CN113395017A - Pumped-storage system, control method and storage medium - Google Patents

Pumped-storage system, control method and storage medium Download PDF

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Publication number
CN113395017A
CN113395017A CN202110668373.6A CN202110668373A CN113395017A CN 113395017 A CN113395017 A CN 113395017A CN 202110668373 A CN202110668373 A CN 202110668373A CN 113395017 A CN113395017 A CN 113395017A
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China
Prior art keywords
control circuit
relay
circuit
trip
control
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Granted
Application number
CN202110668373.6A
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Chinese (zh)
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CN113395017B (en
Inventor
汪志强
彭煜民
张学峰
周海燕
陈满
李尧
贺儒飞
李德华
胡振恺
王文辉
张豪
王方
李晓春
侯宝生
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Peak and Frequency Regulation Power Generation Co of China Southern Power Grid Co Ltd
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Peak and Frequency Regulation Power Generation Co of China Southern Power Grid Co Ltd
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Priority to CN202110668373.6A priority Critical patent/CN113395017B/en
Publication of CN113395017A publication Critical patent/CN113395017A/en
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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
    • H02P1/00—Arrangements for starting electric motors or dynamo-electric converters
    • H02P1/02—Details
    • H02P1/022—Security devices, e.g. correct phase sequencing
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
    • H02H7/06—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for dynamo-electric generators; for synchronous capacitors
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E10/00—Energy generation through renewable energy sources
    • Y02E10/20—Hydro energy
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/16—Mechanical energy storage, e.g. flywheels or pressurised fluids

Abstract

The application relates to a pumped storage system, a control method and a storage medium, which are suitable for the technical field of pumped storage units. The pumped storage system comprises a static frequency converter, a power-off tripping relay and a plurality of pumped storage units which are sequentially connected in series, each pumped storage unit comprises a working circuit and a tripping circuit, each tripping circuit comprises a first control circuit, a first relay and a second relay, and the first relay and the second relay are connected in parallel; the static frequency converter is used for providing current for a stator in a working circuit in the pumped storage unit; each first control circuit is used for controlling the normally closed contacts of a first relay and a second relay in a tripping circuit where the first control circuit is located to be disconnected under the condition that the pumped storage unit where the first control circuit is located is abnormal in the dragging and starting process of the SFC, so that the SFC is triggered to trip and stop operation after the power-off tripping relay is powered off. The pumped storage system can ensure the tripping of the static frequency converter and timely trip, and avoid the expansion of equipment accidents.

Description

Pumped-storage system, control method and storage medium
Technical Field
The application relates to the technical field of pumped storage units, in particular to a pumped storage system, a control method and a storage medium.
Background
In a pumped storage system, a static frequency converter (hereinafter referred to as SFC) is connected to a plurality of pumped storage units through a starting bus and a plurality of switch disconnecting links, as shown in fig. 1. When the pumped storage unit is started in the pumping direction, a Static Frequency Converter (SFC) is needed to provide current with gradually rising frequency for a stator in the pumped storage unit so as to drag a rotor in the pumped storage unit to rise. When the pumped storage unit has an accident, the SFC needs to be jumped in a combined mode at the first time, so that the SFC stops providing variable frequency current for the stator of the pumped storage unit, and the safety of equipment is ensured.
In the prior art, the trip circuits of a plurality of pumped storage units in a pumped storage system are connected in parallel and then connected to the power-on trip relay corresponding to the SFC. In the trip circuit of each pumped storage unit, the first relay is connected in series with the normally open contact of the second relay, as shown in fig. 2. And in the electrified state of the second relay, the pumped storage unit is in a state of being dragged by the SFC. When a certain pumped storage unit is dragged by the SFC, the normally open contact of the second relay is closed, and the second relay is electrified. In the process that a certain pumped storage unit is dragged and started by the SFC, when a tripping signal occurs to the pumped storage unit, the normally open contact of the first relay is closed, and the first relay is electrified, so that the power-on tripping relay connected with the SFC in series is powered on, and the static frequency converter is triggered to trip and stop running.
In the system, as a plurality of pumped storage units are converged into one point in a parallel connection mode and connected to the power-on tripping relay, once a terminal of the convergence point is loosened or the power-on tripping relay fails, all the units cannot jump in series with the SFC, and equipment accidents are possibly expanded.
Disclosure of Invention
Therefore, it is necessary to provide a pumped storage system, a control method and a storage medium for solving the above technical problems, which can ensure timely tripping of the stationary frequency converter and avoid expansion of equipment accidents.
In a first aspect, a pumped storage system is provided, which comprises a static frequency converter, a power-off tripping relay and a plurality of pumped storage units which are sequentially connected in series, wherein each pumped storage unit comprises a working circuit and a tripping circuit, each tripping circuit comprises a first control circuit, a first relay and a second relay, and the first relay and the second relay are connected in parallel; the static frequency converter is used for providing current for stators in working circuits in the pumped storage units; each first control circuit is used for controlling the normally closed contacts of a first relay and a second relay in a tripping circuit where the first control circuit is located to be disconnected under the condition that the pumped storage unit where the first control circuit is located is abnormal in the dragging and starting process of the SFC, so that the SFC is triggered to trip and stop operation after the power-off tripping relay is powered off.
In one embodiment, each trip circuit further comprises a second control circuit and a third relay, the second control circuit in the same trip circuit is connected in communication with the first control circuit, and the third relay is connected in parallel with the second relay after being connected in series with the first relay, wherein: each first control circuit is used for sending a first control signal to a second control circuit in communication connection with the first control circuit when the pumped storage unit where the first control circuit is located is dragged by the SFC to start, wherein the first control signal is used for indicating the second control circuit to control a normally closed contact of a third relay in a tripping circuit where the second control circuit is located to be disconnected; and the second control circuit is used for controlling a normally closed contact of a third relay in a tripping circuit where the second control circuit is located to be opened after receiving the first control signal, so that the SFC is triggered to trip and shut down after the power failure tripping relay loses power.
In one embodiment, each trip circuit further comprises a monitoring device coupled to the first control circuit and the second control circuit, wherein:
each monitoring device is used for sending an abnormal signal to a first control circuit and a second control circuit which are connected with the monitoring device when detecting that the pumped storage unit where the monitoring device is located is abnormal in the dragging and starting process of the pumped storage unit by the SFC, wherein the abnormal signal is used for representing that the pumped storage unit where the monitoring device is located is abnormal in the dragging and starting process of the pumped storage unit by the SFC;
each first control circuit is used for controlling a first relay and a second relay in a tripping circuit where the first control circuit is located to be normally closed and disconnected after receiving an abnormal signal sent by monitoring equipment connected with the first control circuit, and sending a first control signal to a second control circuit in communication connection with the first control circuit;
and the second control circuit is used for controlling a normally closed contact of a third relay in a tripping circuit where the second control circuit is located to be opened after receiving the abnormal signal, so that the SFC is triggered to trip and stop after the power-off tripping relay is powered off.
In one embodiment, the pumped-hydro energy storage system further includes a third control circuit and a fourth relay, the fourth relay being connected in series with the trip circuit in each pumped-hydro energy storage group, the third control circuit being communicatively connected to each first control circuit, wherein: each first control circuit is used for sending a second control signal to a third control circuit when the pumped storage unit where the first control circuit is located is abnormal in the dragging and starting process of the SFC, and the second control signal is used for indicating the third control circuit to control the normally closed contact of the fourth relay to be disconnected; and the third control circuit is used for controlling the normally closed contact of the fourth relay to be opened after receiving the second control signal, so that the SFC is triggered to trip and stop after the power-off tripping relay loses power.
In one embodiment, each first control circuit is further configured to control a second relay in the trip circuit where the first control circuit is located to close when the pumped storage unit where the first control circuit is located is not in the process of being dragged and started by the SFC and the first relay in the trip circuit where the first control circuit is located is abnormally closed.
In one embodiment, each first control circuit is further configured to control a second relay in the trip circuit where the first control circuit is located to close when the pumped storage unit where the first control circuit is located is not in the process of being dragged and started by the SFC and a third relay in the trip circuit where the first control circuit is located is abnormally closed.
In a second aspect, a pumped storage system control method is provided, which is applied to a pumped storage system, the pumped storage system includes a static frequency converter, a power-off tripping relay and a plurality of pumped storage groups, which are sequentially connected in series, each pumped storage group includes a working circuit and a tripping circuit, each tripping circuit includes a first control circuit, a first relay and a second relay, wherein the first relay and the second relay are connected in parallel, and the method includes: the static frequency converter provides current for working circuits in the pumped storage units;
under the condition that the pumped storage unit where the first control circuit is located is abnormal in the dragging and starting process of the SFC, the first control circuit controls a first relay and a second relay normally-closed contact in a tripping circuit where the first control circuit is located to be disconnected, so that the SFC is triggered to trip and stop operation after the power failure tripping relay loses power.
In one embodiment, each trip circuit further comprises a second control circuit and a third relay, the second control circuit in the same trip circuit is communicatively connected to the first control circuit, and the third relay is connected in parallel with the second relay after being connected in series with the first relay, the method further comprising: under the condition that a pumped storage unit where a first control circuit is located is abnormal in the dragging and starting process of an SFC, the first control circuit sends a first control signal to a second control circuit which is in communication connection with the first control circuit, and the first control signal is used for indicating the second control circuit to control a normally closed contact of a third relay in a tripping circuit where the second control circuit is located to be disconnected; after receiving the first control signal, the second control circuit controls a normally closed contact of a third relay in a tripping circuit where the second control circuit is located to be opened, so that the SFC is triggered to trip and stop after the power-off tripping relay is powered off.
In one embodiment, the pumped-hydro energy storage system further comprises a third control circuit and a fourth relay, the fourth relay is connected in series with the trip circuit in each pumped-hydro energy storage group, the third control circuit is communicatively connected with each first control circuit, and the method further comprises: under the condition that the pumped storage unit where the first control circuit is located is abnormal in the dragging and starting process of the SFC, each first control circuit sends a second control signal to the third control circuit, and the second control signal is used for indicating the third control circuit to control the normally closed contact of the fourth relay to be disconnected; and after receiving the second control signal, the third control circuit controls the normally closed contact of the fourth relay to be opened so as to trigger the SFC to trip and stop operation after the power-off tripping relay is powered off.
In a third aspect, a computer-readable storage medium is provided, on which a computer program is stored, which, when being executed by a processor, implements the method for controlling a pumped-hydro energy storage system according to any one of the second aspect.
According to the pumped storage system, the control method and the storage medium, the pumped storage system comprises the static frequency converter, the power-off tripping relay and the pumped storage units which are sequentially connected in series, each pumped storage unit comprises the working circuit and the tripping circuit, each tripping circuit comprises the first control circuit, the first relay and the second relay, and the first relay and the second relay are connected in parallel. And the static frequency converter is used for providing current for the working circuit in each pumped storage unit. Each first control circuit is used for controlling the normally closed contacts of a first relay and a second relay in a tripping circuit where the first control circuit is located to be disconnected under the condition that the pumped storage unit where the first control circuit is located is abnormal in the dragging and starting process of the SFC, so that the SFC is triggered to trip and stop operation after the power-off tripping relay is powered off. Under the condition that the pumped storage unit is dragged by the SFC to be started abnormally, the first control circuit controls the normally closed contacts of the first relay and the second relay in the tripping circuit where the first control circuit is located to be disconnected, and therefore the tripping circuit is disconnected. Under the condition that the tripping circuit is disconnected, no current passes through the power-losing tripping relay, the normally closed contact of the power-losing tripping relay is closed after the power-losing tripping relay loses power, the joint tripping loop of the static frequency converter is conducted, the static frequency converter is triggered to trip and stop operation, and the safety of the pumped storage system is ensured.
Drawings
FIG. 1 is a schematic diagram of a pumped-hydro energy storage system of the prior art;
FIG. 2 is a schematic diagram of a pumped storage unit joint-tripping SFC parallel circuit in the prior art
FIG. 3 is a schematic diagram of a pumped-hydro energy storage system according to an embodiment;
FIG. 4 is a schematic diagram of a pumped-hydro energy storage system according to one embodiment;
FIG. 5 is a schematic diagram of a pumped-hydro energy storage system according to one embodiment;
FIG. 6 is a schematic diagram of a pumped-hydro energy storage system according to one embodiment;
FIG. 7 is a schematic flow chart of a pumped-hydro energy storage system control method in another embodiment;
FIG. 8 is a schematic flow chart of a pumped-hydro energy storage system control method according to another embodiment;
fig. 9 is a flow chart illustrating a pumped-hydro energy storage system control method according to another embodiment.
Detailed Description
In order to make the aforementioned objects, features and advantages of the present application more comprehensible, embodiments accompanying the present application are described in detail below with reference to the accompanying drawings. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present application. This application is capable of embodiments in many different forms than those described herein and that modifications may be made by one skilled in the art without departing from the spirit and scope of the application and it is therefore not intended to be limited to the specific embodiments disclosed below.
In the pumped storage system, a plurality of pumped storage units are connected in parallel and then connected in series with a Static Frequency Converter (SFC). When the pumped storage unit is started, the SFC is adopted to provide current with gradually rising frequency for a stator in the pumped storage unit so as to drag a rotor in the pumped storage unit to rise. When the pumped storage unit has an accident, the SFC needs to be jumped in a combined mode at the first time, so that the SFC stops supplying power to the pumped storage unit, and the safety of equipment is ensured.
However, if a plurality of trip circuits of the pumped storage unit are converged into one point in a parallel connection mode and connected to the power-on trip relay, once a terminal of the convergence point is loosened or a fault of the trip relay is obtained, all the units cannot jump in series with the SFC, and an equipment accident may be enlarged.
In view of the above technical problems, the technical solutions of the present application and how to solve the technical problems will be described in detail with specific embodiments below. The following several specific embodiments may be combined with each other, and details of the same or similar concepts or processes may not be repeated in some embodiments. Embodiments of the present application will be described below with reference to the accompanying drawings.
The numbering of the components as such, e.g., "first", "second", etc., is used herein only to distinguish the objects as described, and does not have any sequential or technical meaning. The term "connected" and "coupled" when used in this application, unless otherwise indicated, includes both direct and indirect connections (couplings).
In one embodiment of the present application, as shown in fig. 3, there is provided a pumped-hydro energy storage system 10, the pumped-hydro energy storage system 10 includes a static frequency converter 11, a power-loss trip relay 12, and a plurality of pumped-hydro energy storage groups 13, which are sequentially connected in series, each pumped-hydro energy storage group 13 includes a working circuit 131 and a trip circuit 132, each trip circuit 132 includes a first control circuit 1321, a first relay 1322 and a second relay 1323, wherein the first relay 1322 and the second relay 1323 are connected in parallel;
and the static frequency converter 11 is used for supplying current to the stator in the working circuit 131 in each pumped storage unit 13.
The static frequency converter 11 is a power electronic power supply device capable of providing simultaneous frequency and voltage changes, and can be classified into an indirect static frequency converter and a direct static frequency converter. The indirect static frequency converter rectifies a power frequency alternating current power supply into direct current with controllable voltage, and converts the direct current into variable frequency alternating current through an inverter, so the indirect static frequency converter is also called as an alternating current-direct current-alternating current frequency converter. The direct static frequency converter converts the power frequency alternating current into variable frequency alternating current in a one-time mode, so the direct static frequency converter can be called an alternating-alternating frequency converter. Indirect frequency converters are widely used.
Specifically, when the pumped storage unit is working normally, the static frequency converter 11 may provide a current with a gradually increasing frequency to the stator in the pumped storage unit 13 to drag the rotor in the pumped storage unit to increase the speed, so that the pumped storage unit 13 works normally.
Each first control circuit 1321 is configured to, when an abnormality occurs in the process that the pumped storage unit 13 where the first control circuit 1321 is located is dragged by the SFC to start, control the normally closed contacts of the first relay 1322 and the second relay 1323 in the trip circuit 132 where the first control circuit 1321 is located to be opened, so that the SFC is triggered to trip and stop after the power failure of the power failure trip relay 12.
Specifically, the first control circuit 1321 may detect the operating condition of the pumped storage unit 13 in real time, and when detecting that an abnormality occurs during the process of dragging and starting the pumped storage unit 13 in which the first control circuit 1321 is located by the SFC, the first control circuit 1321 may control the normally closed contacts of the first relay 1322 and the second relay 1323 in the trip circuit 132 in which the first control circuit 1321 is located to be opened, so as to open the trip circuit 132. When the trip circuit 132 is switched off, no current passes through the power-off trip relay 12, and the normally closed contact is switched off after the power-off trip relay 12 is powered off, so that the joint tripping of the static frequency converter 11 is realized, and the safety of the pumped storage system 10 is ensured.
In the pumped-storage system 10 provided in the embodiment of the present application, the static frequency converter 11 is configured to provide current to the working circuit 131 in each pumped-storage unit. Each first control circuit 1321 is configured to, when an abnormality occurs in the process that the pumped storage unit where the first control circuit 1321 is located is dragged and started by the SFC, control the normally closed contacts of the first relay 1322 and the second relay 1323 in the trip circuit 132 where the first control circuit 1321 is located to be opened, so that the SFC is triggered to trip and stop operation after the power loss trip relay 12 loses power. In the case of an abnormality occurring during the dragging and starting process of the pumped storage unit by the SFC, the first control circuit 1321 controls the normally closed contacts of the first relay 1322 and the second relay 1323 in the trip circuit 132 where the first control circuit 1321 is located to be opened, so that the trip circuit 132 is opened. When the tripping circuit 132 is disconnected, no current passes through the power-loss tripping relay 12, and the normally closed contact of the power-loss tripping relay 12 is closed after the power is lost, so that the joint tripping of the static frequency converter 11 is realized, and the safety of the pumped storage system 10 is ensured.
In an alternative implementation of the present application, as shown in fig. 4, each trip circuit 132 further includes a second control circuit 1324 and a third relay 1325, the second control circuit 1324 in the same trip circuit 132 is communicatively connected to the first control circuit 1321, and the third relay 1325 is connected in parallel to the second relay 1323 after being connected in series to the first relay 1322, wherein:
each first control circuit 1321 is configured to send a first control signal to a second control circuit 1324 communicatively connected to the first control circuit 1321 when an abnormality occurs in the process of dragging and starting the pumped storage unit in which the first control circuit 1321 is located by the SFC, where the first control signal is used to instruct the second control circuit 1324 to control a normally closed contact of a third relay 1325 in the trip circuit 132 in which the second control circuit 1324 is located to be opened, so that the SFC is triggered to trip and stop operation after the power loss trip relay loses power.
Specifically, in order to avoid the situation that the trip circuit 132 cannot be opened due to the abnormality of the first relay 1322, the second control circuit 1324 and the third relay 1325 may be connected to the trip circuit 132. The third relay 1325 is connected in series with the first relay 1322 and then connected in parallel with the second relay 1323.
Optionally, a certain contact in the third relay 1325 is connected in series with a certain contact in the first relay 1322, specifically which contact in the third relay 1325 is connected in series with which contact in the first relay 1322, which is not specifically limited in the embodiment of the present application.
Therefore, in the case that the first control circuit 1321 detects that an abnormality occurs during the dragging and starting process of the pumped storage group 13 in which the first control circuit 1321 is located by the SFC, the first control circuit 1321 may control the normally closed contacts of the first relay 1322 and the second relay 1323 in the trip circuit 132 in which the first control circuit 1321 is located to be opened. To avoid the situation that the trip circuit 132 cannot be opened due to the abnormality of the first relay 1322, the first control circuit 1321 may also send a first control signal to the second control circuit 1324 communicatively connected to the first control circuit 1321 to instruct the second control circuit 1324 to control the normally closed contact of the third relay 1325 in the trip circuit 132 where the second control circuit 1324 is located to be opened. Thus, a double guarantee of the trip circuit 132 can be made, which guarantees that the trip circuit 132 can be opened in case of an abnormality of the pumped-storage group 13 in which the first control circuit 1321 is located.
It should be noted that, the first control circuit 1321 may detect the working condition of the pumped storage unit in real time, and after detecting that an abnormal condition occurs in the process of dragging and starting the pumped storage unit in which the first control circuit 1321 is located by the SFC, control the normally closed contacts of the first relay 1322 and the second relay 1323 in the trip circuit 132 in which the first control circuit 1321 is located to be opened, and send the sequence of the first control signal to the second control circuit 1324 which is in communication connection with the first control circuit 1321 without specific limitation.
Optionally, after detecting that an abnormality occurs during the dragging and starting process of the pumped storage unit in which the first control circuit 1321 is located by the SFC, the first control circuit 1321 may first control the normally closed contacts of the first relay 1322 and the second relay 1323 in the trip circuit 132 in which the first control circuit 1321 is located to be opened, and then send a first control signal to the second control circuit 1324 which is in communication connection with the first control circuit 1321.
Optionally, after detecting that an abnormality occurs during the dragging and starting process of the pump storage unit in which the first control circuit 1321 is located by the SFC, the first control circuit 1321 may send a first control signal to the second control circuit 1324 communicatively connected to the first control circuit 1321, and then control the normally closed contacts of the first relay 1322 and the second relay 1323 in the trip circuit 132 in which the first control circuit 1321 is located to be opened, so that the SFC is triggered to trip and stop after the power failure of the power failure trip relay.
Optionally, after detecting that an abnormality occurs in the process of dragging the pumped storage unit where the first control circuit 1321 is located by the SFC, the first control circuit 1321 may send a first control signal to the second control circuit 1324 communicatively connected to the first control circuit 1321, and at the same time, control the normally closed contacts of the first relay 1322 and the second relay 1323 in the trip circuit 132 where the first control circuit 1321 is located to be opened, so that the SFC is triggered to trip and shut down after the power failure of the power failure trip relay.
And the second control circuit 1324 is used for controlling the normally closed contact of the third relay 1325 in the tripping circuit 132 where the second control circuit 1324 is located to be opened after receiving the first control signal, so that the SFC is triggered to trip and shut down after the power-loss tripping relay loses power.
Specifically, the second control circuit 1324 may disconnect by controlling the normally open contact of the third relay 1325 in the trip circuit 132 where the second control circuit 1324 is located after receiving the first control signal sent by the first control circuit 1321 which is in communication connection with the second control circuit 1324, so that the normally closed contact of the third relay 1325 in the trip circuit 132 where the second control circuit 1324 is located is opened, so that the SFC is triggered to trip and stop after the power loss trip relay loses power.
In this embodiment of the application, each first control circuit 1321 is configured to send a first control signal to a second control circuit 1324 communicatively connected to the first control circuit 1321 when an abnormality occurs in a process of dragging and starting the pumped storage unit where the first control circuit 1321 is located by the SFC, where the first control signal is used to instruct the second control circuit 1324 to control a normally closed contact of a third relay 1325 in the trip circuit 132 where the second control circuit 1324 is located to open. And a second control circuit 1324 for controlling the normally closed contact of the third relay 1325 in the trip circuit 132 where the second control circuit 1324 is located to be opened after receiving the first control signal. It is ensured that the trip circuit 132 can still be opened in case of an abnormality of the first relay 1322, thereby ensuring the safety of the pumped-hydro energy storage system.
In an alternative embodiment of the present application, as shown in fig. 5, each trip circuit 132 further includes a monitoring device 1326, the monitoring device 1326 is connected to the first control circuit 1321 and the second control circuit 1324, wherein:
each monitoring device 1326 is configured to send an abnormal signal to the first control circuit 1321 and the second control circuit 1324 connected to the monitoring device 1326 when detecting that an abnormality occurs in the process of dragging and starting the pumped storage group 13 where the monitoring device 1326 is located by the SFC, where the abnormal signal is used to represent that an abnormality occurs in the process of dragging and starting the pumped storage group 13 where the monitoring device 1326 is located by the SFC.
Specifically, the monitoring device 1326 may monitor signals such as current and voltage in the circuit, and when detecting that the signals such as current and voltage in the circuit are abnormal, the monitoring device 1326 determines that an abnormality occurs in the process of dragging and starting the pumped storage unit where the monitoring device 1326 is located by the SFC. The monitoring device 1326 transmits an abnormality signal to the first control circuit and the second control circuit connected to the monitoring device 1326.
Each of the first control circuits 1321 is configured to, after receiving an abnormality signal transmitted from the monitoring device 1326 connected to the first control circuit 1321, control the normally closed contacts of the first relay 1322 and the second relay 1323 in the trip circuit in which the first control circuit 1321 is located to be opened, and transmit a first control signal to the second control circuit 1324 communicatively connected to the first control circuit 1321.
Specifically, after receiving the abnormality signal transmitted from the monitoring device 1326 connected to the first control circuit 1321, the first control circuit 1321 may control the first relay 1322 and the second relay 1323 in the trip circuit 132 in which the first control circuit 1321 is located to normally close the contacts to open. To avoid the situation that the trip circuit 132 cannot be opened due to the abnormality of the first relay 1322, the first control circuit 1321 may also send a first control signal to the second control circuit 1324 communicatively connected to the first control circuit 1321 to instruct the second control circuit 1324 to control the normally closed contact of the third relay 1325 in the trip circuit 132 where the second control circuit 1324 is located to be opened. Thus, a double guarantee of the trip circuit 132 can be made, which guarantees that the trip circuit 132 can be opened in case of an abnormality of the pumped-storage group 13 in which the first control circuit 1321 is located.
And the second control circuit 1324 is used for controlling the normally closed contact of the third relay 1326 in the tripping circuit where the second control circuit 1324 is located to be opened after the abnormal signal is received, so that the SFC is triggered to trip and shut down after the power-loss tripping relay loses power.
Specifically, the second control circuit 1324 may disconnect by controlling the normally open contact of the third relay 1325 in the trip circuit 132 where the second control circuit 1324 is located after receiving the first control signal sent by the first control circuit 1321 which is in communication connection with the second control circuit 1324, so that the normally closed contact of the third relay 1325 in the trip circuit 132 where the second control circuit 1324 is located is opened, so that the SFC is triggered to trip and stop after the power loss trip relay loses power.
In the present embodiment, each trip circuit further includes a monitoring device 1326, the monitoring device 1326 is connected to the first control circuit 1321 and the second control circuit 1324, wherein: each monitoring device 1326 is configured to send an abnormal signal to the first control circuit 1321 and the second control circuit 1324 connected to the monitoring device 1326 when detecting that an abnormality occurs in the process of dragging and starting the pumped storage unit in which the monitoring device 1326 is located by the SFC, where the abnormal signal is used to represent that an abnormality occurs in the process of dragging and starting the pumped storage unit in which the monitoring device 1326 is located by the SFC; each first control circuit 1321 is configured to, after receiving an abnormal signal sent by the monitoring device 1326 connected to the first control circuit 1321, control the normally closed contacts of the first relay 1322 and the second relay 1323 in the trip circuit in which the first control circuit 1321 is located to be opened, and send a first control signal to the second control circuit 1324 communicatively connected to the first control circuit 1321; and the second control circuit 1324 is used for controlling the normally closed contact of the third relay 1325 in the trip circuit 132 where the second control circuit 1324 is located to be opened after receiving the abnormal signal, so that the SFC is triggered to trip and shut down after the power-loss trip relay 12 loses power. Therefore, when the first control circuit 1321 is abnormal and cannot send the first control signal to the second control circuit 1324, it is ensured that the second control circuit 1324 can receive the fault signal, so that the normally open contact of the third relay 1325 in the trip circuit 132 where the second control circuit 1324 is located is controlled to be disconnected, and the SFC is triggered to trip and stop after the power failure trip relay loses power.
In an alternative embodiment of the present application, each first control circuit 1321 is further configured to control the second relay 1323 in the trip circuit 132 where the first control circuit 1321 is located to close when the pumped-storage unit where the first control circuit 1321 is located is not in the process of being dragged by the SFC to start up, and the first relay 1322 in the trip circuit 132 where the first control circuit 1321 is located is abnormally closed.
In this case, one of the first relays 1322 is connected in parallel to one of the second relays 1323.
Specifically, because the first relay 1322 is connected in parallel with the second relay 1323, when the first control circuit 1321 detects that the pumped storage unit where the first control circuit 1321 is located is not in the process of being dragged and started by the SFC, and the first relay 1322 in the trip circuit 132 where the first control circuit 1321 is located is closed abnormally, in order to ensure that the pumped storage unit where the first control circuit 1321 is located can operate normally, the first control circuit 1321 may control the second relay 1323 in the trip circuit 132 where the first control circuit 1321 is located to be closed, so that the trip circuit 132 where the first control circuit 1321 is located is an open circuit, and thus it is ensured that the pumped storage unit 13 where the first control circuit 1321 is located can operate normally.
Optionally, each first control circuit 1321 is further configured to, when the pumped storage unit where the first control circuit 1321 is located is not in the process of being dragged and started by the SFC, and the third relay 1325 in the trip circuit 132 where the first control circuit 1321 is located is closed abnormally, control the second relay 1323 in the trip circuit 132 where the first control circuit 1321 is located to be closed.
Specifically, in the same trip circuit 132, the third relay 1325 is connected in parallel with the second relay 1323 after being connected in series with the first relay 1322. Therefore, when the first control circuit 1321 detects that the pumped storage unit where the first control circuit 1321 is located is not in the process of being dragged and started by the SFC, and the third relay 1325 in the trip circuit 132 where the first control circuit 1321 is located is abnormally closed, in order to ensure that the pumped storage unit where the first control circuit 1321 is located can normally operate, the first control circuit 1321 may control the second relay 1323 in the trip circuit 132 where the first control circuit 1321 is located to be closed, so that the trip circuit 132 where the first control circuit 1321 is located is a passage, and thus it is ensured that the pumped storage unit where the first control circuit 1321 is located can normally operate.
Optionally, each first control circuit 1321 is further configured to, when the pumped-storage unit where the first control circuit 1321 is located is not in the process of being dragged and started by the SFC, and the second relay 1323 in the trip circuit 132 where the first control circuit 1321 is located is abnormally closed, control the first relay 1322 and the third relay 1325 in the trip circuit 132 where the first control circuit 1321 is located to be closed.
Specifically, in the same trip circuit 132, the third relay 1325 is connected in parallel with the second relay 1323 after being connected in series with the first relay 1322. Under the condition that the first control circuit 1321 detects that the pumped storage unit where the first control circuit 1321 is located is not in the process of being dragged and started by the SFC, and the second relay 1323 in the trip circuit 132 where the first control circuit 1321 is located is abnormally closed, in order to ensure that the pumped storage unit where the first control circuit 1321 is located can normally operate, the first control circuit 1321 may control the first relay 1322 and the third relay 1325 in the trip circuit 132 where the first control circuit 1321 is located to be closed, so that the trip circuit 132 where the first control circuit 1321 is located is a through circuit, and thus it is ensured that the pumped storage unit where the first control circuit 1321 is located can normally operate.
In the embodiment of the present application, each first control circuit 1321 is further configured to control the second relay 1323 in the trip circuit 132 where the first control circuit 1321 is located to close when the pumped storage unit where the first control circuit 1321 is located is not in the process of being dragged and started by the SFC and the first relay 1322 in the trip circuit 132 where the first control circuit 1321 is located is abnormally closed. Each first control circuit 1321 is further configured to, in a case where the pumped-storage unit where the first control circuit 1321 is located is not in a process of being dragged and started by the SFC, and the third relay 1325 in the trip circuit 132 where the first control circuit 1321 is located is abnormally closed, control the second relay 1323 in the trip circuit 132 where the first control circuit 1321 is located to be closed. In the above embodiment, each trip circuit 132 includes two parallel paths, and when the pumped storage unit to which the trip circuit 132 belongs is not in the process of being dragged and started by the SFC and one of the paths in the trip circuit 132 is abnormal, the other path may be controlled to be closed by the first control circuit 1321 or/and the second control circuit 1324, so that the pumped storage unit to which the trip circuit 132 belongs is ensured to normally operate, and the operating efficiency is improved.
In an alternative implementation of the present application, as shown in fig. 6, the pumped-hydro energy storage system 10 further includes a third control circuit 14 and a fourth relay 15, the fourth relay 15 is connected in series with the trip circuit 132 of each pumped-hydro energy storage group, and the third control circuit 14 is communicatively connected to each first control circuit 1321, where:
each first control circuit 1321 is configured to send a second control signal to the third control circuit 14 when the pumped storage unit where the first control circuit 1321 is located is abnormal in the process of being dragged and started by the SFC, where the second control signal is used to instruct the third control circuit 14 to control the normally closed contact of the fourth relay 15 to be opened, so that the SFC is triggered to trip and stop operation after the power failure trip relay loses power. .
In order to prevent the tripping circuit 132 from being abnormal, which would result in the failure of the power-loss tripping relay 12 to trip, a third control circuit 14 and a fourth relay 15 may be installed in the pumped-storage system 10, wherein the fourth relay 15 is connected in series with each pumped-storage group, and the third control circuit 14 is connected in communication with each first control circuit 1321.
Specifically, the first control circuit 1321 may detect the working condition of the pumped storage unit in real time, and when detecting that an abnormality occurs during the process of dragging and starting the pumped storage unit in which the first control circuit 1321 is located by the SFC, may control the normally closed contacts of the first relay 1322 and the second relay 1323 in the trip circuit 132 in which the first control circuit 1321 is located to be opened, and send a first control signal to the second control circuit 1324 communicatively connected to the first control circuit 1321, so as to instruct the second control circuit 1324 communicatively connected to the first control circuit 1321 to control the third relay 1325 to trip. To prevent the trip circuit 132 from being abnormal, which would cause the power-loss trip relay 12 to fail to trip, the first control circuit 1321 may also send a second control signal to the third control circuit 14 instructing the third control circuit 14 to control the fourth relay 15 to open its normally closed contacts.
It should be noted that, the sequence of the first control circuit 1321, which can detect the working condition of the pumped storage unit in real time, and after detecting that the pumped storage unit in which the first control circuit 1321 is located is abnormal, control the normally closed contacts of the first relay 1322 and the second relay 1323 in the trip circuit 132 in which the first control circuit 1321 is located to open, send the first control signal to the second control circuit 1324 in communication connection with the first control circuit 1321, and send the second control signal to the third control circuit 14 is not specifically limited.
And the third control circuit 14 is used for controlling the normally closed contact of the fourth relay 15 to be opened after receiving the second control signal, so that the SFC is triggered to trip and stop after the power-off tripping relay is powered off.
Specifically, the third control circuit 14 may control the open contact of the fourth relay 15 to be disconnected after receiving the second control signal, thereby controlling the normally closed contact of the fourth relay 15 to be disconnected.
In the applied embodiment, each first control circuit 1321 is configured to send a second control signal to the third control circuit 14 when an abnormality occurs in the dragging and starting process of the pumped storage unit in which the first control circuit 1321 is located by the SFC. And the third control circuit 14 is used for controlling the normally closed contact of the fourth relay 15 to be opened after receiving the second control signal. Therefore, the condition that the tripping circuit 132 is abnormal to cause the tripping failure of the power-off tripping relay 12 is avoided, so that the power-off tripping relay 12 can still trip under the condition that the tripping circuit 132 is abnormal, and the safety of the pumped storage system 10 is ensured.
In an alternative implementation of the present application, when one or more connection points in each trip circuit 132 become loose during the process of the pumped storage group not being dragged by the SFC to start, the trip circuit is powered off, so that the power-off trip relay is powered off to trigger the SFC to trip and shut down. Therefore, when the pumped storage unit is not in the process of being dragged and started by the SFC, monitoring and alarming of each trip circuit are realized, the condition that the connection of the trip circuits is interrupted can be ensured to be found in time, and the risk that the accident is enlarged due to the fact that the linked tripping SFC cannot be caused by failure of the trip circuits is greatly reduced.
Referring to fig. 7, an embodiment of the present application provides a method for controlling the pumped-hydro energy storage system 10, where the method is executed by the pumped-hydro energy storage system 10 provided in the foregoing embodiment, and includes the following specific steps:
in step 701, the static frequency converter 11 supplies current to the working circuits 131 in each pumped storage group.
Specifically, when the pumped storage unit normally works, the static frequency converter 11 may provide a current with a gradually increasing frequency to the stator in the pumped storage unit to drag the rotor in the pumped storage unit to increase the speed, so that the pumped storage unit normally works.
In step 702, when an abnormality occurs in the process that the pumped storage unit where the first control circuit 1321 is located is dragged by the SFC to start, the first control circuit 1321 controls the normally closed contacts of the first relay 1322 and the second relay 1323 in the trip circuit 132 where the first control circuit 1321 is located to be opened, so that the SFC is triggered to trip and stop operation after the power failure trip relay loses power.
Specifically, the first control circuit 1321 may detect the working condition of the pumped storage unit in real time, and when detecting that an abnormality occurs in the process of dragging and starting the pumped storage unit in which the first control circuit 1321 is located by the SFC, the first control circuit 1321 may control the normally closed contacts of the first relay 1322 and the second relay 1323 in the trip circuit 132 in which the first control circuit 1321 is located to be opened, so as to open the trip circuit 132. When the trip circuit 132 is disconnected, no current passes through the power-off trip relay 12, and the normally closed contact is disconnected after the power-off trip relay 12 is powered off, so that the joint tripping of the static frequency converter 11 is realized, and the safety of the equipment is ensured.
In the embodiment of the present application, the static frequency converter 11 supplies current to the working circuit 131 in each pumped-storage group. When the pumped storage unit where the first control circuit 1321 is located is dragged by the SFC to start up, and an abnormality occurs, the first control circuit 1321 controls the normally closed contacts of the first relay 1322 and the second relay 1323 in the trip circuit 132 where the first control circuit 1321 is located to be opened. In the above method, the first control circuit 1321 opens the trip circuit 132 by controlling the normally closed contacts of the first relay 1322 and the second relay 1323 in the trip circuit 132 where the first control circuit 1321 is located to open. When the trip circuit 132 is disconnected, no current passes through the power-off trip relay 12, and the normally closed contact is disconnected after the power-off trip relay 12 is powered off, so that the joint tripping of the static frequency converter 11 is realized, and the safety of the equipment is ensured.
In an embodiment of the present application, each trip circuit 132 further includes a second control circuit 1324 and a third relay 1325, the second control circuit 1324 in the same trip circuit 132 is communicatively connected to the first control circuit 1321, and after the third relay 1325 is connected in series to the first relay 1322, the second relay 1323 is connected in parallel, as shown in fig. 8, the method for controlling the pumped-hydro energy storage system 10 may further include the following steps:
in step 801, when an abnormality occurs in the process of dragging and starting the pumped storage unit in which the first control circuit 1321 is located by the SFC, the first control circuit 1321 sends a first control signal to a second control circuit 1324 which is in communication connection with the first control circuit 1321.
The first control signal is used to instruct the second control circuit 1324 to control the normally closed contact of the third relay 1325 in the trip circuit 132 where the second control circuit 1324 is located to be opened.
Specifically, when the first control circuit 1321 detects that an abnormality occurs in the process of dragging the pumped storage unit in which the first control circuit 1321 is located by the SFC to start, the first control circuit 1321 may control the normally closed contacts of the first relay 1322 and the second relay 1323 in the trip circuit 132 in which the first control circuit 1321 is located to open. To avoid the situation that the trip circuit 132 cannot be opened due to the abnormality of the first relay 1322, the first control circuit 1321 may also send a first control signal to the second control circuit 1324 communicatively connected to the first control circuit 1321 to instruct the second control circuit 1324 to control the normally closed contact of the third relay 1325 in the trip circuit 132 where the second control circuit 1324 is located to be opened. Therefore, the trip circuit 132 can be doubly guaranteed, and the trip circuit 132 can be disconnected under the condition that an abnormality occurs in the dragging and starting process of the pumped storage unit where the first control circuit 1321 is located by the SFC.
In step 802, after receiving the first control signal, the second control circuit 1324 controls the normally closed contact of the third relay 1325 in the trip circuit 132 where the second control circuit 1324 is located to open, so that the SFC is triggered to trip and shut down after the power loss trip relay loses power.
Specifically, the second control circuit 1324 may disconnect by controlling the normally open contact of the third relay 1325 in the trip circuit 132 where the second control circuit 1324 is located after receiving the first control signal transmitted by the first control circuit 1321 communicatively connected with the second control circuit 1324, so that the normally closed contact of the third relay 1325 in the trip circuit 132 where the second control circuit 1324 is located is opened.
In this embodiment, when an abnormality occurs during the dragging and starting process of the pumped storage unit in which the first control circuit 1321 is located by the SFC, the first control circuit 1321 sends a first control signal to the second control circuit 1324 communicatively connected to the first control circuit 1321, where the first control signal is used to instruct the second control circuit 1324 to control the normally closed contact of the third relay 1325 in the trip circuit 132 in which the second control circuit 1324 is located to open. Upon receiving the first control signal, the second control circuit 1324 controls the third relay 1325 in the trip circuit 132 where the second control circuit 1324 is located to open the normally closed contact. It is thus ensured that in the event of an abnormality in the first relay 1322, the trip circuit 132 can still be opened, thereby ensuring the safety of the apparatus.
In an embodiment of the present application, the pumped-hydro energy storage system 10 further includes a third control circuit 14 and a fourth relay 15, the fourth relay 15 is connected in series with each pumped-hydro energy storage unit, and the third control circuit 14 is connected in communication with each first control circuit 1321, as shown in fig. 9, the method for controlling the pumped-hydro energy storage system 10 may further include the following steps:
in step 901, when an abnormality occurs in the process of dragging and starting the pumped storage unit where the first control circuit 1321 is located by the SFC, each first control circuit 1321 sends a second control signal to the third control circuit 14.
Wherein the second control signal is used for instructing the third control circuit 14 to control the normally closed contact of the fourth relay 15 to be opened.
Specifically, the first control circuit 1321 may detect the working condition of the pumped storage unit in real time, and when detecting that an abnormality occurs during the process of dragging and starting the pumped storage unit in which the first control circuit 1321 is located by the SFC, may control the normally closed contacts of the first relay 1322 and the second relay 1323 in the trip circuit 132 in which the first control circuit 1321 is located to be opened, and send a first control signal to the second control circuit 1324 communicatively connected to the first control circuit 1321, so as to instruct the second control circuit 1324 communicatively connected to the first control circuit 1321 to control the third relay 1325 to trip. To prevent the trip circuit 132 from being abnormal, which would cause the power-loss trip relay 12 to fail to trip, the first control circuit 1321 may also send a second control signal to the third control circuit 14 instructing the third control circuit 14 to control the fourth relay 15 to open its normally closed contacts.
It should be noted that, the sequence of the first control circuit 1321, which can detect the working condition of the pumped storage unit in real time, and after detecting that the pumped storage unit in which the first control circuit 1321 is located is abnormal, control the normally closed contacts of the first relay 1322 and the second relay 1323 in the trip circuit 132 in which the first control circuit 1321 is located to open, send the first control signal to the second control circuit 1324 in communication connection with the first control circuit 1321, and send the second control signal to the third control circuit 14 is not specifically limited.
And 902, after receiving the second control signal, controlling the normally closed contact of the fourth relay 15 to be opened by the third control circuit 14, so that the SFC is triggered to trip and shut down after the power-off tripping relay is powered off.
Specifically, the third control circuit 14 may control the open contact of the fourth relay 15 to be disconnected after receiving the second control signal, thereby controlling the normally closed contact of the fourth relay 15 to be disconnected.
In an embodiment of the present application, when an abnormality occurs during the dragging and starting process of the pumped storage unit in which the first control circuit 1321 is located by the SFC, each first control circuit 1321 sends a second control signal to the third control circuit 14, where the second control signal is used to instruct the third control circuit 14 to control the normally closed contact of the fourth relay 15 to open. After receiving the second control signal, the third control circuit 14 controls the normally closed contact of the fourth relay 15 to be opened. Therefore, the condition that the tripping circuit 132 is abnormal to cause the tripping failure of the power-off tripping relay 12 is avoided, so that the power-off tripping relay 12 can still trip under the condition that the tripping circuit 132 is abnormal, and the safety of the pumped storage system 10 is ensured.
It should be understood that although the various steps in the flowcharts of fig. 7-9 are shown in order as indicated by the arrows, the steps are not necessarily performed in order as indicated by the arrows. The steps are not performed in the exact order shown and described, and may be performed in other orders, unless explicitly stated otherwise. Moreover, at least some of the steps in fig. 7-9 may include multiple steps or multiple stages, which are not necessarily performed at the same time, but may be performed at different times, which are not necessarily performed in sequence, but may be performed in turn or alternately with other steps or at least some of the other steps.
In one embodiment of the present application, a computer readable storage medium is provided, which is applied to a pumped-storage system 10, the pumped-storage system 10 includes a static frequency converter 11, a power-loss tripping relay 12, and a plurality of pumped-storage groups, which are sequentially connected in series, each pumped-storage group includes a working circuit 131 and a tripping circuit 132, which are connected in series, each tripping circuit 132 includes a first control circuit 1321, a first relay 1322, and a second relay 1323, wherein the first relay 1322 and the second relay 1323 are connected in series, and a computer program is stored thereon, and when being executed by a processor, the computer program implements the following steps: the static frequency converter 11 provides current for the working circuit 131 in each pumped storage unit; when the pumped storage unit where the first control circuit 1321 is located is dragged by the SFC to start, the first control circuit 1321 controls the normally closed contacts of the first relay 1322 and the second relay 1323 in the trip circuit 132 where the first control circuit 1321 is located to be opened, so that the SFC is triggered to trip and stop after the power failure of the power failure trip relay.
In one embodiment of the present application, each trip circuit 132 further comprises a second control circuit 1324 and a third relay 1325, the second control circuit 1324 in the same trip circuit 132 is communicatively connected to the first control circuit 1321, and the third relay 1325 is connected in series with the first relay 1322 and then in parallel with the second relay 1323, and the computer program when executed by the processor further implements the steps of: under the condition that the pumped storage unit where the first control circuit 1321 is located is dragged by the SFC to be started, the first control circuit 1321 sends a first control signal to a second control circuit 1324 which is in communication connection with the first control circuit 1321, and the first control signal is used for instructing the second control circuit 1324 to control a normally closed contact of a third relay 1325 in a trip circuit 132 where the second control circuit 1324 is located to be opened; after receiving the first control signal, the second control circuit 1324 controls the normally closed contact of the third relay 1325 in the trip circuit 132 where the second control circuit 1324 is located to be opened, so that the SFC is triggered to trip and shut down after the power-loss trip relay loses power.
In one embodiment of the present application, the pumped-storage system 10 further includes a third control circuit 14 and a fourth relay 15, the fourth relay 15 is connected in series with each pumped-storage unit, the third control circuit 14 is connected in communication with each first control circuit 1321, and when executed by the processor, the computer program further implements the following steps: under the condition that the pumped storage unit where the first control circuit 1321 is located is abnormal in the dragging and starting process of the SFC, each first control circuit 1321 sends a second control signal to the third control circuit 14; after receiving the second control signal, the third control circuit 14 controls the normally closed contact of the fourth relay 15 to be opened, so that the SFC is triggered to trip and stop after the power-off tripping relay is powered off.
It will be understood by those skilled in the art that all or part of the processes of the methods of the embodiments described above can be implemented by hardware instructions of a computer program, which can be stored in a non-volatile computer-readable storage medium, and when executed, can include the processes of the embodiments of the methods described above. Any reference to memory, storage, database or other medium used in the embodiments provided herein can include at least one of non-volatile and volatile memory. Non-volatile Memory may include Read-Only Memory (ROM), magnetic tape, floppy disk, flash Memory, optical storage, or the like. Volatile Memory can include Random Access Memory (RAM) or external cache Memory. By way of illustration and not limitation, RAM can take many forms, such as Static Random Access Memory (SRAM) or Dynamic Random Access Memory (DRAM), among others.
The technical features of the above embodiments can be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the above embodiments are not described, but should be considered as the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above-mentioned embodiments only express several embodiments of the present application, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the concept of the present application, which falls within the scope of protection of the present application. Therefore, the protection scope of the present patent shall be subject to the appended claims.

Claims (10)

1. A pumped storage system is characterized by comprising a static frequency converter, a power-off tripping relay and a plurality of pumped storage units which are sequentially connected in series, wherein each pumped storage unit comprises a working circuit and a tripping circuit, each tripping circuit comprises a first control circuit, a first relay and a second relay, and the first relay and the second relay are connected in parallel;
the static frequency converter is used for providing current for stators in working circuits in the pumped storage units;
each first control circuit is used for controlling the normally closed contacts of the first relay and the second relay in the tripping circuit where the first control circuit is located to be disconnected under the condition that the pumped storage unit where the first control circuit is located is abnormal in the dragging and starting process of the SFC, so that the SFC is triggered to trip and stop operation after the power failure tripping relay loses power.
2. The system of claim 1, wherein each of the trip circuits further comprises a second control circuit and a third relay, the second control circuit in the same trip circuit communicatively coupled to the first control circuit, and the third relay connected in series with the first relay and then in parallel with the second relay, wherein:
each first control circuit is used for sending a first control signal to the second control circuit in communication connection with the first control circuit when the pumped storage unit where the first control circuit is located is abnormal in the dragging and starting process of the pumped storage unit by the SFC, and the first control signal is used for indicating the second control circuit to control the normally closed contact of the third relay in the tripping circuit where the second control circuit is located to be disconnected;
and the second control circuit is used for controlling the normally closed contact of the third relay in the tripping circuit where the second control circuit is located to be opened after receiving the first control signal, so that the SFC is triggered to trip and shut down after the power-loss tripping relay loses power.
3. The system of claim 2, wherein each of the trip circuits further comprises a monitoring device coupled to the first control circuit and the second control circuit, wherein:
each monitoring device is used for sending an abnormal signal to the first control circuit and the second control circuit which are connected with the monitoring device when detecting that the pumped storage unit where the monitoring device is located is abnormal in the dragging and starting process of the pumped storage unit by the SFC, wherein the abnormal signal is used for representing that the pumped storage unit where the monitoring device is located is abnormal in the dragging and starting process of the pumped storage unit by the SFC;
each first control circuit is configured to, after receiving the abnormal signal sent by the monitoring device connected to the first control circuit, control the normally closed contacts of the first relay and the second relay in the trip circuit where the first control circuit is located to be opened, and send the first control signal to the second control circuit communicatively connected to the first control circuit;
and the second control circuit is used for controlling the normally closed contact of the third relay in the tripping circuit where the second control circuit is located to be opened after receiving the abnormal signal, so that the SFC is triggered to trip and shut down after the power-off tripping relay is powered off.
4. The system of claim 1, wherein the pumped-hydro energy storage system further comprises a third control circuit and a fourth relay, the fourth relay connected in series with the trip circuit in each of the pumped-hydro energy storage groups, the third control circuit communicatively connected to each of the first control circuits, wherein:
each first control circuit is used for sending a second control signal to the third control circuit when the pumped storage unit where the first control circuit is located is abnormal in the dragging and starting process of the pumped storage unit by the SFC, and the second control signal is used for indicating the third control circuit to control the normally closed contact of the fourth relay to be opened;
and the third control circuit is used for controlling the normally closed contact of the fourth relay to be opened after receiving the second control signal, so that the SFC is triggered to trip and stop after the power-off tripping relay is powered off.
5. The system of claim 1, wherein each of the first control circuits is further configured to control the second relay in the trip circuit in which the first control circuit is located to close if the pumped-storage unit in which the first control circuit is located is not in the process of being dragged by the SFC during startup and if the first relay in the trip circuit in which the first control circuit is located is abnormally closed.
6. The system of claim 2, wherein each of the first control circuits is further configured to control the second relay in the trip circuit in which the first control circuit is located to close if the pumped-storage unit in which the first control circuit is located is not in the process of being dragged by the SFC during startup and if the third relay in the trip circuit in which the first control circuit is located is abnormally closed.
7. A pumped storage system control method is applied to a pumped storage system, the pumped storage system comprises a static frequency converter, a power-off tripping relay and a plurality of pumped storage units which are sequentially connected in series, each pumped storage unit comprises a working circuit and a tripping circuit, each tripping circuit comprises a first control circuit, a first relay and a second relay, wherein the first relay and the second relay are connected in parallel, and the method comprises the following steps:
the static frequency converter provides current for working circuits in the pumped storage units;
under the condition that the pumped storage unit where the first control circuit is located is abnormal in the dragging and starting process of the SFC, the first control circuit controls the normally closed contacts of the first relay and the second relay in the tripping circuit where the first control circuit is located to be disconnected, so that the SFC is triggered to trip and stop operation after the power failure tripping relay loses power.
8. The method of claim 7, wherein each of the trip circuits further comprises a second control circuit and a third relay, the second control circuit in the same trip circuit communicatively coupled to the first control circuit, and the third relay connected in series with the first relay and then in parallel with the second relay, the method further comprising:
when the pumped storage unit where the first control circuit is located is abnormal in the dragging and starting process of the SFC, the first control circuit sends a first control signal to the second control circuit which is in communication connection with the first control circuit, wherein the first control signal is used for indicating the second control circuit to control the normally closed contact of the third relay in the tripping circuit where the second control circuit is located to be disconnected;
after receiving the first control signal, the second control circuit controls the normally closed contact of the third relay in the tripping circuit where the second control circuit is located to be opened, so that the SFC is triggered to trip and shut down after the power-loss tripping relay loses power.
9. The method of claim 7, wherein the pumped-hydro energy storage system further comprises a third control circuit and a fourth relay, the fourth relay being connected in series with the trip circuit in each of the pumped-hydro energy storage groups, the third control circuit being communicatively connected to each of the first control circuits, the method further comprising:
under the condition that the pumped storage unit where the first control circuit is located is abnormal in the dragging and starting process of the SFC, each first control circuit sends a second control signal to the third control circuit, and the second control signal is used for indicating the third control circuit to control the normally closed contact of the fourth relay to be opened;
and after receiving the second control signal, the third control circuit controls the normally closed contact of the fourth relay to be opened so that the power-off tripping relay is powered off and an SFC is triggered to trip and shut down.
10. A computer-readable storage medium, on which a computer program is stored, which, when being executed by a processor, carries out the steps of the method of any one of claims 7 to 9.
CN202110668373.6A 2021-06-16 2021-06-16 Pumped-storage system, control method and storage medium Active CN113395017B (en)

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