Multi-branch flexible voltage regulating device of power distribution network, control method, equipment and medium

Abstract

This invention relates to a multi-branch flexible voltage regulating device, control method, equipment, and medium for power distribution networks. The multi-branch flexible voltage regulating device includes a multi-port transformer with an integrated voltage regulating mechanism, an incoming circuit breaker, and multiple branch circuit breakers. The incoming circuit breaker is connected to the input port of the multi-port transformer, and each branch circuit breaker is connected to the output port of the multi-port transformer. The input ports of the multi-port transformer are connected to the external power distribution network, and each output port of the multi-port transformer is connected to an external branch load. By connecting multiple branch loads through the multi-port transformer with the integrated voltage regulating mechanism, the voltage of multiple branch loads can be automatically, rapidly, and independently regulated differentiatedly by adjusting the operating state of the voltage regulating mechanism to meet the voltage regulation needs of different branch loads, effectively suppressing voltage fluctuations and significantly improving power quality.

Description

Technical Field

[0001] This invention relates to the field of power system technology, specifically to a multi-branch flexible voltage regulating device, control method, equipment, and medium for a power distribution network. Background Technology

[0002] With the continuous integration of high-proportion photovoltaic (PV) power and the increase in electricity demand, the power flow of active distribution networks experiences random bidirectional fluctuations and enhanced interaction between power sources, grids, loads, and storage. The output of distributed power sources such as PV and wind power is "intermittent and time-sequential," resulting in significant differences in the operating characteristics of different feeders. However, existing voltage regulation technology is "static and one-size-fits-all," focusing only on centralized regulation of the bus voltage of substations. It cannot adapt to these "dynamic and differentiated" operating requirements, leading to voltage exceeding limits, deterioration of power quality, and hindering the construction of new power systems. At the same time, conventional on-load tap changers have long tap adjustment times and cannot withstand large overload currents. Furthermore, when a conventional on-load tap changer fails, all the load it carries will be shut down and transferred to other transformers, resulting in a load outage during this transfer process. Summary of the Invention

[0003] To address the problem that existing voltage regulating devices, which centrally regulate bus voltage, fail to adapt to the "dynamic and differentiated" operational requirements, this invention proposes a multi-branch flexible voltage regulating device, control method, equipment, and medium for power distribution networks.

[0004] In a first aspect, the present invention provides a multi-branch flexible voltage regulating device for a power distribution network, the multi-branch flexible voltage regulating device comprising: a multi-port transformer with an integrated voltage regulating mechanism, an incoming circuit breaker, and multiple branch circuit breakers; The incoming circuit breaker is connected to the input port of the multi-port transformer, and each of the branch circuit breakers is connected to the output port of the multi-port transformer. The input port of the multi-port transformer is connected to the external power distribution network, and each output port of the multi-port transformer is connected to an external branch load.

[0005] Optionally, the multi-port transformer includes a multi-phase transformer module; Each phase of the transformer module includes: an input port, multiple output ports, a high-voltage winding, multiple secondary voltage regulating windings, and multiple voltage regulating mechanisms; the first end of the high-voltage winding is connected to the input port and each secondary voltage regulating winding, each secondary voltage regulating winding is connected to its corresponding voltage regulating mechanism, and each voltage regulating mechanism is also connected to its corresponding output port; In the multiphase transformer module, the ends of the high-voltage windings are interconnected to form a neutral point.

[0006] Optionally, the high-voltage winding, the plurality of secondary voltage regulating windings, and the plurality of voltage regulating mechanisms are concentrated in one oil tank of the multi-port transformer.

[0007] Optionally, each of the secondary voltage regulating windings includes a central tap and multiple taps; Each of the secondary voltage regulating windings is connected to its corresponding voltage regulating mechanism through the plurality of taps, and each of the voltage regulating windings is connected to the high voltage winding through the central shaft tap.

[0008] Optionally, the pressure regulating mechanism includes an intermediate tap and multiple taps; Each of the taps is connected to its corresponding tap, and the intermediate tap is connected to the high-voltage winding via the central shaft tap.

[0009] Optionally, the plurality of voltage regulating mechanisms are self-resetting magnetically controlled on-load tap changers.

[0010] Optionally, the multi-branch flexible voltage regulating device further includes: multiple bypass circuit breakers; The input port of each phase transformer module is connected to its corresponding output port through the multiple bypass circuit breakers.

[0011] Optionally, the multi-branch flexible voltage regulating device further includes: an energy harvesting winding and a control module; The energy harvesting winding supplies power to the control module and the voltage regulating mechanism respectively; The control module is used to obtain a gear adjustment command based on the voltage of multiple branches in the multi-branch flexible voltage regulating device, and based on the gear adjustment command, control the voltage regulating mechanism in the multi-port transformer to adjust the gear, thereby realizing the dynamic adjustment of the voltage of each branch.

[0012] Optionally, the multi-branch flexible voltage regulating device further includes: multiple current sensors and multiple voltage transformers; The plurality of current sensors and the plurality of voltage transformers are respectively installed at the input port and each output port of the multi-port transformer.

[0013] A second aspect of the present invention also provides a control method for a multi-branch flexible voltage regulating device, the control method comprising: Based on the voltage of multiple branches in the multi-branch flexible voltage regulating device, the adjustment command is obtained; Based on the adjustment command, the voltage adjustment mechanism in the multi-branch flexible voltage regulating device is adjusted to achieve dynamic adjustment of the voltage of each branch. The multi-branch flexible voltage regulating device mentioned above is the multi-branch flexible voltage regulating device described in the first aspect of the present invention.

[0014] Optionally, adjusting the voltage regulating mechanism in the multi-branch flexible voltage regulating device based on the adjustment command to achieve dynamic adjustment of the voltage of each branch includes: When the gear shifting command is an upshift command, the upshift relay is controlled to operate based on the upshift command, and a positive DC voltage is applied to the electromagnetic coil in the voltage regulating mechanism to realize the upshift control of the voltage regulating mechanism in the multi-branch flexible voltage regulating device.

[0015] Optionally, adjusting the voltage regulating mechanism in the multi-branch flexible voltage regulating device based on the adjustment command to achieve dynamic adjustment of the voltage of each branch includes: When the gear shifting command is a downshift command, based on the downshift command, the downshift relay is controlled to operate, and a reverse DC voltage is applied to the electromagnetic coil in the voltage regulating mechanism to realize the downshift control of the voltage regulating mechanism in the multi-branch flexible voltage regulating device.

[0016] Optionally, obtaining the adjustment command based on the voltages of multiple branches in the multi-branch flexible voltage regulating device includes: When the voltage of any branch exceeds the upper limit of the normal voltage range, a downshift command is issued to the voltage regulating mechanism corresponding to the branch voltage exceeding the upper limit of the voltage range. When the voltage of any branch is lower than the lower limit of the normal voltage range, an upshift command is issued to the voltage regulating mechanism corresponding to the branch voltage being lower than the lower limit.

[0017] Optionally, before obtaining the adjustment command based on the multiple branch voltages in the multi-branch flexible voltage regulating device, the method further includes: It is determined that the incoming circuit breaker and multiple branch circuit breakers in the multi-branch flexible voltage regulating device are all in the open state; Determine that the voltage regulating mechanism in the multi-branch flexible voltage regulating device is in the 0 position; Control the incoming line circuit breaker and the multiple branch circuit breakers to close sequentially, and control the bypass circuit breaker corresponding to each branch load to open. Control the voltage regulating mechanism in the multi-branch flexible voltage regulating device so that each branch load is powered through each output port of the multi-branch flexible voltage regulating device.

[0018] Optionally, after controlling the voltage regulating mechanism in the multi-branch flexible voltage regulating device based on the gear shift command, the method further includes: The voltage regulating mechanism in the multi-branch flexible voltage regulating device is controlled to be in the 0 position; Control the closing of the bypass circuit breaker corresponding to each branch load, and control the opening of the incoming circuit breaker and the multiple branch circuit breakers, so that each branch load is powered through its respective bypass circuit breaker.

[0019] A third aspect of the present invention also provides a computing device, comprising: one or more processors; A processor is used to execute one or more programs; When the one or more programs are executed by the one or more processors, a control method for a multi-branch flexible voltage regulating device as described in the first aspect of the present invention is implemented.

[0020] A fourth aspect of the present invention also provides a computer-readable storage medium having a computer program stored thereon, wherein when the computer program is executed, it implements the control method of the multi-branch flexible voltage regulating device described in the first aspect of the present invention.

[0021] Compared with the prior art, the beneficial effects of the present invention are as follows: This invention provides a multi-branch flexible voltage regulating device, control method, equipment, and medium for a power distribution network. The multi-branch flexible voltage regulating device includes a multi-port transformer with an integrated voltage regulating mechanism, an incoming circuit breaker, and multiple branch circuit breakers. The incoming circuit breaker is connected to the input port of the multi-port transformer, and each branch circuit breaker is connected to the output port of the multi-port transformer. Each input port of the multi-port transformer is connected to an external power distribution network, and each output port is connected to an external branch load. By connecting multiple branch loads through the multi-port transformer with the integrated voltage regulating mechanism, the voltage of multiple branch loads can be automatically, rapidly, and independently adjusted according to their voltage regulation needs by regulating the operating state of the voltage regulating mechanism. This effectively suppresses voltage fluctuations and significantly improves power quality. Attached Figure Description

[0022] Figure 1 A schematic diagram of a multi-branch flexible voltage regulating device for a power distribution network provided by the present invention; Figure 2 A schematic diagram of the electromagnetic drive structure of a self-resetting magnetically controlled on-load tap changer provided by the present invention; Figure 3 A schematic diagram of single-phase wiring of a multi-branch flexible voltage regulating device for a power distribution network provided by the present invention; Figure 4 A schematic diagram of the internal wiring of a multi-port transformer in a power distribution network provided by the present invention; Figure 5 A flowchart of a control method for a multi-branch flexible voltage regulating device provided by the present invention; Figure 6 A flowchart of the upshifting process of a multi-branch flexible voltage regulating device provided by the present invention; Figure 7 A flowchart of the downshifting process of a multi-branch flexible voltage regulating device provided by the present invention; Figure 8A control logic diagram of a multi-branch flexible voltage regulating device provided by the present invention; Figure 9 A block diagram of a computer device provided by the present invention. Detailed Implementation

[0023] Example 1: Figure 1 This is a schematic diagram of a multi-branch flexible voltage regulating device for a power distribution network provided by the present invention, as shown below. Figure 1 As shown, the multi-branch flexible voltage regulating device includes: a multi-port transformer with an integrated voltage regulating mechanism, an incoming line circuit breaker, and multiple branch circuit breakers; the incoming line circuit breaker is connected to the input port of the multi-port transformer, and each branch circuit breaker is connected to the output port of the multi-port transformer; the input ports of the multi-port transformer are respectively connected to the external power distribution network, and each output port of the multi-port transformer is respectively connected to an external branch load.

[0024] It should be noted that, in response to the shortcomings of existing voltage regulation technologies, which are "static and one-size-fits-all" and only centrally regulate the bus voltage of substations, this invention provides a multi-branch flexible voltage regulation device for distribution networks. It can automatically, quickly, and independently regulate the voltage of n connected branches according to the voltage regulation needs of different branches, effectively suppressing voltage fluctuations and significantly improving power quality.

[0025] Optionally, the multi-port transformer includes a multi-phase transformer module; each phase of the transformer module includes: an input port, multiple output ports, a high-voltage winding, multiple secondary voltage regulating windings, and multiple voltage regulating mechanisms; the beginning of the high-voltage winding is connected to the input port and each secondary voltage regulating winding, each secondary voltage regulating winding is connected to its corresponding voltage regulating mechanism, and each voltage regulating mechanism is also connected to its corresponding output port; the ends of the high-voltage windings in the multi-phase transformer module are interconnected to form a neutral point.

[0026] The high-voltage winding, the multiple secondary-side voltage regulating windings, and the multiple voltage regulating mechanisms are all located in a single tank of the multi-port transformer. Each secondary-side voltage regulating winding includes a central tap and multiple taps; each secondary-side voltage regulating winding is connected to its corresponding voltage regulating mechanism via the multiple taps, and each voltage regulating winding is connected to the high-voltage winding via the central tap. Each voltage regulating mechanism includes an intermediate tap and multiple taps; each tap is connected to its corresponding tap, and the intermediate tap is connected to the high-voltage winding via the central tap. The multiple voltage regulating mechanisms employ self-resetting magnetically controlled on-load tap changers.

[0027] It should be noted that the intermediate tap of each voltage regulating mechanism is connected to the input of the multi-port transformer, serving as the reference voltage for the output of the flexible voltage regulating device. The output voltage of the device is adjusted based on this reference voltage. Each secondary voltage regulating winding is connected to its corresponding voltage regulating mechanism, and the taps of each secondary winding correspond one-to-one with the taps of the voltage regulating mechanism. The output of the voltage regulating mechanism is connected to the load of each branch. The structure of the self-resetting magnetically controlled on-load tap changer can be as follows: Figure 2 As shown, self-resetting magnetically controlled on-load tap changers are widely used in this field, and will not be described in detail here.

[0028] The DC self-resetting drive, combined with the transition resistor and vacuum bulb design, in the self-positioning magnetically controlled on-load tap changer (i.e., self-resetting magnetically controlled on-load tap changer) achieves precise and rapid range control and safe reset of the on-load tap changer through "electromagnetic-mechanical" energy conversion. It is the core actuator for flexible voltage regulation devices to achieve automated voltage regulation. Its advantages include: fast range switching speed, completing the switching in only milliseconds; smoother load operation with almost imperceptible power supply interruption; small size, which can be directly integrated into the transformer tank; the electromagnet is only energized for a moment during range adjustment (and de-energized during stable operation), eliminating mechanical losses such as gear wear and motor aging, resulting in extremely low power consumption; vacuum bulb arc extinguishing, eliminating oil arc pollution; almost no daily maintenance required; and low maintenance costs over its lifespan.

[0029] To address the drawback of long switching times in conventional on-load tap changers, this invention provides a multi-branch flexible tap changer for power distribution networks. The tap changer mechanism of this device employs a self-positioning magnetically controlled on-load tap changer. With DC self-resetting drive combined with transition resistors and vacuum bulbs, and through "electromagnetic-mechanical" energy conversion, it achieves precise and rapid tap position control and safe reset of the on-load tap changer. The tap position switching speed is fast, completing the switching in just milliseconds.

[0030] In some alternative implementations, the voltage regulating mechanism may also use any specific on-load tap changer.

[0031] Optionally, the multi-branch flexible voltage regulating device further includes: multiple bypass circuit breakers; the input port of each phase transformer module is connected to its corresponding multiple output ports through the multiple bypass circuit breakers.

[0032] It should be noted that each branch of the multi-branch flexible voltage regulating device is equipped with a bypass circuit breaker, which is connected across the input of the incoming circuit breaker on the power supply side and the output of each branch's output circuit breaker. When the flexible voltage regulating device is out of operation, malfunctions, or requires maintenance, the bypass circuit breaker is closed to supply power to the loads of each branch, achieving uninterrupted power supply switching of the device.

[0033] To address the drawback of conventional on-load tap changer regulation, which causes load power outages when the on-load tap changer transformer fails, this invention provides a multi-branch flexible tap changer device for power distribution networks. This device offers a smoother load-carrying process with virtually imperceptible power supply interruptions. Furthermore, by incorporating a bypass switch, the device can bypass the multi-port transformer directly when the flexible tap changer malfunctions or requires maintenance, ensuring continuous power supply to each branch load and achieving uninterrupted power supply switching.

[0034] Optionally, the multi-branch flexible voltage regulating device further includes: an energy harvesting winding and a control module; the energy harvesting winding supplies power to the control module and the voltage regulating mechanism respectively; the control module is used to obtain a gear adjustment command based on the voltage of multiple branches in the multi-branch flexible voltage regulating device, and based on the gear adjustment command, control the voltage regulating mechanism in the multi-port transformer to adjust the gear, thereby realizing the dynamic adjustment of the voltage of each branch.

[0035] It should be noted that the flexible voltage regulator is also equipped with a control module, providing a multi-branch flexible voltage regulation method. The control module receives data from various sensors and adjusts the operating state of the voltage regulating mechanism according to control requirements to maintain optimal voltage levels and power transmission efficiency. This design enables the distribution network to effectively cope with various operating conditions, including changing load demands and potential fault scenarios.

[0036] Optionally, the multi-branch flexible voltage regulating device further includes: multiple current sensors and multiple voltage transformers; the multiple current sensors and the multiple voltage transformers are respectively disposed at the input port and each output port of the multi-port transformer.

[0037] It should be noted that the control module is connected to multiple current sensors and multiple voltage transformers, receiving current data collected by the current sensors and voltage data collected by the voltage transformers. Based on the current and voltage data, it controls the multi-branch flexible voltage regulating device. Each output branch of the multi-port transformer is equipped with an output circuit breaker, a current transformer (CT), and a voltage transformer (PT).

[0038] This invention discloses a multi-branch flexible voltage regulating device for power distribution networks and its control method. It can effectively solve the problems of the inability to independently regulate the voltage of each branch of the power distribution network and the slow regulation speed of traditional on-load tap changers. The multi-branch flexible voltage regulating device can realize differentiated, rapid, and automatic voltage regulation of multiple branches, and can achieve uninterrupted power supply switching.

[0039] This invention discloses a flexible voltage regulating device for multiple branches of a distribution network, aiming to achieve flexible regulation and dynamic compensation of the voltage of each branch of the distribution network. The core components of the device adopt a transformer and a magnetically controlled on-load tap changer design. The device has n+1 ports, which can perform differentiated automatic, rapid, and independent regulation of the voltage of the n connected branches, effectively suppressing voltage fluctuations and significantly improving power quality. That is, each output port is connected to the corresponding branch, realizing differentiated automatic and independent regulation of the voltage of the n connected branches simultaneously, effectively suppressing voltage fluctuations, realizing flexible regulation and dynamic compensation of the distribution network voltage, significantly improving power quality, and achieving uninterrupted power supply conversion.

[0040] This device features a bypass switch design. When the flexible voltage regulating equipment malfunctions or requires maintenance, the bypass switch can directly bypass the multi-port transformer, ensuring continuous power supply to each branch load and achieving uninterrupted power switching. Furthermore, the device employs a DC self-resetting magnetically controlled on-load tap changer, offering fast switching speeds, completing the switch in milliseconds; smoother load operation with virtually imperceptible power interruption; compact size, allowing direct integration into the transformer tank; and an electromagnet coil in the electromagnetic drive mechanism that is only energized during the tap-changing action (de-energized during stable operation), eliminating mechanical losses such as gear wear and motor aging, resulting in extremely low power consumption. Vacuum bubble arc extinguishing eliminates oil-based arc pollution, requiring virtually no routine maintenance and resulting in low maintenance costs throughout its lifespan.

[0041] The multi-branch flexible voltage regulating device is connected to the AC power supply side via an incoming circuit breaker. The incoming line is equipped with a current transformer (CT) for current acquisition and a voltage transformer (PT) for voltage acquisition. The output of the incoming circuit breaker is connected to the high-voltage winding of the multi-port transformer. The ends of the three-phase high-voltage windings are connected to form the neutral point. Each secondary voltage regulating winding of the multi-port transformer is connected to a corresponding voltage regulating mechanism. The taps of each secondary winding correspond one-to-one with the taps of the voltage regulating mechanism. The outputs of the voltage regulating mechanism are connected to the load of each branch. Additionally, each output branch of the multi-port transformer is equipped with an output circuit breaker, a current transformer (CT), and a voltage transformer (PT).

[0042] The multi-port transformer is also equipped with an energy extraction winding to supply power to the secondary equipment of the device.

[0043] The overall design of the device enables the distribution network to flexibly respond to various complex operating conditions such as changes in load demand and equipment failures. Fault isolation is achieved through the opening and closing operations of circuit breakers. While ensuring power supply continuity, it fully achieves the distribution network's flexible voltage regulation goal of "differentiated and independent multi-branch regulation, high reliability, low operation and maintenance costs, and small footprint".

[0044] For example, the present invention proposes a flexible voltage regulating device for multiple branches of a power distribution network, such as... Figure 3As shown, its core consists of a multi-port transformer, multiple circuit breakers (i.e., incoming line circuit breakers and branch circuit breakers), multiple bypass circuit breakers, and PT / CTs. The multi-port transformer has n+1 (n ≤ 6) ports, with the first port being the input port and the second to n+1 being output ports. Each output port supplies power to its corresponding branch load. The multi-port transformer includes one high-voltage winding, n secondary voltage regulating windings, n voltage regulating mechanisms, and one energy extraction winding, all housed in a single tank. The n voltage regulating windings can have the same or different number of turns. Each voltage regulating winding has multiple taps, and each winding is connected to a corresponding voltage regulating mechanism. The input of the multi-port transformer is the power supply side incoming line, and the output corresponds to the n different branches. The multi-branch flexible voltage regulating device aims to achieve flexible regulation and dynamic compensation of the distribution network voltage. It can automatically and independently regulate the voltage of multiple connected branches, effectively suppressing voltage fluctuations, significantly improving power quality, and achieving uninterrupted power supply transition.

[0045] The incoming line of the multi-branch flexible voltage regulating device is the power supply side of the feeder. A voltage measuring device TV0, a ​​current measuring device CT0, and an incoming line circuit breaker QF0 are configured at the incoming line. One side of QF0 is connected to the current CT0, and the other side is connected to the input side of the multi-port transformer, i.e., the high-voltage winding. The three-phase ends of the high-voltage winding are connected to form a neutral point.

[0046] The first secondary regulating winding of the multi-port transformer is connected to the regulating mechanism 1. The output of the regulating mechanism 1 is connected to one end of the circuit breaker (i.e., branch circuit breaker) QF1 on the load side 1. The other end of QF1 is connected to the current measuring CT1 and the voltage measuring TV1. The other end of the current measuring CT1 is the first output port branch 1 of the flexible voltage regulating device, which supplies power to the load (i.e., branch load) of branch 1.

[0047] The second secondary voltage regulating winding of the multi-port transformer is connected to the voltage regulating mechanism 2. The output of the voltage regulating mechanism 2 is connected to one end of the circuit breaker (i.e., branch circuit breaker) QF2 on the load side 2. The other end of QF2 is connected to the current measuring CT2 and the voltage measuring TV2. The other end of the current measuring CT2 is the second output port branch 2 of the flexible voltage regulating device, which supplies power to the load (i.e., branch load) of branch 2.

[0048] Similarly, the nth secondary regulating winding of the multi-port transformer is connected to the regulating mechanism n. The output of the regulating mechanism n is connected to one end of the circuit breaker QFn on the load side n (i.e., the branch circuit breaker). The other end of QFn is connected to the current measuring CTn and the voltage measuring TVn. The other end of the current measuring CTn is the nth output port branch n of the flexible voltage regulating device, which supplies power to the load of branch n (i.e., the branch load).

[0049] In addition, the flexible voltage regulator is equipped with bypass circuit breakers QF_pl1~QF_pln. QF_pl1 is connected to the input of QF0 at one end and the output of QF1 at the other. QF_pl2 is connected to the input of QF0 at one end and the output of QF2 at the other, and so on. QF_pln is connected to the input of QF0 at one end and the output of QFn at the other. When the flexible voltage regulator is out of service, malfunctions, or requires maintenance, QF_pl1~QF_pln are first closed, and then QF1~QFn are opened. At this time, power supply to the loads of branches 1 to n is completely interrupted by bypassing QF_pl1~QF_pln. Furthermore, when a single branch fails and requires a separate power outage, the corresponding output circuit breaker of the flexible voltage regulator can be opened individually, while other branches continue to operate normally.

[0050] The internal wiring diagram of the multi-port transformer is attached. Figure 4 As shown, A, B, and C represent the three-phase power input terminals, which are connected to the three input terminals A1, B1, and C1 of the multi-port transformer; A1-X, B1-Y, and C1-Z are the high-voltage windings of the multi-port transformer, and the ends X, Y, and Z of the high-voltage windings of the multi-port transformer are connected together to form the neutral point. a 11- a 12. B11-B12 and C11-C12 are the first set of secondary voltage regulating windings 1 of the multi-port transformer. Each tap of the first set of secondary voltage regulating windings 1 is connected to the tap of the first on-load tap changer. a 1. b1 and c1 are the output terminals of the first group of on-load tap changers, connected to output branch 1; a twenty one- a 22. B21-B22 and C21-C22 are the second set of secondary voltage regulating windings 2 of the multi-port transformer. Each tap of the second set of secondary voltage regulating windings 2 is connected to the tap of the second on-load tap changer. a 2. b2 and c2 are the output terminals of the second group of on-load tap changers, connected to output branch 2; and so on. a n1- a n2, bn1-bn2, and cn1-cn2 are the nth secondary voltage regulating windings n of a multi-port transformer. Each tap of the nth secondary voltage regulating winding n is connected to the tap of the nth on-load tap changer. a n, bn, and cn are the output terminals of the nth group of on-load tap changers, which are connected to the output branch n. a 3-0, b3-0, and c3-0 are the 380V energy extraction windings of the multi-port transformer, connected in a star configuration, used to supply secondary power to the device; a 3. B3 and C3 represent the output of the energy extraction winding; the intermediate tap of the first group of on-load tap changers. a10, b10, and c10 are connected to A1, B1, and C1 of the multi-port transformer, respectively, and are the intermediate taps of the second set of on-load tap changers. a 20, b20, and c20 are connected to A1, B1, and C1 of the multi-port transformer, respectively, and so on, to the intermediate tap of the nth group of on-load tap changers. a n0, bn0, and cn0 are connected to A1, B1, and C1 of the multi-port transformer, respectively, to serve as the reference voltage for each branch output of the device. The output voltage of each branch is adjusted based on this reference voltage.

[0051] The voltage regulating mechanisms 1 to n employ a self-positioning magnetically controlled on-load tap changer. With DC self-resetting drive, a transition resistor, and a vacuum bulb design, and through "electromagnetic-mechanical" energy conversion, precise and rapid range control and safe reset of the on-load tap changer are achieved. This makes it the core actuator for automated voltage regulation in flexible voltage regulating devices. Its advantages include: fast range switching speed, completing the switch in milliseconds; smoother load operation with virtually no perceptible power interruption; small size, allowing direct integration into the transformer tank; the electromagnet is only energized during range adjustment (de-energized during stable operation), eliminating mechanical losses such as gear wear and motor aging, resulting in extremely low power consumption; and vacuum bulb arc extinguishing, eliminating oil-based arc pollution, requiring almost no daily maintenance, and resulting in low maintenance costs over its lifespan.

[0052] Example 2: Figure 5 A flowchart of a control method for a multi-branch flexible voltage regulating device provided by the present invention is shown below. Figure 5 As shown, the control method may include the following steps 501 to 502: In step 501, a gear adjustment command is obtained based on the voltages of multiple branches in the multi-branch flexible voltage regulating device.

[0053] In step 502, based on the adjustment command, the voltage adjustment mechanism in the multi-branch flexible voltage regulating device is adjusted to achieve dynamic adjustment of the voltage of each branch.

[0054] The multi-branch flexible voltage regulating device mentioned above is the multi-branch flexible voltage regulating device.

[0055] above Figure 5 One possible implementation of step 502 shown may include: when the gear shifting command is an upshift command, based on the upshift command, controlling the upshift relay to operate, applying a positive DC voltage to the electromagnetic coil in the voltage regulating mechanism, thereby realizing the upshift control of the voltage regulating mechanism in the multi-branch flexible voltage regulating device.

[0056] It should be noted that the upshift control process is as follows: Figure 6As shown: When the controller issues an "upgrade" command, the upgrade relay of the controller is activated, which connects the (+) terminal of the electromagnet coil in the electromagnetic drive mechanism of the on-load tap changer to the common terminal (-), applies DC voltage to the electromagnet coil in the positive direction, generates a positive stable magnetic field, and the on-load tap changer moves from the current tap (e.g., n-level) to the previous level (e.g., n+1-level), realizing the boost regulation.

[0057] above Figure 5 Another possible implementation of step 502 shown may include: when the gear shifting command is a downshift command, based on the downshift command, controlling the downshift relay to operate, applying a reverse DC voltage to the electromagnetic coil in the voltage regulating mechanism, thereby realizing the downshift control of the voltage regulating mechanism in the multi-branch flexible voltage regulating device.

[0058] It should be noted that the downshift control process is as follows: Figure 7 As shown: When the controller issues a "downshift" command, the downshift relay of the controller activates, connecting the electromagnet coil (-) to the common terminal (+), applying the DC voltage in reverse to the electromagnet coil, generating a reverse stable magnetic field. The on-load tap changer then moves from the current tap (e.g., n) to the next tap (e.g., n-1), thus achieving voltage reduction regulation. above Figure 5 One possible implementation of step 501 shown may include the following steps 5011-5012: In step 5011, when any branch voltage is greater than the upper limit of the normal voltage range, a downshift command is issued to the voltage regulation mechanism corresponding to the branch voltage being greater than the upper limit of the voltage regulation range.

[0059] In step 5021, when any branch voltage is less than the lower limit of the normal voltage range, an upshift command is issued to the voltage regulation mechanism corresponding to the branch voltage being less than the lower limit.

[0060] It should be noted that, as Figure 8 As shown, during normal operation, the voltage of each branch is monitored in real time. When a branch voltage is detected to be higher than the normal voltage range and exceeds the upper limit of voltage regulation, the voltage of that branch is lowered, and the controller issues a down-level command. When a branch voltage is detected to be lower than the normal voltage range and exceeds the lower limit of voltage regulation, the voltage of that branch is higher, and the controller issues an up-level command. When a branch voltage is detected to be within the normal voltage range, the original level is maintained, and no voltage adjustment is performed. Individual adjustment of n branches (i.e., individual voltage adjustment of n branches) does not affect each other; that is, for any branch whose voltage does not exceed the normal voltage range, the original level is maintained, and no voltage adjustment is performed.

[0061] For example, if the voltage of branch 1 is higher than the normal value, the voltage of branch 2 is lower than the normal value, and the voltages of other branches are normal, then the controller sends a downshift command to voltage regulating mechanism 1, and a upshift command to voltage regulating mechanism 2. Other voltage regulating mechanisms 1 do not send upshift or downshift commands.

[0062] Optionally, in the above Figure 5 Before step 501 shown, the method may further include the following steps S1 to S4: In step S1, it is determined that the incoming circuit breaker and multiple branch circuit breakers in the multi-branch flexible voltage regulating device are all in the open state.

[0063] In step S2, it is determined that the pressure regulating mechanism in the multi-branch flexible pressure regulating device is in the 0 position.

[0064] In step S3, the incoming line circuit breaker and the multiple branch circuit breakers are controlled to close sequentially, and the bypass circuit breaker corresponding to each branch load is controlled to open.

[0065] In step S4, the voltage regulating mechanism in the multi-branch flexible voltage regulating device is controlled so that each branch load is powered through each output port of the multi-branch flexible voltage regulating device.

[0066] It should be noted that steps S1 to S4 above refer to the start-up control of the multi-branch flexible voltage regulator. The start-up control of this device (i.e., the multi-branch flexible voltage regulator) includes: before the device is put into operation, n bypass switches are in the closed state, and the incoming circuit breaker and the output circuit breakers of each branch are in the open state; when the device starts, first confirm that the on-load tap changer of each voltage regulating mechanism is in the 0 position; then close the incoming circuit breaker, and then close each branch circuit breaker in sequence. At this time, each branch supplies power to the load through the bypass circuit breaker and the output ports of the flexible voltage regulator in parallel; then, sequentially disconnect the bypass circuit breakers of each branch, and the load of each branch is supplied by the output ports of the individual voltage regulator. For example, before the equipment is put into operation, the bypass switches QF_pl1~QF_pln are in the closed state, and the incoming circuit breaker QF0 and the output circuit breakers QF1~QFn of each branch are in the open state. When the equipment is started, first confirm that the on-load tap changers of the voltage regulating mechanism 1 to voltage regulating mechanism n are in the 0 position; then close the incoming circuit breaker QF0, and the branch circuit breakers QF1 to QFn are closed in sequence. At this time, each branch supplies power to the load through the bypass circuit breakers QF1~QFn and the output ports of the flexible voltage regulating device in parallel; then disconnect the bypass circuit breakers QF_pl1~QF_pln of each branch in sequence, and the load of each branch is supplied by the output ports of the individual voltage regulating device.

[0067] Optionally, in the above Figure 5 Following step 502, the method may further include the following steps 503-504: In step 503, the pressure regulating mechanism in the multi-branch flexible pressure regulating device is controlled to be in the 0 position.

[0068] In step 504, the bypass circuit breaker corresponding to each branch load is closed, and the incoming circuit breaker and the multiple branch circuit breakers are opened, so that each branch load is powered through its respective bypass circuit breaker.

[0069] It should be noted that steps 503 to 504 above are the exit control of the multi-branch flexible voltage regulating device. The exit control of this device (i.e., the multi-branch flexible voltage regulating device) includes: when the device exits, firstly, the on-load tap changer of each voltage regulating mechanism is turned to the 0 position, then the bypass circuit breaker of each branch is closed to bypass the voltage regulating device, and then the output circuit breaker of each branch is disconnected, the device exits operation, and the load is supplied with power through the bypass circuit breaker.

[0070] For example, when the equipment is shut down, first turn the on-load tap changer switches from tap changer 1 to tap changer n to the 0 position, then close the bypass circuit breakers QF_pl1~QF_pln of each branch to bypass the tap changer, and then disconnect the output circuit breakers QF1~QFn of each branch. The equipment is then shut down and the load is supplied with power through the bypass circuit breakers QF_pl1~QF_pln.

[0071] This invention provides a control method for a multi-branch flexible voltage regulating device in a power distribution network. Based on the flexible voltage regulating device described above, the control method may include: device start-up control, device shutdown control, and device voltage regulation control.

[0072] Example 3: Based on the same inventive concept, the present invention also provides a computer device, such as... Figure 9As shown, the computer device includes a processor and a memory. The memory stores a computer program, which includes program instructions. The processor executes the program instructions stored in the computer storage medium. The processor may be a Central Processing Unit (CPU), or other general-purpose processors, digital signal processors (DSPs), application-specific integrated circuits (ASICs), field-programmable gate arrays (FPGAs), or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc. It is the computing and control core of the terminal, and is suitable for implementing one or more instructions. Specifically, it is suitable for loading and executing one or more instructions in the computer storage medium to implement the corresponding method flow or corresponding function, so as to realize the steps of the control method of a multi-branch flexible voltage regulation device in the above embodiment.

[0073] Example 4: Based on the same inventive concept, this invention also provides a storage medium, specifically a computer-readable storage medium (Memory), which is a memory device in a computer device used to store programs and data. It is understood that the computer-readable storage medium here can include both the built-in storage medium in the computer device and extended storage media supported by the computer device. The computer-readable storage medium provides storage space that stores the terminal's operating system. Furthermore, this storage space also stores one or more instructions suitable for loading and execution by a processor. These instructions can be one or more computer programs (including program code). It should be noted that the computer-readable storage medium here can be high-speed RAM or non-volatile memory, such as at least one disk storage device. The processor can load and execute one or more instructions stored in the computer-readable storage medium to implement the steps of the control method for a multi-branch flexible voltage regulation device in the above embodiments.

[0074] Those skilled in the art will understand that embodiments of the present invention can be provided as methods, systems, or computer program products. Therefore, the present invention can take the form of a completely hardware embodiment, a completely software embodiment, or an embodiment combining software and hardware aspects. Furthermore, the present invention can take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code.

[0075] This invention is described with reference to flowchart illustrations and / or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the invention. It will be understood that each block of the flowchart illustrations and / or block diagrams, and combinations of blocks in the flowchart illustrations and / or block diagrams, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, special-purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, generate instructions for implementing the flowchart illustrations and / or block diagrams. Figure 1 One or more processes and / or boxes Figure 1 A device that provides the functions specified in one or more boxes.

[0076] These computer program instructions may also be stored in a computer-readable storage medium that can direct a computer or other programmable data processing device to function in a particular manner, such that the instructions stored in the computer-readable storage medium produce an article of manufacture including instruction means, which are implemented in a process Figure 1 One or more processes and / or boxes Figure 1 The function specified in one or more boxes.

[0077] These computer program instructions may also be loaded onto a computer or other programmable data processing equipment to cause a series of operational steps to be performed on the computer or other programmable equipment to produce a computer-implemented process, thereby providing instructions that execute on the computer or other programmable equipment for implementing the process. Figure 1 One or more processes and / or boxes Figure 1 The steps of the function specified in one or more boxes.

[0078] The above are merely embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention are included within the scope of the claims of the present invention pending approval.

Claims

1. A multi-branch flexible voltage regulating device for a power distribution network, characterized in that, The multi-branch flexible voltage regulating device includes: a multi-port transformer with an integrated voltage regulating mechanism, an incoming line circuit breaker, and multiple branch circuit breakers; The incoming circuit breaker is connected to the input port of the multi-port transformer, and each of the branch circuit breakers is connected to the output port of the multi-port transformer. The input port of the multi-port transformer is connected to the external power distribution network, and each output port of the multi-port transformer is connected to an external branch load.

2. The multi-branch flexible voltage regulating device according to claim 1, characterized in that, The multi-port transformer includes a multi-phase transformer module; Each phase of the transformer module includes: an input port, multiple output ports, a high-voltage winding, multiple secondary voltage regulating windings, and multiple voltage regulating mechanisms; the first end of the high-voltage winding is connected to the input port and each secondary voltage regulating winding, each secondary voltage regulating winding is connected to its corresponding voltage regulating mechanism, and each voltage regulating mechanism is also connected to its corresponding output port; In the multiphase transformer module, the ends of the high-voltage windings are interconnected to form a neutral point.

3. The multi-branch flexible voltage regulating device according to claim 2, characterized in that, The high-voltage winding, the multiple secondary voltage regulating windings, and the multiple voltage regulating mechanisms are all located in one oil tank of the multi-port transformer.

4. The multi-branch flexible voltage regulating device according to claim 2, characterized in that, Each of the secondary voltage regulating windings includes a central tap and multiple taps; Each of the secondary voltage regulating windings is connected to its corresponding voltage regulating mechanism through the plurality of taps, and each of the voltage regulating windings is connected to the beginning end of the high voltage winding through the central shaft tap.

5. The multi-branch flexible voltage regulating device according to claim 4, characterized in that, The pressure regulating mechanism includes an intermediate tap and multiple taps; Each of the taps is connected to its corresponding tap, and the intermediate tap is connected to the beginning of the high-voltage winding via the central shaft tap.

6. The multi-branch flexible voltage regulating device according to claim 2, characterized in that, The multiple voltage regulating mechanisms employ self-resetting magnetically controlled on-load voltage regulating switches.

7. The multi-branch flexible voltage regulating device according to any one of claims 2-6, characterized in that, The multi-branch flexible voltage regulating device also includes: multiple bypass circuit breakers; The input port of each phase transformer module is connected to its corresponding output port through the multiple bypass circuit breakers.

8. The multi-branch flexible voltage regulating device according to claim 1, characterized in that, The multi-branch flexible voltage regulating device also includes: an energy harvesting winding and a control module; The energy harvesting winding supplies power to the control module and the voltage regulating mechanism respectively; The control module is used to obtain a gear adjustment command based on the voltage of multiple branches in the multi-branch flexible voltage regulating device, and based on the gear adjustment command, control the voltage regulating mechanism in the multi-port transformer to adjust the gear, thereby realizing the dynamic adjustment of the voltage of each branch.

9. The multi-branch flexible voltage regulating device according to claim 8, characterized in that, The multi-branch flexible voltage regulating device also includes: multiple current sensors and multiple voltage transformers; The plurality of current sensors and the plurality of voltage transformers are respectively installed at the input port and each output port of the multi-port transformer.

10. A control method for a multi-branch flexible voltage regulating device, characterized in that, The control method includes: Based on the voltage of multiple branches in the multi-branch flexible voltage regulating device, the adjustment command is obtained; Based on the adjustment command, the voltage adjustment mechanism in the multi-branch flexible voltage regulating device is adjusted to achieve dynamic adjustment of the voltage of each branch. The multi-branch flexible voltage regulating device is the multi-branch flexible voltage regulating device described in any one of claims 1-9.

11. The method according to claim 10, characterized in that, The step of adjusting the voltage regulation mechanism in the multi-branch flexible voltage regulating device according to the adjustment command to achieve dynamic adjustment of the voltage of each branch includes: When the gear shifting command is an upshift command, the upshift relay is controlled to operate based on the upshift command, and a positive DC voltage is applied to the electromagnetic coil in the voltage regulating mechanism to realize the upshift control of the voltage regulating mechanism in the multi-branch flexible voltage regulating device.

12. The method according to claim 10, characterized in that, The step of adjusting the voltage regulation mechanism in the multi-branch flexible voltage regulating device according to the adjustment command to achieve dynamic adjustment of the voltage of each branch includes: When the gear shifting command is a downshift command, based on the downshift command, the downshift relay is controlled to operate, and a reverse DC voltage is applied to the electromagnetic coil in the voltage regulating mechanism to realize the downshift control of the voltage regulating mechanism in the multi-branch flexible voltage regulating device.

13. The method according to claim 10, characterized in that, The process of obtaining a voltage adjustment command based on the voltages of multiple branches in the multi-branch flexible voltage regulating device includes: When the voltage of any branch exceeds the upper limit of the normal voltage range, a downshift command is issued to the voltage regulating mechanism corresponding to the branch voltage exceeding the upper limit. When the voltage of any branch is lower than the lower limit of the normal voltage range, an upshift command is issued to the voltage regulating mechanism corresponding to the branch voltage being lower than the lower limit.

14. The method according to any one of claims 10-13, characterized in that, Before obtaining the voltage adjustment command based on the multiple branch voltages in the multi-branch flexible voltage regulating device, the method further includes: It is determined that the incoming circuit breaker and multiple branch circuit breakers in the multi-branch flexible voltage regulating device are all in the open state; Determine that the voltage regulating mechanism in the multi-branch flexible voltage regulating device is in the 0 position; Control the incoming line circuit breaker and the multiple branch circuit breakers to close sequentially, and control the bypass circuit breaker corresponding to each branch load to open. Control the voltage regulating mechanism in the multi-branch flexible voltage regulating device so that each branch load is powered through each output port of the multi-branch flexible voltage regulating device.

15. The method according to any one of claims 10-13, characterized in that, After controlling the voltage regulating mechanism in the multi-branch flexible voltage regulating device based on the gear shift command, the method further includes: The voltage regulating mechanism in the multi-branch flexible voltage regulating device is controlled to be in the 0 position; Control the closing of the bypass circuit breaker corresponding to each branch load, and control the opening of the incoming circuit breaker and the multiple branch circuit breakers, so that each branch load is powered through its respective bypass circuit breaker.

16. A computer device, characterized in that, include: One or more processors; The processor is used to store one or more programs; When the one or more programs are executed by the one or more processors, a control method for a multi-branch flexible voltage regulating device as described in any one of claims 10 to 15 is implemented.

17. A computer-readable storage medium, characterized in that, It contains a computer program, which, when executed, implements a control method for a multi-branch flexible voltage regulating device as described in any one of claims 10 to 15.

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