Substation bus voltage loss self-healing system under string supply operation mode

Abstract

The application provides a substation bus voltage loss post-station self-healing system under string supply operation mode, based on a model service module, a real-time service module, a power flow calculation module and a state estimation module of a dispatching monitoring system IES700, the station self-healing system is used for obtaining a station self-healing model from the model service module, subscribing to out-of-limit information of telemetry, remote signaling, protection signals and power flow calculation from the real-time service, and performing comprehensive analysis and judgment; when a line fault occurs, the station self-healing system sends information to a UAV interactive interface through a pipeline, a remote control sequence scheme is popped up by the UAV interactive interface, and the line is rapidly restored to power; the application of the technical scheme can comprehensively and timely reflect the power grid operation condition, timely find the power grid fault, rapidly judge and operate the power restoration.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of dispatch automation, in particular to a substation interconnection self-healing system after bus voltage loss in series supply operation mode. BACKGROUND

[0002] When a series supply substation at a power supply point loses voltage due to loss of power supply line, the switch corresponding to the power supply line is tripped, and the switch of the series connection line between the series supply substation and a non-series supply substation is closed, so that the non-series supply substation supplies power to the current series supply substation that loses voltage.

[0003] For the problem of substation voltage loss in series supply operation mode, there are two traditional solutions. One is that the dispatchers determine the fault point through remote signaling and remote measurement information at the substation end, and manually order operation to restore power supply. However, this method requires manual experience and operation, and in complex situations, it is easy to miss and make mistakes, making the timeliness poor and causing load loss. The other is to add a set of interconnection self-restoration devices of the same type at both substation sides, which have mutual communication function between the two sets, and realize fault judgment and power restoration through information interaction. However, this method requires the installation of hardware devices, which is limited by space and optical fiber communication channels. When the communication channel fails, the interconnection self-restoration function cannot be realized. In addition, when the substation or line is planned and constructed in the long term, the interconnection self-restoration device is no longer needed in the normal operation mode, and the device cannot be reused, resulting in waste of investment and low return on investment. SUMMARY

[0004] Therefore, the present application aims to provide a substation interconnection self-healing system after bus voltage loss in series supply operation mode, which can comprehensively and timely reflect the operation state of the power grid, discover faults in the power grid, and quickly judge and operate to restore power supply.

[0005] To achieve the above-mentioned purpose, the present application adopts the following technical solution: a substation interconnection self-healing system after bus voltage loss in series supply operation mode, based on the model service module, real-time service module, power flow calculation module and state estimation module of the dispatching monitoring system IES700, the interconnection self-healing system is used to obtain the interconnection self-healing model from the model service module, subscribe to the over-limit information of remote measurement, remote signaling, protection signal and power flow calculation from the real-time service, and perform comprehensive analysis and judgment; the interconnection self-healing system is connected to the real-time database and the historical database; the interconnection self-healing system transmits real-time data to the historical database, and the historical database transmits the loss of load to the power flow calculation module; the interconnection self-healing system and the historical database transmit historical schemes; when a line fault occurs, the interconnection self-healing system sends information to the unmanned aerial vehicle interactive interface through the pipeline, and the unmanned aerial vehicle interactive interface pops up a remote control sequence scheme to realize rapid power restoration of the line.

[0006] In a preferred embodiment, the inter-station self-recovery strategy supports manual customization, and the inter-station self-recovery strategy includes charging conditions, discharging conditions, action conditions, and locking conditions; the charging conditions refer to what operating state the strategy can take effect, the charging is completed after 15s of meeting the charging conditions, and the state is in a standby start state; the discharging conditions refer to what condition exits the standby start state; the action conditions refer to what condition starts the strategy to perform switch action to eliminate the fault influence under the condition of meeting the charging conditions and the charging full state; the locking conditions refer to setting a locking signal, and the strategy is not executed when the locking signal is in action, and the purpose of setting the locking conditions is to prevent the strategy from being executed, that is, the execution may cause other faults.

[0007] In a preferred embodiment, the inter-station self-recovery system supports real-time monitoring of the inter-station self-recovery strategy, supports monitoring whether the strategy is in a working state, supports predicting the power flow situation after the action through power flow calculation, and judges whether there is an out-of-limit information; the inter-station self-recovery strategy supports load switching switches, and the load switching switches are configured into an action queue; the load switching switches are applied in the case that there is an out-of-limit situation after the strategy is executed, and the load switching switches are used to avoid equipment out-of-limit.

[0008] In a preferred embodiment, when the charging conditions are met and the charging is completed, if the power supply line of the series supply substation loses voltage, the backup of the non-series supply substation is in action, the system judges that the bus of the series supply substation loses voltage and the bus of the non-series supply substation has voltage, and the series line between the two stations has no current, then the self-recovery strategy is in action, after a delay, the loss voltage power supply line switch of the series supply substation is tripped, the series line switch of the non-series supply substation is closed, and the bus of the series supply substation restores normal voltage.

[0009] In a preferred embodiment, the overload calculation is completed through the power flow calculation service; after the scheme is generated, the network backup service waits for a period of time, waits for the state estimation calculation to be completed, and sends a backup action scheme calculation command to the power flow calculation service; after receiving the command, the power flow service obtains the state estimation data section, simulates the backup action scheme, finds the bus that will be powered on again, obtains the size of the load carried by the bus before the bus loses power from the time sequence library, and calculates the power flow to check the overload of the equipment.

[0010] Compared with the prior art, the application has the following beneficial effects: 1. The fault can be automatically judged and the power supply can be quickly restored by the software program, without manual operation, and without causing load loss; 2. The inter-station self-healing system can be applied to the transformer substations in the same string supply operation mode, only the strategy needs to be increased, without the need to increase the hardware equipment, and when the wiring mode is perfect and the inter-station backup power supply is not needed, the strategy can be directly cancelled, which is convenient and fast, and the investment return rate is high; 3. The basic data used by the inter-station self-healing system are all sent in real time by the remote machine of the transformer substation end to the dispatching and monitoring IES700 system, which can comprehensively and real-timely reflect the power grid operation condition, discover the power grid fault in time, and quickly judge and operate the power supply restoration; 4. The inter-station self-healing system can be applied to multiple transformer substations in the string supply operation mode by the strategy arrangement, without repeated investment in hardware construction. BRIEF DESCRIPTION OF DRAWINGS

[0011] Fig. 1 The inter-station self-healing backup power supply data flow diagram of the preferred embodiment of the application;

[0012] Fig. 2 The inter-station self-healing module interaction architecture diagram of the preferred embodiment of the application;

[0013] Fig. 3 The system overall architecture diagram of the preferred embodiment of the application. DETAILED DESCRIPTION

[0014] The application will be further described below in combination with the drawings and embodiments.

[0015] It should be noted that the following detailed description is all exemplary and is intended to provide further explanation of the present application. Unless otherwise specified, all technical and scientific terms used herein have the same meaning as generally understood by those skilled in the art to which the present application belongs.

[0016] It should be noted that the terms used herein are only for the purpose of describing the specific embodiments, and are not intended to limit the exemplary embodiments according to the present application; as used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form, and furthermore, it should be understood that when the terms "comprise" and / or "include" are used in the specification, they mean that the features, steps, operations, devices, components and / or combinations thereof are present.

[0017] An inter-station self-healing system after the bus voltage loss of a transformer substation in a string supply operation mode, with reference to Figs. 1 to 3, based on the model service module, real-time service module, power flow calculation module and state estimation module of the dispatching monitoring system IES700, the inter-station self-healing system is used to acquire the inter-station self-healing model from the model service module, subscribe to the out-of-limit information of telemetry, remote signaling, protection signal and power flow calculation from the real-time service, and perform comprehensive analysis and judgment; the inter-station self-healing system is connected with the real-time database and the historical database; the inter-station self-healing system transmits real-time data to the historical database, and the historical database transmits the loss load to the power flow calculation module; the historical scheme is transmitted between the inter-station self-healing system and the historical database; when a line fault occurs, the inter-station self-healing system sends information to the unmanned aerial vehicle interactive interface through a pipeline, and the unmanned aerial vehicle interactive interface pops up a remote control sequence scheme to realize the rapid power restoration of the line.

[0018] The inter-station self-healing strategy supports manual customization, and the inter-station self-healing strategy includes charging conditions, discharging conditions, action conditions and locking conditions; the charging condition refers to the operating state in which the strategy can take effect, the charging is completed after 15s of meeting the charging condition, and the state is in a standby start state; the discharging condition refers to the condition under which the standby start state is exited; the action condition refers to that under the condition of meeting the charging condition and the charging full state, what condition is met to start the strategy to perform switch action to eliminate the fault influence; the locking condition refers to setting a locking signal, and the strategy is not executed when the locking signal acts, and the purpose of setting the locking condition is to prevent the strategy from being executed, that is, the execution may cause other faults.

[0019] The inter-station self-healing system supports real-time monitoring of the inter-station self-healing strategy, supports monitoring whether the strategy is in a working state, supports predicting and calculating the power flow after the action through power flow calculation, and judges whether there is out-of-limit information; the inter-station self-healing strategy supports the switching of loads, and the switching of switches is configured into an action queue; the switching of loads is applied to the case that there is out-of-limit information after the strategy is executed, and the switching of loads is used to avoid equipment out-of-limit.

[0020] When the charging condition is met and the charging is completed, if the power supply line of the series supply substation loses voltage, the backup power supply of the non-series supply substation acts, the system judges that the bus of the series supply substation loses voltage and the bus of the non-series supply substation has voltage, and the series line between the two stations has no current, then the self-healing strategy acts, after a delay, the loss voltage power supply line switch of the series supply substation is tripped, the series line switch of the non-series supply substation is closed, and the bus of the series supply substation restores normal voltage.

[0021] The overload calculation is assisted by the power flow calculation service; after the scheme is generated, the network backup power supply service waits for a period of time, waits for the state estimation calculation to be completed, and sends a backup power supply action scheme calculation command to the power flow calculation service; after receiving the command, the power flow service acquires the state estimation data section, simulates the backup power supply action scheme, finds the bus that will be powered on again, acquires the size of the load carried by the bus before the bus loses power from the time sequence library, and calculates the power flow to check the overload of the equipment.

[0022] Periodic scanning of the whole network, considering the device function total input state, whether it is adaptive backup, power grid operation mode, backup charging and discharging conditions and other factors to generate the whole network backup operation state. Based on state analysis, the backup action scheme is generated. For the function input, the backup operation mode is checked whether the action condition is met, and the mode is put into the action scheme generation thread for delay, verification, scheme generation and other operations. Calculate whether the network backup action scheme is overloaded. If it is overloaded, the scheme is cancelled and the network backup is discharged. Considering the functional characteristics of the backup, the system has the function of automatic execution of the network backup action scheme. The system can respond to the one-key execution command issued by the man-machine and automatically complete the batch remote control operation of the scheme.

[0023] The scheme proposes a construction scheme for the inter-station self-healing system, that is, adding an inter-station self-healing system to the dispatching master station without increasing hardware devices, only through a software system, to realize the inter-station backup function. Compared with the traditional two methods, this scheme has the following advantages: first, it can automatically judge the fault and quickly restore power through software program without manual operation, which will not cause load loss; second, the inter-station self-healing system can be applied to substations with the same string supply operation mode, only the strategy needs to be increased, without increasing hardware devices, and when the wiring mode is perfect and does not need inter-station backup, the strategy can be directly cancelled, which is convenient and fast, with high return on investment. Third, the basic data used by the inter-station self-healing system are all sent in real time from the substation end to the dispatching and monitoring IES700 system through the remote machine, which can fully and timely reflect the power grid operation state, discover power grid faults, and quickly judge and operate the power restoration. Fourth, the inter-station self-healing system can be applied to multiple string supply operation mode substations through strategy arrangement, without repeated investment in hardware construction.

[0024] The inter-station self-healing backup function is based on the existing IES700 system. The IES700 system platform currently supports the modeling of the inter-station self-healing backup, and the model storage remains consistent with the platform. The inter-station self-healing backup operation control service is used to load the whole network model and backup model, subscribe to real-time data from the real-time service, monitor the backup state in real time, and generate control schemes according to the backup action logic. The existing man-machine function is expanded, and the backup information display page, real-time action scheme and historical scheme query page are added to support the man-machine interaction function of the network backup.

Claims

1. A self-healing system between substations after busbar voltage loss in a series power supply operation mode, based on the model service module, real-time service module, power flow calculation module, and state estimation module of the IES700 dispatching and monitoring system, characterized in that, The inter-station self-healing system is used to acquire inter-station self-healing models from the model service module, subscribe to telemetry, tele-signaling, protection signals, and power flow calculation over-limit information from real-time services, and perform comprehensive analysis and judgment. The inter-station self-healing system connects to the real-time database and the historical database. The inter-station self-healing system transmits real-time data to the historical database, and the historical database transmits lost loads to the power flow calculation module. The inter-station self-healing system and the historical database transmit historical schemes. When a line fault occurs, the inter-station self-healing system sends information to the UAV interactive interface through a pipeline. The UAV interactive interface then displays a remote control sequence scheme to achieve rapid power restoration of the line. The inter-station self-healing strategy supports manual customization. The inter-station self-healing strategy includes charging conditions, discharging conditions, action conditions, and interlocking conditions. The charging conditions refer to the operating conditions under which the strategy can take effect. After the charging conditions are met, charging is completed in 15 seconds and the station is in a ready-to-start state. Discharge condition refers to the circumstances under which the system exits the standby state; action condition refers to the conditions under which the strategy is activated to perform a switching action to eliminate the impact of the fault, provided that the charging condition is met and the system is fully charged; lockout condition refers to setting a lockout signal, which prevents the strategy from being executed when the lockout signal is activated. The purpose of setting a lockout condition is to prevent the strategy from being executed, i.e., to prevent other faults from occurring after execution. The inter-station self-healing system supports real-time monitoring of inter-station self-healing strategies, monitors whether the strategies are in working condition, and predicts the power flow situation after the calculation actions through power flow calculation to determine whether there is any limit violation information. The inter-station self-healing strategy supports the joint switching of load switches, which can be configured into the action queue. The joint switching of load switches is used when there is a limit violation after the strategy is executed, and the equipment limit violation is avoided by the joint switching of load switches. When the charging conditions are met and charging is completed, if the power supply line of the series power supply substation loses voltage, and the backup automatic transfer of the non-series power supply substation is activated, the system will collect and determine that the busbars of the series power supply substations are all under voltage, while the busbars of the non-series power supply substations are all under voltage, and there is no current in the series lines of the two stations. Then the self-healing strategy will activate, and after a delay, the undervoltage power supply line switch of the series power supply substation will be tripped, and the series line switch of the non-series power supply substation will be closed, so that the busbars of the series power supply substations will be restored to normal voltage. Overload calculation is completed with the assistance of power flow calculation service; after the scheme is generated, the network backup service waits for a period of time to wait for the state estimation calculation to be completed, and then sends a backup action scheme calculation command to the power flow calculation service; after receiving the command, the power flow service obtains the state estimation data section, simulates the backup action scheme, finds the bus that will be re-energized, obtains the load size of the bus before the power loss from the time series library, calculates the power flow, and checks the equipment overload situation.

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