Feedforward strategy for suppressing inverter current harmonics caused by power grid harmonic voltage
A technology of grid voltage and harmonic voltage, which is applied in the direction of converting irreversible DC power input into AC power output, instruments, electrical components, etc.
Active Publication Date: 2021-02-23
NANJING UNIV OF SCI & TECH
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Problems solved by technology
[0005] In view of the above problems, the embodiment of the present invention provides a feed-forward strategy to suppress the inverter current harmonics caused by the harmonic voltage of the power grid. For the low-frequency harmonic current caused by the background harmonic voltage of the power grid, it is necessary to maintain its harmonic In order to solve the problem of suppressing the effect without increasing the complexity of the system structure, the Padé approximate improved grid voltage feed-forward control strategy is selected, which simplifies the control structure of the system and maintains the suppression effect on the background harmonic voltage of the grid
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[0033] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments It is a part of embodiments of the present invention, but not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without creative efforts fall within the protection scope of the present invention.
[0034] A feed-forward strategy for suppressing inverter current harmonics caused by grid harmonic voltages includes the following steps:
[0035] (1) Establish an equivalent model of the grid-connected inverter system with grid voltage feed-forward control;
[0036] (2) According to the system model, the functional relationship between the grid-s...
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The invention relates to the field of power electronics, and discloses a feedforward strategy for suppressing inverter current harmonics caused by power grid harmonic voltage, which comprises the following steps of: establishing a grid-connected inverter system equivalent model with power grid voltage feedforward control, obtaining a function relation between grid-side current and power grid voltage according to the system model, establishing a system power grid voltage full-feedforward module by utilizing the function relation between grid-side current and power grid voltage to eliminate theinfluence of power grid voltage, optimizing the power grid voltage full-feedforward module by adopting a Pade approximation theory under the condition of not reducing the harmonic suppression effect of a feedforward control structure on a power grid, and comparing and analyzing the suppression performance of different Pade approximations of the power grid voltage full-feedforward module on voltageharmonics to obtain an optimal feedforward control module. According to the feedforward strategy, Pade approximation is adopted to improve power grid voltage feedforward control, a very good suppression effect is achieved on power grid background harmonic voltage, the control structure of the system is simplified, and the realizability and practicability of the control system are improved.
Description
technical field [0001] The invention relates to a feedforward strategy for suppressing inverter current harmonics caused by grid harmonic voltages, belonging to the field of power electronics. Background technique [0002] Due to the increasing scarcity of traditional energy, new energy technologies have gradually entered everyone's field of vision and have been widely developed and applied. Photovoltaic power generation is one of the most widely used, as an energy conversion interface between photovoltaic power generation units and the grid. The performance improvement of grid-connected inverters has received a lot of attention. [0003] In the grid-connected inverter, the power equipment connected to the grid side and the grid will cause the background harmonic voltage of the grid to be generated at the common coupling point, thereby causing the harmonic current of the inverter. This part of low-frequency harmonics is different from the high-frequency harmonics generated b...
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Login to View More IPC IPC(8): H02M1/12H02M1/088H02M7/44G06F30/20G06F113/04
CPCG06F30/20G06F2113/04H02M1/088H02M1/12H02M7/44
Inventor 刘晋宏倪景
Owner NANJING UNIV OF SCI & TECH