基于LLCL型并网逆变器的复合控制方法
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TM464

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上海市电站自动化技术重点实验室(13DZ2273800)、上海市重点科技攻关计划(14110500700)


Composite Control Method Based on LLCL Grid-connected Inverter
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Shanghai Key Laboratory of Power Plant Automation Technology (13DZ2273800)、Shanghai Key Science and Technology Research Project (14110500700)

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    摘要:

    LLCL(电感-电感-电容-电感)型并网逆变器因存在串联谐振支路,能够极大地衰减开关频率处的电流谐波成分。在两相静止αβ坐标系下,采用双闭环控制策略对并网电流直接进行控制。比例复数积分控制能实现交流信号的无静差跟踪,但其动态性能差,准比例谐振控制不仅能实现对交流信号的控制还能保留一定的带宽。故外环采用比例复数积分和准比例谐振控制并联的新型控制策略,内环采用电容电流反馈的有源阻尼方法抑制LLCL逆变器存在的谐振问题。最后基于RT-LAB搭建了半实物仿真实验平台并建立LLCL型并网逆变器模型,通过半实物仿真实验验证了控制策略的可行性。

    Abstract:

    The LLCL (inductance-inductance-capacitance-inductance) type grid-connected inverter could greatly attenuate the current harmonic components at the switching frequency due to the series resonant branch. A double loop control strategy was directly used to control the grid-connected current in the two-phase stationary αβ coordinate system. Proportional complex integral control could achieve no static tracking of AC signals, but its dynamic performance was poor. Quasi-proportional resonance control not only could control the AC signal but also retained a certain bandwidth. Therefore, a new control strategy of proportional complex integral and quasi-proportional resonance control in parallel was adopted for the external loop, and the active damping method of capacitive current feedback was used for the inner loop to suppress the resonance problem existing in the LLCL inverter. Finally, a semi-physical simulation experimental platform was built based on RT-LAB and an LLCL grid-connected inverter model was established. The feasibility of the control strategy is verified through semi-physical simulation experiments.

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刘洋,杨旭红,郭凯,等. 基于LLCL型并网逆变器的复合控制方法[J]. 科学技术与工程, 2020, 20(33): 13688-13696.
liuyang, 吴斌. Composite Control Method Based on LLCL Grid-connected Inverter[J]. Science Technology and Engineering,2020,20(33):13688-13696.

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  • 收稿日期:2020-02-09
  • 最后修改日期:2020-09-09
  • 录用日期:2020-03-24
  • 在线发布日期: 2020-12-18
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