CN107228998B - Parameter identification-based automatic tracking method for running capacity of magnetic control type parallel reactor - Google Patents
Parameter identification-based automatic tracking method for running capacity of magnetic control type parallel reactor Download PDFInfo
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- CN107228998B CN107228998B CN201710656476.4A CN201710656476A CN107228998B CN 107228998 B CN107228998 B CN 107228998B CN 201710656476 A CN201710656476 A CN 201710656476A CN 107228998 B CN107228998 B CN 107228998B
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- G—PHYSICS
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- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
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- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R27/00—Arrangements for measuring resistance, reactance, impedance, or electric characteristics derived therefrom
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Abstract
The invention discloses a magnetic control type parallel reactor running capacity automatic tracking method based on parameter identification, which comprises the steps of identifying reactor impedance parameters, analyzing and confirming the capacity change of a reactor, calculating the real-time reactor running capacity, using a protection starting element as a correction algorithm locking element when the capacity change of the reactor exceeds a certain threshold value, and correcting a protection constant value only when the reactor runs stably when protection is not started. The invention can ensure the protection sensitivity in real time, avoid the occurrence of the false operation of the reactor protection failure caused by the change of the working condition of the reactor, and ensure the protection sensitivity and reliability.
Description
Technical Field
The invention relates to a magnetic control type parallel reactor operation capacity automatic tracking method based on parameter identification, and belongs to the technical field of reactor protection.
background
The shunt reactor has the functions of limiting overvoltage and reactive compensation, the shunt reactor comprises a fixed capacity reactor, a graded controllable reactor and a magnetic control shunt reactor, the capacity of the fixed capacity reactor is not adjustable, the graded controllable reactor can not continuously adjust the capacity although the capacity is adjustable, the magnetic control shunt reactor can make up the defects of the fixed capacity reactor, the capacity can be continuously adjusted, the capacity can be adjusted from 5 percent to 100 percent, and the shunt reactor is widely used in an extra-high voltage system, so the shunt reactor is important in stable operation and has higher requirements on the reliability of protection, but the backup protection fixed values of differential protection, overcurrent and the like which are currently used as main protection of the reactor are fixed and cannot be adjusted, and are all based on rated current and fixed with rated current, but the magnetic control reactor has adjustable capacity and large working range due to the particularity of working, when the capacity is greatly changed, the rated current has a large variation range, and if constant rated current before variation is adopted for constant value calculation, protection operation failure or misoperation can be caused, so that the reactor cannot work normally, and the safe and stable operation of the whole power system can be influenced in serious cases.
The reactor protection device adopted in the current engineering can not recognize the change of the working condition of the reactor, and no algorithm which can self-adaptively and automatically track the change of the running capacity of the reactor and correct the protection in real time exists.
Disclosure of Invention
The technical problem to be solved by the invention is to overcome the defects of the prior art and provide a magnetic control type parallel reactor running capacity automatic tracking method based on parameter identification.
in order to solve the technical problem, the invention provides a magnetic control type parallel reactor operation capacity automatic tracking method based on parameter identification, which comprises the following steps:
1) Obtaining the working voltage of the controllable reactor by using a voltage transformer TV, and obtaining the current flowing through the controllable reactor by using a current transformer TA 1;
2) Solving effective values of current and voltage fundamental waves by adopting a full-wave Fourier algorithm;
3) Calculating the impedance of the controllable reactor;
4) And solving the real-time operation capacity of the controllable reactor according to the calculated impedance of the controllable reactor.
in the foregoing step 3), considering the influence of the neutral point reactor on the capacity of the controllable reactor, the equation for calculating the impedance of the controllable reactor is as follows:
Wherein Z C is a controllable reactor impedance value, I 1 is an effective value of a current fundamental wave flowing through the head end of the controllable reactor, U is an effective value of a voltage fundamental wave of a line where the controllable reactor is located, Z g is a neutral point reactor impedance value, and I 1A, I 1B and I 1C are three-phase currents flowing through the head end of the controllable reactor.
In the foregoing step 4), the calculation formula of the real-time operation capacity of the controllable reactor is as follows:
Wherein S C is the real-time operation capacity of the controllable reactor, and U e is the nameplate rated voltage of the controllable reactor.
according to the judgment result of the starting element introduced with the protection device, when the capacity of the controllable reactor is adjusted, the current and the voltage are changed, the impedance calculation of the controllable reactor is not carried out at the moment, and after the starting element returns, the controllable reactor runs stably, and the impedance calculation of the controllable reactor is carried out.
When the capacity change of the controllable reactor exceeds the set threshold value, the operation capacity of the controllable reactor is corrected, namely the real-time operation capacity of the controllable reactor is calculated according to the impedance value of the reactor.
The aforementioned threshold value is 5% of the rated capacity of the controllable reactor.
The invention has the beneficial effects that:
The invention can ensure the protection sensitivity in real time, avoid the occurrence of the false operation of the reactor protection failure caused by the change of the working condition of the reactor, and improve the protection sensitivity and reliability.
Drawings
FIG. 1 is a diagram of a magnetically controlled shunt reactor protection configuration;
FIG. 2 is a flow chart of automatic tracking of reactor capacity;
fig. 3 is an equivalent circuit diagram of impedance calculation of the controllable reactor.
Detailed Description
The invention is further described below. The following examples are only for illustrating the technical solutions of the present invention more clearly, and the protection scope of the present invention is not limited thereby.
the invention utilizes the parameter identification principle, analyzes and confirms the capacity change of the reactor by identifying the impedance parameter of the reactor, and calculates the running capacity of the reactor in real time according to the impedance value of the reactor. In order to avoid frequent switching of the operation capacity of the reactor in the capacity adjustment process, a protection starting element is used as a correction algorithm locking element, the protection is corrected only when the reactor is stably operated when the protection is not started, the operation capacity of the reactor adopted by the protection is corrected, and a correction algorithm flow chart is shown in fig. 2, so that the reliability and the sensitivity of the protection are ensured in real time, the phenomenon that the reactor is prevented from being wrongly operated due to protection rejection when the working condition of the reactor is changed is avoided, and the sensitivity and the reliability of the protection are improved.
The invention is realized concretely as follows:
(1) In order to determine the working state of the magnetic control type reactor in real time and determine the working capacity of the reactor, the impedance parameter of the reactor needs to be monitored in real time, and the change of the capacity of the reactor is determined by monitoring the change of the impedance parameter. The specific calculation process is as follows:
as shown in fig. 1, a voltage transformer TV is used to obtain the operating voltage of the controllable reactor, a current transformer TA1 is used to obtain the current flowing through the controllable reactor, the obtained sampled current and voltage values are used to calculate the effective values of the current and voltage fundamental waves by using the existing full-wave fourier algorithm, and then the impedance parameters of the controllable reactor are calculated, because the reactor may run asymmetrically during normal operation and current may flow through the neutral point reactor, the influence of the neutral point reactor on the calculated capacity must be considered during impedance calculation, and the equivalent circuit diagram of impedance calculation of the controllable reactor is shown in fig. 3.
in the formula, Z C is a controllable reactor impedance value, I 1 is a fundamental wave current effective value flowing through the head end of the controllable reactor, namely TA1, U is a voltage of a line where the controllable reactor is located, namely a fundamental wave effective value of TV, Z g is a neutral point reactor impedance value, the value can be obtained through reactor nameplate parameters, and I 1A, I 1B and I 1C are three-phase currents flowing through the head end of the controllable reactor.
The real-time operation capacity of the controllable reactor can be obtained according to the calculated impedance parameters of the controllable reactor, and the calculation formula of the operation capacity of the reactor is as follows:
In the formula, S C is the operation capacity of the controllable reactor, Z C is the impedance value of the controllable reactor, and U e is the nameplate rated voltage of the controllable reactor.
(2) in order to avoid the influence of current change on the identification of the impedance parameters of the reactor caused by the change of the capacity of the reactor in the change process, and to cause larger calculation errors of the impedance parameters, the calculation of the parameters of the reactor must be effective only after the reactor operates stably, starting element judgment results of the existing protection device are introduced, when the capacity of the reactor is adjusted, the current voltage changes, the protection device starts, the calculation of the impedance parameters is not carried out at the moment, when the starting element returns, the operation of the reactor is stable, and the calculation of the impedance parameters is carried out at the moment, so that the adverse influence on the identification of the impedance parameters of the reactor in the capacity adjustment process of the reactor can be avoided, and the accuracy of the.
(3) Meanwhile, the phenomenon that the running capacity of the reactor is frequently corrected in the reactor capacity adjusting process, the load of the protection device is increased, and the protection device is abnormal or is in protection misoperation is avoided. Therefore, the correction threshold is increased while the operation capacity is corrected, and the operation capacity of the reactor is corrected only when the capacity change of the reactor exceeds the rated capacity of the reactor, namely 5% of the nameplate capacity parameter, namely the operation capacity of the reactor is calculated in real time according to the impedance value of the reactor. Therefore, frequent correction of the operation capacity by the algorithm is avoided, the practicability and reliability of the correction algorithm are ensured, and the sensitivity and reliability of the protection of the magnetic control type shunt reactor are improved.
The above description is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, several modifications and variations can be made without departing from the technical principle of the present invention, and these modifications and variations should also be regarded as the protection scope of the present invention.
Claims (4)
1. the method for automatically tracking the running capacity of the magnetic control type shunt reactor based on parameter identification is characterized by comprising the following steps of:
1) Obtaining the working voltage of the controllable reactor by using a voltage transformer TV, and obtaining the current flowing through the controllable reactor by using a current transformer TA 1;
2) Solving effective values of current and voltage fundamental waves by adopting a full-wave Fourier algorithm;
3) Calculating the impedance of the controllable reactor; considering the influence of the neutral point reactor on the capacity of the controllable reactor, the formula for calculating the impedance of the controllable reactor is as follows:
Z C is a controllable reactor impedance value, I 1 is a current fundamental wave effective value flowing through the head end of the controllable reactor, U is a voltage fundamental wave effective value of a line where the controllable reactor is located, Z g is a neutral point reactor impedance value, and I 1A, I 1B and I 1C are three-phase currents flowing through the head end of the controllable reactor;
4) Obtaining the real-time operation capacity of the controllable reactor according to the calculated impedance of the controllable reactor; the calculation formula of the real-time operation capacity of the controllable reactor is as follows:
wherein S C is the real-time operation capacity of the controllable reactor, and U e is the nameplate rated voltage of the controllable reactor.
2. The method for automatically tracking the running capacity of the magnetic control type parallel reactor based on the parameter identification as claimed in claim 1, wherein the judgment result of a starting element of the protection device is introduced, when the capacity of the controllable reactor is adjusted, the current and the voltage are changed, the impedance calculation of the controllable reactor is not carried out at the moment, and when the starting element returns, the controllable reactor runs stably, and the impedance calculation of the controllable reactor is carried out.
3. the method for automatically tracking the running capacity of the magnetically controlled shunt reactor based on the parameter identification as claimed in claim 1, wherein when the capacity variation of the controllable reactor exceeds a set threshold, the running capacity of the controllable reactor is corrected, that is, the real-time running capacity of the controllable reactor is calculated according to the impedance value of the reactor.
4. the method for automatically tracking the operating capacity of the magnetically controlled shunt reactor based on the parameter identification as claimed in claim 3, wherein the threshold is 5% of the rated capacity of the controllable reactor.
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| CN103383419B (en) * | 2013-04-19 | 2016-02-24 | 国家电网公司 | A kind of controllable magnetic control shunt reactor combine regulation test unit |
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