单相固态变压器逆变级的建模与控制
为了实现固态变压器逆变级在不同调制方式的高性能控制要求,采用开关周期平均法和小信号扰动法,建立了单相固态变压器逆变级在双极性调制和单极性调制方式下的连续数学模型,并分别推导了内环电流对占空比的传递函数以及外环电压对电流的传递函数。明确了其数学模型和传递函数在单极性和双极性调制方式下是不一致的,避免了采用同一个数学模型所导致的控制性能不佳等问题。依据串级系统原理,设计了外环电压子系统和内环电感电流子系统,并提出了具体PI控制器参数设计方法。实验结果表明,建立的系统模型正确,且逆变级输出电压稳态精度高,响应速度快,电压总谐波畸变率低,表明控制策略设计合理。...
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| Published in | 电测与仪表 Vol. 53; no. 5; pp. 58 - 63 |
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| Main Author | |
| Format | Journal Article |
| Language | Chinese |
| Published |
煤矿电气设备与智能控制山西省重点实验室,太原 030024
2016
太原理工大学 电气与动力工程学院,太原 030024 |
| Subjects | |
| Online Access | Get full text |
| ISSN | 1001-1390 |
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| Summary: | 为了实现固态变压器逆变级在不同调制方式的高性能控制要求,采用开关周期平均法和小信号扰动法,建立了单相固态变压器逆变级在双极性调制和单极性调制方式下的连续数学模型,并分别推导了内环电流对占空比的传递函数以及外环电压对电流的传递函数。明确了其数学模型和传递函数在单极性和双极性调制方式下是不一致的,避免了采用同一个数学模型所导致的控制性能不佳等问题。依据串级系统原理,设计了外环电压子系统和内环电感电流子系统,并提出了具体PI控制器参数设计方法。实验结果表明,建立的系统模型正确,且逆变级输出电压稳态精度高,响应速度快,电压总谐波畸变率低,表明控制策略设计合理。 |
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| Bibliography: | Zheng Lijun, Gao Yunguang,Song Jiancheng , Lv Shixuan, Xue Wei （ 1. College of Electrical and Power Engineering, Taiyuan University of Technology, Taiyuan 030024, China. 2. Shanxi Key Laboratory of Mining Electrical Equipment and Intelligent Control, Taiyuan 030024, China） 23-1202/TH solid state transformer; inverter stage; modulation mode; transfer function; PI controller In order to realize high performance control requirement for inverter stage of solid state transformer under different modulation mode,the small-signal dynamic models of single-phase inverter stage under bipolar and unipolar PWM modulation are built up based on the switching cycle average method and the small signal perturbation method.Consequently,the current to duty cycle transfer function and voltage to current transfer function are deduced respectively. It can be seen that the mathematical models and transfer functions are not consistent under bipolar and unipolar modulation mode,and it avoids the poor control performance problem when usin |
| ISSN: | 1001-1390 |