CN110988679A - On-site measurement method for power angle of turbonator - Google Patents
On-site measurement method for power angle of turbonator Download PDFInfo
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- CN110988679A CN110988679A CN201911171814.0A CN201911171814A CN110988679A CN 110988679 A CN110988679 A CN 110988679A CN 201911171814 A CN201911171814 A CN 201911171814A CN 110988679 A CN110988679 A CN 110988679A
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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
- G01R31/34—Testing dynamo-electric machines
- G01R31/343—Testing dynamo-electric machines in operation
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R25/00—Arrangements for measuring phase angle between a voltage and a current or between voltages or currents
Abstract
The invention discloses a field measurement method for a power angle of a turbonator, relates to the technical field of generators, and solves the problem of measurement of the power angle of the turbonator. The method comprises the following four steps, step 1, measuring and forming a recording chart by a recorder: recording the generator terminal voltage and key phase pulse with zero useful power and reactive power by a wave recorder, and forming an initial phase angle wave recording graph; after the generator is in grid-connected operation, recording generator terminal voltage and key phase pulse with active power and reactive power which are not zero by using a wave recorder, and forming an actual power angle wave recording diagram; step 2, calculating an initial phase angle: calculating an initial phase angle delta T1 by a formula delta T1= T2-T1 according to an initial phase angle oscillogram, and calculating an actual power angle in step 3: calculating an actual power angle delta T2 according to an actual power angle oscillogram by a formula delta T2= T4-T3, and calculating a power angle of the generator in step 4: the generator power angle δ is calculated from the formula δ = Δ T2- Δ T1.
Description
Technical Field
The invention relates to the technical field of generators, in particular to a field measurement method for a power angle of a steam turbine generator.
Background
The depth of the generator in the phase-entering operation is mainly determined by the static stability limit of the generator, the power angle of the generator is an important parameter for judging the static stability limit, and generally, the phase-entering operation of the generator is safe as long as the power angle of the generator is controlled within a safe range. The definition of the power angle of the generator is the included angle between the internal potential of the generator and the positive sequence phasor of the terminal voltage, the internal potential of the generator is that when the rotor of the synchronous generator rotates at a synchronous speed, a rotating magnetic field is formed in an air gap by a main magnetic field, and after the rotating magnetic field cuts a stator winding, a group of symmetrical three-phase electromotive force with the frequency f is induced in the stator winding and is called as the internal potential of the generator. The change of the power angle of the generator is monitored, and the running stable state of the generator can be effectively judged.
Disclosure of Invention
Aiming at the defects, the invention provides a field measurement method for the power angle of the steam turbine generator, which solves the problem of measurement of the power angle of the steam turbine generator.
In order to achieve the purpose, the invention adopts the following technical scheme:
a field measurement method for a power angle of a turbonator comprises the following steps of 1, measuring and forming a wave recording diagram by a wave recorder: under the condition that the active power and the reactive power of the generator are adjusted to zero after the generator operates in no-load mode or the generator operates in grid-connected mode, recording the generator terminal voltage and the key phase pulse at the moment by using a wave recorder, and forming an initial phase angle wave recording graph; under the condition that active power and reactive power on a generator after grid-connected operation are not zero, recording generator terminal voltage and key phase pulse at the moment by using a wave recorder, and forming an actual power angle wave recording graph; step 2, calculating an initial phase angle: calculating an initial phase angle delta T1 from the formula delta T1= T2-T1 according to the initial phase angle oscillogram, wherein T1 is the time point of the zero crossing point of the generator terminal voltage, and T2 is the time point of the rising segment of the key phase pulse; step 3, calculating an actual power angle: calculating an actual power angle delta T2 by a formula delta T2= T4-T3 according to an actual power angle oscillogram, wherein T3 is a time point of a zero crossing point of the generator terminal voltage, and T4 is a time point of a rising segment of the key phase pulse; step 4, calculating the power angle of the generator: the generator power angle δ is calculated from the formula δ = Δ T2- Δ T1.
Furthermore, the generator terminal voltage of the generator is taken as the secondary side, and the key phase pulse signal is taken from a turbine vibration protection cabinet of the turbine generator.
Further, the wiring is measured by the wave recorder before the power angle is measured by the wave recorder.
Compared with the prior art, the invention has the advantages that,
the method can conveniently and effectively measure the power angle of the generator, is very close to both the theoretically calculated power angle and the power angle measured by the PMU, can be used as an important parameter for judging the static stability limit of the generator, and is beneficial to ensuring the safety of the phase-in operation of the generator.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the description of the embodiments will be briefly introduced below.
FIG. 1 is a diagram of a measurement wiring according to an embodiment of the present invention;
FIG. 2 is a diagram of the initial phase angle recording of the generator according to the present invention;
fig. 3 is an actual power angle recording diagram of the generator according to the embodiment of the invention.
Detailed Description
The technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. It is to be understood that the described embodiments are merely exemplary of the invention, and not restrictive of the full scope of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The power angle of the generator is defined as an included angle between an internal potential of the generator and a positive-sequence phasor of a generator terminal voltage, the internal potential of the generator is difficult to directly measure at present, but a fixed phase relation exists between a rotor position and the internal potential of the generator, and the power angle of the generator can be measured through certain conversion because the rotor position of the generator can be directly measured.
The key phase signal is provided in the turbine protection screen cabinet of the steam turbine generator unit, and is mainly used for monitoring the vibration of a rotor shaft of a generator, and the basic principle is that a pulse signal with a certain amplitude is sent out when a rotor of the generator rotates for one circle, namely one pulse every 20ms, and the frequency of the pulse signal is the same as the generator terminal voltage frequency of the generator. Thus by measuring this signal, in combination with the generator terminal voltage, a relative phase can be measured.
According to the basic principle, the invention provides a field measurement method for the power angle of a steam turbine generator, which comprises the following steps of 1, measuring and forming a wave recording diagram by a wave recorder: under the condition that the active power and the reactive power of the generator are adjusted to zero after the generator operates in no-load mode or the generator operates in grid-connected mode, recording the generator terminal voltage and the key phase pulse at the moment by using a wave recorder, and forming an initial phase angle wave recording graph; after the generator is connected to the power grid and runs, a certain active power and reactive power are carried, the voltage at the generator end and the key phase pulse at the moment are recorded by a wave recorder, and an actual power angle wave recording graph is formed. Step 2, calculating an initial phase angle: calculating an initial phase angle delta T1 from the formula delta T1= T2-T1 according to the initial phase angle oscillogram, wherein T1 is the time point of the zero crossing point of the generator terminal voltage, and T2 is the time point of the rising segment of the key phase pulse; step 3, calculating an actual power angle: calculating an actual power angle delta T2 by a formula delta T2= T4-T3 according to an actual power angle oscillogram, wherein T3 is a time point of a zero crossing point of the generator terminal voltage, and T4 is a time point of a rising segment of the key phase pulse; step 4, calculating the power angle of the generator: the generator power angle δ is calculated from the formula δ = Δ T2- Δ T1.
The concrete measurement steps of the field embodiment of the power angle of the turbonator are as follows:
1. measuring and wiring: as shown in fig. 1, the generator terminal voltage of the generator is taken as the secondary side, and is generally 100V alternating voltage; the key phase pulse signal is taken from a turbine vibration protection cabinet of a turbine generator, has a special output end, is generally direct current pulse voltage, and has the amplitude of 1-10V;
2. measuring the initial phase angle of the generator: when the position of a rotor of a generator is directly measured by using key phase pulses, because the position of the rotor is not equal to the internal potential, under the condition that the generator operates in a no-load mode (or active power and reactive power are adjusted to 0 after the generator operates in a grid-connected mode), the terminal voltage of the generator and the key phase pulses at the moment can be recorded by a wave recorder to serve as an initial phase angle for measuring an actual power angle. As shown in fig. 2, the abscissa of the recording diagram is time, and from the recording diagram, the time T1 of the zero-crossing point u1 of the generator terminal voltage and the time T2 of the rising segment p2 of the key phase pulse are recorded, and then Δ T1= T2-T1 is calculated;
3. measuring the actual power angle of the generator: after the generator is in grid-connected operation, the generator carries certain active power and reactive power, the actual power angle of the working condition at the moment is measured, the generator terminal voltage and the key phase pulse at the moment are recorded by a wave recorder, as shown in fig. 3, the abscissa of the wave recording graph is time, the time T3 of the zero-crossing point u2 of the generator terminal voltage and the time T4 of the rising period of the key phase pulse are recorded, the delta T2= T4-T3 are calculated, and then the actual power angle of the generator at the moment can be calculated.
Therefore, the power angle delta = delta T2-delta T1 of the generator can be conveniently measured.
The power angle measured by the method is very close to both the theoretically calculated power angle and the power angle measured by the PMU, and as shown in Table 1, the power angle measured by the method is real and effective and can be applied to actual measurement.
The above description is only for the specific embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are included in the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the appended claims.
Claims (3)
1. A field measurement method for a power angle of a steam turbine generator is characterized by comprising the following steps: comprises the following steps of (a) carrying out,
step 1, measuring and forming a recording chart by a recorder: under the condition that the active power and the reactive power of the generator are adjusted to zero after the generator operates in no-load mode or the generator operates in grid-connected mode, recording the generator terminal voltage and the key phase pulse at the moment by using a wave recorder, and forming an initial phase angle wave recording graph;
under the condition that active power and reactive power on a generator after grid-connected operation are not zero, recording generator terminal voltage and key phase pulse at the moment by using a wave recorder, and forming an actual power angle wave recording graph;
step 2, calculating an initial phase angle: calculating an initial phase angle delta T1 from the formula delta T1= T2-T1 according to the initial phase angle oscillogram, wherein T1 is the time point of the zero crossing point of the generator terminal voltage, and T2 is the time point of the rising segment of the key phase pulse;
step 3, calculating an actual power angle: calculating an actual power angle delta T2 by a formula delta T2= T4-T3 according to an actual power angle oscillogram, wherein T3 is a time point of a zero crossing point of the generator terminal voltage, and T4 is a time point of a rising segment of the key phase pulse;
step 4, calculating the power angle of the generator: the generator power angle δ is calculated from the formula δ = Δ T2- Δ T1.
2. The on-site measurement method for the power angle of the steam turbine generator according to claim 1, characterized in that: the generator terminal voltage is taken as the secondary side, and the key phase pulse signal is taken from a turbine vibration protection cabinet of the turbine generator.
3. The on-site measurement method for the power angle of the steam turbine generator according to claim 1, characterized in that: the wiring is measured by the wave recorder before the power angle is measured by the wave recorder.
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| CN201911171814.0A CN110988679A (en) | 2019-11-26 | 2019-11-26 | On-site measurement method for power angle of turbonator |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4229694A (en) * | 1978-08-07 | 1980-10-21 | Wilson Gerald L | Power angle relay to measure and respond to the power angle of a synchronous generator |
| CN1786729A (en) * | 2005-11-16 | 2006-06-14 | 华东电网有限公司 | Method for directly measuring power angly and inner angle of generator |
| CN1794000A (en) * | 2005-11-23 | 2006-06-28 | 山东大学 | Monitoring device of power generator real time power angle |
| CN109962479A (en) * | 2019-03-28 | 2019-07-02 | 国网山东省电力公司电力科学研究院 | A kind of synchronous capacitor electric parameter distribution joint discrimination method based on alternating iteration optimization |
-
2019
- 2019-11-26 CN CN201911171814.0A patent/CN110988679A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4229694A (en) * | 1978-08-07 | 1980-10-21 | Wilson Gerald L | Power angle relay to measure and respond to the power angle of a synchronous generator |
| CN1786729A (en) * | 2005-11-16 | 2006-06-14 | 华东电网有限公司 | Method for directly measuring power angly and inner angle of generator |
| CN1794000A (en) * | 2005-11-23 | 2006-06-28 | 山东大学 | Monitoring device of power generator real time power angle |
| CN109962479A (en) * | 2019-03-28 | 2019-07-02 | 国网山东省电力公司电力科学研究院 | A kind of synchronous capacitor electric parameter distribution joint discrimination method based on alternating iteration optimization |
Non-Patent Citations (1)
| Title |
|---|
| 刘新军 等: "万家寨水电厂6号机进相试验", 《水电站机电技术》 * |
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