LCL filtering-based RBFNN segmentation online optimization passive control system and method

Abstract

The invention proposes an LCL filtering-based RBFNN segmentation online optimization passive control system and method. Grid-side three-phase voltage and current signals are acquired through three-phase voltage and current signal sensors respectively, and coordinate transformation is performed; a passive control Hamiltonian model based on an IDA-PBC algorithm is built according to coordinate axisvoltage and current, and improved d,q-axis switching function is built; particles containing parameters such as an RBFNN learning rate and a momentum factor under different load resistances are subjected to offline optimization through PSO to obtain an optimal particle set; the load resistances calculated by DC-side voltage and current sensor signals are used as segmentation triggering conditions,an RBF-PID model is built through the optimal particle, and a controller model is used to realize segmentation optimization control; the RBF-PID after parameter optimization is used for optimal solution for stably-operating Im; and according to the optimized Im and in combination of the d,q-axis switching function, control is carried out, IGBT control signals are generated by SVPWM, and rectification control is realized. The control precision is higher, and the robustness is better.

Description

technical field [0001] The invention belongs to the field of power electronics and nonlinear control, and in particular relates to an RBFNN subsection online optimization passive control system and method based on LCL filtering. Background technique [0002] With the development of power control technology, the LCL-filtered Voltage Source PWM Rectifier (Voltage Source PWM Rectifier, VSR), that is, LCL-VSR, has a better filtering effect on high-order harmonics, not only the switching frequency is low, the inductance The value is small, and at the same time, it can effectively reduce the total harmonic distortion (Total Harmonic Distortion, THD) of the grid current waveform, and more and more researchers pay attention to it. [0003] Although the LCL filter can reduce the total harmonic distortion rate of the network current waveform, the introduction of the filter capacitor increases the resonance phenomenon, resulting in system instability. If the resonance phenomenon canno...

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Problems solved by technology

[0003] Although the LCL filter can reduce the total harmonic distortion rate of the network current waveform, the introduction of the filter capacitor increases the resonance phenomenon, resulting in system instability.

If the resonance phenomenon cannot be effectively solved, the THD will be further increased, and the content of high-order harmonics on the grid side will also further increase

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