An Optimal Method for Voltage and Current Dual-loop Control Applied to Bidirectional Converter
A bidirectional converter, dual-loop control technology, applied in the direction of conversion equipment without intermediate conversion to AC, can solve problems such as limited voltage regulation capability, voltage loop error accumulation, system instability, etc., to prevent voltage collapse and prevent output reference. effect of current
Active Publication Date: 2017-09-22
STATE GRID HENAN ELECTRIC POWER ELECTRIC POWER SCI RES INST +2
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Problems solved by technology
[0005] However, in the parallel system experiment of two or more converters, it is found that when the converter with constant current operation is connected, the output voltage of the voltage loop cannot perfectly track the command voltage due to the limited duty cycle itself, which leads to The accumulation of errors in the voltage loop, and the accumulation of errors cannot be eliminated by adjusting the duty cycle, causing the system to become seriously unstable or out of control, which in turn leads to system instability, and even reverse operation of the bidirectional converter, causing the DC bus voltage to collapse
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[0032] like figure 1 As shown, the optimization method applied to the voltage and current double-loop control of the bidirectional converter limits the integral link of the voltage and current loop through the limiting of the PI regulator, thus ensuring the stability of the system. The system is composed of two DC / DC converters connected in parallel, one of which is a unidirectional buck converter, which is used as a new energy battery interface, and is kept in a constant current working mode by a single current closed-loop control method. The control block diagram is as follows figure 2 Shown; the other is a bidirectional converter, which can realize bidirectional power flow.
[0033] The traditional double-loop control control block diagram is as follows: image 3 Shown: The output voltage v of the converter bus and given value voltage reference value v ref In comparison, the voltage error is amplified by the voltage regulator to generate the reference current i ref (t)...
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The invention discloses a voltage and current double-loop control optimization method for a bidirectional converter. The inhibition of the error amplitudes of a voltage loop and a current loop effectively avoids system instability caused by the improper output, caused by the error accumulation, of a reference current and a duty ratio. The method is simple in implementation, is convenient to implement, and greatly improves the system stability.
Description
technical field [0001] The invention relates to the control of bidirectional converters, in particular to an optimization method for double-loop control of voltage and current applied to bidirectional converters. Background technique [0002] In recent years, switching power regulators have been developed into lightweight, high-efficiency DC power supplies. Among various types of DC-DC switching converters, the PWM type DC-DC converter has many types of structures, rapid development, advanced technology, and easy implementation, forming the largest category. [0003] The traditional single-voltage loop control only samples the output voltage as a feedback signal to realize closed-loop control. It is characterized by simple control and easy implementation. However, in the transient process, the output voltage amplitude fluctuates greatly, which may easily cause system instability. The state-space averaging method solves the analysis problems of steady-state and dynamic low...
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IPC IPC(8): H02M3/04
Inventor 刘书铭唐钰政张博朱明丽王忠强代双寅李琼林李尚盛孙建军查晓明
Owner STATE GRID HENAN ELECTRIC POWER ELECTRIC POWER SCI RES INST