Novel MPC control method suitable for two-stage Boost converter of direct-current 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, and adjusting electric variables, etc., can solve the problems of slow dynamic process, long parameter setting time, complicated control structure, etc. Achieve the effect of reducing the outlet voltage drop, fixing the switching frequency, and speeding up the dynamic recovery process
Active Publication Date: 2020-09-25
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 for a single-phase cascaded rectifier suitable for 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), the intermediate capacitor voltage u 2 (k), the subsequent inductor current i L2 (k), output voltage u dc (k), output current i dc (k) Real-time sampling, where k represents the sampling time.
[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 ratio n of the switch tube of the previous Boost circuit 1 :
[0033] R=u dc (k) / i dc (k)
[0034]
[0035]
[0036] Where 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 Represents the control cycle, L 1 Is the inductance of the previous Boost circuit, i s_ref Represents the input curre...
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The invention discloses a novel MPC control method suitable for a two-stage Boost converter of a direct-current microgrid. A main circuit of the two-stage Boost converter is formed by cascading two Boost circuits. The control method comprises the following steps of: sampling input voltage, input current, intermediate-stage capacitor voltage, rear-stage inductor current, output voltage and output current in the two-stage Boost converter in real time; calculating a circuit load, a duty ratio of a rear-stage Boost circuit switching tube and a duty ratio of a front-stage Boost circuit switching tube in real time; and sending a calculated switching function to a PWM wave modulation module, and enabling the modulation module to modulate a corresponding switching tube PWM wave switching signal according to the switching function to complete the control of the two-stage Boost converter. The structure of the circuit is simple; the boost transformation ratio of the circuit is effectively improved; the control algorithm is simple and convenient; the outlet voltage can be quickly recovered when the load of the circuit suddenly changes; and the outlet voltage quality of the converter is remarkably improved.
Description
Technical field [0001] The invention relates to the technical field of power electronics, and 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 microgrid has been vigorously developed. At present, the research focus on DC microgrid at home and abroad is mainly concentrated on the voltage control, protection and distributed power management of the system, and there is little research on the power quality of microgrid. With the development of industrial technology, the requirements for power quality have become higher and higher. In order to provide users with high-quality DC power, develop DC power supply technology, and promote practical engineering, it is of great significan...
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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