CN105490832A - Modeling method for communication delay of wide area closed loop control system in electrical power system - Google Patents
Modeling method for communication delay of wide area closed loop control system in electrical power system Download PDFInfo
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- CN105490832A CN105490832A CN201510793516.0A CN201510793516A CN105490832A CN 105490832 A CN105490832 A CN 105490832A CN 201510793516 A CN201510793516 A CN 201510793516A CN 105490832 A CN105490832 A CN 105490832A
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- communication delay
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L41/00—Arrangements for maintenance, administration or management of data switching networks, e.g. of packet switching networks
- H04L41/14—Network analysis or design
- H04L41/145—Network analysis or design involving simulating, designing, planning or modelling of a network
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L41/00—Arrangements for maintenance, administration or management of data switching networks, e.g. of packet switching networks
- H04L41/14—Network analysis or design
- H04L41/142—Network analysis or design using statistical or mathematical methods
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L41/00—Arrangements for maintenance, administration or management of data switching networks, e.g. of packet switching networks
- H04L41/14—Network analysis or design
- H04L41/147—Network analysis or design for predicting network behaviour
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L43/00—Arrangements for monitoring or testing data switching networks
- H04L43/08—Monitoring or testing based on specific metrics, e.g. QoS, energy consumption or environmental parameters
- H04L43/0852—Delays
Abstract
The invention provides a modeling method for communication delay of a wide area closed loop control system in an electrical power system. The modeling method comprises a first step of obtaining a linear estimation model of communication delay of the wide area closed loop control system according to a special application condition of the wide area closed loop control system in the electrical power system, wherein the linear estimation model is as shown in the description, Tt is communication delay, Tt0 is a constant term of the linear estimation model, R is a channel link bandwidth and is a fixed value when the communication channel is not changed, and L is data package size; a second step of changing sizes of tested data packages, and measuring to obtain communication delays Tt under the condition of different tested data packages; and a third step of calculating, according to different communication delays under the condition of different tested data package sizes, to obtain values of Tt0 and R, then finishing modeling of the communication delay of the communication channel. Through adoption of the method, the modeling problem in the prior art that the communication delay of the wide area closed loop control system in the electrical power system cannot be calculated is solved.
Description
Technical field
The present invention relates to electrical power system wide-area Closed loop Control field, particularly relate to a kind of modeling method of electrical power system wide-area closed-loop control system communication delay.
Background technology
Wide area is interconnected is one of current electric power system main development direction, and interconnected wide area power system significantly can improve safety and reliability, is conducive to realizing most optimum distribution of resources simultaneously.But interconnected wide area power system is also faced with new problem.Power low-frequency oscillation between interconnection region has a strong impact on power system security, and reduces the efficiency of transmission of electric energy, must solve the low-frequency oscillation problem of electric power system for this reason.Wide area closed-loop control system is one of effective means solving low-frequency oscillation problem.
In electrical power system wide-area closed-loop control system, phasor measurement unit PMU, Wide Area Network Control Server WNCS and net control terminal NCU correspond respectively to transducer, controller and actuator in control system.Transmitted by electric power system high-speed communicating network between PMU, WNCS and NCU.Different from traditional control system, feedback signal (i.e. measurement data) in wide area closed-loop control system and control signal are all transmitted by high-speed communicating network, and the time delay that therefore control based on network causes is the key factor affecting wide area closed-loop control system performance.
Communication delay (i.e. network transfer delay) is the important component part of wide area closed-loop control system time delay, in order to study the delay character of wide area closed-loop control system to realize the compensation to time delay influence further, need to measure and modeling the communication delay in wide area closed-loop control system.
Summary of the invention
Technical problem to be solved by this invention is the modeling problem that prior art can not realize the calculating of electrical power system wide-area closed-loop control system communication delay.
In order to solve the problem, the invention discloses a kind of modeling method of electrical power system wide-area closed-loop control system communication delay, described modeling method comprises the steps:
Step 1, special applications condition according to electrical power system wide-area closed-loop control system, obtain the Linear Estimation model of wide area closed-loop control system communication delay:
Wherein, Tt is communication delay; Tt0 is the constant term of Linear Estimation model; R is channel link bandwidth, is fixed value under the condition that communication port is constant; L is data package size;
Step 2, the size of described test packet of changing, measure the communication delay Tt obtained under different test packet;
Step 3, according to the different communication delay under different test packet size condition, calculate the value of Tt0 and R, complete the modeling of the communication delay of this communication port.
Further, the method for measurement by measuring the communication delay Tt obtained under different test packet in described step 2 comprises the following steps:
Step 2.1, send a test packet by the main website end test machine being positioned at power system dispatching center, described test packet is sent to substation end test machine, and records the test machine x time Ts of described main website end;
Step 2.2, described substation end test machine respond described test packet;
Step 2.3, described main website end test machine receive described substation end test machine to the response of described test packet, record the Tr time of reception;
Step 2.4, calculate delivery time Ts and the time of reception Tr time difference, namely this communication delay Tt recorded is:
Tt＝Tr-Ts；
Step 2.5, adjust the size of described test packet, repeat above-mentioned steps 1 ~ 4, obtain the communication delay Tt under different test packet.
Further, in described step 2, for a fixed-size described test packet, communication delay Tt is taken multiple measurements, mean value computation is carried out to measurement result, obtains the mean value of communication delay Tt.
Further, in described step 3, use Linear Estimation model to carry out linear fit and can obtain the parameter Tt0 of Linear Estimation model and the value of R.
Further, described x time Ts and described time of reception Tr be benchmark with the local clock of described main website end test machine.
Further, described substation end test machine, after receiving described test packet, does not perform any process, described test packet is back to described main website end test machine immediately, and continues the next described test packet of wait-receiving mode.
Compared with prior art, the present invention has the following advantages:
1, communication delay method of measurement of the present invention can send the packet of arbitrary size, not only can record the communication delay under particular data packet size cases, also can be used for the parameter obtaining the Linear Estimation model that the present invention proposes.
2, the Linear Estimation model of communication delay of the present invention considers the high-speed communicating network characteristic of electrical power system wide-area closed-loop control system, communication delay is simplified and is modeled as the Linear Estimation model linear with data package size, enormously simplify the modeling method to communication delay.
3, communication delay Linear Estimation model parameter acquisition methods of the present invention combines with the method for measurement of communication delay, can obtain the parameter of Linear Estimation model according to the statistical value of the communication delay measured.
Accompanying drawing explanation
Fig. 1 is the schematic flow sheet of the modeling method of the preferred embodiments of the present invention;
Fig. 2 is the method for measurement schematic flow sheet of the communication delay Tt obtained in the modeling method of the preferred embodiments of the present invention under different test packet.
Embodiment
For enabling above-mentioned purpose of the present invention, feature and advantage become apparent more, are described in further detail below in conjunction with drawings and Examples.
As shown in Figure 1, in a preferred embodiment of the invention, provide a kind of modeling method of electrical power system wide-area closed-loop control system communication delay, it is characterized in that, described modeling method comprises the steps:
Step S1, special applications condition according to electrical power system wide-area closed-loop control system, obtain the Linear Estimation model of wide area closed-loop control system communication delay:
Wherein, Tt is communication delay; Tt0 is the constant term of Linear Estimation model; R is channel link bandwidth, is fixed value under the condition that communication port is constant; L is data package size;
Step S2, change the size of described test packet, measure the communication delay Tt obtained under different test packet;
Step S3, the communication delay under different condition is brought into the Linear Estimation model of foundation;
Step S4, according to the different communication delay under different test packet size condition, calculate the value of Tt0 and R, complete the modeling of the communication delay of this communication port.
By this method, can set up one effective practical, and relatively simple linear model is for calculating electrical power system wide-area closed-loop control system communication delay.
As shown in Figure 2, the method for measurement by measuring the communication delay Tt obtained under different test packet in described step S2 comprises the following steps:
Step S2.1, send a test packet by the main website end test machine being positioned at power system dispatching center, described test packet is sent to substation end test machine, and records the test machine x time Ts of described main website end;
Step S2.2, described substation end test machine respond described test packet;
Step S2.3, described main website end test machine receive described substation end test machine to the response of described test packet, record the Tr time of reception;
Step S2.4, calculate delivery time Ts and the time of reception Tr time difference, namely this communication delay Tt recorded is:
Tt＝Tr-Ts；
Step S2.5, adjust the size of described test packet, repeat above-mentioned steps 1 ~ 4, obtain the communication delay Tt under different test packet.
In described step S2, for a fixed-size described test packet, communication delay Tt is taken multiple measurements, mean value computation is carried out to measurement result, obtains the mean value of communication delay Tt.By to the repetitive measurement of same test packet and the method for computation of mean values measures communication delay Tt, can effectively reduce in measuring process owing to artificially measuring the measure error of slipping up and causing.
In described step S3, use Linear Estimation model to carry out linear fit and can obtain the parameter Tt0 of Linear Estimation model and the value of R.
Described x time Ts and described time of reception Tr be benchmark with the local clock of described main website end test machine.
Described substation end test machine, after receiving described test packet, does not perform any process, described test packet is back to described main website end test machine immediately, and continues the next described test packet of wait-receiving mode.
By the application of technique scheme, method tool of the present invention has the following advantages:
1, communication delay method of measurement of the present invention can send the packet of arbitrary size, not only can record the communication delay under particular data packet size cases, also can be used for the parameter obtaining the Linear Estimation model that the present invention proposes.
2, the Linear Estimation model of communication delay of the present invention considers the high-speed communicating network characteristic of electrical power system wide-area closed-loop control system, communication delay is simplified and is modeled as the Linear Estimation model linear with data package size, enormously simplify the modeling method to communication delay.
3, communication delay Linear Estimation model parameter acquisition methods of the present invention combines with the method for measurement of communication delay, can obtain the parameter of Linear Estimation model according to the statistical value of the communication delay measured.
Above to the modeling method of a kind of electrical power system wide-area closed-loop control system communication delay that the embodiment of the present invention provides, be described in detail, apply specific case herein to set forth principle of the present invention and execution mode, the explanation of above embodiment just understands core concept of the present invention for helping; Meanwhile, for one of ordinary skill in the art, according to the thought of the embodiment of the present invention, all will change in specific embodiments and applications, in sum, this description should not be construed as the restriction to the embodiment of the present invention.
Claims (6)
1. a modeling method for electrical power system wide-area closed-loop control system communication delay, is characterized in that, described modeling method comprises the steps:
Step 1, special applications condition according to electrical power system wide-area closed-loop control system, obtain the Linear Estimation model of wide area closed-loop control system communication delay:
Wherein, Tt is communication delay; Tt0 is the constant term of Linear Estimation model; R is channel link bandwidth, is fixed value under the condition that communication port is constant; L is data package size;
Step 2, the size of described test packet of changing, measure the communication delay Tt obtained under different test packet;
Step 3, according to the different communication delay under different test packet size condition, calculate the value of Tt0 and R, complete the modeling of the communication delay of this communication port.
2. according to the method described in claim 1, it is characterized in that, the method for measurement by measuring the communication delay Tt obtained under different test packet in described step 2 comprises the following steps:
Step 2.1, send a test packet by the main website end test machine being positioned at power system dispatching center, described test packet is sent to substation end test machine, and records the test machine x time Ts of described main website end;
Step 2.2, described substation end test machine respond described test packet;
Step 2.3, described main website end test machine receive described substation end test machine to the response of described test packet, record the Tr time of reception;
Step 2.4, calculate delivery time Ts and the time of reception Tr time difference, namely this communication delay Tt recorded is:
Tt＝Tr-Ts；
Step 2.5, adjust the size of described test packet, repeat above-mentioned steps 1 ~ 4, obtain the communication delay Tt under different test packet.
3. according to the method described in claim 2, it is characterized in that, in described step 2, for a fixed-size described test packet, communication delay Tt is taken multiple measurements, mean value computation is carried out to measurement result, obtains the mean value of communication delay Tt.
4. according to the method described in claim 1, it is characterized in that, in described step 3, use Linear Estimation model to carry out linear fit and can obtain the parameter Tt0 of Linear Estimation model and the value of R.
5., according to the method described in claim 2, it is characterized in that, described x time Ts and described time of reception Tr be benchmark with the local clock of described main website end test machine.
6. according to the method described in claim 2, it is characterized in that, described substation end test machine, after receiving described test packet, does not perform any process, described test packet is back to described main website end test machine immediately, and continues the next described test packet of wait-receiving mode.
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Citations (3)
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| CN102738793A (en) * | 2012-07-09 | 2012-10-17 | 武汉大学 | Electric system wide area dynamical control method and system for compensating distributive communication time delay |
| US20130018515A1 (en) * | 2010-03-17 | 2013-01-17 | Rajat Majumder | Enhancing Wide Area Control Reliability Of A Power Transmission System |
| CN104392069A (en) * | 2014-12-11 | 2015-03-04 | 国家电网公司 | Modeling method for time delay characteristics of WAMS (wide area measurement system) |
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- 2015-11-17 CN CN201510793516.0A patent/CN105490832A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20130018515A1 (en) * | 2010-03-17 | 2013-01-17 | Rajat Majumder | Enhancing Wide Area Control Reliability Of A Power Transmission System |
| CN102738793A (en) * | 2012-07-09 | 2012-10-17 | 武汉大学 | Electric system wide area dynamical control method and system for compensating distributive communication time delay |
| CN104392069A (en) * | 2014-12-11 | 2015-03-04 | 国家电网公司 | Modeling method for time delay characteristics of WAMS (wide area measurement system) |
Non-Patent Citations (2)
| Title |
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| ZHIYUAN DUAN等: ""Robust Control of Interconnected Power System Based on WAMS Considering Signals Transmission Delay"", 《POWER AND ENERGY ENGINEERING CONFERENCE, 2009. APPEEC 2009. ASIA-PACIFIC》 * |
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