A power management method and system applied to urban intelligent street lamps

Abstract

The application relates to the technical field of intelligent street lamps and discloses a power management method and system applied to urban intelligent street lamps, which comprises the following steps: acquiring characteristic parameters of a target lamp pole; based on the prior height of the lamp pole, combining the transverse displacement of the lamp pole and the twist angle of the lamp pole, sequentially determining the polarization flip angle and the additional attenuation; when a first event and a second event occur simultaneously, triggering a risk warning; in response to the risk warning, calculating a randomization factor based on the maximum value of the polarization flip angle; randomizing a beacon period into a random period, and issuing the randomization factor to all the lamp poles in the designated signal coverage area according to the random period; in response to the risk warning, generating an equivalent control voltage by using the prior cross-polarization isolation, and adjusting the drive duty cycle by using the equivalent control voltage; and in response to the risk warning, determining whether the lamp pole angular velocity of the target lamp pole is synchronized with the second-order pendulum prior frequency, and then performing energy supplementing treatment on the super capacitor of the target lamp pole.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of intelligent street lamps, more specifically, it relates to a power management method and system applied to urban intelligent street lamps. BACKGROUND

[0002] For the high bridge road lighting system in the area with frequent typhoon and strong wind, the wireless Mesh network control mode is adopted. Due to the open space of the high bridge, the wind speed is significantly higher than that of the ground street, and the lamp pole structure is usually high and slender. In order to bear the wireless communication antenna, sensor, power module and the like, the side arm type or top-mounted directional radio frequency device is often equipped. Under extreme weather conditions, especially under the action of typhoon or strong gust, transient interference and misoperation phenomena that are not easy to be detected often occur.

[0003] For example, the first event: under the action of typhoon wind force, the lamp pole will produce a large lateral displacement and rotation of the top structure for a short time. Thus, the main beam of the wireless antenna deviates from the original direction, and the polarization direction of the antenna also changes, resulting in a significant decrease in signal strength.

[0004] In addition, the second event: the structural response of the lamp pole will present periodic vibration with a stable frequency at certain specific wind speed, forming a second-order pendulum, and the period of which is approximately multiple of the sending period of the Beacon signal in the wireless Mesh network in a few cases.

[0005] It is just because the two phenomena often coincide in time sequence that the wireless communication link appears serious quality decline and misjudgment as offline within a few seconds, and then triggers the reconstruction of the Mesh network. At the same time, the lighting control system may also misjudge as lighting system failure, thereby causing unnecessary power failure, road section blackout or energy switching operation. SUMMARY

[0006] The present application provides a power management method and system applied to urban intelligent street lamps, which solves the technical problems proposed in the background art.

[0007] In a first aspect, a power management method applied to urban intelligent street lamps, comprising:

[0008] Step 1: obtaining the characteristic parameters of the target lamp pole; wherein the characteristic parameters include: lamp pole lateral displacement, lamp pole torsion angle, signal strength and beacon period;

[0009] Step 2: based on the prior height of the lamp pole, combining the lamp pole lateral displacement and the lamp pole torsion angle, the polarization flip angle and the additional attenuation are determined in turn;

[0010] Step 3, record the absolute value of the polarization flip angle greater than or equal to the preset flip angle threshold as a first event; record the current time located in the risk window of the beacon period and the additional attenuation greater than or equal to the preset attenuation threshold as a second event; when the first event and the second event occur at the same time, trigger the risk warning;

[0011] Step 4, in response to the risk warning, calculate the randomization factor based on the maximum value of the polarization flip angle; randomize the beacon period into a random period, and distribute the randomization factor to all lamp posts in the designated signal coverage area according to the random period;

[0012] Step 5, in response to the risk warning, generate an equivalent control voltage using prior cross-polarization isolation, and adjust the drive duty cycle with the equivalent control voltage;

[0013] Step 6, in response to the risk warning, determine whether the lamp post angular velocity of the target lamp post is synchronized with the second-order torsional pendulum prior frequency, and then perform energy supplementing processing on the super capacitor of the target lamp post;

[0014] Step 7, if the absolute value of the polarization flip angle is less than the preset flip angle threshold, and the signal strength is within the preset safe range, then terminate the risk warning.

[0015] Further, based on the prior height of the lamp post, the polarization flip angle is determined in combination with the lateral displacement of the lamp post and the torsion angle of the lamp post, including:

[0016] The ratio of the lateral displacement of the lamp post to the prior height of the lamp post is obtained as a horizontal offset ratio;

[0017] The inverse tangent value of the horizontal offset ratio is taken as a main beam offset angle;

[0018] The main beam offset angle is added to the torsion angle of the lamp post to obtain the polarization flip angle;

[0019] The polarization flip angle is subjected to time sliding window peak value detection to obtain the maximum value of the polarization flip angle.

[0020] Further, based on the prior height of the lamp post, the additional attenuation is determined in combination with the lateral displacement of the lamp post and the torsion angle of the lamp post, including:

[0021] According to the preset antenna half-power beamwidth, the main beam offset angle is mapped to a main beam offset loss;

[0022] According to the polarization flip angle, a polarization mismatch loss is calculated;

[0023] The main beam offset loss and the polarization mismatch loss are added to obtain the additional attenuation;

[0024] The additional attenuation is subjected to time sliding window peak value detection to obtain the maximum value of the additional attenuation.

[0025] Further, the absolute value of the polarization flip angle ≥ the preset flip angle threshold is recorded as a first event; the current time is located in the risk window of the beacon period, and the additional attenuation ≥ the preset attenuation threshold is recorded as a second event; when the first event and the second event occur at the same time, a risk warning is triggered, including:

[0026] If the absolute value of the polarization flip angle ≥ the preset flip angle threshold, it is recorded as a first event;

[0027] Calculate the remaining amount of the current time in the beacon period, and when the remaining amount is located in the risk window, it is determined as a timing hit;

[0028] In the timing hit, if the additional attenuation ≥ the preset attenuation threshold, it is recorded as a second event;

[0029] When the first event and the second event exist synchronously, a risk warning is triggered.

[0030] Further, in response to the risk warning, a randomization factor is calculated based on the maximum value of the polarization flip angle, including:

[0031] The ratio of the maximum value of the polarization flip angle to the preset polarization reference angle is taken as the amplitude proportion coefficient;

[0032] The amplitude proportion coefficient is multiplied by the preset amplification constant, and the upper limit of the randomization factor is limited to obtain the randomization factor.

[0033] Further, the beacon period is randomized as a random period, and the randomization factor is issued to all lamp poles in the delineated signal coverage area according to the random period, including:

[0034] According to the randomization factor, the beacon period is randomized as a random period;

[0035] The randomization factor and the random period are issued to all lamp poles in the delineated signal coverage area, and the clock of the lamp poles in the delineated signal coverage area is switched to the random period.

[0036] Further, in response to the risk warning, an equivalent control voltage is generated using a prior cross-polarization isolation, and the driving duty cycle is adjusted by the equivalent control voltage, including:

[0037] Based on the polarization flip angle, the cross-polarization isolation is calculated;

[0038] The cross-polarization isolation is compared with the prior cross-polarization isolation to generate an equivalent control voltage;

[0039] According to the equivalent control voltage, the adjustment duty cycle is obtained by scaling the preset duty cycle proportion;

[0040] The adjustment duty cycle is output to the light drive of the target lamp pole.

[0041] Further, in response to the risk warning, if the lamp post angular velocity of the target lamp post is synchronized with the second-order torsional pendulum prior frequency, a super capacitor of the target lamp post is subjected to a power compensation process, including:

[0042] The lamp post angular velocity is acquired at a fixed time interval, and the angular velocity main frequency is calculated through a sliding window;

[0043] The angular velocity main frequency is subtracted from the second-order torsional pendulum prior frequency, and if the difference is less than or equal to a preset synchronization threshold, it is determined that the synchronization is achieved;

[0044] In the synchronization, the super capacitor of the target lamp post is subjected to a power compensation process.

[0045] Further, if the absolute value of the polarization flip angle is less than a preset flip angle threshold, and the signal strength is within a preset safe range, the risk warning is terminated, including:

[0046] Within a preset recovery maintenance time, the absolute value of the polarization flip angle is continuously determined to be less than the preset flip angle threshold, and if the continuous determination is successful, a first safety marker is generated;

[0047] Within a preset recovery maintenance time, the signal strength is continuously determined to be within a preset safe range, and if the continuous determination is successful, a second safety marker is generated;

[0048] When the first safety marker and the second safety marker exist at the same time, the risk warning is terminated;

[0049] The beacon period and the light driving are reset, and the power compensation of the super capacitor of the target lamp post is stopped.

[0050] In a second aspect, a power management system for urban intelligent street lamps is applied to the power management method for urban intelligent street lamps, including:

[0051] A parameter acquisition module is configured to acquire characteristic parameters of a target lamp post, wherein the characteristic parameters include: lamp post lateral displacement, lamp post torsion angle, signal strength, and beacon period;

[0052] A polarization decay module is configured to determine a polarization flip angle and an additional decay in sequence based on a lamp post prior height, in combination with the lamp post lateral displacement and the lamp post torsion angle;

[0053] An early warning triggering module is configured to record the absolute value of the polarization flip angle being greater than or equal to a preset flip angle threshold as a first event, and record the current time being located in a risk window of the beacon period and the additional decay being greater than or equal to a preset decay threshold as a second event; when the first event and the second event occur at the same time, a risk warning is triggered;

[0054] A periodic randomization module is configured to calculate a randomization factor based on the maximum value of the polarization flip angle in response to the risk warning, and randomize the beacon period into a random period and issue the randomization factor to all the lamp poles in the designated signal coverage area according to the random period.

[0055] An equivalent voltage module is configured to generate an equivalent control voltage using the a priori cross-polarization isolation in response to the risk warning, and adjust the drive duty cycle with the equivalent control voltage.

[0056] A power compensation processing module is configured to perform power compensation processing on the super capacitor of the target lamp pole if the lamp pole angular velocity of the target lamp pole is synchronized with the second-order torsional pendulum a priori frequency in response to the risk warning.

[0057] A warning recovery module is configured to terminate the risk warning if the absolute value of the polarization flip angle is less than a preset flip angle threshold and the signal strength is within a preset safe range.

[0058] The application has the advantages that the polarization flip angle of the lamp pole under strong wind disturbance is linked with the dangerous window in the wireless communication beacon period to realize cross-domain real-time fusion between the structural dynamic response, the radio frequency signal mismatch and the control strategy, which not only can issue a risk warning in advance in the extremely low probability of instantaneous mismatch scene, but also can dynamically generate a beacon disturbance amplitude based on the polarization change amplitude, and then synchronously drive the Mesh clock randomization, the current voltage control power limiting and the energy return power supply mechanism, so as to ensure that the urban intelligent street lamp system communication does not drop, the power supply does not break, and the lighting does not break in the extreme environment, and significantly improve the resilience and reliability of the street lighting system. BRIEF DESCRIPTION OF DRAWINGS

[0059] Figure 1 is a flowchart of a power management method applied to an urban intelligent street lamp. DETAILED DESCRIPTION

[0060] The subject matter described herein will now be discussed with reference to example implementations. It should be understood that the discussion of these implementations is merely meant to provide a better understanding of the subject matter described herein and can include changes, modifications, additions, or omissions without departing from the scope of the disclosure. Various processes or components can be omitted, substituted for one another, or added depending on the implementation. In addition, features described with respect to some examples can be combined in other examples.

[0061] Example One is as follows:

[0062] As shown in Figure 1 A power management method applied to an urban intelligent street lamp includes:

[0063] Step 1, obtaining characteristic parameters of the target lamp pole; wherein, the characteristic parameters include: lamp pole lateral displacement, lamp pole torsion angle, signal strength and beacon period;

[0064] It should be noted that the lamp pole lateral displacement represents that the linear position offset of the top end of the lamp pole relative to the bottom installation reference in the horizontal plane is taken as the reference in the direction perpendicular to the vertical axis of the lamp pole; the lamp pole torsion angle represents the angular displacement of the top end relative to the bottom when the lamp pole is twisted around its vertical axis; the signal strength represents the beacon signal power detected by the wireless receiving end (street lamp communication module); and the beacon period represents the transmission interval length of the Beacon frame in wireless communication;

[0065] Step 2, based on the prior height of the lamp pole, the polarization flip angle and the additional attenuation are sequentially determined in combination with the lamp pole lateral displacement and the lamp pole torsion angle;

[0066] Step 3, the absolute value of the polarization flip angle ≥ the preset flip angle threshold is recorded as the first event; the current time is located in the risk window of the beacon period, and the additional attenuation ≥ the preset attenuation threshold is recorded as the second event; when the first event and the second event occur at the same time, the risk warning is triggered;

[0067] Step 4, in response to the risk warning, the randomization factor is calculated based on the maximum value of the polarization flip angle; the beacon period is randomized as a random period, and the randomization factor is issued to all lamp poles in the delineated signal coverage area according to the random period;

[0068] Step 5, in response to the risk warning, the equivalent control voltage is generated by using the prior cross-polarization isolation, and the drive duty cycle is adjusted by using the equivalent control voltage;

[0069] Step 6, in response to the risk warning, it is determined whether the lamp pole angular velocity of the target lamp pole is synchronized with the second-order torsional pendulum prior frequency, and then the super capacitor of the target lamp pole is handled for energy supplement;

[0070] Step 7, if the absolute value of the polarization flip angle < the preset flip angle threshold, and the signal strength is within the preset safe range, the risk warning is terminated.

[0071] In a preferred embodiment, based on the prior height of the lamp pole, the polarization flip angle is determined in combination with the lamp pole lateral displacement and the lamp pole torsion angle, which includes:

[0072] The ratio of the lamp pole lateral displacement to the prior lamp pole height is obtained as a horizontal offset ratio;

[0073] The inverse tangent value of the horizontal offset ratio is taken as a main beam offset angle;

[0074] The main beam offset angle is added to the lamp pole torsion angle to obtain the polarization flip angle;

[0075] The time sliding window peak value detection is performed on the polarization flip angle to obtain a maximum value of the polarization flip angle.

[0076] It should be noted that the lamp pole inclination (lateral displacement of the lamp pole) and the twist are essentially mechanical deformation, and the polarization flip is an electromagnetic characteristic. Through derivation of the horizontal offset ratio to the main beam offset angle to the polarization flip angle, a quantitative correlation between mechanical deformation and electromagnetic polarization is established.

[0077] For example, the inclination of the lamp pole will cause the main lobe of the antenna to drift, and the twist will directly change the polarization direction. The polarization flip angle obtained by superimposing the inclination of the lamp pole and the twist reflects the degree of degradation of the electromagnetic performance caused by the mechanical deformation.

[0078] It should be noted that the horizontal offset ratio is represented by the ratio of the lateral displacement of the lamp pole to the prior height of the lamp pole, and is used to quantify the relative degree of the horizontal inclination of the lamp pole. The main beam offset angle is the azimuth angle offset of the main beam of wireless communication caused by the horizontal inclination of the lamp pole. The polarization flip angle is the superimposed value of the main beam offset angle and the twist angle of the lamp pole, and reflects the deflection angle of the polarization direction of the antenna caused by the combined action of the inclination and the twist of the lamp pole. The maximum value of the polarization flip angle is the extreme value obtained by performing time sliding window peak value detection on the polarization flip angle, and is used to determine the most serious state of the polarization characteristic degradation caused by the deformation of the lamp pole. The prior height of the lamp pole is a calibration value, indicating the factory height of the lamp pole.

[0079] In an embodiment of the present application, based on the prior height of the lamp pole, the additional attenuation is determined in combination with the lateral displacement and the twist angle of the lamp pole, including:

[0080] According to the preset antenna half-power beam width, the main beam offset angle is mapped to the main beam offset loss;

[0081] According to the polarization flip angle, the polarization mismatch loss is calculated;

[0082] The main beam offset loss and the polarization mismatch loss are added to obtain the additional attenuation;

[0083] The time sliding window peak value detection is performed on the additional attenuation to obtain a maximum value of the additional attenuation.

[0084] It should be noted that according to the preset antenna half-power beam width, the main beam offset angle is mapped to the main beam offset loss, as follows:

[0085]

[0086] wherein, the main beam offset angle is represented by, the preset antenna half-power beam width is represented by, the main beam offset loss is represented by;

[0087] It should be noted that according to the polarization flip angle, the polarization mismatch loss is calculated, as follows:

[0088]

[0089] wherein, represents a polarization flip angle, represents a polarization mismatch loss.

[0090] It should be noted that the mapping of the main beam offset loss and the calculation of the polarization mismatch loss are both based on the cosine square approximation model commonly used in engineering to describe the gain distribution within the main lobe.

[0091] It should be noted that the preset antenna half-power beamwidth is the angle between the two directions in which the radiation power of the lamp pole antenna is reduced to 50% of the peak value during the calibration in the configuration stage, which represents the radiation concentration degree of the main beam of the antenna; the main beam offset loss represents that the main beam is offset due to the inclination of the lamp pole, so that the receiving point deviates from the peak direction of the main lobe of the antenna, and the signal power attenuation is calculated through the relationship between the antenna directional diagram and the offset angle; the polarization mismatch loss represents the signal attenuation caused by the polarization direction of the antenna of the lamp pole and the polarization flip angle; the additional attenuation represents the signal attenuation influence of the lamp pole deformation on the wireless link; the maximum value of the additional attenuation is used to determine the most serious state of the link attenuation.

[0092] In an embodiment of the present application, the absolute value of the polarization flip angle ≥ the preset flip angle threshold is recorded as a first event; the current time is located in the risk window of the beacon period, and the additional attenuation ≥ the preset attenuation threshold is recorded as a second event; when the first event and the second event occur at the same time, a risk warning is triggered, including:

[0093] If the absolute value of the polarization flip angle ≥ the preset flip angle threshold, it is recorded as a first event;

[0094] The remaining amount of the current time in the beacon period is calculated, and when the remaining amount is located in the risk window, it is determined that the timing hits;

[0095] Under the timing hit, if the additional attenuation ≥ the preset attenuation threshold, it is recorded as a second event;

[0096] When the first event and the second event exist at the same time, a risk warning is triggered.

[0097] It should be noted that the preset flip angle threshold is used to determine whether the polarization flip reaches the electromagnetic feature threshold triggering the cross-domain coupling control; the current time in the beacon period represents the result of the current time modulo the beacon period, which quantifies the position of the current time in the beacon period, and supports the timing determination of the period resonance; the risk window represents the time interval in the beacon period, which is used to determine whether the time dimension enters the risk period of the period resonance; the timing hit represents that when the current time residue falls into the risk window, and the beacon period and the second-order torsion prior frequency satisfy the torsion frequency is about 2.5 times the beacon period; the preset attenuation threshold is used to determine whether the link attenuation caused by the superposition of the main beam shift and the polarization mismatch reaches the risk level, and the reliability of the reinforced double-feature triggering is improved.

[0098] It should be noted that the beacon period is the transmission interval of the Beacon frame in wireless communication, and the second-order torsion prior frequency is the natural frequency of the lamp pole torsional vibration around the vertical axis. Both satisfy that the natural frequency is about 2.5 times the beacon period, which is equivalent to that the torsion frequency and the beacon frequency form an integer ratio of 5:2; the lamp pole completes 5 torsional vibrations, and the beacon completes 2 period scheduling, so that the periodic deformation of the torsion (driving polarization flip) and the periodic timing of the beacon (driving main lobe shift) continuously phase superimpose, resulting in that the link attenuation (main beam shift loss and polarization mismatch loss) enters the periodic valley state. At this time, the mechanical torsion and the protocol period form a resonance coupling.

[0099] In an embodiment of the present application, in response to the risk warning, a randomization factor is calculated based on the maximum value of the polarization flip angle, including:

[0100] The ratio of the maximum value of the polarization flip angle to the preset polarization reference angle is taken as an amplitude proportion coefficient;

[0101] The amplitude proportion coefficient is multiplied by a preset amplification constant, and the upper limit of the randomization factor is limited, to obtain the randomization factor.

[0102] It should be noted that the preset polarization reference angle represents a pre-set angle value (preferably , corresponding to the theoretical critical angle of complete polarization mismatch) as a quantitative reference of the polarization flip degree, which is used to calculate the proportion of the polarization flip amplitude; the amplitude proportion coefficient is used to quantify the proportion of the current polarization flip amplitude relative to the reference state; the preset amplification constant represents a pre-set constant (preferably 0.02) for scaling the amplitude proportion coefficient to the protocol controllable range, to realize the mapping adjustment of the polarization feature to the protocol parameter. The randomization factor is used to modulate the beacon period and break the period resonance of the torsion and the beacon.

[0103] In an embodiment of the present application, the beacon period is randomized as a random period, and the randomization factor is issued to all lamp poles in the designated signal coverage area according to the random period, including:

[0104] randomize the beacon period into a random period according to the randomization factor;

[0105] distribute the randomization factor and the random period to all the lamp poles in the designated signal coverage area, and switch the clock of the lamp poles in the designated signal coverage area to the random period.

[0106] Specifically, the set of lamp poles in the communication link range needs to synchronously receive the randomization factor and the random period and switch the clock to ensure that the protocol period randomization actions of the lamp poles in the area are performed in coordination.

[0107] It should be noted that the random period represents that the time-varying period obtained by modulating the beacon period by the randomization factor is used to cause the phase shift of the protocol clock and the lamp pole wobble, breaking the period resonance. The designated signal coverage area represents the lamp poles in the communication link range designated by the control node.

[0108] It should be noted that the randomization of the beacon period into a random period according to the randomization factor includes:

[0109]

[0110] wherein, represents the random period, represents the beacon period, represents the randomization factor, represents the second-order wobble prior frequency, represents the current time.

[0111] It should be noted that by periodically fluctuating the beacon period with the instantaneous phase of the lamp pole wobble, the protocol clock and the mechanical vibration continuously generate phase shift, which breaks the valley alignment of the period resonance from the time domain, which is a commonly used sinusoidal modulation model of the period signal in engineering.

[0112] In an embodiment of the present application, in response to the risk warning, an equivalent control voltage is generated using the prior cross-polarization isolation, and the drive duty cycle is adjusted by the equivalent control voltage, including:

[0113] Based on the polarization flip angle, the cross-polarization isolation is calculated;

[0114] The cross-polarization isolation is compared with the prior cross-polarization isolation to generate an equivalent control voltage;

[0115] According to the equivalent control voltage, the adjustment duty cycle is obtained by scaling the preset duty cycle by a scaling ratio;

[0116] The adjustment duty cycle is output to the light drive of the target lamp pole.

[0117] It should be noted that the cross-polarization isolation is calculated based on the polarization flip angle, as follows:

[0118]

[0119] wherein, represents the cross-polarization isolation.

[0120] It should be noted that the equivalent control voltage is generated by comparing the cross-polarization isolation with the prior cross-polarization isolation, as follows:

[0121]

[0122] wherein, represents the equivalent control voltage, represents the voltage conversion coefficient, represents the prior cross-polarization isolation.

[0123] It should be noted that the adjusted duty cycle is obtained by scaling the preset duty cycle scaling ratio according to the equivalent control voltage, as follows:

[0124]

[0125] wherein, represents the adjusted duty cycle, represents the reference duty cycle (preferably 0.8), represents the preset duty cycle scaling ratio.

[0126] It should be noted that the cross-polarization isolation represents the isolation degree between the orthogonal polarization components of the antenna calculated by the polarization flip angle, quantifying the electromagnetic characteristics of polarization direction mismatch; the equivalent control voltage represents the voltage signal generated by mapping after comparing the real-time cross-polarization isolation with the prior cross-polarization isolation, realizing the direct mapping of electromagnetic characteristics to power control quantity; the preset duty cycle scaling ratio represents the coefficient pre-set for linearly scaling the change of the equivalent control voltage to the adjustment amplitude of the duty cycle; the adjusted duty cycle represents the duty cycle value calculated by the equivalent control voltage and the preset duty cycle scaling ratio, which is directly used to adjust the power output of the driving circuit.

[0127] In an embodiment of the present application, in response to the risk warning, it is determined that the lamp pole angular velocity of the target lamp pole is synchronized with the second-order torsional pendulum prior frequency, and then the super capacitor of the target lamp pole is subjected to energy supplementing treatment, including:

[0128] The time-series lamp pole angular velocity is obtained at a fixed time interval, and the angular velocity main frequency is calculated through a sliding window;

[0129] The angular velocity main frequency is subtracted from the second-order torsional pendulum prior frequency, and when the difference is ≤ a preset synchronization threshold, it is determined to be synchronized;

[0130] In synchronization, the super capacitor of the target lamp pole is subjected to energy supplementing processing.

[0131] It should be noted that the second-order torsional pendulum prior frequency represents the second-order torsional vibration natural frequency of the lamp pole factory calibration, representing the natural period characteristic of the lamp pole torsional pendulum around the vertical axis; the angular velocity main frequency represents the frequency component with the highest energy proportion calculated by the sliding window (preferably short-time Fourier transform) on the time-series collected lamp pole angular velocity data; the angular velocity main frequency difference from the second-order torsional pendulum prior frequency represents the absolute frequency difference between the two, quantifying the deviation of the current torsional pendulum frequency from the natural frequency; the preset synchronization threshold represents the frequency difference threshold value, when the frequency difference reaches the threshold value, it is determined that the lamp pole torsional pendulum is synchronized with the second-order natural frequency, triggering the super capacitor energy supplementing logic.

[0132] In an embodiment of the present application, if the absolute value of the polarization flip angle is < the preset flip angle threshold, and the signal strength is within the preset safe range, the risk warning is terminated, including:

[0133] Within the preset recovery maintenance time, the absolute value of the polarization flip angle is continuously determined to be < the preset flip angle threshold, and if the continuous determination is successful, a first safety mark is generated;

[0134] Within the preset recovery maintenance time, the signal strength is continuously determined to be within the preset safe range, and if the continuous determination is successful, a second safety mark is generated;

[0135] When the first safety mark and the second safety mark exist at the same time, the risk warning is terminated;

[0136] Synchronously reset the beacon period and the light drive, and stop supplementing the super capacitor of the target lamp pole.

[0137] Embodiment two is as follows:

[0138] A power management system applied to urban intelligent street lamps, applied to the power management method of the urban intelligent street lamps, comprising:

[0139] A parameter acquisition module for acquiring characteristic parameters of a target lamp pole; wherein the characteristic parameters include: lamp pole lateral displacement, lamp pole torsion angle, signal strength, and beacon period;

[0140] A polarization decay module for determining polarization flip angle and additional decay in sequence based on lamp pole prior height, in combination with lamp pole lateral displacement and lamp pole torsion angle;

[0141] A warning triggering module for recording the absolute value of the polarization flip angle ≥ the preset flip angle threshold as a first event; recording the current time within the risk window of the beacon period and the additional decay ≥ the preset decay threshold as a second event; when the first event and the second event occur at the same time, triggering the risk warning;

[0142] a cycle randomization module, configured to calculate a randomization factor based on a maximum value of the polarization flip angle in response to the risk warning, randomize the beacon cycle into a random cycle, and issue the randomization factor to all the lamp posts in the designated signal coverage area according to the random cycle;

[0143] an equivalent voltage module, configured to generate an equivalent control voltage using the a priori cross-polarization isolation in response to the risk warning, and adjust the drive duty cycle with the equivalent control voltage;

[0144] a compensation processing module, configured to perform compensation processing on the super capacitor of the target lamp post if the lamp post angular velocity of the target lamp post is synchronized with the second-order torsional pendulum a priori frequency in response to the risk warning;

[0145] a warning recovery module, configured to terminate the risk warning if the absolute value of the polarization flip angle is less than a preset flip angle threshold and the signal strength is within a preset safety range.

[0146] The above describes the embodiments of the present embodiment, but the present embodiment is not limited to the specific embodiments described above, which are only illustrative but not restrictive. Those skilled in the art can make many forms under the inspiration of the present embodiment, which are all within the protection scope of the present embodiment.

Claims

1. A power management method applied to an urban intelligent street lamp, characterized in that, The method comprises the following steps: Step 1, obtaining the characteristic parameters of the target lamp pole, wherein the characteristic parameters include: lamp pole lateral displacement, lamp pole torsion angle, signal strength and beacon period; Step 2, based on the prior height of the lamp pole, combining the lamp pole lateral displacement and the lamp pole torsion angle, the polarization flip angle and the additional attenuation are determined in turn, including: The ratio of the lamp pole lateral displacement to the prior height of the lamp pole is obtained as the horizontal offset ratio; The inverse tangent value of the horizontal offset ratio is taken as the main beam offset angle; The main beam offset angle and the lamp pole torsion angle are added to obtain the polarization flip angle; The time sliding window peak value detection is performed on the polarization flip angle to obtain the maximum value of the polarization flip angle; According to the preset antenna half-power beam width, the main beam offset angle is mapped to the main beam offset loss; According to the polarization flip angle, the polarization mismatch loss is calculated; The main beam offset loss and the polarization mismatch loss are added to obtain the additional attenuation; The time sliding window peak value detection is performed on the additional attenuation to obtain the maximum value of the additional attenuation; Step 3, the absolute value of the polarization flip angle≥the preset flip angle threshold is recorded as the first event; the current time is located in the risk window of the beacon period, and the additional attenuation≥the preset attenuation threshold is recorded as the second event; when the first event and the second event occur at the same time, the risk warning is triggered; Step 4, in response to the risk warning, a randomization factor is calculated based on the maximum value of the polarization flip angle; the beacon period is randomized as a random period, and the randomization factor is sent to all lamp poles in the delineated signal coverage area according to the random period; Step 5, in response to the risk warning, an equivalent control voltage is generated by using the prior cross-polarization isolation, and the equivalent control voltage is used to adjust the driving duty cycle; Step 6, in response to the risk warning, it is determined whether the lamp pole angular velocity of the target lamp pole is synchronized with the second-order torsional pendulum prior frequency, and if so, the super capacitor of the target lamp pole is subjected to energy supplementing treatment; Step 7, if the absolute value of the polarization flip angle is less than the preset flip angle threshold, and the signal strength is within the preset safe range, the risk warning is terminated.

2. The power management method applied to the urban intelligent street lamp according to claim 1, characterized in that, The absolute value of the polarization flip angle≥the preset flip angle threshold is recorded as the first event; the current time is located in the risk window of the beacon period, and the additional attenuation≥the preset attenuation threshold is recorded as the second event; When the first event and the second event occur at the same time, the risk warning is triggered, including: If the absolute value of the polarization flip angle≥the preset flip angle threshold, it is recorded as the first event; The residual amount of the current time in the beacon period is calculated, and when the residual amount is located in the risk window, it is determined as a timing hit; Under the timing hit, if the additional attenuation≥the preset attenuation threshold, it is recorded as the second event; When the first event and the second event exist synchronously, the risk warning is triggered.

3. The power management method applied to the urban intelligent street lamp according to claim 2, characterized in that, In response to the risk warning, a randomization factor is calculated based on the maximum value of the polarization flip angle, including: The ratio of the maximum value of the polarization flip angle to the preset polarization reference angle is taken as an amplitude proportionality coefficient; The amplitude proportionality coefficient is multiplied by a preset amplification constant, and the upper limit of the randomization factor is limited to obtain the randomization factor.

4. The power management method applied to the urban intelligent street lamp according to claim 3, characterized in that, The beacon period is randomized as a random period, and the randomization factor is sent to all lamp poles in the delineated signal coverage area according to the random period, including: According to the randomization factor, the beacon period is randomized as a random period; The randomization factor and the random period are sent to all the lamp poles in the designated signal coverage area, and the clock of the lamp poles in the designated signal coverage area is switched to the random period.

5. The power management method for urban intelligent street lamps according to claim 4, characterized in that, In response to the risk warning, an equivalent control voltage is generated using a prior cross-polarization isolation, and a driving duty cycle is adjusted using the equivalent control voltage, including: Based on the polarization roll-off angle, the cross-polarization isolation is calculated; The cross-polarization isolation is compared with the prior cross-polarization isolation to generate an equivalent control voltage; According to the equivalent control voltage, a scaling ratio of the preset duty cycle is obtained to generate an adjusted duty cycle; The adjusted duty cycle is output to the light drive of the target lamp pole.

6. The power management method applied to the urban intelligent street lamp according to claim 5, characterized in that, In response to the risk warning, it is determined whether the lamp pole angular velocity of the target lamp pole is synchronized with the second-order torsional pendulum prior frequency, and then the super capacitor of the target lamp pole is handled for energy compensation, including: The time-series lamp pole angular velocity is obtained at a fixed time interval, and the angular velocity main frequency is calculated through sliding window calculation; The difference between the angular velocity main frequency and the second-order torsional pendulum prior frequency is calculated, and when the difference is less than or equal to a preset synchronization threshold, it is determined that the synchronization is achieved; Under the synchronization, the super capacitor of the target lamp pole is handled for energy compensation.

7. The power management method applied to the urban intelligent street lamp according to claim 6, characterized in that, If the absolute value of the polarization roll-off angle is less than a preset roll-off angle threshold, and the signal strength is within a preset safe range, the risk warning is terminated, including: Within a preset recovery maintenance time, it is continuously determined that the absolute value of the polarization roll-off angle is less than the preset roll-off angle threshold, and if the continuous determination is successful, a first safety marker is generated; Within the preset recovery maintenance time, it is continuously determined that the signal strength is within the preset safe range, and if the continuous determination is successful, a second safety marker is generated; When the first safety marker and the second safety marker exist at the same time, the risk warning is terminated; The beacon period and the light drive are reset synchronously, and the energy compensation of the super capacitor of the target lamp pole is stopped.

8. The power management system applied to the urban intelligent street lamp, applied to the power management method applied to the urban intelligent street lamp in any one of claims 1-7, characterized in that, Including: A parameter acquisition module is configured to acquire characteristic parameters of a target lamp pole; wherein the characteristic parameters include: lamp pole lateral displacement, lamp pole torsion angle, signal strength, and beacon period; A polarization decay module is configured to determine polarization roll-off angle and additional attenuation in sequence based on lamp pole prior height, lamp pole lateral displacement, and lamp pole torsion angle, including: The ratio of the lamp pole lateral displacement to the prior lamp pole height is obtained to obtain a horizontal offset ratio; The inverse tangent value of the horizontal offset ratio is taken as a main beam offset angle; The main beam offset angle and the lamp pole torsion angle are added to obtain the polarization roll-off angle; Time sliding window peak detection is performed on the polarization roll-off angle to obtain the maximum value of the polarization roll-off angle; According to a preset antenna half-power beamwidth, the main beam offset angle is mapped to a main beam offset loss; According to the polarization roll-off angle, a polarization mismatch loss is calculated; The main beam offset loss and the polarization mismatch loss are added to obtain the additional attenuation; Time sliding window peak detection is performed on the additional attenuation to obtain the maximum value of the additional attenuation; An early warning triggering module is configured to record the absolute value of the polarization roll-off angle being greater than or equal to a preset roll-off angle threshold as a first event, and record the current time being in a risk window of the beacon period and the additional attenuation being greater than or equal to a preset attenuation threshold as a second event; when the first event and the second event occur at the same time, the risk warning is triggered. The period randomization module is configured to, in response to the risk warning, calculate a randomization factor based on a maximum value of the polarization flip angle, randomize the beacon period into a random period, and issue the randomization factor to all the lamp posts in the designated signal coverage area according to the random period. The equivalent voltage module is configured to, in response to the risk warning, generate an equivalent control voltage by using the a priori cross-polarization isolation, and adjust the drive duty cycle by using the equivalent control voltage. The energy supplement processing module is configured to, in response to the risk warning, determine whether the lamp post angular velocity of the target lamp post is synchronized with the second-order torsional pendulum a priori frequency, and perform energy supplement processing on the super capacitor of the target lamp post if the determination result is positive. The warning recovery module is configured to, if the absolute value of the polarization flip angle is less than a preset flip angle threshold value and the signal strength is within a preset safety range, terminate the risk warning.

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