CN202121383U

CN202121383U - Automatic voltage control system of regional electrical network

Info

Publication number: CN202121383U
Application number: CN 201120233154
Authority: CN
Inventors: 李闯; 刘相枪; 曹玉文; 吴有能; 邓厚兵; 黄集贤; 霍正宇; 钟晖; 卢英俊; 段春
Original assignee: Nanning Bureau of Extra High Voltage Power Transmission Co
Current assignee: Nanning Bureau of Extra High Voltage Power Transmission Co
Priority date: 2011-07-01
Filing date: 2011-07-01
Publication date: 2012-01-18
Anticipated expiration: 2021-07-01

Abstract

The utility model provides an automatic voltage control system of a regional electrical network. The automatic voltage control system includes at least two tele-control devices, a supervisory control and data acquisition (SCADA) server and an automatic voltage control (AVC) device. The tele-control device arranged on a transformer end acquires the state data of the transformer, and transmits the acquired state data to the SCADA server via a network; and then a remote control order from the SCADA server is transmitted to a device used to control and operate the transformer; the SCADA server acquires the state data of the transformers via the network, and transmits the state data to the AVC device; after receiving a control order from the AVC device, the remote control order is transmitted to the tele-control device arranged on the transformer end pointed by the control order via the network; the AVC device monitors the state data of the transformers, and generates the control order to an abnormal transformer based on a preset control strategy, and transmits the control order to the SCADA server.

Description

Automatic voltage control system of regional power grid

[ technical field ] A method for producing a semiconductor device

The utility model relates to an electric power system control technique, in particular to automatic voltage control system of regional electric wire netting.

[ background of the invention ]

In recent years, with the rapid development of a dispatching automation system and the gradual improvement of the reliability of a substation infrastructure, higher requirements are put forward on the voltage control of a regional power grid, particularly on the aspects of maintaining the safety and stability of the power grid, ensuring the voltage quality and reducing the loss of the power grid. At present, most of voltage control of regional power grids depends on manual adjustment of operators of a control center according to collected power grid state parameters, and therefore the voltage control system is high in workload, low in efficiency and incapable of guaranteeing safety and timeliness.

[ Utility model ] content

In view of this, the utility model provides an automatic voltage control system of regional electric wire netting to in the automatic voltage control who realizes regional electric wire netting, improve control efficiency, and can ensure security and promptness.

The specific technical scheme is as follows:

an automatic voltage control system of a regional power grid comprises more than one telecontrol device, a data acquisition and monitoring SCADA server and an automatic voltage control AVC device;

the telemechanical device is arranged at a transformer substation end and used for acquiring state data of the transformer substation and sending the acquired state data to the SCADA server through a network; after receiving a remote control instruction sent by the SCADA server, sending the remote control instruction to a device for controlling and operating a transformer substation;

the SCADA server is used for acquiring the state data of each transformer substation through a network and sending the acquired state data of each transformer substation to the AVC device; after receiving a control instruction of the AVC device, sending a remote control instruction to a telecontrol device arranged at a transformer substation end to which the control instruction is directed through the network;

and the AVC device is used for monitoring the state data of each transformer substation, generating a control instruction aiming at the transformer substation with abnormal state according to a preset control strategy and sending the control instruction to the SCADA server.

The SCADA server is further used for determining whether each transformer substation is abnormal in state or not and sending the abnormal state to the AVC device; or,

the AVC device is also used for determining whether each transformer substation has abnormal state;

specifically, the determining whether the state abnormality occurs in each substation is as follows:

if the condition data of the transformer substation is determined that the 500kV bus voltage is higher than a preset first voltage upper limit and the 220kV bus voltage is higher than a preset second voltage upper limit, determining that the transformer substation is abnormal in condition; or,

if the fact that the 500kV bus voltage is lower than a preset first voltage lower limit and the 220kV bus voltage is lower than a preset second voltage lower limit in the state data of the transformer substation is determined, it is determined that the transformer substation is abnormal in state; or,

if the voltage of the 500kV bus in the state data of the transformer substation is determined to be qualified and the voltage of the 220kV bus is higher than the preset second voltage upper limit, determining that the transformer substation is abnormal in state; or,

if the voltage of the 500kV bus in the state data of the transformer substation is determined to be qualified and the voltage of the 220kV bus is lower than a preset second voltage lower limit, determining that the transformer substation is abnormal in state; or,

if the fact that the 500kV bus voltage is higher than a preset first voltage upper limit and the 220kV bus voltage is lower than a preset second voltage lower limit in the state data of the transformer substation is determined, it is determined that the transformer substation is abnormal in state; or,

if the fact that the voltage of the 500kV bus in the state data of the transformer substation is lower than a preset first voltage lower limit and the voltage of the 220kV bus in the state data of the transformer substation is higher than a preset second voltage upper limit is determined, it is determined that the transformer substation is abnormal in state; or,

if the condition data of the transformer substation is determined that the 500kV bus voltage is higher than the preset first voltage upper limit and the 220kV bus voltage is qualified, determining that the transformer substation is abnormal in condition; or,

if the 500kV bus voltage in the state data of the transformer substation is lower than a preset first voltage lower limit and the 220kV bus voltage is qualified, determining that the transformer substation is abnormal in state; or,

if the fact that the voltage of a bus in the state data of the transformer substation does not change is determined, the fact that the state of the transformer substation is abnormal is determined; or,

if the condition data of the transformer substation indicate that the capacitor or the reactor trips, determining that the transformer substation is abnormal in condition;

wherein the first upper voltage limit is greater than the first lower voltage limit, the second upper voltage limit is greater than the second lower voltage limit, the first upper voltage limit is greater than the second upper voltage limit, and the first lower voltage limit is greater than the second lower voltage limit.

Aiming at the abnormal state, if the condition data of the transformer substation is determined that the 500kV bus voltage is higher than a preset first voltage upper limit and the 220kV bus voltage is higher than a preset second voltage upper limit, the AVC device generates a control instruction for switching a capacitor and putting a reactor into the transformer substation; or,

if the situation that the 500kV bus voltage is lower than a preset first voltage lower limit and the 220kV bus voltage is lower than a preset second voltage lower limit in the state data of the transformer substation is determined, the AVC device generates a control instruction for a switched reactor capacitor of the transformer substation; or,

if the voltage of the 500kV bus in the state data of the transformer substation is determined to be qualified and the voltage of the 220kV bus is higher than a preset second voltage upper limit, a control instruction generated by the AVC device is to cut a capacitor and put a reactor on the basis of ensuring the voltage of the 500kV bus to be qualified for the transformer substation; or,

if the voltage of the 500kV bus in the state data of the transformer substation is determined to be qualified and the voltage of the 220kV bus is lower than a preset second lower voltage limit, a control instruction generated by the AVC device is to switch on a reactor to switch on a capacitor on the basis of ensuring the voltage of the 500kV bus to be qualified; or,

if the condition data of the transformer substation are determined that the 500kV bus voltage is higher than a preset first upper voltage limit and the 220kV bus voltage is lower than a preset second lower voltage limit, the AVC device generates a control instruction for switching a capacitor and putting a reactor into the transformer substation; or,

if the 500kV bus voltage is lower than a preset first voltage lower limit and the 220kV bus voltage is higher than a preset second voltage upper limit in the state data of the transformer substation, the AVC device generates a control instruction for switching a reactor of the transformer substation to throw a capacitor; or,

if the condition data of the transformer substation is determined that the 500kV bus voltage is higher than a preset first voltage upper limit and the 220kV bus voltage is qualified, the AVC device generates a control instruction for switching a capacitor and putting a reactor into the transformer substation; or,

if the 500kV bus voltage in the state data of the transformer substation is lower than a preset first voltage lower limit and the 220kV bus voltage is qualified, the AVC device generates a control instruction for switching a reactor of the transformer substation to a capacitor; or,

if the fact that the voltage of a bus in the state data of the transformer substation does not change is determined, the control instruction generated by the AVC device is the bus with the unchanged locking voltage of the transformer substation; or,

if the state data of the substation indicates that the capacitor or the reactor trips, the AVC device generates a control instruction to lock the tripped capacitor or reactor for the substation.

Preferably, if the AVC apparatus determines whether or not a state abnormality occurs in each substation, the system further includes: and the AVC client is used for sending the first upper voltage limit, the first lower voltage limit, the second upper voltage limit and the second lower voltage limit which are set by a user to the AVC device.

Furthermore, the SCADA server is also used for giving an alarm for the transformer substation with abnormal state or giving an alarm for the transformer substation for which the remote control instruction is not replied;

and after the device for controlling and operating the transformer substation executes the control operation, replying to the SCADA server through the telecontrol device.

Or the AVC device is also used for giving an alarm for the transformer substation with abnormal state or giving an alarm for the transformer substation for which the remote control instruction is not replied;

and the device for controlling the transformer substation replies to the AVC device through the telecontrol device and the SCADA server after executing the control operation.

Preferably, the telecontrol apparatus, the SCADA server, or the AVC apparatus adopt a primary-standby dual device configuration, so as to switch to a standby device in time when the primary device fails.

Specifically, the device for controlling and operating the substation is as follows: the field measurement and control device is arranged at each monitoring point in the transformer substation;

the field measurement and control device is also used for collecting state data of the monitoring point and sending the state data to the telecontrol device;

and the telecontrol device summarizes the state data of each monitoring point in the transformer substation.

Still further, the system further comprises:

a first protocol converter provided between the remote control apparatus and the network, for converting the status data transmitted from the remote control apparatus into a protocol supported by the network, and converting the remote control instruction from the network into a protocol supported by the remote control apparatus;

and the second protocol converter is arranged between the SCADA server and the network and used for converting the state data from the network into a protocol supported by the SCADA server and converting the remote control command sent by the SCADA server into the protocol supported by the network.

According to the technical scheme provided by the utility model, the system can realize the automatic voltage control of regional electric wire netting, need not the operation personnel and carries out manual regulation according to the electric wire netting state parameter who gathers, has saved work load, has improved control efficiency, can ensure security and promptness.

[ description of the drawings ]

Fig. 1 is a schematic diagram of a system structure provided by the present invention;

fig. 2 is an example diagram of the system provided by the present invention being laid in a network.

[ detailed description ] embodiments

In order to make the objects, technical solutions and advantages of the present invention clearer, the present invention will be described in detail with reference to the accompanying drawings and specific embodiments.

Fig. 1 is a schematic structural diagram of the system provided by the present invention, as shown in fig. 1, the system may include: more than one telemechanical device 101 (one is exemplified in fig. 1), a data acquisition and monitoring (SCADA) server 102, and an Automatic Voltage Control (AVC) device 103.

The telemechanical device 101 is respectively disposed at each substation end, and collects status data of a substation where the telemechanical device is located, where the status data may include but is not limited to: bus voltage, capacitor state, or reactor state; the collected status data is then sent to SCADA server 102 over a network.

The status data may pass through a first protocol converter 104 and a second protocol converter 105 provided at both ends of the network in order in the process of reaching the SCADA server 102 via the network.

The first protocol converter 104 is provided between the remote control device 101 and the network, and is configured to convert the status data transmitted by the remote control device 101 into a protocol supported by the network.

A second protocol converter 105 is arranged between the SCADA server 102 and the network for converting status data from the network into a protocol supported by the SCADA server 102.

The

protocol converters

104 and 105 perform protocol conversion according to specific network types, for example, if an optical network is used, that is, if a fiber channel is used for data or instruction transmission, conversion into a data transmission protocol supported by the optical network is required.

There may be other network communication devices such as routers, front-end communication servers, etc. to exchange network data, and they are not described in detail herein.

The SCADA server 102 collects status data of each substation through a network, and transmits the collected status data of each substation to the AVC apparatus 103.

The SCADA server 102 performs unified data collection on the telecontrol devices 101 installed at each substation, performs data processing on the collected data, and sends the processed data to the AVC apparatus 103, where the data processing may include, but is not limited to: performing range conversion on the state data to convert the state data into a uniform range so as to facilitate monitoring of the AVC device 103; or filtering the state data to filter out interference data or bad data; or, the state data is stored, namely the collected state data is stored, so that the historical records of the state data of each transformer substation can be searched at any time, and the subsequent calling at any time is facilitated.

The AVC apparatus 103 monitors the status data of each substation, generates a control command for the substation in which the status abnormality occurs according to a preset control policy, and sends the control command back to the SCADA server 102.

The AVC device 103 can obtain real-time operation states of all substations in the power grid, monitor the states of all substations according to a partition voltage regulation principle, and timely generate a control instruction according to a preset control strategy to regulate when an abnormality is found.

Since the SCADA server 102 itself has a function of monitoring data, the identification of the abnormal state may be realized by the SCADA server 102 or the AVC apparatus 103.

If the control is realized by the SCADA server 102, the SCADA server 102 recognizes that a certain substation is abnormal in state, and sends the abnormal state of the substation to the AVC device 103, so that the AVC device generates a corresponding control instruction.

If the control is realized by the AVC device 103, the AVC device 103 recognizes that a certain substation is abnormal in state, and directly generates a corresponding control instruction.

It should be noted that the utility model provides a system mainly used 500kV electric wire netting regional control center, present electric wire netting probably manage 220kV voltage and 500kV voltage, consequently probably have 220kV voltage and 500kV voltage in the transformer substation. The preset control strategy aims at the highest voltage qualified rate, and the 500kV voltage is preferentially ensured to be qualified. The voltage is controlled to meet the constraint of the limit value, namely if the 500kV bus voltage is between a preset first upper voltage limit and a preset first lower voltage limit, and the 220kV bus voltage is between a preset second upper voltage limit and a preset second lower voltage limit, the voltage is considered to be qualified. If not, the adjustment can be performed by adjusting the controllable equipment in the substation, wherein the controllable equipment in the substation can include: a capacitor and a reactor.

The basic control strategies are: switching off a capacitor reactor when the bus voltage is higher than the upper voltage limit; when the bus voltage is lower than the lower voltage limit, switching off the reactor and the capacitor; in addition, during control, the voltage of the 500kV bus is qualified, the voltage of the 220kV bus is considered as much as possible, and if the voltage of the 500kV bus is qualified and the voltage of the 220kV bus is not qualified, the voltage of the 220kV bus is adjusted on the basis of ensuring that the voltage of the 500kV bus is qualified; and if the 500kV bus voltage and the 220kV bus voltage are not qualified, the 500kV bus voltage is preferentially ensured to be qualified.

The following situations can be embodied:

1) and if the 500kV bus voltage is higher than a preset first voltage upper limit and the 220kV bus voltage is higher than a preset second voltage upper limit in the state data of the transformer substation, determining that the state of the transformer substation is abnormal, and generating a control command of switching a capacitor and putting a reactor for the transformer substation by the AVC device 103.

2) And if the 500kV bus voltage is lower than a preset first voltage lower limit and the 220kV bus voltage is lower than a preset second voltage lower limit in the state data of the transformer substation, determining that the state of the transformer substation is abnormal, and generating a control command by the AVC device 103 to switch the reactor of the transformer substation into a capacitor.

3) And if the 500kV bus voltage is determined to be qualified and the 220kV bus voltage is higher than the preset second voltage upper limit in the state data of the transformer substation, determining that the state of the transformer substation is abnormal, and switching on a capacitor and a reactor on the basis of ensuring the qualified 500kV bus voltage for the transformer substation by the control instruction generated by the AVC device 103.

4) And if the voltage of the 500kV bus in the state data of the transformer substation is determined to be qualified and the voltage of the 220kV bus is lower than the preset second lower voltage limit, determining that the state of the transformer substation is abnormal, and switching on a reactor on a capacitor on the basis of ensuring the voltage of the 500kV bus to be qualified by the AVC device 103.

5) And if the 500kV bus voltage is determined to be higher than a preset first upper voltage limit and the 220kV bus voltage is determined to be lower than a preset second lower voltage limit in the state data of the transformer substation, determining that the state of the transformer substation is abnormal, and generating a control command of switching a capacitor and putting a reactor for the transformer substation by the AVC device 103.

6) If the 500kV bus voltage is lower than a preset first lower voltage limit and the 220kV bus voltage is higher than a preset second upper voltage limit in the state data of the transformer substation, the state of the transformer substation is determined to be abnormal, and the control instruction generated by the AVC device 103 is to switch on a capacitor of a reactor of the transformer substation.

7) If the 500kV bus voltage is higher than the preset first voltage upper limit and the 220kV bus voltage is qualified in the state data of the transformer substation, the state of the transformer substation is determined to be abnormal, and the AVC device 103 generates a control command for switching a capacitor and putting a reactor into the transformer substation.

8) If the 500kV bus voltage is lower than the preset first lower voltage limit and the 220kV bus voltage is qualified in the state data of the transformer substation, the state of the transformer substation is determined to be abnormal, and the control instruction generated by the AVC device 103 is a capacitor for the reactor switching of the transformer substation.

9) If the voltage of a bus in the state data of the substation is determined not to change, the state of the substation is determined to be abnormal, and the control instruction generated by the AVC device 103 is the bus with unchanged locking voltage for the substation.

10) If it is determined that the state data of the substation indicates that the capacitor or reactor is tripped, it is determined that the substation state is abnormal, and the control instruction generated by the AVC device 103 is to latch the tripped capacitor or reactor for the substation.

The first upper voltage limit is greater than the first lower voltage limit, and the specific value may be set according to actual requirements, for example, the qualified range of the 500kV bus voltage may be set to 530 ± 3kV, the first upper voltage limit may be preset to 533kV, and the first lower voltage limit may be preset to 527 kV. The second upper voltage limit is greater than the second lower voltage limit, and the first upper voltage limit is greater than the second upper voltage limit, and the first lower voltage limit is greater than the second lower voltage limit. Similarly, the specific value may be set according to actual requirements, for example, the qualified range of the 220kV bus voltage may be set to 240 ± 3kV, and then the upper limit of the second voltage may be preset to 243kV, and the lower limit of the second voltage may be preset to 237 kV.

The voltage upper limits may be preset in the SCADA server 102 or the AVC device 103, and if it is determined that the substation is abnormal in state, the voltage upper limits may also be configured by the AVC device 103, that is, the user may set the first voltage upper limit, the first voltage lower limit, the second voltage upper limit, and the second voltage lower limit by the AVC client 106, and the AVC client 106 transmits the first voltage upper limit, the first voltage lower limit, the second voltage upper limit, and the second voltage lower limit set by the user to the AVC device 103. The AVC client 106 may be located at any workstation in the network, such as a human operator workstation, a reporting workstation, a maintenance workstation, and so on.

The AVC apparatus 103 generates a control command and transmits the control command to the SCADA server 102, and the SCADA server 102 generates a corresponding remote control command according to the control command, and transmits the remote control command to the telecontrol apparatus 101 provided at the substation side to which the control command is directed, via the network.

After receiving the remote control instruction sent by the SCADA server 102, the telecontrol device 101 sends the remote control instruction to a device for controlling the substation, i.e., a field measurement and control device 107 shown in the figure.

Also, while passing through the network, the second protocol converter 105 converts the remote control command sent from the SCADA server 102 into a protocol supported by the network, and the first protocol converter 104 converts the remote control command from the network into a protocol supported by the telecontrol device 101.

The site measurement and control device 107 in fig. 1 is provided with each monitoring point in the substation, and there are usually a plurality of monitoring points in the substation, for example, a site measurement and control device is provided for each bus or each capacitor, reactor, etc., so that one remote control device 101 may correspond to a plurality of site measurement and control devices 107. The on-site measurement and control device 107 can perform control operation on the substation according to the remote control instruction (the control operation includes switching of a capacitor and a reactor), and also collects state data of a monitoring point and sends the state data to the telecontrol device 101. That is to say, the telemechanical device 101 receives and summarizes the status data of each site measurement and control device 107 in the substation, thereby realizing the status data acquisition of the substation.

Besides the above-mentioned control of the substation in which the status monitoring and abnormal status occur to each substation, the warning may be performed for abnormal status, or for a substation for which a remote control command is not replied. The function of the alarm may be implemented by the SCADA server 102 or by the AVC apparatus 103.

If the warning function is implemented by SCADA server 102, field measurement and control device 107 in fig. 1 replies to SCADA server 102 via telemechanical device 101 after performing control operation on the substation according to the remote control instruction. If the SCADA server 102 receives the reply (usually, the reply is received within a set time), it is determined that the remote control is successful, and if the reply is not received (usually, the reply is not received within a set time), it is determined that the remote control is failed, and an alarm may be issued.

If the function of the warning is implemented by the AVC apparatus 103, the on-site measurement and control apparatus 107 in fig. 1 replies to the AVC apparatus 103 via the telemechanical apparatus 101 and the SCADA server 102 after performing a control operation on the substation according to the remote control instruction. If the AVC apparatus 103 receives a reply (typically, a reply is received within a set time), it is determined that the control is successful, and if a reply is not received (typically, a reply is not received within a set time), it is determined that the control is failed, and an alarm may be performed.

When the system is specifically arranged in a network, in order to improve the safety and reliability of the system, each device in the system, such as a telecontrol device, a SCADA server, an AVC device, etc., can be set to a primary-standby dual-device configuration, so that the primary device can be switched to the standby device in time when the primary device fails. To give a specific example, as shown in fig. 2.

The above description is only a preferred embodiment of the present invention, and should not be taken as limiting the invention, and any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. An automatic voltage control system of a regional power grid is characterized by comprising more than one telecontrol device, a data acquisition and monitoring SCADA (supervisory control and data acquisition) server and an automatic voltage control AVC (automatic voltage control) device;

2. The system of claim 1, wherein the SCADA server is further configured to determine whether a status anomaly occurs in each substation, and send the status anomaly to the AVC apparatus; or,

the method for determining whether the abnormal state of each transformer substation occurs specifically comprises the following steps:

3. The system according to claim 2, characterized in that if it is determined that the 500kV bus voltage is higher than a preset first upper voltage limit and the 220kV bus voltage is higher than a preset second upper voltage limit in the status data of the substation, the AVC device generates the control instruction to switch the capacitor and switch the reactor for the substation; or,

4. The system of claim 2, wherein if the AVC means determines whether a status anomaly has occurred in each substation, the system further comprises: and the AVC client is used for sending the first upper voltage limit, the first lower voltage limit, the second upper voltage limit and the second lower voltage limit which are set by a user to the AVC device.

5. The system of claim 2, wherein the SCADA server is further configured to alarm a substation with abnormal status or an substation for which a remote control command is not replied;

6. The system according to claim 2, wherein the AVC device is further configured to alarm a substation with abnormal status or an substation for which a remote control command is not replied;

7. The system according to claim 1, wherein said telecontrol apparatus, SCADA server, or AVC apparatus employs a dual active/standby device configuration to switch to a standby device in time when a failure occurs in the active device.

8. The system according to claim 1, characterized in that said means for controlling the operation of the substation are: the field measurement and control device is arranged at each monitoring point in the transformer substation;

9. The system of claim 1, further comprising: