| 摘要: |
| 根据T型三电平逆变器的特点，提出一种新型无差拍预测控制方法。和传统无差拍方法相比，该方法能够提高电流跟踪的速度和精度，在相同开关频率下可使输出并网电流畸变减少。为了进一步解决T型三电平逆变器固有的中点不平衡问题，提出一种新型SVPWM调制策略实现中点平衡控制。在分析T型三电平逆变器模型的基础上，根据上侧电容和下侧电容电压的差值，通过增加或者减少小矢量作用时间实现中点电位平衡控制。实验结果验证了所提出的新型无差拍控制和SVPWM调制策略可以同时实现并网电流快速跟踪和中点平衡控制问题。 |
| 关键词: T型三电平逆变器 无差拍预测控制 SVPWM 中点平衡控制 快速跟踪 |
| DOI：10.7667/PSPC151766 |
| 分类号: |
| 基金项目:2016年度河南省科技厅科技攻关项目(162102210298);2015年度河南省科技厅科技攻关项目(152102210342);2015年度河南省高等学校重点科研项目(15B470007);2014年许昌市科技发展计划项目(140202049) |
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| Deadbeat predictive current and neutral voltage balancing control method parallel three-level T-type inverters |
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GUO Lihui
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(School of Electrical (Electro-mechanical) Engineering, Xuchang University, Xuchang 461000, China)
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| Abstract: |
| A new deadbeat predictive current control method is proposed according to the characteristics of three-level T-type inverter (3LT2I). Compared to the conventional deadbeat method, this method can fast track the current and reduce the THD of the output current. In order to solve the problem of the neutral-point potential (NP) unbalancing, the novel SPWM method is proposed to realize the NP balance. Based on the model of the 3LT2I, the time of the conventional symmetric SVPWM is changed by adding or subtracting the minimum dwell time based on the upper and lower capacitor voltage. Experiment results from a prototype inverter prove that both NP balance control and fast grid-connected current tracking can be realized using the novel deadbeat controller and SVPWM strategy. |
| Key words: three-level T-type inverter (3LT2I) deadbeat predictive control SVPWM neutral-point potential (NP) control fast tracking |
