Working direction smooth switching control method for bidirectional resonant CLLC circuit

Abstract

The invention provides a working direction smooth switching control method for a bidirectional resonant CLLC circuit, comprising the following steps that 1, a controller detects a current circuit state and controls the bidirectional resonant CLLC circuit to operate in a forward working state by a primary-side bridge and a secondary-side bridge; 2, when an externally transmitted reference signal ora reference signal preset in the controller received by the controller is a working direction switching signal, the step 3 is executed; 3, the controller performs frequency conversion control; 4, thecontroller performs a phase shift control preparation operation, and generates a driving signal of the secondary-side bridge; and 5, the controller performs phase shift control; and 6, the circuit working state is switched to a reverse working mode. The control method of the invention combines the frequency conversion control and the phase shift control to realize, without using additional hardware, a function of switching the working direction of the bidirectional resonant CLLC circuit which cannot be realized by the conventional frequency conversion control.

Description

technical field [0001] The invention relates to a control method for smooth switching of working directions applied to a bidirectional resonant CLLC circuit, relates to the operation mode control of a bidirectional resonant CLLC circuit, belongs to the application field of DCDC converters, involves bidirectional flow of electric energy, and involves multiple application occasions at the same time , especially the dispatch management of energy storage equipment, belongs to the field of electric power industry. Background technique [0002] Energy Internet is the future development trend of the power industry. Large-scale centralized new energy power generation, distributed power generation, power grid frequency modulation services, and micro-grid technology are developing rapidly, and the demand for energy storage equipment is huge. Adding energy storage equipment to the power system can stabilize the volatility caused by large-scale new energy generation connected to the gri...

AI Technical Summary

Problems solved by technology

At present, in some occasions that require fast and stable switching of the working direction, such as energy storage equipment scheduling, electric vehicle V2G technology, and energy feedback, only bidirectional active bridge circuits can be used.

However, the traditional two-way resonant CLLC circuit cannot realize the smooth switching of the working direction of the circuit, which restricts its application in these occasions.

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