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Method for designing hybrid damping parameter of LCL filter in photovoltaic grid-connected inverter

A hybrid damping and filter technology, applied in the field of new energy grid-connected power generation, can solve problems such as difficulty in taking into account the adaptability of grid parameters at the same time

Inactive Publication Date: 2011-11-30
TSINGHUA UNIV
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Problems solved by technology

[0005] The invention proposes a damping design method for the LCL filter of the photovoltaic grid-connected system for the problem that it is difficult to simultaneously take into account the grid parameter adaptability, damping resistance loss, and the influence of control non-ideal factors in the conventional photovoltaic grid-connected LCL filter damping control.

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  • Method for designing hybrid damping parameter of LCL filter in photovoltaic grid-connected inverter
  • Method for designing hybrid damping parameter of LCL filter in photovoltaic grid-connected inverter
  • Method for designing hybrid damping parameter of LCL filter in photovoltaic grid-connected inverter

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[0038] This design is to provide a damping solution for the photovoltaic grid-connected system using LCL filtering. The method flow is as follows figure 1 shown. Taking a photovoltaic inverter grid-connected system as an example to carry out the damping design of the present invention, the parameters of the LCL filter are shown in Table 1, and the circuit diagram of the grid-connected system and its single-phase simplified diagram are shown in figure 2 and image 3shown. The specific implementation is as follows:

[0039] Table 1 LCL filter parameter values

[0040]

[0041] 1. Clarify system design requirements and parameters. The system adopts active and passive damping cooperative control method for damping control, and when the grid inductance changes between 0 and 1.6mH, the damping coefficient does not change more than 20%. The filter parameters are shown in Table 1, and the system parameters are shown in Table 2.

[0042] Table 2 LCL filter parameter values

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Abstract

The invention discloses a method for designing a hybrid damping parameter of an LCL filter in a photovoltaic grid-connected inverter, and belongs to the technical fields of new energy sources and distributed grid-connected generation. The method is characterized in that: the resonance of the LCL filter is suppressed by adopting an active damping / passive damping cooperative working method, whereina filter capacitive current feedback control method is adopted for an active damping part and the method of connecting filtering capacitance in series with damping resistance is adopted for a passivedamping part. For the LCL filter, the damping resistance required by passive damping and a feedback coefficient of active damping are computed under the condition of ensuring a sufficient damping coefficient, and a designed cooperative damping control scheme is checked to make the loss of the damping resistance as low as possible, avoid the influence of system control delay on damping running; and the damping is adapted to strong power grid access and the weak power grid access of remote areas. The method is applied to photovoltaic grid-connected generation systems adopting the LCL filter, fuel cells and grid-connected wind power generation systems.

Description

technical field [0001] The invention relates to a damping method of an LCL filter for photovoltaic grid-connected use that reduces the influence of control non-ideal factors and enhances damping adaptability, and belongs to the technical field of new energy grid-connected power generation. Background technique [0002] With the gradual depletion of fossil energy, renewable energy power generation has become an issue that the world attaches great importance to. Photovoltaic power generation, as an important new energy that is emerging, has received special attention. Solar energy is a clean and inexhaustible renewable energy source. Our country is rich in solar radiation resources and has a huge amount to be developed. The installed capacity of photovoltaic power generation in the world has shown an exponential growth trend in the past ten years, and 90% of them are grid-connected power generation systems. Therefore, the development and improvement of photovoltaic grid-conn...

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Application Information

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IPC IPC(8): H02J3/38
CPCY02E10/563Y02E10/56
Inventor 雷一赵争鸣贺凡波鲁思兆袁立强鲁挺
Owner TSINGHUA UNIV
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