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MPC control method for single-phase cascaded rectifiers for DC microgrids

A DC microgrid and control method technology, applied in the field of power electronics, can solve the problems of large calculation amount of algorithm and complex control structure, and achieve the effect of eliminating double fundamental frequency fluctuation, speeding up dynamic recovery process, and fixing switching frequency

Active Publication Date: 2021-05-11
ZHEJIANG UNIV +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The control structure of these MPC control strategies is complex, the algorithm has a large amount of calculation, and it also involves the selection and design of the cost function. The circuit control effect is often directly related to the cost function.

Method used

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  • MPC control method for single-phase cascaded rectifiers for DC microgrids
  • MPC control method for single-phase cascaded rectifiers for DC microgrids
  • MPC control method for single-phase cascaded rectifiers for DC microgrids

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Embodiment Construction

[0035]The present invention provides a new MPC control method suitable for a single-phase cascade of a DC microgrid, the control method comprising the steps of:

[0036](1) Enter voltage in monochao level linkages(k), input current Is(k), intermediate capacitor voltage U2(k), post-stage inductor current IL2(k), output voltage uDC (k), output current IDC (k) perform real-time sampling, where k indicates the sampling time.

[0037](2) Real-time computing circuit load r0, The duty cycle of the stage BUCK circuit switch tube2And single-phase PWM rectifier switch tube PWM modulation duty cycle NAB :

[0038]R0= UDC (k) / iDC (k)

[0039]

[0040]

[0041]among them,2Inspiration for BUCK circuitry,Indicate the inductor current IL2Reference value, TsIndicates the control period, R is the alternating side equivalent resistance, and L is an alternating side inductor, IS_ref Indicates that the input current IsReference value. Among them, NQB = Ma-Mb, Ma, MbSwitching function for the front-level rectifier bridg...

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Abstract

The invention discloses a novel MPC control method suitable for a single-phase cascaded rectifier of a DC microgrid. The front stage of the main circuit of the cascaded rectifier is a single-phase PWM rectifier, and the rear stage is a Buck circuit. The control method adopts model predictive control The idea of ​​predicting the key circuit parameters according to the mathematical model of the circuit switching cycle, abandoning the calculation of the cost function, directly calculating the duty cycle of the switching tube according to the control target, and realizing the fixed frequency control of the switching tube in combination with PWM; the present invention adopts a two-stage circuit structure, breaking through It overcomes the limitation of single-stage circuit, solves the contradiction between transient state and steady-state regulation of single-phase rectifier circuit when the load changes suddenly, and eliminates the double fundamental frequency fluctuation of the outlet voltage of single-phase PWM rectifier. At the same time, a new model predictive control method is adopted, which simplifies the calculation amount of the algorithm and reduces the calculation cost of the circuit control chip. The circuit structure of the invention is simple, and the control algorithm is simple and convenient, so that the outlet voltage can quickly recover when the circuit has a sudden load change, and the quality of the outlet voltage of the rectifier is significantly improved.

Description

Technical field[0001]The present invention relates to the field of power electronics, and more particularly to a new MPC (Model Predictive Control, MPC) control method suitable for single-phase cascading of DC microgrid.Background technique[0002]In recent years, with the proposal of "micro-grid" concept and the development of Clean energy power generation technology such as photovoltaic power generation, wind power generation, DC microgrid has been vigorously developed. At present, the research focuses on DC microgd grid at home and abroad focus on the voltage control, protection and distributed power management of the system, less research on the quality of micro-grid electric energy. With the development of industrial technology, the requirements of power quality become higher and higher. In order to provide users with high quality DC power and develop DC power supply technology, the actual project is promoted, and the DC converter circuit and its control technical significance ar...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M7/219H02M3/156H02J1/10
CPCH02J1/10H02M3/156H02M7/219H02M1/007H02M3/1566
Inventor 雷叶爽刘海涛陈庆杨鹏程熊雄季宇于淼司鑫尧肖小龙
Owner ZHEJIANG UNIV