Active thermal control method of optical storage DC micro-grid system
A DC micro-grid and thermal control technology, applied in control/regulation systems, photovoltaic power stations, electric vehicles, etc., can solve problems such as over-temperature failure, prevent over-temperature, improve thermal safety and power supply continuity, improve The effect of short-term overload capability
Pending Publication Date: 2021-06-11
NANJING UNIV OF SCI & TECH
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[0006] The purpose of the present invention is to provide an active thermal control method for an optical-storage DC micro-grid system, which solves the problem of over-temperature failure of power devices in the existing optical-storage DC micro-grid system when the cooling capacity drops or overloads, and improves the The thermal safety and continuity of power supply of the solar-storage DC micro-grid system also safely improves the short-term overload capability of the system
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[0021] The present invention will be further described below in conjunction with the accompanying drawings and examples, so that those skilled in the art can better understand the present invention and implement it, but the given examples are not intended to limit the present invention.
[0022] Such as figure 1 As shown, the active thermal control method of an optical storage DC micro-grid system according to the present invention, the implementation steps are as follows:
[0023] Step 1: Establish a power device junction-case thermal network model, and simultaneously collect state parameters of the photovoltaic power generation control circuit, state parameters of the energy storage battery charge and discharge control circuit, and environmental parameters; the state parameters of the photovoltaic power generation control circuit include photovoltaic array output Voltage V PV , PV array output current I PV , The power device loss value P in the photovoltaic power generatio...
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The invention discloses an active thermal control method of an optical storage DC micro-grid system. The method comprises the following steps: firstly, establishing a thermal network model of a power device, and simultaneously collecting photovoltaic array output voltage, photovoltaic array output current, DC power grid voltage, energy storage battery voltage, energy storage battery charging and discharging current, power device loss, power device shell temperature and environment temperature; then, estimating the junction temperature of the power device according to the power device loss, the shell temperature and the environment temperature in combination with the thermal network model of the power device; according to a perturbation and observation method of photovoltaic array maximum power dynamic limitation and double closed-loop PI control of energy storage battery charging and discharging current dynamic limitation, outputting a power device PWM signal duty ratio value subjected to active thermal control; and finally, carrying out active thermal control on the optical storage DC micro-grid system according to the duty ratio value of the PWM signal of the power device. According to the invention, the junction temperature of the power device can be prevented from exceeding the maximum allowable value, and the thermal safety, the power supply continuity and the short-time overload capability of the optical storage DC micro-grid system are improved.
Description
technical field [0001] The invention belongs to the field of thermal control of power devices, and in particular relates to an active thermal control method for an optical storage direct current microgrid system. Background technique [0002] Photovoltaic-storage DC micro-grid system is a main form of photovoltaic power generation. It has a simple structure, short construction period, and can effectively solve the problem of difficult electricity consumption for factories, households and public utilities in remote areas where the grid is difficult to cover, so it has been widely used. However, when the solar-storage DC micro-grid system has poor heat dissipation or overload operation, the solar-storage DC micro-grid system is prone to frequent shutdowns or even overheating failures due to overheating of power devices, which affects the thermal safety and power supply continuity of the system. [0003] The loss of power devices is the root cause of its heating, especially whe...
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IPC IPC(8): H02S10/20H02J7/35H02J7/00G05F1/67
CPCH02S10/20H02J7/35H02J7/007192G05F1/67Y02E70/30Y02E10/56
Inventor 应展烽熊城邱纯陈灯李德明谢佳伟
Owner NANJING UNIV OF SCI & TECH