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Multi-grid-connected inverter power switching device active power consumption cooperative control system and method

A power switching device and power consumption control technology, applied in the direction of converting AC power input to DC power output, output power conversion device, electrical components, etc., can solve the problems of reducing switching frequency and not involving dynamic adjustment of switching frequency, etc., to achieve Reduce switching frequency, increase adjustment range, and prolong life

Active Publication Date: 2022-03-25
SHANDONG UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, this method only considers reducing the switching frequency, and does not involve dynamically adjusting the switching frequency

Method used

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  • Multi-grid-connected inverter power switching device active power consumption cooperative control system and method
  • Multi-grid-connected inverter power switching device active power consumption cooperative control system and method
  • Multi-grid-connected inverter power switching device active power consumption cooperative control system and method

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Experimental program
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Effect test

Embodiment 1

[0065] In one or more embodiments, a cooperative control system for active power consumption of power switching devices of multi-grid-connected inverters is disclosed, referring to figure 1 ,include:

[0066] The local active power consumption control parameter calculation module (L2) is configured to control the switching frequency to increase when the output of the grid-connected inverter decreases to prevent the cooling of the device, and to control the switching frequency to decrease when the output increases to prevent the temperature of the device from rising too high. Smooth junction temperature fluctuations;

[0067] The multi-grid-connected inverter pulse width modulation wave frequency optimization calculation module (H1) is configured to establish a grid-connected inverter cluster active power consumption cooperative optimization model and solve the model to obtain the pulse width modulation frequency and pulse The best phase angle of wide modulation wave, output t...

Embodiment 2

[0084] In one or more implementations, a method for cooperative control of active power consumption of power switching devices of multi-grid-connected inverters is disclosed, referring to image 3 , including the following steps:

[0085] (1) Based on the existing power switching device loss calculation results, and according to the operating parameters at time k, calculate the power switching device voltage and current stress, and use the parameters in the power switching device data sheet to obtain the conduction loss, because the conduction loss is not affected by PWM frequency effect, denoted as P M,ON . Select a limited number of values ​​​​in the PWM frequency lower than the rated value, and calculate the switching loss at different PWM frequencies, and express it as P M,SW [f M,c(k)]. Thereby, the losses of the power switching devices at different PWM frequencies are obtained.

[0086] P M,loss (k)=P M,SW [f M,c (k)]+P M,ON f M,c (k)M,c,rated (3)

[0087] (...

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Abstract

The invention discloses a system and method for active power consumption cooperative control of multi-grid-connected inverter power switching devices, including: a local active power consumption control parameter calculation module, which is configured to control the switching frequency when the output of the grid-connected inverter decreases increase to prevent device cooling, control the switching frequency to decrease when the output rises to prevent excessive temperature rise of the device, and smooth junction temperature fluctuations; multi-grid inverter pulse width modulation wave frequency optimization calculation module is configured to establish grid-connected inverter Transformer cluster active power consumption collaborative optimization model and solve the model to obtain the optimal phase angle of the PWM frequency and PWM wave, and output the corresponding carrier phase; the PWM wave frequency controls the local execution module, It is configured to output a local optimal phase shift angle according to the input phase locking result and the carrier phase. The invention can eliminate main high-frequency harmonics, reduce the requirement of output current harmonic constraints on PWM frequency, and further greatly increase the adjustment range of PWM frequency.

Description

technical field [0001] The invention relates to the technical field of electrical control, in particular to a system and method for active power consumption cooperative control of power switching devices of multi-grid-connected inverters. Background technique [0002] The statements in this section merely provide background information related to the present invention and do not necessarily constitute prior art. [0003] In recent years, the installed capacity of new energy, mainly wind power and photovoltaics, has grown rapidly, highlighting the important position of new energy power generation. The grid-connected inverter is an important flexible and controllable equipment for the connection between the new energy power generation system and the power grid. Its operational reliability is a key indicator that both inverter manufacturers and new energy users pay attention to. It is very important for reducing maintenance costs and increasing power generation. [0004] Accor...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M7/537H02J3/38
CPCH02M7/537H02J3/381H02J2203/20H02J2300/24Y02E10/56
Inventor 许涛高峰刘梓柒
Owner SHANDONG UNIV
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