CN106599362B - Automatic checking method for rationality of generator parameters - Google Patents
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Abstract
The invention provides a method for automatically checking the rationality of generator parameters, which comprises the following steps: I. automatically reading in a generator model and parameters, and automatically identifying the type of the generator; II. Converting generator parameters according to the rated capacity and the reference capacity of the generator; III, comparing and analyzing the generator parameters converted to rated capacity with a reasonable range, and grading the rationality of the generator parameters; and IV, alarming the generator with unreasonable parameters, and giving a suggested numerical range of the generator parameters under the corresponding reference capacity. The automatic checking method for the rationality of the generator parameters is easy to realize, can rapidly screen out unreasonable generator parameters, and can give out reasonable parameter ranges according to the types of the generators.
Description
Technical Field
The invention relates to a method in the technical field of large power grid online simulation and calculation analysis, in particular to an automatic checking method for generator parameter rationality.
Background
Because of the specificity of the safe operation of the power grid, it is difficult to check the dynamic performance of the main equipment by applying various disturbance tests, so that the most effective method for knowing the dynamic characteristics of the power grid is through dynamic simulation. Dynamic simulation is widely applied to the departments of power system design, operation and the like at present. The simulation results are used not only to guide the operating department to schedule production, but also to set parameters of various control devices. Dynamic simulation therefore plays a vital role in the power system.
Since the simulation is only an approximate simulation of the real system, the simulation cannot be completely consistent with the real system, and the calculation result of the simulation necessarily has the problem of whether the reliability and the degree of reliability are great. Dynamic simulation of the power system starts in the 60 th century of the 20 th century, but the problem of reliability is not paid attention to, on the one hand, the staff of the power system are more important to adopting a conservative model in simulation calculation subjectively, and the running mode is formulated by utilizing a conservative calculation result so as to fully ensure the safety of the system; on the other hand, there is objectively no means for evaluating the reliability. The conservative result is used for guiding production, so that on one hand, the economical efficiency of system operation is reduced; on the other hand, the power grid becomes huge and complex due to the interconnection of the power grid and the operation of various stable control devices, and a conservative simulation model cannot ensure that the simulation results are conservative under all disturbance conditions, so that potential safety hazards are buried in the system.
The simulation analysis of the power system is carried out aiming at simulated power system equipment, and main factors influencing the reliability of simulation analysis results are equipment models, equipment parameters and analysis algorithms. The power system equipment model and parameters are basic, and the credibility of the simulation result of the power system can be guaranteed only by guaranteeing the effectiveness of all the models and parameters. The generator is very important power equipment in the power system, and whether the model and parameters of the generator are accurate or not has obvious influence on static stability, dynamic stability and transient stability of the power system. For the same generator model, different set parameters bring about distinct simulation analysis results. In the planning stage, the typical parameters of the generator are generally used for conversion as input data for simulation; after the equipment is switched on, parameter tests are usually carried out on the generator and a control system thereof, and the test results are converted and then used as input data for simulation. However, errors are inevitably generated in the testing and converting processes, the errors are generally submerged in a large amount of simulation data, the problems can only be searched for by a large amount of manpower in a time consuming manner when the simulation results are problematic, and at present, no method for automatically checking the rationality of the parameters of the generator exists, so that the data problems are found out and corrected in time before simulation analysis, and the reliability of the simulation analysis results is prevented from being influenced due to the parameter problems.
Disclosure of Invention
In order to solve the defects in the prior art, the invention aims to provide an automatic checking method for rationality of generator parameters, which is used for automatically checking the problem of unreasonable generator parameters in simulation analysis data, solving the problem of reversely searching the generator parameters only through abnormal simulation analysis results, realizing active discovery of the generator parameters, correcting the generator parameters in time and avoiding influencing the reliability of the simulation analysis results due to the parameter problems.
The invention aims at adopting the following technical scheme:
the invention provides an automatic checking method for the rationality of generator parameters, which is characterized by comprising the following steps:
I. automatically reading in a generator model and parameters, and automatically identifying the type of the generator;
II. According to the rated capacity S of the generator N And a reference capacity S B Converting parameters of the generator;
III, comparing and analyzing parameters of the generator converted to rated capacity with a reasonable range, and grading the rationality of the parameters of the generator;
IV, alarming the generator with unreasonable parameters and giving a corresponding reference capacity S B The following suggested numerical ranges for generator parameters.
Further, in the step I, a generator parameter rationality automatic checking program automatically reads in a generator model and parameters, and supports a power system analysis comprehensive program and a data file of the generator model and the generator parameters in a PSD-BPA format; the generator model comprises a thermal power model, a hydroelectric model, a wind power model and a photovoltaic model.
Generator parameters including rated capacity S N Reference capacity S B Synchronous reactance, transient reactance, sub-transient reactance, and inertial time constant.
Further, the synchronous reactance comprises a d-axis synchronous reactance X dB Q-axis synchronous reactance X qB The transient reactance includes d-axis transient reactance X' dB And q-axis transient reactance X' qB The sub-transient reactance includes d-axis sub-transient reactance X dB And q-axis secondary transient reactance X qB The inertia time constant is T jB 。
Further, in the step II, the generator rated capacity S N Refers to the rated capacity value marked on the nameplate of the generator and the reference capacity S B Means converting generator parameters to uniform capacity for ease of calculation;
the relation between the generator parameter and the reference capacity is as follows: synchronous reactance, transient reactance, sub-transient reactance and reference capacity S B Proportional to the inertia time constant T jB And reference capacity S B Inversely proportional.
Further, according to the power generationRated capacity S of machine N And a reference capacity S B Converting the generator parameters includes:
d-axis synchronous reactance X dB Q-axis synchronous reactance X qB And reference capacity S B And rated capacity S N The relationships of (2) are shown in the following formulas (1) and (2), respectively:
X dN ＝X dB *S N /S B (1)
X qN ＝X qB *S N /S B (2)
d-axis transient reactance X' dB And q-axis transient reactance X' qB And reference capacity S B And rated capacity S N The relationships of (3) and (4) are shown in the following formulas:
X' dN ＝X' dB *S N /S B (3)
X' qN ＝X' qB *S N /S B (4)
d-axis secondary transient reactance X dB And q-axis secondary transient reactance X qB And reference capacity S B And rated capacity S N The relationships of (2) are shown in the formulas (5) and (6), respectively:
X″ dN ＝X″ dB *S N /S B (5)
X″ qN ＝X″ qB *S N /S B (6)
inertial time constant and reference volume S B And rated capacity S N The relation of (2) is shown in the formula (7):
T jN ＝T jB *S B /S N (7)
wherein: x is X dN 、X qN 、X' dN 、X' qN 、X″ dN 、X″ qN 、T jN The synchronous reactance is d-axis synchronous reactance, q-axis synchronous reactance, d-axis transient reactance, q-axis transient reactance, d-axis secondary transient reactance, q-axis secondary transient reactance and inertia time constant under the corresponding rated capacity.
Further, the step III includes:
grading the rationality of the generator parameters means that 4 grades are defined according to the deviation degree of the generator parameters and the upper limit and the lower limit, wherein the grades are normal, slightly out of limit, seriously out of limit and deadly out of limit respectively; k is the out-of-limit ratio of the parameters of the generator, and the formula (8) is as follows:
k=abs (generator parameter-generator limit)/generator parameter (8)
1) Normal out-of-limit refers to generator parameters being within a reasonable range;
2) Slight out-of-limit means that the generator parameters exceed the limits and k <0.25;
3) The serious out-of-limit means that the generator parameter exceeds the limit value, and k is more than or equal to 0.25 and less than or equal to 1;
4) The deadly out-of-limit means that the generator parameter exceeds the limit value and k is more than or equal to 1.
Further, in the step IV, the warning of the generator with unreasonable generator parameters means that the generator parameters under the three conditions of slight out-of-limit, serious out-of-limit and deadly out-of-limit are output, and the generator parameters are given to correspond to the reference capacity S B Reasonable ranges below.
Further, the reasonable range of the generator parameters is the reasonable range of the generator parameters listed in technical requirements of GB_T_7064-2008 non-salient pole synchronous generators, IEEE guide: test Procedures for Synchronous Machines and Power System Stability and Control.
The following presents a simplified summary in order to provide a basic understanding of some aspects of the disclosed embodiments. This summary is not an extensive overview and is intended to neither identify key/critical elements nor delineate the scope of such embodiments. Its sole purpose is to present some concepts in a simplified form as a prelude to the more detailed description that is presented later.
Compared with the closest prior art, the technical scheme provided by the invention has the following excellent effects:
1. the method for automatically checking the rationality of the generator parameters can automatically read the data files of the generator models and parameters in PSASP and PSD-BPA formats and automatically identify the generator types.
2. The method provided by the invention converts the parameters of the generator into the rated capacity through the relation between the parameters and the rated capacity, and the parameters are conveniently compared with the reasonable range of the parameters.
3. In the method provided by the invention, the quantitative index of parameter abnormality is defined, and the alarm level is formulated according to the abnormality condition.
4. The method provided by the invention is realized automatically in the whole checking process, improves the working efficiency of parameter checking, gives out the effective range of the parameter and is beneficial to parameter correction.
To the accomplishment of the foregoing and related ends, the one or more embodiments comprise the features hereinafter fully described and particularly pointed out in the claims. The following description and the annexed drawings set forth in detail certain illustrative aspects and are indicative of but a few of the various ways in which the principles of the various embodiments may be employed. Other benefits and novel features will become apparent from the following detailed description when considered in conjunction with the drawings, the disclosed embodiments are intended to include all such aspects and their equivalents.
Drawings
Fig. 1 is a flowchart of a method for automatically checking the rationality of generator parameters.
Detailed Description
The following describes the embodiments of the present invention in further detail with reference to the drawings.
The following description and the drawings sufficiently illustrate specific embodiments of the invention to enable those skilled in the art to practice them. Other embodiments may involve structural, logical, electrical, process, and other changes. The embodiments represent only possible variations. Individual components and functions are optional unless explicitly required, and the sequence of operations may vary. Portions and features of some embodiments may be included in, or substituted for, those of others. The scope of embodiments of the invention encompasses the full ambit of the claims, as well as all available equivalents of the claims. These embodiments of the invention may be referred to herein, individually or collectively, by the term "invention" merely for convenience and without intending to voluntarily limit the scope of this application to any single invention or inventive concept if more than one is in fact disclosed.
As shown in fig. 1, fig. 1 is a flowchart of a method for automatically checking the rationality of generator parameters in the present embodiment; the automatic checking method for the rationality of the parameters of the generator comprises the following steps:
I. automatically reading in a generator model and parameters, and automatically identifying the type of the generator:
specific: in step I, the program automatically reads in the generator model and parameters, and supports the data files of the generator model and parameters in the Power System Analysis and Synthesis Program (PSASP) and PSD-BPA formats.
And the type of the generator is automatically identified, and the generator comprises a fire motor, a water motor, a wind motor and a photovoltaic.
Parameters of the generator including rated capacity, reference capacity, synchronous reactance, transient reactance, sub-transient reactance and inertia time constant are automatically read.
The generator parameters include: synchronous reactance, transient reactance, sub-transient reactance, and inertial time constant. Specifically, the synchronous reactance is divided into a d-axis synchronous reactance and a q-axis synchronous reactance, the transient reactance is divided into a d-axis transient reactance and a q-axis transient reactance, and the sub-transient reactance is divided into a d-axis sub-transient reactance and a q-axis sub-transient reactance.
In the step 1, the d-axis synchronous reactance X with the parameters of the generator corresponding to the reference capacity is automatically read dB Q-axis synchronous reactance X qB The transient reactance is divided into d-axis transient reactance X' dB And q-axis transient reactance X' qB The sub-transient reactance is divided into d-axis sub-transient reactance X dB And q-axis secondary transient reactance X qB Inertial time constant T jB 。
II. Converting generator parameters according to the rated capacity and the reference capacity of the generator:
specific: in the step II, the rated capacity of the generator refers to the rated capacity value marked on the name plate of the generator, and the reference capacity refers to the conversion of generator parameters to uniform capacity for the convenience of calculation;
generating electricityA reasonable range of machine parameters is a value at the corresponding rated capacity, so the generator parameters for the reference capacity need to be converted to parameters for the rated capacity. The d-axis synchronous reactance, the q-axis synchronous reactance, the d-axis transient reactance, the q-axis transient reactance, the d-axis secondary transient reactance, the q-axis secondary transient reactance and the inertia time constant corresponding to rated capacity are respectively used with X dN 、X qN 、X' dN 、X' qN 、X″ dN 、X″ qN And T jN And (3) representing.
d-axis synchronous reactance and q-axis synchronous reactance and reference capacity S B And rated capacity S N The relation of (2) is shown in the following formulas (1) and (2):
X dN ＝X dB *S N /S B (1)
X qN ＝X qB *S N /S B (2)
d-axis transient reactance and q-axis transient reactance and reference capacity S B And rated capacity S N The relation of (2) is shown in the formulas (3) and (4):
X' dN ＝X' dB *S N /S B (3)
X' qN ＝X' qB *S N /S B (4)
d-axis sub-transient reactance and q-axis sub-transient reactance and reference capacity S B And rated capacity S N The relationship of (2) is shown in the formulas (5) and (6):
X″ dN ＝X″ dB *S N /S B (5)
X″ qN ＝X″ qB *S N /S B (6)
inertial time constant and reference volume S B And rated capacity S N The relation of (2) is shown in the formula (7):
T jN ＝T jB *S B /S N (7)
and III, comparing and analyzing the generator parameters converted to rated capacity with a reasonable range, and grading the rationality of the generator parameters:
specific: in step III, comparing and analyzing the generator parameters converted to rated capacity with a reasonable range, where the reasonable range of generator parameters corresponding to rated capacity includes synchronous reactance, transient reactance, sub-transient reactance and inertia time constant of the fire motor and the water motor, as shown in table 1:
TABLE 1 synchronous reactance, transient reactance, sub-transient reactance and inertial time constant table for fire and water motors
| Parameter name | Water motor | Fire motor |
| x d | 0.6-1.5 | 1.0-2.3 |
| x q | 0.4-1.0 | 1.0-2.3 |
| x′ d | 0.2-0.5 | 0.15-0.4 |
| x′ q | Without any means for | 0.3-1.0 |
| x″ d | 0.15-0.35 | 0.12-0.25 |
| x″ q | 0.2-0.45 | 0.12-0.25 |
| T j | 4.0-8.0 | 8.0-20.0 |
The rationality of the generator parameters is classified into 4 classes, namely normal, slightly out-of-limit, severely out-of-limit and deadly out-of-limit according to the deviation degree of the generator parameters from the upper limit and the lower limit. k is the out-of-limit ratio of the parameters of the generator, and is shown in the formula (8):
k=abs (generator parameter-generator limit)/generator parameter (8)
1) Normal means that the generator parameters are within a reasonable range;
2) Slight out-of-limit means that the generator parameters exceed the limits and k <0.25;
3) The serious out-of-limit means that the generator parameter exceeds the limit value, and k is more than or equal to 0.25 and less than or equal to 1;
4) The deadly out-of-limit means that the generator parameter exceeds the limit value and k is more than or equal to 1.
IV, alarming the generator with unreasonable parameters, and giving a suggested numerical range of the generator parameters under the corresponding reference capacity:
specific: in the step IV, the alarming of the generator with unreasonable parameters means that the generator parameters under the three conditions of slight out-of-limit, serious out-of-limit and deadly out-of-limit exist in output, and the reasonable range of the generator parameters under the reference capacity is given.
Examples:
taking an HJA2 hydroelectric generating set of a hydropower plant as an example, the reference capacity of the generating set is 100MVA, the rated capacity of the generating set is 50MVA, and the generating set corresponds to the reference capacity and each parameter converted to the rated capacity is shown in table 2:
table 2 synchronous reactance, transient reactance, sub-transient reactance and inertia at corresponding reference and rated capacities of HJA2 units
Table 2 time constant table
| Parameter name | Reference capacity | Rated capacity |
| x d | 2.4277 | 1.21385 |
| x q | 1.60439 | 0.802195 |
| x′ d | 0.6333 | 0.31665 |
| x′ q | Without any means for | Without any means for |
| x″ d | 0.4431 | 0.22155 |
| x″ q | 0.48553 | 0.242765 |
| T j | 1.0 | 2.0 |
As can be seen from comparison of table 2 and table 1, the synchronous reactance, the transient reactance and the sub-transient reactance of the unit are all in a reasonable range under the rated capacity, but the inertia time constant of the unit under the rated capacity is far smaller than the lower limit, the parameter out-of-limit proportion k=1 is deadly out-of-limit, the reasonable range is 4.0-8.0, and the transient function instability problem can occur when the line near the hydropower plant fails due to abnormal parameters.
The inspection program realized based on the method can automatically inspect abnormal conditions of synchronous reactance, transient reactance, sub-transient reactance and inertia time constant of the generator, saves a large number of manual inspection parameters, and can greatly improve the working efficiency.
The above embodiments are only for illustrating the technical solution of the present invention and not for limiting the same, and although the present invention has been described in detail with reference to the above embodiments, one skilled in the art may make modifications and equivalents to the specific embodiments of the present invention, and any modifications and equivalents not departing from the spirit and scope of the present invention are within the scope of the claims of the present invention.
Claims (6)
1. An automatic checking method for the rationality of generator parameters, which is characterized by comprising the following steps:
I. automatically reading in a generator model and parameters, and automatically identifying the type of the generator;
II. According to the rated capacity S of the generator N And a reference capacity S B Converting parameters of the generator;
III, comparing and analyzing parameters of the generator converted to rated capacity with a reasonable range, and grading the rationality of the parameters of the generator;
the reasonable range of the generator parameters is listed in technical requirements of GB_T_7064-2008 non-salient pole synchronous generators and IEEE guide: test Procedures for Synchronous Machines;
IV, alarming the generator with unreasonable parameters and giving a corresponding reference capacity S B A recommended numerical range for the generator parameters;
according to the rated capacity S of the generator N And a reference capacity S B Converting the generator parameters includes:
d-axis synchronous reactance X dB Q-axis synchronous reactance X qB And reference capacity S B And rated capacity S N The relationships of (2) are shown in the following formulas (1) and (2), respectively:
X dN ＝X dB *S N /S B (1)
X qN ＝X qB *S N /S B (2)
d-axis transient reactance X' dB And q-axis transient reactance X' qB And reference capacity S B And rated capacity S N The relationships of (3) and (4) are shown in the following formulas:
X' dN ＝X' dB *S N /S B (3)
X' qN ＝X' qB *S N /S B (4)
d-axis sub-transient reactance X' d ' B And q-axis sub-transient reactance X' q ' B And reference capacity S B And rated capacity S N The relationships of (2) are shown in the formulas (5) and (6), respectively:
X' d ' N ＝X' d ' B *S N /S B (5)
X' q ' N ＝X' q ' B *S N /S B (6)
inertial time constant and reference volume S B And rated capacity S N The relation of (2) is shown in the formula (7):
T jN ＝T jB *S B /S N (7)
wherein: x is X dN 、X qN 、X' dN 、X' qN 、X' d ' N 、X' q ' N 、T jN The synchronous reactance is d-axis synchronous reactance, q-axis synchronous reactance, d-axis transient reactance, q-axis transient reactance, d-axis secondary transient reactance, q-axis secondary transient reactance and inertia time constant under the corresponding rated capacity.
2. The automatic checking method for the rationality of generator parameters according to claim 1, wherein in the step I, the automatic checking program for the rationality of generator parameters automatically reads in the generator model and parameters, and supports the analysis of the data files of the generator model and the generator parameters in the integrated program PSASP and PSD-BPA format of the electric power system; the generator model comprises a thermal power model, a hydroelectric model, a wind power model and a photovoltaic model;
generator parameters including rated capacity S N Reference capacity S B Synchronous reactance, transient reactance, sub-transient reactance, and inertial time constant.
3. The automatic checking method for rationality of generator parameters according to claim 2, wherein said synchronous reactance comprises a d-axis synchronous reactance X dB Q-axis synchronous reactance X qB The transient reactance includes d-axis transient reactance X' dB And q-axis transient reactance X' qB The sub-transient reactance includes d-axis sub-transient reactance X' d ' B And q-axis sub-transient reactance X' q ' B The inertia time constant is T jB 。
4. The automatic checking method for the rationality of generator parameters according to claim 1, wherein in said step II, said generator rated capacity S N Refers to the rated capacity value marked on the nameplate of the generator and the reference capacity S B Means converting generator parameters to uniform capacity for ease of calculation;
the relation between the generator parameter and the reference capacity is as follows: synchronous reactance, transient reactance, sub-transient reactance and reference capacity S B Proportional to the inertia time constant T jB And reference volumeQuantity S B Inversely proportional.
5. The automatic checking method for rationality of generator parameters according to claim 1, wherein said step III comprises:
grading the rationality of the generator parameters means that 4 grades are defined according to the deviation degree of the generator parameters and the upper limit and the lower limit, wherein the grades are normal, slightly out of limit, seriously out of limit and deadly out of limit respectively; k is the out-of-limit ratio of the parameters of the generator, and the formula (8) is as follows:
k=abs (generator parameter-generator limit)/generator parameter (8)
1) Normal out-of-limit refers to generator parameters being within a reasonable range;
2) Slight out-of-limit means that the generator parameters exceed the limits and k <0.25;
3) The serious out-of-limit means that the generator parameter exceeds the limit value, and k is more than or equal to 0.25 and less than or equal to 1;
4) The deadly out-of-limit means that the generator parameter exceeds the limit value and k is more than or equal to 1.
6. The automatic checking method for rationality of generator parameters according to claim 1, wherein in the step IV, the warning of the generator with unreasonable generator parameters means that the generator parameters in three cases of slight out-of-limit, serious out-of-limit and deadly out-of-limit are outputted, and the generator parameters are given to correspond to the reference capacity S B Reasonable ranges below.
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