BD-WPT system power coordination control method based on PI controller optimization

Abstract

The invention relates to a BD-WPT system power coordination control method based on PI controller optimization, and the method specifically comprises the following steps: 1) controlling a primary sideinverter circuit to generate a constant voltage, and keeping a phase angle and a phase shift angle of the primary side inverter circuit unchanged; 2) taking the output power of the secondary side asan output variable, comparing the output power with a corresponding reference value, providing a comparison error for the optimized PI controller, and obtaining PI controller parameters in combinationwith a classical ZN setting method and a particle swarm intelligence algorithm; 3) generating a phase shift amount which should be generated by the secondary side output voltage of the system throughan amplitude limiting link, a gain link and the like, and adjusting the phase shift amount of the secondary side inverter output voltage of the system to be equal to the value; 4) comparing the output power of the system with the reference value again, and adjusting the actual phase shift amount to be equal to the value; and (5) repeating the steps (3) and (4) on the premise of ensuring that thephase difference between the output voltages of the inverters on the secondary side and the primary side of the system is fixed to be + / -90 degrees, and after a certain response time, ensuring that the system output tends to be stable.

Description

technical field [0001] The invention relates to a control method, in particular to a BD-WPT system power coordination control method based on PI controller optimization, and belongs to the technical field of circuit output control of a two-way wireless power transmission system. Background technique [0002] Wireless Power Transfer (WPT) is a technology that enables energy transfer without traditional physical connections. This technology transmits energy through special methods such as magnetic fields, effectively avoiding the problems of line wear and leakage when charging with traditional piles. Judging from the current research results, high-efficiency transmission of various power levels can be achieved in long-distance or short-distance applications. In addition, because wireless power transfer technology does not require a human-made physical interface, it also has better flexibility, convenience and safety when charging compared to traditional charging methods. Acc...

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Problems solved by technology

At this time, it is necessary to establish a corresponding communication channel in the system, or design a more complex algorithm to ensure the successful realization of the energy flow control scheme realized by the "phase-shifting voltage regulation method"; this will greatly increase the difficulty of the design of the system And complexity, but also bring some new problems, such as the introduction of communication channels may be interfered by the high-frequency energy transmission process, and at the same time will cause the stability of the system to decline

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