| 引用本文: | 李春鹏,孙绍华.数字控制对并网逆变系统稳定性和动态性能的影响[J].电力自动化设备,2012,32(3): |
| LI Chunpeng,SUN Shaohua.Influence of digital control on stability and dynamic performance of grid-connected inverter system[J].Electric Power Automation Equipment,2012,32(3): |
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| 摘要: |
| 详细分析了模拟控制和数字控制中采样过程、零阶保持、滞后一拍控制对系统稳定性和动态性能的影响。分析结果表明随着数字控制各环节的引入，系统产生了明显的控制延时，导致系统闭环特征方程的阶次升高，不仅减小了系统的临界稳定增益，而且还使系统的动态性能变差。为此采用预测控制来消除数字控制延时造成的影响。最后，将数字比例控制和预测控制应用到由DSP芯片控制的逆变器样机中，通过对比2种控制系统输出电压和电流的动、静态波形，验证了分析结果的正确性。 |
| 关键词: 数字控制系统 采样 零阶保持 滞后一拍 预测控制系统 稳定性 动态性能 |
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| Influence of digital control on stability and dynamic performance of grid-connected inverter system |
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LI Chunpeng1,2, SUN Shaohua1,3
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1.School of Electrical Engineering and Automation，Harbin Institute of Technology，Harbin 150001，China;2.Heilongjiang Province Education College，Harbin 150080，China;3.College of Automation and Electronic Engineering，Qingdao University of Science and Technology，Qingdao 266042，China
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| Abstract: |
| The effect of the sampling process，zero-order-hold and one-step-delay of analog or digital control on the control system stability and dynamic performance is analyzed. Results show that，along with the introduction of digital control to more system sections，significant control delay is generated，which leads to the increase of closed-loop characteristic equation order，the decrease of system critical stable gain and the degradation of system dynamic performance. The digital proportional control and the predictive control are applied to the DSP-controlled inverter prototype to eliminate the effect of digital control delay，and the accuracy of analytical results is validated by comparing the dynamic and static waveforms of output voltage and current between two control systems. |
| Key words: digital control systems sampling zero-order-hold one-step-delay predictive control systems stability dynamic performance |
