Device and method for predictive control of grid-connected inverter without alternating-current voltage sensor
A predictive control, AC voltage technology, applied in the output power conversion device, AC network to reduce harmonics/ripple, AC power input conversion to DC power output and other directions, can solve the low frequency disturbance estimation ability error, control effect is limited Harmonic influence is large, not considered, etc., to achieve the effect of rapid predictive control, accurate observation of grid voltage phase, and improved strength
Active Publication Date: 2022-06-24
HUAZHONG UNIV OF SCI & TECH
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[0005] Because the disturbance observed by the observer is mainly low-frequency disturbance, the accuracy directly affects the accuracy of grid connection, but its traditional structure still has a certain error in the estimation ability of low-frequency disturbance, and its current control strategy does not consider the 6k (k is a positive integer) sub-harmonic, so its control effect is greatly affected by harmonics
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[0048] In order to make the objectives, technical solutions and advantages of the present invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention, but not to limit the present invention. In addition, the technical features involved in the various embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.
[0049] The terms "first", "second" and the like in the description and claims of the present application and the above drawings are used to distinguish different objects, rather than to describe a specific order. Furthermore, the terms "comprising" and "having" and any variations thereof are intended to cover non-exclusive inclusion. For example, a process, method, system, product or device compris...
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The invention discloses a grid-connected inverter prediction control device and method without an alternating-current voltage sensor. The device comprises a coordinate conversion module, a coordinate transformation module, a voltage reconstruction module, a repetitive expansion state observer, a phase locking module, a prediction control module and a PWM (Pulse Width Modulation) module, compared with a traditional structure, an estimation channel for current and an estimation channel for interference in the repetitive expansion state observer are improved. Compared with the prior art, the expansion state observer has a better observation effect on disturbance at a low frequency band, the power grid voltage can be observed more accurately, the high-frequency disturbance suppression capability is enhanced, and the current instruction tracking performance is improved.
Description
technical field [0001] The present application relates to the technical field of grid-connected inverters, and more particularly, to a device and method for predictive control of grid-connected inverters without an AC voltage sensor. Background technique [0002] The grid-connected inverter is used to convert DC power into AC power. It is the last stage of power conversion equipment for grid-connected distributed generation systems, and plays a key role in the control of grid-connected power. [0003] The traditional controller needs to be equipped with a DC voltage sensor, an AC voltage sensor and an AC current sensor when controlling the grid-connected current. Many sensors increase the cost of the system and affect the reliability of the system. At the same time, it is necessary to adopt various control strategies to solve the problems of network pressure disturbance, variable coupling, model parameter deviation, etc., which not only increases the difficulty and complexit...
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IPC IPC(8): H02J3/38H02J3/01H02M7/5387
CPCH02J3/38H02J3/01H02M7/5387
Inventor 杨凯徐智杰郑逸飞杨帆黄煜昊李孺涵王翼龙泽扬
Owner HUAZHONG UNIV OF SCI & TECH