Control method of three-phase PWM rectifier based on system online identification
A control method and rectifier technology, applied in the direction of output power conversion device, AC power input conversion to DC power output, electrical components, etc., can solve the problem of reducing the steady-state performance of three-phase PWM rectifiers, reducing the dynamic performance of three-phase PWM rectifiers, etc. problem, achieve the effect of solving the parameter mismatch problem, simple structure, and good identification effect
Inactive Publication Date: 2019-05-28
HARBIN UNIV OF SCI & TECH
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Problems solved by technology
[0009] Although the model predictive control strategy can obtain a fast dynamic response through the optimal control action, the control strategy requires the mathematical model to be strictly consistent with the controlled object, and is susceptible to adverse effects such as model mismatch and parameter changes.
The parameter mismatch of the inductor will generate reactive power and reduce the steady-state performance of the three-phase PWM rectifier; the parameter mismatch of the equivalent resistance will generate additional active power and reduce the dynamic performance of the three-phase PWM rectifier
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[0041] This embodiment will be further described in conjunction with the accompanying drawings.
[0042] Step 1, as attached figure 1 As shown in the topology of the three-phase PWM rectifier, the three-phase input AC side voltage u is collected a , u b , u c , AC side current i a i b i c ;
[0043] Step 2. Establish the mathematical model of the PWM rectifier in the three-phase stationary coordinate system according to KCL and KVL, the expression is as follows:
[0044]
[0045] where u sa , u sb , u sc is the voltage at the input terminal of the rectifier, L is the inductance of the bridge arm side, and R is the equivalent resistance;
[0046] Utilize the phase-locked loop PLL to obtain the current phase θ=ωt of the grid voltage, where ω represents the power frequency rotation angular velocity of the grid;
[0047] The above formula can be written as
[0048] and
[0049] also because
[0050] so
[0051] so In the above formula where θ=ωt, so der...
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The invention discloses a three-phase PWM rectifier control method based on system online identification, and belongs to the field of three-phase two-level PWM rectifier control. The method is based on a three-phase voltage source type PWM rectifier mathematical model. A model prediction function is established, a performance index function is solved, a deterministic model gradient algorithm principle is analyzed, a three-phase PWM rectifier parameter online identification algorithm is derived, a power control strategy based on parameter estimation is provided, real-time correction of circuitmajor loop parameters is achieved, and then control over the three-phase PWM rectifier is completed. The method retains the advantages of a three-phase PWM rectifier model prediction direct power control strategy, and is good in system stability and high in anti-interference capability.
Description
technical field [0001] A control method for a three-phase PWM rectifier, in particular to a control method for a three-phase PWM rectifier based on system online identification. Background technique [0002] The amount of data transferred between electronic devices has grown tremendously over the past few years. Large amounts of audio, streaming media, text, and other types of data content are routinely transferred between desktop and laptop computers, media devices, handheld media devices, displays, storage devices, and other types of electronic devices. Power can be transmitted together with this data, or power can be transmitted separately. [0003] Power and data may be transmitted through cables, which may include wire conductors, fiber optic cables, or some combination of these or other conductors. Cable assemblies may include connector inserts at each end of the cable, but other cable assemblies may be connected or tethered to electronic devices in specialized ways....
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Inventor 吕艳玲王硕冯成宇高玉婷杜怡志毕圣煦
Owner HARBIN UNIV OF SCI & TECH