Model prediction method, system and device with multi-level inverter and storage medium

A three-level inverter and model prediction technology, applied in the field of micro-grid, can solve the problems of large influence on the stable operation of the power grid, unsatisfactory control effect, short service life, etc., achieve fast transient response, maintain stable and efficient operation, Effect of High Stability Margin

Active Publication Date: 2021-02-19
SHAANXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to overcome the disadvantages of the traditional control method, such as short service life, complex design, great influence on the stable operation

Method used

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  • Model prediction method, system and device with multi-level inverter and storage medium
  • Model prediction method, system and device with multi-level inverter and storage medium
  • Model prediction method, system and device with multi-level inverter and storage medium

Examples

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Embodiment 1

[0051] see figure 1 , the model prediction system of the present invention includes a diode-clamped three-level inverter 1 and a control unit 2 . The control unit 2 includes a current measurement module, a voltage measurement module, a harmonic elimination module, a flexible reference current calculation module, a model predictive control algorithm module and a switch state application module. The current measurement module is used to extract the current value of the grid side; the voltage measurement module is used to extract the voltage value of the grid side; the harmonic elimination module is used to eliminate the positive sequence and negative sequence harmonic components of the measured voltage; flexible reference current The calculation module is used to generate the reference current required by the control system; the model predictive control algorithm module is used to track the reference current and balance the DC measured capacitor voltage; the switch state applica...

Embodiment 2

[0053] Except for the following content, all the other contents are the same as in Example 1.

[0054] Such as figure 1 As shown, the diode-clamped three-level inverter 1 includes a DC input voltage source, 2 input capacitors, 12 power switch tubes, 6 diodes, 3 filter inductors, 3 load resistors and a three-phase input on the grid side Voltage.

[0055] where the input capacitance C 1 One terminal with input capacitor C 2 The connection point is point O, and the other end is connected to the positive pole of the voltage source and the power switch tube S 1 , S 5 , S 9 collector, the input capacitor C 2 The other end is connected to the negative pole of the voltage source and the power switch tube S 4 , S 8 , S 12 The emitter of the power switch tube S 1 The emitter is connected to the power switch tube S 2 The collector of the power switch tube S 2 The emitter is connected to the power switch tube S 3 The collector of the power switch tube S 3 The emitter is conn...

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Abstract

The invention discloses a model prediction method, system and device with a multi-level inverter and a storage medium, and belongs to the technical field of micro-grids. A flexible reference current calculation module can provide unbalance and harmonic current required by a load, the reference current is calculated from each component of the power grid voltage, all the calculations are carried outin a static coordinate system, and a phase-locked loop is not required to be applied, so that the control method is simpler and easier to implement; and the model prediction control algorithm modulecan track multi-frequency reference current, does not need any modulation mode, not only can realize multi-target control, but also has faster transient response and higher stability margin. Under different micro-grid conditions, the control method can suppress active power oscillation of the system to a certain extent and maintain stable and efficient operation of the system, so that the model prediction system has certain universality and practicability.

Description

technical field [0001] The invention belongs to the technical field of micro-grids, and relates to a model prediction method, system, equipment and storage medium with a multi-level inverter. Background technique [0002] Due to the wide application of nonlinear loads, there are more and more unbalanced and distorted power grids. The operating conditions of these micro-grids will continue to change according to the load curve, which will cause active power oscillations, lead to voltage fluctuations on the DC side, and pollute the power grid. This will not only affect the service life of batteries and capacitors in the energy storage system, but also affect the stability of the system. Active power oscillations can only be reduced by reducing the harmonic distortion of the grid current. Therefore, in order to cope with various expected abnormal situations of the microgrid, it is necessary to study the applicable control algorithm to suppress the active power oscillation of t...

Claims

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Application Information

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IPC IPC(8): H02M7/5395H02J3/24H02J3/01
CPCH02M7/5395H02J3/24H02J3/01H02J2203/20Y04S10/50
Inventor 陈景文王依妍张文倩周媛刘嘉欣
Owner SHAANXI UNIV OF SCI & TECH
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