A Method of Optimizing Parameters of IPT System Based on Frequency Bifurcation Characteristics

Abstract

The invention provides a frequency bifurcation characteristic based inductive power transfer (IPT) system parameter optimization method. According to the method, a primary side compensation capacitance initial value is obtained through an alternating current impedance analysis method, then, a primary side compensation capacitance optimization value Cp is obtained according to iterative operation and computer simulation, and an IPT system soft switch frequency bifurcation graph is a standard furcation bifurcation graph, namely, a frequency invariant zone exists. Therefore, as long as the load RL of the IPT system is guaranteed not to exceed the load range in the frequency invariant zone, the soft switch frequency of the IPT system can be guaranteed to be invariant. The optimization method is simple, direct and effective, and can rapidly acquire the primary side compensation capacitance optimization value Cp.

Description

Technical field [0001] The invention relates to the field of inductive power transmission (IPT), in particular to an IPT system parameter optimization method based on frequency bifurcation characteristics. Background technique [0002] Inductive power transmission technology, referred to as IPT technology for short, is based on the principle of electromagnetic field near-field loose coupling induction, comprehensively using power electronic conversion technology, magnetic field coupling technology, and control theory to realize that electrical equipment obtains energy from the grid in a non-wire contact manner. The technology is widely used in the fields of urban electrified rail transit, pure electric vehicles, flammable and explosive special environment mobile electrical equipment, new energy power generation, oil drilling, tailless home appliances, and biological plant electrical equipment. [0003] Such as figure 1 As shown, from the system structure, the IPT system includes tw...

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Problems solved by technology

However, floating frequency control also has some limitations: the structure is relatively complex, and detection, transmission and control links are required, which reduces the reliability of the system; it cannot work at an unstable soft switching point, and frequency jumps may occur in the frequency bifurcation area change; the response speed of the control circuit is relatively high, and if there is a delay, the system will work in a hard switching state; if it is detuned, it may cause great damage to the system, so it is generally used in systems with low power

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