WO2018214765A1

WO2018214765A1 - Method for controlling air conditioner powered by uninterruptible power supply, and air conditioner

Info

Publication number: WO2018214765A1
Application number: PCT/CN2018/086643
Authority: WO
Inventors: 李洪超; 郭亮; 王立刚; 张静; 王月亮; 卢保东
Original assignee: 青岛海尔空调器有限总公司
Priority date: 2017-05-22
Filing date: 2018-05-14
Publication date: 2018-11-29
Also published as: CN107228452B; CN107228452A

Abstract

A method for controlling an air conditioner powered by an uninterruptible power supply comprises: when a mains supply is interrupted, a storage battery in a UPS supplies power to an air conditioner; the UPS detects a real-time output power P0 of the UPS; if the real-time output power P0 of the UPS is greater than a rated load PS of the UPS, the UPS generates an overload alarm signal and outputs the overload alarm signal to a control chip of the air conditioner; after receiving the overload alarm signal, the control chip of the air conditioner controls a compressor to operate according to a first overload operating frequency PP1, the first overload operating frequency PP1 being less than an actual operating frequency P1; the compressor maintains the first overload operating frequency PP1 to operate; the UPS detects a feedback output power Pf generated by the compressor operating according to the first overload operating frequency PP1; and if the feedback output power Pf is less than or equal to the rated load PS, the compressor maintains the first overload operating frequency Pp1 to operate, until the mains supply is restored or an end voltage of the storage battery drops to 0. Also disclosed is an air conditioner. The present invention has the advantages of high automation degree and good user experience.

Description

Uninterruptible power supply air conditioner control method and air conditioner

Technical field

The present invention relates to the field of air conditioning technology, and in particular, to a UPS power supply air conditioner control method and an air conditioner using the same.

Background technique

In some countries and regions with relatively backward economies, such as Ethiopia in Africa and Pakistan in Asia, the coverage rate of power users is only 20% to 40%, the power supply quality is also very poor, the fluctuation of power supply voltage and frequency is large, and the waveform is distorted. Serious, while the power supply may be interrupted at any time. Ordinary household appliances, such as lighting equipment, are generally powered by batteries.

technical problem

However, for hospitals, bank clearing centers, civil aviation, meteorological departments, etc., it is also necessary to use air conditioners to maintain normal work. In order to avoid air conditioner shutdown, UPS power supplies are generally provided for air conditioners. Due to the relative backwardness of these areas, it is likely that the UPS power supply and air conditioner load are not matched. When the power is cut off instantaneously, the UPS operates in the overload protection mode and the inverter stops, which causes the air conditioner to be unusable.

Technical solution

The invention provides a control method for a UPS power supply air conditioner, so as to solve the problem that the UPS works in an overload protection mode and the inverter is stopped, thereby causing the air conditioner to be unusable.

A UPS power supply air conditioner control method includes the following steps:

The mains is interrupted, and the battery in the UPS supplies power to the air conditioner;

The UPS detects the UPS real-time output power P ₀ . If the UPS real-time output power P _{0 is} greater than the UPS rated load P _s , the UPS generates an overload alarm signal and outputs it to the control chip of the air conditioner;

After receiving the overload alarm signal, the control chip of the air conditioner outputs a first frequency control signal to control the compressor to operate according to the first overload operating frequency P _p1 , and the first overload operating frequency P _{p1 is} smaller than the actual operating frequency P ₁ . The compressor maintains the first overload operating frequency P _{p1 to} operate;

The UPS detects a feedback output power P _f generated by the air conditioner operating according to the first overload operating frequency P _p1 , and if the feedback output power P _{f is} less than or equal to the rated load P _s , the compressor maintains the first overload operating frequency P _{p1 is} operated until the mains supply is restored or the terminal voltage of the battery drops to zero.

Further, if the feedback output power P _{f is} greater than the rated load P _s , the UPS generates an overload alarm signal N times and outputs the overload alarm signal to the control chip of the air conditioner N times, and the control chip of the air conditioner Generating a frequency control signal corresponding to each of the overload alarm signals, controlling the compressor to operate according to the overload operating frequency P _pN , the overload operating frequency P _pN = P _pN-1 -X; until the feedback output power P _{f is} less than or equal to the Rated load P _s , the last overload operating frequency P _pN generated by the control chip of the air conditioner is the protection operating frequency, and the compressor maintains the protection operating frequency until the mains supply is restored or the terminal voltage of the battery in the UPS drops to 0; where N ≥ 1.

Further, the UPS is stored nominal load P _s corresponding to the rated current I _s; utility power fails, power supply UPS is an air conditioner, the air conditioner control chip detects the UPS signal and generate a first operating current I _p0, the The first operating current I _{p0 is} smaller than the rated current I _s , and the control chip of the air conditioner generates an actual operating frequency P ₁ according to the first operating current I _p0 and controls the compressor to operate according to the actual operating frequency P ₁ .

Preferably, the compressor operation frequency P ₁ realtime operation, UPS real output power less than P ₀ 1.1P _s.

Further, after receiving the overload alarm signal, the control chip of the air conditioner reduces the first operating current I _p0 by a first amplitude A to generate a first control current I _p1 , and the first control current I _p1 = I _p0 -A, the air conditioner control chip to generate the first frequency P _p1 overload operation according to the first control current I _p1.

Further, if the control chip of the air conditioner receives the overload alarm signal N times, the control chip of the air conditioner generates a control current I _pN corresponding to each of the overload alarm signals, I _pN = I _{pN- 1} -A, the air conditioner control chip generates overload operation frequency according to the control current I _pN P _pN.

Preferably, the first amplitude A is a fixed value pre-existing in the control chip of the air conditioner.

Preferably, A = 1A.

Further, a plurality of control currents I _pX , I _pX =I _p0 -NA are pre-stored in the control chip of the air conditioner, and the overload alarm signal includes a difference P _{m between the} real-time output power P _{0 of the} UPS and the rated load Ps. The control chip of the air conditioner calls a corresponding control current I _pX according to the difference P _m , and I _pX increases as P _m increases.

The UPS power supply air conditioner control method disclosed by the invention can make the air conditioner not stop due to the overload protection of the UPS when the UPS is supplying the air conditioner, and at the same time, control the optimal operation mode of the compressor under the current power supply condition on the one hand. On the other hand, the UPS and the battery are protected, which has the advantages of good running effect and good cooling capacity.

Also disclosed is an air conditioner using a UPS power supply air conditioner control method. The UPS power supply air conditioner control method includes the following steps:

Beneficial effect

The air conditioner disclosed by the invention can automatically form a preferred power distribution scheme when the mains power source is abnormal, and the air conditioner can be kept without stopping and extended to a sufficient running time.

DRAWINGS

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, a brief description of the drawings used in the embodiments or the prior art description will be briefly described below. Obviously, the drawings in the following description It is a certain embodiment of the present invention, and other drawings can be obtained from those skilled in the art without any inventive labor.

1 is a flow chart of a first embodiment of a method for controlling a UPS power supply air conditioner according to the present invention;

2 is a flow chart of a second embodiment of a method for controlling a UPS power supply air conditioner according to the present invention;

3 is a flow chart of a third embodiment of a method for controlling a UPS power supply air conditioner according to the present invention.

Embodiments of the invention

The technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the drawings in the embodiments of the present invention. It is a partial embodiment of the invention, and not all of the embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative efforts are within the scope of the present invention.

1 is a flow chart showing a first embodiment of a method for controlling a UPS power supply air conditioner disclosed in the present invention. The UPS power supply air conditioner referred to in this embodiment refers to an air conditioner equipped with a UPS device. In the UPS device, an overvoltage detection circuit and an overcurrent detection circuit are provided. When the output voltage or the output current exceeds the set value, the UPS device cuts off the output of the inverter, stops supplying power to the load, and functions as a load and a UPS. The protection of the equipment. However, since the air conditioner is a load that changes with the working conditions, during the power supply of the UPS device, there may be a problem of alarm or even shutdown due to the load change of the air conditioner, so that the air conditioner is forced to stop. , reducing the user experience. If it is used in a special place such as a hospital, it is more likely to cause irreversible damage. The UPS power supply air conditioner control method disclosed in this embodiment aims to solve this problem.

Specifically, when the utility power is normal, the air conditioner receives the temperature detection value output by the indoor temperature sensor. The temperature sensor is preferably disposed on the air return of the air conditioner. The difference between the indoor temperature and the set temperature is used as an input parameter to control the compressor operation of the air conditioner, and the humidity and temperature of the air-conditioned room are adjusted. When the utility power is interrupted, the air conditioner receives the battery power supply signal through the power supply circuit, and the air conditioner will exit from the normal control mode under the control of the air conditioner control chip, and enter the UPS power supply control mode.

After entering the UPS power supply control mode, the UPS first detects the UPS real-time output power P ₀ . If the UPS real-time output power P _{0 is} greater than the UPS rated load P _s , the UPS generates an overload alarm signal and outputs the control chip to the air conditioner. . At one end of the air conditioner, the control chip of the air conditioner collects whether an overload alarm signal is generated. If no overload alarm signal is generated, it means that when the normal control mode is exited and the UPS power supply mode is started, the total power of the air conditioner corresponding to the actual operating frequency of the compressor satisfies the condition that the rated power of the UPS is equal to or less than the rated power of the UPS. Maintain this frequency operation without alarm or shutdown. If an overload alarm signal is generated, the control chip of the air conditioner performs frequency reduction control on the air conditioner after receiving the overload alarm signal. Specifically, the control chip of the air conditioner outputs a first frequency control signal, and controls to operate the compressor according to the first overload operating frequency P _p1 , the first overload operating frequency P _{p1 is} smaller than the actual operating frequency P ₁ , and the compressor maintains the first An overload operating frequency P _{p1 is} operated. During the operation of the compressor maintaining the first overload operating frequency P _p1 , the UPS monitors and detects the feedback output power P _f generated by the air conditioner operating according to the first overload operating frequency P _p1 , if the feedback output power If P _{f is} less than or equal to the rated load P _s , the compressor maintains the first overload operating frequency P _p1 until the mains supply is restored or the terminal voltage of the battery drops to zero.

If the feedback output power P _f detected by the UPS is greater than the rated load P _s , or in the UPS power supply mode, the feedback output power P _f detected by the UPS is greater than the rated load P _s at a certain time, then The UPS generates an overload alarm signal again and outputs the overload alarm signal to the control chip of the air conditioner. The control chip of the air conditioner generates a frequency control signal corresponding to the overload alarm signal, and controls the compressor according to the overload operation frequency P _{p2 .} Operation, overload operating frequency P _p2 = P _p1 -X. The UPS determines whether the feedback output power P _f detected by the UPS is less than or equal to the rated load P _s. when the compressor operates according to P _p2 _{, and} if the feedback output power P _{f is} less than or equal to the rated load P _s , the compressor maintains the The first overload operating frequency P _{p1 is} operated until the mains supply is restored or the terminal voltage of the battery drops to zero.

Referring to FIG. 2, the control chip of the air conditioner controls the down-conversion operation of the compressor according to the overload alarm signal, which is continuously iteratively cycled. Specifically, if the UPS generates N times of overload alarm signals during the operation of the battery in the UPS, the N may be 2 times, 3 times or more, and the overload alarm signal is divided into N. The output is output to the control chip of the air conditioner. The control chip of the air conditioner generates a frequency control signal corresponding to each of the overload alarm signals on the basis of the previous overload operating frequency P _pN , and controls the compressor to operate according to the overload operating frequency P _pN , and the overload operating frequency P _pN = P _{pN- 1} - X, until the feedback output power P _{f is} less than or equal to the rated load P _s , the last overload operating frequency P _pN generated by the control chip set by the air conditioner is the protection operating frequency, and the compressor maintains the protection operating frequency Run until the mains supply is restored or the terminal voltage of the battery in the UPS drops to zero.

Generally speaking, when the UPS is selected, the rated load of the UPS and the load matching of the air conditioner are taken into consideration. In order to protect the device, it is preferred to set the upper operating limit of the compressor to be less than the rated load of the UPS. Referring to FIG. 3, in order to achieve this, the rated current I _s corresponding to the rated load P _s is stored in the UPS. The rated current I _{s is} stored separately in a storage unit of the UPS, so that it can be called at any time to improve the speed of the call. When the utility power is interrupted, the UPS supplies power to the air conditioner, and the control chip of the air conditioner detects the UPS power supply signal. The control chip of the air conditioner requests to call the rated current I _s from the storage unit of the UPS, and generates a first operating current I _p0 according to the rated current I _s , the first operating current I _{p0 being} smaller than the rated current I _s , The control chip of the air conditioner generates an actual operating frequency P ₁ according to the first operating current I _p0 and controls the compressor to operate according to the actual operating frequency P ₁ . The difference between the first operating current I _p0 and the rated current I _s is preferably a fixed value. When the compressor is operated according to the real-time operating frequency P ₁ , the UPS real-time output power P _{0 is} less than 1.1P _s , which is less than 110% of the rated load. When the UPS supplies power to the air conditioner, the real-time operating frequency P ₁ of the compressor is the upper limit frequency of the compressor operation, and the subsequent tracking and down-conversion is based on the upper limit frequency, and the UPS does not enter the overload protection program during the entire running process. Directly cut off the output of the inverter, causing the air conditioner to stop.

Considering the power supply characteristics of the UPS and the characteristics of the air conditioner, it is preferred to use the current as an input parameter of the compressor down-conversion control. Specifically, after receiving the overload alarm signal, the control chip of the air conditioner will perform the first operation. The current I _p0 decreases the first amplitude A to generate a first control current I _p1 , the first control current I _p1 = I _p0 −A, and the control chip of the air conditioner generates the according to the first control current I _p1 The first overload operating frequency P _p1 . Similarly, if the control chip of the air conditioner receives the overload alarm signal N times, the control chip of the air conditioner generates a control current I _pN corresponding to each of the overload alarm signals, I _pN = I _{pN- 1} -A, the air conditioner control chip generates overload operation frequency according to the control current I _pN P _pN. The first amplitude A is preferably a fixed value and is pre-stored in the control chip of the air conditioner. The first amplitude A is preferably 1A.

In order to reduce the frequency of the compressor to a desired range as soon as possible, a plurality of control currents I _pX , I _pX =I _p0 -NA may be pre-stored in the control chip of the air conditioner, and the overload alarm signal includes the UPS in real time. the difference between the output power P ₀ and the rated load Ps P _m, the air conditioner control chip call the corresponding control current I _pX according to the difference value P _m, I _pX with increasing P _m increases. With this control method, the operation of the compressor can be quickly reduced to the desired range, and the number of times the overload warning signal is generated and the duration of the overload control signal for the entire control flow are reduced.

According to the UPS power supply air conditioner control method disclosed in the above three embodiments of the present invention, when the UPS is powered by the air conditioner, the air conditioner does not stop due to the overload protection of the UPS, and at the same time, the compressor is operated on the current power supply condition. The optimal operating mode underneath, on the other hand, protects the UPS and the battery, and has the advantages of good running effect and good cooling capacity.

The present invention also provides an air conditioner using the above UPS power supply air conditioner control method. The control method of the UPS power supply air conditioner is specifically described in detail in the above embodiments and the drawings, and details are not described herein again. The air conditioner using the above UPS power supply air conditioner control method can achieve the same technical effect.

It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and are not limited thereto; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that The technical solutions described in the foregoing embodiments are modified, or the equivalents of the technical features are replaced. The modifications and substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

A UPS power supply air conditioner control method, characterized in that the method comprises the following steps:

The mains is interrupted, and the battery in the UPS supplies power to the air conditioner;

The UPS detects the UPS real-time output power P 0 . If the UPS real-time output power P 0 is greater than the UPS rated load P s , the UPS generates an overload alarm signal and outputs it to the control chip of the air conditioner;

After receiving the overload alarm signal, the control chip of the air conditioner outputs a first frequency control signal to control the compressor to operate according to the first overload operating frequency P p1 , and the first overload operating frequency P p1 is smaller than the actual operating frequency P 1 . The compressor maintains the first overload operating frequency P p1 to operate;

The UPS detects a feedback output power P f generated by the air conditioner operating according to the first overload operating frequency P p1 , and if the feedback output power P f is less than or equal to the rated load P s , the compressor maintains the first overload operating frequency P p1 is operated until the mains supply is restored or the terminal voltage of the battery drops to zero.
The UPS power supply air conditioner control method according to claim 1, wherein

If the feedback output power P f is greater than the rated load P s , the UPS generates an overload alarm signal N times and outputs the overload alarm signal to the control chip of the air conditioner N times, and the control chip of the air conditioner corresponds to each The overload alarm signal generates a frequency control signal, and controls the compressor to operate according to the overload operating frequency P pN , the overload operating frequency P pN = P pN-1 -X; until the feedback output power P f is less than or equal to the rated load P s , the last overload operating frequency PpN generated by the control chip of the air conditioner is the protection operating frequency, and the compressor maintains the protection operating frequency until the mains supply is restored or the terminal voltage of the battery in the UPS drops to 0; N ≥ 1.
The UPS power supply air conditioner control method according to claim 1 or 2, characterized in that

The rated current I s corresponding to the rated load P s is stored in the UPS;

The utility power is interrupted, the UPS supplies power to the air conditioner, and the control chip of the air conditioner detects the UPS power supply signal and generates a first operating current I p0 , the first operating current I p0 is smaller than the rated current I s , and the air conditioner controls The chip generates an actual operating frequency P 1 according to the first operating current I p0 and controls the compressor to operate according to the actual operating frequency P 1 .
UPS power supply control method of the air conditioner according to claim 3, characterized in that the compressor operation frequency P 1 according to real-time operation, the real-time UPS output power P 0 is less than 1.1P s.
The UPS power supply air conditioner control method according to claim 4, wherein the control chip of the air conditioner reduces the first operating current I p0 by a first amplitude A after receiving the overload alarm signal a control current I p1, the first control current I p1 = I p0 -A, the air conditioner control chip according to the first control current I p1 generate the first operating frequency overload P p1.
The UPS power supply air conditioner control method according to claim 5, wherein if the control chip of the air conditioner receives the overload warning signal N times, the control chip of the air conditioner corresponds to each of the overloads generating an alarm signal a control current I pN, I pN = I pN -1 -A, the air conditioner control over the chip to generate a control current according to the operating frequency of the carrier I pN P pN.
The UPS power supply air conditioner control method according to claim 6, wherein the first amplitude A is a fixed value pre-stored in a control chip of the air conditioner.
The UPS power supply air conditioner control method according to claim 6, wherein A=1A.
The UPS power supply air conditioner control method according to claim 4, wherein a plurality of control currents I pX , I pX =I p0 -NA are pre-stored in the control chip of the air conditioner, and the overload alarm signal includes real-time difference between the UPS output power P 0 and the rated load Ps P m, the air conditioner control chip call the corresponding control current I pX according to the difference value P m, I pX with increasing P m increases .
An air conditioner characterized by using the UPS power supply air conditioner control method according to any one of claims 1 to 9.