CN116955896A - Method and system for correcting synchronous reactance saturation value of generator quadrature axis - Google Patents
Method and system for correcting synchronous reactance saturation value of generator quadrature axis Download PDFInfo
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- G01R27/00—Arrangements for measuring resistance, reactance, impedance, or electric characteristics derived therefrom
- G01R27/02—Measuring real or complex resistance, reactance, impedance, or other two-pole characteristics derived therefrom, e.g. time constant
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Abstract
The invention discloses a method and a system for correcting a synchronous reactance saturation value of a generator quadrature axis, and belongs to the technical field of power systems. The method of the invention comprises the following steps: recording a first parameter value related to a generator in the unit under a certain test working condition, and taking the related first parameter value as a first recorded value; increasing the active power of the generator, recording a second parameter value related to the generator after the active power is increased, and taking the related second parameter value as a second recorded value; and carrying the first recorded value and the second recorded value into a preset equation to carry out iterative calculation so as to obtain a corrected generator quadrature axis synchronous reactance saturation value. The method has the advantages that the generator cross-axis synchronous reactance saturation values under different working conditions can be accurately obtained, and the obtained generator cross-axis synchronous reactance saturation values can be used for calculating the power angle of the generator set, so that the power angle can be evaluated as some test data of the limiting conditions.
Description
Technical Field
The invention relates to the technical field of power systems, in particular to a method and a system for correcting a saturation value of a synchronous reactance of a generator quadrature axis.
Background
In the novel power system taking the new energy as the main body, the conventional power supply gradually evolves into important components from the conventional power quantity main body power supply, and finally turns into a system regulating power supply, so that the safety, the controllability, the flexibility and the high efficiency of the novel power system are ensured.
The phase advance capability of the conventional power supply has a crucial influence on the voltage stability of the system. Therefore, the standard requires that the synchronous machine set should carry out phase advance test and set the low excitation limit fixed value after grid connection. In the phase advance test process, constraint conditions of the unit phase advance capability comprise a unit power angle, a stator voltage, a stator current, a station service voltage, a system voltage and the like. Besides the generator power angle, other quantities are convenient to measure and accurate. There are two general methods for measuring the power angle of the generator:
firstly, calculating the synchronous reactance of the active, reactive, stator voltage and the generator cross shaft of the unit;
and secondly, measuring by utilizing a key phase signal.
The first method has the disadvantages that: the size of the synchronous reactance of the generator cross shaft is directly related to the running condition of the unit due to the influence of saturation, and if a non-saturation value is used, the calculation result is larger.
The second method has the disadvantage that although the domestic generator set has key phase signals, the key phase signals need to be measured when the generator is idle to determine the zero position of the power angle. Therefore, the test unit needs to test on site for many times, and waste of manpower and material resources is caused.
Disclosure of Invention
In view of the above problems, the present invention proposes a method for correcting the saturation value of the synchronous reactance of the generator quadrature axis, comprising:
recording a first parameter value related to a generator in the unit under a certain test working condition, and taking the related first parameter value as a first recorded value;
increasing the active power of the generator, recording a second parameter value related to the generator after the active power is increased, and taking the related second parameter value as a second recorded value;
and carrying the first recorded value and the second recorded value into a preset equation to carry out iterative calculation so as to obtain a corrected generator quadrature axis synchronous reactance saturation value.
Optionally, the certain test working condition is one of the following conditions: minimum load conditions, 50% rated power, 75% rated power, and 100% rated power.
Optionally, the first parameter value includes: the known values of the active, reactive and stator voltages of the generator and the position of the key phase relative to the zero crossing of the voltage under certain test conditions.
Optionally, the second parameter value includes: the known values of the active, reactive and stator voltages of the generator after the active and the positions of the key phase relative to the zero crossing point of the voltage are increased.
Optionally, the increase in increasing the active power is a preset ratio of rated power.
Optionally, the preset equation is:
wherein δ1 is a power angle under a certain test working condition, δ2 is a power angle after adding power, Δδ is a power angle variation, P1, Q1, U1 are respectively the active, reactive and stator voltage values of the generator under a certain test working condition, P2, Q2, U2 are respectively the active, reactive and stator voltage values of the generator after adding power, xq is a corrected generator quadrature axis synchronous reactance saturation value;
wherein Δδ=Δy 360/0.02;
Δy＝y2-y1
wherein deltay is the variation of the key phase signal, y1 is the position of the key phase signal relative to the zero crossing point of the voltage under a certain test working condition, and y2 is the position of the key phase signal relative to the zero crossing point of the voltage after the active power is increased.
In yet another aspect, the present invention also provides a system for correcting a saturation value of a synchronous reactance of a generator, including:
the first recording unit is used for recording a first parameter value related to a generator in the unit under a certain test working condition, and taking the related first parameter value as a first recording value;
a second recording unit, configured to record a second parameter value related to the generator after increasing the power of the generator, and take the related second parameter value as a second recorded value;
and the iterative calculation unit is used for carrying the first recorded value and the second recorded value into a preset equation to carry out iterative calculation so as to obtain a corrected generator quadrature axis synchronous reactance saturation value.
Optionally, the certain test working condition is one of the following conditions: minimum load conditions, 50% rated power, 75% rated power, and 100% rated power.
Optionally, the first parameter value includes: the known values of the active, reactive and stator voltages of the generator and the position of the key phase relative to the zero crossing of the voltage under certain test conditions.
Optionally, the second parameter value includes: the known values of the active, reactive and stator voltages of the generator after the active and the positions of the key phase relative to the zero crossing point of the voltage are increased.
Optionally, the increase in increasing the active power is a preset ratio of rated power.
Optionally, the preset equation is:
wherein δ1 is a power angle under a certain test working condition, δ2 is a power angle after adding power, Δδ is a power angle variation, P1, Q1, U1 are respectively the active, reactive and stator voltage values of the generator under a certain test working condition, P2, Q2, U2 are respectively the active, reactive and stator voltage values of the generator after adding power, xq is a corrected generator quadrature axis synchronous reactance saturation value;
wherein Δδ=Δy 360/0.02;
Δy＝y2-y1
wherein deltay is the variation of the key phase signal, y1 is the position of the key phase signal relative to the zero crossing point of the voltage under a certain test working condition, and y2 is the position of the key phase signal relative to the zero crossing point of the voltage after the active power is increased.
In yet another aspect, the present invention also provides a computing device comprising: one or more processors;
a processor for executing one or more programs;
the method as described above is implemented when the one or more programs are executed by the one or more processors.
In yet another aspect, the present invention also provides a computer readable storage medium having stored thereon a computer program which, when executed, implements a method as described above.
Compared with the prior art, the invention has the beneficial effects that:
the invention provides a method for correcting a synchronous reactance saturation value of a generator quadrature axis, which comprises the following steps: recording a first parameter value related to a generator in the unit under a certain test working condition, and taking the related first parameter value as a first recorded value; increasing the active power of the generator, recording a second parameter value related to the generator after the active power is increased, and taking the related second parameter value as a second recorded value; and carrying the first recorded value and the second recorded value into a preset equation to carry out iterative calculation so as to obtain a corrected generator quadrature axis synchronous reactance saturation value. The method has the advantages that the generator cross-axis synchronous reactance saturation values under different working conditions can be accurately obtained, and the obtained generator cross-axis synchronous reactance saturation values can be used for calculating the power angle of the generator set, so that the power angle can be evaluated as some test data of the limiting conditions.
Drawings
FIG. 1 is a flow chart of the method of the present invention;
fig. 2 is a block diagram of the system of the present invention.
Detailed Description
The exemplary embodiments of the present invention will now be described with reference to the accompanying drawings, however, the present invention may be embodied in many different forms and is not limited to the examples described herein, which are provided to fully and completely disclose the present invention and fully convey the scope of the invention to those skilled in the art. The terminology used in the exemplary embodiments illustrated in the accompanying drawings is not intended to be limiting of the invention. In the drawings, like elements/components are referred to by like reference numerals.
Unless otherwise indicated, terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art. In addition, it will be understood that terms defined in commonly used dictionaries should be interpreted as having a meaning that is consistent with their meaning in the context of the relevant art and will not be interpreted in an idealized or overly formal sense.
Example 1:
the invention provides a method for correcting the saturation value of synchronous reactance of a generator quadrature axis, which is shown in figure 1 and comprises the following steps:
step 1, recording a first parameter value related to a generator in a unit under a certain test working condition, and taking the related first parameter value as a first recorded value;
step 2, increasing the active power of the generator, recording a second parameter value related to the generator after the active power is increased, and taking the related second parameter value as a second recorded value;
and step 3, carrying the first recorded value and the second recorded value into a preset equation to perform iterative calculation so as to obtain a corrected generator cross-axis synchronous reactance saturation value.
Wherein, a certain test working condition is one of the following: minimum load conditions, 50% rated power, 75% rated power, and 100% rated power.
Wherein the first parameter value comprises: the known values of the active, reactive and stator voltages of the generator and the position of the key phase relative to the zero crossing of the voltage under certain test conditions.
Wherein the second parameter value comprises: the known values of the active, reactive and stator voltages of the generator after the active and the positions of the key phase relative to the zero crossing point of the voltage are increased.
Wherein, the increment of the increment active power is rated power of a preset proportion.
Wherein, the preset equation is:
wherein δ1 is a power angle under a certain test working condition, δ2 is a power angle after adding power, Δδ is a power angle variation, P1, Q1, U1 are respectively the active, reactive and stator voltage values of the generator under a certain test working condition, P2, Q2, U2 are respectively the active, reactive and stator voltage values of the generator after adding power, xq is a corrected generator quadrature axis synchronous reactance saturation value;
wherein Δδ=Δy 360/0.02;
Δy＝y2-y1
wherein deltay is the variation of the key phase signal, y1 is the position of the key phase signal relative to the zero crossing point of the voltage under a certain test working condition, and y2 is the position of the key phase signal relative to the zero crossing point of the voltage after the active power is increased.
The invention is further illustrated by the following examples:
and under a certain test working condition (usually a minimum load working condition, 50% Pn, 75% Pn and 100Pn, pn are rated power), if the active, reactive and stator voltage nominal values of the generator are P1, Q1 and U1 respectively, and the position of the phase-key relative voltage zero crossing point is recorded as y1. And (3) increasing the active power of the generator by 2%Pn, recording the active power, reactive power and stator voltages at the moment as P2, Q2 and U2 respectively, and recording the position of the phase key relative to the zero crossing point of the voltage as y2.
The change amount delta y=y2-y 1 of the key phase signal causes the change amount delta delta=deltay to be 360/0.02 of the power angle caused by the work. Under the working condition, the saturation characteristic of the synchronous reactance of the generator cross shaft can be considered unchanged due to small active variable quantity. Assuming that the quadrature axis synchronous reactance is Xq under the working condition, the power angles under the initial condition can be obtained respectively by using a power angle calculation formula as follows:
the power angle after power adjustment is as follows:
then:
and substituting the recorded values into the equation, solving Xq through an iterative method, wherein the value can be regarded as a quadrature axis synchronous reactance saturation value under the working condition. The power angle calculation may take this value during the phase advance of the condition.
When the phase advance test under other working conditions is carried out, the Xq value can be obtained again by repeating the above process.
Example 2:
the invention also proposes a system 200 for correcting the saturation value of the synchronous reactance of the generator's quadrature axis, as shown in fig. 2, comprising:
the first recording unit 201 is configured to record a first parameter value related to a generator in the unit when the unit is under a certain test working condition, and take the related first parameter value as a first recorded value;
a second recording unit 202, configured to record a second parameter value related to the generator after increasing the power of the generator, and take the related second parameter value as a second recorded value;
and the iterative calculation unit 203 is configured to bring the first recorded value and the second recorded value into a preset equation to perform iterative calculation, so as to obtain a corrected generator quadrature axis synchronous reactance saturation value.
Wherein, a certain test working condition is one of the following: minimum load conditions, 50% rated power, 75% rated power, and 100% rated power.
Wherein the first parameter value comprises: the known values of the active, reactive and stator voltages of the generator and the position of the key phase relative to the zero crossing of the voltage under certain test conditions.
Wherein the second parameter value comprises: the known values of the active, reactive and stator voltages of the generator after the active and the positions of the key phase relative to the zero crossing point of the voltage are increased.
Wherein, the increment of the increment active power is rated power of a preset proportion.
Wherein, the preset equation is:
wherein δ1 is a power angle under a certain test working condition, δ2 is a power angle after adding power, Δδ is a power angle variation, P1, Q1, U1 are respectively the active, reactive and stator voltage values of the generator under a certain test working condition, P2, Q2, U2 are respectively the active, reactive and stator voltage values of the generator after adding power, xq is a corrected generator quadrature axis synchronous reactance saturation value;
wherein Δδ=Δy 360/0.02;
Δy＝y2-y1
wherein deltay is the variation of the key phase signal, y1 is the position of the key phase signal relative to the zero crossing point of the voltage under a certain test working condition, and y2 is the position of the key phase signal relative to the zero crossing point of the voltage after the active power is increased.
The method has the advantages that the generator cross-axis synchronous reactance saturation values under different working conditions can be accurately obtained, and the obtained generator cross-axis synchronous reactance saturation values can be used for calculating the power angle of the generator set, so that the power angle can be evaluated as some test data of the limiting conditions.
Example 3:
based on the same inventive concept, the invention also provides a computer device comprising a processor and a memory for storing a computer program comprising program instructions, the processor for executing the program instructions stored by the computer storage medium. The processor may be a central processing unit (Central Processing Unit, CPU), but may also be other general purpose processors, digital signal processors (Digital Signal Processor, DSP), application specific integrated circuits (Application SpecificIntegrated Circuit, ASIC), off-the-shelf Programmable gate arrays (FPGAs) or other Programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc., which are the computational core and control core of the terminal adapted to implement one or more instructions, in particular adapted to load and execute one or more instructions within a computer storage medium to implement the corresponding method flow or corresponding functions to implement the steps of the method in the embodiments described above.
Example 4:
based on the same inventive concept, the present invention also provides a storage medium, in particular, a computer readable storage medium (Memory), which is a Memory device in a computer device, for storing programs and data. It is understood that the computer readable storage medium herein may include both built-in storage media in a computer device and extended storage media supported by the computer device. The computer-readable storage medium provides a storage space storing an operating system of the terminal. Also stored in the memory space are one or more instructions, which may be one or more computer programs (including program code), adapted to be loaded and executed by the processor. The computer readable storage medium herein may be a high-speed RAM memory or a non-volatile memory (non-volatile memory), such as at least one magnetic disk memory. One or more instructions stored in a computer-readable storage medium may be loaded and executed by a processor to implement the steps of the methods in the above-described embodiments.
It will be appreciated by those skilled in the art that embodiments of the present invention may be provided as a method, system, or computer program product. Accordingly, the present invention may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present invention may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein. The scheme in the embodiment of the invention can be realized by adopting various computer languages, such as object-oriented programming language Java, an transliteration script language JavaScript and the like.
The present invention is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems) and computer program products according to embodiments of the invention. It will be understood that each flow and/or block of the flowchart illustrations and/or block diagrams, and combinations of flows and/or blocks in the flowchart illustrations and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
While preferred embodiments of the present invention have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. It is therefore intended that the following claims be interpreted as including the preferred embodiments and all such alterations and modifications as fall within the scope of the invention.
It will be apparent to those skilled in the art that various modifications and variations can be made to the present invention without departing from the spirit or scope of the invention. Thus, it is intended that the present invention also include such modifications and alterations insofar as they come within the scope of the appended claims or the equivalents thereof.
Claims (14)
1. A method for correcting generator cross-axis synchronous reactance saturation values, the method comprising:
recording a first parameter value related to a generator in the unit under a certain test working condition, and taking the related first parameter value as a first recorded value;
increasing the active power of the generator, recording a second parameter value related to the generator after the active power is increased, and taking the related second parameter value as a second recorded value;
and carrying the first recorded value and the second recorded value into a preset equation to carry out iterative calculation so as to obtain a corrected generator quadrature axis synchronous reactance saturation value.
2. The method of claim 1, wherein the test condition is one of: minimum load conditions, 50% rated power, 75% rated power, and 100% rated power.
3. The method of claim 1, wherein the first parameter value comprises: the known values of the active, reactive and stator voltages of the generator and the position of the key phase relative to the zero crossing of the voltage under certain test conditions.
4. The method of claim 1, wherein the second parameter value comprises: the known values of the active, reactive and stator voltages of the generator after the active and the positions of the key phase relative to the zero crossing point of the voltage are increased.
5. The method of claim 1, wherein the increase in incremental power is a predetermined proportion of rated power.
6. The method of claim 1, wherein the predetermined equation is:
wherein δ1 is a power angle under a certain test working condition, δ2 is a power angle after adding power, Δδ is a power angle variation, P1, Q1, U1 are respectively the active, reactive and stator voltage values of the generator under a certain test working condition, P2, Q2, U2 are respectively the active, reactive and stator voltage values of the generator after adding power, xq is a corrected generator quadrature axis synchronous reactance saturation value;
wherein Δδ=Δy 360/0.02;
Δy＝y2-y1
wherein deltay is the variation of the key phase signal, y1 is the position of the key phase signal relative to the zero crossing point of the voltage under a certain test working condition, and y2 is the position of the key phase signal relative to the zero crossing point of the voltage after the active power is increased.
7. A system for correcting generator cross-axis synchronous reactance saturation values, the system comprising:
the first recording unit is used for recording a first parameter value related to a generator in the unit under a certain test working condition, and taking the related first parameter value as a first recording value;
a second recording unit, configured to record a second parameter value related to the generator after increasing the power of the generator, and take the related second parameter value as a second recorded value;
and the iterative calculation unit is used for carrying the first recorded value and the second recorded value into a preset equation to carry out iterative calculation so as to obtain a corrected generator quadrature axis synchronous reactance saturation value.
8. The system of claim 7, wherein the test condition is one of: minimum load conditions, 50% rated power, 75% rated power, and 100% rated power.
9. The system of claim 7, wherein the first parameter value comprises: the known values of the active, reactive and stator voltages of the generator and the position of the key phase relative to the zero crossing of the voltage under certain test conditions.
10. The system of claim 7, wherein the second parameter value comprises: the known values of the active, reactive and stator voltages of the generator after the active and the positions of the key phase relative to the zero crossing point of the voltage are increased.
11. The system of claim 7, wherein the increase in incremental power is a predetermined proportion of rated power.
12. The system of claim 7, wherein the predetermined equation is:
wherein δ1 is a power angle under a certain test working condition, δ2 is a power angle after adding power, Δδ is a power angle variation, P1, Q1, U1 are respectively the active, reactive and stator voltage values of the generator under a certain test working condition, P2, Q2, U2 are respectively the active, reactive and stator voltage values of the generator after adding power, xq is a corrected generator quadrature axis synchronous reactance saturation value;
wherein Δδ=Δy 360/0.02;
Δy＝y2-y1
wherein deltay is the variation of the key phase signal, y1 is the position of the key phase signal relative to the zero crossing point of the voltage under a certain test working condition, and y2 is the position of the key phase signal relative to the zero crossing point of the voltage after the active power is increased.
13. A computer device, comprising:
one or more processors;
a processor for executing one or more programs;
the method of any of claims 1-6 is implemented when the one or more programs are executed by the one or more processors.
14. A computer readable storage medium, characterized in that a computer program is stored thereon, which computer program, when executed, implements the method according to any of claims 1-6.
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