Photovoltaic air conditioner control method and apparatus and photovoltaic air conditioner

Patent metadata

Field	Value
Publication number	US-11879660-B2
Application number	US-202017621872-A
Country	US
Kind code	B2
Filing date	Jul 7, 2020
Priority date	Aug 30, 2019
Publication date	Jan 23, 2024
Grant date	Jan 23, 2024

Abstract

A photovoltaic air conditioner control method and apparatus and a photovoltaic air conditioner. The method includes: detecting in real time the grid-connected side inverter module temperature and the grid-connected side current of a photovoltaic air conditioner; determining the interval in which the grid-connected inverter module temperature is located and the interval in which the grid-connected side current is located; and, on the basis of the determining results, performing frequency-limiting and frequency-reduction control of the photovoltaic air conditioner.

First claim

What is claimed is:

1. A photovoltaic air conditioner control method, comprising:
detecting grid-side inverter module temperate and grid-side current of a photovoltaic air conditioner in real time;
determining an interval in which the grid-side inverter module temperature is located and an interval in which the grid-side current is located; and
performing frequency limitation and frequency reduction control on the photovoltaic air conditioner according to a determination result comprising:
controlling a compressor of the photovoltaic air conditioner to continue to operate according to a current operating state if the grid-side inverter module temperature is less than or equal to a first temperature threshold and the grid-side current is less than or equal to a first current threshold;
controlling the compressor of the photovoltaic air conditioner to operate stably at a current frequency if the grid-side inverter module temperature and the grid-side current continue to rise, when the grid-side inverter module temperature is greater than or equal to a second temperature threshold and less than a third temperature threshold, or the grid-side current is greater than or equal to a second current threshold and less than a third current threshold; and
controlling the compressor of the photovoltaic air conditioner to reduce its frequency if the grid-side inverter module temperature and the grid-side current continue to rise, when the grid-side inverter module temperature is greater than or equal to the third temperature threshold, or the grid-side current is greater than or equal to the third current threshold.

2. The photovoltaic air conditioner control method according to claim/wherein performing frequency limitation and frequency reduction control on the photovoltaic air conditioner according to the determination result further comprises:
controlling the compressor of the photovoltaic air conditioner to exit frequency reduction operation after controlling the compressor of the photovoltaic air conditioner to reduce its frequency, if the grid-side inverter module temperature is less than or equal to a fourth temperature threshold and the grid-side current is less than or equal to a fourth current threshold;
controlling the compressor of the photovoltaic air conditioner to operate stably at a current frequency if the grid-side inverter module temperature is greater than or equal to the second temperature threshold and less than the fourth temperature threshold, or the grid-side current is greater than or equal to the second current threshold and less than the fourth current threshold; and
controlling the compressor of the photovoltaic air conditioner to exit frequency limitation operation if the grid-side inverter module temperature is less than or equal to the first temperature threshold and the grid-side current is less than or equal to the first current threshold, wherein:
the first temperature threshold, the second temperature threshold, the fourth temperature threshold and the third temperature threshold increase sequentially, and the first current threshold, the second current threshold, the fourth current threshold and the third current threshold increase sequentially.

3. A photovoltaic air conditioner control method comprising:
detecting grid-side inverter module temperate and grid-side current of a photovoltaic air conditioner in real time;
determining an interval in which the grid-side inverter module temperature is located and an interval in which the grid-side current is located; and
performing frequency limitation and frequency reduction control on the photovoltaic air conditioner according to a determination result, comprising:
setting or resetting preset flag bits according to the determination result, wherein the preset flag bits comprise a frequency limitation flag bit and a frequency reduction flag bit; and
performing frequency limitation and frequency reduction control on the photovoltaic air conditioner according to strategies corresponding to the processed preset flag bits.

4. The photovoltaic air conditioner control method according to claim 3 , wherein setting or resetting preset flag bits according to the determination result comprises:
resetting the frequency limitation flag bit and the frequency reduction flag bit if the grid-side inverter module temperature is less than or equal to a first temperature threshold and the grid-side current is less than or equal to a first current threshold;
setting the frequency limitation flag bit if the grid-side inverter module temperature and the grid-side current continue to rise, when the grid-side inverter module temperature is greater than or equal to a second temperature threshold and less than a third temperature threshold, or the grid-side current is greater than or equal to a second current threshold and less than a third current threshold; and
setting the frequency reduction flag bit if the grid-side inverter module temperature and the grid-side current continue to rise, when the grid-side inverter module temperature is greater than or equal to the third temperature threshold, or the grid-side current is greater than or equal to the third current threshold.

5. The photovoltaic air conditioner control method according to claim 4 , wherein setting or resetting preset flag bits according to the determination result further comprises:
resetting the frequency reduction flag bit after setting the frequency reduction flag bit, if the grid-side inverter module temperature is less than or equal to a fourth temperature threshold and the grid-side current is less than or equal to a fourth current threshold;
setting the frequency limitation flag bit if the grid-side inverter module temperature is greater than or equal to the second temperature threshold and less than the fourth temperature threshold, or the grid-side current is greater than or equal to the second current threshold and less than the fourth current threshold; and
resetting the frequency limitation flag bit if the grid-side inverter module temperature is less than or equal to the first temperature threshold and the grid-side current is less than or equal to the first current threshold.

6. The photovoltaic air conditioner control method according to claim 3 , wherein: setting a flag bit indicates “enabled” and resetting a flag bit indicates “disabled”.

7. The photovoltaic air conditioner control method according to claim 3 , wherein:
a strategy corresponding to setting the frequency limitation flag bit is to perform frequency limitation operation on the photovoltaic air conditioner;
a strategy corresponding to resetting the frequency limitation flag is not to limit the frequency of the photovoltaic air conditioner or exit frequency limitation operation, and not to limit photovoltaic power generation;
a strategy corresponding to setting the frequency reduction flag bit is to perform frequency reduction operation on the photovoltaic air conditioner; and
a strategy corresponding to resetting the frequency reduction flag bit is not to perform frequency reduction operation on the photovoltaic air conditioner, or exit frequency reduction operation.

8. A photovoltaic air conditioner control apparatus, comprising:
a detection module configured to detect grid-side inverter module temperature and grid-side current of a photovoltaic air conditioner in real time;
a determination module configured to determine an interval in which the grid-side inverter module temperature is located and an interval in which the grid-side current is located; and
a control module configured to perform frequency limitation and frequency reduction control on the photovoltaic air conditioner according to a determination result, comprising:
controlling

Assignees

• Gree Electric Appliances Inc Zhuhai

Inventors

• Xiao Zunhui
• Qu Dongrui
• Yu Xianqiao
• Chen Ningning

Classifications

• F24F11/86 Primary

  by controlling compressors within refrigeration or heat pump circuits · CPC title

• F24F11/64 Primary

  using pre-stored data · CPC title

• F24F2005/0067

  with photovoltaic panels · CPC title

• F24F11/88

  Electrical aspects, e.g. circuits · CPC title

• F25B2700/151

  of the compressor motor · CPC title