An apfc control system for online estimation of control rate
A control system and estimation control technology, which can be used in output power conversion devices, climate sustainability, high-efficiency power electronic conversion, etc. vibration, improved robustness, and improved system performance
Active Publication Date: 2020-05-26
HUAIYIN INSTITUTE OF TECHNOLOGY
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Problems solved by technology
[0004] The invention provides an APFC control system for online estimation of the control rate. The invention effectively solves the problem that the traditional sliding mode control of the existing DC-DC converter causes the sliding mode surface function to approach zero and the convergence speed is relatively slow, and The problem that the sliding process may be uncontrollable in the case of system interference
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[0043] The present invention will be further described below in conjunction with the drawings. The following embodiments are only used to illustrate the technical solutions of the present invention more clearly, and cannot be used to limit the protection scope of the present invention.
[0044] Such as figure 1 Said, Boost APFC main circuit topology and current path:
[0045] The main circuit adopts Boost APFC topology structure, which is composed of single-phase bridge uncontrolled rectifier and DC-DC Boost converter, including input capacitor C 1 , Boost inductor L, switch tube T, diode D, output capacitor C o And load R. v in =V s ·|sinωt| is the output voltage of the uncontrolled rectifier bridge, V s Is the peak value of the grid voltage;
[0046] r L Is the equivalent resistance of the inductor, i L Is the inductor current, v o Is the DC output voltage;
[0047] When the switch tube T is turned on, the inductor L stores energy and the capacitor C o To supply power to the load...
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The invention discloses an APFC control system for online estimation of control rate, which comprises a Boost APFC main circuit and a sliding mode control circuit. The inductor current and output voltage collected by the circuit are controlled to realize power factor correction and obtain a smooth and stable output voltage. The sliding mode control circuit includes a voltage outer loop PI control module, a sliding mode controller, a PWM comparator and a driving circuit module; wherein said sliding mode controller comprises a sliding mode surface module, an RBF neural network algorithm module, a genetic algorithm module, and a sliding mode control module; the present invention effectively solves the problem that existing DC-DC converters adopt traditional sliding mode control, resulting The convergence speed of the sliding mode surface function approaching zero is slow, and the sliding process may not be completed when the system is disturbed.
Description
Technical field [0001] The present invention relates to the technical field of power control equipment, in particular to an APFC control system for online estimation of control rate. Background technique [0002] AC / DC converters in electric vehicle charging devices mostly use boosted active power factor correction (BoostAPFC) circuits. After the AC input power is rectified and filtered, the input current contains a large number of harmonic components, which makes the input current distorted. The factor is low. [0003] The APFC circuit contains non-linear components, which makes it difficult for traditional linear control methods to achieve satisfactory control results, and the influence of system parameter disturbances is not considered. Sliding mode control (SMC) can continuously adjust the control amount to make the system state reach the set sliding mode surface and move along the trajectory, which can realize the effective control of nonlinear systems, and has been successfu...
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IPC IPC(8): H02M1/42
CPCH02M1/4225H02M1/0003Y02B70/10
Inventor 倪伟陈语嫣王业琴唐中一夏奥运郭畅刘璐王星月
Owner HUAIYIN INSTITUTE OF TECHNOLOGY