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A Phase Angle Compensation Control Method for Three-phase LCL Type Grid-connected Inverter in Weak Power Grid

A compensation control and inverter technology, applied in the field of renewable energy power generation systems, can solve problems such as large systems and instability

Active Publication Date: 2020-03-24
HUNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The technical problem to be solved by the present invention is to provide a phase angle compensation control method for a three-phase LCL type grid-connected inverter under a weak power grid to solve the system instability caused by a large phase-locked loop bandwidth. problem, and ensure the dynamic response speed of the system

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  • A Phase Angle Compensation Control Method for Three-phase LCL Type Grid-connected Inverter in Weak Power Grid
  • A Phase Angle Compensation Control Method for Three-phase LCL Type Grid-connected Inverter in Weak Power Grid
  • A Phase Angle Compensation Control Method for Three-phase LCL Type Grid-connected Inverter in Weak Power Grid

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Embodiment Construction

[0043] figure 1 It is the equivalent structure diagram of the three-phase LCL type grid-connected system, the left side is the inverter subsystem, and the right side is the grid subsystem, where: when the photovoltaic array and DC / DC converter or the fan unit and AC / DC converter When the LCL grid-connected inverter is connected to the distribution network, the input of the LCL grid-connected inverter can be equivalent to a DC source. Inverter side inductance L 1 , filter capacitor C 1 and grid side inductance L 2 form the LCL filter, R L1 , R C1 and R L2 L respectively 1 、C 1 and L 2 The parasitic resistance, Z g is the grid impedance, U dc is the DC side voltage, u inv is the output voltage of the inverter, u C1 is the filter capacitor voltage, u PCC is the PCC voltage, u g is the grid voltage, i L1 i C1 and i g Respectively, the inverter side inductor current, filter capacitor current and grid current.

[0044] figure 2 It is the small-signal control bloc...

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Abstract

The invention discloses a phase angle compensation control method for a three-phase LCL-type grid-connected inverter under a weak grid. By introducing common coupling point voltage feedforward, the phase angle of output admittance of the grid-connected inverter at the position of system cut-off frequency is reduced, the problem of system instability caused by relatively wide phase-locked loop bandwidth is solved, and the dynamic response speed of the system is guaranteed.

Description

technical field [0001] The invention relates to the field of renewable energy power generation systems, in particular to a phase angle compensation control method for a three-phase LCL type grid-connected inverter under a weak grid. Background technique [0002] Facing the increasingly urgent energy crisis and the increasing demand for electricity, the development of renewable energy power generation systems has become a feasible and effective way and program. The renewable energy power generation system is mainly composed of photovoltaics, wind turbines, energy storage devices, diesel generators, converters and loads. Among them, the output of photovoltaic power generation, wind power generation, energy storage devices and diesel generators is direct current or high-frequency alternating current. Therefore, in order to meet the power supply demand, the converter acts as the interface between renewable energy and the grid, and plays the role of converting the electric energy...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M7/5387H02J3/40
CPCH02J3/40H02M7/53873
Inventor 罗安杨苓陈燕东陈智勇周乐明周小平伍文华谢志为
Owner HUNAN UNIV