Low-voltage three-phase metering balancing method and system

Abstract

The invention discloses a low-voltage three-phase metering balancing method and system, and relates to the technical field of power systems, and the method comprises the following steps: collecting current and voltage signals of a low-voltage three-phase power system in real time; calculating power, power factor and load current electrical parameters of each phase; calculating the power difference of each phase, and judging the balance condition of each phase; if it is found that power imbalance exists between the phases, a balance adjustment process is entered; adjusting load distribution or voltage compensation to enable the three-phase system to reach a balanced state; and if the balance adjustment succeeds, the normal monitoring mode is recovered. By adjusting load distribution and voltage compensation, it is ensured that the system is always kept in a balanced state, the use efficiency of electric power resources is optimized, the equipment fault risk is reduced, manual intervention and maintenance cost are reduced, the stability, reliability and energy efficiency of the electric power system are improved, and the method is suitable for popularization and application. And a more intelligent and efficient solution is provided for power management.

Description

Technical Field

[0001] This invention relates to the field of power system technology, and in particular to a low-voltage three-phase metering balancing method and system. Background Technology

[0002] Low-voltage three-phase power systems are widely used in industrial, commercial, and residential buildings for power supply. As a fundamental component of modern power networks, they undertake large-scale power transmission and distribution tasks. In these systems, variations in power load, the nonlinear characteristics of equipment operation, and external environmental disturbances can all lead to power imbalances. In particular, the variability in industrial and commercial loads and the differences in power demand among different devices can cause uneven distribution of three-phase current and voltage, resulting in power imbalance. This imbalance not only affects power transmission efficiency but can also lead to unstable equipment operation, reduced energy efficiency, and even equipment failure or damage due to overload, overvoltage, or undervoltage.

[0003] With the continuous expansion and increasing complexity of power systems, traditional power monitoring methods can no longer meet the needs of efficient management in modern power systems. Traditional methods often rely on manual inspections or load balancing based on fixed algorithms, lacking real-time performance and automated processing capabilities. This approach is not only inefficient but also susceptible to human error, leading to slow detection and response times for power system faults, and even failing to identify potential problems in a timely manner. Especially in large-scale industrial parks or commercial buildings, load imbalances may be overlooked, further exacerbating system instability. Therefore, we propose a low-voltage three-phase metering balancing method and its system. Summary of the Invention

[0004] The purpose of this invention is to provide a low-pressure three-phase metering balancing method and system to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a low-voltage three-phase metering balancing method, comprising the following steps:

[0006] Step 1: Real-time acquisition of current and voltage signals from the low-voltage three-phase power system;

[0007] Step 2: Based on the collected current and voltage signals, calculate the power, power factor, and load current electrical parameters of each phase;

[0008] Step 3: Calculate the power difference of each phase based on the electrical parameters, and determine the balance of each phase based on the power difference;

[0009] Step 4: If a power imbalance is found between phases, the balance adjustment process will be initiated and the corresponding alarm will be triggered.

[0010] Step 5: In the balance adjustment process, adjust the load distribution or voltage compensation to bring the three-phase system to a balanced state.

[0011] Step 6: If the balance adjustment is successful, restore the normal monitoring mode and continue to monitor the system status.

[0012] Preferably, step 3 includes the following specific steps:

[0013] Step 3.1: Calculate the power factor of each phase and determine whether the power is effective based on the power factor;

[0014] Step 3.2: Set multiple thresholds based on power differences for judgment. If the power difference exceeds the preset threshold, the system is considered unbalanced.

[0015] Step 3.3: Further analyze the load current. If the difference in load current exceeds the set value, it is determined that the load is unbalanced.

[0016] Preferably, the formula for calculating the power factor in step 3.1 is:

[0017]

[0018] The active power is the actual power of each phase, and the apparent power is the product of the voltage and current of each phase.

[0019] Preferably, the power difference calculation formula in step 3.2 is as follows:

[0020] ΔP=P phase1 -P phase2 =|P phase1 -P phase3 |;

[0021] Where ΔP is the power difference, P phase1 P phase2 and P phase3 These represent the active power of each phase.

[0022] Preferably, the data analysis in step 3 further includes:

[0023] Discrete Fourier transform is performed on the voltage and current waveforms of each phase to extract the main frequency components and harmonic components of each phase.

[0024] The total harmonic distortion (THD) is calculated based on the dominant frequency component and harmonic components to determine power quality. The calculation formula is as follows:

[0025]

[0026] Where V1 is the fundamental amplitude, V n Let N be the amplitude of the nth harmonic, and N be the total number of harmonics.

[0027] Preferably, if the THD value is greater than a set threshold of 10%, the power quality anomaly process is initiated:

[0028] Record the changes in voltage distortion and harmonic amplitude to determine whether they are caused by a nonlinear load.

[0029] If the anomaly persists for more than 3 seconds after the set time, an anomaly report will be sent to the dispatch center and a power quality alarm will be triggered.

[0030] Preferably, the balance adjustment process in step 5 includes:

[0031] Step 5.1: Based on the differences in power and load current, make initial adjustments by regulating the voltage or load distribution;

[0032] Step 5.2: Perform appropriate voltage compensation to control the voltage fluctuation of each phase within ±5%;

[0033] Step 5.3: Adjust the load to balance the load of each phase and ensure that the load difference is less than 10%.

[0034] Preferably, the voltage compensation calculation formula in step 5.2 is as follows:

[0035]

[0036] Among them, V adjust The adjusted voltage, V phase The voltage of the current phase is given by P, where ΔP is the active power. total This represents the total power of the system.

[0037] Preferably, the monitoring mode in step 6 includes:

[0038] Step 6.1: Continuously monitor the current, voltage, and power parameters of each phase. If abnormal fluctuations are detected, immediately enter alarm mode.

[0039] Step 6.2: After the equipment returns to normal, restore it to the regular monitoring mode and record the adjustment process and results.

[0040] The present invention also provides a low-pressure three-phase metering balancing system, implementing the low-pressure three-phase metering balancing method described in any of the above claims, comprising:

[0041] A current acquisition module, which is used to acquire the current signal of each phase in real time;

[0042] A voltage acquisition module, which is used to acquire the voltage signals of each phase in real time;

[0043] The data analysis module is used to calculate power, power factor and load current, and to determine whether there is an imbalance.

[0044] A balance adjustment module is used to adjust the voltage and load according to the power and current differences to achieve three-phase balance.

[0045] An alarm module is used to trigger an alarm signal when an imbalance is detected in the system.

[0046] Compared with the prior art, the technical effects of the present invention are as follows:

[0047] The low-voltage three-phase metering balancing method provided by this invention can automatically monitor various parameters of the power system in real time, promptly detect power imbalances and make automatic adjustments. By adjusting load distribution and voltage compensation, it ensures that the system always maintains a balanced state, optimizes the efficiency of power resource utilization, reduces the risk of equipment failure, and reduces manual intervention and maintenance costs. This method improves the stability, reliability and energy efficiency of the power system, and provides a more intelligent and efficient solution for power management. Attached Figure Description

[0048] Figure 1 This is a schematic diagram of the method flow of the present invention. Detailed Implementation

[0049] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0050] This invention provides, for example Figure 1 The low-pressure three-phase metering balancing method shown includes the following steps:

[0051] Step 1: Real-time acquisition of current and voltage signals from the low-voltage three-phase power system. This provides the foundational data for all subsequent calculations and analyses. By acquiring current and voltage signals in real time, the system can obtain the real-time operating status of the power system, laying the foundation for the accuracy and real-time performance of the monitoring system. Real-time acquisition of current and voltage signals enables the system to detect any fluctuations or anomalies in the power system at the first moment, ensuring the system's immediate monitoring of power load and power quality. By monitoring changes in current and voltage, the system can promptly capture fault characteristics in the power system, such as voltage imbalance and sudden current changes, thereby providing data support for subsequent fault location, diagnosis, and early warning, ensuring the integrity and accuracy of the data. By acquiring multiple electrical parameters, including current and voltage, the system can comprehensively reflect the load and performance status of the power system.

[0052] Step 2: Based on the collected current and voltage signals, calculate the power, power factor, and load current electrical parameters of each phase. By calculating these parameters, the system can quantify the power load and performance of each phase. These calculations provide a quantitative basis for subsequent analysis, judgment, and adjustment. Calculating power and power factor helps assess the operating efficiency and power quality of the power system. For example, a power factor lower than the set standard may indicate power loss or load imbalance, thus affecting power supply efficiency and stability. By calculating the load current of each phase, it can be determined whether there is a load imbalance in the three-phase system. If a certain phase... If the load current is significantly high or low, the system can trigger a balancing adjustment process to optimize the power system's operating state. Power factor calculation can also help detect power factor imbalance or power quality problems in the power system. Low power factor is usually accompanied by high reactive power, which may lead to reduced power transmission efficiency and increased equipment losses. Therefore, accurate power factor calculation is crucial for monitoring power quality. The calculation and analysis of current and voltage signals can help detect potential faults in the power system. For example, by calculating power differences, power factor, and load current, the system can determine whether there are risks of overload, overvoltage, undervoltage, etc., thereby locating and alarming the fault.

[0053] Step 3: Calculate the power difference of each phase based on the electrical parameters, and determine the balance of each phase based on the power difference;

[0054] Step 3 includes the following specific steps:

[0055] Step 3.1: Calculate the power factor for each phase and determine whether the power is effective based on the power factor. The formula for calculating the power factor in Step 3.1 is:

[0056]

[0057] The active power is the actual power of each phase, and the apparent power is the product of the voltage and current of each phase.

[0058] The calculation of power factor can effectively determine whether the power transmission of the power system is effective. If the power factor is low, it means that there is a lot of reactive power, which leads to low power efficiency. By calculating the power factor, the system can understand in real time whether the power transmission meets the standard and optimize when the power factor is low. By judging the effectiveness of the power factor, energy efficiency problems in the system can be detected in time. A low power factor may lead to energy waste and increased equipment load, thereby affecting the long-term stable operation of the system. If the power factor is normal, it means that the active power of the phase is effective and the power transmission can proceed normally. Otherwise, it indicates that reactive power needs to be compensated or adjusted.

[0059] Step 3.2: Multiple thresholds are set based on power differences for judgment. If the power difference exceeds a preset threshold, the system is considered unbalanced. The power difference calculation formula in Step 3.2 is:

[0060] ΔP=P phase1 -P phase2 =|P phase1 -P phase3 |;

[0061] Where ΔP is the power difference, P phase1 P phase2 and P phase3 These represent the active power of each phase.

[0062] By calculating the power difference of each phase, the system can determine whether there is a load imbalance in the three-phase power system. If the power difference exceeds a threshold, the system can determine that the current state is unbalanced and activate corresponding adjustment or alarm mechanisms. Multiple thresholds are set for judgment to ensure that the system can respond appropriately to different levels of power difference. In this way, the system can adaptively adjust the thresholds according to the actual operating conditions, improving the accuracy and flexibility of the judgment. When the power difference exceeds the set threshold, the system can issue a timely warning to prevent equipment damage, power loss, and efficiency reduction caused by imbalance. This effectively avoids potential equipment overload or grid failure.

[0063] Step 3.3: Further analyze the load current. If the load current difference exceeds the set value, it is determined to be a load imbalance. The system further confirms the load balance by calculating the current difference. If the load current difference exceeds the set threshold, the system will determine that the load is unbalanced. This analysis can accurately identify load unevenness problems, thereby improving the system's detection capability. After determining load imbalance, the system can adjust the load distribution or perform voltage compensation based on the analysis results to ensure three-phase load balance, improve system efficiency and stability. Load imbalance may cause some equipment to overload or malfunction. By identifying and adjusting the load distribution in advance, the system can reduce damage to equipment, extend equipment life, and reduce the failure rate.

[0064] The data analysis in step 3 also includes:

[0065] Discrete Fourier Transform (DFT) processing is performed on the voltage and current waveforms of each phase to extract the dominant frequency components and harmonic components of each phase. DFT processing can extract the spectral information of voltage and current waveforms and identify harmonic components in the signal, thereby providing in-depth analysis of power quality. This helps to determine whether there are problems such as harmonic pollution and voltage fluctuations in the power system. By analyzing the dominant frequency and harmonic components, the system can detect and identify the sources of harmonics in the power grid, such as nonlinear loads and abnormal operation of electrical equipment, and then take effective measures to reduce the interference of harmonics on the system. Spectrum analysis provides detailed frequency domain data of the power system's operating status, helping the system to better evaluate and optimize power quality, and providing a basis for further power adjustment and load balancing.

[0066] The total harmonic distortion (THD) is calculated based on the dominant frequency component and harmonic components to determine power quality. The calculation formula is as follows:

[0067]

[0068] Where V1 is the fundamental amplitude, V n Let N be the amplitude of the nth harmonic, and N be the total number of harmonics.

[0069] If the THD value exceeds a set threshold of 10%, the power quality anomaly process will be initiated.

[0070] Record the changes in voltage distortion and harmonic amplitude to determine whether they are caused by a nonlinear load.

[0071] When the THD value exceeds the threshold of 10%, the system can automatically determine that the power quality is abnormal and trigger the emergency response mechanism. This includes recording and analyzing the power quality problem and reporting it to the dispatch center in a timely manner to ensure that the problem can be handled in a timely manner and prevent it from affecting the operation of a wider range of systems. The system automatically starts the power quality abnormality handling process, which can adjust the grid operating parameters in real time, switch loads or activate harmonic filtering devices, and at the same time trigger the alarm mechanism to send an alert to the operation and maintenance personnel so that they can handle it quickly.

[0072] If the anomaly persists for more than 3 seconds after the set time, an anomaly report will be sent to the dispatch center and a power quality alarm will be triggered.

[0073] Setting a 3-second duration threshold allows the system to immediately assess and respond to anomalies. If the power quality anomaly persists beyond the set time, the system will quickly relay the anomaly information to the dispatch center, providing real-time fault information to maintenance personnel and ensuring rapid response. This process ensures that the system can automatically report faults and issue alarms when power quality problems occur, minimizing human intervention delays and optimizing emergency response time.

[0074] Step 4: If a power imbalance is detected between phases, the system initiates a balancing adjustment process and triggers the corresponding alarm. By automatically detecting power imbalances in the three-phase power system, the adjustment process can be initiated immediately. The system can autonomously identify imbalances and initiate subsequent balancing operations without manual intervention. This reduces human error and improves the system's automation and intelligence. Through automated response, the system can effectively shorten fault response time, adjust promptly, and ensure stable system operation. The balancing adjustment process helps balance the load of each phase by redistributing the power load or adjusting the voltage. This effectively reduces the additional energy consumption and equipment burden caused by power imbalances. By adjusting the load and balancing the voltage, the load of each phase can be balanced, avoiding overload or underload in any phase, ensuring the operating efficiency and stability of the power system. Long-term power imbalances may lead to overload or damage to electrical equipment (such as transformers and motors). By promptly initiating the balancing adjustment process, the equipment can operate under normal load, thereby reducing overload risk, failure rate, and energy consumption. The equipment will not be in an overload or underload state for a long time, significantly improving equipment reliability. The system improves reliability, reduces maintenance and repair costs, and extends equipment lifespan. When a power imbalance is detected, the system automatically triggers an alarm to notify relevant operators or management systems. This alarm mechanism ensures real-time performance, enabling timely further compensation or repair measures. The timely triggering of the alarm ensures that operators can react quickly to abnormal situations in the power system and take measures to repair or optimize, reducing potential losses caused by imbalance. Power imbalance may lead to power quality problems such as voltage fluctuations and frequency instability in the power system. By initiating a balancing process when imbalance occurs, the system's power quality can be maintained, preventing power fluctuations from adversely affecting equipment and loads, maintaining good power quality, improving equipment operating efficiency, reducing power losses, ensuring the stable operation of the power system, and avoiding large-scale system failures or outages.

[0075] Step 5: In the balance adjustment process, adjust the load distribution or voltage compensation to bring the three-phase system to a balanced state.

[0076] The balancing process in step 5 includes:

[0077] Step 5.1: Based on the differences in power and load current, make initial adjustments by regulating voltage or load distribution. By adjusting voltage or load distribution, the system can quickly make initial adjustments based on the differences in power and load current. The purpose of this step is to rapidly reduce the power imbalance between the three phases through simple adjustment methods, preparing for subsequent more refined adjustments. This allows the system to restore basic balance in the shortest possible time, reducing overload or equipment damage caused by power differences. Adjusting power distribution or voltage based on load current differences can achieve optimal allocation of system resources, ensuring that the load of each phase is close to balanced, thereby avoiding overload and underload states of any phase. This avoids the burden of unbalanced loads on the power system, helping to improve the efficiency and stability of the power system. The initial adjustment reduces power differences, avoiding additional energy waste caused by power imbalance. Through the initial adjustment of power and load differences, the system can utilize power resources more efficiently, reduce ineffective energy consumption, and improve power utilization efficiency.

[0078] Step 5.2: Perform appropriate voltage compensation to control voltage fluctuations in each phase within ±5%. Appropriate voltage compensation ensures that voltage fluctuations in the three-phase system are controlled within a small range, typically ±5%. This ensures stable operation of electrical equipment within a reasonable voltage range, preventing damage or efficiency reduction caused by excessively high or low voltage. Through voltage compensation, equipment in the system can operate stably, reducing losses caused by voltage fluctuations and preventing premature aging or failure of electrical equipment due to voltage instability. Voltage compensation helps prevent equipment from malfunctioning due to excessively low voltage in one phase or from being damaged by excessively high voltage. By ensuring the stability of voltage in each phase, overload and equipment damage in the power system can be avoided. Maintaining voltage stability prevents equipment overload or failures caused by voltage instability, ensuring the reliability of power supply and the long lifespan of electrical equipment. Voltage compensation helps improve power quality, reducing voltage fluctuations and frequent outages or failures caused by voltage instability, thereby improving the overall operational quality of the power system. Improved power quality contributes to the efficient operation of the entire power network, enhances the user's electricity experience, and reduces unnecessary power outages and maintenance.

[0079] Step 5.3: Adjust the load to balance the load of each phase and ensure that the load difference is less than 10%.

[0080] The formula for calculating voltage compensation in step 5.2 is as follows:

[0081]

[0082] Among them, V adjust The adjusted voltage, V phase The voltage of the current phase is given by P, where ΔP is the active power. totalThe total power of the system is measured by adjusting the load to achieve a balance between phases. This means that the load on each phase remains consistent within a reasonable range, preventing any one phase from being overloaded or underloaded, thus avoiding imbalance. Reasonable load adjustment prevents equipment overload caused by excessive load on a single phase and also avoids waste caused by an underloaded phase. This effectively improves the stability and resource utilization efficiency of the power system. Load imbalance often leads to overload operation of certain equipment, resulting in malfunctions or damage. By reasonably adjusting the load difference, the system can prevent overload risks and potential equipment failures while ensuring load balance on each phase. This reduces failure events caused by load imbalance, extends equipment lifespan, and ensures long-term stable system operation. Ensuring load balance reduces power waste and improves overall system efficiency. A load difference of less than 10% helps ensure that every part of the power system operates at its optimal state, ensuring efficient use of electrical energy, efficient system operation, improved energy utilization, and reduced energy and system operating costs.

[0083] Step 6: If the balance adjustment is successful, restore the normal monitoring mode and continue to monitor the system status.

[0084] The monitoring modes in step 6 include:

[0085] Step 6.1: Continuously monitor the current, voltage, and power parameters of each phase. If abnormal fluctuations are detected, immediately enter alarm mode. This ensures that after the power system returns to a balanced state, key electrical parameters such as current, voltage, and power of each phase are continuously monitored. Through real-time monitoring, the system can detect any fluctuations or anomalies in the power system, maintaining efficient real-time monitoring of the system status. It can promptly detect abnormal fluctuations in voltage, current, or power, ensuring the stability of the system after recovery. If any abnormal fluctuations in current, voltage, or power are detected during monitoring, the system can immediately enter alarm mode to notify operators in advance. This early warning mechanism helps to take action before the problem worsens. Necessary remedial measures, through early detection and alarm, can effectively reduce fault losses and system downtime, improve the reliability and stability of the power system. When abnormal fluctuations are detected, the system automatically triggers alarms and reacts quickly without relying on manual intervention. This automated response reduces human judgment and reaction delays, improves the overall response speed of the system, and ensures that the system can respond and handle power fluctuations in their early stages, avoiding serious consequences caused by delayed response. Continuous monitoring and timely alarms can ensure that the power system is always in a healthy and stable operating state, avoiding adverse effects on load equipment due to power quality problems (such as voltage fluctuations, power imbalances, etc.).

[0086] Step 6.2: After the equipment returns to normal, revert to the regular monitoring mode and record the adjustment process and results. Once the equipment has been balanced and returned to normal, the system will automatically switch back to the regular monitoring mode. This means that the system has resumed normal operation and continues to monitor key parameters such as current, voltage and power routinely. Reverting to the regular monitoring mode ensures continuous monitoring of the equipment under normal working conditions, allowing any potential problems to be detected at any time and maintaining the health of the power system.

[0087] The present invention also provides a low-pressure three-phase metering balancing system, and a low-pressure three-phase metering balancing method implementing any of the above claims, comprising:

[0088] Current acquisition module, used to acquire current signals of each phase in real time;

[0089] Voltage acquisition module, used to acquire phase voltage signals in real time;

[0090] The data analysis module is used to calculate power, power factor, and load current, and to determine whether there is an imbalance.

[0091] The balance adjustment module is used to adjust the voltage and load according to the power and current differences to achieve three-phase balance.

[0092] The alarm module is used to trigger an alarm signal when an imbalance is detected in the system.

[0093] Finally, it should be noted that the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A low voltage three-phase metering balancing method, characterized by, The method comprises the following steps: Step 1, real-time acquisition of current and voltage signals of a low-voltage three-phase power system; Step 2, calculation of power, power factor and load current electrical parameters of each phase according to the acquired current and voltage signals; Step 3, calculation of power difference of each phase according to the electrical parameters, and determination of the balance of each phase according to the power difference; Step 4, if power imbalance is found between phases, enter the balance adjustment process and trigger the corresponding alarm; Step 5, in the balance adjustment process, adjust the load distribution or voltage compensation to make the three-phase system reach a balanced state; Step 6, if the balance adjustment is successful, return to the normal monitoring mode and continuously monitor the system state.

2. A low voltage three-phase metering balancing method according to claim 1, characterized in that, The specific steps of step 3 include: Step 3.1, calculation of the power factor of each phase, and determination of whether the power is valid according to the power factor; Step 3.2, determination according to multiple threshold values set according to the power difference, if the power difference exceeds the preset threshold value, it is considered that the system is unbalanced; Step 3.3, further analysis of the load current, if the load current difference exceeds the set value, it is determined that the load is unbalanced.

3. A low voltage three-phase metering balancing method according to claim 2, characterized in that, The calculation formula of the power factor in step 3.1 is: Where the active power is the actual power of each item, and the apparent power is the product of the voltage and current of each phase.

4. A low voltage three-phase metering balancing method according to claim 2, characterized in that, The calculation formula of the power difference in step 3.2 is: ΔP = P phase1 - P phase2 = |P phase1 - P phase3 |; wherein ΔP is the power difference, P phase1 , P phase2 , and P phase3 are the active power of each phase, respectively.

5. A low voltage three-phase metering balancing method according to claim 4, characterized in that, The data analysis in step 3 also includes: Discrete Fourier transform processing of the voltage and current waveforms of each phase to extract the main frequency component and harmonic component of each phase; According to the main frequency component and harmonic component, the total harmonic distortion rate THD is calculated to judge the power quality, and the calculation formula is as follows: where V1 is the fundamental amplitude, V n is the amplitude of the nth harmonic, and N is the total number of harmonics.

6. A low voltage three-phase metering balancing method according to claim 5, characterized in that, If the THD value is greater than the set threshold value of 10%, enter the power quality abnormality process: Record the voltage distortion and harmonic amplitude change, and judge whether it is caused by nonlinear load; After the abnormality lasts for more than 3 seconds, send an abnormality report to the dispatch center and trigger the power quality alarm.

7. A low voltage three-phase metering balancing method according to claim 6, characterized in that, The balance adjustment process of step 5 includes: Step 5.1, preliminary adjustment by adjusting the voltage or load distribution according to the difference of power and load current; Step 5.2, appropriately compensate the voltage to control the voltage fluctuation of each phase within ±5%; Step 5.3, adjust the load to balance the load of each phase, and ensure that the load difference is less than 10%.

8. A low voltage three-phase metering balancing method according to claim 7, characterized in that, The calculation formula of the voltage compensation in step 5.2 is: where V adjust is the adjusted voltage, V phase is the voltage of the current phase, ΔP is the active power, P total is the total power of the system.

9. A low voltage three-phase metering balancing method according to claim 8, characterized in that, The monitoring mode of step 6 includes: Step 6.1, continuously monitor the current, voltage and power parameters of each phase, and immediately enter the alarm mode if abnormal fluctuations are found; Step 6.2, after the device returns to normal, return to the normal monitoring mode, and record the adjustment process and results.

10. A low voltage three-phase metering and balancing system implementing a low voltage three-phase metering and balancing method according to any one of claims 1 to 9, characterized by It comprises: A current acquisition module for real-time acquisition of current signals of each phase; A voltage acquisition module for real-time acquisition of voltage signals of each phase; A data analysis module for calculating power, power factor and load current, and determining whether there is imbalance; A balance adjustment module for adjusting voltage and load according to the difference of power and current to achieve three-phase balance; an alarm module for triggering an alarm signal when a system imbalance is found. an alarm module for triggering an alarm signal when a system imbalance is found.

Images