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Robust control method based on SSR-KDF for grid-connected inverter

A robust control and inverter technology, applied in the field of robust control of grid-connected inverters

Active Publication Date: 2014-10-15
ZHEJIANG UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The invention is a grid-connected inverter SSR control method that ensures stable operation of the system and improves system robustness, and effectively improves the shortcomings of the new energy grid-connected power generation system, which is nonlinear and susceptible to uncertain factors such as the environment

Method used

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  • Robust control method based on SSR-KDF for grid-connected inverter
  • Robust control method based on SSR-KDF for grid-connected inverter
  • Robust control method based on SSR-KDF for grid-connected inverter

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specific Embodiment

[0089] The control method proposed by the present invention is tested on a 20kW three-phase grid-connected inverter prototype. The test parameters are shown in Table 1 below.

[0090] Table 1

[0091]

[0092] Detect experimental waveform by oscilloscope, analyze experimental data by accurate power analyzer, adopt the control method that the present invention proposes, gained experimental data: THD<1.5% (full load, 20kW), failure probability (inverter uninterrupted operation 10 days during test , the ratio of downtime to total time) is less than 2.5%.

[0093] The screenshot of the experiment is as follows:

[0094] (1) When the inverter is running stably, the output current waveform of the inverter is detected under full load (20kW) and light load (1kW), and the full load (20kW) is as follows Figure 5 As shown, light load (1kW) such as Image 6 shown. Depend on Figure 5 , Image 6 It can be seen that the inverter output current control method proposed by the prese...

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Abstract

The invention discloses a robust control method based on SSR-KDF for a grid-connected inverter. An output signal of a direct current bus voltage control ring, which is controlled by PI, serves as a reference value for output current of the grid-connected inverter, a tracking value of an actual value of the output current and a differential signal are extracted from an output end of the grid-connected inverter and serve as an input signal of a grid-connected inverter controller to be input into the gird-connected inverter controller, an indirect control signal of the grid-connected inverter is output and obtained after calculation, and the reference value for the output current of the inverter is subtracted from the indirect control signal of the grid-connected inverter to obtain actual control quantity of the inverter so as to control the grid-connected inverter. By the robust control method, running stability of a system is improved, halting failure caused by factors such as uncertainty on a system structure is avoided, grid-connected power quality is improved, and harmonic distortion of output electric energy of the grid-connected inverter is effectively reduced.

Description

technical field [0001] The invention relates to an inverter control method, in particular to a robust control method for a grid-connected inverter based on SSR-KDF. Background technique [0002] With the development of new energy distributed power generation technology, the penetration rate of grid-connected inverters in the power grid is gradually increasing. However, due to the unbalanced and aging characteristics of the devices that make up the grid-connected inverter, and the fact that new energy power generation is easily affected by environmental factors, the grid-connected inverter system has obvious nonlinearity and uncertainty. These problems will not only adversely affect the stable operation of the system, but also deteriorate the power supply reliability and power quality of the local grid through coupling with the grid. Therefore, it is urgent to find a nonlinear control strategy for grid-connected inverters that improves robustness and overcomes the influence ...

Claims

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Application Information

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IPC IPC(8): H02M7/48H02J3/38
Inventor 杨捷齐冬莲张国月吴越辛焕海张建良
Owner ZHEJIANG UNIV
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