lcl type grid-connected inverter current control system and its active high-frequency damping method

A current control and control system technology, which is applied in the direction of AC network circuit, AC power input conversion to DC power output, electrical components, etc., can solve the problems of digital controller current control gain limitation, etc., to improve stability characteristics and reduce complexity degree, the effect of suppressing resonance

Active Publication Date: 2022-04-15
XIAN UNIV OF TECH
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Problems solved by technology

[0004] The purpose of the present invention is to provide an LCL type grid-connected inverter current control system and its active high-frequency damping method, which solves the problem that the current control gain of the existing digital controller is limited

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  • lcl type grid-connected inverter current control system and its active high-frequency damping method
  • lcl type grid-connected inverter current control system and its active high-frequency damping method
  • lcl type grid-connected inverter current control system and its active high-frequency damping method

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Embodiment Construction

[0050] The present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0051] The grid-connected current control system includes the main circuit part and the control circuit part, the main circuit part is as figure 1 The topology shown, including the DC-link voltage v dc , grid voltage v g and the LCL filter together constitute the LCL grid-connected inverter, the DC bus voltage v dc The anode of the switch tube G 1 , G 3 , G 5 The collector is connected, the DC bus voltage v dc The negative pole of the switch tube G 2 , G 4 , G 6 The emitter is connected, the switch tube G 1 , G 3 , G 5 The emitters are respectively connected with the switch tube G 2 , G 4 , G 6 The collector is connected, the switch tube G 2 , G 4 , G 6 The collectors are respectively connected with the inductor L 1a , L 1b , L 1c Connected to one end of the inductor L 1a , L 1b , L 1c The other end of the capacitor C ...

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Abstract

The invention discloses an active high-frequency damping method for current control of an LCL type grid-connected inverter, which specifically includes the following steps: the inverter side current reference value i L1_ref The error value Δe is obtained by making a difference with the feedback amount, that is, the predicted current. The error value is output by the proportional controller, and the output signal is divided into three signal streams, one is used as the input of the high-frequency damping unit, and the other is partially output by the current reconstruction and prediction unit. , the other way has the feed-forward coefficient k g The common coupling voltage v pcc Adding, the obtained sum is output by the time-delay unit, and the output value is applied to the control object to obtain the output value, that is, the grid-connected current i L2 , the output and input current i of the current reconstruction and prediction unit L2 Add them together to get the predicted current. The current reconstruction method avoids the sampling of the inverter side current, reduces the complexity of the system hardware, improves the stability characteristics of the system, compensates the delay of the system, and reduces the dynamic and static errors of the system.

Description

technical field [0001] The invention belongs to the technical field of grid-connected current control, and in particular relates to an LCL type grid-connected inverter current control system and an active high-frequency damping method thereof. Background technique [0002] With the increasing global environmental pollution and fossil energy crisis, the utilization of clean and renewable energy has been widely concerned and developed. Wind energy, solar energy and other non-hydropower renewable energy power generation technologies have become a hot research topic, and the core of new energy power generation grid connection is the grid-connected inverter, which has high requirements for power quality, and grid-connected filters are usually used To reduce switching noise, the LCL filter can filter out the high-order harmonics injected into the grid by the grid-connected inverter. The inductance connected in series with the power grid can also suppress the inrush current, so th...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J3/38H02J3/01H02M7/5387
CPCH02J3/382H02J3/01H02M7/53871Y02E40/40
Inventor 张琦赵双双张永平孙向东任碧莹安少亮杨惠李尚阔潘存旭
Owner XIAN UNIV OF TECH
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