Bypass control method for power distribution power-saving system

Abstract

The invention relates to the field of bypass control of a power distribution system, and particularly discloses a bypass control method for a power distribution power-saving system, which comprises the following steps of: setting an upper limit value and a lower limit value of load power corresponding to a switching bypass according to rated capacity, environment temperature and historical load data of a main power supply line, and improving the reasonability of limit value setting; whether the bypass trigger condition is met or not is judged according to the operation state of the main power supply line, and whether the load meets the bypass trigger condition or not is judged according to the dynamic load power, so that bypass use can be dynamically adjusted according to the load condition to achieve the power saving effect; reliable switching of the power distribution system can be ensured when a main power supply line fails, and power failure is avoided; according to the evaluation indexes of the capacity and load matching degree, the electrical parameter stability, the path efficiency and the switching performance, the optimal bypass power supply path is screened, the selectable bypass can be evaluated and optimized when the bypass is switched, and the energy-saving potential of the power distribution power-saving system can be brought into full play.

Description

Technical Field

[0001] The invention relates to the field of bypass control of a power distribution system, and in particular to a bypass control method for a power distribution and electricity saving system. Background Art

[0002] With the rapid development of social economy, the demand for electric power resources continues to grow, and the stability and efficiency of power supply have become the focus of attention. In the field of power distribution, the application of power distribution and energy saving systems is of vital importance to improving the efficiency of electric energy utilization, reducing energy consumption and ensuring the stable operation of the power system.

[0003] In the existing power distribution and energy-saving system, bypass control, as a key technology, directly affects the overall performance and reliability of the system.

[0004] However, the existing power distribution and energy saving systems still have some limitations and shortcomings in practical applications.

[0005] For example, the existing Chinese patent with authorization announcement number CN103904773B discloses a bypass device of a power distribution device and a control method of a power distribution network, the device comprising: a detection device, used to connect to the output end of the power distribution device and detect whether the output end voltage is less than or equal to a preset threshold value, wherein the output end voltage represents the voltage value output by the output end; a first switch device, used to connect between the input end and the output end of the power distribution device; wherein the first switch device is associated with the detection device, and is used to electrically connect the input end with the output end when the detection device detects that the output end voltage is less than or equal to the preset threshold value. This invention solves the technical problem that when a UPS fails, the power distribution network is likely to interrupt the power supply to the load for a long time.

[0006] For example, an existing Chinese patent with publication number CN105978137A discloses a distribution bypass emergency power supply system, including AC power, an emergency generator, a detection unit, an automatic conversion device and a control unit; the two input ends of the automatic conversion device are respectively connected to the AC power and the emergency generator, the output end of the automatic conversion device is connected to the electrical equipment, the detection unit is used to monitor the power supply status of the AC power and send it to the control unit, the control unit controls the action of the automatic conversion device, and the control unit is electrically connected to the emergency generator; it also includes a first auxiliary switch and a second auxiliary switch, the first auxiliary switch is arranged between the AC power and the electrical equipment, and is connected in parallel with the automatic conversion device, the second auxiliary switch is arranged between the emergency generator and the electrical equipment, and is connected in parallel with the automatic conversion device, and the first auxiliary switch and the second auxiliary switch are both electrically connected to the control unit; the distribution bypass emergency power supply system realizes emergency power supply and avoids sparking and arcing when the automatic conversion device is switched, and has high safety.

[0007] The above patent has the following shortcomings: 1. The bypass control strategy with a fixed threshold cannot adapt to dynamic load changes and is prone to frequent false operations or energy waste.

[0008] 2. The control strategy is relatively simple, and there is a lack of evaluation and selection of various optional bypasses when switching bypasses, which makes it difficult to fully tap the energy-saving potential of the power distribution and power saving system. Summary of the invention

[0009] In response to the above problems, the present invention proposes a bypass control method for a power distribution and energy-saving system. The specific technical solution is as follows: A bypass control method for a power distribution and energy-saving system, comprising the following steps: Step 1, according to the rated capacity, ambient temperature and historical load data of the main power supply line in the distribution system, set the upper and lower limit values ​​of the load power corresponding to the switching bypass of the distribution system.

[0010] Step 2: Use multi-source heterogeneous sensors to collect electrical parameters of the main power supply line in real time to determine whether the main power supply line is operating abnormally and whether the main power supply line meets the bypass triggering conditions.

[0011] Step 3: Monitor the dynamic load power of the main power supply line in real time to determine whether the load meets the bypass triggering condition.

[0012] Step 4: If the main power supply line or the load meets the bypass triggering condition, a plurality of bypass power supply paths are generated according to the preset bypass control rules.

[0013] Step 5: Select the optimal bypass power supply path based on the evaluation indicators of capacity and load matching, electrical parameter stability, path efficiency, and switching performance.

[0014] Step 6: Switch to the optimal bypass power supply path through the intelligent switch array until the main power supply line returns to normal or meets the exit condition.

[0015] Based on the above embodiment, the specific analysis process of step 1 includes: extracting the rated capacity of the main power supply line in the power distribution system stored in the database, and obtaining the upper limit value and lower limit value of the load power of the main power supply line according to the preset upper limit value and lower limit value of the ratio between the load power of the main power supply line and the rated capacity of the main power supply line, and recording them as .

[0016] According to the set principle, the detection range of the main power supply line in the power distribution system is delineated, and the highest temperature within the detection range of the main power supply line is measured in real time by the temperature sensor, which is recorded as the ambient temperature of the main power supply line, and recorded as .

[0017] Set the upper limit of the load power of the main power supply line and the ambient temperature of the main power supply line Substitute into the calculation formula Analyze the reference upper limit value of the load power of the main power supply line , Indicates the preset warning value of the main power supply line ambient temperature. Indicates the overshoot of the ambient temperature of the main power supply line exceeding its warning value. Indicates the correction value of the load power limit of the main power supply line corresponding to the unit overshoot of the preset main power supply line ambient temperature exceeding its warning value. , .

[0018] Referring to the analysis method of the reference upper limit value of the load power of the main power supply line, the reference lower limit value of the load power of the main power supply line is analyzed and recorded as .

[0019] On the basis of the above embodiment, the specific analysis process of step 1 further includes: extracting the historical load data of the main power supply line in the power distribution system stored in the database, obtaining the peak value, peak duration, valley value, and valley duration of the historical load power of the main power supply line, and recording the peak value and valley value of the historical load power of the main power supply line as .

[0020] Set the reference upper limit of the load power of the main power supply line to and the peak value of the historical load power of the main power supply line Substitute into the calculation formula Analyze the load power upper limit corresponding to the bypass switching of the distribution system ,in They represent the weights of the preset reference upper limit of the load power of the main power supply line and the historical peak value of the load power of the main power supply line, respectively. , .

[0021] Referring to the analysis method of the upper limit of the load power corresponding to the bypass switching of the distribution system, the lower limit of the load power corresponding to the bypass switching of the distribution system is analyzed and recorded as .

[0022] Based on the above embodiment, the specific analysis process of step 2 includes: collecting electrical parameters of the main power supply line in real time through multi-source heterogeneous sensors, where the electrical parameters include voltage, current and power factor, which are respectively recorded as .

[0023] Extract the expected values ​​of the electrical parameters of the main power supply line stored in the database to obtain the expected values ​​of the voltage, current and power factor of the main power supply line, which are recorded as .

[0024] Substitute the voltage, current, power factor and their corresponding expected values ​​of the main power supply line into the calculation formula Analyze the operating status evaluation coefficient of the main power supply line ,in represents a natural constant, The threshold values ​​respectively represent the fluctuation amounts of the voltage and current of the preset main power supply line.

[0025] Based on the above embodiment, the specific analysis process of step two also includes: comparing the operating status evaluation coefficient of the main power supply line with a preset operating status evaluation coefficient threshold; if the operating status evaluation coefficient of the main power supply line is less than the preset operating status evaluation coefficient threshold, the main power supply line operates abnormally; otherwise, the main power supply line operates normally.

[0026] Based on the above embodiment, the specific analysis process of step five includes: extracting the rated capacity of each bypass power supply path from the database, and monitoring the current load of each bypass power supply path in real time to obtain the remaining capacity of each bypass power supply path.

[0027] The difference between the rated capacity of each bypass power supply path and the rated capacity of the main power supply line is called the relative deviation of the rated capacity of each bypass power supply path.

[0028] The remaining capacity of each bypass power supply path is compared with the dynamic load power of the main power supply line, and the difference between the two is calculated, which is defined as the relative deviation of the remaining capacity of each bypass power supply path.

[0029] The comparison table of the relationship between the relative deviation of the rated capacity and the relative deviation of the remaining capacity of the bypass power supply path and the capacity and load matching degree of the bypass power supply path when the main power supply line operates abnormally, the dynamic load power exceeds the upper limit, and the dynamic load power is below the lower limit stored in the database is consulted, and the capacity and load matching degree of each bypass power supply path is determined based on the two relative deviation values ​​calculated previously.

[0030] Based on the above embodiment, the specific analysis process of step five also includes: extracting the historical operation data of each bypass power supply path stored in the database, obtaining the historical voltage fluctuation range and historical harmonic content of each bypass power supply path, and matching the electrical parameter stability coefficient of each bypass power supply path based on the relationship comparison table between the historical voltage fluctuation range, historical harmonic content and electrical parameter stability coefficient of the bypass power supply path stored in the database.

[0031] The line impedance and topological distance of each bypass power supply path are obtained, and the relationship comparison table between the line impedance, topological distance and path efficiency of the bypass power supply path stored in the database is extracted to match the path efficiency of each bypass power supply path.

[0032] According to the historical operation data of each bypass power supply path, the switching time and switching success rate of each bypass power supply path are obtained, and the relationship comparison table between the switching time and switching success rate of the bypass power supply path and the switching performance coefficient of the bypass power supply path stored in the database is extracted to match the switching performance coefficient of each bypass power supply path.

[0033] Compared with the prior art, the bypass control method for a power distribution and power saving system described in the present invention has the following beneficial effects: 1. The present invention sets the upper and lower limit values ​​of the load power corresponding to the switching bypass according to the rated capacity, ambient temperature and historical load data of the main power supply line, thereby improving the rationality of the load power limit setting, and combines the dynamic load power of the main power supply line to determine whether the load meets the bypass trigger condition. The bypass control method with an adaptive threshold is adopted, which can better adapt to dynamic load changes and reduce frequent false operations and energy waste.

[0034] 2. The present invention monitors the operating status and dynamic load conditions of the main power supply line and determines whether the main power supply line and the load meet the bypass triggering conditions. It can not only dynamically adjust the use of the bypass according to the load conditions to achieve power saving effects, but also ensure that the distribution system can reliably switch and avoid power outages when the main power supply line fails.

[0035] 3. The present invention evaluates each bypass power supply path from the dimensions of capacity and load matching, electrical parameter stability, path efficiency, switching performance, etc., and then selects the optimal bypass power supply path. It can evaluate and select each optional bypass when switching the bypass, which is conducive to giving full play to the energy-saving potential of the power distribution and power saving system. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings required for describing the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without paying creative work.

[0037] Figure 1 It is a schematic diagram of the method flow of the present invention.

[0038] Figure 2 This is an analysis flow chart of step one of the present invention.

[0039] Figure 3 This is the bypass trigger judgment logic diagram of the present invention. DETAILED DESCRIPTION

[0040] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0041] See also Figure 1 and Figure 3 As shown, the present invention provides a bypass control method for a power distribution and power saving system, comprising the following steps: Step 1, according to the rated capacity, ambient temperature and historical load data of the main power supply line in the distribution system, setting the upper and lower limit values ​​of the load power corresponding to the switching bypass of the distribution system.

[0042] As a preferred option, see Figure 2 As shown, the specific analysis process of step 1 includes: extracting the rated capacity of the main power supply line in the power distribution system stored in the database, obtaining the upper limit value and lower limit value of the load power of the main power supply line according to the preset upper limit value and lower limit value of the ratio between the load power of the main power supply line and the rated capacity of the main power supply line, and recording them as .

[0043] According to the set principle, the detection range of the main power supply line in the power distribution system is delineated, and the highest temperature within the detection range of the main power supply line is measured in real time by the temperature sensor, which is recorded as the ambient temperature of the main power supply line, and recorded as .

[0044] It should be noted that the setting principle is to determine the occupied space of the main power supply line according to the layout of the main power supply line, and define the occupied space as the detection range of the main power supply line, where the environmental parameters of the detection range (such as temperature) will have a significant impact on the operation of the main power supply line.

[0045] Set the upper limit of the load power of the main power supply line and the ambient temperature of the main power supply line Substitute into the calculation formula Analyze the reference upper limit value of the load power of the main power supply line , Indicates the preset warning value of the main power supply line ambient temperature. Indicates the overshoot of the ambient temperature of the main power supply line exceeding its warning value. Indicates the correction value of the load power limit of the main power supply line corresponding to the unit overshoot of the preset main power supply line ambient temperature exceeding its warning value. , .

[0046] Referring to the analysis method of the reference upper limit value of the load power of the main power supply line, the reference lower limit value of the load power of the main power supply line is analyzed and recorded as .

[0047] It should be noted that the reference lower limit value of the load power of the main power supply line is analyzed. The specific process is: the lower limit value of the load power of the main power supply line is and the ambient temperature of the main power supply line Substitute into the calculation formula Analyze the reference lower limit value of the load power of the main power supply line .

[0048] It should be noted that the rated capacity of the main power supply line in the power distribution system is the rated power of the main power supply line.

[0049] It should be noted that the upper limit and the lower limit of the ratio between the load power of the main power supply line and the rated capacity of the main power supply line are manually set according to actual application requirements.

[0050] It should be noted that the upper limit of the ratio between the load power of the main power supply line and the rated capacity of the main power supply line is set for safety reasons. The load power of the main power supply line must be lower than the maximum carrying capacity of the main power supply line, leaving a safety margin to cope with instantaneous overload or measurement error.

[0051] It should be noted that the lower limit of the ratio between the load power of the main power supply line and the rated capacity of the main power supply line is set for energy saving. When the load power of the main power supply line is too low and below the energy saving threshold, it indicates that the main power supply line is in a low load state. At this time, the main power supply line may generate unnecessary energy consumption due to inefficiency or redundant operation.

[0052] In a specific embodiment, the upper limit of the ratio between the load power of the main power supply line and the rated capacity of the main power supply line is 80%-90%, and the lower limit of the ratio between the load power of the main power supply line and the rated capacity of the main power supply line is 30%-40%.

[0053] It should be noted that the interval formed by the upper limit value and the lower limit value of the load power of the main power supply line is the appropriate range of the load power of the main power supply line.

[0054] It should be noted that in high temperature environments, the load power limit of the main power supply line in the power distribution system needs to be reduced to prevent thermal failure of the equipment. In a specific embodiment, the load power limit of the main power supply line is reduced by 5% for every 10°C increase in ambient temperature.

[0055] As a preferred solution, the specific analysis process of step 1 further includes: extracting historical load data of the main power supply line in the power distribution system stored in the database, obtaining the peak value, peak duration, valley value, and valley duration of the historical load power of the main power supply line, and recording the peak value and valley value of the historical load power of the main power supply line as .

[0056] Set the reference upper limit of the load power of the main power supply line to and the peak value of the historical load power of the main power supply line Substitute into the calculation formula Analyze the load power upper limit corresponding to the bypass switching of the distribution system ,in They represent the weights of the preset reference upper limit of the load power of the main power supply line and the historical peak value of the load power of the main power supply line, respectively. , .

[0057] Referring to the analysis method of the upper limit of the load power corresponding to the bypass switching of the distribution system, the lower limit of the load power corresponding to the bypass switching of the distribution system is analyzed and recorded as .

[0058] It should be noted that the analysis of the load power lower limit corresponding to the bypass switching of the distribution system is as follows: the reference lower limit of the load power of the main power supply line is and the valley value of the historical load power of the main power supply line Substitute into the calculation formula Analyze the load power lower limit corresponding to the bypass switching of the distribution system ,in They represent the weights of the preset reference lower limit of the load power of the main power supply line and the historical load power valley value of the main power supply line, , .

[0059] It should be noted that the load power lower limit corresponding to the bypass switching of the distribution system is In the calculation formula, when the historical load power is the valley value Lower than or equal to the reference lower limit of load power When the load power is directly used, the reference lower limit value , which can avoid frequent switching of bypass and reduce equipment loss; when the reference lower limit of load power When the value is lower, the weighted average introduces historical data correction to prevent the actual load potential from being ignored due to overly conservative reference values. Through weight distribution, the calculation formula partially absorbs the fluctuation characteristics of historical data while relying on the reference value, thereby improving the robustness of the limit setting.

[0060] It should be noted that, in a feasible simulation process, the weights of the preset reference lower limit value of the load power of the main power supply line and the historical load power valley value of the main power supply line are manually set at the beginning of the system operation. In this embodiment, , the simulation results can be obtained. Please refer to Table 1 for details, which lists some representative data.

[0061] Table 1. Calculation results of the load power lower limit corresponding to switching to bypass in some different scenarios

[0062]

[0063] It should be noted that the peak value and peak duration corresponding to each peak of the historical load power of the main power supply line are averaged to obtain the peak value and peak duration of the historical load power of the main power supply line. The valley value and valley duration corresponding to each trough of the historical load power of the main power supply line are averaged to obtain the valley value and valley duration of the historical load power of the main power supply line.

[0064] It should be noted that the upper and lower limit values ​​of the load power corresponding to the switching of the distribution system to bypass means that when the load power of the main power supply line in the distribution system is greater than or equal to the upper limit value or less than or equal to the lower limit value, the bypass is switched.

[0065] In this embodiment, the present invention sets the upper and lower limit values ​​of the load power corresponding to the switching bypass according to the rated capacity, ambient temperature and historical load data of the main power supply line, improves the rationality of the load power limit setting, and combines the dynamic load power of the main power supply line to judge whether the load meets the bypass trigger condition. The bypass control method with adaptive threshold is adopted, which can better adapt to dynamic load changes and reduce frequent false operations and energy waste.

[0066] Step 2: Use multi-source heterogeneous sensors to collect electrical parameters of the main power supply line in real time to determine whether the main power supply line is operating abnormally and whether the main power supply line meets the bypass triggering conditions.

[0067] As a preferred solution, the specific analysis process of step 2 includes: collecting electrical parameters of the main power supply line in real time through multi-source heterogeneous sensors, where the electrical parameters include voltage, current and power factor, which are respectively recorded as .

[0068] Extract the expected values ​​of the electrical parameters of the main power supply line stored in the database to obtain the expected values ​​of the voltage, current and power factor of the main power supply line, which are recorded as .

[0069] Substitute the voltage, current, power factor and their corresponding expected values ​​of the main power supply line into the calculation formula Analyze the operating status evaluation coefficient of the main power supply line ,in represents a natural constant, The threshold values ​​respectively represent the fluctuation amounts of the voltage and current of the preset main power supply line.

[0070] It should be noted that the above formula can effectively reflect the difference between the actual electrical parameters of the main power supply line and the expected value by combining the exponential function and the proportional function. The exponential part is used to measure the impact of voltage fluctuation and current fluctuation on the operating state of the main power supply line. The greater the fluctuation, the more significant the impact; the proportional part is used to reflect the proportional relationship between the power factor and the expected value. The greater the power factor, the better the operating state of the main power supply line; this combination can comprehensively consider the impact of voltage, current and power factor on the operating state of the main power supply line and provide a comprehensive evaluation.

[0071] It should be noted that in a feasible simulation process, the expected values ​​of the voltage, current and power factor of the main power supply line and the thresholds of the fluctuation amount of the voltage and current of the main power supply line are preset manually at the beginning of the system operation. , , the simulation results can be obtained. Please refer to Table 2 for details, which lists some representative data.

[0072] Table 2. Electrical parameters and calculation results of some main power supply lines collected in real time

[0073]

[0074] Through calculation and simulation verification, the operating status evaluation coefficient of group 1 is the highest, indicating that its operating status is closest to the expected value; the operating status evaluation coefficients of groups 2 and 3 are lower, indicating that there is a certain deviation between their operating status and the expected value. It can be seen that the above calculation formula can reasonably evaluate the operating status of the main power supply line and can effectively solve the problem, which has practical application value.

[0075] It should be noted that the expected values ​​of the electrical parameters of the main power supply line refer to the electrical parameters corresponding to the long-term stable operation of the main power supply line.

[0076] As a preferred scheme, the specific analysis process of step two also includes: comparing the operating status evaluation coefficient of the main power supply line with a preset operating status evaluation coefficient threshold; if the operating status evaluation coefficient of the main power supply line is less than the preset operating status evaluation coefficient threshold, the main power supply line operates abnormally; otherwise, the main power supply line operates normally.

[0077] As a preferred scheme, the specific analysis process of step two also includes: if the main power supply line operates abnormally and the duration of the abnormal state is greater than or equal to a preset duration threshold, the main power supply line meets the bypass trigger condition; otherwise, the main power supply line does not meet the bypass trigger condition.

[0078] It should be noted that if the main power supply line operates normally or the main power supply line operates abnormally but the duration of the abnormal state is less than the preset duration threshold, the main power supply line does not meet the bypass triggering condition.

[0079] Step 3: Monitor the dynamic load power of the main power supply line in real time to determine whether the load meets the bypass triggering condition.

[0080] As a preferred solution, the specific analysis process of step three is: real-time monitoring of the dynamic load power of the main power supply line. If the dynamic load power is within the range formed by the lower limit and upper limit of the load power corresponding to the bypass switching of the distribution system, the load does not meet the bypass trigger condition.

[0081] If the dynamic load power is greater than or equal to the load power upper limit corresponding to the distribution system switching bypass and the maintenance duration is greater than or equal to the peak duration of the historical load power of the main power supply line, the load meets the bypass triggering conditions.

[0082] If the dynamic load power is less than or equal to the load power lower limit corresponding to the distribution system switching bypass and the maintenance duration is greater than or equal to the valley duration of the historical load power of the main power supply line, the load meets the bypass triggering conditions.

[0083] In this embodiment, the present invention monitors the operating status of the main power supply line and the dynamic load conditions to determine whether the main power supply line and the load meet the bypass triggering conditions. It can not only dynamically adjust the use of the bypass according to the load conditions to achieve power saving effects, but also ensure that the distribution system can reliably switch and avoid power outages when the main power supply line fails.

[0084] Step 4: If the main power supply line or the load meets the bypass triggering condition, a plurality of bypass power supply paths are generated according to the preset bypass control rules.

[0085] Step 5: Select the optimal bypass power supply path based on the evaluation indicators of capacity and load matching, electrical parameter stability, path efficiency, and switching performance.

[0086] As a preferred solution, the specific analysis process of step five includes: extracting the rated capacity of each bypass power supply path from the database, and monitoring the current load of each bypass power supply path in real time to obtain the remaining capacity of each bypass power supply path.

[0087] The difference between the rated capacity of each bypass power supply path and the rated capacity of the main power supply line is called the relative deviation of the rated capacity of each bypass power supply path.

[0088] The remaining capacity of each bypass power supply path is compared with the dynamic load power of the main power supply line, and the difference between the two is calculated, which is defined as the relative deviation of the remaining capacity of each bypass power supply path.

[0089] The comparison table of the relationship between the relative deviation of the rated capacity and the relative deviation of the remaining capacity of the bypass power supply path and the capacity and load matching degree of the bypass power supply path when the main power supply line operates abnormally, the dynamic load power exceeds the upper limit, and the dynamic load power is below the lower limit stored in the database is consulted, and the capacity and load matching degree of each bypass power supply path is determined based on the two relative deviation values ​​calculated previously.

[0090] It should be noted that when the main power supply line operates abnormally, a bypass power supply path with a rated capacity close to the rated capacity of the main power supply line is preferred; when the dynamic load power of the main power supply line exceeds the upper limit, a bypass power supply path with a rated capacity greater than the rated capacity of the main power supply line is preferred; when the dynamic load power of the main power supply line is lower than the lower limit, a bypass power supply path with a rated capacity less than the rated capacity of the main power supply line is preferred.

[0091] It should be noted that by monitoring the current load of each bypass power supply path, it is avoided to select a bypass power supply path that is close to full load.

[0092] As a preferred solution, the specific analysis process of step five also includes: extracting the historical operation data of each bypass power supply path stored in the database, obtaining the historical voltage fluctuation range and historical harmonic content of each bypass power supply path, and matching the electrical parameter stability coefficient of each bypass power supply path based on the relationship comparison table between the historical voltage fluctuation range, historical harmonic content and the electrical parameter stability coefficient of the bypass power supply path stored in the database.

[0093] It should be noted that if the historical voltage fluctuation range of the bypass power supply path is smaller and the historical harmonic content is smaller, the electrical parameter stability coefficient of the bypass power supply path is larger.

[0094] In a specific embodiment, a bypass power supply path with a voltage fluctuation range of within ±5% and a harmonic distortion rate of less than 5% is preferred.

[0095] The line impedance and topological distance of each bypass power supply path are obtained, and the relationship comparison table between the line impedance, topological distance and path efficiency of the bypass power supply path stored in the database is extracted to match the path efficiency of each bypass power supply path.

[0096] It should be noted that the lower the line impedance of the bypass power supply path and the shorter the topological distance, the higher the path efficiency of the bypass power supply path.

[0097] According to the historical operation data of each bypass power supply path, the switching time and switching success rate of each bypass power supply path are obtained, and the relationship comparison table between the switching time and switching success rate of the bypass power supply path and the switching performance coefficient of the bypass power supply path stored in the database is extracted to match the switching performance coefficient of each bypass power supply path.

[0098] It should be noted that the shorter the switching time of the bypass power supply path and the higher the switching success rate, the greater the switching performance coefficient of the bypass power supply path.

[0099] As a preferred solution, the specific analysis process of step five also includes: calculating the weighted average of the capacity and load matching, electrical parameter stability coefficient, path efficiency, and switching performance coefficient of each bypass power supply path to obtain the recommended coefficient of each bypass power supply path.

[0100] It should be noted that the weights of capacity and load matching, electrical parameter stability coefficient, path efficiency, and switching performance coefficient are set according to their importance in the bypass power supply path evaluation. In a specific implementation, the weights of capacity and load matching, electrical parameter stability coefficient, path efficiency, and switching performance coefficient are 0.30, 0.35, 0.20, and 0.15, respectively.

[0101] The bypass power supply paths are ranked in descending order according to their recommendation coefficients, and the bypass power supply path ranked first is recorded as the optimal bypass power supply path.

[0102] In this embodiment, the present invention evaluates each bypass power supply path from the dimensions of capacity and load matching, electrical parameter stability, path efficiency, switching performance, etc., and then selects the optimal bypass power supply path. It can evaluate and select each optional bypass when switching the bypass, which is conducive to giving full play to the energy-saving potential of the power distribution and power saving system.

[0103] Step 6: Switch to the optimal bypass power supply path through the intelligent switch array until the main power supply line returns to normal or meets the exit condition.

[0104] It should be noted that satisfying the exit condition means that the load no longer satisfies the bypass trigger condition. If the dynamic load power is within the range of the load power lower limit and upper limit corresponding to the power distribution system switching bypass, the load does not meet the bypass trigger condition.

[0105] In a specific implementation, the power distribution system is a low-voltage power distribution system. After obtaining the optimal bypass power supply path, the corresponding bypass control instruction is generated, and the bypass control instruction is sent to the power-saving bypass cabinet of the low-voltage power distribution system, wherein the power-saving bypass cabinet integrates an intelligent switch array and a power saver of the distribution system.

[0106] The above contents are merely examples and explanations of the concept of the present invention. Those skilled in the art may make various modifications or additions to the specific embodiments described or replace them in a similar manner. As long as they do not deviate from the concept of the invention or exceed the scope defined by the present invention, they shall all fall within the protection scope of the present invention.

Claims

1. A bypass control method for a power distribution and power saving system, characterized in that: The steps include: Step 1: According to the rated capacity, ambient temperature and historical load data of the main power supply line in the power distribution system, set the upper and lower limit values ​​of the load power corresponding to the bypass switching of the power distribution system; Step 2: Collect electrical parameters of the main power supply line in real time through multi-source heterogeneous sensors to determine whether the main power supply line is operating abnormally and whether the main power supply line meets the bypass triggering conditions; Step 3: Monitor the dynamic load power of the main power supply line in real time to determine whether the load meets the bypass triggering condition; Step 4: If the main power supply line or load meets the bypass triggering condition, a plurality of bypass power supply paths are generated according to the preset bypass control rules; Step 5: Select the optimal bypass power supply path based on the evaluation indicators of capacity and load matching, electrical parameter stability, path efficiency, and switching performance; Step 6: Switch to the optimal bypass power supply path through the intelligent switch array until the main power supply line returns to normal or meets the exit condition.

2. A bypass control method for a power distribution and power saving system according to claim 1, characterized in that: The specific analysis process of step 1 includes: Extract the rated capacity of the main power supply line in the power distribution system stored in the database, and obtain the upper limit and lower limit of the load power of the main power supply line according to the preset upper limit and lower limit of the ratio between the load power of the main power supply line and the rated capacity of the main power supply line, and record them as ; According to the set principle, the detection range of the main power supply line in the power distribution system is delineated, and the highest temperature within the detection range of the main power supply line is measured in real time by the temperature sensor, which is recorded as the ambient temperature of the main power supply line, and recorded as ; Set the upper limit of the load power of the main power supply line and the ambient temperature of the main power supply line Substitute into the calculation formula Analyze the reference upper limit value of the load power of the main power supply line , Indicates the preset warning value of the main power supply line ambient temperature. Indicates the overshoot of the ambient temperature of the main power supply line exceeding its warning value. Indicates the correction value of the load power limit of the main power supply line corresponding to the unit overshoot of the preset main power supply line ambient temperature exceeding its warning value. , ; Referring to the analysis method of the reference upper limit value of the load power of the main power supply line, the reference lower limit value of the load power of the main power supply line is analyzed and recorded as .

3. A bypass control method for a power distribution and power saving system according to claim 2, characterized in that: The specific analysis process of step 1 also includes: Extract the historical load data of the main power supply line in the distribution system stored in the database, obtain the peak value, peak duration, valley value, and valley duration of the historical load power of the main power supply line, and record the peak value and valley value of the historical load power of the main power supply line as ; Set the reference upper limit of the load power of the main power supply line to and the peak value of the historical load power of the main power supply line Substitute into the calculation formula Analyze the load power upper limit corresponding to the bypass switching of the distribution system ,in They represent the weights of the preset reference upper limit of the load power of the main power supply line and the historical peak value of the load power of the main power supply line, respectively. , ; Referring to the analysis method of the upper limit of the load power corresponding to the bypass switching of the distribution system, the lower limit of the load power corresponding to the bypass switching of the distribution system is analyzed and recorded as .

4. The bypass control method for a power distribution and power saving system according to claim 1, characterized in that: The specific analysis process of step 2 includes: The electrical parameters of the main power supply line are collected in real time through multi-source heterogeneous sensors, where the electrical parameters include voltage, current and power factor, which are recorded as ; Extract the expected values ​​of the electrical parameters of the main power supply line stored in the database to obtain the expected values ​​of the voltage, current and power factor of the main power supply line, which are recorded as ; Substitute the voltage, current, power factor and their corresponding expected values ​​of the main power supply line into the calculation formula Analyze the operating status evaluation coefficient of the main power supply line ,in represents a natural constant, The threshold values ​​respectively represent the fluctuation amounts of the voltage and current of the preset main power supply line.

5. A bypass control method for a power distribution and power saving system according to claim 4, characterized in that: The specific analysis process of step 2 also includes: The operating status evaluation coefficient of the main power supply line is compared with the preset operating status evaluation coefficient threshold. If the operating status evaluation coefficient of the main power supply line is less than the preset operating status evaluation coefficient threshold, the main power supply line is operating abnormally; otherwise, the main power supply line is operating normally.

6. A bypass control method for a power distribution and power saving system according to claim 1, characterized in that: The specific analysis process of step 2 also includes: If the main power supply line operates abnormally and the duration of the abnormal state is greater than or equal to the preset duration threshold, the main power supply line meets the bypass triggering condition; otherwise, the main power supply line does not meet the bypass triggering condition.

7. A bypass control method for a power distribution and power saving system according to claim 3, characterized in that: The specific analysis process of step three is as follows: Monitor the dynamic load power of the main power supply line in real time. If the dynamic load power is within the range of the load power lower limit and upper limit corresponding to the bypass switching of the distribution system, the load does not meet the bypass triggering condition. If the dynamic load power is greater than or equal to the upper limit of the load power corresponding to the bypass switching of the distribution system and the duration is greater than or equal to the peak duration of the historical load power of the main power supply line, the load meets the bypass triggering condition; If the dynamic load power is less than or equal to the load power lower limit corresponding to the distribution system switching bypass and the maintenance duration is greater than or equal to the valley duration of the historical load power of the main power supply line, the load meets the bypass triggering conditions.

8. The bypass control method for a power distribution and power saving system according to claim 1, characterized in that: The specific analysis process of step 5 includes: Extract the rated capacity of each bypass power supply path from the database, and monitor the current load of each bypass power supply path in real time to obtain the remaining capacity of each bypass power supply path; The difference between the rated capacity of each bypass power supply path and the rated capacity of the main power supply line is calculated, which is called the relative deviation of the rated capacity of each bypass power supply path; Compare the remaining capacity of each bypass power supply path with the dynamic load power of the main power supply line, and calculate the difference between the two, which is defined as the relative deviation of the remaining capacity of each bypass power supply path; The comparison table of the relationship between the relative deviation of the rated capacity and the relative deviation of the remaining capacity of the bypass power supply path and the capacity and load matching degree of the bypass power supply path when the main power supply line operates abnormally, the dynamic load power exceeds the upper limit, and the dynamic load power is below the lower limit stored in the database is consulted, and the capacity and load matching degree of each bypass power supply path is determined based on the two relative deviation values ​​calculated previously.

9. A bypass control method for a power distribution and power saving system according to claim 8, characterized in that: The specific analysis process of step 5 also includes: Extract the historical operation data of each bypass power supply path stored in the database, obtain the historical voltage fluctuation range and historical harmonic content of each bypass power supply path, and match the electrical parameter stability coefficient of each bypass power supply path according to the relationship comparison table between the historical voltage fluctuation range and historical harmonic content of the bypass power supply path stored in the database and the electrical parameter stability coefficient of the bypass power supply path; Obtain the line impedance and topological distance of each bypass power supply path, extract the relationship comparison table between the line impedance, topological distance and path efficiency of the bypass power supply path stored in the database, and match to obtain the path efficiency of each bypass power supply path; According to the historical operation data of each bypass power supply path, the switching time and switching success rate of each bypass power supply path are obtained, and the relationship comparison table between the switching time and switching success rate of the bypass power supply path and the switching performance coefficient of the bypass power supply path stored in the database is extracted to match the switching performance coefficient of each bypass power supply path.

10. A bypass control method for a power distribution and power saving system according to claim 9, characterized in that: The specific analysis process of step 5 also includes: The capacity and load matching degree, electrical parameter stability coefficient, path efficiency, and switching performance coefficient of each bypass power supply path are calculated by weighted average to obtain the recommended coefficient of each bypass power supply path; The bypass power supply paths are ranked in descending order according to their recommendation coefficients, and the bypass power supply path ranked first is recorded as the optimal bypass power supply path.

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