Emergency power supply digital analysis method and system based on Internet of Things

Abstract

The invention discloses an emergency power supply digital analysis method and system based on the Internet of Things, and the method comprises the steps: enabling an electrical storage device to be connected with a feeder line of electrical equipment through a relay, recording a storage capacity change function of a storage battery after conduction as a first function when the relay is conducted, and calculating the theoretical power supply current of the equipment based on the power supply parameters of the feeder line, the theoretical power supply current is used for conducting simulation charging on the storage battery, a simulation storage capacity change function is recorded as a second function, phase parameters of three wires are adjusted according to a preset rule in the simulation process till the first function is the same as the second function, simulation current parameters are recorded as emergency power supply parameters, and a power supply vehicle is used for supplying power to the feeder line; and analyzing the stability of the total current based on the current from the equipment power supply and the emergency power supply in the storage battery, and disconnecting the emergency power supply from the equipment when the stability is lower than a set threshold value. The method has the outstanding advantages of being large in application range, high in practicability, stability and reliability, low in cost and the like.

Description

Technical Field

[0001] The present invention relates to the field of emergency power supply detection, and in particular to an emergency power supply digital analysis method and system based on the Internet of Things. Background Art

[0002] Emergency power supply is a facility used to provide power supply when the main power supply fails or the power outage occurs, so as to ensure the normal operation of important equipment or systems. Since most AC equipment commonly uses three-phase four-wire current, the phase of the emergency power supply current must match the phase of the equipment, otherwise the power supply parameters will be disordered, leading to electrical accidents.

[0003] The phase detection function is usually performed by an ammeter connected to the circuit. However, the ammeter is large in size and is not suitable for installation in a narrow space. Moreover, once the equipment loses power, the ammeter will immediately lose its function, making it impossible for the emergency power supply to determine the initial phase sequence and phase of the connected equipment, affecting the timeliness of the emergency power supply access.

[0004] In addition, when the power supply current of the equipment is abnormal, the emergency power supply and the equipment power supply need to be supplied together to stabilize the working voltage of the equipment. If the current and phase of the equipment power supply change too quickly, the feedback path will not be able to make corresponding adjustments to the power supply parameters of the emergency power supply in time, resulting in instability of the power supply current phase and frequency, which is not conducive to the stable operation of the equipment.

[0005] CN116742780A discloses an intelligent emergency power supply, which relates to the field of power supply technology. By setting a detection module, a charging module, a storage battery, an automatic switching switch, a controller, and an inverter; using the detection module, the output voltage of the mains power grid is detected and sent to the controller. The controller analyzes the distribution characteristics satisfied by the output voltage data of the mains power grid based on the output voltage data of the mains power grid, and realizes fault prediction according to its distribution characteristics. The controller then controls the automatic switching switch to realize automatic switching between the emergency power supply and the mains power, and provides emergency power supply when the mains power is interrupted for a short time. The patent system is based on mains power compensation, cannot be applied to independent battery-powered equipment, cannot perform intelligent phase alignment, and needs to be manually replaced when the emergency power supply is insufficient, so the practicality of the patent is not strong.

[0006] CN110071572A discloses a bidirectional charging and discharging integrated emergency power supply device and a control method thereof, including a DC input circuit, a power conversion unit, a boost isolation unit, an AC output filter unit, a control unit, and a signal acquisition unit. The bidirectional charging and discharging integrated emergency power supply device provided by the present invention can realize the charging of the DC battery by the city power under normal bypass working conditions, maintain the energy storage of the DC battery, and in the case of abnormal bypass power supply, the DC battery is used to provide energy, and the emergency battery is inverted to a three-phase AC voltage to supply power to the load. During the working process, the emergency power supply device performs bidirectional energy flow through the power conversion unit to realize charging and discharging integration, avoiding the lack of high-voltage and high-power chargers on the market, which causes the large-capacity emergency power supply powered by high-voltage DC voltage to be limited in application, and optimizes the control method of the emergency power supply, saving costs. The patent adopts a built-in emergency power supply, which requires independent space storage, and cannot perform joint power supply between the city power supply and the battery. In addition, the practicality of its phase alignment method is poor, so the patent has a small scope of use, low practicality, and low stability. Summary of the invention

[0007] In order to solve the shortcomings of the prior art such as small scope of use, low practicality and low stability, the present invention provides an emergency power supply digital analysis method and system based on the Internet of Things.

[0008] The present invention adopts the following technical solution.

[0009] On one hand, the present invention discloses a digital analysis method for emergency power supply based on the Internet of Things, comprising:

[0010] Step S1. Connecting a power storage device to a three-phase feeder circuit of an electrical device; the power storage device is connected to the feeder circuit via a relay, and when the relay is turned on, recording a function of a change in the amount of power stored in the battery after the relay is turned on as a first function;

[0011] Step S2. Calculate the theoretical power supply current of the device based on the power supply parameters of the feeder line, use the theoretical power supply current to simulate charging the battery, record the simulated power storage capacity change function as the second function, and when the first function and the second function are consistent, record the simulated current parameter as the emergency power supply parameter and go to step S4, otherwise go to step S3;

[0012] Step S3. During the simulation process, the phase parameters of the three lines are adjusted according to preset rules until the first function is the same as the second function, and the simulated current parameters are recorded as emergency power supply parameters;

[0013] Step S4. Using a power supply vehicle to supply power to the feeder line; wherein the power supply vehicle adjusts the power supply current based on the power supply parameters;

[0014] Step S5. Analyze the stability of the total current based on the current from the device power supply and the emergency power supply in the battery, and disconnect the emergency power supply from the device when the stability is lower than a set threshold.

[0015] More preferably,

[0016] In step S1, when the opening and closing current of the relay exceeds a preset range, the relay is disconnected, otherwise the relay is turned on; the preset range is [0,I e ], where I e is the rated current.

[0017] More preferably,

[0018] In step S1, the first function F(t) is expressed as follows:

[0019] F(t)=f1(t)+f2(t)+f3(t)+A0;

[0020] Where t represents time, f1(t) represents the magnitude of the power supply current in the first phase feeder circuit of the equipment; f2(t) represents the magnitude of the power supply current in the second phase feeder circuit of the equipment; f3(t) represents the magnitude of the power supply current in the third phase feeder circuit of the equipment; A0 represents the basic power of the battery.

[0021] More preferably,

[0022] In step S2, the feeder line power supply parameters include the magnitude, frequency, phase and voltage of the power supply current of each phase in the feeder line.

[0023] More preferably,

[0024] In step S2, the theoretical power supply current of the device, that is, the theoretical power supply current of each phase in the feeder line, is calculated according to the following formula:

[0025] IN i =A i ·sin(ω i ·t+θ i )-L i ;

[0026] Where i is an integer and i∈[1,3]; IN i represents the theoretical supply current of the ith feeder line, A i represents the rated current of the i-th feeder line; ω i represents the current frequency of the i-th feeder line; θ i represents the current phase of the i-th feeder line; L i Represents the average line loss of the i-th feeding line.

[0027] More preferably,

[0028] The calculation formula for the average line loss of the i-th feeder line is as follows:

[0029]

[0030] Among them, P1 i P2 is the historical average input power of the i-th feeder line; i is the historical average output power of the i-th feeder line; U represents the supply voltage of the feeder line.

[0031] More preferably,

[0032] In step S2, the second function satisfies:

[0033]

[0034] Among them, G(t) is the second function, U represents the power supply voltage of the feeder line; IN1 represents the theoretical power supply current of the first feeder line; IN2 represents the theoretical power supply current of the second feeder line; IN3 represents the theoretical power supply current of the third feeder line.

[0035] More preferably,

[0036] In step S2 or step S3, the simulated current parameters include phases, current magnitudes and current frequencies of the three lines during the simulation process.

[0037] More preferably,

[0038] In step S3, the preset rules include a variational phase method, a constant current variable frequency method and a random statistical method.

[0039] More preferably,

[0040] In step S4, the peak current in the power supply parameter is adjusted in real time based on the following formula:

[0041] IR = (1-T) IE;

[0042] Among them, IR is the adjusted peak current; IE is the peak current during the emergency power supply vehicle adjusting the power supply process; T is the current parameter change rate.

[0043] More preferably,

[0044] In step S5, the stability a of the total current is calculated according to the following formula:

[0045]

[0046] Where j is an integer, and j∈[1,m], m is the total number of sampling times; t1 is the sampling interval. W(j·t1) is the total output current value of the emergency power supply vehicle at the corresponding time after j·t1 time from the start of power supply; G(t1) is the simulated charging result after t1 time from the start of power supply; W[(j-1)·t1] is the total output current value of the emergency power supply vehicle at the corresponding time after (j-1)·t1 time from the start of power supply; G[(j-1)·t1] is the simulated charging result after (j-1)·t1 time from the start of power supply.

[0047] On the other hand, the present invention discloses an emergency power supply digital analysis system based on the Internet of Things based on the emergency power supply digital analysis method, including a power storage Internet of Things module, a phase detection module, an emergency power supply module, a power supply adjustment module and a digital management module.

[0048] The power storage IoT module is used to connect a power storage device to a three-phase feeder circuit of an electrical device; the power storage device is connected to the feeder circuit via a relay, and when the relay is turned on, a function of a change in the power storage amount of the battery after the relay is turned on is recorded as a first function;

[0049] The phase detection module calculates the theoretical power supply current of the device based on the power supply parameters of the feeder line, uses the theoretical power supply current to simulate charging of the battery, and records the simulated power storage capacity change function as a second function. When the first function and the second function are inconsistent, the phase parameters of the three lines are adjusted according to preset rules during the simulation process until the first function is the same as the second function, and the simulated current parameters are output as emergency power supply parameters;

[0050] The emergency power supply module uses the electricity stored in the battery to temporarily power the equipment, and at the same time calls the emergency power supply vehicle, which connects the modular interface to the equipment feeder line and supplies power to the feeder line; until the main circuit resumes power supply, the power of the emergency power supply is reduced according to the actual current of the main circuit, and the emergency power supply process is completed when the power is zero.

[0051] The power supply adjustment module is used to collect the current parameters of the first function and the device in real time, and adjust the peak current supplied by the emergency power supply to the feeder line based on the current parameter change rate of the device; the current parameters of the device include the current phase and magnitude in the feeder line;

[0052] The digital management module analyzes the stability of the total current based on the current from the equipment power supply and the emergency power supply in the battery, and disconnects the emergency power supply from the equipment when the stability is lower than a set threshold.

[0053] On the other hand, the present application discloses an electronic device, including a processor and a storage medium;

[0054] The storage medium is used to store instructions;

[0055] The processor is used to operate according to the instructions to execute the aforementioned emergency power supply digital analysis method based on the Internet of Things.

[0056] The present application also discloses a computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, implements the emergency power supply digital analysis method based on the Internet of Things.

[0057] The beneficial effects of the present invention are as follows:

[0058] 1. The present invention can connect a power storage device in a three-phase feeder line. When the circuit in the feeder line is disconnected, the relay is turned on, and the battery receives abnormal current. According to the change function of the storage amount, the consistency of the current phase is analyzed, and the battery is used to replace the electric energy meter for phase detection, thereby overcoming the problem that the electric energy meter is difficult to install and lacks power supply, improving the speed and stability of phase detection, and reducing the detection cost.

[0059] 2. When the current phases are inconsistent, the present invention can simulate the three-wire phases to obtain the actual phase difference of the three-wires, adjust the three-wire phases in the emergency power supply according to the actual phase of the feeder line, and adjust the rising curve of the power supply current according to the rate of change of the current phase, so as to ensure that the equipment receives the correct power supply, avoid power supply phase errors, and improve the stability and reliability of the equipment.

[0060] 3. The present invention can establish an emergency analysis platform, collect information such as the AC current and voltage of electrical equipment, incoming line switches, and power supply vehicle status, perform resonance analysis on the current from the equipment power supply and the emergency power supply in the power storage module, calculate the stability of the total current, increase the system's tolerance to power failures, and improve the stability of the equipment emergency power supply system.

[0061] 4. The present invention also has outstanding advantages such as wide application range and strong practicality. BRIEF DESCRIPTION OF THE DRAWINGS

[0062] Figure 1 It is a schematic diagram of the steps of a digital analysis method of emergency power supply based on the Internet of Things of the present invention;

[0063] Figure 2 It is a structural schematic diagram of an emergency power supply digital analysis system based on the Internet of Things of the present invention. DETAILED DESCRIPTION

[0064] In order to make the purpose, technical scheme and advantages of the present invention clearer, the technical scheme of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. The embodiments described in this application are only part of the embodiments of the present invention, not all of them. Based on the spirit of the present invention, other embodiments obtained by ordinary technicians in this field without creative work are all within the scope of protection of the present invention.

[0065] This application discloses a digital analysis method for emergency power supply based on the Internet of Things. Figure 1 ,include:

[0066] Step S1. Connecting a power storage device to a three-phase feeder circuit of an electrical device; the power storage device is connected to the feeder circuit via a relay, and when the relay is turned on, recording a function of a change in the amount of power stored in the battery after the relay is turned on as a first function;

[0067] When the opening and closing current of the relay exceeds the preset range, the relay is disconnected, otherwise the relay is turned on; the preset range is [0,I e ], where I e is the rated current.

[0068] The first function F(t) is expressed as follows:

[0069] F(t)=f1(t)+f2(t)+f3(t)+A0;

[0070] Where t represents time, f1(t) represents the magnitude of the power supply current in the first phase feeder circuit of the device at time t; f2(t) represents the magnitude of the power supply current in the second phase feeder circuit of the device at time t; f3(t) represents the magnitude of the power supply current in the third phase feeder circuit of the device at time t; A0 represents the basic power of the battery.

[0071] Step S2. Calculate the theoretical power supply current of the device based on the power supply parameters of the feeder line, use the theoretical power supply current to simulate charging the battery, record the simulated power storage capacity change function as the second function, and when the first function and the second function are consistent, record the simulated current parameter as the emergency power supply parameter and go to step S4, otherwise go to step S3;

[0072] The feeder line power supply parameters include the magnitude, frequency, phase and voltage of each phase power supply current in the feeder line.

[0073] The theoretical supply current of the equipment, that is, the theoretical supply current of each phase in the feeder line, is calculated according to the following formula:

[0074] IN i =A i ·sin(ω i ·t+θ i )-Li ;

[0075] Where i is an integer and i∈[1,3]; IN i represents the theoretical supply current of the ith feeder line, A i represents the rated current of the i-th feeder line; ω i represents the current frequency of the i-th feeder line; θ i represents the current phase of the i-th feeder line; L i Represents the average line loss of the i-th feeding line.

[0076] The calculation formula for the average line loss of the i-th feeder line is as follows:

[0077]

[0078] Among them, P1 i P2 is the historical average input power of the i-th feeder line; i is the historical average output power of the i-th feeder line; U represents the supply voltage of the feeder line.

[0079] The second function satisfies:

[0080]

[0081] Among them, G(t) is the second function, U represents the power supply voltage of the feeder line; IN1 represents the theoretical power supply current of the first feeder line; IN2 represents the theoretical power supply current of the second feeder line; IN3 represents the theoretical power supply current of the third feeder line.

[0082] The simulated current parameters include the phases, current magnitudes and current frequencies of the three lines during the simulation process.

[0083] Step S3. During the simulation process, the phase parameters of the three lines are adjusted according to preset rules until the first function is the same as the second function, and the simulated current parameters are recorded as emergency power supply parameters;

[0084] The preset rules include a variational phase method, a constant current frequency conversion method and a random statistical method.

[0085] Step S4. Using a power supply vehicle to supply power to the feeder line; wherein the power supply vehicle adjusts the power supply current based on the power supply parameters;

[0086] The peak current in the power supply parameter is adjusted in real time based on the following formula:

[0087] IR = (1-T) IE;

[0088] Among them, IR is the adjusted peak current; IE is the peak current during the emergency power supply vehicle adjusting the power supply process; T is the current parameter change rate.

[0089] Step S5. Analyze the stability of the total current based on the current from the device power supply and the emergency power supply in the battery, and disconnect the emergency power supply from the device when the stability is lower than a set threshold.

[0090] The stability of the total current a is calculated as follows:

[0091]

[0092] Where j is an integer, and j∈[1,m], m is the total number of sampling times; t1 is the sampling interval. W(j·t1) is the total output current value of the emergency power supply vehicle at the corresponding time after j·t1 time from the start of power supply; G(t1) is the simulated charging result after t1 time from the start of power supply; W[(j-1)·t1] is the total output current value of the emergency power supply vehicle at the corresponding time after (j-1)·t1 time from the start of power supply; G[(j-1)·t1] is the simulated charging result after (j-1)·t1 time from the start of power supply.

[0093] Example 1

[0094] A digital analysis method for emergency power supply based on the Internet of Things, please refer to Figure 1 , including the following steps:

[0095] Step S1. Connecting a power storage device to the three-phase feeder circuit of the power-consuming device, wherein the power storage device is connected to the device feeder circuit via a relay. When the relay is turned on, the battery stores the current in the circuit and outputs a first function of the amount of power stored changing with time;

[0096] Step S1 includes:

[0097] Step S11. Use a relay to connect the energy storage device and the feeder line of the equipment, obtain the rated working current of the equipment, set the relay current of the relay to the rated current of the equipment operation, and when the current in the feeder line of the equipment does not match the rated current, the relay is turned on to activate the energy storage device; wherein the relay current is the holding current of the relay, that is, above the holding current, the relay is in an open state, and below the holding current, it is in a closed state; not matching the rated current means that the actual current is not equal to the preset parameters in size or phase, that is, it is deemed to be mismatched.

[0098] Step S12. The equipment line current charges the power storage device, and the power storage device outputs a first function F(t) of the power storage amount varying with time. The first function of the power storage amount varying with time is shown in the following formula:

[0099] F(t)=f1(t)+f2(t)+f3(t)+A0;

[0100] Where t represents time, f1(t), f2(t) and f3(t) represent the power supply current in the first, second and third phase feeder lines of the equipment at time t respectively, and A0 is the basic power of the battery.

[0101] Step S2. Obtain the theoretical power supply current of the device according to the power supply parameters of the device and the average line loss, use the theoretical power supply current to simulate charging of the battery, record the power storage capacity change function obtained during the simulation as the second function, compare the first function and the second function, and proceed to step S4 if the comparison is consistent, otherwise proceed to step S3;

[0102] Step S2 includes:

[0103] Step S21. Calculate the theoretical power supply current of each line based on the rated power supply parameters of the equipment and the average line loss, wherein the rated power supply parameters include the magnitude, frequency, phase and voltage of the rated power supply current. The calculation formula for the theoretical power supply current of each line in the three-phase feeder line is as follows:

[0104] IN = A·sin(ω·t+θ)-L;

[0105] Where A is the line rated current, ω is the current frequency, θ is the line current phase, and L is the average line loss, which is shown in the following formula and is obtained from the historical operating status of the equipment:

[0106]

[0107] Among them, P1 and P2 represent the historical average input power and average output power respectively, and U represents the rated supply voltage;

[0108] Step S22: Use the theoretical power supply current of the three-wire to simulate charging the battery, and use the simulation result as the second function, which satisfies:

[0109]

[0110] Where G(t) is the second function, i is the number, and i∈{1, 2, 3}, IN i Represents the theoretical supply current of the i-th feeder line in the three-phase feeder line, A i ,ω i ,θ i and L i Respectively represent the rated current, current frequency, current phase and average line loss of the i-th feeder line;

[0111] Step S23. Compare the first function and the second function. If F(t)=G(t), the functions are judged to be consistent, and the rated power supply parameters of the equipment are used as the emergency power supply parameters, and go to step S4. Otherwise, the functions are judged to be inconsistent, and go to step S3 to calculate the power supply parameters of the emergency power supply.

[0112] Step S3. During the simulation process, the phase parameters of the three lines are adjusted according to preset rules until the first function is the same as the second function, and the phase, current magnitude and current frequency of the three lines when they are the same are recorded as the initial parameters of the emergency power supply;

[0113] Step S3 includes:

[0114] Step S31. Adjust the power supply parameters of the three feeding lines in the simulated charging process according to preset rules so that the second function simulated after adjustment is the same as the first function, wherein the preset rules include: variational phase method, constant current frequency conversion method and random statistical method;

[0115] The variational phase method is to change the phase of the three lines in the feeder circuit so that the current after the change is consistent with the preset current.

[0116] The constant current frequency conversion method refers to changing the three-line frequency to achieve a consistent effect;

[0117] The random statistical method refers to randomly generating random three-phase currents with different frequencies and phases, and performing iterative selection to make the preferred current consistent with the preset current.

[0118] Step S32: When the first function is the same as the second function, the phase, current magnitude and current frequency of the three feeding lines in the simulated charging line are output as emergency power supply parameters.

[0119] Step S4. Call the emergency power supply vehicle, connect the modular interface of the power supply vehicle to the equipment feeder line, adjust the power supply current according to the phase in the emergency power supply parameters, and receive the feedback data of the line current in the equipment in real time, and adjust the power supply parameters of the power supply current according to the change rate of the current parameters in the feedback data; the power supply parameters of the power supply current include peak current, phase and frequency.

[0120] Step S4 includes:

[0121] Step S41. When the relay is turned on, call the emergency power supply vehicle. After the simulation is completed, transmit the emergency power supply parameters of each feeder line to the emergency power supply vehicle, modulate the current of each line in the power generating device of the emergency power supply vehicle, so that after the modulated current is input into the device, the total power supply current of the device is the same as the power supply parameter of the rated current of the device, and start the power supply vehicle to provide emergency power supply to the device;

[0122] Step S42. The battery continuously outputs the time domain extended function of the first function, and calculates the rate of change T of the time domain extended function;

[0123] Those skilled in the art should know that the time domain stretch function is to stretch the function within a certain time range, and those skilled in the art can construct it according to actual conditions; in the present invention, the rate of change of the time domain stretch function is the rate of change of the current parameter.

[0124] The change rate T of the time domain extension function of the first function is as follows:

[0125]

[0126] Among them, t0 represents the duration of emergency power supply; F(t+t0) is the time domain extension function of F(t); F(t) represents the battery power when emergency power supply is not carried out; F(t+t0) represents the battery power after the emergency power supply lasts for t0 time.

[0127] The present invention converts the sampling values ​​into actual functions by means of function fitting. For example, F(t) and G(t) mentioned above are both continuous functions. Therefore, the rate of change of the time domain extension function of the first function can be calculated in integral form.

[0128] Step S43. Feedback the change rate to the emergency power supply vehicle, and the emergency power supply vehicle adjusts the peak current IE during the power supply process. The adjusted peak current is as shown in the following formula:

[0129] IR = (1-T) IE;

[0130] Where IR is the adjusted peak current.

[0131] Step S5. Establish an emergency analysis platform, perform resonance analysis on the current from the equipment power supply and the emergency power supply in the power storage module, obtain the stability of the total current, and disconnect the emergency power supply from the equipment when the stability is lower than the threshold.

[0132] Step S5 includes:

[0133] Step S51. Establish an emergency analysis platform for equipment power supply, which consists of multiple software and is used to collect the input and output AC current and voltage of the power equipment, the state of the incoming line switch, the state of the power supply vehicle and the battery storage state;

[0134] Step S52. Perform resonance analysis on the equipment current and the emergency power supply current, and calculate the stability coefficient of the emergency power supply, as shown in the following formula:

[0135]

[0136] Where a is the stability coefficient of the emergency power supply, W(t) is the function of the total output current of the emergency power supply vehicle changing with time, j is an integer representing the sampling number, and j∈[1,m], m and t1 are the preset total number of sampling times and sampling interval respectively; W(j·t1) is the total output current value of the emergency power supply vehicle at the corresponding moment after j·t1 time from the start of power supply; G(t1) is the simulated charging result after t1 time from the start of power supply; W[(j-1)·t1] is the total output current value of the emergency power supply vehicle at the corresponding moment after (j-1)·t1 time from the start of power supply; G[(j-1)·t1] is the simulated charging result after (j-1)·t1 time from the start of power supply.

[0137] The function W(t) of the total output current of the emergency power supply vehicle changing with time is obtained by the ammeter provided by the power supply vehicle.

[0138] Step S53. When the stability coefficient a is lower than a preset threshold, disconnect the emergency power supply from the equipment to ensure power supply safety.

[0139] Example 2

[0140] A digital analysis method for emergency power supply based on the Internet of Things.

[0141] When the equipment power supply current is abnormal, the relay is turned on and the battery capacity is detected to be 0.2KW·h within 10s. After simulation with the standard power supply current, the theoretical capacity is 0.25KW·h. The three-line phase shift simulation is performed, and the simulated capacity is the same as the actual capacity when the phase difference is 100°, 110° and 130° respectively. After calling the emergency power supply vehicle, the phase of the power supply interface is set to 0°, 100° and 210° respectively, and the equipment is connected for emergency power supply.

[0142] The present application also discloses an emergency power supply digital analysis system of an emergency power supply digital analysis method, including a power storage IoT module, a phase detection module, an emergency power supply module, a power supply adjustment module and a digital management module;

[0143] The power storage IoT module is used to connect a power storage device to a three-phase feeder circuit of an electrical device; the power storage device is connected to the feeder circuit via a relay, and when the relay is turned on, a function of a change in the power storage amount of the battery after the relay is turned on is recorded as a first function;

[0144] The phase detection module calculates the theoretical power supply current of the device based on the power supply parameters of the feeder line, uses the theoretical power supply current to simulate charging of the battery, and records the simulated power storage capacity change function as a second function. When the first function and the second function are inconsistent, the phase parameters of the three lines are adjusted according to preset rules during the simulation process until the first function is the same as the second function, and the simulated current parameters are output as emergency power supply parameters;

[0145] The emergency power supply module uses the electricity stored in the battery to temporarily power the equipment, and at the same time calls the emergency power supply vehicle, which connects the modular interface to the equipment feeder line and supplies power to the feeder line; until the main circuit resumes power supply, the power of the emergency power supply is reduced according to the actual current of the main circuit, and the emergency power supply process is completed when the power is zero.

[0146] Those skilled in the art should know that the main circuit is a circuit that continuously supplies power to the device when the relay is disconnected.

[0147] The power supply adjustment module is used to collect the current parameters of the first function and the device in real time, and adjust the peak current supplied by the emergency power supply to the feeder line based on the current parameter change rate of the device; the current parameters of the device include the current phase and magnitude in the feeder line;

[0148] The digital management module analyzes the stability of the total current based on the current from the equipment power supply and the emergency power supply in the battery, and disconnects the emergency power supply from the equipment when the stability is lower than a set threshold.

[0149] Example 3

[0150] See also Figure 2 , an emergency power supply digital analysis system based on the Internet of Things, including a power storage Internet of Things module, a phase detection module, an emergency power supply module, a power supply adjustment module and a digital management module;

[0151] The power storage IoT module is used to connect a power storage device to the three-phase feeder circuit of the device. The power storage device is connected to the three-phase feeder circuit of the device through a relay. The relay current of the relay is set to the rated current of the device. When the current in the three-phase feeder circuit of the device is disconnected or does not match the rated current, the relay is turned on, the battery receives the abnormal current, and outputs a change function of the storage capacity in the battery, and the change function changes with time;

[0152] The power storage IoT module includes: a battery unit and a relay connection unit;

[0153] The battery unit is used to store the current of the equipment feeder circuit and output the change function of the storage amount for phase analysis;

[0154] The relay connection unit is used to set the opening and closing current of the relay, and connect the battery and the equipment feeder line through the relay, and turn on the relay when the opening and closing current exceeds the range. Among them, the opening and closing current exceeds the range means that when the opening and closing current exceeds the preset range, that is, above the rated current, the relay is in the open state, and below the rated current is in the closed state.

[0155] The phase detection module is used to calculate the size of the theoretical power supply current of the equipment when the phases are consistent, use the theoretical power supply current to simulate charging of the battery, analyze the consistency of the current phase, and when the current phases are inconsistent, simulate the storage capacity change function when the three-line phase parameters change until the simulated function is consistent with the actual function, and output the actual phase of the current feeder line; wherein the phase consistency means that the three-line phases of the feeder line are consistent with each other according to preset rules; analyzing the consistency of the current phase is to analyze the consistency of the phases of the three lines of the feeder line.

[0156] The phase detection module includes: a power analysis unit, a synchronization detection unit and a phase simulation unit;

[0157] The power analysis unit is used to calculate the theoretical power storage capacity of the battery when the phases are consistent, and compare the theoretical power storage capacity with the actual power storage capacity; the theoretical power storage capacity of the battery when the phases are consistent is calculated based on the current frequency, line voltage and historical average line loss.

[0158] The synchronous detection unit is used to simulate the battery charging using the theoretical supply current, analyze the consistency of the current phase, and determine the abnormal state of the line phase;

[0159] The phase simulation unit is used to simulate the actual phase of the three lines in the software, so that the actual phase matches the actual storage amount, and outputs the phase difference of the three-phase current. The phase difference is the phase difference between every two lines.

[0160] The emergency power supply module is used to temporarily power the equipment using the power stored in the battery, and at the same time call the emergency power supply vehicle, which connects the modular interface to the equipment feeder line, determines the access position according to the actual phase of the equipment, turns on the emergency power supply, and determines the current rise curve of the power supply current according to the change rate of the current parameter in the line;

[0161] The emergency power supply module includes: a power supply vehicle unit, a module access unit and a current control unit;

[0162] The power supply vehicle unit is used to temporarily supply power to the equipment by using the current generating elements in the power supply vehicle when the equipment power supply is abnormal;

[0163] The module access unit realizes rapid access to the power supply through a plug and socket interface. At the same time, it adopts a digital intelligent detection device and a built-in intelligent acquisition unit in the interface to realize real-time acquisition of the AC voltage and frequency of the electrical equipment.

[0164] The current control unit is used to adjust the power parameters of the power supplied by the power supply vehicle to the power-consuming equipment, and the power parameters include voltage, current, frequency and phase.

[0165] The power supply adjustment module is used to detect the charging and discharging conditions of the battery in real time, feedback the changes in the current phase and magnitude in the equipment feeder circuit, adjust the power of the emergency power supply according to the current change rate, stabilize the three-phase feed current of the equipment, and reduce the power of the emergency power supply according to the actual current of the main circuit after the main circuit is restored to power supply. The emergency power supply process is completed when the power is zero;

[0166] The principle of reducing the power of the emergency power supply according to the actual current of the main circuit, that is, ensuring the power supply power of the main circuit + the power supply power of the emergency power supply = the rated power of the equipment, under constant voltage AC, the formula is:

[0167] P0-V·I=P w ;

[0168] Among them, P0 is the rated power of the equipment, V is the actual voltage of the main circuit, I is the actual current of the main circuit, and Pw is the actual power of the emergency power supply.

[0169] The power supply adjustment module includes: a timing feedback unit and a parameter switching unit;

[0170] The timing feedback unit is used to collect the changes in the current phase and magnitude in the equipment feeder line, and feed back the current change rate to the power supply vehicle;

[0171] The parameter switching unit is used to adjust the power of the emergency power supply in the power supply vehicle according to the feedback signal, and participate in the termination process of the emergency power supply after the power supply of the equipment is restored.

[0172] The digital management module is used to establish an emergency analysis platform, collect the input and output power data of the electrical equipment, the incoming line switch status, the power supply vehicle status and the battery storage status, so that users can view and manage them independently; and perform resonance analysis on the current from the equipment power supply and the emergency power supply in the power storage module to obtain the stability coefficient of the total current, and disconnect the emergency power supply from the equipment when the stability coefficient is lower than the set threshold. The storage status includes battery power, output power, and three-line phase. The set threshold is determined according to the actual equipment requirements, and the higher the value, the better; its preferred value range is [0.8,1].

[0173] The digital management module includes: a platform software unit and a resonance analysis unit;

[0174] The platform software unit is used to collect the operating status of the machine, intelligently collect the AC current and voltage of the electrical equipment, the incoming switch and the status information of the power supply vehicle, and count and display the collected status information to provide a basis for fault analysis; the machine is the equipment; the operating status of the machine includes the AC current and voltage of the electrical equipment, the incoming switch and the status information of the power supply vehicle; the incoming switch information includes the current opening and closing status of the switch and the historical opening and closing records, and the power supply vehicle status information includes the power of the power supply vehicle, the three-wire phase, and the output power.

[0175] The resonance analysis unit is used to perform resonance analysis on the total power supply current of the equipment, determine the stability of the power supply current, and stop the emergency power supply when the stability is lower than the threshold.

[0176] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0177] Finally, it should be noted that the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or replace some of the technical features therein by equivalents. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

[0178] The present disclosure may be a system, a method and / or a computer program product. The computer program product may include a computer-readable storage medium carrying computer-readable program instructions for causing a processor to implement various aspects of the present disclosure.

[0179] A computer-readable storage medium may be a tangible device that can hold and store instructions used by an instruction execution device. A computer-readable storage medium may be, for example, but not limited to, an electrical storage device, a magnetic storage device, an optical storage device, an electromagnetic storage device, a semiconductor storage device, or any suitable combination of the foregoing. More specific examples of computer-readable storage media (a non-exhaustive list) include: a portable computer disk, a hard disk, a random access memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), a static random access memory (SRAM), a portable compact disk read-only memory (CD-ROM), a digital versatile disk (DVD), a memory stick, a floppy disk, a mechanical encoding device, such as a punch card or a raised structure in a groove on which instructions are stored, and any suitable combination of the foregoing. As used herein, a computer-readable storage medium is not to be interpreted as a transient signal per se, such as a radio wave or other freely propagating electromagnetic wave, an electromagnetic wave propagating through a waveguide or other transmission medium (e.g., a light pulse through a fiber optic cable), or an electrical signal transmitted through a wire.

[0180] The computer-readable program instructions described herein can be downloaded from a computer-readable storage medium to each computing / processing device, or downloaded to an external computer or external storage device via a network, such as the Internet, a local area network, a wide area network, and / or a wireless network. The network can include copper transmission cables, optical fiber transmissions, wireless transmissions, routers, firewalls, switches, gateway computers, and / or edge servers. The network adapter card or network interface in each computing / processing device receives the computer-readable program instructions from the network and forwards the computer-readable program instructions for storage in the computer-readable storage medium in each computing / processing device.

[0181] The computer program instructions for performing the operation of the present disclosure may be assembly instructions, instruction set architecture (ISA) instructions, machine instructions, machine-related instructions, microcode, firmware instructions, state setting data, or source code or object code written in any combination of one or more programming languages, including object-oriented programming languages, such as Smalltalk, C++, etc., and conventional procedural programming languages, such as "C" language or similar programming languages. Computer-readable program instructions may be executed completely on a user's computer, partially on a user's computer, as an independent software package, partially on a user's computer, partially on a remote computer, or completely on a remote computer or server. In the case of a remote computer, the remote computer may be connected to the user's computer via any type of network, including a local area network (LAN) or a wide area network (WAN), or may be connected to an external computer (e.g., using an Internet service provider to connect via the Internet). In some embodiments, an electronic circuit, such as a programmable logic circuit, a field programmable gate array (FPGA), or a programmable logic array (PLA), may be customized by utilizing the state information of the computer-readable program instructions, and the electronic circuit may execute the computer-readable program instructions, thereby realizing various aspects of the present disclosure.

[0182] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the above embodiments, ordinary technicians in the relevant field should understand that the specific implementation methods of the present invention can still be modified or replaced by equivalents, and any modifications or equivalent replacements that do not depart from the spirit and scope of the present invention should be covered within the scope of protection of the claims of the present invention.

Claims

1. A digital analysis method for emergency power supply based on the Internet of Things, characterized in that: The method comprises the following steps: Step S1. Connecting a power storage device to a three-phase feeder circuit of an electrical device; the power storage device is connected to the feeder circuit via a relay, and when the relay is turned on, recording a function of a change in the amount of power stored in the battery after the relay is turned on as a first function; Step S2. Calculate the theoretical power supply current of the device based on the power supply parameters of the feeder line, use the theoretical power supply current to simulate charging the battery, record the simulated power storage capacity change function as the second function, and when the first function and the second function are consistent, record the simulated current parameter as the emergency power supply parameter and go to step S4, otherwise go to step S3; Step S3. During the simulation process, the phase parameters of the three lines are adjusted according to preset rules until the first function is the same as the second function, and the simulated current parameters are recorded as emergency power supply parameters; Step S4. Using a power supply vehicle to supply power to the feeder line; wherein the power supply vehicle adjusts the power supply current based on the power supply parameters; Step S5. Analyze the stability of the total current based on the current from the device power supply and the emergency power supply in the battery, and disconnect the emergency power supply from the device when the stability is lower than a set threshold.

2. The emergency power supply digital analysis method according to claim 1 is characterized in that: In step S1, when the opening and closing current of the relay exceeds a preset range, the relay is disconnected, otherwise the relay is turned on; the preset range is [0,I e ], where I e is the rated current.

3. The emergency power supply digital analysis method according to claim 1 is characterized in that: In step S1, the first function F(t) is expressed as follows: F(t)=f1(t)+f2(t)+f3(t)+A0; Where t represents time, f1(t) represents the magnitude of the power supply current in the first phase feeder circuit of the equipment; f2(t) represents the magnitude of the power supply current in the second phase feeder circuit of the equipment; f3(t) represents the magnitude of the power supply current in the third phase feeder circuit of the equipment; A0 represents the basic power of the battery.

4. The emergency power supply digital analysis method according to claim 1 is characterized in that: In step S2, the feeder line power supply parameters include the magnitude, frequency, phase and voltage of the power supply current of each phase in the feeder line.

5. The emergency power supply digital analysis method according to claim 1 is characterized in that: In step S2, the theoretical power supply current of the device, that is, the theoretical power supply current of each phase in the feeder line, is calculated according to the following formula: IN i =A i ·sin(ω i ·t+θ i )-L i ; Where i is an integer and i∈[1,3]; IN i represents the theoretical supply current of the ith feeder line, A i represents the rated current of the i-th feeder line; ω i represents the current frequency of the i-th feeder line; θ i represents the current phase of the i-th feeder line; L i Represents the average line loss of the i-th feeding line.

6. The emergency power supply digital analysis method according to claim 5 is characterized in that: The calculation formula for the average line loss of the i-th feeder line is as follows: Among them, P1 i P2 is the historical average input power of the i-th feeder line; i is the historical average output power of the i-th feeder line; U represents the supply voltage of the feeder line.

7. The digital analysis method for emergency power supply according to claim 1 or 5, characterized in that: In step S2, the second function satisfies: Among them, G(t) is the second function, U represents the power supply voltage of the feeder line; IN1 represents the theoretical power supply current of the first feeder line; IN2 represents the theoretical power supply current of the second feeder line; IN3 represents the theoretical power supply current of the third feeder line.

8. The emergency power supply digital analysis method according to claim 1 is characterized in that: In step S2 or step S3, the simulated current parameters include phases, current magnitudes and current frequencies of the three lines during the simulation process.

9. The emergency power supply digital analysis method according to claim 1 is characterized in that: In step S3, the preset rules include a variational phase method, a constant current variable frequency method and a random statistical method.

10. The emergency power supply digital analysis method according to claim 1 is characterized in that: In step S4, the peak current in the power supply parameter is adjusted in real time based on the following formula: IR = (1-T) IE; Among them, IR is the adjusted peak current; IE is the peak current during the emergency power supply vehicle adjusting the power supply process; T is the current parameter change rate.

11. The emergency power supply digital analysis method according to claim 1, characterized in that: In step S5, the stability a of the total current is calculated according to the following formula: Where j is an integer and j∈[1,m], m is the total number of sampling times; t1 is the sampling interval; W(j·t1) is the total output current value of the emergency power supply vehicle at the corresponding moment after j·t1 time from the start of power supply; G(t1) is the simulated charging result after t1 time from the start of power supply; W[(j-1)·t1] is the total output current value of the emergency power supply vehicle at the corresponding moment after (j-1)·t1 time from the start of power supply; G[(j-1)·t1] is the simulated charging result after (j-1)·t1 time from the start of power supply.

12. An emergency power supply digital analysis system using the emergency power supply digital analysis method according to any one of claims 1 to 11, characterized in that: The system includes a power storage IoT module, a phase detection module, an emergency power supply module, a power supply adjustment module and a digital management module; The power storage IoT module is used to connect a power storage device to a three-phase feeder circuit of an electrical device; the power storage device is connected to the feeder circuit via a relay, and when the relay is turned on, a function of a change in the power storage amount of the battery after the relay is turned on is recorded as a first function; The phase detection module calculates the theoretical power supply current of the device based on the power supply parameters of the feeder line, uses the theoretical power supply current to simulate charging of the battery, and records the simulated power storage capacity change function as a second function. When the first function and the second function are inconsistent, the phase parameters of the three lines are adjusted according to preset rules during the simulation process until the first function is the same as the second function, and the simulated current parameters are output as emergency power supply parameters; The emergency power supply module uses the power stored in the battery to temporarily power the equipment, and at the same time calls the emergency power supply vehicle, which connects the modular interface to the equipment feeder line and supplies power to the feeder line; After the main circuit is restored to power, the power of the emergency power supply is reduced according to the actual current of the main circuit, and the emergency power supply process is completed when the power is zero; The power supply adjustment module is used to collect the current parameters of the first function and the device in real time, and adjust the peak current supplied by the emergency power supply to the feeder line based on the current parameter change rate of the device; the current parameters of the device include the current phase and magnitude in the feeder line; The digital management module analyzes the stability of the total current based on the current from the equipment power supply and the emergency power supply in the battery, and disconnects the emergency power supply from the equipment when the stability is lower than a set threshold.

13. An electronic device, comprising a processor and a storage medium; characterized in that: The storage medium is used to store instructions; The processor is used to operate according to the instructions to execute the emergency power supply digital analysis method according to claims 1-11.

14. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the program is executed by a processor, the emergency power supply digital analysis method described in claims 1-11 is implemented.

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