UPS (Uninterrupted Power Supply) with high electric energy quality

Abstract

The invention relates to the field of UPS monitoring and management, and particularly discloses a UPS with high power quality, which is characterized in that the type and priority of a newly accessed load of the UPS are identified, an adaptive access power supply and an adaptive access phase of the newly accessed load of the UPS are analyzed, and access is carried out through an intelligent power distribution switch; further monitoring the load rate of the UPS power supply in real time, judging whether the UPS power supply has an overload risk or not, and performing automatic load shedding; meanwhile, monitoring the harmonic content of each phase of the UPS power supply, judging whether the load connected to each phase of the UPS power supply needs to be adjusted or not, and redistributing the load; through scientific and reasonable load management and phase matching, the output power quality of the UPS power supply is obviously improved; through real-time monitoring and intelligent early warning of the operation 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 so that safe and continuous high-quality electric power support can be provided.

Description

Technical Field

[0001] The 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 is a power protection device that provides continuous and stable power supply to critical loads. Its core function is to achieve zero switching time power supply continuation 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, voltage stabilization and other links.

[0003] With the increasing requirements for power supply reliability and power purity in modern industry, medical treatment, data centers and other fields, the power quality of UPS power supply has become the core indicator to measure its performance. If the power quality of UPS output is poor, it may cause malfunction of precision electronic equipment, distortion of communication signals or data loss, or even cause production line shutdown, medical equipment failure or even paralysis of key 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, the existing methods for improving the power quality of UPS power supplies are mostly to optimize the performance of the UPS power supply itself by adding topological structures or functional circuits to the UPS power supply through hardware design: for example, the existing Chinese patent with publication number CN108123537A discloses a UPS power control system based on a Delta converter, 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 electric energy 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 with 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, improves the power factor, reduces harmonics to about 10%, reduces harmonic pollution, and significantly improves the power quality.

[0007] However, the existing methods do not take into account that in reality, there are other factors that may affect the power quality of the UPS power supply besides its own performance, and other methods can also improve the power quality of the UPS power supply. For example, in terms of load management and matching, connecting too many non-linear loads to the same UPS power supply or the UPS power supply being in an overloaded operation state for a long time will affect the power quality. Another example is the operating state of the working circuit that determines the power 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 of the UPS power supply output. Summary of the Invention

[0008] In view of the above problems, the present invention proposes a UPS power supply with high power quality to realize 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 types and priorities of newly connected loads of each UPS power supply in the UPS power supply group, where the types include non-linear loads and linear loads, and further analyze the suitable access power supply and suitable access phase of the newly connected loads of each UPS power supply, and access through an intelligent distribution switch.

[0010] An overload monitoring and automatic load shedding module: used to monitor the load rate of each UPS power supply in the UPS power supply group in real time, judge whether there is an overload risk for each UPS power supply, and perform automatic load shedding.

[0011] A periodic polling load distribution module: used to set the monitoring period of load polling, obtain the harmonic content of each phase of each UPS power supply in the UPS power supply group within the monitoring period, judge whether the loads connected to each phase of each UPS power supply need to be adjusted, and perform re-distribution.

[0012] A power supply internal circuit operation monitoring and early warning module: used to monitor the operation parameters of the internal circuits of each UPS power supply in the UPS power supply group in real time, where the internal circuits include a rectifier circuit, an inverter circuit, a static switch circuit, and a filter circuit, judge whether the operation of the internal circuits of each UPS power supply in the UPS power supply group is abnormal, and give an early warning.

[0013] A database: used to store a load priority comparison table and store the evaluation indexes of the operation parameters of the internal circuits of the UPS power supply.

[0014] Compared with the prior art, the UPS power supply with high power quality of the present invention has the following beneficial effects: 1. By identifying the types and priorities of newly connected loads of the UPS power supply, analyzing the access power sources and access phases suitable for each newly connected load of the UPS power supply, and then performing access; real-time monitoring the load rate of the UPS power supply to judge whether there is an overload risk and automatically unload; monitoring the harmonic content of each phase of the UPS power supply to judge whether the loads connected to each phase of the UPS power supply need to be adjusted and redistributed; thereby realizing scientific and reasonable load management and phase matching, preventing equipment abnormal downtime caused by overload tripping or harmonic superposition, and thus ensuring high-quality power supply.

[0015] 2. By monitoring the operating parameters of the internal circuit of the UPS power supply, judging whether the internal circuit of the UPS power supply operates abnormally, and giving early warnings, realizing real-time monitoring and intelligent early warning of the operating state of the core internal circuit of the UPS power supply, which is beneficial to dynamically identifying potential faults in the core internal circuit of the UPS power supply and taking intervention measures in advance, thereby improving the reliability of UPS power supply and providing safe and continuous 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 drawings required for describing the embodiments will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

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

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

[0019] Figure 3 It is the schematic diagram of the internal circuit structure of the UPS power supply of the present invention. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0020] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the protection scope of the present invention.

[0021] Please refer to Figure 1As shown in the figure, 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 shedding module, a periodic load distribution module by round-robin, a power supply internal circuit operation monitoring and early warning module, and a database.

[0022] The overload monitoring and automatic load shedding module is respectively connected to the load type identification and preliminary access module and the periodic load distribution module by round-robin. The power supply internal circuit operation monitoring and early warning module is connected to the periodic load distribution module by round-robin. 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 types and priorities of 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 and adapted access phase of the newly connected loads of each UPS power supply, and perform access through an intelligent distribution switch.

[0024] Further, the process of identifying the types and priorities of newly connected loads of each UPS power supply in the load type identification and preliminary access module is as follows: Obtain the current waveforms of the newly connected loads of each UPS power supply in the UPS power supply group, analyze the current waveforms of the newly connected loads of each UPS power supply through the fast Fourier transform technology, calculate the total harmonic distortion rate of the newly connected loads of each UPS power supply, and measure the power factor of the newly connected loads of each UPS power supply, and analyze the non-linear tendency coefficient of the newly connected loads of each UPS power supply.

[0025] Compare the non-linear tendency coefficient of the newly connected load of each UPS power supply with the preset threshold of the non-linear tendency coefficient. If the non-linear tendency coefficient of the newly connected load of a certain UPS power supply is greater than or equal to the preset threshold of the non-linear tendency coefficient, then the newly connected load of this UPS power supply is a non-linear load; otherwise, the newly connected load of this UPS power supply is a linear load, and then identify the types of the newly connected loads of each UPS power supply in the UPS power supply group.

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

[0027] As a preferred solution, the method for analyzing the non-linear tendency coefficient of the newly connected load of each UPS power supply is as follows: Denote the total harmonic distortion rate of the newly connected load of each UPS power supply as , represents the number of the newly connected load of the th UPS power supply, , and measure the power factor of the newly connected load of each UPS power supply, and denote it as .

[0028] Substitute the total harmonic distortion rate and power factor of each newly connected load of the UPS power supply into the analysis formula to obtain the nonlinear tendency coefficient of each newly connected load of the UPS power supply , where represents the correction factor of the preset nonlinear tendency coefficient, represents the boundary value of the total harmonic distortion rate for presetting the distinction between linear and nonlinear loads, represents the natural constant, represents the boundary value of the power factor for presetting the distinction between linear and nonlinear loads.

[0029] It should be noted that in the indicators for evaluating whether the connected load is nonlinear, the total harmonic distortion rate and power factor of the load are two major factors. First, the total harmonic distortion rate and power factor with different dimensions are normalized. After normalization, and are respectively the ratios of the total harmonic distortion rate and power factor to their boundary values. In the formula, directly reflects the contribution of the harmonic distortion rate to nonlinearity. The larger the ratio, the stronger the nonlinear tendency. The exponential term is used to characterize the attenuation effect when the power factor deviates from the linear boundary. 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 through the correction factor to meet the requirements of different scenarios. The preset boundary value of the total harmonic distortion rate for distinguishing linear and nonlinear loads and the boundary value of the power factor for distinguishing linear and nonlinear loads are both set manually at the initial stage of system operation. In this embodiment, takes the value of 5%, takes the value of 0.9.

[0030] By collecting multiple groups of specific numerical data of the total harmonic distortion rate and power factor of each newly connected load of the UPS power supply, and through the calculation formula of the nonlinear tendency coefficient of each newly connected load of the UPS power supply for simulation calculation, a feasible simulation process is assumed to be a newly connected load of a single UPS power supply. The correction factor of the nonlinear tendency coefficient, and the threshold of the nonlinear tendency coefficient is 1.7, and the simulation results can be obtained. For specific reference, see Table 1, in which some representative data (linear load data and nonlinear load data) are listed.

[0031] Table 1. Total Harmonic Distortion Rate Data, Power Factor Data, and Calculation Results of Partial Acquisition

[0032]

[0033] Through the above simulation calculations, 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 tendency coefficient is greater than the threshold of the nonlinear tendency coefficient. That is, it is determined that the newly connected load of the UPS power supply is 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 tendency coefficient is less than the threshold of the nonlinear tendency coefficient. That is, it is determined that the newly connected load of the UPS power supply is a linear load.

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

[0035] As a preferred solution, the limit value of the total harmonic distortion rate for distinguishing linear loads from nonlinear loads means that when the total harmonic distortion rate of the load is greater than or equal to this limit value, the load is determined to be a nonlinear load. Conversely, when the total harmonic distortion rate of the load is less than this limit value, the load is determined to be a linear load. In a specific embodiment, the limit value of the total harmonic distortion rate for distinguishing linear loads from nonlinear loads is 5%. That is, when the total harmonic distortion rate is greater than or equal to 5%, it is a nonlinear load, and when the total harmonic distortion rate is less than 5%, it is a linear load.

[0036] As a preferred solution, the limit value of the power factor for distinguishing linear loads from nonlinear loads means that when the power factor of the load is less than or equal to this limit value, the load is determined to be a nonlinear load. Conversely, when the power factor of the load is greater than this limit value, the load is determined to be a linear load. In a specific embodiment, the limit value of the power factor for distinguishing linear loads from nonlinear loads is 0.9. That is, when the power factor is less than or equal to 0.9, it is a nonlinear load, and when the power factor is greater than 0.9, it is a linear load.

[0037] It should be noted that nonlinear loads usually have a relatively high total harmonic distortion rate and a relatively low power factor.

[0038] As a preferred solution, nonlinear loads include but are not limited to: computers, servers, frequency converters, etc. Nonlinear loads will generate harmonics and affect the power quality of the UPS power supply.

[0039] In another specific embodiment, an internal machine learning model is used to train a classifier based on historical data to identify the load type.

[0040] Extract the load priority comparison table stored in the database, and screen to obtain the priorities of the newly connected loads of each UPS power supply in the UPS power supply group.

[0041] As a preferred solution, the priorities corresponding to the loads in the load priority comparison table are set according to actual application requirements.

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

[0043] Further, the load type identification and preliminary access module analyzes the adapted access power supply for the newly connected loads of each UPS power supply. The specific working process is as follows: A1: Obtain the current load rates of each UPS power supply in the UPS power supply group. If the load rate of a certain UPS power supply does not reach the set UPS power supply load rate threshold after a newly connected load, then this UPS power supply is the adapted access power supply for the newly connected load of this UPS power supply. If the load rate of a certain UPS power supply reaches the set UPS power supply load rate threshold after a newly connected load, then this UPS power supply is not the adapted access power supply for the newly connected load of this UPS power supply, and perform A2.

[0044] As a preferred solution, the load rate of the UPS power supply refers to the ratio of the actual load power borne by the UPS power supply to the rated power of the UPS power supply, usually expressed as a percentage. For example, if the rated power of a certain UPS power supply is 10 kVA and it actually provides 6 kVA of power for the load device, then the load rate of this UPS power supply is 60%.

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

[0046] A2: Obtain the current load rates of each other UPS power supply in the UPS power supply group except this UPS power supply. If the load rate of a certain other UPS power supply in the UPS power supply group does not reach the set UPS power supply load rate threshold after connecting the newly connected load of this UPS power supply, then record this other UPS power supply as the backup UPS power supply of this UPS power supply, and screen the backup UPS power supplies of this UPS power supply.

[0047] Obtain the current load rates of the backup UPS power supplies of this UPS power supply, and sort them in descending order of load rate. Take the backup UPS power supply ranked first as the adapted access power supply for the newly connected load of this UPS power supply.

[0048] Further, in the load type identification and preliminary access module, the adaptation access phases of newly connected loads of each UPS power supply are analyzed. The specific working process is as follows: If the newly connected load of a certain UPS power supply is a linear load, then a phase is selected as the adaptation access phase of the newly connected load of the UPS power supply from the phases of the adaptation access power supply of the newly connected load of the UPS power supply according to a preset principle.

[0049] If the newly connected load of a certain UPS power supply is a non-linear load, obtain the number of non-linear loads currently connected to each phase in the adaptation 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 in the adaptation access power supply does not reach the set threshold of the number of non-linear loads connected to a single phase after adding the newly connected load, then record the phase in the adaptation access power supply as an optional phase. If the number of non-linear loads connected to a certain phase in the adaptation access power supply reaches the set threshold of the number of non-linear loads connected to a single phase after adding the newly connected load, then record the phase in the adaptation access power supply as a non-optional phase, and screen each optional phase in the adaptation access power supply of the newly connected load of the UPS power supply.

[0050] Obtain the number of non-linear loads connected to each optional phase in the adaptation access power supply of the newly connected load of the UPS power supply, and sort them in descending order according to the number of non-linear loads connected. Take the optional phase ranked first in the adaptation access power supply as the adaptation access phase of the newly connected load of the UPS power supply.

[0051] Furthermore, obtain the adaptation access phases of newly connected loads of each UPS power supply.

[0052] In a specific embodiment, the threshold of the number of non-linear loads connected to a single phase in the adaptation access power supply of the 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. Among them, the primary power distribution switch is used to select the UPS power supply to which the load is connected, and the secondary 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 shedding module is used to monitor the load rate of each UPS power supply in the UPS power supply group in real time, judge whether there is an overload risk for each UPS power supply, and perform automatic load shedding.

[0055] Further, the specific working process of the overload monitoring and automatic load shedding 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 certain UPS power supply at a certain moment is greater than the set UPS power supply load rate threshold and the continuous duration is greater than the set duration, then there is an overload risk for this UPS power supply, and execute B2. Otherwise, there is no overload risk for this UPS power supply.

[0056] B2: Obtain the priorities of each load connected to the UPS power supply, and cut off each load connected to the UPS power supply in ascending order of priority until the UPS power supply is not overloaded.

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

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

[0059] Further, the specific working process of the periodic polling load distribution module is as follows: C1: Set the monitoring period of load polling according to a preset principle, detect the harmonic content of each phase of each UPS power supply in the UPS power supply group within the monitoring period. If the harmonic content of a certain phase of a certain UPS power supply in the UPS power supply group within the monitoring period is greater than the set harmonic content threshold, the load connected to this phase of this UPS power supply needs to be adjusted, and C2 is executed. Otherwise, the load connected to this phase of this UPS power supply does not need to be adjusted.

[0060] C2: Obtain each non-linear load connected to this phase of this UPS power supply and the priorities of each non-linear load, record the non-linear load with the lowest priority connected to this phase of this UPS power supply as the removed load, and allocate the removed load of this phase of this UPS power supply to the other phase with the lowest harmonic content in this UPS power supply, so as to reallocate the loads connected to each phase of this 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 within the monitoring period refers to the maximum harmonic content of each phase of each UPS power supply in the UPS power supply group within the monitoring period.

[0062] It should be noted that the present invention identifies the types and priorities of newly connected loads of the UPS power supply, analyzes the access power sources and access phases suitable for the newly connected loads of each UPS power supply, and performs access; monitors the load rate of the UPS power supply in real time, judges whether there is an overload risk and automatically unloads; monitors the harmonic content of each phase of the UPS power supply, judges whether the loads connected to each phase of the UPS power supply need to be adjusted and reallocated; thus realizing scientific and reasonable load management and phase matching, preventing equipment abnormal downtime caused by overload tripping or harmonic superposition, and thus ensuring high-quality power supply.

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

[0064] Further, refer to Figure 2 As shown, the internal circuit operation monitoring and warning module of the power supply includes a rectifier circuit monitoring and warning unit, an inverter circuit monitoring and warning unit, a static switch circuit monitoring and warning unit, and a filter circuit monitoring and warning unit. The specific working process of the rectifier circuit monitoring and warning unit is as follows: Refer to Figure 3 As shown, through the acquisition circuits corresponding to the rectifier circuits built in each UPS power supply in the UPS power supply group, the voltage volatility and temperature of the rectifier circuits in each UPS power supply in the UPS power supply group are monitored in real time, the evaluation indexes of the operation parameters of the internal circuits of the UPS power supply stored in the database are extracted, the thresholds of the voltage volatility and temperature of the rectifier circuits in the UPS power supply are obtained, the voltage volatility and temperature of the rectifier circuits in each UPS power supply in the UPS power supply group are respectively compared with their corresponding thresholds, the overshoot amounts of the voltage volatility and temperature of the rectifier circuits in each UPS power supply in the UPS power supply group are obtained, and they are substituted into the relationship function between the overshoot amount of the voltage volatility of the rectifier circuit, the overshoot amount of the temperature, and the operation abnormal coefficient of the rectifier circuit to obtain the operation abnormal coefficients of the rectifier circuits in each UPS power supply in the UPS power supply group.

[0065] Compare the operation abnormal coefficients of the rectifier circuits in each UPS power supply in the UPS power supply group with the preset limit value of the operation abnormal coefficient of the rectifier circuit. If the operation abnormal coefficient of the rectifier circuit in a certain UPS power supply in the UPS power supply group is greater than its limit value, the rectifier circuit in this UPS power supply operates abnormally and a warning is given.

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

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

[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 overshoot amount of the voltage volatility of the rectifier circuit, the overshoot amount of the temperature, and the operation abnormal coefficient of the rectifier circuit is a positive correlation function, that is, the larger the overshoot amount of the voltage volatility and the larger the overshoot amount of the temperature, the larger the operation abnormal coefficient of the rectifier circuit.

[0070] In a specific embodiment, the calculation formula for the abnormal operation coefficient of the rectifier circuit is , where represents the abnormal operation coefficient of the rectifier circuit, respectively represent the overshoot of the voltage fluctuation rate and the overshoot of the temperature, respectively represent the thresholds of the preset overshoot of the voltage fluctuation rate and the overshoot of the temperature, respectively represent the weights of the preset overshoot of the voltage fluctuation rate and the overshoot of the temperature, , , .

[0071] Furthermore, the specific working process of the inverter circuit monitoring and warning unit is as follows: Through the acquisition circuits corresponding to the inverter circuits built in each UPS power supply in the UPS power supply group, the output voltage fluctuation rate, output frequency deviation, and efficiency decrease of the inverter circuits in each UPS power supply in the UPS power supply group are monitored in real time. The overshoots of the output voltage fluctuation rate, output frequency deviation, and efficiency decrease of the inverter circuits in each UPS power supply in the UPS power supply group are analyzed and substituted into the relationship function between the overshoots of the output voltage fluctuation rate, output frequency deviation, and efficiency decrease of the preset inverter circuit and the abnormal operation coefficient of the inverter circuit to obtain the abnormal operation coefficient of the inverter circuits in each UPS power supply in the UPS power supply group.

[0072] As a preferred solution, the evaluation indexes of the operation parameters of the internal circuit of the UPS power supply stored in the database are extracted to obtain the thresholds of the output voltage fluctuation rate, output frequency deviation, and efficiency decrease of the inverter circuit in the UPS power supply. The output voltage fluctuation rate, output frequency deviation, and efficiency decrease of the inverter circuits in each UPS power supply in the UPS power supply group are respectively compared with their corresponding thresholds to obtain the overshoots of the output voltage fluctuation rate, output frequency deviation, and efficiency decrease of the inverter circuits in each UPS power supply in the UPS power supply group.

[0073] The abnormal operation coefficients of the inverter circuits in each UPS power supply in the UPS power supply group are compared with the preset limit value of the abnormal operation coefficient of the inverter circuit. If the abnormal operation coefficient of the inverter circuit in a certain UPS power supply in the UPS power supply group is greater than its limit value, the inverter circuit in that UPS power supply operates abnormally and a 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 decrease of the inverter circuit refers to the decrease in the inverter efficiency.

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

[0077] As a preferred solution, the relationship function between the overshoot of the output voltage volatility, the output frequency offset, the overshoot of the efficiency decrease amount of the inverter circuit and the abnormal operation coefficient of the inverter circuit is a positive correlation function, that is, the larger the overshoot of the output voltage volatility, the larger the overshoot of the output frequency offset, and the larger the overshoot of the efficiency decrease amount, the larger the abnormal operation coefficient of the inverter circuit.

[0078] In a specific embodiment, the calculation formula for the abnormal operation coefficient of the inverter circuit is , where represents the abnormal operation coefficient of the inverter circuit, respectively represent the overshoot of the output voltage volatility, the output frequency offset, and the overshoot of the efficiency decrease amount, respectively represent the preset thresholds of the overshoot of the output voltage volatility, the overshoot of the output frequency offset, and the overshoot of the efficiency decrease amount.

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

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

[0081] The abnormal operation coefficients of the static switch circuits in each UPS power supply in the UPS power supply group are compared with the preset limit value of the abnormal operation coefficient of the static switch circuit. If the abnormal operation coefficient of the static switch circuit in a certain UPS power supply in the UPS power supply group is greater than its limit value, the static switch circuit in that UPS power supply operates abnormally and a warning is issued.

[0082] As a preferred solution, the increased amount of 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 duration, the increased amount of contact resistance, the overshoot of the switching transient overvoltage ratio of the static switch circuit and the abnormal operation coefficient of the static switch circuit is a positive correlation function, that is, the larger the overshoot of the switching duration of the static switch circuit, the larger the overshoot of the increased amount of contact resistance, and the larger the overshoot of the switching transient overvoltage ratio, the larger the abnormal operation coefficient of the static switch circuit.

[0086] In a specific embodiment, the calculation formula for the abnormal operation coefficient of the static switch circuit is , where represents the abnormal operation coefficient of the static switch circuit, respectively represent the overshoots of the switching duration, the increased amount of contact resistance, and the switching transient overvoltage ratio, respectively represent the preset thresholds of the overshoots of the switching duration, the increased amount of contact resistance, and the switching transient overvoltage ratio.

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

[0088] As a preferred solution, evaluate the indexes of the operating parameters of the internal circuit of the UPS power supply stored in the database, obtain the number of times of increase in the output harmonic content, the increase in common-mode noise, and the threshold of the calorific value of the filter circuit in the UPS power supply, and compare the number of times of increase in the output harmonic content, the increase in common-mode noise, and the calorific value of the filter circuit in each UPS power supply in the UPS power supply group with their corresponding thresholds respectively, to obtain the overshoot of the number of times of increase in the output harmonic content, the increase in common-mode noise, and the calorific value of the filter circuit in each UPS power supply in the UPS power supply group.

[0089] Compare the operating abnormality coefficient of the filter circuit in each UPS power supply in the UPS power supply group with the preset limit value of the operating abnormality coefficient of the filter circuit. If the operating abnormality coefficient of the filter circuit in a certain UPS power supply in the UPS power supply group is greater than its limit value, the filter circuit in this UPS power supply operates abnormally and a warning is given.

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

[0091] As a preferred solution, the relationship function between the overshoot of the number of times of increase in the output harmonic content, the increase in common-mode noise, and the calorific value of the filter circuit and the operating abnormality coefficient of the filter circuit is a positive correlation function, that is, the greater the overshoot of the number of times of increase in the output harmonic content, the greater the overshoot of the increase in common-mode noise, and the greater the overshoot of the calorific value, the greater the operating abnormality coefficient of the filter circuit.

[0092] In a specific embodiment, the calculation formula of the operating abnormality coefficient of the filter circuit is , where represents the operating abnormality coefficient of the filter circuit, respectively represent the overshoot of the number of times of increase in the output harmonic content, the increase in common-mode noise, and the calorific value, respectively represent the threshold of the overshoot of the number of times of increase in the output harmonic content, the threshold of the overshoot of the increase in common-mode noise, and the overshoot of the calorific value.

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

[0094] The database is used to store the load priority comparison table and store the evaluation indexes of the operating parameters of the internal circuit of the UPS power supply.

[0095] The above content is only an example and illustration of the concept of the present invention. Those skilled in the art of this technology can make various modifications or supplements to the described specific embodiments or use similar methods for substitution, as long as they do not deviate from the concept of the invention or exceed the scope defined by the present invention, and shall fall within the protection scope 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 supply and adapted access phase of each newly connected load of the UPS power supply, and access them through the intelligent 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 within 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 internal circuit operating parameters of the UPS power supply.

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 the newly connected load of each UPS power supply by fast Fourier transform technology, calculate the total harmonic distortion rate of the 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 the 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 threshold value of the nonlinear trend coefficient. If the nonlinear trend coefficient of the newly connected load of a UPS power supply is greater than or equal to the preset threshold value of the nonlinear trend coefficient, 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; The load priority comparison table stored in the database is extracted to 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 adapted access power supply of each UPS power supply newly connected load. The specific working process is as follows: A1: Get 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 adapter access power supply for the new load connected to 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 to the UPS power supply, then the UPS power supply is not the adapter access power supply for the new load connected to the UPS power supply, 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 other than the UPS power supply in the UPS power supply group does not reach the set UPS power supply load rate threshold after the new load is connected to the UPS power supply, then the other UPS power supply is recorded as a substitute UPS power supply for the UPS power supply, and the substitute UPS power supplies for the UPS power supply are screened; The current load rates of the backup UPS power supplies of the UPS power supply are obtained, and they are sorted in descending order according to the load rates, and the first backup UPS power supply is used as the adapter access power supply for the new load accessed by 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 a newly connected load of a UPS power supply is a linear load, a phase is selected from each phase 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, and sort them in descending order according to the number of connected non-linear loads, and use the optional phase ranked first in the adaptive access power supply as the adaptive access phase of the new load connected to the UPS power supply; Then, the adaptation access phase of each UPS power supply newly connected load is obtained.

5. A 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 order from low to high priority until the UPS power supply is not 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 monitoring cycle of load patrol according to the preset principle, detect the harmonic content of each phase of each UPS power supply in the UPS power supply group within the monitoring cycle. If the harmonic content of a certain phase of a UPS power supply in the UPS power supply group within the monitoring cycle 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 each non-linear load 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, 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, wherein the specific working process of the rectifier circuit monitoring and early warning unit is: 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 internal circuit operation parameters of the UPS power supply 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 the 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; 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 its limit, the rectifier circuit in the UPS power supply operates 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, and the overshoot is substituted into the 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 its limit, the inverter circuit in the UPS power supply operates 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, 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 they are 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 of the static switch circuit to obtain the operation abnormality coefficient of the static switch circuit in each UPS power supply in the UPS power supply group; The operation abnormality coefficient of the static switch circuit in each UPS power supply in the UPS power supply group is compared 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 its limit, the static switch circuit in the UPS power supply operates 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: Through 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, and the overshoot is substituted into the 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 preset filter circuit and the abnormal operation coefficient of the filter circuit to obtain the abnormal operation 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 its limit, the filter circuit in the UPS power supply operates abnormally and an early warning is issued.

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