A high power quality ups power supply

Abstract

The application relates to the field of UPS power supply monitoring management, and particularly discloses a high-power-quality UPS power supply, which identifies the type and priority of a new load connected to the UPS power supply, analyzes the adaptive connection power supply and adaptive connection phase of the new load connected to the UPS power supply, and connects through an intelligent power distribution switch; further, the load rate of the UPS power supply is monitored in real time, whether the UPS power supply has an overload risk is judged, and automatic load reduction is performed; meanwhile, the harmonic content of each phase of the UPS power supply is monitored, whether the load connected to each phase of the UPS power supply needs to be adjusted is judged, and redistribution is performed; through scientific and reasonable load management and phase matching, the output power quality of the UPS power supply is significantly improved; through real-time monitoring and intelligent early warning on the running state of the internal core circuit of the UPS power supply, potential faults of the internal core circuit of the UPS power supply can be identified, and intervention measures can be taken in advance, thereby providing safe, continuous and high-quality power support.

Description

Technical Field

[0001] The present invention relates to the field of UPS power supply monitoring and management, and in particular to a UPS power supply with high power quality. Background Art

[0002] An uninterruptible power supply (UPS) is a power protection device that provides a continuous and stable power supply to critical loads. Its core function is to ensure zero-switching power supply continuity through a built-in energy storage device when the mains power is abnormal or interrupted. At the same time, it suppresses voltage fluctuations, frequency deviations, and harmonic interference in the power grid through filtering and voltage stabilization.

[0003] With the increasing demand for power supply reliability and purity in modern industries, healthcare, data centers, and other fields, the power quality of UPS power supplies has become a core performance indicator. Poor UPS power quality can cause malfunctions in precision electronic equipment, communication signal distortion, or data loss, at best. In severe cases, it can cause production line downtime, medical equipment failure, or even the paralysis of critical infrastructure, resulting in irreversible economic losses and safety risks.

[0004] Therefore, improving the power quality control capability of UPS power supply through technological innovation has significant engineering value and social significance for ensuring the safe operation of modern power-sensitive loads and reducing system operation and maintenance costs.

[0005] However, existing methods for improving the power quality of UPS power supplies mostly involve optimizing the performance of the UPS power supply itself through hardware design, such as adding topological structures or functional circuits to the UPS power supply. For example, the existing Chinese patent publication number CN108123537A discloses a UPS power control system based on a delta converter, which proposes a new control method and topological structure, and realizes the instantaneous reactive power compensation function and DC side energy balance control function of the delta converter. The delta conversion UPS power supply has the dual functions of uninterruptible power supply and power quality compensation, and can provide stable and efficient power to the load. As a power quality compensator, the delta conversion UPS power supply can compensate for the harmonic components, unbalanced components, and reactive components contained in the power grid and the load.

[0006] For example, the existing Chinese patent publication number CN110350652A discloses a multi-machine parallel UPS system based on photovoltaic power generation. It uses a Swiss rectifier circuit to modulate the current waveform on the power supply side into a sine wave, thereby improving the power factor, reducing harmonics to about 10%, reducing harmonic pollution, and significantly improving power quality.

[0007] However, the existing methods do not take into account that in reality, in addition to the performance of the UPS power supply itself, there are other factors that may affect the power quality of the UPS power supply, and that other methods and approaches can also improve the power quality of the UPS power supply. For example, in terms of load management and matching, too many nonlinear loads connected to the same UPS power supply or the UPS power supply is in an overloaded operating state for a long time will affect the power quality. For example, the operating state of the working circuit that determines the output quality of the UPS power supply, abnormal operation of circuits such as the inverter circuit and the output filter circuit will directly affect the power quality output by the UPS power supply. Summary of the Invention

[0008] In view of the above problems, the present invention proposes a UPS power supply with high power quality, which realizes the function of monitoring and managing the UPS power supply.

[0009] The technical solution adopted by the present invention to solve its technical problems is: the present invention provides a UPS power supply with high power quality, including: a load type identification and preliminary access module: used to identify the type and priority of the newly connected load of each UPS power supply in the UPS power supply group, where the type includes non-linear load and linear load, further analyze the adapted access power supply and adapted access phase of each newly connected load of the UPS power supply, and access them through an intelligent distribution switch.

[0010] Overload monitoring and automatic load reduction module: used to monitor the load rate of each UPS power supply in the UPS power supply group in real time, determine whether each UPS power supply has an overload risk, and automatically reduce the load.

[0011] Periodic patrol load distribution module: used to set the monitoring period of load patrol, obtain the harmonic content of each phase of each UPS power supply in the UPS power supply group during the monitoring period, determine whether the load connected to each phase of each UPS power supply needs to be adjusted, and redistribute it.

[0012] Power supply internal circuit operation monitoring and early warning module: used to monitor the operating parameters of the internal circuits of each UPS power supply in the UPS power supply group in real time, where the internal circuits include rectifier circuits, inverter circuits, static switch circuits and filter circuits, to determine whether the internal circuits of each UPS power supply in the UPS power supply group are operating abnormally and issue early warnings.

[0013] Database: used to store the load priority comparison table and the evaluation indicators of the UPS power supply internal circuit operating parameters.

[0014] Compared with the prior art, the UPS power supply with high power quality described in the present invention has the following beneficial effects: 1. The present invention connects the newly connected loads by identifying the type and priority of the UPS power supply, analyzing the connected power source and connected phase adapted to each newly connected load of the UPS power supply; monitoring the load rate of the UPS power supply in real time to determine whether there is an overload risk and automatically reduce the load; monitoring the harmonic content of each phase of the UPS power supply to determine whether the loads connected to each phase of the UPS power supply need to be adjusted and redistributed; and then realizing scientific and reasonable load management and phase matching, preventing abnormal equipment shutdown due to overload tripping or harmonic superposition, thereby ensuring high-quality power supply.

[0015] 2. The present invention monitors the operating parameters of the internal circuit of the UPS power supply, determines whether the internal circuit of the UPS power supply is operating abnormally, and issues an early warning, thereby realizing real-time monitoring and intelligent early warning of the operating status of the core circuit inside the UPS power supply, which is conducive to dynamically identifying potential faults in the core circuit inside the UPS power supply and taking intervention measures in advance, thereby improving the power supply reliability of the UPS and providing safe, continuous and high-quality power support. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for describing the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0017] Figure 1 This is a system module connection diagram of the present invention.

[0018] Figure 2 This is a composition diagram of the power supply internal circuit operation monitoring and early warning module of the present invention.

[0019] Figure 3 This is a schematic diagram of the internal circuit structure of the UPS power supply of the present invention. DETAILED DESCRIPTION

[0020] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative efforts shall fall within the scope of protection of the present invention.

[0021] See also Figure 1As shown, the present invention provides a UPS power supply with high power quality, including a load type identification and preliminary access module, an overload monitoring and automatic load reduction module, a periodic patrol load distribution module, a power supply internal circuit operation monitoring and early warning module, and a database.

[0022] The overload monitoring and automatic load reduction module is respectively connected to the load type identification and preliminary access module and the periodic patrol load distribution module, the power supply internal circuit operation monitoring and early warning module is connected to the periodic patrol load distribution module, and the database is respectively connected to the load type identification and preliminary access module and the power supply internal circuit operation monitoring and early warning module.

[0023] The load type identification and preliminary access module is used to identify the type and priority of the newly connected load of each UPS power supply in the UPS power supply group, where the type includes non-linear load and linear load, further analyze the adaptive access power supply and adaptive access phase of each newly connected load of the UPS power supply, and access them through the intelligent distribution switch.

[0024] Furthermore, the load type identification and preliminary access module identifies the type and priority of each newly connected load of each UPS power supply in the UPS power supply group. The specific working process is: obtaining the current waveform of each newly connected load of each UPS power supply in the UPS power supply group, analyzing the current waveform of each newly connected load of each UPS power supply through fast Fourier transform technology, calculating the total harmonic distortion rate of each newly connected load of each UPS power supply, and measuring the power factor of each newly connected load of each UPS power supply, and analyzing the nonlinear trend coefficient of each newly connected load of each UPS power supply.

[0025] The nonlinear trend coefficient of the newly connected load of each UPS power supply is compared with the preset nonlinear trend coefficient threshold. If the nonlinear trend coefficient of the newly connected load of a UPS power supply is greater than or equal to the preset nonlinear trend coefficient threshold, then the newly connected load of the UPS power supply is a nonlinear load; otherwise, the newly connected load of the UPS power supply is a linear load, thereby identifying the type of the newly connected load of each UPS power supply in the UPS power supply group.

[0026] As a preferred solution, using fast Fourier transform to analyze the load current waveform and calculate the total harmonic distortion rate is an existing relatively mature technical means and will not be described in detail here.

[0027] As a preferred solution, the nonlinear trend coefficient of each UPS power supply newly connected load is analyzed. The specific method is: the total harmonic distortion rate of each UPS power supply newly connected load is recorded as , Indicates the The number of the new load connected to the UPS power supply, , and measure the power factor of each UPS power supply newly connected load, and record it as .

[0028] Total harmonic distortion of each UPS power supply newly connected to the load and power factor Substitute the analysis formula to obtain the nonlinear tendency coefficient of each UPS power supply newly connected to the load , wherein represents a correction factor of the preset nonlinear tendency coefficient, represents a limit value of the preset total harmonic distortion for distinguishing the linear load from the nonlinear load, represents a natural constant, represents a limit value of the preset power factor for distinguishing the linear load from the nonlinear load.

[0029] It needs to be explained that the total harmonic distortion and the power factor of the load are two major factors in the index for evaluating whether the connected load is nonlinear. First, the total harmonic distortion and the power factor of different dimensions are normalized, and the normalized and are the ratios of the total harmonic distortion and the power factor to the limit value, respectively. The in the formula directly reflects the contribution of the harmonic distortion to the nonlinearity, and the greater the ratio, the stronger the nonlinear tendency. The exponential term is used to represent the attenuation effect when the power factor deviates from the linear limit. When that is, when the power factor is low and close to the nonlinear characteristic, the exponential term increases, and the nonlinear weight is amplified after the square root operation, and vice versa. The overall sensitivity is adjusted by the correction factor to adapt to different scene requirements. The preset limit value of the total harmonic distortion for distinguishing the linear load from the nonlinear load and the limit value of the power factor for distinguishing the linear load from the nonlinear load are set by the human in the initial system operation, and in the embodiment, the is 5%, and the is 0.9.

[0030] Through the collected multiple sets of specific numerical data of the total harmonic distortion and the power factor of each UPS power supply newly connected to the load, and through the nonlinear tendency coefficient of each UPS power supply newly connected to the load calculation formula, a feasible simulation process is obtained. Assuming that it is a single UPS power supply newly connected to the load, the correction factor of the nonlinear tendency coefficient , and the threshold of the nonlinear tendency coefficient is 1.7, the simulation result can be obtained. For details, refer to Table 1, in which some representative data (linear load data and nonlinear load data) are listed.

[0031] Table 1. Some collected total harmonic distortion data, power factor data and calculation results

[0032]

[0033] Through the above simulation calculation, in Group 1, the total harmonic distortion rate of the newly connected load of the UPS power supply is greater than the corresponding limit value, the power factor is less than the corresponding limit value, and the nonlinear trend coefficient is greater than the threshold value of the nonlinear trend coefficient, that is, the newly connected load of the UPS power supply is judged to be a nonlinear load; in Group 2, the total harmonic distortion rate of the newly connected load of the UPS power supply is less than the corresponding limit value, the power factor is greater than the corresponding limit value, and the nonlinear trend coefficient is less than the threshold value of the nonlinear trend coefficient, that is, the newly connected load of the UPS power supply is judged to be a linear load.

[0034] As a preferred solution, the correction factor of the nonlinear trend coefficient plays the role of amplifying, reducing or rounding the nonlinear trend coefficient to facilitate calculation and analysis.

[0035] As a preferred embodiment, the total harmonic distortion (THD) threshold for distinguishing linear loads from nonlinear loads is defined as a load that is nonlinear when its THD is greater than or equal to the threshold, and as a load that is linear when its THD is less than the threshold. In one specific embodiment, the THD threshold for distinguishing linear loads from nonlinear loads is 5%, meaning that a load that is nonlinear when its THD is greater than or equal to 5% is considered a THD, and a load that is linear when its THD is less than 5%.

[0036] As a preferred embodiment, the power factor threshold for distinguishing linear loads from nonlinear loads is defined as a load that is nonlinear when its power factor is less than or equal to the threshold, and a load that is linear when its power factor is greater than the threshold. In one specific embodiment, the power factor threshold for distinguishing linear loads from nonlinear loads is 0.9, i.e., a load that is nonlinear when its power factor is less than or equal to 0.9 and a load that is linear when its power factor is greater than 0.9.

[0037] It should be noted that nonlinear loads usually have higher total harmonic distortion and lower power factor.

[0038] As a preferred solution, non-linear loads include but are not limited to computers, servers, inverters, etc. Non-linear loads will generate harmonics and affect the power quality of the UPS power supply.

[0039] In another specific embodiment, a built-in machine learning model is used to train a classifier based on historical data to identify load types.

[0040] Extract the load priority comparison table stored in the database and filter out the priority of the newly connected load of each UPS power supply in the UPS power supply group.

[0041] As a preferred solution, the priority level corresponding to each load in the load priority comparison table is set according to actual application requirements.

[0042] In another specific embodiment, the priority of the load is input when the load is connected to the UPS power supply.

[0043] Furthermore, the load type identification and preliminary access module analyzes the adaptive access power supply of the newly connected load of each UPS power supply, and the specific working process is: A1: Obtain the current load rate of each UPS power supply in the UPS power supply group. If the load rate of a UPS power supply does not reach the set UPS power supply load rate threshold after the new load is connected, then the UPS power supply is the adaptive access power supply for the newly connected load of the UPS power supply. If the load rate of a UPS power supply reaches the set UPS power supply load rate threshold after the new load is connected, then the UPS power supply is not the adaptive access power supply for the newly connected load of the UPS power supply, and execute A2.

[0044] As a preferred option, the UPS load factor refers to the ratio of the actual load power provided by the UPS to the rated power of the UPS, usually expressed as a percentage. For example, if a UPS is rated for 10kVA and actually provides 6kVA of power to the load, the UPS load factor is 60%.

[0045] In a specific embodiment, the UPS power load rate threshold is set to 85%.

[0046] A2: Obtain the current load rate of all UPS power supplies in the UPS power group except the UPS power supply. If the load rate of a UPS power supply other than the UPS power supply in the UPS power group does not reach the set UPS power load rate threshold after the new load is connected to the UPS power supply, then record the other UPS power supply as a substitute UPS power supply for the UPS power supply, and screen the substitute UPS power supplies for the UPS power supply.

[0047] Obtain the current load rate of each backup UPS power supply of the UPS power supply, and sort them in descending order according to the load rate, and use the backup UPS power supply ranked first as the adaptive access power supply for the new load connected to the UPS power supply.

[0048] Furthermore, the load type identification and preliminary access module analyzes the adaptive access phase of each newly connected load of the UPS power supply. The specific working process is: if the newly connected load of a UPS power supply is a linear load, then according to the preset principle, a phase is selected from the various phases of the adaptive access power supply of the newly connected load of the UPS power supply as the adaptive access phase of the newly connected load of the UPS power supply.

[0049] If the newly connected load of a UPS power supply is a non-linear load, obtain the number of non-linear loads currently connected to each phase of the adaptive access power supply of the new load of the UPS power supply; if the number of non-linear loads connected to a certain phase of the adaptive access power supply after adding the new load does not reach the set threshold number of non-linear loads connected to a single phase, then the phase of the adaptive access power supply is recorded as an optional phase; if the number of non-linear loads connected to a certain phase of the adaptive access power supply after adding the new load reaches the set threshold number of non-linear loads connected to a single phase, then the phase of the adaptive access power supply is recorded as an unselectable phase, and the optional phases of the adaptive access power supply of the new load of the UPS power supply are screened.

[0050] Obtain the number of non-linear loads connected to each optional phase in the adaptive access power supply of the new load connected to the UPS power supply, and sort them in descending order according to the number of connected non-linear loads, and use the optional phase that ranks first in the adaptive access power supply as the adaptive access phase of the new load connected to the UPS power supply.

[0051] Then obtain the adaptive access phase of each UPS power supply newly connected load.

[0052] In a specific embodiment, the threshold value of the number of non-linear loads connected to a single phase in the adapted power supply for a newly connected load of the UPS power supply is 3.

[0053] As a preferred solution, the intelligent power distribution switch is divided into two levels, wherein the first-level power distribution switch is used to select the UPS power supply to which the load is connected, and the second-level power distribution switch is used to select the phase of the UPS power supply to which the load is connected.

[0054] The overload monitoring and automatic load reduction module is used to monitor the load rate of each UPS power supply in the UPS power supply group in real time, determine whether each UPS power supply has an overload risk, and automatically reduce the load.

[0055] Furthermore, the specific working process of the overload monitoring and automatic load reduction module is: B1: real-time monitoring of the load rate of each UPS power supply in the UPS power supply group. If the load rate of a UPS power supply at a certain moment is greater than the set UPS power supply load rate threshold and the duration is greater than the set duration, then the UPS power supply is at risk of overload and B2 is executed. Otherwise, the UPS power supply is not at risk of overload.

[0056] B2: Obtain the priority of each load connected to the UPS power supply, and disconnect each load connected to the UPS power supply in descending order of priority until the UPS power supply is no longer overloaded.

[0057] In a specific embodiment, if the load rate of a UPS power supply exceeds 85% for 10 minutes, the lowest priority load of the UPS power supply is automatically cut off.

[0058] The periodic patrol load distribution module is used to set the monitoring period of load patrol, obtain the harmonic content of each phase of each UPS power supply in the UPS power supply group during the monitoring period, determine whether the load connected to each phase of each UPS power supply needs to be adjusted, and redistribute it.

[0059] Furthermore, the specific working process of the periodic patrol load distribution module is as follows: C1: setting the monitoring period of the load patrol according to the preset principle, detecting the harmonic content of each phase of each UPS power supply in the UPS power group during the monitoring period, if the harmonic content of a certain phase of a certain UPS power supply in the UPS power group during the monitoring period is greater than the set harmonic content threshold, then the load connected to the phase of the UPS power supply needs to be adjusted, and C2 is executed; otherwise, the load connected to the phase of the UPS power supply does not need to be adjusted.

[0060] C2: Obtain the non-linear loads connected to the phase of the UPS power supply and the priority of each non-linear load, record the non-linear load with the lowest priority connected to the phase of the UPS power supply as the removed load, and distribute the removed load of the phase of the UPS power supply to other phases with the lowest harmonic content in the UPS power supply, and then redistribute the loads connected to each phase of the UPS power supply.

[0061] As a preferred solution, the harmonic content of each phase of each UPS power supply in the UPS power supply group during the monitoring period refers to the maximum harmonic content of each phase of each UPS power supply in the UPS power supply group during the monitoring period.

[0062] It should be noted that the present invention connects the newly connected loads by identifying the type and priority of the UPS power supply, analyzing the connected power supply and connected phase adapted to each newly connected load of the UPS power supply; monitoring the load rate of the UPS power supply in real time to determine whether there is an overload risk and automatically reduce the load; monitoring the harmonic content of each phase of the UPS power supply to determine whether the loads connected to each phase of the UPS power supply need to be adjusted and redistributed; and thus achieving scientific and reasonable load management and phase matching, preventing abnormal equipment shutdowns due to overload tripping or harmonic superposition, thereby ensuring high-quality power supply.

[0063] The power supply internal circuit operation monitoring and early warning module is used to monitor the operating parameters of the internal circuits of each UPS power supply in the UPS power supply group in real time, where the internal circuits include rectifier circuits, inverter circuits, static switch circuits and filter circuits, to determine whether the internal circuits of each UPS power supply in the UPS power supply group are operating abnormally and issue an early warning.

[0064] Further, see Figure 2 As shown, the power supply internal circuit operation monitoring and early warning module includes a rectifier circuit monitoring and early warning unit, an inverter circuit monitoring and early warning unit, a static switch circuit monitoring and early warning unit and a filter circuit monitoring and early warning unit, wherein the specific working process of the rectifier circuit monitoring and early warning unit is as follows: Figure 3 As shown, the voltage fluctuation rate and temperature of the rectifier circuit in each UPS power supply in the UPS power supply group are monitored in real time through the acquisition circuit corresponding to the built-in rectifier circuit of each UPS power supply in the UPS power supply group, and the evaluation index of the UPS power supply internal circuit operation parameter stored in the database is extracted to obtain the threshold values ​​of the voltage fluctuation rate and temperature of the rectifier circuit in the UPS power supply, and the voltage fluctuation rate and temperature of the rectifier circuit in each UPS power supply in the UPS power supply group are compared with the corresponding threshold values ​​respectively to obtain the overshoot of the voltage fluctuation rate and temperature of the rectifier circuit in each UPS power supply in the UPS power supply group, and the overshoot is substituted into the relationship function between the voltage fluctuation rate overshoot and temperature overshoot of the rectifier circuit and the abnormal operation coefficient of the rectifier circuit to obtain the abnormal operation coefficient of the rectifier circuit in each UPS power supply in the UPS power supply group.

[0065] The operation abnormality coefficient of the rectifier circuit in each UPS power supply in the UPS power supply group is compared with the preset rectifier circuit operation abnormality coefficient limit. If the operation abnormality coefficient of the rectifier circuit in a UPS power supply in the UPS power supply group is greater than the limit, the rectifier circuit in the UPS power supply is operating abnormally and an early warning is issued.

[0066] As a preferred solution, the rectifier circuit in the UPS power supply converts the input AC power into DC power, providing a stable DC bus voltage for the inverter and battery charging.

[0067] As a preferred solution, the voltage fluctuation rate of the rectifier circuit refers to the DC bus voltage fluctuation rate.

[0068] As a preferred solution, the temperature of the rectifier circuit refers to the rectifier temperature.

[0069] As a preferred solution, the relationship function between the voltage fluctuation rate overshoot, temperature overshoot and rectifier circuit operation abnormality coefficient of the rectifier circuit is a positive correlation function, that is, the greater the voltage fluctuation rate overshoot and the temperature overshoot, the greater the rectifier circuit operation abnormality coefficient.

[0070] In a specific embodiment, the calculation formula of the rectifier circuit operation abnormality coefficient is: ,in Indicates the abnormal operation coefficient of the rectifier circuit, Respectively represent the voltage fluctuation rate overshoot and temperature overshoot, They represent the preset voltage fluctuation rate overshoot threshold and temperature overshoot threshold respectively. Respectively represent the weights of the preset voltage fluctuation rate overshoot and temperature overshoot, , , .

[0071] Furthermore, the specific working process of the inverter circuit monitoring and early warning unit is: through the acquisition circuit corresponding to the inverter circuit built into each UPS power supply in the UPS power supply group, the output voltage fluctuation rate, output frequency offset, and efficiency reduction of the inverter circuit in each UPS power supply in the UPS power supply group are monitored in real time, and the overshoot of the output voltage fluctuation rate, output frequency offset, and efficiency reduction of the inverter circuit in each UPS power supply in the UPS power supply group is analyzed, and substituted into the preset relationship function between the output voltage fluctuation rate, output frequency offset, and efficiency reduction overshoot of the inverter circuit and the inverter circuit operation abnormality coefficient, so as to obtain the operation abnormality coefficient of the inverter circuit in each UPS power supply in the UPS power supply group.

[0072] As a preferred solution, evaluation indicators of UPS power supply internal circuit operating parameters stored in a database are extracted to obtain threshold values ​​of the output voltage fluctuation rate, output frequency offset, and efficiency reduction of the inverter circuit in the UPS power supply. The output voltage fluctuation rate, output frequency offset, and efficiency reduction of the inverter circuit in each UPS power supply in the UPS power supply group are compared with their corresponding threshold values ​​to obtain overshoot of the output voltage fluctuation rate, output frequency offset, and efficiency reduction of the inverter circuit in each UPS power supply in the UPS power supply group.

[0073] The operation abnormality coefficient of the inverter circuit in each UPS power supply in the UPS power supply group is compared with the preset inverter circuit operation abnormality coefficient limit. If the operation abnormality coefficient of the inverter circuit in a UPS power supply in the UPS power supply group is greater than the limit, the inverter circuit in the UPS power supply is operating abnormally and an early warning is issued.

[0074] As a preferred solution, the output voltage fluctuation rate of the inverter circuit refers to the ratio of the amount by which the output voltage deviates from the rated value to the rated value.

[0075] As a preferred solution, the efficiency drop of the inverter circuit refers to the efficiency drop of the inverter.

[0076] As a preferred solution, the inverter circuit in the UPS power supply converts direct current into stable, pure alternating current output.

[0077] As a preferred solution, the relationship function between the output voltage fluctuation rate, output frequency offset, overshoot of the efficiency drop of the inverter circuit and the inverter circuit operation abnormality coefficient is a positive correlation function, that is, the greater the overshoot of the output voltage fluctuation rate, the greater the overshoot of the output frequency offset, and the greater the overshoot of the efficiency drop, the greater the inverter circuit operation abnormality coefficient.

[0078] In a specific embodiment, the calculation formula of the inverter circuit operation abnormality coefficient is: ,in Indicates the abnormal operation coefficient of the inverter circuit, They represent the overshoot of output voltage fluctuation rate, output frequency offset and efficiency drop respectively. They respectively represent the threshold value of the overshoot of the output voltage fluctuation rate, the threshold value of the overshoot of the output frequency offset, and the threshold value of the overshoot of the efficiency drop.

[0079] Furthermore, the specific working process of the static switch circuit monitoring and early warning unit is: through the acquisition circuit corresponding to the static switch circuit built into each UPS power supply in the UPS power supply group, the switching time, contact resistance increase, and switching transient overvoltage ratio of the static switch circuit in each UPS power supply in the UPS power supply group are monitored in real time, and the switching time, contact resistance increase, and overshoot of the switching transient overvoltage ratio of the static switch circuit in each UPS power supply in the UPS power supply group are analyzed, and substituted into the preset relationship function between the switching time, contact resistance increase, overshoot of the switching transient overvoltage ratio and the static switch circuit operation abnormality coefficient to obtain the operation abnormality coefficient of the static switch circuit in each UPS power supply in the UPS power supply group.

[0080] As a preferred solution, evaluation indicators of the internal circuit operating parameters of the UPS power supply stored in the database are extracted to obtain the switching time, contact resistance increase, and switching transient overvoltage ratio thresholds of the static switch circuit in the UPS power supply. The switching time, contact resistance increase, and switching transient overvoltage ratio of the static switch circuit in each UPS power supply in the UPS power supply group are compared with their corresponding thresholds to obtain the switching time, contact resistance increase, and switching transient overvoltage ratio overshoot of the static switch circuit in each UPS power supply in the UPS power supply group.

[0081] Compare the operation abnormality coefficient of the static switch circuit in each UPS power supply in the UPS power supply group with the preset operation abnormality coefficient limit of the static switch circuit. If the operation abnormality coefficient of the static switch circuit in a UPS power supply in the UPS power supply group is greater than the limit, the static switch circuit in the UPS power supply is operating abnormally and an early warning is issued.

[0082] As a preferred solution, the increase in the contact resistance of the static switch circuit refers to the amount by which the contact resistance of the static switch circuit exceeds its normal value.

[0083] As a preferred solution, the switching transient overvoltage ratio of the static switch circuit refers to the ratio between the amount by which the switching transient voltage exceeds the rated value and the rated value.

[0084] As a preferred solution, the static switch circuit in the UPS power supply quickly switches to the bypass power supply when the main circuit fails.

[0085] As a preferred solution, the relationship function between the switching time of the static switching circuit, the increase in contact resistance, the overshoot of the switching transient overvoltage ratio and the static switching circuit operation abnormality coefficient is a positive correlation function, that is, the greater the overshoot of the switching time of the static switching circuit, the greater the overshoot of the contact resistance increase, and the greater the overshoot of the switching transient overvoltage ratio, the greater the static switching circuit operation abnormality coefficient.

[0086] In a specific embodiment, the calculation formula of the static switch circuit operation abnormality coefficient is: ,in Indicates the abnormal operation coefficient of the static switch circuit, They represent the switching time, contact resistance increase, and overshoot of the switching transient overvoltage ratio, respectively. They respectively represent the threshold value of the overshoot of the preset switching time, the threshold value of the overshoot of the contact resistance increase, and the threshold value of the overshoot of the switching transient overvoltage ratio.

[0087] Furthermore, the specific working process of the filter circuit monitoring and early warning unit is: through the acquisition circuit corresponding to the built-in filter circuit of each UPS power supply in the UPS power supply group, the output harmonic content increase number, common mode noise increase, and heat generation of the filter circuit in each UPS power supply in the UPS power supply group are monitored in real time, and the output harmonic content increase number, common mode noise increase, and heat generation overshoot of the filter circuit in each UPS power supply in the UPS power supply group are analyzed, and the results are substituted into the preset relationship function between the output harmonic content increase number, common mode noise increase, heat generation overshoot of the filter circuit and the filter circuit operation abnormality coefficient to obtain the operation abnormality coefficient of the filter circuit in each UPS power supply in the UPS power supply group.

[0088] As a preferred solution, the evaluation indexes of the running parameters of the internal circuit of the UPS are extracted from the database to obtain the threshold values of the output harmonic content increase times, the common mode noise increase amount and the heat amount of the internal filter circuit of the UPS, and the output harmonic content increase times, the common mode noise increase amount and the heat amount of each internal filter circuit of the UPS in the UPS group are compared with the corresponding threshold values to obtain the overshoots of the output harmonic content increase times, the common mode noise increase amount and the heat amount of each internal filter circuit of the UPS in the UPS group.

[0089] The running abnormality coefficients of the internal filter circuits of the UPS in the UPS group are compared with the preset limit values of the filter circuit running abnormality coefficients, and if the running abnormality coefficient of the internal filter circuit of a certain UPS in the UPS group is greater than the limit value, the internal filter circuit of the UPS is abnormal and a pre-warning is given.

[0090] As a preferred solution, the internal filter circuit of the UPS filters out high-frequency harmonics and electromagnetic interference.

[0091] As a preferred solution, the relationship function between the overshoots of the output harmonic content increase times, the common mode noise increase amount and the heat amount of the filter circuit and the filter circuit running abnormality coefficient is a positive correlation function, that is, the greater the overshoot of the output harmonic content increase times, the greater the overshoot of the common mode noise increase amount, the greater the overshoot of the heat amount, and the greater the filter circuit running abnormality coefficient.

[0092] In one specific embodiment, the calculation formula of the filter circuit running abnormality coefficient is , wherein represents the filter circuit running abnormality coefficient, represents the overshoots of the output harmonic content increase times, the common mode noise increase amount and the heat amount, respectively, represents the threshold values of the overshoots of the output harmonic content increase times, the common mode noise increase amount and the heat amount, respectively.

[0093] It should be noted that the present application monitors the running parameters of the internal circuit of the UPS, judges whether the internal circuit of the UPS is abnormal, and gives a pre-warning, realizes real-time monitoring and intelligent pre-warning of the running state of the internal core circuit of the UPS, is beneficial to dynamically identifying potential faults of the internal core circuit of the UPS and taking intervention measures in advance, and further improves the UPS power supply reliability and provides safe, continuous and high-quality power support.

[0094] The database is used to store a load priority table and store evaluation indexes of running parameters of an internal circuit of a UPS.

[0095] The above contents are merely examples and explanations of the concept of the present invention. Those skilled in the art may make various modifications or additions to the described specific embodiments or replace them in a similar manner. As long as they do not deviate from the concept of the invention or exceed the scope defined by the present invention, they should all fall within the scope of protection of the present invention.

Claims

1. A UPS power supply with high power quality, characterized in that: include: Load type identification and preliminary access module: used to identify the type and priority of the newly connected loads of each UPS power supply in the UPS power supply group, where the types include non-linear loads and linear loads, further analyze the adapted access power source and adapted access phase of each newly connected load of the UPS power supply, and connect them through the intelligent power distribution switch; Overload monitoring and automatic load reduction module: used to monitor the load rate of each UPS power supply in the UPS power supply group in real time, determine whether each UPS power supply has an overload risk, and automatically reduce the load; Periodic patrol load distribution module: used to set the monitoring period of load patrol, obtain the harmonic content of each phase of each UPS power supply in the UPS power supply group during the monitoring period, determine whether the load connected to each phase of each UPS power supply needs to be adjusted, and redistribute it; Power supply internal circuit operation monitoring and early warning module: used to monitor the operating parameters of the internal circuits of each UPS power supply in the UPS power supply group in real time, where the internal circuits include rectifier circuits, inverter circuits, static switch circuits and filter circuits, to determine whether the internal circuits of each UPS power supply in the UPS power supply group are operating abnormally and issue early warnings; Database: used to store the load priority comparison table and the evaluation indicators of the UPS power supply internal circuit operating parameters; The overload monitoring and automatic load reduction module is respectively connected to the load type identification and preliminary access module and the periodic patrol load distribution module, the power supply internal circuit operation monitoring and early warning module is connected to the periodic patrol load distribution module, and the database is respectively connected to the load type identification and preliminary access module and the power supply internal circuit operation monitoring and early warning module.

2. A UPS power supply with high power quality according to claim 1, characterized in that: The load type identification and preliminary access module identifies the type and priority of the newly connected loads of each UPS power supply in the UPS power supply group. The specific working process is as follows: Obtain the current waveform of the newly connected load of each UPS power supply in the UPS power supply group, analyze the current waveform of each newly connected load of each UPS power supply using the fast Fourier transform technology, calculate the total harmonic distortion rate of each newly connected load of each UPS power supply, measure the power factor of each newly connected load of each UPS power supply, and analyze the nonlinear trend coefficient of each newly connected load of each UPS power supply; Compare the nonlinear trend coefficient of the newly connected load of each UPS power supply with the preset nonlinear trend coefficient threshold value. If the nonlinear trend coefficient of the newly connected load of a UPS power supply is greater than or equal to the preset nonlinear trend coefficient threshold value, the newly connected load of the UPS power supply is a nonlinear load; otherwise, the newly connected load of the UPS power supply is a linear load, thereby identifying the type of the newly connected load of each UPS power supply in the UPS power supply group; Extract the load priority comparison table stored in the database and filter out the priority of the newly connected load of each UPS power supply in the UPS power supply group.

3. A UPS power supply with high power quality according to claim 1, characterized in that: The load type identification and preliminary access module analyzes the adaptive access power supply of each newly connected load of the UPS power supply. The specific working process is as follows: A1: Obtain the current load rate of each UPS power supply in the UPS power supply group. If the load rate of a UPS power supply does not reach the set UPS power supply load rate threshold after a new load is connected to the UPS power supply, the UPS power supply is the adapted access power supply for the new load. If the load rate of a UPS power supply reaches the set UPS power supply load rate threshold after a new load is connected to the UPS power supply, the UPS power supply is not the adapted access power supply for the new load, and execute A2. A2: Obtain the current load rate of each UPS power supply in the UPS power supply group except the UPS power supply. If the load rate of a UPS power supply in the UPS power supply group except the UPS power supply does not reach the set UPS power supply load rate threshold after the new load is connected to the UPS power supply, then record the other UPS power supply as a backup UPS power supply for the UPS power supply, and screen the backup UPS power supplies for the UPS power supply; Obtain the current load rate of each backup UPS power supply of the UPS power supply, and sort them in descending order according to the load rate, and use the backup UPS power supply ranked first as the adaptive access power supply for the new load connected to the UPS power supply.

4. A UPS power supply with high power quality according to claim 1, characterized in that: The load type identification and preliminary access module analyzes the adaptation access phase of each UPS power supply newly connected load. The specific working process is as follows: If the newly connected load of a UPS power supply is a linear load, a phase is selected from the phases of the adaptive access power supply of the newly connected load of the UPS power supply according to a preset principle as the adaptive access phase of the newly connected load of the UPS power supply; If the newly connected load of a UPS power supply is a non-linear load, obtain the number of non-linear loads currently connected to each phase of the adaptive access power supply of the newly connected load of the UPS power supply; if the number of non-linear loads connected to a certain phase of the adaptive access power supply after adding the newly connected load does not reach the set single-phase connected non-linear load number threshold, then the phase of the adaptive access power supply is recorded as an optional phase; if the number of non-linear loads connected to a certain phase of the adaptive access power supply after adding the new load reaches the set single-phase connected non-linear load number threshold, then the phase of the adaptive access power supply is recorded as an unselectable phase, and the optional phases of the adaptive access power supply of the newly connected load of the UPS power supply are screened; Obtain the number of non-linear loads connected to each optional phase in the adaptive access power supply of the new load connected to the UPS power supply, sort them in descending order according to the number of connected non-linear loads, and use the optional phase that ranks first in the adaptive access power supply as the adaptive access phase for the new load connected to the UPS power supply; Then obtain the adaptive access phase of each UPS power supply newly connected load.

5. The UPS power supply with high power quality according to claim 1, characterized in that: The specific working process of the overload monitoring and automatic load reduction module is as follows: B1: Monitor the load rate of each UPS power supply in the UPS power supply group in real time. If the load rate of a UPS power supply at a certain moment is greater than the set UPS power supply load rate threshold and the duration is greater than the set duration, the UPS power supply is at risk of overload and B2 is executed. Otherwise, the UPS power supply is not at risk of overload. B2: Obtain the priority of each load connected to the UPS power supply, and disconnect each load connected to the UPS power supply in descending order of priority until the UPS power supply is no longer overloaded.

6. A UPS power supply with high power quality according to claim 1, characterized in that: The specific working process of the periodic patrol load distribution module is as follows: C1: Set the load patrol monitoring cycle according to the preset principle, and detect the harmonic content of each phase of each UPS power supply in the UPS power supply group during the monitoring period. If the harmonic content of a certain phase of a UPS power supply in the UPS power supply group during the monitoring period is greater than the set harmonic content threshold, the load connected to the phase of the UPS power supply needs to be adjusted and C2 is executed. Otherwise, the load connected to the phase of the UPS power supply does not need to be adjusted; C2: Obtain the non-linear loads connected to the phase of the UPS power supply and the priority of each non-linear load, record the non-linear load with the lowest priority connected to the phase of the UPS power supply as the removed load, and distribute the removed load of the phase of the UPS power supply to other phases with the lowest harmonic content in the UPS power supply, and then redistribute the loads connected to each phase of the UPS power supply.

7. A UPS power supply with high power quality according to claim 1, characterized in that: The power supply internal circuit operation monitoring and early warning module includes a rectifier circuit monitoring and early warning unit, an inverter circuit monitoring and early warning unit, a static switch circuit monitoring and early warning unit, and a filter circuit monitoring and early warning unit. The specific working process of the rectifier circuit monitoring and early warning unit is as follows: By using the acquisition circuit corresponding to the built-in rectifier circuit of each UPS power supply in the UPS power supply group, the voltage fluctuation rate and temperature of the rectifier circuit in each UPS power supply in the UPS power supply group are monitored in real time, and the evaluation index of the UPS power supply internal circuit operation parameter stored in the database is extracted to obtain the threshold values ​​of the voltage fluctuation rate and temperature of the rectifier circuit in the UPS power supply group, and the voltage fluctuation rate and temperature of the rectifier circuit in each UPS power supply in the UPS power supply group are compared with the corresponding threshold values ​​respectively to obtain the overshoot of the voltage fluctuation rate and temperature of the rectifier circuit in each UPS power supply in the UPS power supply group, and the overshoot is substituted into the relationship function between the voltage fluctuation rate overshoot and the temperature overshoot of the rectifier circuit and the abnormal operation coefficient of the rectifier circuit of the preset UPS power supply group to obtain the abnormal operation coefficient of the rectifier circuit in each UPS power supply in the UPS power supply group; The operation abnormality coefficient of the rectifier circuit in each UPS power supply in the UPS power supply group is compared with the preset rectifier circuit operation abnormality coefficient limit. If the operation abnormality coefficient of the rectifier circuit in a UPS power supply in the UPS power supply group is greater than the limit, the rectifier circuit in the UPS power supply is operating abnormally and an early warning is issued.

8. A UPS power supply with high power quality according to claim 7, characterized in that: The specific working process of the inverter circuit monitoring and early warning unit is as follows: By using the acquisition circuit corresponding to the built-in inverter circuit of each UPS power supply in the UPS power supply group, the output voltage fluctuation rate, output frequency offset, and efficiency reduction of the inverter circuit in each UPS power supply in the UPS power supply group are monitored in real time, and the overshoot of the output voltage fluctuation rate, output frequency offset, and efficiency reduction of the inverter circuit in each UPS power supply in the UPS power supply group is analyzed. The overshoot is substituted into a preset relationship function between the output voltage fluctuation rate, output frequency offset, and efficiency reduction of the inverter circuit and the inverter circuit operation abnormality coefficient, so as to obtain the operation abnormality coefficient of the inverter circuit in each UPS power supply in the UPS power supply group; The operation abnormality coefficient of the inverter circuit in each UPS power supply in the UPS power supply group is compared with the preset inverter circuit operation abnormality coefficient limit. If the operation abnormality coefficient of the inverter circuit in a UPS power supply in the UPS power supply group is greater than the limit, the inverter circuit in the UPS power supply is operating abnormally and an early warning is issued.

9. A UPS power supply with high power quality according to claim 7, characterized in that: The specific working process of the static switch circuit monitoring and early warning unit is as follows: By using the acquisition circuit corresponding to the static switch circuit built into each UPS power supply in the UPS power supply group, the switching time, contact resistance increase, and switching transient overvoltage ratio of the static switch circuit in each UPS power supply in the UPS power supply group are monitored in real time, the switching time, contact resistance increase, and overshoot of the switching transient overvoltage ratio of the static switch circuit in each UPS power supply in the UPS power supply group are analyzed, and the overshoot is substituted into a preset relationship function between the switching time, contact resistance increase, overshoot of the switching transient overvoltage ratio and the static switch circuit operation abnormality coefficient, thereby obtaining the operation abnormality coefficient of the static switch circuit in each UPS power supply in the UPS power supply group; Compare the operation abnormality coefficient of the static switch circuit in each UPS power supply in the UPS power supply group with the preset operation abnormality coefficient limit of the static switch circuit. If the operation abnormality coefficient of the static switch circuit in a UPS power supply in the UPS power supply group is greater than the limit, the static switch circuit in the UPS power supply is operating abnormally and an early warning is issued.

10. A UPS power supply with high power quality according to claim 7, characterized in that: The specific working process of the filter circuit monitoring and early warning unit is as follows: By using the acquisition circuit corresponding to the built-in filter circuit of each UPS power supply in the UPS power supply group, the number of times the output harmonic content increases, the increase in common-mode noise, and the heat generation of the filter circuit in each UPS power supply in the UPS power supply group are monitored in real time, and the number of times the output harmonic content increases, the increase in common-mode noise, and the overshoot of the heat generation of the filter circuit in each UPS power supply in the UPS power supply group are analyzed. The overshoot is substituted into a preset relationship function between the number of times the output harmonic content increases, the increase in common-mode noise, and the overshoot of the heat generation of the filter circuit and the operation abnormality coefficient of the filter circuit, thereby obtaining the operation abnormality coefficient of the filter circuit in each UPS power supply in the UPS power supply group; The operation abnormality coefficient of the filter circuit in each UPS power supply in the UPS power supply group is compared with the preset filter circuit operation abnormality coefficient limit. If the operation abnormality coefficient of the filter circuit in a UPS power supply in the UPS power supply group is greater than the limit, the filter circuit in the UPS power supply is operating abnormally and an early warning is issued.

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