A star-delta rectification type high-power DC boost converter and its control method
A DC step-up and step-up transformer technology, applied in the direction of converting DC power input to DC power output, irreversible AC power input converting to DC power output, output power conversion device, etc., can solve the problem of introducing circulating current, etc. Improve the withstand voltage value, filter out harmonic current, reduce the effect of DC ripple
Active Publication Date: 2018-07-27
HUNAN UNIV
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However, series-parallel connection will introduce circulation and the need to increase redundancy to improve reliability
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[0018] figure 1 It is a specific application of the present invention in grid-connected photovoltaic power generation. As shown in the figure, the photovoltaic array can be regarded as a low-voltage and high-current DC source. In order to realize its grid connection, its electric energy must first be imported into the high-voltage DC bus. The invention provides an interface for importing its electric energy.
[0019] see figure 2 , the DC voltage of the front stage inverter bridge photovoltaic array of the present invention is inverted into two pairs of symmetrical three-phase alternating currents with a phase difference of 15° (as shown in FIG. 3 ). The frequency and voltage of the six-phase alternating current are regulated by the control loop of the inverter bridge. The frequency of the output voltage can be controlled between 50Hz and 500Hz. Two sets of three-phase symmetrical voltages are respectively connected to two three-phase three-winding transformers. According...
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The invention disclosers a star angle-shaped rectifier-type high-power DC step-up converter and a control method thereof. The step-up converter comprises two pre pi-shaped CLC filter devices, two three-phase inverter bridges, two three-phase three-winding step-up transformers and two six-phase diode rectifier bridges. the pi-shaped CLC filter device filters AC harmonic current poured in a low-voltage DC network. the two three-phase inverters are controlled to output two groups of three-phase symmetrical voltage with a phase difference of 15-DEG. The two groups of three-phase symmetrical voltage are respectively connected onto the three-phase three-winding transformers, and the transformer adopts a Y / Y / Delta connection mode. Two groups of voltage outputted by the transformer are respectively fed in the two groups of six-phase diode rectifier bridges, the single rectifier bridge outputs 12-pulse wave DC voltage. The two diode rectifier bridges are serially connected, and a midpoint is led out and grounded. The DC step-up device is large in capacity, high in efficiency, low in DC ripples at the high-voltage output side, and has good application prospect in the DC power transmission field.
Description
technical field [0001] The invention relates to a large-capacity, high-efficiency, low-ripple DC booster device, which can be used in the field of DC power transmission with renewable new energy sources, and can be used to boost the DC voltage output by large-scale photovoltaic power stations and wind farms. into the high-voltage DC bus for DC transmission. Background technique [0002] With the development of power electronics technology and the grid connection of a large number of renewable new energy sources, the advantages of direct current transmission have gradually emerged. Compared with AC transmission, DC transmission has technical and economic advantages in many fields, such as low line cost, small transmission loss, and high power supply reliability. There are only two lines for direct current transmission, which requires less construction costs, and the loss under the same power transmission condition is much smaller than that of alternating current. At the same...
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IPC IPC(8): H02M3/335H02M7/25
CPCH02M3/335H02M7/25
Inventor 罗安何志兴马伏军贺西徐千鸣易伟浪
Owner HUNAN UNIV