Method for calculating on-load runtime of UPS (Uninterrupted Power Supply)

Abstract

The invention relates to the technical field of storage batteries, and particularly discloses a UPS on-load runnable time calculation method, which comprises the following steps: calculating a power value Pe according to UPS system parameters, searching a storage battery parameter table for two power values P1 and P2 adjacent to the power value Pe and time T1 and T2 corresponding to the two power values P1 and P2, multiplying the power values Pe, P1 and P2 by the corresponding time, and calculating the on-load runnable time of a UPS. Then an equal ratio method is adopted for calculation, the calculation result is the runnable time Te, the calculation result calculated in this way is close to and slightly lower than an actual value, the calculation result is used as the runnable time, the stability of system operation can be ensured, configuration of the energy storage system can be most appropriate, and the energy storage system can be protected from being damaged. The calculation accuracy of the on-load runtime of the UPS is effectively improved, in addition, the optimization of the configuration of the UPS is facilitated, and reliable power support can be provided at a critical moment.

Description

Technical Field

[0001] The invention belongs to the technical field of storage batteries, and in particular relates to a method for calculating the load-carrying operating time of a UPS. Background Art

[0002] UPS refers to uninterruptible power supply, which is a device containing energy storage, and its energy storage device mostly uses batteries. When the city power is interrupted, the UPS immediately outputs the power of the battery inside the machine. The actual running time of the UPS is an important parameter to determine the stability of the UPS system and the accuracy of the configuration.

[0003] At present, the method of estimating the actual running time of UPS is based on experience, which is often not very accurate. If the estimate is too high, it will pose a risk to the safety of the system. If the estimate is too low, the configuration of the energy storage system will increase, resulting in waste. Therefore, we need to propose a method for calculating the UPS load operating time to solve the above problems, so that it can effectively improve the accuracy of the UPS load operating time estimate. Summary of the invention

[0004] The object of the present invention is to provide a method for calculating the UPS load operating time, which can effectively improve the accuracy of estimating the UPS load operating time, so as to solve the problems raised in the above background technology.

[0005] To achieve the above object, the present invention adopts the following technical solutions:

[0006] A method for calculating the loadable operating time of a UPS comprises the following steps:

[0007] S1. Calculate the power value Pe according to the UPS system parameters;

[0008] S2, searching the battery parameter table for two power values ​​P1 and P2 adjacent to the power value Pe, and the times T1 and T2 corresponding to the two power values ​​P1 and P2;

[0009] S3. Multiply the power values ​​Pe, P1 and P2 by the corresponding time respectively, and then use the geometric ratio method to calculate. The result is the available operating time Te. The calculation formula is as follows:

[0010]

[0011] Preferably, in step S1, the UPS system is mainly composed of a rectifier, a battery, an inverter and a static switch, the output end of the rectifier is connected to the battery, the output end of the battery is connected to the inverter, the output end of the inverter is connected to the static switch, and the static switch is connected to the input end of the rectifier.

[0012] Preferably, the UPS system parameters include rated power, input voltage, output voltage, output current, backup time and power factor, and the power value Pe is calculated as follows: power value Pe=output voltage*output current*power factor.

[0013] Preferably, in step S2, the battery parameter table includes a model, a power value FV and a time, wherein the model includes 1.60V / battery, 1.67V / battery, 1.70V / battery, 1.75V / battery, 1.80V / battery, 1.85V / battery and 1.90V / battery.

[0014] Preferably, in the battery parameter table, the power value Pe is associated with the operable time Te, and the power value P1 and the power value P2 are two endpoints selected for calculating the power value Pe.

[0015] Preferably, in step S3, the steps of geometric ratio calculation are as follows:

[0016] A1. List the first equation:

[0017]

[0018] A2, write the second equation:

[0019] T2*Te*Pe-T1*T2*P1-T1*Te*Pe+T1*T1*P1=T2*Te*P2-T1*Te*P1-T1*T2*P2+T1*T1*P1

[0020] A3. Write down the third equation:

[0021] T2*Te*Pe-T1*T2TP1-T1*Te*Pe=T2*Te*P2-T1*Te*P1-T1*T2*P2

[0022] A4. Write down the fourth equation:

[0023] T1*T2*P2-T1*T2*P1=T2*Te*P2-T1*Te*P1-T2*Te*Pe+T1*Te*Pe

[0024] A5. Write down the fifth equation:

[0025] T1*T2*(P2-P1)=Te*(T2*P2-T1*P1-T2*Pe+T1*Pe)

[0026] A6. Calculate the running time Te:

[0027]

[0028] Preferably, the power value Pe is calculated by reverse calculation based on the runnable time Te to verify the accuracy of the geometric ratio method. The calculation formula for the reverse calculation of the power value Pe is:

[0029]

[0030] Preferably, the rectifier rectifies the input AC and converts it into DC by using thyristor or IGBT electronic components, and then outputs the converted DC through a device to provide smooth DC power.

[0031] Preferably, the battery is a battery pack composed of multiple individual batteries connected in series, and the rectifier is provided with a connector connected to the mains. When the mains is normal, the battery is charged through the rectifier and the electrical energy is converted into chemical energy for storage. When the mains fails, the battery converts the chemical energy back into electrical energy to supply the inverter or directly supply power to the emergency load.

[0032] Preferably, the static switch is configured as a contactless switch, and the static switch is composed of reverse-parallel thyristors. The closing and opening of the static switch is controlled by a logic controller to complete automatic switching from mains power to battery backup power supply.

[0033] The method for calculating the UPS load operating time proposed in the present invention has the following advantages compared with the prior art:

[0034] The present invention first calculates the power value Pe according to the UPS system parameters, then searches the battery parameter table for two power values ​​P1 and P2 adjacent to the power value Pe, and the times T1 and T2 corresponding to the two power values ​​P1 and P2, and then multiplies the power values ​​Pe, P1 and P2 by the corresponding times respectively, and then uses the geometric ratio method to calculate, and the calculation result is the operational time Te. The calculation result obtained in this way will be close to and slightly lower than the actual value. Using the calculation result as the operational time can not only ensure the stability of system operation, but also make the configuration of the energy storage system most appropriate, effectively improve the calculation accuracy of the UPS load operational time, and also help to optimize the configuration of the UPS, and can ensure reliable power support at critical moments. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1 It is a flowchart of the present invention;

[0036] Figure 2 A battery parameter table of the present invention;

[0037] Figure 3 It is a schematic diagram of the numerical range after the power values ​​Pe, P1 and P2 of the present invention are multiplied by the corresponding time. DETAILED DESCRIPTION

[0038] The following will be combined with the accompanying drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments. The specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention. Based on the embodiments in the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0039] The present invention provides Figure 1-3 A method for calculating the UPS load operating time shown includes the following steps:

[0040] S1. Calculate the power value Pe according to the UPS system parameters;

[0041] The UPS system parameters include rated power, input voltage, output voltage, output current, backup time and power factor. The power value Pe is calculated as follows: power value Pe = output voltage * output current * power factor. UPS parameters are generally provided by the UPS manufacturer.

[0042] S2, searching the battery parameter table for two power values ​​P1 and P2 adjacent to the power value Pe, and the times T1 and T2 corresponding to the two power values ​​P1 and P2;

[0043] The battery parameter table includes model, power value FV and time, such as Figure 2 As shown, the models include 1.60V / battery, 1.67V / battery, 1.70V / battery, 1.75V / battery, 1.80V / battery, 1.85V / battery and 1.90V / battery. The battery parameter tables can be obtained through various channels such as manufacturers, sellers, online resources and user manuals. These battery parameter tables provide consumers with important information about battery performance and specifications, which helps to correctly select and use batteries. From detailed technical data provided by manufacturers to convenient queries on online resources, a variety of methods can help users obtain the required battery parameters.

[0044] In the battery parameter table, the power value Pe is associated with the operational time Te, and the power value P1 and the power value P2 are two endpoints selected for calculating the power value Pe.

[0045] S3. Multiply the power values ​​Pe, P1 and P2 by the corresponding time respectively, and then use the geometric ratio method to calculate. The result is the available operating time Te. The calculation formula is as follows:

[0046]

[0047] The specific steps of geometric calculation are as follows:

[0048] A1. List the first equation:

[0049]

[0050] A2, write the second equation:

[0051] T2*Te*Pe-T1*T2*P1-T1*Te*Pe+T1*T1*P1=T2*Te*P2-T1*Te*P1-T1*T2*P2+T1*T1*P1

[0052] A3. Write down the third equation:

[0053] T2*Te*Pe-T1*T2TP1-T1*Te*Pe=T2*Te*P2-T1*Te*P1-T1*T2*P2

[0054] A4. Write down the fourth equation:

[0055] T1*T2*P2-T1*T2*P1=T2*Te*P2-T1*Te*P1-T2*Te*Pe+T1*Te*Pe

[0056] A5. Write down the fifth equation:

[0057] T1*T2*(P2-P1)=Te*(T2*P2-T1*P1-T2*Pe+T1*Pe)

[0058] A6. Calculate the running time Te:

[0059]

[0060] The power value Pe is calculated by reverse calculation based on the running time Te to verify the accuracy of the geometric ratio method. The calculation formula for the reverse calculation of the power value Pe is:

[0061]

[0062] like Figure 2 The following table shows the battery parameters: Figure 3 The figure is a diagram of the numerical range after the power values ​​Pe, P1 and P2 are multiplied by the corresponding time. If the calculated power value Pe is 42.5W, the adjacent power values ​​P1 is 44.6 and P2 is 39.7 in the battery parameter table. The corresponding time T1 is 180 and T2 is 210. The calculation formula for the running time Te is:

[0063]

[0064] Using the calculated Te value for reverse calculation, the reverse calculation results are as follows:

[0065]

[0066] Among them, the UPS system is mainly composed of a rectifier, a battery, an inverter and a static switch. The output end of the rectifier is connected to the battery, the output end of the battery is connected to the inverter, the output end of the inverter is connected to the static switch, and the static switch is connected to the input end of the rectifier. Through the coordinated cooperation of the rectifier, battery, inverter and static switch, it is ensured that the UPS can continue to provide stable and reliable power supply when the city power fails.

[0067] The rectifier uses thyristors or IGBT electronic components to rectify the input AC and convert it into DC, and then outputs the converted DC through a device to provide stable DC. The rectifier can effectively convert AC into DC and also has the function of charging the battery. During use, the rectifier also needs to filter out fluctuations and noise in the current to ensure that the output DC is stable and can be used by the inverter or directly supplied to the load.

[0068] The storage battery is a battery pack composed of multiple individual batteries connected in series, and the rectifier is provided with a connector connected to the mains. When the mains is normal, the storage battery is charged through the rectifier and the electrical energy is converted into chemical energy for storage. When the mains fails, the storage battery converts the chemical energy back into electrical energy to supply the inverter or directly supply power to the emergency load, so that the storage battery can store sufficient electrical energy when the mains is normal, and can continue to provide a long-term stable power supply when the mains is interrupted.

[0069] The inverter converts the DC power provided by the battery into AC power with stable frequency and amplitude to meet the needs of various types of loads. The inverter includes an inverter bridge, control logic and filter circuit. By adopting technologies such as SPWM (sinusoidal pulse width modulation), adjusting the width of the output voltage and controlling the duty cycle, and filtering out high-order harmonics through the filter, a stable sinusoidal AC power can be output.

[0070] The static switch is configured as a contactless switch. The static switch is composed of reverse-parallel thyristors. The static switch is controlled to close and open by a logic controller to complete automatic switching from AC power to battery backup power supply, thereby facilitating seamless switching between AC power and inverter and ensuring uninterrupted power supply to critical loads.

[0071] The rectifier, battery, inverter and static switch form a close and efficient connection relationship, ensuring that the UPS system can provide stable and reliable power supply under various circumstances.

[0072] In summary, the calculation results obtained by the above method will be close to and slightly lower than the actual value. Using the calculation results as the operational time can not only ensure the stability of system operation, but also make the configuration of the energy storage system most appropriate, effectively improve the calculation accuracy of the UPS load operational time, and also help optimize the UPS configuration, and ensure reliable power support at critical moments.

[0073] Finally, it should be noted that the above is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, it is still possible for those skilled in the art to modify the technical solutions described in the aforementioned embodiments or to make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A method for calculating the loadable operating time of a UPS, characterized by: The steps include: S1. Calculate the power value Pe according to the UPS system parameters; S2, searching the battery parameter table for two power values ​​P1 and P2 adjacent to the power value Pe, and the times T1 and T2 corresponding to the two power values ​​P1 and P2; S3. Multiply the power values ​​Pe, P1 and P2 by the corresponding time respectively, and then use the geometric ratio method to calculate. The result is the available operating time Te. The calculation formula is as follows:

2. The method for calculating the UPS load-operable operating time according to claim 1, characterized in that: In step S1, the UPS system is mainly composed of a rectifier, a battery, an inverter and a static switch, the output end of the rectifier is connected to the battery, the output end of the battery is connected to the inverter, the output end of the inverter is connected to the static switch, and the static switch is connected to the input end of the rectifier.

3. The method for calculating the UPS load operating time according to claim 2, characterized in that: The UPS system parameters include rated power, input voltage, output voltage, output current, backup time and power factor. The power value Pe is calculated as follows: power value Pe=output voltage*output current*power factor.

4. The method for calculating the UPS load operating time according to claim 3, characterized in that: In step S2, the battery parameter table includes a model, a power value FV and a time, wherein the model includes 1.60V / battery, 1.67V / battery, 1.70V / battery, 1.75V / battery, 1.80V / battery, 1.85V / battery and 1.90V / battery.

5. The method for calculating the UPS load operating time according to claim 4, characterized in that: In the battery parameter table, the power value Pe is associated with the operational time Te, and the power value P1 and the power value P2 are two endpoints selected for calculating the power value Pe.

6. A method for calculating the UPS load runnable time according to claim 5, characterized in that: In step S3, the steps of geometric ratio calculation are as follows: A1. List the first equation: A2, write the second equation: T2*Te*Pe-T1*T2*P1-T1*Te*Pe+T1*T1*P1=T2*Te*P2-T1*Te*P1-T1*T2*P2+T1*T1*P1 A3. Write down the third equation: T2*Te*Pe-T1*T2TP1-T1*Te*Pe=T2*Te*P2-T1*Te*P1-T1*T2*P2 A4. Write down the fourth equation: T1*T2*P2-T1*T2*P1=T2*Te*P2-T1*Te*P1-T2*Te*Pe+T1*Te*Pe A5. Write down the fifth equation: T1*T2*(P2-P1)=Te*(T2*P2-T1*P1-T2*Pe+T1*Pe) A6. Calculate the running time Te:

7. A method for calculating the UPS load operating time according to claim 6, characterized in that: The power value Pe is calculated by reverse calculation based on the running time Te to verify the accuracy of the geometric ratio method. The calculation formula for the reverse calculation of the power value Pe is:

8. The method for calculating the UPS load operating time according to claim 2, characterized in that: The rectifier rectifies the input AC and converts it into DC by using thyristor or IGBT electronic components, and then outputs the converted DC through a device to provide stable DC.

9. A method for calculating the UPS load-operable operating time according to claim 8, characterized in that: The storage battery is a battery pack composed of multiple individual batteries connected in series, and the rectifier is provided with a connector connected to the mains. When the mains is normal, the storage battery is charged through the rectifier and the electrical energy is converted into chemical energy for storage. When the mains fails, the storage battery converts the chemical energy back into electrical energy to supply the inverter or directly supply power to the emergency load.

10. A method for calculating the UPS load operating time according to claim 9, characterized in that: The static switch is configured as a contactless switch. The static switch is formed by reverse parallel thyristors. The static switch is controlled to close and open by a logic controller to complete automatic switching from city power to battery backup power supply.

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