| 引用本文: | 王若醒,吴迎霞,杨恢宏,等.两级式T型三电平光伏逆变器的关键技术研究及实现[J].电力系统保护与控制,2015,43(4):58-62. |
| WANG Ruoxing,WU Yingxia,YANG Huihong,et al.Research on key technologies of double-stage T-type three-level photovoltaic inverter[J].Power System Protection and Control,2015,43(4):58-62 |
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| 摘要: |
| 随着分布式光伏系统的发展，对并网电能质量的要求越来越高。并网逆变器作为系统的核心设备，其性能优劣直接决定了系统的稳定性。相对于传统的两电平逆变器，三电平逆变器具有开关损耗小、效率高、谐波含量小以及dv/dt较低的优点。因T型拓扑比NPC结构损耗小、Diode数量少、独立驱动电源少，介绍一种T型两级式三电平拓扑结构，研究了基于dq坐标变换的双闭环控制策略、避免三角函数计算的SVPWM算法及其DSP实现，提出了中点电位不平衡的抑制方法。最后采用该算法研制了一台10 kW样机，试验结果表明了控制算法的有效性。 |
| 关键词: 三电平逆变器 T型拓扑 SVPWM 中点电位 |
| DOI：10.7667/j.issn.1674-3415.2015.04.009 |
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| Research on key technologies of double-stage T-type three-level photovoltaic inverter |
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WANG Ruoxing1, WU Yingxia2, YANG Huihong1, TANG Yunlong1
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1.XJ Group Corporation Micro-Grid, Co., Xuchang 461000, China;2.Chongqing Grid Corporation of State Grid,
Chongqing 400014, China
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| Abstract: |
| With the development of distributed photovoltaic system, the requirement of grid quality is more and more higher. As the core equipment, the performance of grid inverter directly determines the stability of the system. Compared with traditional two level inverter, three level inverter has the advantages of switch loss, high efficiency, low harmonic content and lower dv/dt. Compared with the NPC, T topological structure has the loss small, less diode quantity, less independent drive power supply. A double-stage T-type three-level topology is introduced, the dq coordinate transformation-based double closed-loop control strategy and SVPWM algorithm without trigonometric functions, as well as its DSP implementation are studied, and a neutral point imbalance suppression method is proposed. Finally, a 10 kW prototype is developed, the results show that the control algorithm is effective. |
| Key words: three-level inverter T-type topology SVPWM neutral point |
