Power grid adjustment method applied to fracturing pump set control, and system

Abstract

The present invention belongs to the technical field of oil and gas development. Provided are a power grid adjustment method applied to fracturing pump set control, and a system. The method comprises: setting the maximum capacity of a fracturing pump and the maximum capacity of a power grid under each power grid incoming line; starting a fracturing pump set, enabling a power grid automatic equalization function and a power grid self-protection function, and initializing a power grid weight coefficient and a fracturing pump output coefficient; monitoring whether the displacement of each power grid incoming line can be increased or reduced; executing the power grid automatic equalization function on the basis of a monitoring result and the power grid weight coefficient, and executing the power grid self-protection function on the basis of the monitoring result and the fracturing pump output coefficient; and on the basis of execution results, adjusting the working displacement of the fracturing pump under each power grid incoming line, so as to complete the adjustment of the power grid in fracturing pump set control. Compared with an original manual adjustment mode, the present invention can determine the running situation of a power grid more accurately in a more timely manner, and a manual operation can be effectively replaced; moreover, a power grid adjustment process in the running of the system in the present application is more timely and reliable, such that an adjustment result is more accurate.

Description

A grid regulation method and system for controlling a fracturing pump group Technical Field

[0001] The present invention belongs to the technical field of oil and gas development, and in particular relates to a power grid regulation method and system used in controlling a fracturing pump group. Background Art

[0002] During fracturing, there are usually about four high-voltage power grids providing power to the fracturing system. The capacity of each power grid is limited by the power supply bureau and can only operate at a certain capacity. During the control process of the fracturing pump group, the fracturing pump relies on the pump capacity to obtain the displacement. Due to the high-power characteristics of the fracturing pump, if the construction pressure is too high or the equipment under other power grids stops abnormally during construction, some power grids will face the risk of jumping. Manual adjustment of the load distribution of each power grid is necessary to ensure the smooth progress of the construction process. The existing manual adjustment method relies on the personal experience of the operator for the control effect. When there are many power grid lines and the pump conditions of each fracturing pump are different, the operator's adjustment difficulty increases, and there is a lag in the adjustment results, resulting in low adjustment efficiency and unsatisfactory control effect.

[0003] Summary of the Invention

[0004] In response to the above-mentioned deficiencies in the prior art, the present invention provides a grid regulation method and system for controlling a fracturing pump group, which solves the problems of unreasonable load distribution of various grids and untimely intervention due to excessively high load rates during fracturing construction.

[0005] In order to achieve the above purpose, the technical solution adopted by the present invention is:

[0006] This solution provides a power grid regulation method for controlling a fracturing pump group, comprising the following steps:

[0007] S1. Set the maximum capacity of the fracturing pump and the power grid under each power grid inlet line;

[0008] S2. Start the fracturing pump group, turn on the automatic balancing and self-protection functions of the power grid, and initialize the power grid weight coefficient and the fracturing pump output coefficient;

[0009] S3, monitor the power grid incoming lines to see if they can adjust the displacement up or down;

[0010] S4. Executing the automatic balancing function of the power grid according to the monitoring results and the power grid weight coefficient, and executing the self-protection function of the power grid according to the monitoring results and the fracturing pump output coefficient;

[0011] S5. According to the execution result, adjust the working displacement of the fracturing pumps under each power grid inlet line to complete the regulation of the power grid in the fracturing pump group control.

[0012] The beneficial effects of the present invention are as follows: the present invention combines the capacity of the fracturing pumps under each power grid, calculates the weight factor of the power grid and weights it to the existing pump group allocation method, so that the distribution method of the pump group control displacement is based on both the pump condition capacity and the power grid load rate, and finally realizes automatic adjustment of the power grid load, so that the load of each power grid is reasonably distributed, and when the power grid load has the risk of jumping the power grid, the load is actively reduced to ensure the stability of the power grid. Compared with the original manual adjustment method, the present invention can judge the operation status of the power grid more timely and accurately. The present invention replaces the operation of an experienced technician. The power grid adjustment process in the system operation is more timely and reliable, and the adjustment result is more accurate.

[0013] Furthermore, the S3 includes the following steps:

[0014] S301, monitoring the power grid where the displacement of the fracturing pump group can be increased;

[0015] S302, monitoring the power grid where the displacement of the fracturing pump group can be adjusted downward;

[0016] S303: Monitor the real-time load rate of the power grid that can reduce the discharge capacity.

[0017] The beneficial effect of the above further solution is: by real-time monitoring of the maximum working capacity output of the fracturing pump and the load rate of the power grid, it is determined according to preset conditions whether to enter the automatic adjustment link of the power grid.

[0018] Furthermore, the S301 includes the following steps:

[0019] A1. Scan the current power grid from the first fracturing pump to the last fracturing pump;

[0020] A2. When the fracturing pump belongs to the current power grid, determine whether the fracturing pump is in the fracturing pump group control mode and whether the operating displacement of the fracturing pump is less than the maximum working capacity. If it is in the fracturing pump group control mode and the operating displacement of the fracturing pump is less than the maximum working capacity, then assign the value of Power_up[N] to 1, indicating that the displacement of the current power grid incoming line can be increased; otherwise, assign the value of Power_up[N] to 0, indicating that the displacement of the current power grid incoming line cannot be increased. Among them, Power_up[N] indicates whether the displacement of the power grid incoming line N can be increased. When the value is 0, it means that the displacement cannot be increased. When the value is 1, it means that the displacement can be increased. N represents the number of the power grid incoming line;

[0021] A3. Determine whether all power grids have been scanned. If so, obtain the power grid whose displacement can be increased under the control of the fracturing pump group according to the determination result of A2. Otherwise, return to A1 until all power grids are scanned.

[0022] The beneficial effect of the above further solution is: by monitoring the actual working capacity of the equipment under each power grid, the working condition of the equipment is analyzed, and the power grid number in the fracturing pump group that meets the conditions for increasing the displacement is found.

[0023] Furthermore, the S302 includes the following steps:

[0024] B1. Scan the current power grid from the first fracturing pump to the last fracturing pump;

[0025] B2. When the fracturing pump belongs to the current power grid, determine whether the fracturing pump is in the fracturing pump group control mode and whether the operating displacement of the fracturing pump is greater than 0. If it is in the fracturing pump group control mode and the operating displacement of the fracturing pump is greater than 0, then assign the value of Power_down[N] to 1, indicating that the current power grid can reduce the displacement; otherwise, assign the value of Power_down[N] to 0, indicating that the current power grid cannot reduce the displacement. Among them, Power_down[N] indicates whether the power grid incoming line N can reduce the displacement. A value of 0 indicates that the displacement cannot be reduced, a value of 1 indicates that the displacement can be reduced, and N indicates the number of the power grid incoming line;

[0026] B3. Determine whether all power grids have been scanned. If so, obtain the power grid whose displacement can be reduced under the control of the fracturing pump group according to the determination result of B2. Otherwise, return to B1 until all power grids are scanned.

[0027] The beneficial effect of the above further solution is: by monitoring the actual working capacity of the equipment under each power grid, the working condition of the equipment is analyzed, and the power grid number in the fracturing pump group that meets the conditions for reducing the displacement is found.

[0028] Furthermore, the automatic balancing of the power grid is performed in S4, including the following steps:

[0029] C1. Turn on the automatic balancing function of the power grid and initialize the power grid weight coefficient to 100% before the fracturing pump group runs to the large displacement weight distribution stage;

[0030] C2. After entering the large displacement weight allocation stage, the load rate of the power grid that can adjust the displacement downward is refreshed in real time. When the load rate of the power grid that can adjust the displacement downward exceeds the critical value of the first threshold, the power grid with the lowest load rate among the power grids that can adjust the displacement upward under the control of the fracturing pump group is found;

[0031] C3. When the difference between the load rate of the grid with the lowest load rate among the grids that can increase the displacement and the load rate of the grid that needs to decrease the displacement exceeds the second threshold, the grid that needs to decrease the displacement will transfer the grid weight coefficient to the grid with the lowest load rate to complete the execution of automatic grid balancing.

[0032] The beneficial effect of this further solution is that while existing fracturing pump group displacement allocation methods use pump capacity weighting, the present invention superimposes a grid weighting factor on top of this pump capacity weighting. Grids that need to reduce their load factor have their grid weighting factor reduced, while those that need to increase their load factor have their grid weighting factor increased. By controlling the displacement allocation across various grids through these weighting factors, the effective utilization of grid capacity is achieved.

[0033] Furthermore, after the power grid in C3 that needs to reduce its displacement transfers its grid weight coefficient to the power grid with the lowest load rate, the displacement allocated to a single fracturing pump in the fracturing pump group is expressed as follows:

[0034] Among them, V n_set The displacement of a single fracturing pump in the fracturing pump group is V after the power grid that needs to reduce the displacement transfers the grid weight coefficient to the power grid with the lowest load rate. 泵组set Indicates the total displacement of the fracturing pump group, V n大 Indicates the maximum working capacity weight coefficient of the fracturing pump, C n电网 Indicates the grid weight coefficient of the power grid where the fracturing pump is located.

[0035] The beneficial effect of the above further solution is that the displacement distribution of the fracturing pumps in the fracturing pump group is weighted by the power grid weight coefficient on the basis of the working capacity weight distribution, so that the displacement distribution of the fracturing pumps takes into account the reasonable distribution of the power grid capacity.

[0036] Furthermore, the self-protection function of the power grid is executed in S4, which is specifically:

[0037] D1. Enable the self-protection function of the power grid and initialize the output coefficient of the fracturing pump to 100% before the fracturing pump group is operated;

[0038] D2. During the operation of the fracturing pump group, when the load rate of the power grid exceeds the critical value of the third threshold, it is determined whether the power grid can reduce the displacement. If so, the process proceeds to D3. Otherwise, the power grid cannot reduce the displacement, an alarm prompt is output, and the process ends.

[0039] D3. Setting the grid regulation enable, reducing the fracturing pump output coefficient of the grid until the load rate of the grid is less than a fourth threshold, and then resetting the grid regulation enable;

[0040] D5. After the grid regulation is enabled, if the fracturing pump output coefficient needs to be restored, in the automatic fracturing pump group mode, the fracturing pump output coefficient is restored to 100% according to the intelligent adjustment; in the manual fracturing pump group mode, the fracturing pump output coefficient is manually restored to 100% to complete the execution of the grid self-protection function.

[0041] The beneficial effect of this further solution is to proactively reduce the grid's output coefficient by monitoring whether the grid load factor is excessively high. This output coefficient is applied to the fracturing pump capacity distribution within the grid, reducing the fracturing pump capacity within the grid and, in turn, reducing the load factor. This prevents grid trips due to excessive load factors and ensures stable grid operation. When pressure decreases during construction, allowing the grid load factor and capacity to be increased, the output coefficient is restored through intelligent adjustment or manual control.

[0042] Furthermore, after reducing the output coefficient of the fracturing pump under the power grid, the expression of the fracturing pump group control displacement executed by the fracturing pump is as follows: V n_get =V n_set ×V n_电网_Co

[0043] Among them, V n_get It represents the actual controlled displacement of the fracturing pump group after reducing the fracturing pump output coefficient under the power grid, V n_set The displacement of a single fracturing pump in the fracturing pump group is V after the power grid that needs to reduce the displacement transfers the grid weight coefficient to the power grid with the lowest load rate. n_电网_Co Indicates the output coefficient of the power grid where the fracturing pump is located.

[0044] The beneficial effect of the above further solution is: controlling the final displacement distribution of the fracturing pump through the power grid output coefficient, thereby achieving the effect of intervening in the power grid load rate.

[0045] The present invention provides a power grid regulation system for executing a power grid regulation method applied to the control of a fracturing pump group, comprising:

[0046] The first processing module is used to set the maximum capacity of the fracturing pump and the power grid under each power grid inlet line;

[0047] The second processing module is used to start the fracturing pump group, turn on the automatic balancing and self-protection functions of the power grid, and initialize the power grid weight coefficient and the fracturing pump output coefficient;

[0048] The third processing module is used to monitor whether the displacement of each grid incoming line can be adjusted up or down;

[0049] a fourth processing module, configured to execute an automatic grid balancing function based on the monitoring results and the grid weight coefficient, and to execute a grid self-protection function based on the monitoring results and the fracturing pump output coefficient;

[0050] The fifth processing module is used to adjust the working displacement of the fracturing pumps under each power grid incoming line according to the execution result, and complete the regulation of the power grid in the fracturing pump group control.

[0051] The beneficial effects of the present invention are as follows: the present invention combines the capabilities of the fracturing pumps under each power grid, calculates the weight factor of the power grid and weights it to the existing pump group allocation method, so that the fracturing pump group control the displacement distribution method based on both the pump capacity and the power grid load rate, and finally realizes automatic adjustment of the power grid load, so that the load of each power grid is reasonably distributed, and when the power grid load has the risk of jumping the power grid, the load is actively reduced to ensure the stability of the power grid. Compared with the original manual adjustment method, the present invention can judge the operation status of the power grid more timely and accurately, and can replace the operation of an experienced technician. The power grid adjustment process in the system operation is more timely and reliable, and the adjustment result is more accurate. BRIEF DESCRIPTION OF THE DRAWINGS

[0052] FIG1 is a flow chart of the method of the present invention.

[0053] FIG2 is a schematic diagram of the system structure of the present invention. DETAILED DESCRIPTION

[0054] The specific embodiments of the present invention are described below to facilitate understanding of the present invention by those skilled in the art. However, it should be clear that the present invention is not limited to the scope of the specific embodiments. For those skilled in the art, as long as various changes are within the spirit and scope of the present invention as defined and determined by the appended claims, these changes are obvious, and all inventions and creations utilizing the concepts of the present invention are protected.

[0055] Example 1

[0056] The purpose of the present invention is to use a grid regulation method applied to the control of a fracturing pump group, combine the capacity of the fracturing pumps under each grid, calculate the weight factor of the grid and weight it to the existing fracturing pump group distribution method, so that the distribution method of the fracturing pump group control displacement is based on both the pump condition capacity and the grid load rate, and finally realize automatic adjustment of the grid load, so that the load of each grid is reasonably distributed, and when the grid load has the risk of jumping the grid, the load is actively reduced to ensure the stability of the grid. As shown in Figure 1, the present invention provides a grid regulation method applied to the control of a fracturing pump group, and its implementation method is as follows:

[0057] S1. Set the maximum capacity of the fracturing pump and the power grid under each power grid inlet line;

[0058] S2. Start the fracturing pump group, turn on the automatic balancing and self-protection functions of the power grid, and initialize the power grid weight coefficient and the fracturing pump output coefficient;

[0059] S3. Monitor the power grid incoming lines to see if they can adjust the displacement up or down. The implementation method is as follows:

[0060] S301, monitoring the power grid where the displacement of the fracturing pump group can be increased, and the implementation method is as follows:

[0061] A1. Scan the current power grid from the first fracturing pump to the last fracturing pump;

[0062] A2. When the fracturing pump belongs to the current power grid, determine whether the fracturing pump is in the fracturing pump group control mode and whether the operating displacement of the fracturing pump is less than the maximum working capacity. If it is in the fracturing pump group control mode and the operating displacement of the fracturing pump is less than the maximum working capacity, then assign the value of Power_up[N] to 1, indicating that the displacement of the current power grid incoming line can be increased; otherwise, assign the value of Power_up[N] to 0, indicating that the displacement of the current power grid incoming line cannot be increased. Among them, Power_up[N] indicates whether the displacement of the power grid incoming line N can be increased. When the value is 0, it means that the displacement cannot be increased. When the value is 1, it means that the displacement can be increased. N represents the number of the power grid incoming line;

[0063] A3. Determine whether all power grids have been scanned. If so, obtain the power grid whose displacement can be increased under the control of the fracturing pump group according to the determination result of A2. Otherwise, return to A1 until all power grids are scanned.

[0064] In this embodiment, the program automatically and cyclically scans the status of the fracturing pumps under all power grids. First, the first power grid is scanned, starting from the first fracturing pump to the last fracturing pump. When the fracturing pump belongs to the first power grid, if the fracturing pump is in the fracturing pump group mode and the operating displacement of the fracturing pump is less than the maximum working capacity, then Power_up[1] is assigned a value of 1, indicating that the power grid line 1 can be increased. Otherwise, Power_up[1] is assigned a value of 0, indicating that the power grid line 1 cannot be increased. After scanning the first power grid, the nth power grid is judged according to the same logic to obtain the power grid conditions that meet the requirements for increasing the displacement.

[0065] S302, monitoring the power grid where the displacement of the fracturing pump group can be reduced, and the implementation method is as follows:

[0066] B1. Scan the current power grid from the first fracturing pump to the last fracturing pump;

[0067] B2. When the fracturing pump belongs to the current power grid, determine whether the fracturing pump is in the fracturing pump group control mode and whether the operating displacement of the fracturing pump is greater than 0. If it is in the fracturing pump group control mode and the operating displacement of the fracturing pump is greater than 0, then assign the value of Power_down[N] to 1, indicating that the current power grid can reduce the displacement; otherwise, assign the value of Power_down[N] to 0, indicating that the current power grid cannot reduce the displacement. Among them, Power_down[N] indicates whether the power grid incoming line N can reduce the displacement. A value of 0 indicates that the displacement cannot be reduced, a value of 1 indicates that the displacement can be reduced, and N indicates the number of the power grid incoming line;

[0068] B3. Determine whether all power grids have been scanned. If so, obtain the power grid whose displacement can be reduced under the control of the fracturing pump group according to the determination result of B2. Otherwise, return to B1 until all power grids are scanned.

[0069] In this embodiment, the program automatically and cyclically scans the status of the fracturing pumps in all power grids. First, the first power grid is scanned, starting from the first fracturing pump to the last fracturing pump. When the fracturing pump belongs to the first power grid, if the pump is in the fracturing pump group mode and the operating displacement of the fracturing pump is greater than 0, then Power_down[1] is assigned a value of 1, indicating that the power grid line 1 can be lowered. Otherwise, Power_down[1] is assigned a value of 0, indicating that the power grid line 1 cannot be lowered. After scanning the first power grid, the nth power grid is judged according to the same logic to determine the power grid conditions that meet the requirements for lowering the displacement.

[0070] S303, monitoring the real-time load rate of the power grid whose discharge capacity can be reduced;

[0071] S4. Executing the automatic balancing function of the power grid according to the monitoring results and the power grid weight coefficient, and executing the self-protection function of the power grid according to the monitoring results and the fracturing pump output coefficient;

[0072] The automatic balancing of the power grid is performed, including the following steps:

[0073] C1. Turn on the automatic balancing function of the power grid and initialize the power grid weight coefficient to 100% before the fracturing pump group runs to the large displacement weight distribution stage;

[0074] C2. After entering the large displacement weight allocation stage, the load rate of the power grid that can adjust the displacement downward is refreshed in real time. When the load rate of the power grid that can adjust the displacement downward exceeds the critical value of the first threshold, the power grid with the lowest load rate among the power grids that can adjust the displacement upward under the control of the fracturing pump group is found;

[0075] C3. When the difference between the load rate of the grid with the lowest load rate among the grids that can increase the displacement and the load rate of the grid that needs to decrease the displacement exceeds the second threshold, the grid that needs to decrease the displacement will transfer the grid weight coefficient to the grid with the lowest load rate to complete the execution of automatic grid balancing.

[0076] In this embodiment, the automatic balancing function of the power grid is turned on, and the program automatically scans the operation of the fracturing pump group in a cycle. Before the fracturing pump group runs to the large displacement weight distribution stage, the system sets the power grid weight coefficient C 进线N电网Initialized to 100%. After entering the large displacement weight allocation phase, the system refreshes the load factor of the grids that can reduce displacement in real time. When the grid load factor exceeds the critical value of 85%, the system will search for a grid with a lower load factor among the grids that can increase displacement. If the load factor of this grid differs by more than 5% from the load factor of the grid that needs to reduce displacement, the grid that needs to reduce displacement will transfer 1% of the grid weight factor to this grid, giving the grid that needs to increase displacement a higher weight factor. Due to the change in weight factor, the fracturing pumps under the grid will regain the displacement allocated to the fracturing pump group, ultimately achieving a one-to-one load transfer between grids.

[0077] When the fracturing pump n belongs to the incoming power grid N, C n电网 =C 进线N电网 For example: Fracturing pump 3 belongs to incoming grid 1, then C 3电网 =C 进线1电网 .

[0078] The self-protection function of the power grid is specifically performed as follows:

[0079] D1. Enable the self-protection function of the power grid and initialize the output coefficient of the fracturing pump to 100% before the fracturing pump group is operated;

[0080] D2. During the operation of the fracturing pump group, when the load rate of the power grid exceeds the critical value of the third threshold, it is determined whether the power grid can reduce the displacement. If so, the process proceeds to D3. Otherwise, the power grid cannot reduce the displacement, an alarm prompt is output, and the process ends.

[0081] D3. Setting the grid regulation enable, reducing the fracturing pump output coefficient of the grid until the load rate of the grid is less than a fourth threshold, and then resetting the grid regulation enable;

[0082] D5. After the grid regulation is enabled, if the fracturing pump output coefficient needs to be restored, in the automatic fracturing pump group mode, the fracturing pump output coefficient is restored to 100% according to the intelligent adjustment; in the manual fracturing pump group mode, the fracturing pump output coefficient is manually restored to 100% to complete the execution of the grid self-protection function.

[0083] In this embodiment, the self-protection function of the power grid is turned on, and the program automatically scans the operation of the fracturing pump group in a cycle. Before the fracturing pump group is operated, the fracturing pump output coefficient C n_电网_Co Initialized to 100%. During the operation of the fracturing pump group, when the load rate of the power grid exceeds the critical value of 95%. If the power grid can not reduce the displacement, an alarm prompt will be output. If the power grid can reduce the displacement, the power grid regulation enable will be set, and the fracturing pump output coefficient under the power grid will be gradually reduced until the load rate of the power grid is less than 90%, and then the power grid regulation enable will be reset. After the power grid regulation enable is activated, the fracturing pump output coefficient C n_电网_CoIf recovery is required, in the automatic pump group mode, the fracturing pump output coefficient C can be gradually restored according to the needs of intelligent adjustment. n_电网_Co To 100%; in manual pump group mode, you can manually click the fracturing pump output coefficient C n_电网_Co Restore button to gradually restore the output coefficient to 100%.

[0084] S5. According to the execution result, adjust the working displacement of the fracturing pumps under each power grid inlet line to complete the regulation of the power grid in the fracturing pump group control.

[0085] In this embodiment, the current displacement distribution of the fracturing pump group is calculated based on the maximum working capacity weight of the fracturing pump. The maximum working capacity V n大 According to the real-time fracturing pump condition, the displacement V of each pump in the fracturing pump group is set. n_set Equal to the total displacement V of the fracturing pump group 泵组set Multiply by the maximum working capacity weight coefficient V n大 , realizing the working mode of allocation according to pump capacity. The calculation formula is as follows:

[0086] The present invention judges the real-time load rate of the power grid, combines the operating status of the fracturing pumps under each power grid, increases the power grid weight coefficient on the basis of the current weight distribution according to the maximum working capacity, changes the displacement distribution result of the fracturing pump group, and makes the displacement distribution of the fracturing pump take into account the power grid capacity factor, making the output of each power grid more reasonable.

[0087] First, according to the correspondence between the fracturing pump and the grid line, set the fracturing pump under each grid. And set the maximum capacity of each grid according to the grid capacity allocated by the power supply bureau. Assume that the fracturing system is connected to 4 grids in total (grid line I maximum capacity P1 Limit , Maximum capacity of grid incoming line II P2 Limit , Grid incoming line III maximum capacity P3 Limit and the maximum capacity of the grid line IV P4 Limit ), in the program, real-time statistics of 4-way power grid (power grid line I real-time power P1 RealTime , Grid incoming line II real-time power P2 RealTime , Grid incoming line III real-time power P3 RealTime and grid incoming line IV real-time power P4 RealTime ), divide the real-time power by the maximum capacity of each grid to obtain the real-time load rate of each grid (grid inlet line I real-time load rate P1 LoadRate , Real-time load rate of grid incoming line II P2 LoadRate , real-time load rate of grid line III P3 LoadRate And the grid incoming line IV real-time load rate P4 LoadRate ).

[0088] Then, based on the number of fracturing pumps deployed on each power grid and the output of the fracturing pumps under their control after deployment, the load factor of each power grid is determined to determine whether it can be adjusted upward or downward. When the operating displacement of the fracturing pumps deployed on a power grid is greater than 0, the power grid can adjust its load downward. When the operating displacement of the fracturing pumps deployed on a power grid is less than the maximum operating capacity, the power grid can adjust its load upward. When no fracturing pumps are deployed on a power grid, the power grid cannot adjust its load upward or downward. This judgment determines the power grid's adjustable capacity (Power_up[n] = 1 for power grid line n, Power_up[n] = 0 for power grid line n, Power_down[n] = 1 for power grid line n, and Power_down[n] = 0 for power grid line n).

[0089] When the control system detects that the load rate of the power grid that can be lowered exceeds the first threshold (85%), if the load rate of the remaining power grids differs by more than the second threshold (5%) and meets the conditions for upward adjustment, the control system will prioritize transferring the load rate to a power grid with the largest load rate difference and the capacity that can be increased. The power grid coefficient adjustment speed is 1% every 2 seconds. The fracturing pump obtains the power grid weight coefficient C of the power grid where it is located. n电网 (For example: Pump No. 3 belongs to incoming network 1, then C 3电网 =C 进线1电网 ), add the grid coefficient to the working capacity weight, intervene in the current capacity weight method, realize one-to-one displacement transfer between grids, and achieve the automatic balancing effect of grid load rate. The calculation formula is as follows:

[0090] Among them, V n_set The displacement of a single fracturing pump in the fracturing pump group is V after the power grid that needs to reduce the displacement transfers the grid weight coefficient to the power grid with the lowest load rate. 泵组set Indicates the total displacement of the fracturing pump group, V n大 Indicates the maximum working capacity weight coefficient of the fracturing pump, C n电网 Indicates the grid weight coefficient of the power grid where the fracturing pump is located.

[0091] Finally, when the construction pressure during the fracturing operation increases and the load rate of a certain power grid exceeds the third threshold (95%), the power grid will automatically reduce the fracturing pump output coefficient under the power grid until the load rate of the power grid is less than the fourth threshold (90%). Then, the power grid regulation is reset, and the fracturing pump finally executes the pump group control displacement V n_get Reduce, reduce the actual displacement of the fracturing pump and adjust the load rate to avoid the power grid tripping and causing construction interruption. The calculation formula is as follows: V n_get =V n_set×V n_电网_C o

[0092] Among them, V n_get It indicates the controlled displacement of the fracturing pump group executed by the fracturing pump after reducing the fracturing pump output coefficient under the power grid, V n_set The displacement of a single fracturing pump in the fracturing pump group is V after the power grid that needs to reduce the displacement transfers the grid weight coefficient to the power grid with the lowest load rate. n_电网_Co Indicates the output coefficient of the power grid where the fracturing pump is located.

[0093] In summary, the present invention combines the capabilities of the fracturing pumps under each power grid, calculates the weight factor of the power grid, and weights it to the existing fracturing pump group distribution method, so that the distribution method of the fracturing pump group control displacement is based on both the pump condition capacity and the power grid load rate, and ultimately realizes automatic adjustment of the power grid load, so that the load of each power grid is reasonably distributed, and when the power grid load has the risk of jumping the power grid, the load is actively reduced to ensure the stability of the power grid.

[0094] Example 2

[0095] As shown in FIG2 , the present invention provides a power grid regulation system for executing the power grid regulation method for controlling a fracturing pump group described in Example 1, comprising:

[0096] The first processing module is used to set the maximum capacity of the fracturing pump and the power grid under each power grid inlet line;

[0097] The second processing module is used to start the fracturing pump group, turn on the automatic balancing and self-protection functions of the power grid, and initialize the power grid weight coefficient and the fracturing pump output coefficient;

[0098] The third processing module is used to monitor whether the displacement of each grid incoming line can be adjusted up or down;

[0099] a fourth processing module, configured to execute an automatic grid balancing function based on the monitoring results and the grid weight coefficient, and to execute a grid self-protection function based on the monitoring results and the fracturing pump output coefficient;

[0100] The fifth processing module is used to adjust the working displacement of the fracturing pumps under each power grid incoming line according to the execution result, and complete the regulation of the power grid in the fracturing pump group control.

[0101] The grid regulation system provided in the embodiment shown in FIG2 can execute the technical solution shown in the grid regulation method in the above method embodiment 1. Its implementation principle and beneficial effects are similar and will not be repeated here.

[0102] In this embodiment, the present application can divide functional units according to the power grid regulation method. For example, each function can be divided into separate functional units, or two or more functions can be integrated into a single processing unit. The above-mentioned integrated units can be implemented in the form of hardware or software functional units. It should be noted that the division of units in the present invention is illustrative and only a logical division. In actual implementation, other division methods may be used.

[0103] In this embodiment, the power grid regulation system includes hardware structures and / or software modules for executing various functions in order to realize the principles and beneficial effects of the power grid regulation method. It should be readily appreciated by those skilled in the art that, in combination with the various schematic units and algorithm steps described in the embodiments disclosed herein, the present invention can be implemented in the form of hardware and / or a combination of hardware and computer software. Whether a function is executed in a hardware- or computer software-driven manner depends on the specific application and design constraints of the technical solution. Different methods can be used for each specific application to implement the described function, but such implementation should not be considered to be beyond the scope of this application.

[0104] The present invention combines the capabilities of the fracturing pumps under each power grid, calculates the weight factor of the power grid, and weights it to the existing fracturing pump group distribution method, so that the distribution method of the fracturing pump group control displacement is based on both the pump condition capacity and the power grid load rate, and ultimately realizes automatic adjustment of the power grid load, so that the load of each power grid is reasonably distributed, and when the power grid load has the risk of jumping the power grid, the load is actively reduced to ensure the stability of the power grid.

[0105] Those skilled in the art will appreciate that the embodiments described herein are intended to help readers understand the principles of the present invention, and it should be understood that the scope of protection of the present invention is not limited to such specific descriptions and embodiments. Those skilled in the art can make various other specific variations and combinations based on the technical teachings disclosed in the present invention without departing from the essence of the present invention, and such variations and combinations are still within the scope of protection of the present invention.

Claims

1. A power grid regulation method used in the control of a fracturing pump group, characterized in that: The following steps are involved: S1. Set the maximum capacity of the fracturing pump and the power grid under each power grid inlet line; S2, start the fracturing pump group, turn on the automatic balancing and self-protection functions of the power grid, and initialize the power grid weight coefficient and the fracturing pump output coefficient; S3, monitor whether the incoming lines of each power grid can adjust the displacement up and down; S4. Execute the automatic balancing function of the power grid according to the monitoring results and the power grid weight coefficient, and execute the self-protection function of the power grid according to the monitoring results and the fracturing pump output coefficient; S5. According to the execution result, the working displacement of the fracturing pumps under the inlet lines of each power grid is adjusted to complete the regulation of the power grid in the control of the fracturing pump group.

2. The power grid regulation method used in the control of a fracturing pump group according to claim 1 is characterized in that: The S3 comprises the following steps: S301, monitoring the power grid where the displacement of the fracturing pump group can be adjusted upward; S302, monitoring the power grid where the displacement of the fracturing pump group can be adjusted downward; S303, monitoring the real-time load rate of the power grid that can reduce the discharge capacity.

3. The power grid regulation method used in the control of a fracturing pump group according to claim 2 is characterized in that: The S301 includes the following steps: A1. Scan the current power grid from the first fracturing pump to the last fracturing pump; A2. When the fracturing pump belongs to the current power grid, determine whether the fracturing pump is in the fracturing pump group control mode and whether the operating displacement of the fracturing pump is less than the maximum working capacity. If it is in the fracturing pump group control mode and the operating displacement of the fracturing pump is less than the maximum working capacity, the value of Power_up[N] is assigned to 1, indicating that the current power grid incoming line can increase the displacement. Otherwise, the value of Power_up[N] is assigned to 0, indicating that the current power grid incoming line cannot increase the displacement. Among them, Power_up[N] indicates whether the power grid incoming line N can be increased. Displacement, when the value is 0, it means that the displacement cannot be increased, when the value is 1, it means that the displacement can be increased, and N represents the number of the power grid incoming line; A3, determine whether all power grids have been scanned, if so, then according to the judgment result of A2, obtain the power grid whose displacement can be increased under the control of the fracturing pump group, otherwise, return to A1 until all power grids are scanned.

4. The power grid regulation method used in the control of a fracturing pump group according to claim 2 is characterized in that: The S302 includes the following steps: B1. Scan the current power grid from the first fracturing pump to the last fracturing pump; B2. When the fracturing pump belongs to the current power grid, determine whether the fracturing pump is in the fracturing pump group control mode and whether the operating displacement of the fracturing pump is greater than 0. If it is in the fracturing pump group control mode and the operating displacement of the fracturing pump is greater than 0, assign the value of Power_down[N] to 1, indicating that the current power grid can reduce the displacement. Otherwise, assign the value of Power_down[N] to 0, indicating that the current power grid cannot reduce the displacement. Among them, Power_down[N] indicates whether the power grid incoming line N can reduce the displacement. A value of 0 indicates that the displacement cannot be reduced, and a value of 1 indicates that the displacement can be reduced. N indicates the number of the power grid incoming line; B3, determine whether all power grids have been scanned, if so, obtain the power grid whose displacement can be reduced under the control of the fracturing pump group according to the judgment result of B2, otherwise, return to B1 until all power grids are scanned.

5. The power grid regulation method used in the control of a fracturing pump group according to claim 2 is characterized in that: The automatic balancing of the power grid is performed in S4, including the following steps: C1. Turn on the automatic balancing function of the power grid, and initialize the power grid weight coefficient to 100% before the fracturing pump group runs to the large displacement weight allocation stage; C2. After entering the large displacement weight allocation stage, the load rate of the power grid that can adjust the displacement downward is refreshed in real time. When the load rate of the power grid that can adjust the displacement downward exceeds the critical value of the first threshold, the power grid with the lowest load rate among the power grids that can adjust the displacement upward under the control of the fracturing pump group is found; C3. When the load rate of the grid with the lowest load rate among the grids that can increase the displacement is equal to the load rate of the grid that needs to reduce the displacement When the rate difference exceeds the second threshold, the power grid that needs to reduce the discharge will transfer the power grid weight coefficient to the power grid with the lowest load rate to complete the execution of automatic power grid balancing.

6. The power grid regulation method used in the control of a fracturing pump group according to claim 5 is characterized in that: After the power grid that needs to reduce the displacement in C3 transfers the power grid weight coefficient to the power grid with the lowest load rate, the displacement expression of a single fracturing pump in the fracturing pump group is as follows: Among them, V n_set The displacement of a single fracturing pump in the fracturing pump group is V after the power grid that needs to reduce the displacement transfers the power grid weight coefficient to the power grid with the lowest load rate. 泵组set Indicates the total displacement of the fracturing pump set, V n大 Indicates the maximum working capacity weight coefficient of the fracturing pump, C n电网 Indicates the grid weight coefficient of the power grid where the fracturing pump is located.

7. The power grid regulation method used in the control of a fracturing pump group according to claim 1, characterized in that: The self-protection function of the power grid is executed in S4, which is specifically: D1. Turn on the self-protection function of the power grid and initialize the output coefficient of the fracturing pump to 100% before the fracturing pump group is operated; D2. During the operation of the fracturing pump group, when the load rate of the power grid exceeds the critical value of the third threshold, it is determined whether the power grid can reduce the displacement. If so, it proceeds to D3. Otherwise, the power grid cannot reduce the displacement, an alarm prompt is output, and the process ends; D3, setting the grid regulation enable, reducing the fracturing pump output coefficient of the grid, until the load rate of the grid is less than the fourth threshold, and then resetting the grid regulation enable; D5. After the grid regulation is enabled, if the fracturing pump output coefficient needs to be restored, in the automatic fracturing pump group mode, the fracturing pump output coefficient is restored to 100% according to the intelligent adjustment; in the manual fracturing pump group mode, the fracturing pump output coefficient is manually restored to 100% to complete the execution of the grid self-protection function.

8. The power grid regulation method used in the control of a fracturing pump group according to claim 7 is characterized in that: After reducing the output coefficient of the fracturing pump under the power grid, the expression of the fracturing pump group control displacement executed by the fracturing pump is as follows: V n_get =V n_set ×V n_电网_Co Among them, V n_get It indicates the actual controlled displacement of the fracturing pump group after reducing the fracturing pump output coefficient under the power grid, V n_set The displacement of a single fracturing pump in the fracturing pump group is V after the power grid that needs to reduce the displacement transfers the power grid weight coefficient to the power grid with the lowest load rate. n_电网_Co Indicates the output coefficient of the power grid where the fracturing pump is located.

9. A power grid regulation system for executing the power grid regulation method for controlling a fracturing pump group as claimed in any one of claims 1 to 8, characterized in that: include: The first processing module is used to set the maximum capacity of the fracturing pump and the power grid under each power grid inlet line; The second processing module is used to start the fracturing pump group, turn on the automatic balancing and self-protection functions of the power grid, and initialize the power grid weight coefficient and the fracturing pump output coefficient; The third processing module is used to monitor whether the displacement can be adjusted up or down by the incoming lines of each power grid; The fourth processing module is used to perform a grid automatic balancing function according to the monitoring results and the grid weight coefficient, and to perform a grid self-protection function according to the monitoring results and the fracturing pump output coefficient; The fifth processing module is used to adjust the working displacement of the fracturing pumps under each power grid inlet line according to the execution result, and complete the regulation of the power grid in the fracturing pump group control.

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