A control method for a two-phase three-wire inverter
A control method and inverter technology, applied in the field of power electronics, can solve problems such as few inverters, and achieve the effect of fast load change and fast response
Active Publication Date: 2021-12-07
赛万特系统公司
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Problems solved by technology
North American household distribution network voltage widely adopts two-phase three-wire type, that is, it is composed of two live wires and neutral wires with a phase difference of 180°, and the current domestic inverters are mainly divided into single-phase inverters and three-phase inverters. There is an inverter matching the distribution network mode
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[0023] In order to facilitate the understanding of those skilled in the art, the present invention will be further described below in conjunction with the embodiments and accompanying drawings, and the contents mentioned in the embodiments are not intended to limit the present invention. The present invention will be described in detail below in conjunction with the accompanying drawings.
[0024] A control method for a two-phase three-wire inverter, comprising the following steps:
[0025] Step A, such as figure 1 It is the working schematic diagram of the phase locking module. After the grid voltage is sampled and processed, it is sent to the SPLL module, and the current grid phase information can be obtained; in view of the differences of the two inductors, drive circuits, power devices and the influence of the PWM dead zone, this embodiment is based on real-time Sampling voltage and current information to calculate the current actual power factor, calculate the phase offs...
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The present invention relates to the field of power electronics technology, in particular to a control method for a two-phase three-wire inverter, which includes the following steps: step A, sampling the grid voltage to obtain current grid phase information; real-time sampling voltage and current information calculation The current actual power factor, calculate the phase offset based on the calculated actual power factor and superimpose it into the phase information of the grid; at the same time increase the power factor setting, calculate the phase offset based on the power factor set by the user and superimpose it into the grid phase information; Synthesize the input source information of grid voltage, power factor and phase compensation, output locked phase information Sin / Cos, and output another grid voltage phase information NSin / NCos after phase conversion; the invention adopts automatic load power tracking and grid-connected power setting Combined current acquisition strategy; using orthogonal decomposition of inductor current, taking into account active current and reactive current control, to meet the needs of different working conditions.
Description
technical field [0001] The invention relates to the technical field of power electronics, in particular to a control method for a two-phase three-wire inverter. Background technique [0002] At present, power electronics technology is developing rapidly, and grid-connected inverter technology is becoming more and more perfect. Control technologies include P / Q, d / q, V / F, PI, fuzzy control, SVPWM, etc. For single-phase inverters and three-phase inverters, there are few available in the market for two-phase three-wire distribution networks in North America. North American household distribution network voltage widely adopts two-phase three-wire type, that is, it is composed of two live wires and neutral wires with a phase difference of 180°, and the current domestic inverters are mainly divided into single-phase inverters and three-phase inverters. There is an inverter matching the distribution network mode. Therefore, for the two-phase three-wire distribution network mode in...
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IPC IPC(8): H02J3/50H02J3/48
CPCH02J3/48H02J3/50
Inventor 刘鹏
Owner 赛万特系统公司