A method and system for managing three-phase imbalance in low-voltage distribution areas

Abstract

This invention discloses a method and system for managing three-phase imbalance in low-voltage distribution areas, relating to the field of three-phase balance control technology. It acquires three-phase operating data and three-phase current imbalance degree of the low-voltage distribution area within a preset management time. When the three-phase current imbalance degree exceeds a preset balance threshold, it determines three-phase power allocation parameters based on the three-phase operating data and a preset power allocation model. Based on these parameters, it regulates the energy equipment on each phase line of the low-voltage distribution area. This invention addresses the technical problem that while adding reactive power compensation devices to the low-voltage outgoing lines of the low-voltage distribution area can adjust the low-voltage lines, the increasing number of such devices, coupled with the increasing number of distributed photovoltaic and user energy storage systems, also increases the operating cost of the low-voltage distribution area.

Description

Technical Field

[0001] This invention relates to the field of three-phase balance control technology, and in particular to a method and system for managing three-phase imbalance in low-voltage distribution areas. Background Technology

[0002] With the increasing number of distributed photovoltaic (PV) and user energy storage systems, the three-phase imbalance in low-voltage distribution areas has become more pronounced. This imbalance can lead to abnormally high transformer temperatures, a sharp increase in distribution area losses, and increased voltage deviation, significantly impacting the safe and reliable operation of these areas. Therefore, addressing the three-phase imbalance in low-voltage distribution areas is crucial for their reliable operation.

[0003] Currently, the main method to adjust the low-voltage outgoing lines of low-voltage distribution areas is to add reactive power compensation devices on the low-voltage outgoing line side. However, with the increase in the number of distributed photovoltaic and user energy storage, the number of reactive power compensation devices also needs to be increased accordingly, which increases the operating cost of low-voltage distribution areas. Summary of the Invention

[0004] This invention provides a method and system for managing three-phase imbalance in low-voltage distribution areas. It solves the technical problem that while adding reactive power compensation devices to the low-voltage outgoing line side of the low-voltage distribution area can adjust the low-voltage outgoing line, the number of reactive power compensation devices also needs to be increased as the number of distributed photovoltaic and user energy storage increases, which increases the operating cost of the low-voltage distribution area.

[0005] The first aspect of this invention provides a method for mitigating three-phase imbalance in low-voltage distribution areas, comprising:

[0006] Acquire the three-phase operating data and three-phase current imbalance of the low-voltage distribution area within the preset treatment time;

[0007] When the three-phase current imbalance is greater than the preset balance threshold, the three-phase power distribution parameters are determined based on the three-phase operating data and the preset power distribution model.

[0008] The energy equipment on each phase line of the low-voltage distribution area is regulated according to the three-phase power distribution parameters.

[0009] Optionally, the power distribution model includes an absorption power distribution model and a supplementary power distribution model. The step of determining the three-phase power distribution parameters based on the three-phase operating data and the preset power distribution model includes:

[0010] The active power of each phase line in the three-phase operating data is averaged to obtain the three-phase average power.

[0011] The active power corresponding to each phase line is compared with the average power of the three phases to obtain the deviation power of each phase line.

[0012] Determine whether the deviation power of each phase line is less than a preset allocation threshold.

[0013] If the deviation power of the phase line is less than the allocation threshold, then the absorption allocation power parameter of the phase line is determined according to the deviation power of the phase line and the absorption power allocation model, and the absorption allocation power parameter is used as the single-phase allocation power parameter.

[0014] If the phase line deviation power is greater than or equal to the allocation threshold, then the supplementary allocation power parameter of the phase line is determined according to the phase line deviation power and the supplementary power allocation model, and the supplementary allocation power parameter is used as the single-phase allocation power parameter.

[0015] The single-phase power distribution parameters of each phase line are used as the three-phase power distribution parameters.

[0016] Optionally, the step of regulating the energy equipment on each phase line of the low-voltage distribution area according to the three-phase power distribution parameters includes:

[0017] Determine whether the single-phase power distribution parameters of each phase line in the low-voltage distribution area are absorption power distribution parameters;

[0018] When the single-phase power distribution parameter of the phase line is the absorption distribution power parameter, the energy equipment associated with the phase line is controlled to absorb power according to the single-phase power distribution parameter of the phase line.

[0019] Obtain the three-phase current imbalance of the low-voltage distribution area at the current moment;

[0020] When the three-phase current imbalance is greater than the balance threshold, it is determined whether the single-phase power distribution parameter of each phase line is a supplementary power distribution parameter.

[0021] When the single-phase power allocation parameter of the phase line is the supplementary power allocation parameter, the energy equipment associated with the phase line is controlled to supplement power according to the single-phase power allocation parameter of the phase line.

[0022] Optionally, it also includes:

[0023] When the three-phase current imbalance is less than or equal to the balance threshold, the process jumps to the step of obtaining the three-phase operating data and three-phase current imbalance of the low-voltage distribution area within a preset governance time.

[0024] Optionally, the step of determining the absorption distribution power parameters of the phase line based on the phase line deviation power and the absorption power distribution model includes:

[0025] Obtain the operating data of the energy storage devices associated with the phase line, wherein the operating data of the energy storage devices includes the operating data of each energy storage device;

[0026] Input the various operating data into the power absorption distribution model to obtain the power absorption distribution coefficient corresponding to each energy storage device;

[0027] The deviation power of the phase line is multiplied by each of the absorption power distribution coefficients to obtain the absorption and distribution power of multiple devices.

[0028] The power absorbed and distributed by all the devices is determined as the power absorption and distribution parameter of the phase line.

[0029] Optionally, the step of determining the supplementary power allocation parameters of the phase line based on the phase line deviation power and the supplementary power allocation model includes:

[0030] Obtain the operating condition data of the energy equipment associated with the phase line, wherein the operating condition data of the energy equipment includes the operating condition data of each energy equipment;

[0031] Input the various operating condition data into the supplementary power allocation model to obtain the supplementary power allocation coefficients corresponding to each of the energy devices;

[0032] The phase line deviation power is multiplied by each of the supplementary power allocation coefficients to obtain the supplementary power allocation for multiple devices.

[0033] The supplementary power allocation for all the aforementioned devices is determined as the supplementary power allocation parameter for the phase line.

[0034] A second aspect of the present invention provides a three-phase imbalance mitigation system for low-voltage distribution areas, comprising:

[0035] The data acquisition module is used to acquire the three-phase operating data and three-phase current imbalance of the low-voltage distribution area within a preset treatment time.

[0036] The analysis module is used to determine the three-phase power distribution parameters based on the three-phase operating data and the preset power distribution model when the three-phase current imbalance is greater than the preset balance threshold.

[0037] The control module is used to control the energy equipment on each phase line of the low-voltage distribution area according to the three-phase power distribution parameters.

[0038] The third aspect of the present invention provides an electronic device, including a memory and a processor, wherein the memory stores a computer program, and when the computer program is executed by the processor, the processor performs the steps of the three-phase imbalance mitigation method for low-voltage distribution areas as described in any of the preceding claims.

[0039] The fourth aspect of the present invention provides a computer-readable storage medium having a computer program stored thereon, wherein the computer program, when executed, implements the three-phase imbalance mitigation method for low-voltage distribution areas as described in any of the preceding claims.

[0040] As can be seen from the above technical solutions, the present invention has the following advantages:

[0041] This invention addresses the three-phase imbalance in low-voltage distribution areas by determining the three-phase power distribution parameters based on three-phase operating data and a preset power distribution model. Then, it regulates the energy equipment on each phase line of the low-voltage distribution area based on these parameters. By utilizing the energy equipment on each phase line, the three-phase imbalance in the low-voltage distribution area can be resolved without the need for additional equipment, thus reducing the operating costs of the low-voltage distribution area. Attached Figure Description

[0042] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0043] Figure 1 This is a flowchart illustrating the steps of a three-phase imbalance mitigation method for low-voltage distribution areas provided in Embodiment 1 of the present invention.

[0044] Figure 2 This is a flowchart illustrating the steps of a three-phase imbalance mitigation method for low-voltage distribution areas provided in Embodiment 2 of the present invention.

[0045] Figure 3 This is a schematic diagram of the low-voltage distribution area topology provided in Embodiment 2 of the present invention;

[0046] Figure 4 This is a diagram showing the three-phase imbalance curve before treatment provided in Embodiment 2 of the present invention;

[0047] Figure 5 This is a diagram of the three-phase imbalance curve after treatment provided in Embodiment 2 of the present invention;

[0048] Figure 6 This is a structural block diagram of a three-phase imbalance mitigation system for low-voltage distribution areas provided in Embodiment 3 of the present invention;

[0049] Figure 7 This is a structural block diagram of a computer device provided in Embodiment 4 of the present invention. Detailed Implementation

[0050] This invention provides a method and system for managing three-phase imbalance in low-voltage distribution areas. It addresses the technical problem that adjusting the low-voltage outgoing lines of low-voltage distribution areas by adding reactive power compensation devices on the low-voltage outgoing line side is necessary, but as the number of distributed photovoltaic and user energy storage increases, the number of reactive power compensation devices also needs to be increased accordingly, thus increasing the operating cost of low-voltage distribution areas.

[0051] To make the objectives, features, and advantages of this invention more apparent and understandable, the technical solutions of the embodiments of this invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the embodiments described below are only some embodiments of this invention, and not all embodiments. Based on the embodiments of this invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this invention.

[0052] Please see Figure 1 , Figure 1 This is a flowchart illustrating the steps of a three-phase imbalance mitigation method for low-voltage distribution areas, as provided in Embodiment 1 of the present invention.

[0053] This invention provides a method for mitigating three-phase imbalance in low-voltage distribution areas, comprising:

[0054] Step 101: Obtain the three-phase operating data and three-phase current imbalance of the low-voltage distribution area within the preset treatment time.

[0055] Three-phase operating data refers to the active power of each phase (A, B, and C) in the low-voltage distribution area within the preset treatment time.

[0056] In this embodiment of the invention, the three-phase operating data and three-phase current imbalance of the low-voltage distribution area A, B, and C are obtained within a preset treatment time.

[0057] It should be noted that the three-phase current imbalance can be obtained by collecting the three-phase current of the low-voltage distribution area using a measuring device installed in the low-voltage distribution area, selecting the maximum and minimum three-phase currents from the three-phase currents, and inputting the maximum and minimum three-phase currents into a preset three-phase current imbalance function to obtain the three-phase current imbalance corresponding to the low-voltage distribution area.

[0058] It should be noted that the three-phase current imbalance function is as follows:

[0059]

[0060] Where, ε I I represents the three-phase current imbalance. max I is the maximum three-phase current. min This is the minimum current for three phases.

[0061] Step 102: When the three-phase current imbalance is greater than the preset balance threshold, the three-phase power distribution parameters are determined based on the three-phase operating data and the preset power distribution model.

[0062] The balance threshold refers to the maximum three-phase current imbalance during normal operation of the low-voltage distribution area, and its value is 30%.

[0063] It should be noted that the power allocation model includes the absorption power allocation model and the supplementary power allocation model.

[0064] In this embodiment of the invention, it is determined whether the three-phase current imbalance is greater than 30%. When the three-phase current imbalance is greater than 30%, it is determined that the low-voltage distribution area is in a three-phase unbalanced state. The deviation active power of each phase line is calculated based on the three-phase operating data of the low-voltage distribution area. The phase line with the deviation active power less than a preset distribution threshold is determined as the absorbing phase line, and the phase line with the deviation active power greater than or equal to the distribution threshold is determined as the supplementary phase line. Based on the absorbing phase line, the supplementary phase line and the preset power distribution model, the three-phase power distribution parameters are determined. The three-phase power distribution parameters include the power distribution parameters of phases A, B and C.

[0065] Step 103: Adjust the energy equipment on each phase line of the low-voltage distribution area according to the three-phase power distribution parameters.

[0066] In this embodiment of the invention, the energy storage devices associated with the absorption phase line are controlled to absorb power according to the power allocation parameters corresponding to the absorption phase line (for example, phase A is the absorption phase line, and the energy storage devices associated with phase A are controlled to absorb power according to the power allocation parameters of phase A). The current three-phase current imbalance of the low-voltage distribution area is obtained, and it is determined whether the current three-phase current imbalance of the low-voltage distribution area exceeds the balance threshold. If the current three-phase current imbalance of the low-voltage distribution area does not exceed the balance threshold, the problem is resolved. If the current three-phase current imbalance of the low-voltage distribution area exceeds the balance threshold, the energy devices associated with the supplementary phase line are controlled to supplement power according to the power allocation parameters corresponding to the supplementary phase line (for example, phases B and C are supplementary phase lines. The energy devices associated with phase B are controlled to supplement power according to the power allocation parameters of phase B, and the energy devices associated with phase C are controlled to supplement power according to the power allocation parameters of phase C).

[0067] In this embodiment of the invention, three-phase operating data and three-phase current imbalance of a low-voltage distribution area are acquired within a preset governance time. When the three-phase current imbalance exceeds a preset balance threshold, three-phase power allocation parameters are determined based on the three-phase operating data and a preset power allocation model. Energy equipment on each phase line of the low-voltage distribution area is then regulated according to these parameters. This addresses the technical problem of increasing the cost of operating low-voltage distribution areas by adding reactive power compensation devices to the low-voltage outgoing lines, which requires an additional number of devices as the number of distributed photovoltaic and user energy storage increases. This invention, by determining the three-phase power allocation parameters based on the three-phase operating data and a preset power allocation model when the low-voltage distribution area is in a state of three-phase imbalance, and then regulating the energy equipment on each phase line of the low-voltage distribution area based on these parameters, manages the three-phase imbalance of the low-voltage distribution area using the energy equipment on each phase line. This eliminates the need for external equipment to adjust the low-voltage distribution area, reducing the operating cost of the low-voltage distribution area.

[0068] Please see Figure 2 , Figure 2 This is a flowchart illustrating the steps of a three-phase imbalance mitigation method for low-voltage distribution areas, as provided in Embodiment 2 of the present invention.

[0069] This invention provides a method for mitigating three-phase imbalance in low-voltage distribution areas, comprising:

[0070] Step 201: Obtain the three-phase operating data and three-phase current imbalance of the low-voltage distribution area within the preset treatment time.

[0071] The governance time refers to the preset time interval.

[0072] In this embodiment of the invention, the operating data of three phases A, B, and C and the three-phase current imbalance are obtained within a preset time interval.

[0073] Step 202: Average the active power of each phase line in the three-phase operating data to obtain the three-phase average power;

[0074] In this embodiment of the invention, the active power of each phase line in the three-phase operating data is input into a preset mean function to obtain the three-phase average power.

[0075] It should be noted that the mean function is as follows:

[0076]

[0077] in, This represents the average power of the three phases. The active power of phase A. For the active power of phase B, This represents the active power of phase C.

[0078] Step 203: Perform difference processing on the active power corresponding to each phase line and the three-phase average power to obtain the deviation power of each phase line;

[0079] In this embodiment of the invention, the difference between the active power corresponding to each phase line and the average power of the three phases is calculated to obtain the deviation power of each phase line.

[0080] In another embodiment, the active power and three-phase average power corresponding to each phase line are input into a preset deviation power function to obtain the deviation power of each phase line.

[0081] It should be noted that the deviation power function is as follows:

[0082]

[0083] Wherein, ΔP A Let ΔP be the phase A deviation power. B The phase B deviation power, ΔP C This represents the C-phase deviation power.

[0084] Step 204: Determine whether the deviation power of each phase line is less than the preset distribution threshold.

[0085] In this embodiment of the invention, it is determined whether the deviation power of each phase line is less than a preset allocation threshold (the allocation threshold is 0).

[0086] Step 205: If the phase line deviation power is less than the allocation threshold, then the phase line absorption allocation power parameter is determined according to the phase line deviation power and absorption power allocation model, and the absorption allocation power parameter is used as the single-phase allocation power parameter.

[0087] Furthermore, step 205 may include the following sub-steps:

[0088] S11. If the deviation power of the phase line is less than the allocation threshold, then obtain the operating data of the energy storage device associated with the phase line, wherein the operating data of the energy storage device includes the operating data of each energy storage device.

[0089] In this embodiment of the invention, when the deviation power of the phase line is less than 0, the operating data of the energy storage device associated with the phase line is obtained, wherein the operating data of the energy storage device includes the operating data of each energy storage device.

[0090] It should be noted that, for reference Figure 3 As shown, when the deviation power of phase A is less than 0, the operating data of the energy storage devices on phase A, namely the operating data of energy storage devices 61 and 36, are obtained.

[0091] S12. Input the various operating data into the power absorption distribution model to obtain the power absorption distribution coefficients corresponding to each energy storage device.

[0092] In the embodiments of the present invention, see Figure 3 As shown, the operating data of energy storage devices 61 and 36 are input into the power absorption distribution model to obtain the power absorption distribution coefficients corresponding to energy storage devices 61 and 36.

[0093] It should be noted that the absorption power allocation model is as follows:

[0094]

[0095] Where n is the number of phase-wire energy storage devices, i is the phase-wire energy storage device number, and k is the number of phase-wire energy storage devices. i Let be the power absorption distribution coefficient of the i-th energy storage device. Let i be the maximum charging power of the i-th energy storage device. The charging power of the i-th energy storage device at time t. Let be the charge value of the i-th energy storage device at time t. Let be the maximum allowable charge value for the i-th energy storage device. This is the minimum allowed charge value for the i-th energy storage device.

[0096] S13. Multiply the phase line deviation power with each absorption power distribution coefficient to obtain the absorption and distribution power of multiple devices.

[0097] In this embodiment of the invention, the multiplication between the phase line deviation power and each absorption power distribution coefficient is calculated to obtain the absorption and distribution power of multiple devices.

[0098] S14. Determine the absorption and distribution power of all equipment as the absorption and distribution power parameters of the phase line.

[0099] S15. Use the absorption distribution power parameters as the single-phase distribution power parameters.

[0100] In this embodiment of the invention, the power absorbed and distributed by all devices is determined as the power absorbed and distributed by the phase line, and then the power absorbed and distributed by the phase line is used as the power distributed by the single phase.

[0101] Step 206: If the phase line deviation power is greater than or equal to the allocation threshold, then the phase line supplementary allocation power parameter is determined according to the phase line deviation power and the supplementary power allocation model, and the supplementary allocation power parameter is used as the single-phase allocation power parameter.

[0102] Furthermore, step 206 includes the following sub-steps:

[0103] S21. If the phase line deviation power is greater than or equal to the allocation threshold, then obtain the operating condition data of the energy equipment associated with the phase line, wherein the energy equipment operating condition data includes the operating condition data of each energy equipment.

[0104] Energy equipment refers to photovoltaic equipment or energy storage equipment.

[0105] In this embodiment of the invention, when the deviation power of the phase line is greater than or equal to the allocation threshold, the operating condition data of the energy equipment associated with the phase line is obtained, wherein the operating condition data of the energy equipment includes the operating condition data of each photovoltaic device and energy storage device.

[0106] It should be noted that, for reference Figure 3 As shown, if the deviation power of phase B is greater than or equal to the allocation threshold, the operating data of energy storage device 58, photovoltaic device 59, photovoltaic device 60, photovoltaic device 66, photovoltaic device 7, energy storage device 50, photovoltaic device 42, photovoltaic device 44 and energy storage device 45 associated with phase B are obtained.

[0107] S22. Input the data of each operating condition into the supplementary power allocation model to obtain the supplementary power allocation coefficients corresponding to each energy device;

[0108] In this embodiment of the invention, the data of each operating condition are used as input to the supplementary power allocation model to obtain the supplementary power allocation coefficients corresponding to each energy device.

[0109] It should be noted that the supplementary power allocation model is as follows:

[0110]

[0111] u+v=m;

[0112] Where, k j To supplement the power allocation factor for the j-th energy device, where j is the number of the photovoltaic and energy storage device, m is the total number of photovoltaic and energy storage devices on the phase line requiring supplemental power, and P jmax Let j be the maximum discharge power of the j-th energy device. This represents the maximum discharge power of the energy storage device. Let be the discharge power of the u-th energy storage device at time t. Let be the charge value of the u-th energy storage device at time t. Let be the minimum allowable charge value for the u-th energy storage device. Let be the maximum allowable charge value for the u-th energy storage device. For the output of the vth photovoltaic unit at time t, This represents the minimum output of the v-th photovoltaic unit. Let u be the maximum output of the th photovoltaic unit, u be the number of energy storage devices, and v be the number of photovoltaic devices.

[0113] S23. Multiply the phase line deviation power with each supplementary power distribution coefficient to obtain the supplementary power distribution of multiple devices.

[0114] In this embodiment of the invention, the multiplication between the phase line deviation power and each supplementary power allocation coefficient is calculated to obtain the supplementary power allocation for multiple devices.

[0115] S24. Determine the supplementary power allocation for all equipment as the supplementary power allocation parameter for the phase line.

[0116] S25. Use the supplementary power allocation parameters as the single-phase power allocation parameters.

[0117] In this embodiment of the invention, the supplementary power allocation for all devices is determined as the full power allocation parameter of the phase line, and the supplementary power allocation parameter is used as the single-phase power allocation parameter.

[0118] Step 207: Use the single-phase power distribution parameters of each phase line as the three-phase power distribution parameters.

[0119] In this embodiment of the invention, the single-phase power distribution parameters of phase lines A, B, and C are used as the three-phase power distribution parameters.

[0120] Step 208: Adjust the energy equipment on each phase line of the low-voltage distribution area according to the three-phase power distribution parameters.

[0121] Furthermore, step 208 includes the following sub-steps:

[0122] S31. Determine whether the single-phase power distribution parameters of each phase line in the low-voltage distribution area are absorption distribution power.

[0123] In this embodiment of the invention, it is determined whether the single-phase power distribution parameters of each phase line in the low-voltage distribution area are absorption distribution power.

[0124] In another embodiment, absorption distribution power parameters are selected from the single-phase distribution power parameters of each phase line in the low-voltage distribution area.

[0125] S32. When the single-phase power distribution parameter of the phase line is the absorption distribution power parameter, the energy equipment associated with the phase line is controlled to absorb power according to the single-phase power distribution parameter of the phase line.

[0126] In this embodiment of the invention, if the single-phase power distribution parameter of the phase line is the absorption distribution power parameter, the power equipment associated with the phase line is controlled to absorb power according to the single-phase power distribution parameter of the phase line by issuing a command through the transformer terminal.

[0127] In another embodiment, a phase line with single-phase power distribution parameters as the absorption power distribution parameters is selected from the phase lines of the low-voltage distribution area and regulated. The energy storage device on the phase line is controlled to absorb power according to the single-phase power distribution parameters of the phase line by issuing a command through the distribution area terminal.

[0128] S33. Obtain the current three-phase current imbalance of the low-voltage distribution area at the current moment;

[0129] In this embodiment of the invention, the three-phase current imbalance of the low-voltage distribution area at the current moment is obtained.

[0130] In another embodiment, the three-phase current of the low-voltage distribution area at the current moment is obtained, and the three-phase current imbalance of the low-voltage distribution area at the current moment is calculated using the three-phase current.

[0131] S34. When the three-phase current imbalance is greater than the balance threshold, determine whether the single-phase power distribution parameters of each phase line are supplementary power distribution parameters.

[0132] In this embodiment of the invention, when the three-phase current imbalance is greater than 30%, it is determined that the low-voltage distribution area is still in a three-phase imbalance, and it is determined whether the single-phase power distribution parameters of each phase line are supplementary power distribution parameters.

[0133] S35. When the single-phase power distribution parameter of the phase line is the supplementary power distribution parameter, the energy equipment associated with the phase line is controlled to supplement power according to the single-phase power distribution parameter of the phase line.

[0134] In this embodiment of the invention, when the single-phase power allocation parameter of the phase line is the supplementary power allocation parameter, the energy storage device and photovoltaic device associated with the phase line are controlled by the distribution terminal to supplement the power according to the single-phase power allocation parameter of the phase line.

[0135] In another embodiment, the phase lines whose single-phase power distribution parameters are the supplementary power distribution parameters are selected from the single-phase power distribution parameters of each phase line, and the energy equipment on the phase line is instructed to supplement power according to the single-phase power distribution parameters of the phase line by the substation terminal.

[0136] Furthermore, it also includes:

[0137] When the three-phase current imbalance is less than or equal to the balance threshold, the process jumps to the step of obtaining the three-phase operating data and three-phase current imbalance of the low-voltage distribution area within the preset governance time.

[0138] In this embodiment of the invention, when the three-phase current imbalance is less than or equal to 30%, the process jumps to the step of obtaining the three-phase operating data and the three-phase current imbalance of the low-voltage distribution area within a preset treatment time.

[0139] In another embodiment, see Figure 3 As shown, real-time 24-hour power grid operation data for a certain distribution area on a certain day was obtained. In this low-voltage distribution area, phase A has 7 photovoltaic devices and 3 energy storage devices connected to it; phase B has 8 photovoltaic devices and 6 energy storage devices connected to it; and phase C has 10 photovoltaic devices and 5 energy storage devices connected to it. Three-phase imbalance was addressed according to steps 201-208, and the three-phase current imbalance in the distribution area was verified again. Figure 4-5As shown, comparing the three-phase current imbalance before and after the treatment of the low-voltage distribution area, the three-phase current imbalance of the low-voltage distribution area after treatment is stable below 30%, which meets the requirements.

[0140] In this embodiment of the invention, three-phase operating data and three-phase current imbalance of a low-voltage distribution area are acquired within a preset governance time. When the three-phase current imbalance exceeds a preset balance threshold, three-phase power allocation parameters are determined based on the three-phase operating data and a preset power allocation model. Energy equipment on each phase line of the low-voltage distribution area is then regulated according to these parameters. This addresses the technical problem of increasing the cost of operating low-voltage distribution areas by adding reactive power compensation devices to the low-voltage outgoing lines, which requires an additional number of devices as the number of distributed photovoltaic and user energy storage increases. This invention, by determining the three-phase power allocation parameters based on the three-phase operating data and a preset power allocation model when the low-voltage distribution area is in a state of three-phase imbalance, and then regulating the energy equipment on each phase line of the low-voltage distribution area based on these parameters, manages the three-phase imbalance of the low-voltage distribution area using the energy equipment on each phase line. This eliminates the need for external equipment to adjust the low-voltage distribution area, reducing the operating cost of the low-voltage distribution area.

[0141] Please see Figure 6 , Figure 6 This is a structural block diagram of a three-phase imbalance control method system for low-voltage distribution areas provided in Embodiment 3 of the present invention.

[0142] This invention provides a three-phase imbalance mitigation system for low-voltage distribution areas, comprising:

[0143] The acquisition module 301 is used to acquire the three-phase operating data and three-phase current imbalance of the low-voltage distribution area within a preset treatment time.

[0144] Analysis module 302 is used to determine the three-phase power distribution parameters based on the three-phase operating data and the preset power distribution model when the three-phase current imbalance is greater than the preset balance threshold.

[0145] The control module 303 is used to control the energy equipment on each phase line of the low-voltage distribution area according to the three-phase power distribution parameters.

[0146] Furthermore, the analysis module 302 includes:

[0147] The averaging submodule is used to average the active power of each phase line in the three-phase operating data to obtain the three-phase average power.

[0148] The difference submodule is used to perform difference processing on the active power corresponding to each phase line and the three-phase average power to obtain the deviation power of each phase line;

[0149] The first analysis submodule is used to determine whether the deviation power of each phase line is less than the preset allocation threshold.

[0150] The second analysis submodule is used to determine the absorption and distribution power parameters of the phase line based on the phase line deviation power and absorption power distribution model if the phase line deviation power is less than the distribution threshold, and to use the absorption and distribution power parameters as the single-phase distribution power parameters.

[0151] The third analysis submodule is used to determine the supplementary allocation power parameters of the phase line based on the phase line deviation power and the supplementary power allocation model if the phase line deviation power is greater than or equal to the allocation threshold, and to use the supplementary allocation power parameters as the single-phase allocation power parameters.

[0152] Select a submodule to use the single-phase power distribution parameters of each phase line as the three-phase power distribution parameters.

[0153] Furthermore, the control module 303 includes:

[0154] The fourth analysis submodule is used to determine whether the single-phase power distribution parameters of each phase line in the low-voltage distribution area are absorption power distribution parameters.

[0155] When the single-phase power distribution parameter of the phase line is the absorption distribution power parameter, the energy equipment associated with the phase line is controlled to absorb power according to the single-phase power distribution parameter of the phase line.

[0156] The data acquisition submodule is used to obtain the three-phase current imbalance of the low-voltage distribution area at the current moment;

[0157] The first control submodule is used to determine whether the single-phase power distribution parameters of each phase line are supplementary power distribution parameters when the three-phase current imbalance is greater than the balance threshold.

[0158] The second control submodule is used to control the energy equipment associated with the phase line to supplement power according to the single-phase power distribution parameter of the phase line when the single-phase power distribution parameter of the phase line is the supplementary power distribution parameter.

[0159] Furthermore, it also includes:

[0160] The rotor jumper module is used to jump to the step of obtaining the three-phase operating data and three-phase current imbalance of the low-voltage distribution area within a preset treatment time when the three-phase current imbalance is less than or equal to the balance threshold.

[0161] Furthermore, the second analysis submodule includes:

[0162] The first acquisition unit is used to acquire the operating data of the energy storage devices associated with the phase line, wherein the operating data of the energy storage devices includes the operating data of each energy storage device;

[0163] The first analysis unit is used to input various operating data into the power absorption distribution model to obtain the power absorption distribution coefficients corresponding to each energy storage device.

[0164] The phase line deviation power is multiplied by each absorption power distribution coefficient to obtain the absorption and distribution power of multiple devices.

[0165] The power absorbed and distributed by all equipment is determined as the power absorbed and distributed by the phase line.

[0166] Furthermore, the third analysis submodule includes:

[0167] The second acquisition unit is used to acquire the operating condition data of the energy equipment associated with the phase line, wherein the operating condition data of the energy equipment includes the operating condition data of each energy equipment.

[0168] The second analysis unit is used to input the data of each operating condition into the supplementary power allocation model to obtain the supplementary power allocation coefficients corresponding to each energy device.

[0169] The phase line deviation power is multiplied by each supplementary power distribution coefficient to obtain the supplementary power distribution for multiple devices.

[0170] The supplementary power allocation for all equipment is determined as the supplementary power allocation parameter for the phase line.

[0171] Please see Figure 7 , Figure 7 This is a structural block diagram of a computer device provided in Embodiment 4 of the present invention.

[0172] An electronic device according to an embodiment of the present invention includes: a memory 401 and a processor 402. The memory 402 stores a computer program. When the computer program is executed by the processor 402, the processor 402 performs the three-phase imbalance control method for low-voltage distribution areas as described in any of the above embodiments.

[0173] Memory 401 may be an electronic memory such as flash memory, EEPROM (Electrically Erasable Programmable Read-Only Memory), EPROM, hard disk, or ROM. Memory 401 has storage space 403 for program code 413 for performing any of the method steps described above. For example, storage space 403 for program code may include individual program codes 413 for implementing the various steps in the methods described above. This program code can be read from or written to one or more computer program products. These computer program products include program code carriers such as hard disks, CDs, memory cards, or floppy disks. The program code may be compressed, for example, in a suitable form. When run by a computing processing device, this code causes the computing processing device to perform the various steps in the methods described above. This program code can be read from or written to one or more computer program products. These computer program products include program code carriers such as hard disks, CDs, memory cards, or floppy disks. The program code may be compressed, for example, in a suitable form. When these codes are run by a computing device, the computing device causes the computing device to perform the various steps in the three-phase imbalance control method for low-voltage distribution areas described above.

[0174] Embodiment 5 of the present invention also provides a computer-readable storage medium storing a computer program thereon, which, when executed by a processor, implements the three-phase imbalance mitigation method for low-voltage distribution areas as described in any of the above embodiments.

[0175] Embodiment 6 of the present invention also provides a computer program product, which includes a computer program stored on a non-transitory computer-readable storage medium. The computer program includes program instructions, wherein when the program instructions are executed by a computer, the computer performs the low-voltage distribution area three-phase imbalance mitigation method as described in any of the above embodiments.

[0176] Those skilled in the art will clearly understand that, for the sake of convenience and brevity, the specific working processes of the systems, devices, and units described above can be referred to the corresponding processes in the foregoing method embodiments, and will not be repeated here.

[0177] In the several embodiments provided in this application, it should be understood that the disclosed systems, apparatuses, and methods can be implemented in other ways. For example, the apparatus embodiments described above are merely illustrative; for instance, the division of units is only a logical functional division, and in actual implementation, there may be other division methods. For example, multiple units or components may be combined or integrated into another system, or some features may be ignored or not executed. Furthermore, the coupling or direct coupling or communication connection shown or discussed may be through some interfaces, or indirect coupling or communication connection between apparatuses or units, and may be electrical, mechanical, or other forms.

[0178] The units described as separate components may or may not be physically separate. The components shown as units may or may not be physical units; that is, they may be located in one place or distributed across multiple network units. Some or all of the units can be selected to achieve the purpose of this embodiment according to actual needs.

[0179] Furthermore, the functional units in the various embodiments of the present invention can be integrated into one processing unit, or each unit can exist physically separately, or two or more units can be integrated into one unit. The integrated unit can be implemented in hardware or as a software functional unit.

[0180] If the integrated unit is implemented as a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present invention, in essence, or the part that contributes to the prior art, or all or part of the technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute all or part of the steps of the methods of the various embodiments of the present invention. The aforementioned storage medium includes various media capable of storing program code, such as USB flash drives, portable hard drives, read-only memory (ROM), random access memory (RAM), magnetic disks, or optical disks.

[0181] The above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit it. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A method for managing three-phase imbalance in low-voltage distribution areas, characterized in that, include: Acquire the three-phase operating data and three-phase current imbalance of the low-voltage distribution area within the preset treatment time; When the three-phase current imbalance is greater than the preset balance threshold, the three-phase power distribution parameters are determined based on the three-phase operating data and the preset power distribution model. The energy equipment on each phase line of the low-voltage distribution area is regulated according to the three-phase power distribution parameters. The power allocation model includes an absorption power allocation model and a supplementary power allocation model. The step of determining the three-phase power allocation parameters based on the three-phase operating data and the preset power allocation model includes: The active power of each phase line in the three-phase operating data is averaged to obtain the three-phase average power. The active power corresponding to each phase line is compared with the average power of the three phases to obtain the deviation power of each phase line. Determine whether the deviation power of each phase line is less than a preset allocation threshold. If the deviation power of the phase line is less than the allocation threshold, then the absorption allocation power parameter of the phase line is determined according to the deviation power of the phase line and the absorption power allocation model, and the absorption allocation power parameter is used as the single-phase allocation power parameter. If the phase line deviation power is greater than or equal to the allocation threshold, then the supplementary allocation power parameter of the phase line is determined according to the phase line deviation power and the supplementary power allocation model, and the supplementary allocation power parameter is used as the single-phase allocation power parameter. The single-phase power distribution parameters of each phase line are used as the three-phase power distribution parameters. The power absorption distribution model is as follows: ； ； in, This refers to the number of phase-line energy storage devices. This is the serial number for the phase-line energy storage device. For the first The power distribution coefficient of an energy storage device For the first The maximum charging power of each energy storage device For the first The charging power of an energy storage device at time t. For the first The charge value of an energy storage device at time t. For the first The maximum allowable charge of an energy storage device. For the first The minimum charge allowed for an energy storage device; The supplementary power allocation model is as follows: ； ； ； ； in, For the first Supplemental power allocation factor for each energy device Numbering of photovoltaic and energy storage devices This refers to the total number of photovoltaic and energy storage devices on the phase lines that require additional power. For the first Maximum discharge power of each energy device This represents the maximum discharge power of the energy storage device. Let be the discharge power of the u-th energy storage device at time t. Let be the charge value of the u-th energy storage device at time t. Let be the minimum allowable charge value for the u-th energy storage device. Let be the maximum allowable charge value for the u-th energy storage device. For the first The output of Taiwan's photovoltaic system at that moment. For the first Minimum output of Taiwan's solar power This represents the maximum output of the first photovoltaic unit. For the number of energy storage devices, This refers to the number of photovoltaic devices.

2. The method for managing three-phase imbalance in low-voltage distribution areas according to claim 1, characterized in that, The step of regulating the energy equipment on each phase line of the low-voltage distribution area according to the three-phase power distribution parameters includes: Determine whether the single-phase power distribution parameters of each phase line in the low-voltage distribution area are absorption power distribution parameters; When the single-phase power distribution parameter of the phase line is the absorption distribution power parameter, the energy equipment associated with the phase line is controlled to absorb power according to the single-phase power distribution parameter of the phase line. Obtain the three-phase current imbalance of the low-voltage distribution area at the current moment; When the three-phase current imbalance is greater than the balance threshold, it is determined whether the single-phase power distribution parameter of each phase line is a supplementary power distribution parameter. When the single-phase power allocation parameter of the phase line is the supplementary power allocation parameter, the energy equipment associated with the phase line is controlled to supplement power according to the single-phase power allocation parameter of the phase line.

3. The method for managing three-phase imbalance in low-voltage distribution areas according to claim 1, characterized in that, Also includes: When the three-phase current imbalance is less than or equal to the balance threshold, the process jumps to the step of obtaining the three-phase operating data and three-phase current imbalance of the low-voltage distribution area within a preset governance time.

4. The method for managing three-phase imbalance in low-voltage distribution areas according to claim 1, characterized in that, The step of determining the absorption distribution power parameters of the phase line based on the phase line deviation power and the absorption power distribution model includes: Obtain the operating data of the energy storage devices associated with the phase line, wherein the operating data of the energy storage devices includes the operating data of each energy storage device; Input the various operating data into the power absorption distribution model to obtain the power absorption distribution coefficient corresponding to each energy storage device; The deviation power of the phase line is multiplied by each of the absorption power distribution coefficients to obtain the absorption and distribution power of multiple devices. The power absorbed and distributed by all the devices is determined as the power absorption and distribution parameter of the phase line.

5. The method for managing three-phase imbalance in low-voltage distribution areas according to claim 1, characterized in that, The step of determining the supplementary power allocation parameters of the phase line based on the phase line deviation power and the supplementary power allocation model includes: Obtain the operating condition data of energy equipment associated with the phase line, wherein the operating condition data of the energy equipment includes the operating condition data of each energy equipment; Input the various operating condition data into the supplementary power allocation model to obtain the supplementary power allocation coefficients corresponding to each of the energy devices; The phase line deviation power is multiplied by each of the supplementary power allocation coefficients to obtain the supplementary power allocation for multiple devices. The supplementary power allocation for all the aforementioned devices is determined as the supplementary power allocation parameter for the phase line.

6. A three-phase imbalance mitigation system for low-voltage distribution areas, based on the three-phase imbalance mitigation method for low-voltage distribution areas as described in any one of claims 1-5, characterized in that, include: The data acquisition module is used to acquire the three-phase operating data and three-phase current imbalance of the low-voltage distribution area within a preset treatment time. The analysis module is used to determine the three-phase power distribution parameters based on the three-phase operating data and the preset power distribution model when the three-phase current imbalance is greater than the preset balance threshold. The control module is used to control the energy equipment on each phase line of the low-voltage distribution area according to the three-phase power distribution parameters.

7. An electronic device, characterized in that, The device includes a memory and a processor. The memory stores a computer program, which, when executed by the processor, causes the processor to perform the steps of the three-phase imbalance mitigation method for low-voltage distribution areas as described in any one of claims 1-5.

8. A computer-readable storage medium having a computer program stored thereon, characterized in that, When the computer program is executed, it implements the three-phase imbalance control method for low-voltage distribution areas as described in any one of claims 1-5.

9. A computer program product, characterized in that, The computer program product includes a computer program stored on a non-transitory computer-readable storage medium, the computer program including program instructions, wherein when the program instructions are executed by a computer, the computer performs the low-voltage distribution area three-phase imbalance treatment method as described in any one of claims 1-5.

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