A control method of photovoltaic grid-connected inverter based on lcl filter
A control method and inverter technology, applied in photovoltaic power generation, single-network parallel feeding arrangement, output power conversion device, etc., can solve the problem of unsatisfactory control effect, difficulty in realizing fast and stable tracking of output current, and inability to realize actual system Accurate and reliable control and other issues
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[0072] The control method proposed by the present invention is tested on a 17kW three-phase photovoltaic grid-connected inverter prototype. The test parameters are shown in Table 1 below.
[0073] Table 1
[0074]
[0075] The experimental waveform is detected by an oscilloscope, the experimental data is analyzed by a precise power analyzer, and the control method proposed by the present invention is used to obtain experimental data: THD<0.82% (full load, 17kW), DCI<0.35% (full load, 17kW), failure probability ( During the test, the inverter runs continuously for 5 days, and the ratio of downtime to total time) is less than 4.5%.
[0076] The screenshot of the experiment is as follows:
[0077] (1) When the inverter is running stably, detect the inverter output current waveform and its spectrum analysis under full load (17kW) and light load (1kW), and the full load (17kW) is as follows Figure 5 As shown, light load (1kW) such as Image 6 shown. Depend on Figure 5 , ...
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