Power distribution area low voltage treatment method and system based on intelligent compensation principle, medium, equipment and product

Abstract

The invention discloses a power distribution area low-voltage treatment method and system based on an intelligent compensation principle, a medium, equipment and a product in the technical field of charging equipment diagnosis. The method comprises the following steps: when the bus voltage of a power distribution area exceeds a set maximum range, performing dynamic voltage compensation according to a voltage deviation between the bus voltage of the power distribution area and a set voltage; when the bus voltage of the power distribution area exceeds the set lowest range, dynamic voltage compensation is carried out according to the line voltage drop of the bus; performing dynamic harmonic suppression according to the bus load current of the power distribution area; performing dynamic reactive compensation according to the reactive voltage and the reactive current of the power distribution area; and performing dynamic neutral current elimination according to the three-phase current of the power distribution area.

Description

Technical Field

[0001] This invention relates to the field of power grid technology, and in particular to a method, system, medium, equipment and product for managing low voltage in distribution substations based on the principle of intelligent compensation. Background Technology

[0002] Power quality issues in distribution substations have long plagued the stable operation of power systems and the user experience, especially in scenarios with long power supply radii, large load fluctuations, or distributed photovoltaic (PV) integration. Problems such as low voltage, three-phase imbalance, harmonic pollution, and excessive neutral current are particularly prominent. Traditional solutions mainly rely on manual voltage regulation or line modifications. However, manual voltage regulation requires frequent power outages, cannot dynamically respond to load changes, and is difficult to effectively solve low voltage problems. While line modifications can alleviate some low voltage issues, they are costly, time-consuming, and place pressure on the distribution network design.

[0003] Furthermore, the rapid development of distributed photovoltaic (PV) systems has exacerbated voltage exceedance and reactive power imbalance problems. Traditional equipment struggles to simultaneously address voltage regulation, harmonic suppression, reactive power compensation, and neutral current control, resulting in complex operation and maintenance and insufficient reliability. Existing technologies for controlling harmonic pollution and reactive power losses typically have limited functionality, slow response times, and difficulty adapting to rapidly changing load demands. Problems such as cable overheating, insulation aging, and zero-point drift caused by excessive neutral current remain unresolved, increasing the risk of electrical fires. Existing control devices often require manual intervention, necessitating power outages for maintenance, severely impacting the continuity and reliability of the power distribution system. Summary of the Invention

[0004] The purpose of this invention is to overcome the shortcomings of the prior art and provide a method, system, medium, equipment and product for low voltage management in distribution transformer areas based on the principle of intelligent compensation, so as to achieve comprehensive optimization of power quality and power safety in distribution transformer areas.

[0005] To solve the above-mentioned technical problems, the present invention is implemented using the following technical solution:

[0006] In a first aspect, the present invention provides a method for managing low voltage in distribution transformer areas based on the principle of intelligent compensation, comprising:

[0007] When the bus voltage of the distribution substation exceeds the set maximum range, dynamic voltage compensation is performed based on the voltage deviation between the bus voltage of the distribution substation and the set voltage.

[0008] When the bus voltage of the distribution area exceeds the set minimum range, dynamic voltage compensation is performed based on the line voltage drop of the bus.

[0009] Dynamic harmonic suppression is performed based on the bus load current of the distribution station area;

[0010] Dynamic reactive power compensation is performed based on the reactive voltage and reactive current of the distribution substation.

[0011] Dynamic neutral current elimination is performed based on the three-phase current of the distribution station area.

[0012] Optionally, the dynamic voltage compensation based on the voltage deviation between the bus voltage of the distribution substation and the set voltage includes:

[0013] Real-time calculation of the voltage deviation between the bus voltage and the set voltage of the distribution transformer area;

[0014] A compensation voltage opposite to the voltage deviation is generated by a power electronic voltage regulator;

[0015] The compensation voltage is coupled to the power distribution system of the distribution substation using a high-frequency transformer, so that the instantaneous voltage of the busbar is stabilized within a set range;

[0016] The voltage deviation is obtained by the following formula:

[0017] ,

[0018] in, Indicates voltage deviation. Indicates bus voltage. Indicates the set voltage;

[0019] The compensation voltage is obtained by the following formula:

[0020] ,

[0021] in, Indicates the compensation voltage;

[0022] The instantaneous voltage of the bus is obtained by the following formula:

[0023] ,

[0024] in, This represents the instantaneous voltage of the bus.

[0025] Optionally, the dynamic voltage compensation based on the line voltage drop of the bus includes:

[0026] Calculate the line voltage drop of the busbar based on the busbar load current and the line impedance;

[0027] By injecting a compensation voltage equal in magnitude and opposite in direction to the line voltage drop through a coupling transformer, the bus voltage is increased to over 210 volts.

[0028] The voltage drop across the line is obtained using the following formula:

[0029] ,

[0030] in, This indicates the line voltage drop. Indicates the bus load current. This indicates the line impedance.

[0031] Optionally, the dynamic harmonic suppression based on the harmonic current of the distribution station area includes:

[0032] By performing Fourier transform decomposition on the bus load current in the distribution substation, the 3rd, 5th and 7th harmonic currents are obtained.

[0033] An active filter circuit is used to generate a reverse compensation current that is equal in magnitude but opposite in direction to the 3rd, 5th, and 7th harmonic currents.

[0034] Injecting the reverse compensation current into the power distribution system of the distribution area increases the harmonic suppression rate to 95% and reduces the total harmonic distortion rate to 5%.

[0035] The reverse compensation current is obtained by the following formula:

[0036] ,

[0037] in, Indicates reverse compensation current. Indicates harmonic current;

[0038] The harmonic suppression rate is obtained by the following formula:

[0039] ,

[0040] in, Indicates the harmonic suppression rate. Represents residual harmonic current;

[0041] The total harmonic distortion rate is obtained by the following formula:

[0042] ,

[0043] in, Indicates the total harmonic distortion rate. This represents the fundamental current.

[0044] Optionally, the dynamic reactive power compensation based on the reactive voltage and reactive current of the distribution substation includes:

[0045] Calculate the reactive power based on the reactive voltage and reactive current of the distribution station area;

[0046] By using the inverter to quickly switch and control the switching of capacitor banks, the reactive current in the distribution transformer area is reduced, the power factor of the distribution transformer area is improved to above 0.95, the total reactive power of the distribution transformer area approaches zero, and the line loss of the distribution transformer area is reduced to within 1.3%.

[0047] The reactive power is obtained by the following formula:

[0048] ,

[0049] in, Indicates reactive power. Indicates the effective value of reactive voltage. This represents the effective value of the reactive current. This represents the phase difference angle between reactive voltage and reactive current.

[0050] The power factor is ;

[0051] The line loss is obtained using the following formula:

[0052] ,

[0053] in, Indicates line loss. This indicates the line resistance.

[0054] Optionally, the dynamic neutral current elimination based on the three-phase current of the distribution substation includes:

[0055] The vector sum of the three-phase currents is used as the neutral current. The load control module dynamically generates the three-phase compensation current and distributes it to each phase, so that the compensated neutral current approaches 0 and the three-phase imbalance is reduced to below 30%.

[0056] The neutral current is obtained by the following formula:

[0057] ,

[0058] in, Indicates the neutral current. express Phase current, express Phase current, express Phase current;

[0059] The compensated neutral current is obtained by the following formula:

[0060] ,

[0061] in, This represents the neutral current after compensation. express Phase compensation current, express Phase compensation current, express Phase compensation current.

[0062] The three-phase unbalance is obtained by the following formula:

[0063] ,

[0064] in, Indicates the degree of three-phase imbalance. This represents the function that takes the maximum value. express Phase current, express Phase current, express Phase current, This represents the average value of the three-phase current.

[0065] Secondly, the present invention provides a distribution transformer substation low-voltage management system based on the intelligent compensation principle, applicable to the distribution transformer substation low-voltage management method based on the intelligent compensation principle described in any one of the first aspects, comprising:

[0066] The voltage compensation module is used for: dynamic voltage compensation based on the voltage deviation between the bus voltage of the distribution substation and the set voltage when the bus voltage of the distribution substation exceeds the set maximum range; and dynamic voltage compensation based on the line voltage drop of the bus when the bus voltage of the distribution substation exceeds the set minimum range.

[0067] The harmonic suppression module is used to: dynamically suppress harmonics based on the bus load current of the distribution substation;

[0068] The reactive power compensation module is used to perform dynamic reactive power compensation based on the reactive voltage and reactive current of the distribution substation.

[0069] The neutral current elimination module is used to dynamically eliminate neutral current based on the three-phase current of the distribution substation.

[0070] Thirdly, the present invention provides a computer-readable storage medium storing computer instructions thereon, characterized in that, when the computer instructions are executed by a processor, they implement the steps of the distribution substation low voltage management method based on the intelligent compensation principle described in any of the first aspects.

[0071] Fourthly, the present invention provides a computer device, characterized in that it comprises:

[0072] Memory, used to store computer instructions;

[0073] A processor for executing the computer instructions to implement the steps of the distribution substation low voltage management method based on the intelligent compensation principle as described in any one of the first aspects.

[0074] Fifthly, the present invention provides a computer program product, including computer instructions, characterized in that, when the computer instructions are executed by a processor, they implement the steps of the distribution substation low voltage management method based on the intelligent compensation principle as described in the first aspect.

[0075] Compared with existing technologies, the beneficial effects achieved by this invention are as follows:

[0076] 1. By real-time monitoring of voltage, current, and reactive power, combined with dynamic voltage compensation, harmonic suppression, reactive power regulation, and neutral current elimination functions, this invention effectively solves problems such as low voltage, three-phase imbalance, harmonic pollution, and excessive neutral current in distribution substations caused by long power supply radius, load fluctuations, or photovoltaic backfeed. Compared with traditional manual adjustment or line modification, this invention can achieve rapid and continuous voltage regulation without power outages, significantly improving the voltage qualification rate and ensuring the normal operation of user equipment. At the same time, it reduces operation and maintenance costs and the need for manual intervention through fully automated operation.

[0077] 2. Through power electronic voltage regulators and high-frequency transformer coupling technology, a rapid response of less than 5 milliseconds is achieved, enabling dynamic adaptation to voltage fluctuations caused by load changes and photovoltaic backfeeding. This is particularly suitable for distribution substations with long power supply radii or distributed photovoltaic access. Simultaneously, active filtering and reactive power compensation technologies suppress 3rd, 5th, and 7th harmonics and optimize the power factor, reducing line losses, purifying current waveforms, and improving power quality. Furthermore, load regulation eliminates neutral current, effectively preventing cable overheating and zero-point drift, reducing the risk of electrical fires, and providing safety guarantees for the distribution system and user electricity consumption. Attached Figure Description

[0078] Figure 1 This is a flowchart of a low-voltage management method for distribution substations based on the principle of intelligent compensation, provided according to an embodiment of the present invention.

[0079] Figure 2 This is a comparison chart of the three-phase imbalance before and after the use of low voltage management in the distribution substation on April 30, according to an embodiment of the present invention.

[0080] Figure 3 This is a comparison chart of three-phase current fluctuations before and after the application of low voltage management in a distribution substation on April 30, according to an embodiment of the present invention.

[0081] Figure 4 This is a comparison chart of three-phase current fluctuations before and after the application of low voltage management in a distribution substation on August 17, according to an embodiment of the present invention. Detailed Implementation

[0082] The technical solution of the present invention will be described in detail below with reference to the accompanying drawings and specific embodiments. It should be understood that the embodiments of the present invention and the specific features in the embodiments are detailed descriptions of the technical solution of the present invention, rather than limitations thereof. In the absence of conflict, the embodiments of the present invention and the technical features in the embodiments can be combined with each other.

[0083] It should be noted that the term "and / or" in this article is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, or B existing alone. Additionally, the character " / " in this article generally indicates that the preceding and following related objects have an "or" relationship.

[0084] Example 1:

[0085] This invention discloses a method for managing low voltage in distribution transformer areas based on the principle of intelligent compensation, with reference to... Figure 1 As shown, it includes:

[0086] S1, When the bus voltage of the distribution station exceeds the set maximum range, dynamic voltage compensation is performed based on the voltage deviation between the bus voltage of the distribution station and the set voltage.

[0087] S2, when the bus voltage of the distribution area exceeds the set minimum range, dynamic voltage compensation is performed based on the line voltage drop of the bus.

[0088] S3, dynamic harmonic suppression based on the bus load current of the distribution station area;

[0089] S4, performs dynamic reactive power compensation based on the reactive voltage and reactive current of the distribution substation.

[0090] S5 performs dynamic neutral current elimination based on the three-phase current of the distribution station area.

[0091] Specifically, high-precision sensors are used to collect the bus voltage, three-phase current, bus load current, reactive voltage, and reactive current of the distribution substation. In step S1, the dynamic voltage compensation based on the voltage deviation between the bus voltage of the distribution substation and the set voltage includes:

[0092] Real-time calculation of the voltage deviation between the bus voltage and the set voltage of the distribution substation:

[0093] ,

[0094] in, Indicates voltage deviation. Indicates bus voltage. Indicates the set voltage;

[0095] A compensation voltage opposite to the voltage deviation is generated by a power electronic voltage regulator:

[0096] ,

[0097] in, Indicates the compensation voltage;

[0098] The compensation voltage is coupled to the power distribution system of the distribution substation using a high-frequency transformer, so that the instantaneous voltage of the busbar is stabilized within a set range, and the compensation voltage adjustment range is ±10%.

[0099] ,

[0100] in, This represents the instantaneous voltage of the bus.

[0101] In step S2, the dynamic voltage compensation based on the line voltage drop of the bus includes:

[0102] Calculate the line voltage drop of the busbar based on the busbar load current and line impedance:

[0103] ,

[0104] in, This indicates the line voltage drop. Indicates the bus load current. Indicates line impedance;

[0105] By injecting a compensation voltage equal in magnitude but opposite in direction to the line voltage drop through a coupling transformer, the bus voltage is increased to over 210 volts.

[0106] In step S3, the dynamic harmonic suppression based on the harmonic current of the distribution station area includes:

[0107] By performing Fourier transform decomposition on the bus load current in the distribution substation, the 3rd, 5th and 7th harmonic currents are obtained.

[0108] An active filter circuit is used to generate a reverse compensation current that is equal in magnitude but opposite in direction to the 3rd, 5th, and 7th harmonic currents:

[0109] ,

[0110] in, Indicates reverse compensation current. Represents harmonic current

[0111] Injecting the reverse compensation current into the power distribution system of the distribution substation improves the harmonic suppression rate to over 95%, reduces the total harmonic distortion rate to below 5%, and purifies the line current waveform; wherein the harmonic suppression rate is obtained by the following formula:

[0112] ,

[0113] in, Indicates the harmonic suppression rate. Represents residual harmonic current;

[0114] The total harmonic distortion rate is obtained by the following formula:

[0115] ,

[0116] in, Indicates the total harmonic distortion rate. This represents the fundamental current.

[0117] In step S4, the dynamic reactive power compensation based on the reactive voltage and reactive current of the distribution substation includes:

[0118] Real-time monitoring of reactive voltage and reactive current in the distribution transformer area;

[0119] Calculate the reactive power based on the reactive voltage and reactive current of the distribution substation:

[0120] ,

[0121] in, Indicates reactive power. Indicates the effective value of reactive voltage. This represents the effective value of the reactive current. This represents the phase difference angle between reactive voltage and reactive current.

[0122] By using inverters to quickly switch capacitor banks, reactive current in the distribution substation can be reduced, thereby improving the power factor of the distribution substation. By increasing the reactive power of the distribution transformer area to above 0.95, the total reactive power of the distribution transformer area approaches zero, reducing the line loss of the distribution transformer area to below 1.3%.

[0123] ,

[0124] in, Indicates line loss. This indicates the line resistance.

[0125] In step S5, the dynamic neutral current elimination based on the three-phase current of the distribution substation includes:

[0126] Real-time monitoring of the three-phase current in the distribution substation area;

[0127] The vector sum of the three-phase currents is used as the neutral current. The load control module (based on the three-phase current balancer) dynamically generates the three-phase compensation current and distributes it to each phase, so that the compensated neutral current approaches 0, the three-phase imbalance is reduced to below 30%, and cable heating, insulation aging and zero-point drift are prevented. The neutral voltage to ground is ensured to be less than the safety threshold, reducing the risk of electrical fire.

[0128] The neutral current is obtained by the following formula:

[0129] ,

[0130] in, Indicates the neutral current. express Phase current, express Phase current, express Phase current;

[0131] The compensated neutral current is obtained by the following formula:

[0132] ,

[0133] in, This represents the neutral current after compensation. express Phase compensation current, express Phase compensation current, express Phase compensation current.

[0134] The three-phase unbalance is obtained by the following formula:

[0135] ,

[0136] in, Indicates the degree of three-phase imbalance. This represents the function that takes the maximum value. express Phase current, express Phase current, express Phase current, This represents the average value of the three-phase current.

[0137] Example 2:

[0138] This invention provides a method for managing low voltage in distribution transformer areas based on the principle of intelligent compensation, which is applied to the Qiancanglong distribution transformer of a power supply company.

[0139] The transformer in this distribution substation has a capacity of 400kVA and mainly serves residential users. The load is primarily single-phase, leading to severe three-phase imbalance, low terminal voltage (as low as approximately 190V), low power factor (approximately 0.85), and excessive neutral current (up to approximately 80A), accompanied by 3rd, 5th, and 7th harmonic pollution. A low-voltage management method based on intelligent compensation principles is employed to stabilize the terminal voltage, balance the three-phase current, suppress harmonics, optimize reactive power, and eliminate neutral current, thereby improving power quality, reducing line losses, and ensuring electrical safety.

[0140] The real-time monitoring system hardware includes high-precision voltage transformers (VT), current transformers (CT), analog-to-digital converters (ADC, sampling rate >10kHz), and embedded microcontrollers (MCU, processing frequency 100MHz).

[0141] High-precision voltage transformers (VTs) and current transformers (CTs) acquire the bus voltage of the distribution substation at a sampling rate greater than 10 kHz. reactive voltage reactive current Three-phase current and bus load current The ADC converts the analog signal into a digital signal, and the MCU uses the Fast Fourier Transform (FFT) algorithm to decompose the harmonic current and calculate the three-phase imbalance. The response time is less than 5ms, capturing rapid load changes and high-frequency harmonics. The data accuracy is high, with an error of <0.1%, providing a reliable basis for subsequent compensation.

[0142] The hardware of the dynamic voltage compensation system includes an IGBT inverter-based power electronic voltage regulator, a 10kHz high-frequency coupling transformer, and a DSP controller.

[0143] Compare bus voltage With set voltage =220V, calculate voltage deviation The DSP controller generates control signals using a proportional-integral-derivative (PID) algorithm, which drives the IGBT inverter to produce compensation voltage. Coupled to the system via a high-frequency transformer, so that Fast response ensures instantaneous voltage stability, with an adjustment range of ±10%, suitable for dynamic load changes.

[0144] The harmonic suppression system hardware includes: an active power filter (APF, based on IGBT), a harmonic detection module, and a PWM controller. Harmonic currents are obtained by decomposing the bus load current using an FFT algorithm. Generate reverse compensation current Injecting into the power distribution system brings the total harmonic current close to zero, achieving a suppression rate of... ,in This is for residual harmonic current. It effectively reduces the total harmonic distortion (THD) to below 5%, purifies the current waveform, and reduces equipment overheating and electromagnetic interference.

[0145] Reactive power compensation system hardware includes: reactive power compensation capacitor bank, IGBT inverter, and power factor detection module. It detects reactive power. Injection to compensate reactive power This improves the power factor to above 0.95 and reduces line losses. ,in This indicates the line resistance. Reducing reactive current transmission lowers line voltage drop and improves system efficiency.

[0146] The hardware components of the neutral current elimination system include: a load control module (based on a three-phase current balancer), a current sensor, and a DSP controller.

[0147] Monitor three-phase current and calculate neutral current. The compensation current is distributed through the control module. ,make Eliminating neutral current prevents zero-point drift and cable overheating, reducing the risk of electrical fires.

[0148] The hardware equipment for the automated control and bypass protection system includes: an intelligent control unit (MCU+FPGA), a temperature sensor, a bypass relay, and a modular circuit board. The MCU collects load power and temperature data in real time, while the FPGA executes an adaptive optimization algorithm to automatically adjust compensation parameters. The bypass relay switches to bypass mode in case of a fault, ensuring continuous system operation. Fully automated operation reduces manual intervention, and bypass protection and modular design enable zero-downtime maintenance, with maintenance time less than 30 minutes.

[0149] The implementation steps are as follows:

[0150] Real-time monitoring is implemented by deploying voltage transformers, current transformers, and ADCs to collect bus voltage, three-phase current, bus load current, reactive voltage, and reactive current. The three-phase imbalance is calculated using an MCU to ensure monitoring accuracy and response speed.

[0151] Dynamic voltage compensation, comparison and =220V, calculate Generate through IGBT inverter and high-frequency transformer Stabilize the instantaneous voltage of the bus.

[0152] Harmonic suppression, detected by FFT ,generate Injected into the power distribution system, reducing THD to below 5%.

[0153] Reactive power regulation: detection ,injection Improve power factor and reduce .

[0154] Neutral current elimination: Calculation ,distribute This brings the neutral current close to zero.

[0155] Automated operation and protection are achieved through the optimization and adjustment of parameters via MCU and FPGA, speed-regulating heat dissipation via temperature sensors, and the bypass relay switching to bypass mode in case of a fault.

[0156] The above method achieves comprehensive power quality management through a closed-loop control system. A real-time monitoring system collects voltage, current, and harmonic data from distribution substations. MCUs and FFT algorithms analyze three-phase unbalance and harmonic components, providing accurate input for subsequent compensation. A dynamic voltage compensation system generates compensation voltage through PID control and IGBT inverters, coupling it to the stable terminal voltage of the system. A harmonic suppression system uses an APF to cancel harmonic currents and purify the waveform. A reactive power compensation system optimizes the power factor and reduces losses. A neutral current elimination system balances the three-phase current and eliminates neutral overcurrent. An automated control system optimizes operating parameters through adaptive algorithms, and bypass protection ensures continuous system operation during faults. These systems work synergistically to form a multi-functional integrated management mechanism.

[0157] Specifically, by integrating voltage compensation, harmonic suppression, reactive power regulation, and neutral current elimination, the power quality of the distribution substation is significantly improved, resolving issues such as low voltage, three-phase imbalance, harmonic pollution, and neutral overcurrent. Fully automated operation and rapid response ensure dynamic adaptation to complex operating conditions, while bypass protection and modular design achieve zero-outage maintenance, reducing operation and maintenance costs. This comprehensive management mechanism not only improves voltage qualification rate and system efficiency but also significantly reduces the risk of electrical fires, extends equipment lifespan, and provides reliable protection for residential electricity use and the operation of the power distribution system.

[0158] The specific synergistic effects are as follows:

[0159] Synergistic effect of real-time monitoring and dynamic voltage compensation

[0160] Step 2: Real-time monitoring of bus voltage, three-phase current, bus load current, reactive voltage, and reactive current using high-precision sensors; calculation of three-phase imbalance and line voltage drop; response time less than 5 milliseconds. Step 3: Real-time comparison of bus voltage with set voltage; calculation of voltage deviation; generation of compensation voltage using power electronic voltage regulator and high-frequency transformer to stabilize instantaneous bus voltage.

[0161] Real-time monitoring provides a precise data foundation for dynamic voltage compensation, ensuring that the compensated voltage can respond quickly and accurately to voltage fluctuations in the distribution area. The high precision and rapid response of the monitoring process enable voltage compensation to follow load changes or voltage anomalies caused by photovoltaic backfeeding in real time, forming a closed-loop control system.

[0162] Traditional voltage regulation methods, such as manual adjustment, typically have response times on the order of minutes. This new method, through its synergistic effect, reduces the response time to the order of milliseconds, significantly decreasing the impact of voltage fluctuations on user equipment. This is particularly beneficial during peak loads or solar backfeed scenarios, where voltage stabilization time is reduced from several minutes to instantaneous. Real-time monitoring captures nonlinear voltage changes caused by distributed photovoltaic or seasonal loads, and dynamic compensation precisely matches these changes, solving the problem of traditional methods failing under complex operating conditions.

[0163] Synergistic effect of dynamic voltage compensation and harmonic suppression

[0164] Step 3: Dynamically compensate the voltage to stabilize the instantaneous bus voltage within the range of 220V to 230V. Step 4: Decompose the 3rd, 5th, and 7th harmonic currents using Fourier transform to generate reverse compensation current, suppressing harmonics to over 95%.

[0165] Voltage compensation stabilizes the system voltage through power electronic voltage regulators and high-frequency transformers, while harmonic suppression purifies the current waveform through active filter circuits. Together, they improve power quality. Voltage compensation ensures the system operates within a stable voltage range, providing a stable working environment for harmonic suppression; harmonic suppression reduces voltage waveform distortion, which in turn enhances the accuracy and stability of voltage compensation.

[0166] Harmonic suppression reduces the total harmonic distortion (THD), making the voltage waveform closer to a sine wave, reducing error accumulation in the voltage compensation module, and thus improving the accuracy of voltage regulation. This synergistic effect significantly reduces interference from nonlinear loads to the power grid. The implementation of harmonic suppression reduces equipment overheating and insulation aging caused by harmonics. Combined with stable voltage output, it significantly extends the service life of user equipment and power distribution equipment, reducing maintenance costs.

[0167] Synergistic effect of dynamic voltage compensation, reactive power regulation and neutral current elimination

[0168] Step 3: Dynamically compensate voltage to stabilize the terminal voltage. Step 5: Dynamically inject and compensate reactive power to improve the power factor to above 0.95 and reduce line losses. Step 6: Eliminate neutral current through load regulation to prevent cable overheating and zero-point drift.

[0169] Voltage compensation stabilizes the terminal voltage by regulating voltage deviation, reactive power regulation reduces reactive current transmission losses by optimizing the power factor, and neutral current elimination reduces neutral overcurrent by redistributing the three-phase current. These three elements form a comprehensive optimization system: voltage compensation provides a stable voltage base, reactive power regulation reduces line current, thereby reducing voltage drop, and neutral current elimination further optimizes current distribution, alleviating the load pressure on lines and transformers.

[0170] Reactive power regulation reduces reactive current in the line, lowers line voltage drop, and thus reduces the workload of the voltage compensation module; neutral current elimination further optimizes three-phase balance, reducing additional losses caused by imbalance. This triple synergistic effect significantly reduces line losses, far exceeding the effect of single reactive power compensation or voltage regulation. Neutral current elimination solves the problems of zero-point drift and cable overheating. Combined with the reduced line current from reactive power regulation and the stability of voltage compensation, it forms a multi-layered safety protection, significantly reducing the risk of electrical fires. Traditional methods cannot achieve such comprehensive safety assurance.

[0171] Synergistic effect of fully automated operation and bypass protection

[0172] Step 7: The intelligent control system collects load power and temperature in real time, automatically optimizes and adjusts parameters, and achieves fully automated operation. Step 8: Configure a bypass circuit; in case of a fault, it automatically switches to bypass mode, supporting single-person pole-mounted maintenance without power outages.

[0173] Fully automated operation achieves real-time parameter optimization through an intelligent control system, reducing manual intervention and improving operational efficiency; bypass protection ensures continuous operation of the power distribution system in the event of equipment failure, and modular design reduces maintenance difficulty. Together, these features enhance the system's reliability and ease of operation and maintenance.

[0174] The combination of automated operation and bypass protection enables equipment maintenance without power outages. Traditional methods typically involve power outages of 5 minutes or more, while this method achieves "zero-outage" maintenance, significantly improving the power supply reliability of the power distribution system. Modular design and single-person maintenance combined with automated operation reduce the workload and skill requirements of maintenance personnel. The maintenance of traditional multi-functional equipment often requires multiple people to work together, while this method enables rapid single-person maintenance, significantly reducing operation and maintenance costs.

[0175] In the above embodiments, real-time monitoring relies on high-precision sensors (such as voltage transformers and current transformers) and a fast signal processing unit. Analog-to-digital converters (ADCs) are used to acquire three-phase voltage, current, and harmonic data at a high sampling rate. The monitoring system decomposes the harmonic components using Fourier transform and calculates the three-phase imbalance. Dynamic voltage compensation, based on the monitoring data, uses a power electronic voltage regulator to generate a compensation voltage opposite to the voltage deviation, which is coupled to the power distribution system through a high-frequency transformer.

[0176] The monitoring system's rapid response ensures real-time capture of voltage deviations. The deviation signal is converted into a control signal through a proportional-integral-derivative (PI-DE) control algorithm, driving the inverter to generate a compensation voltage. The phase of the compensation voltage is synchronized with the system voltage and is directly superimposed on the bus voltage through the electromagnetic coupling of the high-frequency transformer, forming a closed-loop control system. This rapid closed-loop mechanism ensures that voltage fluctuations are instantaneously suppressed, making it particularly suitable for scenarios involving photovoltaic backfeeding or sudden load changes. Traditional methods, such as mechanical voltage regulation, rely on discrete voltage level adjustments, making it difficult to cope with millisecond-level voltage fluctuations. In contrast, this method's rapid monitoring and compensation form a real-time feedback loop, significantly improving the dynamic performance of voltage stability and solving the voltage limit exceedance problem under complex operating conditions.

[0177] Dynamic voltage compensation generates a compensation voltage through a power electronic voltage regulator to stabilize the system voltage. Harmonic suppression uses an active power filter (APF) to detect the 3rd, 5th, and 7th harmonic currents generated by nonlinear loads such as photovoltaic inverters, and generates a reverse compensation current to cancel the harmonics. The harmonic suppression module decomposes the current waveform based on the Fast Fourier Transform (FFT) algorithm, identifies harmonic components, and controls the inverter output reverse current using pulse width modulation (PWM) technology. Voltage compensation provides a stable voltage reference for harmonic suppression, avoiding harmonic detection errors caused by voltage fluctuations; harmonic suppression reduces voltage waveform distortion by purifying the current waveform, thus reducing the difficulty of controlling the compensation voltage. The synergistic effect of these two mechanisms forms a mutually reinforcing system: a stable voltage environment improves the accuracy of harmonic suppression, while low harmonic currents, in turn, reduce nonlinear interference from voltage compensation. This mutually beneficial mechanism significantly improves power quality. Harmonic suppression reduces the total harmonic distortion (THD), making the voltage waveform closer to an ideal sine wave, and reducing electromagnetic interference and equipment losses caused by harmonics. The stable voltage further reduces the computational burden of the harmonic suppression module, allowing it to focus on managing higher-order harmonics, thereby achieving comprehensive optimization of power quality.

[0178] Voltage compensation stabilizes the terminal voltage by injecting a voltage opposite to the line voltage drop through a coupling transformer. Reactive power regulation improves the power factor by detecting reactive power and calculating the phase difference between voltage and current, then injecting compensating reactive power. Neutral current elimination dynamically distributes compensating current by monitoring the vector sum of the three-phase currents, bringing the neutral current close to zero. Voltage compensation, by stabilizing the terminal voltage, reduces the impact of line voltage drop on current distribution, providing a stable operating environment for reactive power regulation and neutral current elimination. Reactive power regulation, by injecting compensating reactive power, reduces reactive current in the line, thereby reducing total current and line voltage drop, further alleviating the burden on voltage compensation. Neutral current elimination, by redistributing three-phase current, optimizes current balance, reducing additional reactive power demand and voltage fluctuations caused by imbalance. These three components form a multivariable optimization system, achieving coordinated optimization of voltage, current, and power factor through real-time feedback control. Reactive power regulation and neutral current elimination together reduce total line current, reducing line heating and losses. Combined with the stability of voltage compensation, this forms a multi-level power quality optimization mechanism. This synergistic effect not only improves the voltage qualification rate, but also significantly reduces the risk of electrical fires, because neutral current elimination directly solves the problems of zero drift and cable overheating, while traditional methods usually only focus on a single problem and are difficult to achieve such a comprehensive effect.

[0179] Fully automated operation uses an intelligent control system to collect load power, voltage, current, and module temperature in real time, and employs adaptive algorithms to optimize adjustment parameters. Bypass protection automatically switches to bypass mode in case of equipment failure through an independent bypass circuit and fault detection module, ensuring continuous system operation. Automated operation optimizes operating parameters for voltage compensation, harmonic suppression, and reactive power regulation through real-time data analysis and adaptive control, reducing the need for manual intervention. Bypass protection ensures that equipment failure does not affect grid operation through rapid fault detection and relay switching. Modular design eliminates the need to disassemble the entire system for maintenance, and combined with the temperature-controlled speed regulation function of automated operation, it extends equipment life. The two work together to form a system architecture with high reliability and low maintenance costs. Real-time optimization by automated operation reduces ineffective power consumption during equipment operation, while bypass protection ensures power supply continuity in fault scenarios. The combination of the two achieves "zero power outage" maintenance, completely changing the limitation of traditional methods that require power outages for maintenance. In addition, the synergy between modular design and automated operation lowers the technical threshold for maintenance, allowing a single person to quickly complete maintenance, significantly improving maintenance efficiency.

[0180] like Figure 2-4 By comparing actual operating data before and after the installation of the end-point power consumption management device, the effectiveness of the device in managing electricity consumption was verified. The comparison showed that the three-phase currents (phase A, phase B, and phase C) tended to be balanced after the device was installed, and the imbalance was significantly reduced. The data fluctuations after installation were smaller, and the system operation was more stable.

[0181] On April 30th, baseline data prior to equipment installation showed significant fluctuations in the three-phase current, indicating a clear imbalance. Phase C current was significantly higher than phases A and B, demonstrating a severe three-phase imbalance. The large fluctuations in current values ​​led to system instability.

[0182] On August 17, after the equipment was installed, the three-phase current tended to balance, the current curves of phases A, B, and C became closer, the current fluctuation amplitude was significantly reduced, the system operation was more stable, and the imbalance was greatly reduced, achieving the expected governance goals. These real field data provide strong empirical support for the technical solution of the end-point power consumption governance device.

[0183] In summary, the synergistic effect of the above steps, through closed-loop control, mutually reinforcing optimization mechanisms, and multi-functional integration, produces unexpected technical benefits such as ultra-fast voltage stabilization, improved overall power quality, increased system efficiency, reduced electrical fire risk, and zero-outage maintenance. These benefits rely on high-precision real-time monitoring, rapid response of dynamic compensation, mutual promotion of harmonic suppression and reactive power regulation, safety assurance of neutral current elimination, and high reliability of automated operation and bypass protection. The underlying principle, through the combination of power electronics technology, control algorithms, and modular design, overcomes the limitations of traditional methods, providing a comprehensive and efficient solution for power quality management in distribution substations.

[0184] Example 3:

[0185] This invention provides a method for managing low voltage in a distribution transformer area based on the principle of intelligent compensation, which is applied to a distribution transformer area with distributed photovoltaic access.

[0186] The transformer in this distribution area has a capacity of 630kVA, and the connected photovoltaic capacity is 200kW. Due to the intermittent nature of photovoltaic power generation and reverse power transmission, the terminal voltage rises to 245V (voltage exceeding the limit) during peak photovoltaic power generation in the daytime, and drops to 200V (low voltage) during peak load at night. Simultaneously, there is a low power factor (approximately 0.90 lag) and 5th and 7th harmonic pollution. This embodiment aims to achieve voltage stability, reactive power balance, and power quality optimization under the dual conditions of photovoltaic reverse power transmission and load fluctuations using the method of this invention.

[0187] Hardware configuration and implementation steps:

[0188] Real-time monitoring is implemented using high-precision sensors and an MCU, with a monitoring response time of less than 5ms. Special attention is paid to the voltage, current, and power factor at the photovoltaic inverter output, as well as the instantaneous rate of change of the bus voltage, to quickly identify voltage rises caused by photovoltaic backfeeding.

[0189] Dynamic voltage compensation (bidirectional regulation): When the bus voltage is below 220V, the power electronic voltage regulator generates a compensation voltage opposite to the voltage deviation and injects it into the system to raise the terminal voltage to 225V.

[0190] When photovoltaic backfeeds high voltage, if the bus voltage exceeds 235V, the power electronic voltage regulator generates a reverse compensation voltage (i.e., absorption voltage) in phase with the voltage deviation to offset the voltage rise caused by photovoltaic backfeeding and stabilize the terminal voltage at 230V. The compensation voltage adjustment range is ±10%.

[0191] Harmonic suppression: The APF continuously monitors and suppresses the 5th and 7th harmonics generated by the photovoltaic inverter, reducing the total harmonic distortion (THD) to below 5%.

[0192] Reactive power regulation dynamically absorbs or injects reactive power through reactive power compensation modules, balancing the reactive power generated by the photovoltaic system and stabilizing the power factor of the distribution area above 0.98.

[0193] Neutral current elimination: Although the three-phase load in the photovoltaic grid area is relatively balanced, fine-tuning is still performed through the load control module to ensure that the neutral current is close to zero and to prevent potential zero-point drift.

[0194] The fully automated operation and bypass protection, along with the intelligent control system employing model predictive control (MPC) algorithms, optimize voltage compensation and reactive power regulation parameters in advance based on photovoltaic power generation forecasts and load changes, achieving smoother voltage control.

[0195] This embodiment effectively solves the dual problems of low and high voltage unique to photovoltaic grid-connected areas through the bidirectional regulation capability of dynamic voltage compensation. By offsetting the voltage rise caused by photovoltaic backfeeding, the duration of voltage exceedance is reduced to below 10 hours / year, and the voltage qualification rate is increased to over 99.9%. At the same time, through reactive power compensation and harmonic suppression, the power quality at the photovoltaic grid connection point is optimized, ensuring the stable operation of the power grid and the maximum power generation efficiency of the photovoltaic system.

[0196] Example 4:

[0197] This invention is applied to a rural power distribution area with a power supply radius of 1.5 km.

[0198] The transformer has a capacity of 315kVA and mainly serves scattered farmers and small agricultural facilities. The main problems in this area are: the voltage at the power supply end is consistently below 190V, the three-phase imbalance is as high as 40% (mainly due to the dispersed single-phase power consumption of farmers), and high line losses (exceeding 5%). This embodiment aims to achieve a significant increase in the end voltage, a balance in the three-phase current, and a substantial reduction in line losses through the method of this invention.

[0199] Hardware configuration and implementation steps:

[0200] Real-time monitoring, with a focus on monitoring the voltage and three-phase current at the end of the line, accurately calculating the line voltage drop (the product of the bus load current and the line impedance) and the three-phase imbalance.

[0201] Dynamic voltage compensation (voltage drop compensation) injects a compensation voltage equal in magnitude but opposite in direction to the line voltage drop through a coupling transformer. The goal is to raise the terminal voltage from below 190V to above 215V, ensuring that the voltage for all users is up to standard.

[0202] Neutral current elimination (three-phase balance regulation), with the load control module as its core function, actively performs three-phase balance regulation by dynamically distributing compensation current to each phase. The goal is to reduce the three-phase imbalance from 40% to below 10%, significantly reducing neutral current and lowering line losses.

[0203] Dynamically adjust reactive current and inject compensating reactive power to improve the power factor to above 0.95. Combined with three-phase balance regulation, control line loss to within 1.5%.

[0204] Harmonic suppression focuses on suppressing the third harmonics generated by agricultural machinery and household appliances commonly found in rural areas.

[0205] The fully automated operation and bypass protection, along with the intelligent control system, dynamically adjusts voltage compensation and three-phase balance regulation strategies based on real-time calculations of line voltage drop and three-phase imbalance, ensuring voltage stability and three-phase balance even during peak load periods.

[0206] This embodiment combines dynamic voltage compensation with neutral current elimination (three-phase balance regulation) to comprehensively address low voltage and three-phase imbalance issues in long-radius power supply areas. The end-point voltage qualification rate has increased from less than 50% to over 99.5%. The reduction in three-phase imbalance and optimization of the power factor have lowered line losses from over 5% to around 1.5%, significantly improving power supply efficiency and economic benefits. Simultaneously, it eliminates the safety hazards caused by excessive neutral current, ensuring the reliable operation of the rural power grid.

[0207] Example 5:

[0208] Based on the same inventive concept as Embodiment 1, this embodiment of the invention discloses a low-voltage management system for distribution transformer substations based on the intelligent compensation principle, applicable to any low-voltage management method for distribution transformer substations based on the intelligent compensation principle in Embodiment 1, comprising:

[0209] The voltage compensation module is used for: dynamic voltage compensation based on the voltage deviation between the bus voltage of the distribution substation and the set voltage when the bus voltage of the distribution substation exceeds the set maximum range; and dynamic voltage compensation based on the line voltage drop of the bus when the bus voltage of the distribution substation exceeds the set minimum range.

[0210] The harmonic suppression module is used to: dynamically suppress harmonics based on the bus load current of the distribution substation;

[0211] The reactive power compensation module is used to perform dynamic reactive power compensation based on the reactive voltage and reactive current of the distribution substation.

[0212] The neutral current elimination module is used to dynamically eliminate neutral current based on the three-phase current of the distribution substation.

[0213] The specific functions of each module described above are explained in the relevant content of the method in Embodiment 1, and will not be repeated here.

[0214] Example 6:

[0215] This embodiment provides a computer-readable storage medium storing computer instructions, which, when executed by a processor, implement the steps of the distribution substation low-voltage management method based on the intelligent compensation principle as described in any of the embodiments.

[0216] Example 7:

[0217] This embodiment provides a computer device, including:

[0218] Memory, used to store computer instructions;

[0219] A processor is configured to execute the computer instructions to implement the steps of the distribution substation low voltage management method based on the intelligent compensation principle as described in any one of Embodiments 1.

[0220] Example 8:

[0221] This embodiment provides a computer program product, including computer instructions, characterized in that, when the computer instructions are executed by a processor, they implement the steps of the distribution substation low voltage management method based on the intelligent compensation principle as described in any one of Embodiment 1.

[0222] Those skilled in the art will understand that embodiments of the present invention can be provided as methods, systems, or computer program products. Therefore, the present invention can take the form of a completely hardware embodiment, a completely software embodiment, or an embodiment combining software and hardware aspects. Furthermore, the present invention can take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code.

[0223] This invention is described with reference to flowchart illustrations and / or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the invention. It will be understood that each block of the flowchart illustrations and / or block diagrams, and combinations of blocks in the flowchart illustrations and / or block diagrams, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, special-purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, generate instructions for implementing the flowchart illustrations and / or block diagrams. Figure 1 One or more processes and / or boxes Figure 1 A device that provides the functions specified in one or more boxes.

[0224] These computer program instructions may also be stored in a computer-readable storage medium that can direct a computer or other programmable data processing device to function in a particular manner, such that the instructions stored in the computer-readable storage medium produce an article of manufacture including instruction means, which are implemented in a process Figure 1 One or more processes and / or boxes Figure 1 The function specified in one or more boxes.

[0225] These computer program instructions may also be loaded onto a computer or other programmable data processing equipment to cause a series of operational steps to be performed on the computer or other programmable equipment to produce a computer-implemented process, thereby providing instructions that execute on the computer or other programmable equipment for implementing the process. Figure 1 One or more processes and / or boxes Figure 1 The steps of the function specified in one or more boxes.

[0226] The embodiments of the present invention have been described above with reference to the accompanying drawings. However, the present invention is not limited to the specific embodiments described above. The specific embodiments described above are merely illustrative and not restrictive. Those skilled in the art can make many other forms under the guidance of the present invention without departing from the spirit and scope of the claims. All of these forms are within the protection scope of the present invention.

Claims

1. A method for managing low voltage in distribution transformer areas based on the principle of intelligent compensation, characterized in that, include: When the bus voltage of the distribution substation exceeds the set maximum range, dynamic voltage compensation is performed based on the voltage deviation between the bus voltage of the distribution substation and the set voltage. When the bus voltage of the distribution area exceeds the set minimum range, dynamic voltage compensation is performed based on the line voltage drop of the bus. Dynamic harmonic suppression is performed based on the bus load current of the distribution station area; Dynamic reactive power compensation is performed based on the reactive voltage and reactive current of the distribution substation. Dynamic neutral current elimination is performed based on the three-phase current of the distribution station area.

2. The method for managing low voltage in distribution substations based on the principle of intelligent compensation according to claim 1, characterized in that, The dynamic voltage compensation based on the voltage deviation between the bus voltage and the set voltage of the distribution substation includes: Real-time calculation of the voltage deviation between the bus voltage and the set voltage of the distribution transformer area; A compensation voltage opposite to the voltage deviation is generated by a power electronic voltage regulator; The compensation voltage is coupled to the power distribution system of the distribution substation using a high-frequency transformer, so that the instantaneous voltage of the busbar is stabilized within a set range; The voltage deviation is obtained by the following formula: ， in, Indicates voltage deviation. Indicates bus voltage. Indicates the set voltage; The compensation voltage is obtained by the following formula: ， in, Indicates the compensation voltage; The instantaneous voltage of the bus is obtained by the following formula: ， in, This represents the instantaneous voltage of the bus.

3. The method for managing low voltage in distribution substations based on the principle of intelligent compensation according to claim 1, characterized in that, The dynamic voltage compensation based on the line voltage drop of the busbar includes: Calculate the line voltage drop of the busbar based on the busbar load current and the line impedance; By injecting a compensation voltage equal in magnitude and opposite in direction to the line voltage drop through a coupling transformer, the bus voltage is increased to over 210 volts. The voltage drop across the line is obtained using the following formula: ， in, This indicates the line voltage drop. Indicates the bus load current. This indicates the line impedance.

4. The method for managing low voltage in distribution substations based on the principle of intelligent compensation according to claim 1, characterized in that, The dynamic harmonic suppression based on the harmonic current of the distribution station area includes: By performing Fourier transform decomposition on the bus load current in the distribution substation, the 3rd, 5th and 7th harmonic currents are obtained. An active filter circuit is used to generate a reverse compensation current that is equal in magnitude but opposite in direction to the 3rd, 5th, and 7th harmonic currents. Injecting the reverse compensation current into the power distribution system of the distribution area increases the harmonic suppression rate to 95% and reduces the total harmonic distortion rate to 5%. The reverse compensation current is obtained by the following formula: ， in, Indicates reverse compensation current. Indicates harmonic current; The harmonic suppression rate is obtained by the following formula: ， in, Indicates the harmonic suppression rate. Represents residual harmonic current; The total harmonic distortion rate is obtained by the following formula: ， in, Indicates the total harmonic distortion rate. This represents the fundamental current.

5. The method for managing low voltage in distribution substations based on the principle of intelligent compensation according to claim 1, characterized in that, The dynamic reactive power compensation based on the reactive voltage and reactive current of the distribution substation includes: Calculate the reactive power based on the reactive voltage and reactive current of the distribution station area; By using the inverter to quickly switch and control the switching of capacitor banks, the reactive current in the distribution transformer area is reduced, the power factor of the distribution transformer area is improved to above 0.95, the total reactive power of the distribution transformer area approaches zero, and the line loss of the distribution transformer area is reduced to within 1.3%. The reactive power is obtained by the following formula: ， in, Indicates reactive power. Indicates the effective value of reactive voltage. This represents the effective value of reactive current. This represents the phase difference angle between reactive voltage and reactive current. The power factor is ; The line loss is obtained using the following formula: ， in, Indicates line loss. This indicates the line resistance.

6. The method for managing low voltage in distribution substations based on the principle of intelligent compensation according to claim 1, characterized in that, The dynamic neutral current elimination based on the three-phase current of the distribution substation includes: The vector sum of the three-phase currents is used as the neutral current. The load control module dynamically generates the three-phase compensation current and distributes it to each phase, so that the compensated neutral current approaches 0 and the three-phase imbalance is reduced to below 30%. The neutral current is obtained by the following formula: ， in, Indicates the neutral current. express Phase current, express Phase current, express Phase current; The compensated neutral current is obtained by the following formula: ， in, This represents the neutral current after compensation. express Phase compensation current, express Phase compensation current, express Phase compensation current. The three-phase unbalance is obtained by the following formula: ， in, Indicates the degree of three-phase imbalance. This represents the function that takes the maximum value. express Phase current, express Phase current, express Phase current, This represents the average value of the three-phase current.

7. A low-voltage management system for distribution transformer areas based on the principle of intelligent compensation, characterized in that, include: The voltage compensation module is used for: dynamic voltage compensation based on the voltage deviation between the bus voltage of the distribution substation and the set voltage when the bus voltage of the distribution substation exceeds the set maximum range; and dynamic voltage compensation based on the line voltage drop of the bus when the bus voltage of the distribution substation exceeds the set minimum range. The harmonic suppression module is used to: dynamically suppress harmonics based on the bus load current of the distribution substation; The reactive power compensation module is used to perform dynamic reactive power compensation based on the reactive voltage and reactive current of the distribution substation. The neutral current elimination module is used to dynamically eliminate neutral current based on the three-phase current of the distribution substation.

8. A computer-readable storage medium storing computer instructions thereon, characterized in that, When the computer instruction is executed by the processor, it implements the steps of the low voltage management method for distribution substations based on the intelligent compensation principle as described in any one of claims 1-6.

9. A computer device, characterized in that, include: Memory, used to store computer instructions; A processor for executing the computer instructions to implement the steps of the low-voltage management method for distribution substations based on the intelligent compensation principle as described in any one of claims 1-6.

10. A computer program product comprising computer instructions, characterized in that, When the computer instruction is executed by the processor, it implements the steps of the low voltage management method for distribution substations based on the intelligent compensation principle as described in any one of claims 1-6.

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