MPC control method for dual-stage boost converter for DC microgrid
A technology of DC microgrid and control method, which is applied in the direction of converting DC power input to DC power output, parallel operation of DC power supply, adjusting electrical variables, etc. Achieve the effect of fixing the switching frequency, reducing the outlet voltage drop, and speeding up the dynamic recovery process
Active Publication Date: 2021-08-10
ZHEJIANG UNIV +2
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But similarly, this type of algorithm also has the problems of complex control structure, slow dynamic process, and time-consuming parameter setting.
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[0030] The present invention provides a novel MPC control method suitable for a single-phase cascaded rectifier of a DC microgrid. The control method includes the following steps:
[0031] (1) For the input voltage u in the two-stage Boost converter s (k), input current i s (k), intermediate stage capacitor voltage u 2 (k), the post-stage inductor current i L2 (k), output voltage u dc (k), output current i dc (k) Perform real-time sampling, where k represents the sampling moment.
[0032] (2) Real-time calculation of the circuit load R and the duty cycle n of the switch tube of the subsequent Boost circuit 2 and the duty cycle n of the switch tube of the pre-stage Boost circuit 1 :
[0033] R=u dc (k) / i dc (k)
[0034]
[0035]
[0036] Among them, C 2 is the output side capacitance of the subsequent Boost circuit, u dc_ref Indicates the outlet voltage u at time k dc Reference value, T s Indicates the control period, L 1 is the inductance of the pre-stage ...
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The invention discloses a novel MPC control method for a dual-stage Boost converter suitable for a DC microgrid. The main circuit of the dual-stage Boost converter is composed of two Boost circuits cascaded. The control method first samples the dual-stage Boost converter in real time. The input voltage and current in the converter, the capacitor voltage of the intermediate stage, the inductor current of the rear stage, and the output voltage and current. Then calculate the circuit load in real time, the duty cycle of the switching tube of the rear stage Boost circuit and the duty cycle of the switching tube of the previous stage Boost circuit; finally the switching function obtained by calculation is sent to the PWM wave modulation module, and the modulation module is based on the switching function The corresponding switching tube PWM wave switching signal is modulated to complete the control of the two-stage Boost converter. The invention has a simple circuit structure, effectively improves the voltage boosting ratio of the circuit, and has a simple and convenient control algorithm, so that the outlet voltage can quickly recover when the circuit has a sudden load change, and the outlet voltage quality of the converter is significantly improved.
Description
technical field [0001] The present invention relates to the technical field of power electronics, in particular to a novel MPC (Model Predictive Control, MPC) control method suitable for a two-stage Boost of a DC microgrid. Background technique [0002] In recent years, with the introduction of the concept of "microgrid" and the development of clean energy power generation technologies such as photovoltaic power generation and wind power generation, DC microgrids have been vigorously developed. At present, domestic and foreign research on DC microgrids mainly focuses on the voltage control, protection and distributed power management of the system, and there are few studies on the power quality of microgrids. With the development of industrial technology, the requirements for power quality are getting higher and higher. In order to provide users with high-quality DC power, develop DC power supply technology, and popularize practical projects, it is of great significance to ...
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IPC IPC(8): H02M3/156H02J1/10
CPCH02J1/10H02M3/156H02M1/007H02M3/1566
Inventor 陆玲霞刘海涛陈庆杨鹏程雷叶爽熊雄于淼季宇司鑫尧肖小龙
Owner ZHEJIANG UNIV