CN113964800B - Wireless differential protection method in operation and fault throttling mode - Google Patents
Wireless differential protection method in operation and fault throttling mode Download PDFInfo
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- 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
- H02H7/26—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured
- H02H7/261—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured involving signal transmission between at least two stations
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H1/00—Details of emergency protective circuit arrangements
- H02H1/0061—Details of emergency protective circuit arrangements concerning transmission of signals
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Abstract
The invention discloses a wireless differential protection method under a mode of distinguishing operation from fault throttling, wherein wireless communication is adopted among line protection devices, HDLC messages are adopted for data transmission, the protection devices normally perform protection starting judgment, and channel starting judgment is increased; during normal operation, namely when the protection is not started and the channel is not started, a heartbeat message is sent, and the sending frequency is in the second level; after the protection starting or the channel starting, the sending frequency is immediately adjusted, meanwhile, the content of sending data is adjusted to be a starting message, the starting at any side is adjusted to be quick sending, and the sending frequency is in millisecond level; the differential protection outlet is provided with a differential element on the side, a protection start on the side, and simultaneously meets the requirements of a protection start on the opposite side, a voltage start on the side or the opposite side channel or a jump position of the opposite side three-phase switch. By adopting the invention, on one hand, the communication flow is saved, and the flow cost generated by the differential protection service is reduced; on the other hand, the differential protection action speed in the weak feed mode is optimized.
Description
Technical Field
The invention belongs to the field of relay protection of power systems, and particularly relates to a wireless differential protection method in a mode of distinguishing operation from fault throttling.
Background
As a main protection widely applied to line protection, the longitudinal current differential protection needs two or more line protection devices to mutually transmit synchronous data, and has higher requirements on rapidness, instantaneity, stability and reliability of a transmission channel due to the requirements on the rapidness and reliability of relay protection. With the development of 5G communication technology, the bandwidth, communication rate, stability and reliability of wireless network data transmission are continuously improved, and the wireless transmission channel is gradually applied to the field of power communication.
The line protection devices in operation transmit data in real time, and the transmission period of the data message is in the order of 1ms, so that a large amount of data can be transmitted with each other along with long-time operation of the equipment. When line protection longitudinal communication channel data transmission is performed by using a 5G wireless communication mode, optimal flow control is required for economy.
The protection starting elements on the two sides of the conventional longitudinal current differential protection requirement and the differential elements on the own side act to allow the differential protection outlet, in a weak feed mode, after the weak feed side receives the opposite side protection starting, the weak feed starting element is judged according to some auxiliary judging conditions, and then a protection starting mark is sent to the strong current side, so that the strong current side receives the protection starting mark on the weak feed side and at least needs twice channel delay time, and when the channel delay time is longer, the action speed of the protection outlet can be greatly influenced.
Disclosure of Invention
The invention aims to provide a wireless differential protection method under a mode of distinguishing operation from fault throttling, which aims to solve the problems that the circuit protection operates for a long time, the channel transmission data volume is huge, the flow consumption is high, and under the weak feedback condition, the weak feedback side protection starts to lag behind the time of one channel delay, so that the strong current side differential protection outlet time is more lagged.
In order to achieve the above purpose, the invention adopts the following technical scheme:
a wireless differential protection method under the mode of distinguishing operation from fault throttling is provided, wherein wireless communication is adopted between line protection devices, HDLC messages are adopted for data transmission, and the method comprises the following steps:
responding to the fact that the home side protection, the home side channel, the opposite side protection and the opposite side channel are not started, the home side sends a first heartbeat message to the opposite side, and sends a second heartbeat message to the opposite side, wherein the sending frequency is of the second level;
responding to the protection start of the home side or the channel start of the home side, the home side adjusts the sending frequency to millisecond level, and adjusts the sending data from a first heartbeat message to a first start message;
responding to a protection starting mark or a channel starting mark in the first starting message, starting a contralateral protection starting or a contralateral channel, adjusting the sending frequency to be millisecond level, and adjusting the sending data from a second heartbeat message to a second starting message;
and judging whether the local differential protection outlet is allowed or not according to the first starting message and the second starting message.
Further, the method for judging the starting of the side channel comprises the following steps:
if the current side meets any one of channel voltage starting, channel TWJ (skip relay) deflection starting and channel long-skip starting, the current side channel is started and the set time is widened.
Further, the method for judging the channel voltage starting comprises the following steps:
if any one of low-voltage starting, zero-sequence voltage starting, phase voltage abrupt starting and zero-sequence voltage abrupt starting is met, channel voltage starting and widening the set time.
Further, the low-voltage starting condition is that the local side phase voltage or the phase-to-phase voltage is lower than a set threshold value, the zero-sequence voltage starting condition is that the local side zero-sequence voltage is higher than the set threshold value, the phase voltage abrupt starting condition is that the local side phase voltage or the phase-to-phase voltage abrupt change is higher than the set threshold value, and the zero-sequence voltage abrupt starting condition is that the local side zero-sequence voltage abrupt change is higher than the set threshold value.
Further, the method for judging the channel TWJ deflection start comprises the following steps: if any single-phase TWJ deflection or three-phase TWJ deflection exists, the channel TWJ deflection is started and broadened for a set time.
Further, the method for judging the channel far jump starting comprises the following steps:
when the local side protects the far jump opposite side, the local side channel is started in a far jump way and widens the set time.
Further, the first start message further includes a three-phase current sampling value, a three-phase current fourier value, a three-phase voltage fourier value, three single-phase TWJ positions or three-phase TWJ positions, an absolute time scale, and a differential protection related flag at the current time of the present side, where the channel start flag includes any one or more of a channel voltage start flag, a channel TWJ start flag, and a channel long jump start flag;
the second start message comprises a three-phase current sampling value, a three-phase current fourier value, a three-phase voltage fourier value, a protection start-up mark, a channel start-up mark, three single-phase TWJ positions or three-phase TWJ positions, an absolute time scale and a differential protection related mark at the opposite side current moment, wherein the channel start-up mark comprises any one or more of a channel voltage start-up mark, a channel TWJ start-up mark and a channel long jump start-up mark.
Further, the determining whether to allow the local differential protection outlet according to the first start message and the second start message includes:
judging whether the differential element of the current side acts or not according to the three-phase current sampling value, the three-phase current Fourier value, the three-phase voltage Fourier value and the differential protection related mark of the current moment of the current side;
judging whether the opposite side three-phase switches are jumpers according to the opposite side three single-phase TWJ positions or the three-phase TWJ positions;
responding to the action of the side differential element and the start of the opposite side protection, or the action of the side differential element and the start of the side protection and the start of the side channel voltage, or the action of the side differential element and the start of the side protection and the start of the opposite side channel voltage, or the action of the side differential element and the start of the side protection and the opposite side three-phase switch are jumpers, and the side differential protection outlet.
Further, the discrimination conditions that the opposite side three-phase switches are jump positions are as follows: in the second start message, all of the three single-phase TWJ are 1 or the three-phase TWJ are 1.
Further, the first heartbeat message comprises a three-phase current Fourier value, a heartbeat message mark, a protection starting mark, a channel starting mark, a three-phase TWJ position and an absolute time mark at the current moment of the local side;
the second heartbeat message comprises a contralateral current moment three-phase current Fourier value, a heartbeat message mark, a protection starting mark, a channel starting mark, a three-phase TWJ position and an absolute time mark.
Further, the distinguishing method of the protection start of the side is as follows:
if the current abrupt change starting, zero sequence current starting, steady destruction starting, weak feed starting and TWJ starting are met, the current side is protected and started and the set time is widened.
The invention achieves the beneficial technical effects that:
1) When the power system normally operates, the optimal flow control logic of the invention is adopted, the channel data transmission frequency is in the second level in most of time, the total channel transmission data volume during normal operation of the line protection is reduced, and the channel data flow is reduced by about 10 3 The flow cost is greatly reduced by times;
2) The channel starting logic can sensitively detect system faults or disturbance, ensures the speed of differential protection after the circuit breaks down by timely adjusting the channel data sending frequency, and controls the delay error to be in millisecond level;
3) For line protection in a weak feed mode, when faults occur in a region, the outlet optimization logic of the invention is adopted, so that the time of the strong current side protection outlet can be shortened by 1 time, and the time of the strong current side differential protection outlet can be greatly reduced under the wireless differential protection working condition;
4) When the system operates normally, channel monitoring and monitoring of differential current at two sides of the line can still be performed through the heartbeat message, so that the reliability of channel transmission is ensured.
Drawings
Fig. 1 is a schematic diagram of a wireless differential protection method implemented in a mode of distinguishing between operation and fault throttling according to an embodiment of the present invention.
Detailed Description
The invention is further described below in connection with specific embodiments. The following examples are only for more clearly illustrating the technical aspects of the present invention, and are not intended to limit the scope of the present invention.
As described above, in the prior art, the line protection is operated for a long time, the amount of data transmitted by the channel is large, the flow consumption is high, the speed and reliability of the line differential protection can be affected by simply reducing the transmission frequency, and in the case of weak feedback, the weak feedback side protection starts to lag the time of one channel delay, so that the time of the strong current side differential protection outlet is more lag.
Therefore, the embodiment of the invention provides a wireless differential protection method in a mode of distinguishing operation from fault throttling, which optimizes the type of a differential protection service message, the format of the message, the sending frequency and the sending rate of data, simplifies the format of the data, improves the efficiency of the message, optimizes the related logic of differential protection, greatly reduces the data flow, does not reduce the performance of differential protection, and simultaneously still has the function of channel monitoring.
In a specific embodiment, the data of the optical fiber differential protection service adopts HDLC protocol message format, and has simple frame structure, high processing speed and high bandwidth utilization rate. The end-to-end communication of differential data is realized by utilizing 5G communication, HDLC whole-frame messages are directly packaged into IP messages, and connectionless UDP messages are adopted to ensure the real-time performance of the data.
The protection device normally performs protection starting judgment. Specifically, the protection start judging method includes: if any one of current abrupt starting, zero sequence current starting, steady destruction starting, weak feed starting and TWJ starting is met, the protection starting is performed, and the protection starting is widened for a certain time.
And on the basis of the protection starting judgment, judging the channel starting is increased. In particular embodiments, channel starts may include channel voltage starts, channel TWJ shift starts, or channel skip starts.
The method for judging the channel start comprises the following steps: if any one of channel voltage starting, channel TWJ deflection starting and channel long jump starting is met, the channel is started and widened for a certain time.
The method for judging the channel voltage starting comprises the following steps: if any one of low-voltage starting, zero-sequence voltage starting, phase voltage abrupt starting and zero-sequence voltage abrupt starting is met, channel voltage starting and stretching are carried out for a certain time.
More specifically, the condition for low voltage start is that the current side phase voltage or the phase-to-phase voltage is lower than a set threshold value.
The zero sequence voltage starting condition is that the zero sequence voltage on the side is larger than a set threshold value.
The judgment condition of the phase voltage abrupt start is that the current side phase voltage or the interphase voltage abrupt quantity is larger than a set threshold value.
The judgment condition of the zero sequence voltage abrupt start is that the zero sequence voltage abrupt quantity on the side is larger than a set threshold value.
The method for judging the deflection start of the channel TWJ comprises the following steps: when any single-phase TWJ shift or three-phase TWJ shift exists, the trigger channel TWJ shift starts and widens for a certain time, for example 100ms.
The method for judging the channel remote jump starting comprises the following steps: when the local side protects the far jump opposite side, the local side channel is started in a far jump way, and the local side channel is widened for a certain time.
Referring to fig. 1, a wireless differential protection method in a mode of distinguishing between operation and fault throttling according to an embodiment of the present invention may include the following steps:
step 11, in response to the fact that the home side protection, the home side channel, the opposite side protection and the opposite side channel are not started, the home side sends a first heartbeat message to the opposite side, and sends a second heartbeat message to the opposite side, wherein the sending frequency is in the second level;
during normal operation of the system, i.e. when the protection of the home side and the opposite side is not started and the channel is not started, heartbeat messages are mutually sent between the home side and the opposite side, i.e. the home side sends a first heartbeat message to the opposite side, and sends a second heartbeat message to the home side, wherein the heartbeat messages are sent in the whole second period, and the sending frequency is in the second level, for example 1 frame/second.
The first heartbeat message comprises a three-phase current Fourier value, a heartbeat message mark, a protection starting mark, a channel starting mark, a three-phase TWJ position, an absolute time mark and the like at the current moment of the local side. The start flag is respectively indicated by 1 and 0, so that the first heartbeat message protects the start flag from 0 and the channel start flag is also 0.
The second heartbeat message comprises a three-phase current Fourier value at the current moment of the opposite side, a heartbeat message mark, a protection starting mark, a channel starting mark, a three-phase TWJ position, an absolute time mark and the like.
When the system operates normally, channel monitoring and monitoring of differential current at two sides of the line can still be performed through the heartbeat message, so that the reliability of channel transmission is ensured.
Step 12, in response to the protection start of the home side or the channel start of the home side, the home side adjusts the sending frequency to millisecond level, and adjusts the sending data from the first heartbeat message to the first start message;
when the system has faults or disturbance, when the protection of the local side is started or a channel is started, the local side immediately adjusts the sending frequency to be in the millisecond level, for example, 1 frame/millisecond, simultaneously adjusts the sending data content to be a first starting message, and transmits a starting mark of the local side to the opposite side.
The first start message includes a three-phase current sampling value, a three-phase current fourier value, a three-phase voltage fourier value, a protection start-up flag, a channel start-up flag, three single-phase TWJ positions or three-phase TWJ positions, an absolute time scale, a differential protection related flag, and the like at the current moment of the local side. The channel starting mark comprises any one or more of a channel voltage starting mark, a channel TWJ starting mark and a channel far jump starting mark.
Step 13, responding to a protection start mark or a channel start mark in the first start message, starting the opposite side protection start or the opposite side channel start, adjusting the sending frequency to be millisecond level, and adjusting the sending data to be a second start message from a second heartbeat message;
after the opposite side receives the starting mark of the opposite side, the sending frequency is immediately adjusted to be in millisecond level, namely, any side is started, and the sending frequency is adjusted to be fast to send.
The second start message includes a three-phase current sampling value, a three-phase current fourier value, a three-phase voltage fourier value, a protection start flag, a channel start flag, three single-phase TWJ positions or three-phase TWJ positions, an absolute time scale, a differential protection related flag, and the like at the current moment of the opposite side. Wherein the channel start-up flag comprises any one or more of a channel voltage start-up flag, a channel TWJ start-up flag and a channel far jump start-up flag.
When the system has faults or disturbance, a starting message mode with higher frequency is adopted, so that the rapidity of differential protection can be ensured.
And step 14, judging whether the local differential protection outlet is allowed or not according to the first starting message and the second starting message.
The method specifically comprises the following steps:
judging whether the differential element of the current side acts or not according to the three-phase current sampling value, the three-phase current Fourier value, the three-phase voltage Fourier value and the differential protection related mark of the current moment of the current side;
judging whether the opposite side three-phase switches are jumpers according to the opposite side three single-phase TWJ positions or the three-phase TWJ positions;
responding to the action of the side differential element and the start of the opposite side protection, or the action of the side differential element and the start of the side protection and the start of the side channel voltage, or the action of the side differential element and the start of the side protection and the start of the opposite side channel voltage, or the action of the side differential element and the start of the side protection and the opposite side three-phase switch are jumpers, and the side differential protection outlet.
In one embodiment, the discrimination conditions for the jump of the opposite three-phase switch are as follows: in the second starting message received by the side, all three single-phase TWJ are 1 or three-phase TWJ are 1.
In one embodiment, the sampling frequency of the current main line protection device is 1200Hz, for HDLC messages, each frame of data is not more than about 200 bytes, UDP and IP message header is added, each frame of data is not more than about 300 bytes, calculated in 300 bytes, the data flow per second is about 1200 x 300 b=360 KB, the data flow per day is about 24 x 60 x 360kb≡31GB ≡!
When the power system is in normal operation, most of the time, no faults or disturbances exist. With the optimal flow control logic of the present invention, the channel data transmission frequency is in the order of seconds for most of the time, and the channel data flow is reduced by about 10 percent 3 Multiple times.
The channel starting logic can sensitively detect system faults or disturbance, timely adjust the channel data sending frequency, ensure the quick action of differential protection after faults and control delay errors at millisecond level.
For line protection in a weak current mode, when faults occur in a region, a strong current side can start current mutation, the weak current side possibly does not meet current quantity starting conditions, weak current starting judgment is needed to be carried out according to auxiliary judgment after a protection starting signal of the strong current side is received, and then the weak current starting signal is sent to the strong current side to open a differential protection outlet of the strong current side. For a special fiber channel, the channel delay is about 1ms, the action time of the strong current side is delayed by 2ms due to the channel delay, and can be ignored, but for a wireless channel, the channel delay can reach 10ms level at maximum, the differential protection outlet time of the weak feed side is delayed by 10ms due to the channel delay, and the outlet time of the strong current side is delayed by 20ms due to the channel delay, so that the protection outlet time can be seriously influenced. After the exit optimization logic is adopted, the time of the strong current side protection exit can be shortened by 1 time, and the time of the strong current side differential protection exit can be greatly reduced under the working condition of wireless differential protection.
By adopting the method of the invention, when the system is in normal operation, the channel monitoring and the monitoring of differential current at two sides of the line can still be carried out through the heartbeat message, thereby ensuring the reliability of channel transmission.
Through the above embodiments, the method of the present invention has the following features and functions:
(1) Under the normal operation condition of the system, the data is transmitted by adopting a heartbeat message mode with slower frequency, the data flow is greatly reduced, and meanwhile, the system still has the functions of channel monitoring and abnormal system operation monitoring, and the reliability of channel operation and system operation is ensured.
(2) When the system has faults or disturbance, a starting message mode with higher frequency is adopted, so that the rapidity of differential protection is ensured.
(3) The differential protection outlet logic in the weak feed mode is optimized, and the time of the differential protection outlet on the strong current side in the weak feed mode is accelerated.
On the premise of meeting the requirements of relay protection speed and reliability, the method reduces overall transmission data, saves flow, achieves the effect of optimal flow control, optimizes weak feedback starting logic, improves the action speeds of two sides in a weak feedback mode, and provides a key step for the popularization of 5G differential protection service.
The present invention has been disclosed in the preferred embodiments, but the invention is not limited thereto, and the technical solutions obtained by adopting equivalent substitution or equivalent transformation fall within the protection scope of the present invention.
Claims (10)
1. The wireless differential protection method under the mode of distinguishing operation from fault throttling is characterized in that wireless communication is adopted between line protection devices, HDLC messages are adopted for data transmission, and the method comprises the following steps:
responding to the fact that the home side protection, the home side channel, the opposite side protection and the opposite side channel are not started, the home side sends a first heartbeat message to the opposite side, and sends a second heartbeat message to the opposite side, wherein the sending frequency is of the second level;
responding to the protection start of the home side or the channel start of the home side, the home side adjusts the sending frequency to millisecond level, and adjusts the sending data from a first heartbeat message to a first start message;
responding to a protection starting mark or a channel starting mark in the first starting message, starting a contralateral protection starting or a contralateral channel, adjusting the sending frequency to be millisecond level, and adjusting the sending data from a second heartbeat message to a second starting message;
and judging whether the local differential protection outlet is allowed or not according to the first starting message and the second starting message.
2. The method for distinguishing between operation and fault throttling as claimed in claim 1, wherein the method for distinguishing between start of the present channel is as follows:
if the current side meets any one of channel voltage starting, channel TWJ deflection starting and channel long jump starting, the current side channel is started and broadened for a set time.
3. The method for distinguishing between operation and fault throttling modes according to claim 2, wherein the method for distinguishing between channel voltage starts is as follows:
if any one of low-voltage starting, zero-sequence voltage starting, phase voltage abrupt starting and zero-sequence voltage abrupt starting is met, channel voltage starting and widening the set time.
4. The method for protecting wireless differential motion in a mode of distinguishing operation from fault throttling according to claim 3, wherein the low voltage starting condition is that the local side phase voltage or the inter-phase voltage is lower than a set threshold value, the zero sequence voltage starting condition is that the local side zero sequence voltage is higher than the set threshold value, the phase voltage abrupt starting condition is that the local side phase voltage or the inter-phase voltage abrupt change is higher than the set threshold value, and the zero sequence voltage abrupt starting condition is that the local side zero sequence voltage abrupt change is higher than the set threshold value.
5. The method for wireless differential protection in a mode of distinguishing between operation and fault throttling as claimed in claim 2, wherein the conditions for determining the start of TWJ displacement of the channel are: if any single-phase TWJ deflection or three-phase TWJ deflection exists, the channel TWJ deflection is started and broadened for a set time.
6. The method for distinguishing between operation and fault throttling modes according to claim 2, wherein the method for distinguishing between channel remote start is as follows:
when the local side protects the far jump opposite side, the local side channel is started in a far jump way and widens the set time.
7. The method for wireless differential protection in a mode of distinguishing between operation and fault throttling according to claim 1, wherein the first start message includes three-phase current sampling values, three-phase current fourier values, three-phase voltage fourier values, a protection start flag, a channel start flag, three single-phase TWJ positions or three-phase TWJ positions, an absolute time scale, and a differential protection related flag at the present moment of the present side, where the channel start flag includes any one or more of a channel voltage start flag, a channel TWJ start flag, and a channel long jump start flag;
the second start message comprises a three-phase current sampling value, a three-phase current fourier value, a three-phase voltage fourier value, a protection start-up mark, a channel start-up mark, three single-phase TWJ positions or three-phase TWJ positions, an absolute time scale and a differential protection related mark at the opposite side current moment, wherein the channel start-up mark comprises any one or more of a channel voltage start-up mark, a channel TWJ start-up mark and a channel long jump start-up mark.
8. The method for wireless differential protection in a mode of distinguishing between operation and fault throttling as claimed in claim 7, wherein said determining whether to allow the local differential protection exit according to the first start message and the second start message includes:
judging whether the differential element of the current side acts or not according to the three-phase current sampling value, the three-phase current Fourier value, the three-phase voltage Fourier value and the differential protection related mark of the current moment of the current side;
judging whether the opposite side three-phase switches are jumpers according to the opposite side three single-phase TWJ positions or the three-phase TWJ positions;
responding to the action of the side differential element and the start of the opposite side protection, or the action of the side differential element and the start of the side protection and the start of the side channel voltage, or the action of the side differential element and the start of the side protection and the start of the opposite side channel voltage, or the action of the side differential element and the start of the side protection and the opposite side three-phase switch are jumpers, and the side differential protection outlet.
9. The method for wireless differential protection in a mode of distinguishing between operation and fault throttling as claimed in claim 8, wherein the conditions for distinguishing the opposite three-phase switch from each other are: in the second start message, all of the three single-phase TWJ are 1 or the three-phase TWJ are 1.
10. The method for protecting wireless differential motion in a mode of distinguishing operation from fault throttling according to claim 1, wherein the first heartbeat message comprises a three-phase current fourier value, a heartbeat message mark, a protection start mark, a channel start mark, a three-phase TWJ position and an absolute time scale at the current moment of the present side;
the second heartbeat message comprises a contralateral current moment three-phase current Fourier value, a heartbeat message mark, a protection starting mark, a channel starting mark, a three-phase TWJ position and an absolute time mark.
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| CN101431230A (en) * | 2008-12-17 | 2009-05-13 | 中国南方电网有限责任公司 | Transforming plant integrated protection system based on IEC61850 |
| CN103022993A (en) * | 2012-11-23 | 2013-04-03 | 上海交通大学 | Adaptive cascade direction interlocking relaying method based on GOOSE (Generic Object Oriented Substation Event) |
| CN105375635A (en) * | 2015-12-02 | 2016-03-02 | 国家电网公司 | Method and system of intelligent management of power distribution network cascading switching stations |
| CN109980612A (en) * | 2019-02-27 | 2019-07-05 | 南京国电南自电网自动化有限公司 | A kind of method that line differential protection realizes weak feedback starting using zero-sequence fault component |
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