1TC358743XBG评估板参考手册
- 1.36 MB | 330次下载 | 免费
- 2开关电源基础知识
- 5.73 MB | 6次下载 | 免费
- 3100W短波放大电路图
- 0.05 MB | 4次下载 | 3 积分
- 4嵌入式linux-聊天程序设计
- 0.60 MB | 3次下载 | 免费
- 5基于FPGA的光纤通信系统的设计与实现
- 0.61 MB | 2次下载 | 免费
- 651单片机窗帘控制器仿真程序
- 1.93 MB | 2次下载 | 免费
- 751单片机大棚环境控制器仿真程序
- 1.10 MB | 2次下载 | 免费
- 8基于51单片机的RGB调色灯程序仿真
- 0.86 MB | 2次下载 | 免费
本月
- 1OrCAD10.5下载OrCAD10.5中文版软件
- 0.00 MB | 234315次下载 | 免费
- 2555集成电路应用800例(新编版)
- 0.00 MB | 33564次下载 | 免费
- 3接口电路图大全
- 未知 | 30323次下载 | 免费
- 4开关电源设计实例指南
- 未知 | 21549次下载 | 免费
- 5电气工程师手册免费下载(新编第二版pdf电子书)
- 0.00 MB | 15349次下载 | 免费
- 6数字电路基础pdf(下载)
- 未知 | 13750次下载 | 免费
- 7电子制作实例集锦 下载
- 未知 | 8113次下载 | 免费
- 8《LED驱动电路设计》 温德尔著
- 0.00 MB | 6653次下载 | 免费
总榜
- 1matlab软件下载入口
- 未知 | 935054次下载 | 免费
- 2protel99se软件下载(可英文版转中文版)
- 78.1 MB | 537796次下载 | 免费
- 3MATLAB 7.1 下载 (含软件介绍)
- 未知 | 420026次下载 | 免费
- 4OrCAD10.5下载OrCAD10.5中文版软件
- 0.00 MB | 234315次下载 | 免费
- 5Altium DXP2002下载入口
- 未知 | 233046次下载 | 免费
- 6电路仿真软件multisim 10.0免费下载
- 340992 | 191185次下载 | 免费
- 7十天学会AVR单片机与C语言视频教程 下载
- 158M | 183279次下载 | 免费
- 8proe5.0野火版下载(中文版免费下载)
- 未知 | 138040次下载 | 免费
评论
查看更多