High gain dc/dc converter for mppt link of photovoltaic inverter
A technology of photovoltaic inverters and converters, which is applied in the direction of output power conversion devices, DC power input conversion to DC power output, instruments, etc., which can solve the problem of large voltage stress/current stress of power switch tubes, high cost and high efficiency. Low and other issues, to achieve the effect of wide MPPT range, high conversion efficiency, and low voltage stress
Inactive Publication Date: 2016-02-10
江苏博纬新能源科技有限公司
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Problems solved by technology
[0004] As far as the prior art is concerned, most of the methods to solve this problem are through isolated DC / DC converters such as push-pull converters, etc., such DC / DC converters require isolated sampling and driving, and the implementation cost is relatively high; in addition , there are also cascaded converters and switched inductor / switched capacitor converters. However, the cascaded converter needs to increase the voltage step by step, so the structure is more complicated and the efficiency is low, while the switched inductor / switched capacitor converter The gain of the converter is limited, and the voltage stress / current stress of the power switch tube is relatively large
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[0027] Such as figure 1 As shown, a high-gain DC / DC converter used in the MPPT link of a photovoltaic inverter includes a dual-tube structure with two power switch tubes, a DC voltage source V i , output power diode D 0 and filter capacitor C, DC voltage source V i Connected to the input terminal of the dual-tube structure, the output power diode D 0 After being connected in series with the filter capacitor C, it is connected to the output terminal of the dual-tube structure. The filter capacitor C is the output terminal of the DC / DC converter, and the load R L And connected to the output end of the filter capacitor C.
[0028] Preferably, the dual-tube structure includes a first inductor, a second inductor L 2 , the first power switch tube S 1 , the second power switch tube S 2 ; Among them, the first power switch tube S 1 The anode of the first inductor and one end of the first inductor are respectively connected to the DC voltage source V i The positive pole of the ...
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The invention discloses a high-gain DCDC (Direct Current Direct Current) converter for an MPPT (Maximum Power Point Tracking) link of a photovoltaic inverter. The high-gain DCDC converter comprises a double tube structure with two power switch tubes, a direct current voltage source, an output power diode and a filter capacitor, wherein the direct current voltage source is connected with an input end of the double tube structure; the output power diode is connected in series with the filter capacitor and then connected with an output end of the double tube structure; the filter capacitor is an output end of the DCDC converter; and preferably, a coupling inductance structure unit is provided, and a coupling inductance and double tube boost conversion mode is formed. According to the high-gain DCDC converter, a boost ratio can be increased to a higher level, so that the defect of the traditional Boost circuit used for the photovoltaic inverter is overcome, and the high-gain DCDC converter has the advantages that the high-gain DCDC converter is high in boost gain, small in size, and high in conversion efficiency, and the voltage stress of the main power switch tube is low.
Description
technical field [0001] The invention relates to a DC / DC converter, in particular to a high-gain DC / DC converter used in the MPPT link of a photovoltaic inverter. Background technique [0002] At present, the development and application of distributed photovoltaic power generation has become one of the most effective new energy application methods. Distributed photovoltaic power generation systems usually include photovoltaic panels and off-grid photovoltaic inverters, among which photovoltaic inverters are the main technical link to convert direct current output from photovoltaic cells into alternating current. A general photovoltaic inverter includes a maximum power tracking (MPPT) link and a direct current-alternating current (DC / AC) inverter link. Due to the low voltage of the battery panel unit, in order to meet the needs of the subsequent DC / AC inverter, the front-stage MPPT usually needs to use a high-gain DC-DC (DC / DC) converter to greatly increase the DC voltage lev...
Claims
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IPC IPC(8): H02M3/155
Inventor 蔡鹏王小峰杨树汤雨
Owner 江苏博纬新能源科技有限公司