CN110417111B - Power quality detection method - Google Patents
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- CN110417111B CN110417111B CN201910602942.XA CN201910602942A CN110417111B CN 110417111 B CN110417111 B CN 110417111B CN 201910602942 A CN201910602942 A CN 201910602942A CN 110417111 B CN110417111 B CN 110417111B
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- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J9/00—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting
- H02J9/04—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source
- H02J9/06—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source with automatic change-over, e.g. UPS systems
- H02J9/062—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source with automatic change-over, e.g. UPS systems for AC powered loads
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Abstract
The invention provides a power quality detection method, which comprises the steps of (1) obtaining power attribute information corresponding to an uninterrupted power supply, and determining power supply state information between the uninterrupted power supply and different loads according to the power attribute information; step (2), determining commercial power supply state information and/or storage battery power supply state information corresponding to the uninterruptible power supply according to the power supply state information; step (3), according to the commercial power supply state information and/or the storage battery power supply state information, determining inversion switching state information of the uninterruptible power supply; and (4) determining the electric energy quality state information corresponding to the uninterruptible power supply according to the inversion switching state information.
Description
Technical Field
The invention relates to the technical field of uninterruptible power supply systems, in particular to a power quality detection method.
Background
The data center is a system carrier which is used by computer hardware and software to process and store relevant data information. The data center has powerful data processing and data storage functions, and is widely applied to a plurality of different big data analysis occasions or individual privacy data processing occasions such as bank customer data information processing, financial industry data information processing or internet enterprise user data information processing. In order to ensure the reliability of power supply of a power system, an uninterruptible power supply (ups) is generally adopted in an existing data center as a corresponding power system, and the ups can ensure that the data center always receives power energy provided by an external alternating current power supply or a storage battery.
At present, the uninterruptible power supply utilizes a high-frequency switching technology, and a rectifier and an inverter in a traditional power frequency transformer are replaced by high-frequency switching elements, so that the uninterruptible power supply has the advantages of small size and high efficiency compared with other types of uninterruptible power supplies. Because the uninterruptible power supply is not internally provided with an isolation transformer, certain high-frequency currents exist in an output zero line of the uninterruptible power supply, and the high-frequency currents mainly come from harmonic signal interference of a mains supply power grid, pulsating current harmonic signal interference of a rectifier and a high-frequency inverter, harmonic signal interference of various loads and the like, and the harmonic signals have high signal intensity and are difficult to completely eliminate. Because the data center can continuously work and operate only by supplying power by the uninterruptible power supply, the power quality of the uninterruptible power supply directly affects whether the data center works and operates normally, but in practical application, the uninterruptible power supply has different types of power quality problems such as harmonic pollution, unbalanced three phases and abnormal output power compensation.
Disclosure of Invention
Aiming at the defects in the prior art, the invention provides a power quality detection method which comprises the steps of (1) obtaining power attribute information corresponding to an uninterrupted power supply, and determining power supply state information between the uninterrupted power supply and different loads according to the power attribute information; step (2), determining commercial power supply state information and/or storage battery power supply state information corresponding to the uninterruptible power supply according to the power supply state information; step (3), according to the commercial power supply state information and/or the storage battery power supply state information, determining inversion switching state information of the uninterruptible power supply; and (4) determining the electric energy quality state information corresponding to the uninterruptible power supply according to the inversion switching state information. Therefore, the power quality detection method of the invention obtains the power supply attribute information of the uninterrupted power supply in real time, calculates and analyzes the corresponding voltage inversion state of the uninterrupted power supply in the state of commercial power supply or storage battery power supply according to the power supply attribute information, and can accurately determine the problems of harmonic pollution, three-phase balance, output power compensation and the like in the current power supply process of the uninterrupted power supply by utilizing the voltage inversion state as the voltage inversion state is the necessary voltage conversion process of the uninterrupted power supply for power supply, thereby providing necessary basis for the adjustment of the power supply power quality of the uninterrupted power supply.
The invention provides a power quality detection method, which is characterized by comprising the following steps:
the method comprises the following steps that (1) power supply attribute information corresponding to an uninterrupted power supply is obtained, and power supply state information between the uninterrupted power supply and different loads is determined according to the power supply attribute information;
step (2), determining commercial power supply state information and/or storage battery power supply state information corresponding to the uninterruptible power supply according to the power supply state information;
step (3), determining inversion switching state information of the uninterruptible power supply according to the commercial power supply state information and/or the storage battery power supply state information;
step (4), determining electric energy quality state information corresponding to the uninterruptible power supply according to the inversion switching state information;
further, in the step (1), power supply attribute information corresponding to the uninterruptible power supply is acquired, and power supply state information between the uninterruptible power supply and different loads is determined to specifically include,
step (101), determining circuit topological structure information of the uninterruptible power supply, and calculating to obtain first power supply attribute information of the uninterruptible power supply;
step (102), determining output voltage state information of the uninterruptible power supply, and calculating to obtain second power supply attribute information of the uninterruptible power supply;
step (103), calculating power supply matching parameters between the uninterruptible power supply and the different loads according to the first power supply attribute information and the second power supply attribute information, and using the power supply matching parameters as the power supply state information;
further, in the step (101), determining the circuit topology information of the uninterruptible power supply, and calculating to obtain the first power source attribute information about the uninterruptible power supply specifically includes,
step (1011), obtaining a voltage conversion connection mode between the uninterruptible power supply and the different loads, and determining the voltage conversion precision of the uninterruptible power supply according to the voltage conversion connection mode, wherein the voltage conversion precision is used as the first power supply attribute information;
step (1012), if the voltage conversion connection mode between the uninterruptible power supply and the different loads is a standby mode or a line interaction mode, acquiring an actual voltage single-stage conversion gradient parameter between the uninterruptible power supply and the different loads, and performing fitting comparison operation on the actual voltage single-stage conversion gradient parameter and a theoretical voltage conversion gradient parameter to obtain the voltage conversion precision;
step (1013), if the voltage conversion connection mode between the uninterruptible power supply and the different loads is a double conversion mode, obtaining an actual voltage double-pole conversion gradient parameter between the uninterruptible power supply and the different loads, and performing fitting comparison operation on the actual voltage single-pole conversion gradient parameter and the theoretical voltage conversion gradient parameter to obtain the voltage conversion precision;
in the step (102), determining the output voltage state information of the uninterruptible power supply, and calculating to obtain the second power source attribute information of the uninterruptible power supply specifically comprises,
step (1021), acquiring a voltage output mode between the uninterruptible power supply and the different loads, and determining the voltage output stability of the uninterruptible power supply according to the voltage output mode, wherein the voltage output stability is used as the second power supply attribute information;
step (1022), if the voltage output mode of the uninterruptible power supply and the different loads within the preset time range is a mains supply voltage output mode or a storage battery voltage output mode, acquiring output voltage trough-peak distribution information of the uninterruptible power supply within the preset time range, and calculating to obtain the voltage output stability according to the output voltage trough-peak distribution information and ideal output voltage trough-peak distribution parameters;
step (1023), if the voltage output mode of the uninterruptible power supply and the different loads in the preset time length range is a commercial power-storage battery alternative voltage output mode, acquiring commercial power output voltage trough-wave peak distribution information, storage battery output voltage trough-wave peak distribution information and commercial power-storage battery alternative power supply switching frequency parameters corresponding to the uninterruptible power supply in the preset time length range, and calculating to obtain the voltage output stability according to the commercial power output voltage trough-wave peak distribution information, the storage battery output voltage trough-wave peak distribution information and the commercial power-storage battery alternative power supply switching frequency parameters;
further, in the step (103), calculating power supply matching parameters between the uninterruptible power supply and the different loads according to the first power source attribute information and the second power source attribute information specifically includes,
step (1031), respectively performing validity judgment processing on the first power source attribute information and the second power source attribute information about preset working power supply duration so as to determine power supply validity corresponding to the first power source attribute information and the second power source attribute information;
a step (1032) of calculating a first power supply correlation coefficient and a second power supply correlation coefficient between the first power supply attribute information and the second power supply attribute information determined to have power supply effectiveness and the different loads, respectively;
step (1033) of performing fitting operation processing on the first power supply correlation coefficient and the second power supply correlation coefficient to calculate the power supply matching parameter;
further, in the step (2), it is determined that the utility power supply state information and/or the storage battery power supply state information corresponding to the uninterruptible power supply specifically include, according to the power supply state information,
step (201), acquiring power source state information and power source switching frequency information corresponding to the uninterruptible power supply in a preset power supply operation period from the power supply state information;
step (202), dividing the preset power supply operation cycle into one or more mains supply phases and a storage battery supply phase according to the power source state information and the power source switching frequency information;
step (203), according to the distribution states of the commercial power supply stage and the storage battery power supply stage in the preset power supply operation cycle, at least one of power supply voltage, power supply current, power supply power and power supply frequency respectively corresponding to the uninterruptible power supply under the condition of commercial power supply and/or under the condition of storage battery power supply is calculated and obtained and used as the commercial power supply state information and/or the storage battery power supply state information;
further, in the step (202), dividing the preset power supply operation cycle into one or more mains supply phases and battery supply phases according to the power source state information and the power source switching frequency information includes,
a step (2021) of calculating, based on the power source state information and the power source switching frequency information, a first effective power supply voltage and a second effective power supply voltage corresponding to the uninterruptible power supply, the first effective power supply voltage and the second effective power supply voltage being supplied from commercial power as a power source and from a battery as a power source, respectively;
step (2022), determining a relationship between the first effective power supply voltage and the second effective power supply voltage and a preset power supply voltage threshold, and if the first effective power supply voltage exceeds the preset power supply voltage threshold, obtaining a first power supply duration corresponding to the first effective power supply voltage; if the second effective power supply voltage exceeds the preset power supply voltage threshold, acquiring a second power supply duration corresponding to the second effective power supply voltage;
step (2023), acquiring distribution rule information corresponding to the first power supply duration and the second power supply duration in the preset power supply operation period, so as to determine the commercial power supply stage and the storage battery power supply stage correspondingly included in the preset power supply operation period;
further, in the step (3), it is determined that the information of the inversion switching state of the uninterruptible power supply specifically includes, according to the information of the utility power supply state and/or the information of the storage battery power supply state,
step (301) of obtaining, from the utility power supply state information and/or the storage battery power supply state information, power source output voltage state information and uninterruptible power supply output voltage state information corresponding to the uninterruptible power supply using utility power as a power source and/or a storage battery as a power source;
step (302), according to the power source output voltage state information and the uninterruptible power supply output voltage state information, simulating to obtain an inversion switching model of the uninterruptible power supply;
step (303), according to the inversion switching model, respectively corresponding inversion switching state information of the uninterruptible power supply with commercial power as a power source and/or a storage battery as the power source is calculated;
further, in the step (302), the simulating to obtain the inverse switching model of the ups according to the power source output voltage state information and the ups output voltage state information specifically includes,
step (3021) of calculating a plurality of inversion conversion parameters and a plurality of output voltage correlation coefficients between a plurality of pieces of power source output power state information and a plurality of pieces of uninterruptible power supply output voltage state information;
step (3022) of using the plurality of inversion conversion parameters and the plurality of output voltage correlation coefficients as input data corresponding to the neural network in the operation state of the uninterruptible power supply, so as to obtain an optimized training process for the neural network in the operation state;
step (3023), according to the result of the running state neural network optimization training process, simulating to obtain an inversion switching model of the uninterruptible power supply;
further, in the step (4), according to the inversion switching state information, determining that the power quality state information corresponding to the uninterruptible power supply specifically includes,
a step (401) of acquiring, from the inverter switching state information, at least one of an inverter output voltage value, an inverter output power value, an inverter output voltage phase change value, and an inverter accompanying harmonic value, which correspond to each of the uninterruptible power supply using the utility power as a power source and/or using the storage battery as a power source;
step (402), at least one of the inversion output voltage value, the inversion output power value, the inversion output voltage phase change value and the inversion accompanying harmonic value is used as corresponding input data of the uninterruptible power supply running state neural network, so as to obtain the optimized training processing of the running state neural network;
step (403), calculating to obtain the power quality state information according to the result of the running state neural network optimization training processing;
alternatively, the first and second electrodes may be,
in the step (4), according to the inversion switching state information, determining that the electric energy quality state information corresponding to the uninterruptible power supply comprises,
step (401B), according to the same time interval, measuring the last P times of power supply voltage of the UPS, and forming a set S of the measured values of the last P times of power supply voltage, namely
Where Si is the supply voltage measurement value measured at the ith measurement, i ═ 1, 2, 3, …, P, and the set S is substituted into the following equation (1) to form the corresponding monitoring function:
in the above formula (1), L (S) is the monitoring function, SiIs the ith value of the set S, i is 1, 2, 3, …, P, pi is the circumference ratio,
the monitoring coefficient to be solved;
step (402B), solving the monitoring coefficient by using the following formula (2)
In the above formula (2), SiThe ith value of the set S is i 1, 2, 3, … and P, and pi is a circumferential rate;
a step (403B) of obtaining the monitoring coefficient obtained by the solution of the step (402B)
Substituting into the following equation (3), a prediction function f (x) is obtained:
in the above formula (3), the prediction function f (X) represents a predicted value of the voltage of the ups after X time intervals, where X is any positive integer, and Π is a circumferential ratio;
step (404B), calculating a time x1 when the corresponding power quality state of the ups is in the worst state by using the following formula (4):
in the above formula (4), x1 is the time when the corresponding power quality state of the ups is in the worst state, and Π is the circumferential rate;
further, in the step (403), the calculating the power quality state information according to the result of the running state neural network optimization training process specifically includes,
and according to the result of the running state neural network optimization training processing, calculating at least one of the harmonic pollution state information, the three-phase balance state information and the output power compensation state information corresponding to the uninterruptible power supply with the commercial power as the power source and/or the storage battery as the power source as the power quality state information.
Compared with the prior art, the power quality detection method comprises the steps of (1) obtaining power attribute information corresponding to the uninterruptible power supply, and determining power supply state information between the uninterruptible power supply and different loads according to the power attribute information; step (2), determining commercial power supply state information and/or storage battery power supply state information corresponding to the uninterruptible power supply according to the power supply state information; step (3), according to the commercial power supply state information and/or the storage battery power supply state information, determining inversion switching state information of the uninterruptible power supply; and (4) determining the electric energy quality state information corresponding to the uninterruptible power supply according to the inversion switching state information. Therefore, the power quality detection method of the invention obtains the power supply attribute information of the uninterrupted power supply in real time, calculates and analyzes the corresponding voltage inversion state of the uninterrupted power supply in the state of commercial power supply or storage battery power supply according to the power supply attribute information, and can accurately determine the problems of harmonic pollution, three-phase balance, output power compensation and the like in the current power supply process of the uninterrupted power supply by utilizing the voltage inversion state as the voltage inversion state is the necessary voltage conversion process of the uninterrupted power supply for power supply, thereby providing necessary basis for the adjustment of the power supply power quality of the uninterrupted power supply.
Additional features and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. The objectives and other advantages of the invention will be realized and attained by the structure particularly pointed out in the written description and claims hereof as well as the appended drawings.
The technical solution of the present invention is further described in detail by the accompanying drawings and embodiments.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a schematic flow chart of a power quality detection method according to the present invention.
Detailed Description
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, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Fig. 1 is a schematic structural diagram of a power quality detection method according to an embodiment of the present invention. The power quality detection method comprises the following steps:
the method comprises the following steps of (1) obtaining power supply attribute information corresponding to the uninterrupted power supply, and determining power supply state information between the uninterrupted power supply and different loads according to the power supply attribute information.
Preferably, in the step (1), the power supply attribute information corresponding to the ups is obtained, and the power supply status information between the ups and different loads is determined according to the power supply attribute information to specifically include,
step (101), determining circuit topological structure information of the UPS, and calculating to obtain first power supply attribute information of the UPS;
step (102), determining output voltage state information of the UPS, and calculating to obtain second power supply attribute information of the UPS;
and (103) calculating power supply matching parameters between the uninterruptible power supply and the different loads according to the first power supply attribute information and the second power supply attribute information, and taking the power supply matching parameters as the power supply state information.
Preferably, in the step (101), determining the circuit topology information of the ups, and the calculating to obtain the first power source attribute information about the ups specifically includes,
step (1011), obtaining a voltage conversion connection mode between the uninterruptible power supply and the different loads, and determining the voltage conversion precision of the uninterruptible power supply according to the voltage conversion connection mode, wherein the voltage conversion precision is used as the first power supply attribute information;
step (1012), if the voltage conversion connection mode between the ups and the different loads is the standby mode or the line interaction mode, obtaining the actual voltage single-stage conversion gradient parameter between the ups and the different loads, and performing fitting comparison operation on the actual voltage single-stage conversion gradient parameter and the theoretical voltage conversion gradient parameter to obtain the voltage conversion precision;
and (1013), if the voltage conversion connection mode between the uninterruptible power supply and the different loads is a double conversion mode, acquiring an actual voltage double-pole conversion gradient parameter between the uninterruptible power supply and the different loads, and performing fitting comparison operation on the actual voltage single-pole conversion gradient parameter and the theoretical voltage conversion gradient parameter to obtain the voltage conversion precision.
Preferably, in the step (102), determining the output voltage status information of the ups, and calculating to obtain the second power attribute information about the ups specifically includes,
step (1021), obtaining a voltage output mode between the ups and the different loads, and determining a voltage output stability of the ups according to the voltage output mode, wherein the voltage output stability is used as the second power attribute information;
step (1022), if the voltage output mode of the ups and the different loads in the preset duration range is the mains voltage output mode or the battery voltage output mode, obtaining the output voltage trough-peak distribution information of the ups in the preset duration range, and then calculating to obtain the voltage output stability according to the output voltage trough-peak distribution information and the ideal output voltage trough-peak distribution parameter;
and (1023), if the voltage output mode of the uninterruptible power supply and the different loads in the preset time length range is a commercial power-storage battery alternative voltage output mode, acquiring the commercial power output voltage trough-wave peak distribution information, the storage battery output voltage trough-wave peak distribution information and the commercial power-storage battery alternative power supply switching frequency parameter corresponding to the uninterruptible power supply in the preset time length range, and calculating to obtain the voltage output stability according to the commercial power output voltage trough-wave peak distribution information, the storage battery output voltage trough-wave peak distribution information and the commercial power-storage battery alternative power supply switching frequency parameter.
Preferably, in the step (103), calculating the power supply matching parameters between the ups and the different loads according to the first power source attribute information and the second power source attribute information specifically includes,
step (1031), respectively performing validity judgment processing on the first power source attribute information and the second power source attribute information about preset working power supply duration so as to determine power supply validity corresponding to the first power source attribute information and the second power source attribute information;
a step (1032) of calculating a first power supply correlation coefficient and a second power supply correlation coefficient between the first power supply attribute information and the second power supply attribute information which are determined to have power supply effectiveness and the different loads respectively;
and (1033) performing fitting operation processing on the first power supply correlation coefficient and the second power supply correlation coefficient, so as to calculate the power supply matching parameter.
And (2) determining the commercial power supply state information and/or the storage battery power supply state information corresponding to the uninterruptible power supply according to the power supply state information.
Preferably, in the step (2), it is determined that the utility power supply status information and/or the storage battery power supply status information corresponding to the uninterruptible power supply specifically include,
step (201), obtaining power source state information and power source switching frequency information corresponding to the uninterruptible power supply in a preset power supply operation period from the power supply state information;
step (202), dividing the preset power supply operation cycle into one or more mains supply phases and a storage battery supply phase according to the power source state information and the power source switching frequency information;
and (203) calculating at least one of power supply voltage, power supply current, power supply power and power supply frequency respectively corresponding to the uninterruptible power supply under the condition of mains power supply and/or under the condition of battery power supply according to the distribution states of the mains power supply stage and the battery power supply stage in the preset power supply operation cycle, and using the at least one of power supply voltage, power supply current, power supply power and power supply frequency as the mains power supply state information and/or the battery power supply state information.
Preferably, in the step (202), the step of dividing the preset power supply operation cycle into one or more mains supply phases and battery supply phases includes in particular, according to the power source state information and the power source switching frequency information,
a step (2021) of calculating, based on the power source state information and the power source switching frequency information, a first effective power supply voltage and a second effective power supply voltage corresponding to the uninterruptible power supply, the first effective power supply voltage and the second effective power supply voltage being respectively supplied by commercial power and a storage battery;
step (2022), determining a relationship between the first effective power supply voltage and the second effective power supply voltage and a preset power supply voltage threshold, and if the first effective power supply voltage exceeds the preset power supply voltage threshold, obtaining a first power supply duration corresponding to the first effective power supply voltage; if the second effective power supply voltage exceeds the preset power supply voltage threshold, acquiring a second power supply duration corresponding to the second effective power supply voltage;
step (2023), acquiring distribution rule information corresponding to the first power supply duration and the second power supply duration in the preset power supply operation period, so as to determine the commercial power supply stage and the storage battery power supply stage correspondingly included in the preset power supply operation period.
And (3) determining inversion switching state information of the uninterruptible power supply according to the commercial power supply state information and/or the storage battery power supply state information.
Preferably, in the step (3), determining the inversion switching state information of the uninterruptible power supply specifically includes, according to the utility power supply state information and/or the storage battery power supply state information,
a step (301) of obtaining, from the utility power supply state information and/or the storage battery power supply state information, power source output voltage state information and uninterruptible power supply output voltage state information corresponding to the uninterruptible power supply using utility power as a power source and/or a storage battery as a power source;
step (302), according to the power source output voltage state information and the uninterruptible power supply output voltage state information, simulating to obtain an inversion switching model of the uninterruptible power supply;
and (303) calculating corresponding inversion switching state information of the uninterruptible power supply with the commercial power as a power source and/or the storage battery as the power source according to the inversion switching model.
Preferably, in the step (302), simulating to obtain the inverse switching model of the ups according to the power source output voltage status information and the ups output voltage status information specifically includes,
step (3021), calculating a plurality of inversion conversion parameters and a plurality of output voltage correlation coefficients between the state information of the plurality of power source output power sources and the state information of the plurality of uninterruptible power supplies output voltages;
step (3022), the inversion conversion parameters and the output voltage correlation coefficients are used as input data corresponding to the neural network in the running state of the uninterruptible power supply, so as to obtain an optimized training process for the neural network in the running state;
and (3023) simulating to obtain an inversion switching model of the uninterruptible power supply according to the result of the running state neural network optimization training processing.
And (4) determining the electric energy quality state information corresponding to the uninterruptible power supply according to the inversion switching state information.
Preferably, in the step (4), determining the power quality status information corresponding to the ups according to the inversion switching status information specifically includes,
a step (401) of acquiring, from the inverter switching state information, at least one of an inverter output voltage value, an inverter output power value, an inverter output voltage phase change value, and an inverter accompanying harmonic value, which correspond to each of the uninterruptible power supply using the utility power as a power source and/or using the storage battery as a power source;
step (402), at least one of the inversion output voltage value, the inversion output power value, the inversion output voltage phase change value and the inversion accompanying harmonic value is used as the corresponding input data of the neural network of the operation state of the uninterruptible power supply, so as to obtain the optimization training processing of the neural network of the operation state;
step (403), calculating to obtain the power quality state information according to the result of the running state neural network optimization training processing;
preferably, in the step (4), according to the inversion switching state information, determining that the power quality state information corresponding to the ups includes,
step 401B, according to the same time interval, measuring the last P times of power supply voltage of the UPS, and forming the measured value of the last P times of power supply voltage into a set S, namely S ═ S { (S)1、S2、S3……SpWhere Si is the supply voltage measurement value measured the ith time, i ═ 1, 2, 3, …, P, and this set S is substituted into the following equation (1) to form the corresponding monitoring function:
in the above formula (1), L (S) is the monitoring function, SiI is 1, 2, 3, …, P, pi is the circumferential ratio,
the monitoring coefficient to be solved;
step (402B), using the following formula (2), solving to obtain the monitoring coefficient
In the above formula (2), SiThe ith value of the set S is i 1, 2, 3, … and P, wherein pi is a circumferential rate;
a step (403B) of obtaining the monitoring coefficient obtained by the solution of the step (402B)
Substituting into the following equation (3), a prediction function f (x) is obtained:
in the above formula (3), the prediction function f (X) represents a predicted value of the voltage of the ups after X time intervals, where X is any positive integer, and Π is a circumferential ratio;
step (404B), calculating a time x1 corresponding to the worst power quality status corresponding to the ups by using the following formula (4):
in the above formula (4), x1 is the time when the corresponding power quality state of the ups is in the worst state, and Π is the circumferential rate;
through the relevant steps of determining the power quality state information corresponding to the uninterruptible power supply according to the inversion switching state information, the voltage value corresponding to the uninterruptible power supply in any period of time in the future can be predicted according to the voltage value in the past period of time, in the prediction process, the real-time updating of the prediction expression can be realized as long as the acquisition of voltage data related to the uninterruptible power supply is carried out according to the same time interval, so that the prediction expression has better timeliness, meanwhile, the prediction process can realize intelligent judgment without additionally setting preset parameters and carrying out manual intervention, the time corresponding to the voltage value of the uninterruptible power supply under the worst condition can be predicted through the relevant steps, and whether the voltage value under the worst condition is larger than a threshold value or not can be judged by calculating the corresponding time, if the voltage value is larger than the threshold value, early warning is initiated, the monitoring on the quality of the power supply in the past and the quality of the power supply in the present are achieved, the early warning in the future is achieved, and the corresponding detection method is more perfect and intelligent.
Preferably, in the step (403), the calculating the power quality status information according to the result of the operation status neural network optimization training process specifically includes,
and calculating at least one of the harmonic pollution state information, the three-phase balance state information and the output power compensation state information of the uninterruptible power supply respectively corresponding to the uninterruptible power supply with the commercial power as a power source and/or a storage battery as a power source according to the result of the operation state neural network optimization training processing.
It can be seen from the above embodiments that the power quality detection method includes the steps of (1) obtaining power attribute information corresponding to an uninterruptible power supply, and determining power supply state information between the uninterruptible power supply and different loads according to the power attribute information; step (2), determining commercial power supply state information and/or storage battery power supply state information corresponding to the uninterruptible power supply according to the power supply state information; step (3), according to the commercial power supply state information and/or the storage battery power supply state information, determining inversion switching state information of the uninterruptible power supply; and (4) determining the electric energy quality state information corresponding to the uninterruptible power supply according to the inversion switching state information. Therefore, the power quality detection method of the invention obtains the power supply attribute information of the uninterrupted power supply in real time, calculates and analyzes the corresponding voltage inversion state of the uninterrupted power supply in the state of commercial power supply or storage battery power supply according to the power supply attribute information, and can accurately determine the problems of harmonic pollution, three-phase balance, output power compensation and the like in the current power supply process of the uninterrupted power supply by utilizing the voltage inversion state as the voltage inversion state is the necessary voltage conversion process of the uninterrupted power supply for power supply, thereby providing necessary basis for the adjustment of the power supply power quality of the uninterrupted power supply.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.
Claims (8)
1. A power quality detection method is characterized by comprising the following steps:
the method comprises the following steps that (1) power supply attribute information corresponding to an uninterrupted power supply is obtained, and power supply state information between the uninterrupted power supply and different loads is determined according to the power supply attribute information;
step (2), determining commercial power supply state information and/or storage battery power supply state information corresponding to the uninterruptible power supply according to the power supply state information;
step (3), determining inversion switching state information of the uninterruptible power supply according to the commercial power supply state information and/or the storage battery power supply state information;
step (4), determining electric energy quality state information corresponding to the uninterruptible power supply according to the inversion switching state information;
in the step (3), it is determined that the information of the inversion switching state of the uninterruptible power supply specifically includes, according to the information of the mains supply state and/or the information of the storage battery supply state,
step (301) of obtaining, from the utility power supply state information and/or the storage battery power supply state information, power source output voltage state information and uninterruptible power supply output voltage state information corresponding to the uninterruptible power supply using utility power as a power source and/or a storage battery as a power source;
step (302), according to the power source output voltage state information and the uninterruptible power supply output voltage state information, simulating to obtain an inversion switching model of the uninterruptible power supply;
step (303), according to the inversion switching model, respectively corresponding inversion switching state information of the uninterruptible power supply with commercial power as a power source and/or a storage battery as the power source is calculated;
in the step (302), the simulating to obtain the inverse switching model of the uninterruptible power supply according to the power source output voltage state information and the uninterruptible power supply output voltage state information specifically includes,
step (3021) of calculating a plurality of inversion conversion parameters and a plurality of output voltage correlation coefficients between a plurality of pieces of power source output power state information and a plurality of pieces of uninterruptible power supply output voltage state information;
step (3022) of using the plurality of inversion conversion parameters and the plurality of output voltage correlation coefficients as input data corresponding to the neural network in the operation state of the uninterruptible power supply, so as to obtain an optimized training process for the neural network in the operation state;
and (3023) simulating to obtain an inversion switching model of the uninterruptible power supply according to the result of the running state neural network optimization training processing.
2. The power quality detection method of claim 1, wherein:
in the step (1), power supply attribute information corresponding to the uninterrupted power supply is obtained, and power supply state information between the uninterrupted power supply and different loads is determined according to the power supply attribute information,
step (101), determining circuit topological structure information of the uninterruptible power supply, and calculating to obtain first power supply attribute information of the uninterruptible power supply;
step (102), determining output voltage state information of the uninterruptible power supply, and calculating to obtain second power supply attribute information of the uninterruptible power supply;
and (103) calculating power supply matching parameters between the uninterruptible power supply and the different loads according to the first power supply attribute information and the second power supply attribute information, and taking the power supply matching parameters as the power supply state information.
3. The power quality detection method of claim 2, wherein:
in the step (101), determining the circuit topology information of the uninterruptible power supply, and calculating to obtain the first power source attribute information of the uninterruptible power supply specifically includes,
step (1011), obtaining a voltage conversion connection mode between the uninterruptible power supply and the different loads, and determining the voltage conversion precision of the uninterruptible power supply according to the voltage conversion connection mode, wherein the voltage conversion precision is used as the first power supply attribute information;
step (1012), if the voltage conversion connection mode between the uninterruptible power supply and the different loads is a standby mode or a line interaction mode, acquiring an actual voltage single-stage conversion gradient parameter between the uninterruptible power supply and the different loads, and performing fitting comparison operation on the actual voltage single-stage conversion gradient parameter and a theoretical voltage conversion gradient parameter to obtain the voltage conversion precision;
step (1013), if the voltage conversion connection mode between the uninterruptible power supply and the different loads is a double conversion mode, obtaining an actual voltage double-pole conversion gradient parameter between the uninterruptible power supply and the different loads, and performing fitting comparison operation on the actual voltage single-pole conversion gradient parameter and the theoretical voltage conversion gradient parameter to obtain the voltage conversion precision;
in the step (102), determining the output voltage state information of the uninterruptible power supply, and calculating to obtain the second power source attribute information of the uninterruptible power supply specifically comprises,
step (1021), acquiring a voltage output mode between the uninterruptible power supply and the different loads, and determining the voltage output stability of the uninterruptible power supply according to the voltage output mode, wherein the voltage output stability is used as the second power supply attribute information;
step (1022), if the voltage output mode of the uninterruptible power supply and the different loads within the preset time range is a mains supply voltage output mode or a storage battery voltage output mode, acquiring output voltage trough-peak distribution information of the uninterruptible power supply within the preset time range, and calculating to obtain the voltage output stability according to the output voltage trough-peak distribution information and ideal output voltage trough-peak distribution parameters;
step (1023), if the uninterruptible power supply and the different loads are in the voltage output mode between each other in the preset time length range is the alternating voltage output mode of the mains supply and the storage battery, acquiring the alternating power supply switching frequency parameters of the mains supply output voltage wave trough-wave crest distribution information, the storage battery output voltage wave trough-wave crest distribution information and the mains supply and the storage battery corresponding to the uninterruptible power supply in the preset time length range, and calculating to obtain the voltage output stability according to the alternating power supply switching frequency parameters of the mains supply output voltage wave trough-wave crest distribution information, the storage battery output voltage wave trough-wave crest distribution information and the mains supply and the storage battery.
4. The power quality detection method of claim 2, wherein:
in the step (103), calculating power supply matching parameters between the uninterruptible power supply and the different loads according to the first power source attribute information and the second power source attribute information specifically includes,
step (1031), respectively performing validity judgment processing on the first power source attribute information and the second power source attribute information about preset working power supply duration so as to determine power supply validity corresponding to the first power source attribute information and the second power source attribute information;
a step (1032) of calculating a first power supply correlation coefficient and a second power supply correlation coefficient between the first power supply attribute information and the second power supply attribute information determined to have power supply effectiveness and the different loads, respectively;
and (1033) performing fitting operation processing on the first power supply correlation coefficient and the second power supply correlation coefficient, so as to obtain the power supply matching parameter through calculation.
5. The power quality detection method of claim 1, wherein:
in the step (2), according to the power supply state information, it is determined that the commercial power supply state information and/or the storage battery power supply state information corresponding to the uninterruptible power supply specifically include,
step (201), acquiring power source state information and power source switching frequency information corresponding to the uninterruptible power supply in a preset power supply operation period from the power supply state information;
step (202), dividing the preset power supply operation cycle into one or more mains supply phases and a storage battery supply phase according to the power source state information and the power source switching frequency information;
and (203) calculating at least one of power supply voltage, power supply current, power supply power and power supply frequency respectively corresponding to the uninterruptible power supply under the condition of mains power supply and/or under the condition of storage battery power supply according to the distribution states of the mains power supply stage and the storage battery power supply stage in the preset power supply operation cycle, and using the at least one of power supply voltage, power supply current, power supply power and power supply frequency as the mains power supply state information and/or the storage battery power supply state information.
6. The power quality detection method of claim 5, wherein:
in the step (202), dividing the preset power supply operation cycle into one or more mains supply phases and battery supply phases according to the power source state information and the power source switching frequency information,
a step (2021) of calculating, based on the power source state information and the power source switching frequency information, a first effective power supply voltage and a second effective power supply voltage corresponding to the uninterruptible power supply, the first effective power supply voltage and the second effective power supply voltage being supplied from commercial power as a power source and from a battery as a power source, respectively;
step (2022), determining a relationship between the first effective power supply voltage and the second effective power supply voltage and a preset power supply voltage threshold, and if the first effective power supply voltage exceeds the preset power supply voltage threshold, obtaining a first power supply duration corresponding to the first effective power supply voltage; if the second effective power supply voltage exceeds the preset power supply voltage threshold, acquiring a second power supply duration corresponding to the second effective power supply voltage;
step (2023), acquiring distribution rule information corresponding to the first power supply duration and the second power supply duration in the preset power supply operation period, so as to determine the commercial power supply stage and the storage battery power supply stage correspondingly included in the preset power supply operation period.
7. The power quality detection method of claim 1, wherein:
in the step (4), according to the inversion switching state information, determining that the power quality state information corresponding to the uninterruptible power supply specifically includes,
a step (401A) of acquiring, from the inverter switching state information, at least one of an inverter output voltage value, an inverter output power value, an inverter output voltage phase change value, and an inverter accompanying harmonic value, which correspond to each of the uninterruptible power supply using the utility power as a power source and/or using the storage battery as a power source;
step (402A), at least one of the inversion output voltage value, the inversion output power value, the inversion output voltage phase change value and the inversion accompanying harmonic value is used as corresponding input data of the uninterruptible power supply running state neural network, so as to obtain the optimized training processing of the running state neural network;
step (403A), calculating to obtain the electric energy quality state information according to the result of the running state neural network optimization training processing;
alternatively, the first and second electrodes may be,
in the step (4), according to the inversion switching state information, determining that the electric energy quality state information corresponding to the uninterruptible power supply comprises,
step (401B) of measuring the last P times of supply voltage of the uninterruptible power supply at the same time interval and forming the measured values of the last P times of supply voltage into a set S, i.e. S ═ S1、S2、S3……SpWhere Si is the supply voltage measurement value of the ith measurement, i ═ 1, 2, 3, …, P, and substituting the set S into the following equation (1) forms the corresponding monitoring function:
in the above formula (1), L (S) is the monitoring function, SiIs the ith value of the set S, i is 1, 2, 3, …, P, pi is the circumference ratio,
the monitoring coefficient to be solved;
step (402B), solving the monitoring coefficient by using the following formula (2)
In the above formula (2), SiThe ith value of the set S is i 1, 2, 3, … and P, and pi is a circumferential rate;
a step (403B) of obtaining the monitoring coefficient obtained by the solution of the step (402B)
Substituting into the following equation (3), a prediction function f (x) is obtained:
in the above formula (3), the prediction function f (X) represents a predicted value of the voltage of the ups after X time intervals, where X is any positive integer, and Π is a circumferential ratio;
step (404B), calculating a time x1 when the corresponding power quality state of the ups is in the worst state by using the following formula (4):
in the above equation (4), x1 is the time when the corresponding power quality state of the ups is in the worst state, and Π is the circumferential rate.
8. The power quality detection method of claim 7, wherein:
in the step (403A), the calculating to obtain the power quality status information specifically includes, according to the result of the running status neural network optimization training process,
and according to the result of the running state neural network optimization training processing, calculating at least one of the harmonic pollution state information, the three-phase balance state information and the output power compensation state information corresponding to the uninterruptible power supply with the commercial power as the power source and/or the storage battery as the power source as the power quality state information.
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