Voltage compensation method and system for power distribution network, computer device and storage medium

Abstract

The application relates to a voltage compensation method and system of a power distribution network, computer equipment and a storage medium. The voltage compensation method of the power distribution network is applied to a voltage compensation system comprising a voltage compensation circuit, the voltage compensation circuit comprising a first thyristor assembly, a second thyristor assembly and an energy storage control circuit. A control system in the voltage compensation system receives a detection result of whether a voltage sag occurs on a first feeder, and in the case that a voltage sag occurs on the first feeder, the energy storage control circuit is actively turned off by the control system, power is supplied to an electrical load through the energy storage control circuit, a standby power source is turned on to control the second thyristor assembly, and power is supplied to the electrical load through the second thyristor assembly. The method can reduce the power switching time, thereby reducing the influence and loss on the voltage-sensitive load.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of power systems, in particular to a voltage compensation method and system for a power distribution network, a computer device and a storage medium. BACKGROUND

[0002] With the continuous expansion of industrial scale, users have higher and higher requirements for power quality. Once voltage sag or interruption occurs in the power distribution network, it will cause huge economic losses to the users, especially for voltage-sensitive loads connected to the power distribution network.

[0003] In the traditional technology, the problem of voltage sag or interruption is usually solved by adopting a double-circuit power supply mode, specifically, two-way thyristor switching main and standby power sources are adopted. In the case of voltage sag or interruption of the feeder connected to the main power source in the power distribution network, the standby power source is switched to supply power to the power load.

[0004] However, the thyristor switching still needs a certain time, so the entire power distribution network will still have a short-time voltage sag or interruption, which will further affect and damage the voltage-sensitive load. SUMMARY

[0005] Therefore, it is necessary to provide a voltage compensation method and system for a power distribution network, a computer device and a storage medium to solve the above technical problems.

[0006] A voltage compensation method for a power distribution network is applied to a voltage compensation system, the voltage compensation system comprising a voltage compensation circuit, the voltage compensation circuit comprising a first thyristor assembly, a second thyristor assembly and an energy storage control circuit, one end of the first thyristor assembly being connected to a first feeder of the power distribution network, the first feeder being connected to a main power source, one end of the second thyristor assembly being connected to a second feeder of the power distribution network, the second feeder being connected to a standby power source, the other end of the first thyristor assembly, the other end of the second thyristor assembly and the energy storage control circuit being connected to a power supply bus of the power distribution network, the power supply bus being connected to a power load, the method comprising:

[0007] receiving a detection result of whether voltage sag occurs on the first feeder;

[0008] if voltage sag occurs on the first feeder, controlling the energy storage control circuit to disconnect the first thyristor assembly, and supplying power to the power load through the energy storage control circuit; wherein, in the case that no voltage sag occurs on the first feeder, the first thyristor assembly remains conductive, the second thyristor assembly remains disconnected, the main power source supplies power to the power load through the first thyristor assembly, and stores energy for the energy storage control circuit;

[0009] controlling the standby power source to conduct the second thyristor assembly, and supplying power to the power load through the second thyristor assembly.

[0010] In one of the embodiments, the method of controlling the energy storage control circuit to turn off the first thyristor assembly comprises:

[0011] The energy storage control circuit outputs a first electrical signal; wherein the voltage value of the first electrical signal is greater than the voltage value of the electrical signal inputted by the main power supply to the first feeder.

[0012] In one of the embodiments, before controlling the backup power supply to turn on the second thyristor assembly, the method further comprises:

[0013] The energy storage control circuit outputs a second electrical signal; wherein the voltage value of the second electrical signal is the same as the voltage value of the electrical signal inputted by the backup power supply to the second feeder.

[0014] In one of the embodiments, when the backup power supply supplies power to the electrical load through the second thyristor assembly, the method further comprises:

[0015] Receiving a detection result of whether a voltage sag occurs on the second feeder;

[0016] If a voltage sag occurs on the second feeder, controlling the energy storage control circuit to turn off the second thyristor assembly and supply power to the electrical load through the energy storage control circuit;

[0017] Controlling the main power supply to turn on the first thyristor assembly and supply power to the electrical load through the first thyristor assembly.

[0018] In one of the embodiments, the method of controlling the energy storage control circuit to turn off the second thyristor assembly comprises:

[0019] The energy storage control circuit outputs a third electrical signal; wherein the voltage value of the third electrical signal is greater than the voltage value of the electrical signal inputted by the backup power supply to the second feeder; and / or

[0020] Before controlling the main power supply to turn on the first thyristor assembly, the method further comprises:

[0021] The energy storage control circuit outputs a fourth electrical signal; wherein the voltage value of the fourth electrical signal is the same as the voltage value of the electrical signal inputted by the main power supply to the first feeder.

[0022] In one of the embodiments, the first thyristor assembly and the second thyristor assembly each comprise a three-phase switching circuit, each phase switching circuit comprises a plurality of switching units connected in series, each switching unit comprises a group of anti-parallel thyristors and a voltage equalization circuit, and each phase switching circuit is connected with a corresponding phase power supply bus.

[0023] In one of the embodiments, the energy storage control circuit comprises three-phase control circuits, each of the three-phase control circuits comprises a plurality of control units connected in cascade, each of the control units comprises: a super capacitor, a converter and an IGBT module; wherein four IGBT modules form an H-bridge structure, the AC side of the H-bridge structure is connected in cascade for output, and the DC side is connected with the super capacitor through the converter; and each of the three-phase control circuits is connected with a power supply bus of a corresponding phase.

[0024] A voltage compensation system comprises a control system and a voltage compensation circuit, the voltage compensation circuit comprises a first thyristor assembly, a second thyristor assembly and an energy storage control circuit, one end of the first thyristor assembly is connected with a first feeder of a power distribution network, the first feeder is connected with a main power supply, one end of the second thyristor assembly is connected with a second feeder of the power distribution network, the second feeder is connected with a backup power supply, the other end of the first thyristor assembly, the other end of the second thyristor assembly and the energy storage control circuit are connected with a power supply bus of the power distribution network, the power supply bus is connected with an electrical load, and the control system comprises:

[0025] a result receiving module configured to receive a detection result of whether a voltage sag occurs on the first feeder;

[0026] a switch opening module configured to control the energy storage control circuit to open the first thyristor assembly in the case that the voltage sag occurs on the first feeder, and supply power to the electrical load through the energy storage control circuit; wherein in the case that the voltage sag does not occur on the first feeder, the first thyristor assembly remains conductive, the second thyristor assembly remains open, the main power supply supplies power to the electrical load through the first thyristor assembly, and stores energy for the energy storage control circuit;

[0027] a switch closing module configured to control the energy storage control circuit to close the second thyristor assembly, and supply power to the electrical load through the second thyristor assembly.

[0028] A computer device comprises a memory and a processor, the memory stores a computer program, and the processor implements the following steps when executing the computer program:

[0029] receiving a detection result of whether a voltage sag occurs on the first feeder;

[0030] if the voltage sag occurs on the first feeder, controlling the energy storage control circuit to open the first thyristor assembly, and supplying power to the electrical load through the energy storage control circuit; wherein in the case that the voltage sag does not occur on the first feeder, the first thyristor assembly remains conductive, the second thyristor assembly remains open, the main power supply supplies power to the electrical load through the first thyristor assembly, and stores energy for the energy storage control circuit;

[0031] controlling the backup power supply to close the second thyristor assembly, and supplying power to the electrical load through the second thyristor assembly.

[0032] A computer readable storage medium having stored thereon a computer program which, when executed by a processor, implements the following steps:

[0033] receiving a detection result of whether a voltage sag occurs on the first feeder;

[0034] if the voltage sag occurs on the first feeder, controlling the energy storage control circuit to turn off the first thyristor assembly and supply power to the power consumption load through the energy storage control circuit; wherein, in the case that the voltage sag does not occur on the first feeder, the first thyristor assembly remains turned on, the second thyristor assembly remains turned off, the main power supply supplies power to the power consumption load through the first thyristor assembly, and stores energy for the energy storage control circuit;

[0035] controlling the standby power supply to turn on the second thyristor assembly and supply power to the power consumption load through the second thyristor assembly.

[0036] The voltage compensation method, system, computer device and storage medium of the power distribution network. The voltage compensation method of the power distribution network is applied to a voltage compensation system comprising a voltage compensation circuit, the voltage compensation circuit comprising a first thyristor assembly, a second thyristor assembly and an energy storage control circuit, one end of the first thyristor assembly being connected to a first feeder of the power distribution network, the first feeder being connected to a main power supply, one end of the second thyristor assembly being connected to a second feeder of the power distribution network, the second feeder being connected to a standby power supply, the other end of the first thyristor assembly, the other end of the second thyristor assembly and the energy storage control circuit being connected to a power supply bus of the power distribution network, the power supply bus being connected to a power consumption load. The control system in the voltage compensation system receives a detection result of whether a voltage sag occurs on the first feeder, and in the case that the voltage sag occurs on the first feeder, controls the energy storage control circuit to actively turn off the first thyristor assembly and supply power to the power consumption load through the energy storage control circuit, and controls the standby power supply to turn on the second thyristor assembly and supply power to the power consumption load through the second thyristor assembly. The control system controls the energy storage control circuit to actively turn off the first thyristor assembly, which reduces the time consumption of power switching and further reduces the impact and loss on voltage-sensitive loads. BRIEF DESCRIPTION OF DRAWINGS

[0037] Figure 1 A structural schematic diagram of the voltage compensation circuit in one embodiment;

[0038] Figure 2 A flowchart of the voltage compensation method in one embodiment;

[0039] Figure 3 A schematic diagram of the signal transmission process in the voltage compensation circuit when the voltage sag does not occur on the first feeder in the power distribution network in one embodiment;

[0040] Figure 4A schematic diagram of a signal transmission process in the voltage supplement circuit when a voltage sag occurs in the first feeder of the power distribution network in an embodiment;

[0041] Figure 5 A schematic diagram of a signal transmission process in the voltage supplement circuit when the standby power supply supplies power to the power load in the power distribution network in an embodiment;

[0042] Figure 6 A schematic diagram of a flow of the voltage compensation method in another embodiment;

[0043] Figure 7 A structural block diagram of the control system in an embodiment;

[0044] Figure 8 An internal structural diagram of the computer device in an embodiment. DETAILED DESCRIPTION

[0045] In order to make the purposes, technical solutions and advantages of the present application clearer, the present application is further described in detail below with reference to the drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and not to limit the present application.

[0046] The voltage compensation method of the power distribution network provided by the present application is applied to a voltage compensation system, which includes a voltage compensation circuit as shown in Figure 1 The voltage compensation circuit includes a first thyristor assembly 101, a second thyristor assembly 102 and an energy storage control circuit 103. One end of the first thyristor assembly 101 is connected to a first feeder I of the power distribution network, and the first feeder I is connected to a main power supply E1. One end of the second thyristor assembly 102 is connected to a second feeder II of the power distribution network, and the second feeder II is connected to a standby power supply E2. The other end of the first thyristor assembly 101, the other end of the second thyristor assembly 102 and the energy storage control circuit 103 are connected to a power supply bus of the power distribution network, and the power supply bus is connected to a power load L.

[0047] The first thyristor assembly 101 and the second thyristor assembly 102 each include an A, B, C three-phase switching circuit. Each phase switching circuit includes a plurality of switching units S connected in series, and each switching unit S includes a group of anti-parallel thyristors and a voltage equalization circuit. Each phase switching circuit is connected to a corresponding phase power supply bus. For example, the A-phase switching circuit is connected to the A-phase power supply bus, the B-phase switching circuit is connected to the B-phase power supply bus, and the C-phase switching circuit is connected to the C-phase power supply bus.

[0048] Optionally, each phase switching circuit includes six switching units S connected in series.

[0049] The energy storage control circuit 103 comprises three-phase control circuits, each of which comprises a plurality of control units M connected in cascade, each of which comprises a super capacitor, a converter and an IGBT module. Four IGBT modules form an H-bridge structure, the AC side of the H-bridge structure is connected in cascade and outputs, and the DC side is connected with the super capacitor through the converter; each phase control circuit is connected with the power supply bus of the corresponding phase. For example, the A-phase control circuit is connected with the A-phase power supply bus, the B-phase control circuit is connected with the B-phase power supply bus, and the C-phase control circuit is connected with the C-phase power supply bus.

[0050] Optionally, each phase control unit comprises 15 control units M connected in cascade. The converter is a Buck-Boost converter.

[0051] Specifically, the energy storage control circuit 103 is a static var generator (SVG), which is connected with the power supply bus in the power distribution network through a reactor and is responsible for providing power factor compensation, harmonic filtering and three-phase imbalance adjustment.

[0052] Optionally, the circuit compensation circuit 103 can further comprise a first switch and a second switch, the first switch is connected in series with each phase switching unit for independent control of each phase switching unit, and the second switch is connected in parallel with each phase switching unit for directly supplying power to the power supply bus when the parallel switching unit fails.

[0053] In one embodiment, as shown in Figure 2 A voltage compensation method for a power distribution network is provided, which is described by taking the application of the method to a voltage compensation system as an example, and comprises the following steps:

[0054] S210, receiving a detection result of whether a voltage sag occurs on the first feeder.

[0055] Optionally, the voltage compensation system further comprises a detection device for detecting whether a voltage sag occurs in the power distribution network and sending a detection result of whether a voltage sag occurs on the first feeder in the power distribution network to a control system in the voltage compensation system, and the control system receives the detection result of whether a voltage sag occurs on the first feeder.

[0056] S220, if a voltage sag occurs on the first feeder, controlling the energy storage control circuit to disconnect the first thyristor assembly and supply power to the power load through the energy storage control circuit.

[0057] In the case where no voltage sag occurs on the first feeder, the first thyristor assembly remains conductive, the second thyristor assembly remains disconnected, the main power supply supplies power to the power load through the first thyristor assembly, and the energy storage control circuit stores energy.

[0058] Specifically, as shown in FIG. 1, when no voltage sag occurs in the first feeder I, the first thyristor assembly 101 remains on, the second thyristor assembly 102 remains off, the main power supply E1 passes through the first thyristor assembly 101 to supply power to the connected power-consuming load L on the power supply bus, and the energy storage control circuit 103 stores energy. Figure 3 As shown in FIG. 2, when a voltage sag occurs in the first feeder I, the control system actively controls the first thyristor assembly 101 to be off through the energy storage control circuit 103 in the voltage compensation circuit, and uses the power stored by the energy storage control circuit 103 when no voltage sag occurs in the first feeder I to supply power to the connected power-consuming load L on the power supply bus. Figure 4

[0059] S230, control the standby power supply to turn on the second thyristor assembly, and supply power to the power-consuming load through the second thyristor assembly.

[0060] Specifically, as shown in FIG. 1, when no voltage sag occurs in the first feeder I, the first thyristor assembly 101 remains on, the second thyristor assembly 102 remains off, the main power supply E1 passes through the first thyristor assembly 101 to supply power to the connected power-consuming load L on the power supply bus, and the energy storage control circuit 103 stores energy. Figure 5

[0061] It should be noted that the thyristor assembly can only be off when the input current is 0, and the main power supply in the power distribution network provides alternating current, and when a voltage sag occurs, the current is not 0, at this time, the first thyristor assembly will be off after waiting for the current to be 0, and then the power-consuming load is supplied power through the energy storage control circuit. Since the first thyristor assembly cannot be turned off in time after a voltage sag occurs in the power distribution network, the power supply switching is not timely, and the entire power distribution network will still experience a short-time voltage sag or interruption, thereby affecting and losing the voltage-sensitive load.

[0062] ​​In this embodiment, the voltage compensation method for the distribution network is applied to a voltage compensation system including a voltage compensation circuit. This voltage compensation circuit includes a first thyristor assembly, a second thyristor assembly, and an energy storage control circuit. One end of the first thyristor assembly is connected to a first feeder of the distribution network, which is connected to the main power supply. One end of the second thyristor assembly is connected to a second feeder of the distribution network, which is connected to a backup power supply. The other ends of the first and second thyristor assemblies, along with the energy storage control circuit, are connected to the power supply bus of the distribution network, which is connected to the electrical load. The control system in the voltage compensation system receives the detection result of whether a voltage dip occurs on the first feeder. If a voltage dip occurs on the first feeder, the control system actively disconnects the first thyristor assembly and supplies power to the electrical load through the energy storage control circuit. Simultaneously, the control system controls the backup power supply to turn on the second thyristor assembly, which then supplies power to the electrical load. The process of the control system actively disconnecting the first thyristor assembly reduces power switching time, thereby reducing the impact and losses on voltage-sensitive loads.

[0063] In one embodiment, the above-described S220 step of controlling the energy storage control circuit to disconnect the first thyristor assembly includes:

[0064] The energy storage control circuit outputs the first electrical signal.

[0065] The voltage value of the first electrical signal is greater than the electrical signal input by the main power supply to the first feeder.

[0066] Specifically, when no voltage dip occurs on the first feeder I, the main power supply E1 inputs an electrical signal to the first feeder I to supply power to the load L and to store energy for the energy storage control circuit 103. Figure 3 As shown), when a voltage dip occurs on the first feeder I, the control system controls the energy storage control circuit 103 to output a first electrical signal (as shown). Figure 4 As shown, since the voltage value of the first electrical signal is greater than the voltage value of the electrical signal input by the main power supply E1 to the first feeder I, the energy storage control circuit 103 can replace the main power supply E1 to temporarily supply power to the electrical load L on the power supply bus, thereby causing the main power supply E1 to stop outputting current, and the first thyristor group 101 can be disconnected when the current is 0.

[0067] In this embodiment, the control system controls the energy storage control circuit to output a first electrical signal. Since the voltage value of the first electrical signal is greater than the voltage value of the electrical signal input by the main power supply to the first feeder, the energy storage control circuit replaces the main power supply to supply power to the electrical load. This causes the first thyristor group to disconnect in time when the voltage of the first feeder drops, so that the subsequent energy storage control circuit / backup power supply can supply power to the electrical load in time, thereby improving the timeliness of voltage compensation.

[0068] In one embodiment, to improve the stability of the voltage compensation circuit, before S230, the above method further comprises:

[0069] The control energy storage control circuit outputs a second electric signal.

[0070] The voltage value of the second electric signal is the same as the voltage value of the electric signal input by the backup power supply to the second feeder.

[0071] Specifically, before controlling the backup power supply E2 to turn on the second thyristor assembly 102, the control system controls the energy storage control circuit 103 to output a second electric signal (as shown in the figure) whose voltage value is the same as the voltage value of the electric signal input by the backup power supply E2 to the second feeder II, so that the voltage across the second thyristor assembly 102 is the same / near, avoiding the instability of the entire voltage compensation circuit caused by the large difference in voltage across the two ends, thereby improving the stability of the voltage compensation circuit and improving the voltage compensation effect. Figure 5

[0072] Optionally, to reduce the power switching energy consumption, before S230, the above method further comprises:

[0073] If the voltage input by the main power supply to the first feeder recovers, the control energy storage control circuit stops outputting the electric current, and the main power supply supplies power to the load.

[0074] Specifically, please continue to refer to Figure 4 If the voltage input by the main power supply E1 to the first feeder I recovers during the power supply of the energy storage control circuit 103 to the load L, the control system controls the energy storage circuit 103 to stop outputting the electric current, so that the main power supply E1 supplies power to the load L. It can also continue to supply power to the load L through the main power supply E1 after the energy storage control circuit 103 runs out of power. In the case of voltage sag and recovery on the first feeder I, the main power supply E1 is continued to be used to supply power to the load L, reducing the power switching energy consumption.

[0075] In one embodiment, as Figure 6 shown, in the case that the backup power supply supplies power to the load through the second thyristor assembly, the above method further comprises:

[0076] S610, receiving the detection result of whether a voltage sag occurs on the second feeder.

[0077] Optionally, the voltage compensation system further comprises a detection device for detecting whether a voltage sag occurs in the power distribution network, and sending the detection result of whether a voltage sag occurs on the second feeder in the power distribution network to the control system in the voltage compensation system, and the control system receives the detection result of whether a voltage sag occurs on the second feeder.

[0078] ​S620. If a voltage dip occurs on the second feeder, the energy storage control circuit will disconnect the second thyristor assembly and supply power to the electrical load through the energy storage control circuit.

[0079] Optionally, if no voltage dip occurs on the second feeder II, such as Figure 5 As shown, the second thyristor assembly 102 remains on, while the first thyristor assembly 101 remains off. The backup power supply E2 supplies power to the electrical load L connected to the power supply bus via the second thyristor assembly 102 and stores energy for the energy storage control circuit 103. In the event of a voltage dip in the second feeder II, such as... Figure 4 As shown, the control system actively controls the second thyristor assembly 102 to disconnect through the energy storage control circuit 103 in the voltage compensation circuit, and uses the energy stored in the energy storage control circuit 103 when no voltage drop occurs on the second feeder II to supply power to the electrical load L connected to the power supply bus.

[0080] Specifically, controlling the energy storage control circuit to disconnect the second thyristor assembly includes:

[0081] The energy storage control circuit outputs a third electrical signal.

[0082] The voltage value of the third electrical signal is greater than the voltage value of the electrical signal input from the backup power supply to the second feeder.

[0083] Specifically, if no voltage dip occurs on the second feeder II, the backup power supply E2 inputs an electrical signal to the second feeder II. Figure 5 As shown), when a voltage dip occurs on the second feeder II, the control system controls the energy storage control circuit 103 to output a third electrical signal (as shown). Figure 4 As shown, since the voltage value of the third electrical signal is greater than the voltage value of the electrical signal input by the backup power supply E2 to the second feeder II, the energy storage control circuit 103 can replace the backup power supply E2 to temporarily supply power to the electrical load L on the power supply bus, thereby causing the backup power supply E2 to stop outputting current, and the second thyristor group 102 can be disconnected when the current is 0.

[0084] S630: Control the main power supply to turn on the first thyristor assembly, and the main power supply supplies power to the electrical load through the first thyristor assembly.

[0085] Specifically, such as Figure 5 As shown, during the period when the energy storage control circuit 103 supplies power to the electrical load L, the control system controls the main power supply E1 to output a signal to turn on the first thyristor assembly 101. Then, after the energy storage control circuit 103 is depleted, the first thyristor assembly 101 can supply power to the electrical load L connected to the power supply bus.

[0086] Optionally, prior to S630, the above method also included:

[0087] The energy storage control circuit outputs a fourth electrical signal.

[0088] The voltage value of the fourth electrical signal is the same as the voltage value of the electrical signal input by the main power supply to the first feeder.

[0089] Specifically, before the main power supply E1 turns on the first thyristor assembly 101, the control system controls the energy storage control circuit 103 to output a fourth electrical signal ( Figure 1 As shown, since the voltage value of the fourth electrical signal is the same as (or similar to) the voltage value of the electrical signal input by the main power supply E1 to the first feeder I, the voltages at both ends of the first thyristor assembly 101 are the same or similar, avoiding the instability of the entire voltage compensation circuit caused by the large voltage difference between the two ends, thereby improving the stability of the voltage compensation circuit and improving the voltage compensation effect.

[0090] In this embodiment, when a voltage dip occurs on the second feeder, voltage compensation can be performed in the same manner as when a voltage dip occurs on the first feeder. This allows the backup power supply to be cut off first, and the energy storage control circuit to act as the power source for the electrical load when a voltage dip occurs on the second feeder. Then, the main power supply is turned on to supply power to the electrical load, thereby achieving timely switching between the main and backup power supplies, improving the timeliness of voltage compensation, and reducing the impact and losses of voltage dips on the electrical load in the distribution network.

[0091] It should be understood that, although Figures 2-6 The steps in the flowchart are shown sequentially as indicated by the arrows, but these steps are not necessarily executed in the order indicated by the arrows. Unless otherwise explicitly stated in this document, there is no strict order in which these steps are executed; they can be performed in other orders. Furthermore, Figures 2-6 At least some of the steps in the process may include multiple steps or multiple stages. These steps or stages are not necessarily completed at the same time, but may be executed at different times. The execution order of these steps or stages is not necessarily sequential, but may be executed in turn or alternately with other steps or at least some of the steps or stages in other steps.

[0092] In one embodiment, a voltage compensation system is provided, comprising: a control system and a voltage compensation circuit, wherein the voltage compensation circuit is as follows: Figure 1As shown, the device comprises a first thyristor assembly 101, a second thyristor assembly 102 and an energy storage control circuit 103, one end of the first thyristor assembly 101 is connected with a first feeder of a power distribution network, the first feeder is connected with a main power supply, one end of the second thyristor assembly 102 is connected with a second feeder of the power distribution network, the second feeder is connected with a backup power supply, the other end of the first thyristor assembly 101, the other end of the second thyristor assembly 102 and the energy storage control circuit 103 are connected with a power supply bus of the power distribution network, the power supply bus is connected with an electrical load, and a control system is connected with the power supply bus. Figure 7 As shown, the device comprises a result receiving module 701, a switch-off module 702 and a switch-on module 704, wherein:

[0093] The result receiving module 701 is configured to receive a detection result of whether a voltage sag occurs on the first feeder.

[0094] The switch-off module 702 is configured to control the energy storage control circuit to turn off the first thyristor assembly in the case that a voltage sag occurs on the first feeder, and supply power to the electrical load through the energy storage control circuit; wherein, in the case that no voltage sag occurs on the first feeder, the first thyristor assembly remains on, the second thyristor assembly remains off, the main power supply supplies power to the electrical load through the first thyristor assembly, and stores energy for the energy storage control circuit.

[0095] The switch-on module 703 is configured to control the energy storage control circuit to turn on the second thyristor assembly, and the backup power supply supplies power to the electrical load through the second thyristor assembly.

[0096] In one embodiment, the switch-off module 702 is specifically configured to:

[0097] control the energy storage control circuit to output a first electric signal; wherein, the voltage value of the first electric signal is greater than the voltage value of an electric signal input by the main power supply to the first feeder.

[0098] In one embodiment, the switch-on module 703 is further configured to:

[0099] control the energy storage control circuit to output a second electric signal; wherein, the voltage value of the second electric signal is the same as the voltage value of an electric signal input by the backup power supply to the second feeder.

[0100] In one embodiment, the result receiving module 701 is further configured to receive a detection result of whether a voltage sag occurs on the second feeder; the switch-off module 702 is further configured to control the energy storage control circuit to turn off the second thyristor assembly in the case that a voltage sag occurs on the second feeder, and supply power to the electrical load through the energy storage control circuit; and the switch-on module 703 is further configured to control the main power supply to turn on the first thyristor assembly, and the main power supply supplies power to the electrical load through the first thyristor assembly.

[0101] In one of the embodiments, the switch-on module 703 is further configured to:

[0102] The control energy storage control circuit outputs a third electric signal, wherein the voltage value of the third electric signal is greater than the voltage value of the electric signal input by the backup power supply to the second feeder; and / or the control energy storage control circuit outputs a fourth electric signal, wherein the voltage value of the fourth electric signal is the same as the voltage value of the electric signal input by the main power supply to the first feeder.

[0103] In one of the embodiments, the first thyristor assembly and the second thyristor assembly each include a three-phase switch circuit, each phase switch circuit includes a plurality of switch units connected in series, each switch unit includes a group of anti-parallel thyristors and a voltage balancing circuit, and each phase switch circuit is connected with the power supply bus of the corresponding phase.

[0104] In one of the embodiments, the energy storage control circuit includes a three-phase control circuit, each phase control circuit includes a plurality of control units connected in series, each control unit includes a super capacitor, a converter, and an IGBT module, wherein four IGBT modules form an H-bridge structure, the AC side of the H-bridge structure is connected in series for output, and the DC side is connected with the super capacitor through the converter, and each phase control circuit is connected with the power supply bus of the corresponding phase.

[0105] The specific definitions of the voltage compensation system of the power distribution network can be referred to the definitions of the voltage compensation method in the above, which will not be repeated here. Each module in the above voltage compensation system can be realized by software, hardware, and combinations thereof, in whole or in part. The above modules can be embedded in or independent of the processor in the computer device in hardware form, or can be stored in the memory in the computer device in software form, so as to be called and executed by the processor to perform the operations corresponding to each of the above modules.

[0106] In one embodiment, a computer device, which can be a server, is provided, and an internal structure diagram thereof can be as shown in Figure 8 The computer device includes a processor, a memory, and a network interface connected through a system bus. The processor of the computer device is configured to provide computing and control capabilities. The memory of the computer device includes a non-volatile storage medium and an internal memory. The non-volatile storage medium stores an operating system, a computer program, and a database. The internal memory provides an environment for the operating system and the computer program in the non-volatile storage medium to run. The database of the computer device is configured to store data required for voltage compensation. The network interface of the computer device is configured to communicate with an external terminal through a network connection. The computer program is executed by the processor to implement a voltage compensation method for a power distribution network.

[0107] Those skilled in the art can understand that Figure 8The structure shown in the figure is only a block diagram of part of the structure related to the scheme of the present application, and does not constitute a limitation on the computer device to which the scheme of the present application is applied. The specific computer device can include more or fewer components than those shown in the figure, or combine certain components, or have a different arrangement of components.

[0108] In one embodiment, a computer device is provided, comprising a memory and a processor, the memory storing a computer program, and the processor implementing the following steps when executing the computer program:

[0109] receiving a detection result of whether a voltage sag occurs on the first feeder; if the voltage sag occurs on the first feeder, controlling the energy storage control circuit to turn off the first thyristor assembly and supply power to the power load through the energy storage control circuit; wherein, in the case where the voltage sag does not occur on the first feeder, the first thyristor assembly remains turned on, the second thyristor assembly remains turned off, the main power supply supplies power to the power load through the first thyristor assembly and stores energy for the energy storage control circuit; controlling the standby power supply to turn on the second thyristor assembly and supply power to the power load through the second thyristor assembly.

[0110] In one of the embodiments, the processor further implements the following steps when executing the computer program:

[0111] controlling the energy storage control circuit to output a first electric signal; wherein the voltage value of the first electric signal is greater than the voltage value of the electric signal input by the main power supply to the first feeder.

[0112] In one of the embodiments, the processor further implements the following steps when executing the computer program:

[0113] controlling the energy storage control circuit to output a second electric signal; wherein the voltage value of the second electric signal is the same as the voltage value of the electric signal input by the standby power supply to the second feeder.

[0114] In one of the embodiments, the processor further implements the following steps when executing the computer program:

[0115] receiving a detection result of whether a voltage sag occurs on the second feeder; if the voltage sag occurs on the second feeder, controlling the energy storage control circuit to turn off the second thyristor assembly and supply power to the power load through the energy storage control circuit; controlling the main power supply to turn on the first thyristor assembly and supply power to the power load through the first thyristor assembly.

[0116] In one of the embodiments, the processor further implements the following steps when executing the computer program:

[0117] The energy storage control circuit outputs a third electric signal, wherein the voltage value of the third electric signal is greater than the voltage value of the electric signal input by the backup power supply to the second feeder; and / or the energy storage control circuit outputs a fourth electric signal, wherein the voltage value of the fourth electric signal is the same as the voltage value of the electric signal input by the main power supply to the first feeder.

[0118] In one of the embodiments, the first thyristor assembly and the second thyristor assembly each include a three-phase switching circuit, each phase switching circuit includes a plurality of switching units connected in series, each switching unit includes a group of anti-parallel thyristors and a voltage equalization circuit, and each phase switching circuit is connected with a power supply bus of a corresponding phase.

[0119] In one of the embodiments, the energy storage control circuit includes a three-phase control circuit, each phase control circuit includes a plurality of control units connected in series, each control unit includes a super capacitor, a converter and an IGBT module, four IGBT modules form an H-bridge structure, the AC side of the H-bridge structure is connected in series for output, and the DC side is connected with the super capacitor through the converter, and each phase control circuit is connected with a power supply bus of a corresponding phase.

[0120] In one of the embodiments, a computer readable storage medium is provided, and a computer program is stored on the computer readable storage medium, and the computer program is executed by a processor to implement the following steps:

[0121] The detection result of whether a voltage sag occurs on the first feeder is received, and if the voltage sag occurs on the first feeder, the energy storage control circuit is controlled to disconnect the first thyristor assembly, and the energy storage control circuit is controlled to supply power to the power load; in the case where the voltage sag does not occur on the first feeder, the first thyristor assembly is kept on, the second thyristor assembly is kept off, the main power supply supplies power to the power load through the first thyristor assembly, and the main power supply stores energy for the energy storage control circuit, and the backup power supply is controlled to turn on the second thyristor assembly to supply power to the power load through the second thyristor assembly.

[0122] In one of the embodiments, the computer program is executed by the processor to further implement the following steps:

[0123] The energy storage control circuit outputs a first electric signal, wherein the voltage value of the first electric signal is greater than the electric signal input by the main power supply to the first feeder.

[0124] In one of the embodiments, the computer program is executed by the processor to further implement the following steps:

[0125] The energy storage control circuit outputs a second electric signal, wherein the voltage value of the second electric signal is the same as the voltage value of the electric signal input by the backup power supply to the second feeder.

[0126] In one of the embodiments, the computer program is executed by the processor to further implement the following steps:

[0127] receive a detection result of whether a voltage sag occurs on the second feeder; if the voltage sag occurs on the second feeder, control the energy storage control circuit to turn off the second thyristor assembly, and supply power to the power load through the energy storage control circuit; and control the main power supply to turn on the first thyristor assembly, and supply power to the power load through the first thyristor assembly.

[0128] In one of the embodiments, the computer program, when executed by the processor, further implements the following steps:

[0129] control the energy storage control circuit to output a third electrical signal; wherein the voltage value of the third electrical signal is greater than the voltage value of the electrical signal input by the backup power supply to the second feeder; and / or control the energy storage control circuit to output a fourth electrical signal; wherein the voltage value of the fourth electrical signal is the same as the voltage value of the electrical signal input by the main power supply to the first feeder.

[0130] In one of the embodiments, the first thyristor assembly and the second thyristor assembly each include a three-phase switching circuit, and each phase switching circuit includes a plurality of switching units connected in series, and each switching unit includes a group of anti-parallel thyristors and a voltage balancing circuit, and each phase switching circuit is connected with a power supply bus of a corresponding phase.

[0131] In one of the embodiments, the energy storage control circuit includes a three-phase control circuit, and each phase control circuit includes a plurality of control units connected in series, and each control unit includes a super capacitor, a converter, and an IGBT module; wherein four IGBT modules form an H-bridge structure, the AC side of the H-bridge structure is connected in series for output, and the DC side is connected with the super capacitor through the converter; and each phase control circuit is connected with a power supply bus of a corresponding phase.

[0132] Those skilled in the art can understand that all or part of the processes in the above-mentioned embodiments can be completed by a computer program instructing related hardware. The computer program can be stored in a non-volatile computer readable storage medium. When the computer program is executed, it can include the processes of the above-mentioned embodiments. Any reference to memory, storage, database or other medium in the embodiments provided by the present application can include at least one of non-volatile and volatile memory. Non-volatile memory can include read-only memory (ROM), magnetic tape, floppy disk, flash memory or optical storage, etc. Volatile memory can include random access memory (RAM) or external cache memory. As an illustration but not limitation, RAM can be in various forms, such as static random access memory (SRAM) or dynamic random access memory (DRAM), etc.

[0133] Any combination of the technical features in the above embodiments can be made, and for the sake of brevity, not all possible combinations are described, however, any combination of the technical features should be considered as within the scope of the present disclosure, as long as the combination is not contradictory.

[0134] The above embodiments only express several implementation manners of the present application, and the description is relatively specific and detailed, but it should not be understood as a limitation on the patent scope of the present application. It should be pointed out that, for ordinary skilled persons in the art, some modifications and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the patent protection scope of the present application should be subject to the appended claims.

Claims

1. A method of voltage compensation for a power distribution network, characterized by, The application is applied to a voltage compensation system, the voltage compensation system comprises a voltage compensation circuit, the voltage compensation circuit comprises a first thyristor assembly, a second thyristor assembly and an energy storage control circuit, one end of the first thyristor assembly is connected with a first feeder of a power distribution network, the first feeder is connected with a main power supply, one end of the second thyristor assembly is connected with a second feeder of the power distribution network, the second feeder is connected with a backup power supply, the other end of the first thyristor assembly, the other end of the second thyristor assembly and the energy storage control circuit are connected with a power supply bus of the power distribution network, the power supply bus is connected with an electric load, and the method comprises: receiving a detection result of whether a voltage sag occurs on the first feeder; if the voltage sag occurs on the first feeder, controlling the energy storage control circuit to output a first electric signal, the voltage value of the first electric signal is greater than the voltage value of an electric signal input by the main power supply to the first feeder, so that the energy storage control circuit replaces the main power supply to supply power to the electric load, the current output by the main power supply is 0, and the first thyristor assembly is controlled to be disconnected; wherein, the first thyristor assembly can be disconnected only when the input current is 0, in the case where the voltage sag does not occur on the first feeder, the first thyristor assembly remains to be turned on, the second thyristor assembly remains to be disconnected, the main power supply supplies power to the electric load through the first thyristor assembly, and stores energy for the energy storage control circuit; after controlling the energy storage control circuit to output a second electric signal, controlling the backup power supply to turn on the second thyristor assembly, and supplying power to the electric load through the second thyristor assembly; wherein, the voltage value of the second electric signal is the same as the voltage value of an electric signal input by the backup power supply to the second feeder.

2. The method of claim 1, wherein, in the case where the backup power supply supplies power to the electric load through the second thyristor assembly, the method further comprises: receiving a detection result of whether a voltage sag occurs on the second feeder; if the voltage sag occurs on the second feeder, controlling the energy storage control circuit to disconnect the second thyristor assembly, and supplying power to the electric load through the energy storage control circuit; controlling the main power supply to turn on the first thyristor assembly, and supplying power to the electric load through the first thyristor assembly.

3. The method of claim 2, wherein, the controlling the energy storage control circuit to disconnect the second thyristor assembly comprises: controlling the energy storage control circuit to output a third electric signal; wherein, the voltage value of the third electric signal is greater than the voltage value of an electric signal input by the backup power supply to the second feeder; and / or before the controlling the main power supply to turn on the first thyristor assembly, the method further comprises: controlling the energy storage control circuit to output a fourth electric signal; wherein, the voltage value of the fourth electric signal is the same as the voltage value of an electric signal input by the main power supply to the first feeder.

4. The method according to any one of claims 1 to 3, characterized in that, The first thyristor assembly and the second thyristor assembly each comprise a three-phase switching circuit, each phase switching circuit comprising a plurality of switching units connected in series, each switching unit comprising a group of anti-parallel thyristors and a voltage equalization circuit, and each phase switching circuit being connected to a power supply bus of a corresponding phase.

5. The method according to any one of claims 1 to 3, characterized in that, The energy storage control circuit comprises three-phase control circuits, each phase control circuit comprising a plurality of control units connected in series, each control unit comprising a super capacitor, a converter and an IGBT module; wherein four IGBT modules form an H-bridge structure, the AC side of the H-bridge structure is connected in series for output, and the DC side is connected to the super capacitor through the converter; and each phase control circuit is connected to a power supply bus of a corresponding phase.

6. A voltage compensation system, characterized by, The voltage compensation system comprises a control system and a voltage compensation circuit, the voltage compensation circuit comprising a first thyristor assembly, a second thyristor assembly and an energy storage control circuit, one end of the first thyristor assembly being connected to a first feeder of a power distribution network, the first feeder being connected to a main power supply, one end of the second thyristor assembly being connected to a second feeder of the power distribution network, the second feeder being connected to a backup power supply, the other end of the first thyristor assembly, the other end of the second thyristor assembly and the energy storage control circuit being connected to a power supply bus of the power distribution network, the power supply bus being connected to an electrical load, and the control system comprising: a result receiving module configured to receive a detection result of whether a voltage sag occurs on the first feeder; a switch opening module configured to, in the case that a voltage sag occurs on the first feeder, control the energy storage control circuit to output a first electrical signal, the voltage value of the first electrical signal being greater than the voltage value of an electrical signal input by the main power supply to the first feeder, so that the energy storage control circuit replaces the main power supply to supply power to the electrical load, the current output by the main power supply being 0, and the first thyristor assembly being controlled to be opened; wherein, in the case that no voltage sag occurs on the first feeder, the first thyristor assembly remains turned on, the second thyristor assembly remains opened, the main power supply supplies power to the electrical load through the first thyristor assembly, and the energy storage control circuit stores energy; a switch closing module configured to, after the energy storage control circuit outputs a second electrical signal, control the energy storage control circuit to turn on the second thyristor assembly, and the backup power supply supplies power to the electrical load through the second thyristor assembly; wherein the voltage value of the second electrical signal is the same as the voltage value of an electrical signal input by the backup power supply to the second feeder.

7. The system of claim 6, wherein, The result receiving module is further configured to receive a detection result of whether a voltage sag occurs on the second feeder; and the switch opening module is further configured to, if a voltage sag occurs on the second feeder, control the energy storage control circuit to open the second thyristor assembly and supply power to the electrical load through the energy storage control circuit; and the switch closing module is further configured to control the main power supply to turn on the first thyristor assembly and supply power to the electrical load through the first thyristor assembly.

8. The system of claim 7, wherein, The switch-off module is further configured to control the energy storage control circuit to output a third electric signal, wherein a voltage value of the third electric signal is greater than a voltage value of an electric signal inputted by the backup power supply to the second feeder; and / or control the energy storage control circuit to output a fourth electric signal, wherein a voltage value of the fourth electric signal is the same as a voltage value of an electric signal inputted by the main power supply to the first feeder. 9.A computer device, comprising a memory and a processor, wherein the memory stores a computer program, and the computer device is configured to perform the method according to any one of claims 1-8 when the computer program is executed by the processor. The computer program, when executed by the processor, implements the steps of the method of any one of claims 1 to 5.

10. A computer-readable storage medium having stored thereon a computer program, characterized in that, The computer program, when executed by the processor, implements the steps of the method of any one of claims 1 to 5.

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