Photovoltaic inverter system, photovoltaic inverter and resonance suppression method and device thereof
A photovoltaic inverter and resonance suppression technology, which is applied in harmonic reduction devices, photovoltaic power generation, output power conversion devices, etc., can solve the problems of wasting resources and increasing costs, and achieve the effect of saving costs.
Active Publication Date: 2018-04-17
深圳市英威腾光伏科技有限公司
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[0005] In view of this, the present invention provides a photovoltaic inverter system, a photovoltaic inverter and its resonance suppression method and device to solve the problem of suppressing parallel resonance at the cost of increasing costs and wasting resources in the prior art
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[0038] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.
[0039] The invention provides a resonance suppression method for photovoltaic inverters, which is applied to a host computer connected to M parallel photovoltaic inverters to solve the problem of suppressing parallel resonance at the cost of increasing costs and wasting resources in the prior art .
[0040] Specifically, such as figure 1 As shown, the resonance suppression methods of photovoltaic inverters include:
[0041] S101. When the common coupling poi...
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The present invention discloses a photovoltaic inverter system, a photovoltaic inverter and a resonance damping method and device thereof. When resonance oscillation occurs at a point of common coupling (PCC) of M photovoltaic inverters in parallel connection, N photovoltaic inverters are selected by an upper computer to switch to a resonance damping function and are enabled to generate comprehensive instruction current according to resonance voltage and resonance current of the PCC and bus voltage thereof, so as to carry out tracking compensation on resonance current of a power grid, thereby realizing suppression of the resonance vibrations; and other M-N photovoltaic inverters are still at a normal grid connection working state, thereby ensuring normal operation of photovoltaic grid connection. The resonance damping method of the photovoltaic inverters requires no extra active power filter (APF) devices, saves cost of photovoltaic power stations, and does not cause resource wastes when the resonance vibrations do not occur, thereby solving the problem of parallel resonance suppression at the cost of cost increase and resource wastes.
Description
technical field [0001] The invention relates to the technical field of photovoltaic inverter resonance suppression, in particular to a photovoltaic inverter system, a photovoltaic inverter, and a resonance suppression method and device thereof. Background technique [0002] With the continuous increase of photovoltaic power generation capacity, in order to increase the reliability and scalability of the system, M inverters are often connected to the power grid in a non-isolated transformer parallel mode, which is likely to cause a single grid connection in the photovoltaic power station system. The grid equivalent impedance borne by the inverter gradually increases, and the interaction between the grid impedance and the photovoltaic power station system may cause the grid-connected current to resonate at certain frequencies, which seriously distorts the grid-connected current and deteriorates the output power quality, even It will affect the stability of the entire photovolt...
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IPC IPC(8): H02M7/48H02M1/12H02J3/01H02J3/38
CPCY02E10/56Y02E40/40
Inventor 姜碧光汤键
Owner 深圳市英威腾光伏科技有限公司