CN105629107A - Station clock synchronization fault online monitoring method - Google Patents

Station clock synchronization fault online monitoring method Download PDF

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Publication number
CN105629107A
CN105629107A CN201511018116.9A CN201511018116A CN105629107A CN 105629107 A CN105629107 A CN 105629107A CN 201511018116 A CN201511018116 A CN 201511018116A CN 105629107 A CN105629107 A CN 105629107A
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communication line
plant stand
pmu
impedance
voltage
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CN201511018116.9A
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CN105629107B (en
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段刚
杨东
刘刚
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Beijing Sifang Automation Co Ltd
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Beijing Sifang Automation Co Ltd
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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Telephonic Communication Services (AREA)

Abstract

The invention discloses a clock synchronization fault discovery method for all transformer substations or power plants only based on phase measurement data of a wide area measurement system (WAMS) main station. According to the method, firstly impedance of one line between the transformer substations having direct connection lines or phase angle difference between isolated PMU stations (groups) is calculated, then percentage error of the calculated impedance of each line and actual impedance (or average impedance of the corresponding period of the other day) or deviation of phase angle difference of voltage of the two ends of a virtual connection line and the statistic value of the other day is calculated and a deviation threshold is set, and the connection lines of which line impedance or phase angle deviation is greater than the threshold are disconnected so that multiple connection islands only including the PMU stations are formed. A prompt for inspection of a clock synchronization problem is given to the connection islands apart from the connection islands including the most stations or the isolated stations. A clock synchronization fault can be timely and independently discovered so that reliability of the power grid safety and stability decision can be enhanced.

Description

A kind of plant stand lockstep failure on-line monitoring method
Technical field
The invention belongs to power system clock synchronization field, in particular to one only based on phasor measurement information, utilize impedance computation technology to realize the technology of plant stand clock synchronization apparatus malfunction monitoring.
Background technology
Along with the extensive employing of synchronized phasor measurement technology in power system, the dynamic operation behavior of electrical network can be carried out observation real-time fast according to the phasor measurement information of wide area by the operation personnel of grid control centre, the safe and stable operation problem of Timeliness coverage electrical network. The basis of synchronous phasor measurement is the synchronous technology of satellite clock, but, satellite clock synchronous device can lose synchronously due to various reason, and produces very big timing error. The fault of Timeliness coverage clock synchronization system, it is possible to avoid the mistake due to synchronized phasor data, causes the erroneous judgement to power system safety and stability. Represented by a lot of situation, synchronous phasor measuring device fault can have on its quality bit, but when corresponding synchronous fault is not within the supervision scope of quality bit or when quality bit mark there is fault, the synchronous fault of phasor measuring set can not be known by the operation personnel of main website, therefore exist according to the risk that nonsynchronous mistake phasor data is made harm power system safety and stability and run.
Its phasor data used of management and running personnel's Timeliness coverage of control center how is allowed to exist disclosed in synchronous problem also do not have at present, the solution of system. The present invention proposes one only based on the phasor measurement data of wide area measurement system (WAMS) main website, by the method for each substation of impedance computation Timeliness coverage or power station lockstep failure, the method is for simple grid control centre personnel, intuitive and reliable, it is possible to the fault of Timeliness coverage plant stand clock synchronization system.
Summary of the invention
In order to allow its phasor data used of management and running personnel's Timeliness coverage of grid control centre there is synchronous problem, the present invention propose one only phasor measurement data based on wide area measurement system (WAMS) main website find each substation or the method for power station lockstep failure.
The present invention is concrete by the following technical solutions:
A kind of plant stand lockstep failure monitoring method, it is characterized in that: by phase difference of voltage between the impedance of communication line direct between calculating substation or power station or virtual communication line end node relative to the change of actual value or history value, find the lockstep failure between plant stand and power station and/or substation, and there is according to the consistence location of clock synchronization between plant stand the plant stand of synchronous fault.
Described plant stand lockstep failure monitoring method specifically comprises the following steps:
Step 1: in the same electrical island of power system, all it is being provided with between each substation of phasor measurement unit PMU and each power station namely to set up a minimum connected network N between PMU plant stand, namely with the actual network that directly plant stand being respectively provided with PMU is connected by communication line or virtual communication line of minimal number;
Step 2: voltage and the electric current phasor measuring value obtaining each communication line two ends in past setting-up time section;
Step 3: calculation procedure 2 sets the phase difference of voltage �� between impedance magnitude | Z | of each direct communication line of each sampling instant in the period and virtual communication line end node, and ask for statistical expectation within this period of impedance magnitude and end node phase difference of voltage and mean value | Z |EAnd ��E;
Step 4: expected value | Z | of the computing impedance amplitude of each direct communication line tried to achieve in calculation procedure 3EWith practical impedance amplitude | Z |rPercent deviation ez, and phase difference of voltage expected value �� between virtual communication line end nodeEAnd the day before yesterday is with phase difference of voltage expected value �� between this virtual communication line end node of periodE-prePercent deviation e��;
Step 5: according to the impedance percent deviation threshold value ER of settingzOr phase angle difference percent deviation threshold value ER��, select impedance percent deviation ezIt is greater than ERzDirect communication line or phase angle difference percent deviation e��It is greater than ER��Virtual communication line as problem circuit;
Step 6: for minimum connected network N, the problem circuit selected in break step 5, thus forms some islands only contained the son connection island of PMU plant stand and be namely made up of part circuit and the node of former minimum connection networking N, or isolated PMU plant stand;
Step 7: order comprises the son connection Dao Weizhu island of maximum PMU plant stand, and get rid of the PMU plant stand that it comprises, then there is clock synchronization extremely in remaining sub-connection island and isolated PMU plant stand, to the PMU plant stand that wherein isolated PMU plant stand is directly connected with son connection Dao Zhongyuzhu island, provide the alarm checking its clock synchronous abnormality.
The present invention also preferably includes following scheme further:
In step (1), the establishment method of minimum connected network N is as follows: first selects the actual communication line between PMU plant stand and direct communication line, and selects 1; If having between the substation of PMU or power station without direct communication line, then between these two PMU plant stands, select to connect between electrically nearest node virtual communication line.
In step 3, for direct communication line computing impedance amplitude | Z | adopt following formula try to achieve:
| Z | = | R + j X | = | U · F 2 - U · T 2 I · F U · T - I · T U · F |
WhereinIt is respectively circuit top voltage, terminal voltage, top electric current, end current phasor;
Phase difference of voltage �� between virtual communication line end node is by virtual communication line top voltage phase angle ��UFWith virtual communication line terminal voltage phase angle ��UTDifference try to achieve:
��=��UF-��UT��
In step 4, if without practical impedance amplitude | Z | of direct communication liner, then with expected value | Z | with the impedance magnitude of this direct communication line of period day before yesterdayE-preSubstitute.
In steps of 5, ERzSpan is 20%-40%, ER��Span is 40-60%, it is preferable that ERz is 30%, ER��It is 50%.
The present invention implement by the operation personnel making grid control centre only according to have the substation of phasor measuring set, power station daily on send whether the voltage phasor of scheduling station, electric current phasor just can the corresponding plant stand clock synchronization system of Timeliness coverage have problems, avoid the supervision on the spot and the analytical system that too much rely on plant stand, be conducive in time, independently finding lockstep failure, it is to increase the reliability of electricity net safety stable decision-making.
Accompanying drawing explanation
Fig. 1 is based on the plant stand lockstep failure monitoring method schema of phasor impedance computation.
Embodiment
Below in conjunction with Figure of description and specific embodiment, the technical scheme of the present invention is described in further detail.
It is illustrated in figure 1 the plant stand lockstep failure monitoring method schema based on phasor impedance computation. plant stand lockstep failure monitoring method module proposed by the invention runs the wide area measurement system platform in dispatching of power netwoks control center. each has the power station of phasor measuring set and substation by synchronous phasor measurement data to send scheduling station in the high frequency speed such as 50 frames/second, it is stored in synchronized phasor real-time database and the history library of main website, the line impedance (and phase angle) of the method that the clock synchronization monitoring modular of main website is carried according to this patent based on synchronized phasor real-time database information between each substation of line computation, and compare with real impedance values or history impedance value (and phase angle), the lockstep failure between plant stand is found by its difference, and the consistence according to clock synchronization between plant stand locates the plant stand with synchronous fault. it specifically comprises the following steps:
Step 1: in the same electrical island (namely charged and the system of all electric network elements formation that is that be mutually directly connected) of power system, all it is being equipped with between each substation of phasor measuring set PMU and each power station to set up a minimum connected network N, namely with the actual network that directly plant stand being respectively provided with PMU is connected by communication line or virtual communication line of minimal number; Wherein the system of selection of communication line is as follows: the actual communication line between prioritizing selection PMU plant stand, and selects 1; If have PMU substation or between plant stand group and other PMU plant stand groups without direct-connected circuit, then between these two PMU plant stand groups, select to connect between electrically nearest node virtual communication line;
Step 2: the voltage and the electric current phasor that obtain each communication line two ends in past setting-up time section measure, and it was 5 seconds that the embodiment of the present application preferably sets the period;
Step 3: calculation procedure 2 sets the phase difference of voltage �� between impedance | Z | of each direct communication line of each sampling instant in the period and virtual communication line end node, and ask for statistical expectation within this period of impedance magnitude and end node phase difference of voltage and mean value | Z |EAnd ��E;
Step 3 adopts following formula to try to achieve for computing impedance amplitude | Z | of direct communication line:
| Z | = | R + j X | = | U · F 2 - U · T 2 I · F U · T - I · T U · F |
WhereinBeing respectively circuit top voltage, terminal voltage, top electric current, end current phasor, obtains all in step 2.
In step 3, phase difference of voltage �� between virtual communication line end node is by virtual communication line top voltage phase angle ��UFWith virtual communication line terminal voltage phase angle ��UTDifference try to achieve:
��=��UF-��UT;
Step 4: expected value | Z | of the computing impedance amplitude of each direct communication line tried to achieve in calculation procedure 3EWith practical impedance amplitude | Z |rIf (without practical impedance amplitude | Z |R,Then with expected value | Z | with period impedance magnitude day before yesterdayE-preSubstitute) percent deviation ez, and phase angle difference expected value �� between virtual communication line end nodeEAnd a few days ago with phase difference of voltage expected value �� between this virtual communication line end node of periodE-prePercent deviation e��;
Step 5: according to the impedance percent deviation threshold value ER of settingzOr phase angle difference percent deviation threshold value ER��, select impedance percent deviation ezIt is greater than ERzDirect communication line or phase angle difference percent deviation e��It is greater than ER��Virtual communication line as problem circuit; Wherein ERz span is 20%-40%, ER��Span is 40-60%, and this implements preferred ERz is 30%, ER��It is 50%;
Step 6: for minimum connected network N, the problem circuit selected in break step 5, thus forms island or isolated PMU plant stand that namely some son connection islands only containing PMU plant stand are made up of part circuit and the node of former minimum connection networking N;
Step 7: order comprises the son connection Dao Weizhu island of maximum PMU plant stand, and get rid of the PMU plant stand that it comprises, then there is clock synchronization extremely in remaining sub-connection island and isolated PMU plant stand, isolated plant stand wherein and son are connected the PMU plant stand that Dao Zhongyuzhu island is directly connected, provide the alarm checking its clock synchronous abnormality.
Embodiments of the invention have been done detailed description and description in conjunction with Figure of description by applicant; but those skilled in the art should understand that; above embodiment is only the preferred embodiments of the invention; detailed explanation is just in order to help reader to understand spirit of the present invention better; and it is not limiting the scope of the invention; on the contrary, any any improvement of doing based on the spirit of the present invention or modify all should drop within protection scope of the present invention.

Claims (7)

1. a plant stand lockstep failure monitoring method, it is characterized in that: by phase difference of voltage between the impedance of communication line direct between calculating substation or power station or virtual communication line end node relative to the change of actual value or history value, find the lockstep failure between plant stand and power station and/or substation, and there is according to the consistence location of clock synchronization between plant stand the plant stand of lockstep failure.
2. plant stand lockstep failure monitoring method according to claim 1, it is characterised in that: described plant stand lockstep failure monitoring method specifically comprises the following steps:
Step 1: in the same electrical island of power system, all it is being provided with between each substation of phasor measurement unit PMU and each power station namely to set up a minimum connected network N, the network namely plant stand being respectively provided with PMU connected by the direct communication line of minimal number or virtual communication line between PMU plant stand;
Step 2: voltage and the electric current phasor measuring value obtaining each communication line two ends in past setting-up time section;
Step 3: calculation procedure 2 sets the phase difference of voltage �� between impedance magnitude | Z | of each direct communication line of each sampling instant in the period and virtual communication line end node, and ask for statistical expectation within this period of impedance magnitude and end node phase difference of voltage and mean value | Z |EAnd ��E;
Step 4: expected value | Z | of the computing impedance amplitude of each direct communication line tried to achieve in calculation procedure 3EWith practical impedance amplitude | Z |rPercent deviation ez, and phase difference of voltage expected value �� between virtual communication line end nodeEAnd the day before yesterday is with phase difference of voltage expected value �� between this virtual communication line end node of periodE-prePercent deviation e��;
Step 5: according to the impedance percent deviation threshold value ERz of setting or phase angle difference percent deviation threshold value ER��, select impedance percent deviation ezIt is greater than direct communication line or the phase angle difference percent deviation e of ERz��It is greater than ER��Virtual communication line as problem circuit;
Step 6: for minimum connected network N, the problem circuit selected in break step 5, thus forms some islands only contained the son connection island of PMU plant stand and be namely made up of part circuit and the node of former minimum connection networking N, or isolated PMU plant stand;
Step 7: order comprises the son connection Dao Weizhu island of maximum PMU plant stand, and get rid of the PMU plant stand that it comprises, then there is clock synchronization extremely in remaining sub-connection island and isolated PMU plant stand, to the PMU plant stand that wherein isolated PMU plant stand is directly connected with son connection Dao Zhongyuzhu island, provide the alarm checking its clock synchronous abnormality.
3. plant stand lockstep failure monitoring method according to claim 2, it is characterised in that:
In step (1), the establishment method of minimum connected network N is as follows: first selects the actual communication line between PMU plant stand and direct communication line, and selects 1; If having between the substation of PMU or power station without direct communication line, then between these two PMU plant stands, select to connect between electrically nearest node virtual communication line.
4. plant stand lockstep failure monitoring method according to Claims 2 or 3, it is characterised in that:
In step 3, for direct communication line computing impedance amplitude | Z | adopt following formula try to achieve:
| Z | = | R + j X | = | U · F 2 - U · T 2 I · F U · T - I · T U · F |
WhereinIt is respectively circuit top voltage, terminal voltage, top electric current, end current phasor;
Phase difference of voltage �� between virtual communication line end node is by virtual communication line top voltage phase angle ��UFWith virtual communication line terminal voltage phase angle ��UTDifference try to achieve:
��=��UF-��UT��
5. plant stand lockstep failure monitoring method according to claim 2 or 4, it is characterised in that:
In step 4, if without practical impedance amplitude | Z | of direct communication liner, then with expected value | Z | with the impedance magnitude of this direct communication line of period day before yesterdayE-preSubstitute.
6. plant stand lockstep failure monitoring method according to claim 2 or 4, it is characterised in that:
In steps of 5, ERzSpan be 20%-40%, ER��Span be 40-60%.
7. plant stand lockstep failure monitoring method according to claim 6, it is characterised in that:
In steps of 5, ERz is preferably 30%, ER��It is preferably 50%.
CN201511018116.9A 2015-12-30 2015-12-30 A kind of plant stand lockstep failure on-line monitoring method Active CN105629107B (en)

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CN109342887A (en) * 2018-11-22 2019-02-15 广州供电局有限公司 Distribution network failure based on phasor measuring set unifies localization method and system
CN111697689A (en) * 2020-05-13 2020-09-22 北京四方继保工程技术有限公司 Power supply equipment hidden fault monitoring method and system

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CN111697689A (en) * 2020-05-13 2020-09-22 北京四方继保工程技术有限公司 Power supply equipment hidden fault monitoring method and system

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