A photovoltaic inverter and corresponding switching frequency control method
A photovoltaic inverter and switching frequency technology, applied in the photovoltaic field, can solve problems such as inverter overcurrent or overvoltage shutdown, output current grid-connected port voltage oscillation, inverter damage, etc., to improve conversion efficiency and ensure The effect of grid stability
Active Publication Date: 2022-06-28
HUAWEI DIGITAL POWER TECH CO LTD
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Problems solved by technology
At present, most photovoltaic inverters use LCL filters as grid-connected filters, and LCL filters have resonance peaks. If the switching frequency of photovoltaic inverters is not properly coordinated with LCL parameters, it may cause output current and grid-connected port voltage to oscillate. Cause the inverter to shut down due to overcurrent or overvoltage, and even cause damage to the inverter in severe cases
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[0064] The embodiments of the present application will be described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Those of ordinary skill in the art know that with the development of technology and the emergence of new scenarios, the technical solutions provided in the embodiments of the present application are also applicable to similar technical problems.
[0065] The terms "first", "second" and the like in the description and claims of the present application and the above drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It is to be understood that data so used may be interchanged under appropriate circumstances so that the embodiments described herein can be practiced in sequences other than those illustrated or described herein. Furthermore, the terms "comprising" a...
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The application discloses a photovoltaic inverter, including: an inverter circuit, a data sampling module and a control module. The inverter circuit includes a switching device and an AC outlet terminal. The instantaneous value of the current at the sampling point and the instantaneous value of the current of each phase at the target time, the control module is used to determine the effective value of the current for the target sampling time according to the instantaneous value of the current at each sampling point, and determine the Nth switching cycle according to the effective value of the current The upper limit of the switching frequency and the lower limit of the switching frequency, and the instantaneous value of the target current I is determined according to the instantaneous value of the current of each phase at the target time N ;According to the instantaneous value of the target current I N , switching frequency upper limit F NU and switching frequency lower limit F ND , to determine the target switching frequency f for the Nth switching cycle N , and then use f N control switching device. In this way, the conversion efficiency of the photovoltaic inverter can be improved on the premise of ensuring grid-connected stability.
Description
technical field [0001] The present application relates to the field of photovoltaic technology, in particular to a photovoltaic inverter and a corresponding switching frequency control method. Background technique [0002] As a renewable and clean energy, photovoltaic power generation industry has developed rapidly in recent years. A photovoltaic power generation system includes multiple components such as photovoltaic modules, photovoltaic inverters, transformers and cables. The photovoltaic inverter is the core component of the energy conversion of the photovoltaic power generation system, which plays the role of converting the DC power output by the photovoltaic modules into the grid usable. The role of alternating current. The conversion efficiency of a photovoltaic inverter refers to the percentage of its output power to its input power. Under the premise of the same input power, the higher the conversion efficiency of the photovoltaic inverter, the higher the output ...
Claims
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IPC IPC(8): H02J3/38H02M7/48
CPCH02J3/383H02M7/48Y02E10/56H02M1/007H02M3/00H02M7/42H02J2300/24H02J3/381H02J1/102H02S40/32H02J2300/26H02J3/46H02M7/539H02M1/0054
Inventor 于心宇辛凯
Owner HUAWEI DIGITAL POWER TECH CO LTD