Design method of phase compensation resonance controller in grid-connected inverter

A resonant controller, phase compensation technology, applied in output power conversion devices, AC power input conversion to DC power output, high-efficiency power electronic conversion, etc., can solve threats to the safe and stable operation of distributed power generation systems, grid-connected inverter In order to ensure safe and stable operation, enhance robustness, and improve phase-frequency characteristics

Inactive Publication Date: 2021-01-22
HEFEI UNIV OF TECH
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  • Application Information

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Problems solved by technology

However, in the actual distributed generation system, when the operation mode of the grid changes, the impedance of the grid may vary in a wide range
As the impedance of the grid continues to increase, the stability of the grid-connected inverter system will gradually decrease, and even instability will occur, threatening the safe and stable operation of the distributed generation system.

Method used

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  • Design method of phase compensation resonance controller in grid-connected inverter
  • Design method of phase compensation resonance controller in grid-connected inverter
  • Design method of phase compensation resonance controller in grid-connected inverter

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Embodiment Construction

[0039] figure 1 is the main circuit structure diagram of a typical three-phase LCL grid-connected inverter, where V dc is the DC side voltage of the inverter, I dc is the input current of the inverter, C is the DC side capacitance, L 1 is the inverter side inductance of the LCL filter, C 1 is the filter capacitor of the LCL filter, L 2 is the grid side inductance of the LCL filter, neglecting the inductance L 1 and L 2 The effect of the equivalent series resistance, u ra , u rb and u rc is the output voltage of the inverter bridge, u ca , u cb and u cc is the capacitor voltage, u ga , u gb and u gc is the grid voltage, i 1a i 1b and i 1c is the inverter side current, i 2a i 2b and i 2c is the grid-connected current, i ca i cb and i cc is the capacitive current, and the subscripts a, b, and c in each variable correspond to the physical quantities under phase a, phase b, and phase c. The grid-connected inverter adopts the synchronous sampling method, and t...

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Abstract

The invention discloses a design method of a phase compensation resonance controller in a grid-connected inverter. The method is characterized by comprising the following steps of: neglecting the action of the resonance controller and solving a proportionality coefficient of the phase compensation resonance controller; solving each harmonic coefficient of the phase compensation resonance controller according to the steady-state tracking error requirement of the fundamental wave reference current and the response speed of each resonance controller; further acquiring the maximum phase lag angleof each resonance controller; and finally, integrating the phase lag of the grid-connected inverter system and the resonance controller, and solving the leading phase angle of the phase compensation resonance controller. According to the invention, the robustness of the grid-connected inverter to the impedance change of the power grid can be enhanced, and the safe and stable operation of the grid-connected inverter is ensured.

Description

technical field [0001] The invention belongs to the field of inverter control, and more specifically relates to a design method for a current controller of a grid-connected inverter. Background technique [0002] At present, the continuous development of economy and society has led to the increasing demand for energy in countries all over the world, and the situation of energy shortage and environmental pollution is becoming more and more severe. In order to deal with environmental pollution and achieve sustainable energy development, my country's distributed power generation system based on renewable energy has achieved tremendous development in recent years. As an interface device between the distributed power generation system and the grid, the grid-connected inverter Its function is to invert the direct current generated by the previous stage of renewable energy into high-quality power frequency alternating current to be sent to the grid. However, with the continuous dev...

Claims

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Application Information

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IPC IPC(8): H02M7/5387H02M1/088
CPCH02M1/088H02M7/5387Y02B70/10
Inventor 谢宝施永苏建徽赖纪东张健汪海宁杜燕杨向真
Owner HEFEI UNIV OF TECH
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