A method and system for managing power supply quality for super high-rise buildings

Abstract

The application provides a method and system for treating power supply quality of super high-rise buildings, comprising detecting change data of elevator power in real time; when detecting that an impact load is started, determining impact power generated by the elevator impact load; suppressing the impact power generated by the elevator impact load, and sampling grid side voltage to obtain real-time grid voltage amplitude; when a drop amount of the real-time grid voltage amplitude exceeds a preset drop threshold, generating a voltage sag detection signal; switching the preset super capacitor internal energy storage converter and off-grid mode until it is detected that a power supply of a superior power supply is restored; and proposing a comprehensive optimization configuration scheme of power quality treatment equipment facing harmonics and three-phase imbalance. The application realizes suppression of bidirectional instantaneous impact power generated by a high-speed elevator, completes voltage sag protection of the high-speed elevator, and comprehensively optimizes harmonics and three-phase imbalance in a vertical grid in the super high-rise building.

Description

Technical Field

[0001] The present invention relates to the technical field of power supply quality management, and in particular to a method and system for managing the power supply quality of super high-rise buildings. Background Art

[0002] Super high-rise buildings possess concentrated, diverse, and extremely high socioeconomic loads. These include high-speed elevators with high power bidirectional impact, power-hungry air conditioning and ventilation systems, and a wide variety of computers, lighting, UPS, and specialized equipment. These buildings demand higher power quality while emitting significant disturbances. This contradiction is particularly pronounced in the context of urban distribution networks, which are physically compact and have similar demand times. Currently, the most significant impacts on power quality are concentrated high-speed elevators and distributed loads that emit power quality issues within super high-rise buildings.

[0003] With office equipment, security devices, and other ancillary services becoming increasingly electronic, the loads in super-high-rise buildings consume large amounts of power and are complex and diverse. In densely populated super-high-rise buildings, office electronic equipment includes numerous voltage-stabilized power supplies and frequency converters, injecting significant harmonics into the local power distribution network. The large number of single-phase loads, such as computers, lighting, and small electronic equipment, creates significant system imbalances.

[0004] Furthermore, among the various loads in super-high-rise buildings, high-speed elevators are a unique type of electrical equipment. They generate high power, short duration, and high frequency, and they pose personal safety risks, placing stringent demands on power supply quality. High-speed elevators generate bidirectional transient surge power depending on their up and down movements. These large bidirectional surges can impact the building's power supply system, reducing power quality and stability and impacting the capacity utilization of power supply equipment.

[0005] Currently, for loads in super-high-rise buildings that have small capacity, dispersed connections, large number, and long-term power quality disturbances, the traditional point-to-point power quality management approach has many limitations in terms of management effect, investment efficiency, and space constraints. It is necessary to design a system-level comprehensive optimization plan based on the characteristics of the power supply network of super-high-rise buildings; and for the high-power impact-type high-speed elevators installed centrally in super-high-rise buildings, the existing management equipment has a single function and cannot meet their multiple needs such as impact power smoothing, power quality problem management, and voltage disturbance response. It is necessary to develop multi-functional optimization devices in a targeted manner. Summary of the Invention

[0006] The purpose of the present invention is to propose a method and system for managing the power supply quality of super high-rise buildings, and to solve the technical problem of how to achieve a comprehensive improvement in the power supply quality of each node in a super high-rise building by coordinating a small number of management devices.

[0007] On the one hand, a method for improving the power supply quality of a super high-rise building is provided, comprising:

[0008] Real-time detection of elevator power change data, wherein the elevator power change data includes at least load voltage and load current;

[0009] When it is detected that the impact load is started, determining the impact power generated by the elevator impact load according to the change data of the elevator power;

[0010] The impact power generated by the impact load of the elevator is suppressed by a preset supercapacitor;

[0011] And sample the grid side voltage to obtain the real-time grid voltage amplitude;

[0012] When the real-time grid voltage amplitude drops beyond the preset drop threshold, it is determined that the upstream power supply has lost power and a voltage sag detection signal is generated;

[0013] The preset supercapacitor internal energy storage converter is switched to an off-grid mode according to the voltage sag detection signal until the upper power supply is detected to be restored and the energy storage converter smoothly transitions to a normal operating mode;

[0014] The power quality data of key nodes in the vertical grid power grid is collected, and an optimization management model for the harmonic and three-phase imbalance problems of the vertical grid power grid is constructed. The gradient descent method is used to determine the optimal installation position and output capacity of the management equipment. The overall comprehensive improvement of the power supply quality of each node in the super high-rise building is achieved through the mutual coordination of a small number of management devices.

[0015] Preferably, determining the impact power generated by the elevator impact load according to the elevator power change data specifically includes:

[0016] Identifying real-time load voltage and load current according to the elevator power change data;

[0017] The real-time load voltage and load current are input into the preset load power model to obtain the active power and reactive power at the corresponding moment, and the sum of the active power and reactive power is output as the load power at that moment;

[0018] The difference between the load power before the impact load and the load power after the impact load is output as the impact power generated by the elevator impact load.

[0019] Preferably, the load power model includes:

[0020]

[0021]

[0022] Among them, P represents active power, Q represents reactive power, and v d It represents the component of the load three-phase voltage under the d axis, i d It represents the component of the three-phase current of the load under the d coordinate axis, v q It represents the component of the load three-phase voltage under the q coordinate axis, i q It represents the component of the load three-phase current under the q coordinate axis.

[0023] Preferably, the suppressing of the impact power generated by the elevator impact load by a preset supercapacitor specifically includes:

[0024] Setting the power command value of the supercapacitor to be equal to the impact power, and dividing the power command value of the supercapacitor by the voltage of the supercapacitor to obtain the current command value of the supercapacitor;

[0025] When the surge power is generated, the supercapacitor is discharged, and the difference between the supercapacitor current command value and the supercapacitor current actual value is compared with the carrier after being controlled by the PI controller to obtain the control signal of the switch tube;

[0026] Preferably, it also includes:

[0027] Obtain power grid distribution data for super high-rise buildings;

[0028] Inputting the power grid distribution data into a preset convex optimization harmonic and three-phase imbalance control model to obtain the optimal control equipment configuration node;

[0029] The power quality disturbance source is managed according to the optimal management device configuration node.

[0030] Preferably, the preset convex optimization harmonic and three-phase imbalance control model includes:

[0031]

[0032]

[0033] in, It represents the harmonic voltage of node k before treatment and the harmonic voltage of order h. represents the harmonic impedance between nodes k and q, represents the harmonic compensation current of the power quality control equipment configured at node q, and Represents phasors and The phase angle, Indicates the negative sequence voltage value of k nodes before governance, represents the negative sequence impedance between nodes k and q, Represents the negative sequence compensation current of the power quality management equipment configured at node q, and Represents phasors and The phase angle of .

[0034] On the other hand, a system for managing the power supply quality of a super high-rise building is provided to implement the method for managing the power supply quality of a super high-rise building, comprising:

[0035] A data detection module, configured to detect elevator power change data in real time, wherein the elevator power change data includes at least load voltage and load current;

[0036] An impact power detection module is used to detect when an impact load is started and determine the impact power generated by the elevator impact load based on the change data of the elevator power; suppress the impact power generated by the elevator impact load through a preset supercapacitor, and sample the grid-side voltage to obtain a real-time grid voltage amplitude;

[0037] The voltage sag detection module is used to determine that the upstream power supply has lost power when the real-time grid voltage amplitude drops by more than a preset drop threshold, and generate a voltage sag detection signal;

[0038] The recovery module is used to switch the preset supercapacitor internal energy storage converter to an off-grid mode according to the voltage sag detection signal until the upper power supply is detected to be restored and the energy storage converter smoothly transitions to a normal operation mode.

[0039] Preferably, the impact power detection module is further used to identify the real-time load voltage and load current according to the elevator power change data;

[0040] The real-time load voltage and load current are input into the preset load power model to obtain the active power and reactive power at the corresponding moment, and the sum of the active power and reactive power is output as the load power at that moment;

[0041] The difference between the load power before the impact load and the load power after the impact load is output as the impact power generated by the elevator impact load;

[0042] Wherein, the load power model includes:

[0043]

[0044]

[0045] Among them, P represents active power, Q represents reactive power, and v d It represents the component of the load three-phase voltage under the d axis, i d It represents the component of the three-phase current of the load under the d coordinate axis, v q It represents the component of the load three-phase voltage under the q coordinate axis, i q It represents the component of the load three-phase current under the q coordinate axis.

[0046] Preferably, the impact power detection module is further used to make the power command value of the supercapacitor equal to the impact power, and divide the power command value of the supercapacitor by the voltage of the supercapacitor to obtain the current command value of the supercapacitor;

[0047] When the surge power is generated, the supercapacitor is discharged, and the difference between the supercapacitor current command value and the supercapacitor current actual value is compared with the carrier after being controlled by the PI controller to obtain the control signal of the switch tube;

[0048] Preferably, the recovery module is further used to perform analytical optimization on a convex optimization harmonic and three-phase unbalance control model for a vertical grid power grid to obtain the optimal control equipment configuration nodes and output capacity;

[0049] Controlling the power quality disturbance source according to the optimal control device configuration node;

[0050] The harmonic and three-phase unbalance optimization installation coefficients include:

[0051]

[0052]

[0053] in, It represents the harmonic voltage of node k before treatment and the harmonic voltage of order h. represents the harmonic impedance between nodes k and q, represents the harmonic compensation current of the power quality control equipment configured at node q, and Represents phasors and The phase angle, Indicates the negative sequence voltage value of k nodes before governance, represents the negative sequence impedance between nodes k and q, Represents the negative sequence compensation current of the power quality management equipment configured at node q, and Represents phasors and m is the number of all nodes in the grid, Si is the node installation coefficient, and the smaller the coefficient, the higher the installation priority.

[0054] In summary, the implementation of the embodiments of the present invention has the following beneficial effects:

[0055] The power quality management method and system provided by this invention for super-high-rise buildings mitigates the bidirectional transient power surges generated by high-speed elevators and provides voltage sag protection for these buildings through the design of management equipment topology and control schemes. Secondly, a comprehensive optimization configuration scheme for power quality management equipment is proposed for distributed disturbance loads within vertical grid power grids, addressing harmonics and three-phase imbalance. This approach achieves a comprehensive improvement in the overall power quality of each node in a super-high-rise building through the coordinated use of a small number of management devices. BRIEF DESCRIPTION OF THE DRAWINGS

[0056] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, without paying any creative work, other drawings obtained based on these drawings still fall within the scope of the present invention.

[0057] Figure 1 This is a diagram of a vertical grid power grid structure for a super high-rise building in an embodiment of the present invention.

[0058] Figure 2 The figure is a schematic diagram of the main process of a method for managing the power supply quality of a super high-rise building according to an embodiment of the present invention.

[0059] Figure 3 Schematic diagram of a solution for improving power supply quality in super high-rise buildings according to an embodiment of the present invention.

[0060] Figure 4 This is a topological diagram of a supercapacitor three-level bidirectional DC / DC converter in an embodiment of the present invention.

[0061] Figure 5 Schematic diagram of a control method of a supercapacitor three-level bidirectional DC / DC converter during grid-connected operation according to an embodiment of the present invention.

[0062] Figure 6 Schematic diagram of voltage sag detection in an embodiment of the present invention.

[0063] Figure 7 Schematic diagram of a system for managing power supply quality in super high-rise buildings according to an embodiment of the present invention. DETAILED DESCRIPTION

[0064] In order to make the objectives, technical solutions and advantages of the present invention more clear, the present invention will be described in further detail below with reference to the accompanying drawings.

[0065] like Figure 1 As shown in the figure, the vertical grid power grid topology diagram of a super high-rise building provided by this application adopts cable line feeder wiring. The entire vertical grid power grid adopts the form of zoned power supply, with each group of 30 floors sharing the same distribution room. A public distribution network box is set up every 6 floors in the zone to distribute power according to the characteristics of different loads. The grid adopts 380V power supply with a total capacity of less than 1MVA. The building is greater than 30 stories high and contains a large number of lighting, power, air conditioning frequency conversion and other loads. The users in the middle and high floors have problems with harmonic voltage, imbalance and other power quality that exceed the standard. In addition, due to the high operating power of ultra-high-speed elevators and the rapid changes in operating conditions, high-speed elevators are usually powered by separate lines in buildings.

[0066] like Figure 2 and Figure 3 FIG. 1 is a schematic diagram of an embodiment of a method for improving the power supply quality of a super high-rise building provided by the present invention. In this embodiment, the method includes the following steps:

[0067] Real-time detection of elevator power change data, wherein the elevator power change data includes at least load voltage and load current; that is, rapid detection of ultra-high-speed elevator power changes is mainly achieved by detecting voltage and current.

[0068] Furthermore, when an impact load is detected to be started, the impact power generated by the elevator impact load is determined based on the change data of the elevator power; that is, the monitoring of the impact power of a high-speed elevator can be carried out by performing a dq transformation on the three-phase voltage and current of the load to obtain the components under the qd coordinate axis, and further calculating the active power and reactive power in the load. When the impact load is started, the load power changes suddenly. Based on the load power calculated in real time, the impact power P generated by the impact load can be calculated. pulse .

[0069] In this embodiment, the real-time load voltage and load current are identified based on the elevator power change data; the real-time load voltage and load current are input into a preset load power model to obtain the active power and reactive power at the corresponding moment, and the sum of the active power and reactive power is output as the load power at that moment; the difference between the load power before the impact load and the load power after the impact load is output as the impact power generated by the elevator impact load. The load power model includes:

[0070]

[0071]

[0072] Among them, P represents active power, Q represents reactive power, and v d It represents the component of the load three-phase voltage under the d axis, i d It represents the component of the three-phase current of the load under the d coordinate axis, v q It represents the component of the load three-phase voltage under the q coordinate axis, i q It represents the component of the load three-phase current under the q coordinate axis.

[0073] Furthermore, the impact power generated by the impact load of the elevator is suppressed by a preset supercapacitor, and the grid-side voltage is sampled to obtain a real-time grid voltage amplitude; that is, the high-speed elevator impact power is smoothed and managed using a supercapacitor. Figure 4 and Figure 5 The topology and control block diagram of the supercapacitor three-level bidirectional DC / DC converter are given respectively.

[0074] In this embodiment, the power command value of the supercapacitor is set to be equal to the impact power, and the power command value of the supercapacitor is divided by the voltage of the supercapacitor to obtain the current command value of the supercapacitor; it can be understood that the power command value P of the supercapacitor is set to be equal to the impact power. sc_ref Equal to the impact power P pulse The power command value P of the super capacitor sc_ref Divide by the supercapacitor voltage U sc , we can get the current command value i of the supercapacitor sc_ref Since the supercapacitor discharge current i is specified sc In the positive direction, combined with the input-output relationship of the three-level bidirectional DC / DC converter, the control structure of charging and discharging is slightly different.

[0075] The discharge control structure is as follows: when impact power is generated, the supercapacitor is discharged, the supercapacitor current command value is subtracted from the supercapacitor current actual value, and after being controlled by the PI controller, it is compared with the carrier to obtain the control signal of the switch tube during discharge. It can be understood that when the ultra-high-speed elevator works in the electric state and impact power is generated, the supercapacitor is discharged to smooth the impact power. When discharging, the supercapacitor current command value i sc_ref The actual value of supercapacitor current i sc The difference is made, and after PI control, it is compared with the carrier to obtain the control signal of the switch tube.

[0076] The specific control structure of charging is that when the ultra-high-speed elevator is working in the power generation state, the supercapacitor is charged. When charging, the actual value of the supercapacitor current i sc and the supercapacitor current command value i sc_ref After the difference is made, it is controlled by PI, and the rest of the control structure is the same as that during discharge, thus obtaining the control signal of the switch tube during charging.

[0077] Furthermore, when the drop in the real-time grid voltage amplitude exceeds a preset drop threshold, it is determined that a sag has occurred in the upper power supply, and a voltage sag detection signal is generated. That is, by sampling the grid-side voltage, the real-time grid voltage amplitude is calculated. When the grid voltage amplitude drops by more than 10% of the rated voltage amplitude, it is determined that a sag has occurred in the upper power supply, and a voltage sag detection signal is generated to control the opening and closing of the grid-connected switch thyristor and the mode switching of the energy storage converter, such as Figure 6 shown.

[0078] Furthermore, the preset supercapacitor internal energy storage converter is switched to an off-grid mode based on the voltage sag detection signal until the upper power supply is detected to be restored, at which point the energy storage converter smoothly transitions to a normal operating mode. That is, after detecting a voltage sag, the switch is switched. At this point, the inverter uses V / f control, and the control loop is a dual voltage and current loop, controlled as a voltage source to provide voltage and frequency support for important loads in the distribution network. At this point, the given value of the positive-sequence loop d-axis voltage is 311, indicating that the energy storage converter outputs a standard voltage with an effective phase voltage value of 220V; the angular frequency is set to 100π, indicating that the output voltage frequency of the energy storage converter is the power frequency of 50Hz. The negative-sequence loop voltage loop command value is set to 0 to ensure that the output voltage of the energy storage converter is not affected when carrying an unbalanced load under an island, remaining stable and balanced, and providing strong support for the load. On the energy storage side, the supercapacitor switches to voltage-current dual closed-loop control, allowing the supercapacitor to quickly provide energy and stabilize the DC bus voltage. At the same time, there is a reset signal in the PI controller, and the command value of the current loop does not change suddenly, so the load voltage does not fluctuate, achieving seamless transition between on-grid and off-grid modes.

[0079] In this embodiment, the above steps solve the power quality disturbance problem of high-speed elevators in super high-rise buildings. It is also necessary to manage the power quality problems caused by distributed power quality disturbance sources in the vertical grid power grid of super high-rise buildings.

[0080] Specifically, the grid distribution data of the super high-rise building is obtained; the grid distribution data is input into the preset convex optimization harmonic and three-phase unbalance control model to obtain the optimal control equipment configuration node; the power quality disturbance source is controlled according to the optimal control equipment configuration node. That is, first, the key nodes of the power quality control equipment configuration need to be determined, such as Figure 2 Taking the common harmonic and three-phase unbalance problems in super high-rise buildings as an example, the relationship between the control equipment and the node voltage in the system in the vertical grid-type harmonic and three-phase unbalance problems is shown in the following formula:

[0081]

[0082]

[0083] in the formula It represents the harmonic voltage of node k before treatment and the harmonic voltage of subharmonic order h. represents the harmonic impedance between nodes k and q, It is the harmonic compensation current of the power quality management equipment configured at node q. and Represents phasors and The phase angle of . Indicates the negative sequence voltage value of k nodes before governance, represents the negative sequence impedance between nodes k and q, It is the negative sequence compensation current of the power quality management equipment configured at node q. and Represents phasors and The phase angle of .

[0084] The effectiveness of power quality control at each node in a vertical grid is related to the installation location and output capacity of the control equipment. By adjusting the amplitude and phase angle of the compensation current, the reduction in each harmonic voltage is maximized, achieving a more significant compensation effect. However, the power quality optimization problem in the above formula is a nonlinear optimization problem and is difficult to solve. By simplifying and transforming, squaring both ends of the objective function to eliminate some phase angle parameters, and simplifying, the following quasi-convex optimization harmonic and three-phase imbalance control model is obtained as shown below:

[0085]

[0086]

[0087] In order to maximize the use of the output capacity of the power quality management equipment, the management coefficient of each candidate bus is calculated based on the above formula. The management coefficient is the partial derivative of the convex optimization model (the above formula) when the compensation current is zero. The smaller the management coefficient of a node, the better the global effect of power quality management at that node. After management, the management coefficient of each node in the system is and The smaller the value, the better the configuration node of the control equipment in the system is determined. The calculation formula of the control coefficient of harmonic and three-phase imbalance problem is as follows:

[0088]

[0089]

[0090] Where m is the number of all nodes in the grid.

[0091] The vertical grid power grid of the super high-rise building after compensation is continuously monitored. When the above-mentioned power quality problems occur in the high-speed elevators and power supply grid of the super high-rise building, the central controller will control and switch the management equipment in the system according to the instructions, and complete the management of key power management in the system in real time.

[0092] like Figure 7 As shown, the present invention also provides a system for managing the power supply quality of a super high-rise building, which is used to implement the method for managing the power supply quality of a super high-rise building, comprising:

[0093] A data detection module, configured to detect elevator power change data in real time, wherein the elevator power change data includes at least load voltage and load current;

[0094] An impact power detection module is used to detect that an impact load is started and determine the impact power generated by the elevator impact load based on the change data of the elevator power; suppress the impact power generated by the elevator impact load through a preset supercapacitor, and sample the grid-side voltage to obtain a real-time grid voltage amplitude;

[0095] The voltage sag detection module is used to determine that a voltage sag has occurred in the upstream power supply when the drop in the real-time grid voltage amplitude exceeds a preset drop threshold value, and to generate a voltage sag detection signal;

[0096] The recovery module is used to switch the preset supercapacitor internal energy storage converter to an off-grid mode according to the voltage sag detection signal until the upper power supply is detected to be restored and the energy storage converter smoothly transitions to a normal operation mode.

[0097] In this embodiment, the impact power detection module is further used to identify the real-time load voltage and load current according to the elevator power change data;

[0098] The real-time load voltage and load current are input into the preset load power model to obtain the active power and reactive power at the corresponding moment, and the sum of the active power and reactive power is output as the load power at that moment;

[0099] The difference between the load power before the impact load and the load power after the impact load is output as the impact power generated by the elevator impact load;

[0100] Wherein, the load power model includes:

[0101]

[0102]

[0103] Among them, P represents active power, Q represents reactive power, and v d It represents the component of the load three-phase voltage under the d axis, i d It represents the component of the three-phase current of the load under the d coordinate axis, v q It represents the component of the load three-phase voltage under the q coordinate axis, i q It represents the component of the load three-phase current under the q coordinate axis.

[0104] Specifically, the impact power detection module is further used to make the power command value of the supercapacitor equal to the impact power, and divide the power command value of the supercapacitor by the voltage of the supercapacitor to obtain the current command value of the supercapacitor;

[0105] When the surge power is generated, the supercapacitor is discharged, and the difference between the supercapacitor current command value and the supercapacitor current actual value is compared with the carrier after being controlled by the PI controller to obtain a control signal for shutting down the supercapacitor during discharge;

[0106] More specifically, the recovery module is further used to obtain power grid distribution data of super high-rise buildings;

[0107] Inputting the power grid distribution data into a preset convex optimization harmonic and three-phase imbalance control model to obtain the optimal control equipment configuration node;

[0108] Controlling the power quality disturbance source according to the optimal control device configuration node;

[0109] The preset convex optimization harmonic and three-phase imbalance control model includes:

[0110]

[0111]

[0112] in, It represents the harmonic voltage of node k before treatment and the harmonic voltage of order h. represents the harmonic impedance between nodes k and q, represents the harmonic compensation current of the power quality control equipment configured at node q, and Represents phasors and The phase angle, Indicates the negative sequence voltage value of k nodes before governance, represents the negative sequence impedance between nodes k and q, Represents the negative sequence compensation current of the power quality management equipment configured at node q, and Represents phasors and The phase angle of .

[0113] It should be noted that the system described in the above embodiment corresponds to the method described in the above embodiment. Therefore, the parts of the system described in the above embodiment that are not described in detail can be obtained by referring to the contents of the method described in the above embodiment, and will not be repeated here.

[0114] In summary, the implementation of the embodiments of the present invention has the following beneficial effects:

[0115] The power quality management method and system provided by this invention for super-high-rise buildings mitigates the bidirectional transient power surges generated by high-speed elevators and provides voltage sag protection for these buildings through the design of management equipment topology and control schemes. Secondly, a comprehensive optimization configuration scheme for power quality management equipment is proposed for distributed disturbance loads within vertical grid power grids, addressing harmonics and three-phase imbalance. This approach achieves a comprehensive improvement in the overall power quality of each node in a super-high-rise building through the coordinated use of a small number of management devices.

[0116] The above disclosure is merely a preferred embodiment of the present invention and certainly cannot be used to limit the scope of the present invention. Therefore, equivalent changes made according to the claims of the present invention are still within the scope of the present invention.

Claims

1. A method for improving the power supply quality of a super high-rise building, characterized in that: include: Real-time detection of elevator power change data, wherein the elevator power change data includes at least load voltage and load current; When it is detected that the impact load is started, determining the impact power generated by the elevator impact load according to the change data of the elevator power; The impact power generated by the impact load of the elevator is suppressed by a preset supercapacitor; Sampling the grid-side voltage to obtain the real-time grid voltage amplitude; When the real-time grid voltage amplitude drops beyond the preset drop threshold, it is determined that the upstream power supply has experienced a temporary sag and a voltage sag detection signal is generated; The preset supercapacitor internal energy storage converter is switched to an off-grid mode according to the voltage sag detection signal until the upper power supply is detected to be restored and the energy storage converter smoothly transitions to a normal operating mode; The power quality data of key nodes in the vertical grid power grid is collected, and an optimization management model for the harmonic and three-phase imbalance problems of the vertical grid power grid is constructed. The gradient descent method is used to determine the optimal installation position and output capacity of the management equipment. The overall comprehensive improvement of the power supply quality of each node in the super high-rise building is achieved through the mutual coordination of a small number of management devices.

2. The method according to claim 1, wherein The determining of the impact power generated by the elevator impact load according to the elevator power change data specifically includes: Identifying real-time load voltage and load current according to the elevator power change data; The real-time load voltage and load current are input into the preset load power model to obtain the active power and reactive power at the corresponding moment, and the sum of the active power and reactive power is output as the load power at that moment; The difference between the load power before the impact load and the load power after the impact load is output as the impact power generated by the elevator impact load.

3. The method according to claim 2, wherein The load power model includes: Among them, P represents active power, Q represents reactive power, and v d It represents the component of the load three-phase voltage under the d axis, i d It represents the component of the three-phase current of the load under the d coordinate axis, v q It represents the component of the load three-phase voltage under the q coordinate axis, i q Represents the component of the load three-phase current under the q coordinate axis.

4. The method according to claim 1, wherein The method of suppressing the impact power generated by the elevator impact load by using a preset supercapacitor specifically includes: Setting the power command value of the supercapacitor to be equal to the impact power, and dividing the power command value of the supercapacitor by the voltage of the supercapacitor to obtain the current command value of the supercapacitor; When the surge power is generated, the supercapacitor is discharged, and the difference between the supercapacitor current command value and the supercapacitor current actual value is compared with the carrier after being controlled by the PI controller to obtain the control signal of the switch tube; The control signal of the second switch tube is half a switching cycle different from the control signal of the first switch tube, and the carrier is delayed by half a cycle and then compared with the output result of the PI controller to obtain the control signal of the second switch tube during discharge; The corresponding first switching tube and second switching tube are controlled according to the control signal of the first switching tube and the control signal of the second switching tube.

5. The method according to claim 1, wherein Also includes: Obtain power grid distribution data for super high-rise buildings; Inputting the power grid distribution data into a preset convex optimization harmonic and three-phase imbalance control model to obtain the optimal control equipment configuration node; The power quality disturbance source is managed according to the optimal management device configuration node.

6. The method according to claim 5, wherein The preset convex optimization harmonic and three-phase imbalance control model includes: in, It represents the harmonic voltage of node k before treatment and the harmonic voltage of order h. represents the harmonic impedance between nodes k and q, represents the harmonic compensation current of the power quality control equipment configured at node q, and Represents phasors and The phase angle, Indicates the negative sequence voltage value of k nodes before governance, represents the negative sequence impedance between nodes k and q, Represents the negative sequence compensation current of the power quality management equipment configured at node q, and Represents phasors and The phase angle of .

7. A system for managing the power supply quality of a super high-rise building, for implementing the method according to any one of claims 1 to 6, characterized in that: include: A data detection module, configured to detect elevator power change data in real time, wherein the elevator power change data includes at least load voltage and load current; An impact power detection module is used to detect that an impact load is started, determine the impact power generated by the elevator impact load according to the change data of the elevator power; and suppress the impact power generated by the elevator impact load through a preset supercapacitor; And sample the grid side voltage to obtain the real-time grid voltage amplitude; The voltage sag detection module is used to determine that a voltage sag has occurred in the upstream power supply when the drop in the real-time grid voltage amplitude exceeds a preset drop threshold value, and generate a voltage sag detection signal; The recovery module is used to switch the preset supercapacitor internal energy storage converter to an off-grid mode according to the voltage sag detection signal until the upper power supply is detected to be restored and the energy storage converter smoothly transitions to a normal operation mode.

8. The system according to claim 7, wherein: The impact power detection module is further used to identify the real-time load voltage and load current according to the change data of the elevator power; The real-time load voltage and load current are input into the preset load power model to obtain the active power and reactive power at the corresponding moment, and the sum of the active power and reactive power is output as the load power at that moment; The difference between the load power before the impact load and the load power after the impact load is output as the impact power generated by the elevator impact load; Wherein, the load power model includes: Among them, P represents active power, Q represents reactive power, and v d It represents the component of the load three-phase voltage under the d coordinate axis, i d It represents the component of the load three-phase current under the d coordinate axis, v q It represents the component of the load three-phase voltage under the q coordinate axis, i q It represents the component of the load three-phase current under the q coordinate axis.

9. The system according to claim 8, wherein The impact power detection module is further used to make the power command value of the supercapacitor equal to the impact power, and divide the power command value of the supercapacitor by the voltage of the supercapacitor to obtain the current command value of the supercapacitor; When impact power is generated, the supercapacitor discharges, and the difference between the supercapacitor current command value and the supercapacitor current actual value is compared with the carrier after being controlled by a PI controller to obtain a control signal for the switch tube.

10. The system according to claim 7, wherein: The recovery module is also used to perform analytical optimization on the convex optimization harmonic and three-phase imbalance control model for the vertical grid power grid to obtain the optimal control equipment configuration nodes and output capacity; The power quality disturbance source is managed according to the optimal management device configuration node.

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