CN114089058B - Parallel reactor turn-to-turn protection method and device suitable for bus voltage - Google Patents
Parallel reactor turn-to-turn protection method and device suitable for bus voltage Download PDFInfo
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Abstract
The invention relates to a parallel reactor turn-to-turn protection method and a parallel reactor turn-to-turn protection device suitable for bus voltage, wherein when the comprehensive harmonic wave of self-generated zero sequence current at the head end of a parallel reactor is identified to be larger than a first threshold value, the turn-to-turn protection is directly locked; simultaneously continuously identifying the effective value and the second harmonic content and the third harmonic content of each phase of three-phase current at the head end of the reactor, and if the effective value of any phase of current is larger than a second threshold value, simultaneously, the second harmonic content and the third harmonic content in the phase of current are smaller than a third threshold value, and simultaneously, when the measured voltage of the phase reactor is smaller than a fourth threshold value, identifying that the fault exists in the parallel reactor area and opening inter-turn protection; otherwise, the fault outside the shunt reactor area is identified, and turn-to-turn protection is locked. The invention can prevent the turn-to-turn protection from misoperation when the voltage takes the bus PT and the system generates LC resonance; and when the inter-turn protection fault occurs in the reactor generation area or the inter-turn fault, the inter-turn protection isolation fault can be reliably opened, and the applicability of the inter-turn protection of the parallel reactor is improved.
Description
Technical Field
The invention relates to the technical field of power system fault detection, in particular to a parallel reactor turn-to-turn protection method and device suitable for bus voltage.
Background
At present, with the acceleration of the construction speed of 220kV power grids in China, when long-distance power transmission or cable lines transmit power, as the capacitive reactive power of the lines increases, in order to balance reactive power of the system and limit overvoltage of the system, a shunt reactor is additionally arranged when most 220kV lines transmit power. Because 220kV shunt reactor equipment is special, small and is of a three-phase integrated structure, the difference between the 220kV shunt reactor equipment and a 500kV high-voltage split-phase reactor is very large, LC resonance is easy to generate when a circuit breaker is pulled to switch, and particularly when reactive compensation of the shunt reactor is inappropriate, the LC resonance phenomenon is more obvious, and the reactor iron core is easy to saturate under the action of low-frequency non-periodic components. In addition, in a 220kV voltage class system, line PT equipment is often arranged on a bus, for an idle power transmission line with a shunt reactor, when a three-phase opening of a breaker switch is operated, bus voltage and line current are isolated into two independent systems, the frequency and amplitude of the voltage and the current lose significance, and the conventional turn-to-turn protection based on the zero sequence power direction is caused to malfunction, so that the line charging operation fails.
Disclosure of Invention
Based on the above situation in the prior art, the invention aims to provide a parallel reactor turn-to-turn protection method and device suitable for bus voltage, aiming at the operation working condition of a bus side voltage transformer for the turn-to-turn protection of the parallel reactor, the invention not only can prevent the turn-to-turn protection from misoperation when the voltage gets the bus PT and the system generates LC resonance; and when the inter-turn protection fault occurs in the reactor generation area or the inter-turn fault, the inter-turn protection isolation fault can be reliably opened, and the applicability of the inter-turn protection of the parallel reactor is improved.
To achieve the above object, according to one aspect of the present invention, there is provided a shunt reactor turn-to-turn protection method applicable to a bus voltage, including:
Collecting three-phase current and three-phase voltage at the head end of the shunt reactor, and respectively calculating a plurality of electric parameters related to the three-phase current and the three-phase voltage;
And comparing the relation among the plurality of electric parameters, and judging the open turn-to-turn protection or the closed turn-to-turn protection according to the comparison result.
Further, the plurality of electrical parameters related to the three-phase current and the three-phase voltage include a phase current effective value of the three-phase current and the three-phase voltage, a head-end self-generated zero-sequence current, a comprehensive harmonic content of the head-end self-generated zero-sequence current, and a self-generated zero-sequence voltage.
Further, the comprehensive harmonic content of the head-end self-generated zero sequence current is calculated according to the following formula:
Wherein 3I 0Z is the comprehensive harmonic content of the zero sequence current self-produced by the head end; 3I 02 and 3I 03 are the second harmonic and the third harmonic, respectively, in the self-generated zero sequence current.
Further, the comparing the relationships among the plurality of electrical parameters and judging the open turn-to-turn protection or the closed turn-to-turn protection according to the comparison result includes:
comparing whether the comprehensive harmonic content in the head-end self-generated zero sequence current and the first threshold value meet the following formula:
3I0Z>k1*3I0
wherein k 1 is a first threshold; 3I 0 is the self-generated zero sequence current of the head end;
if the comprehensive harmonic content and the first threshold value in the head-end self-generated zero sequence current meet the formula, locking inter-turn protection; if not, the next step is performed.
Further, the method further comprises the following steps:
If the comprehensive harmonic content in the head-end self-generated zero-sequence current and the first threshold do not meet the formula, comparing any one phase current effective value in the head-end three-phase current with the second threshold, and if the harmonic content in any one phase current and the third threshold meet the following formula:
wherein, I a、Ib、Ic is the effective value of the head-end three-phase current respectively; i set2 is a second threshold, and I a2、Ib2、Ic2 is the second harmonic of the head-end three-phase current respectively; i set3 is a third threshold, and I a3、Ib3、Ic3 is the third harmonic of the head-end three-phase current respectively;
if the effective value and the second threshold value of any phase current in the three-phase current at the head end and the harmonic content and the third threshold value in any phase current meet the above formula, performing the next step; if the above formula is not satisfied, the inter-turn protection is blocked.
Further, the method further comprises the following steps:
if any one phase current effective value and the second threshold value in the head-end three-phase current and the harmonic content and the third threshold value in any one phase current meet the above formula, comparing whether the phase measurement voltage and the fourth threshold value of the reactor meet the following formula:
wherein I set4 is a fourth threshold, Voltage and current of any phase at the head end of the parallel reactor respectively,/>Or c; k 2 is the positive sequence impedance coefficient of the reactor; r L is the reactor reactance of the shunt reactor; r Z is neutral reactance;
If the phase measurement voltage and the fourth threshold value of the reactor meet the above formula, judging that the fault in the shunt reactor area occurs; if not, then blocking inter-turn protection
Further, the method further comprises the following steps:
And if the fault in the shunt reactor area is judged to occur, opening inter-turn protection after the preset delay time.
According to a second aspect of the invention, there is provided a shunt reactor turn-to-turn protection device suitable for bus voltage, comprising an electrical parameter acquisition and calculation module and a fault judgment module; wherein,
The electric parameter acquisition and calculation module is used for acquiring three-phase current and three-phase voltage at the head end of the shunt reactor and calculating a plurality of electric parameters related to the three-phase current and the three-phase voltage respectively;
The fault judging module is used for comparing the relation among a plurality of electric parameters and judging open turn-to-turn protection or closed turn-to-turn protection according to a comparison result.
Further, the plurality of electrical parameters related to the three-phase current and the three-phase voltage include a phase current effective value of the three-phase current and the three-phase voltage, a head-end self-generated zero-sequence current, a comprehensive harmonic content of the head-end self-generated zero-sequence current, and a self-generated zero-sequence voltage.
Further, the comprehensive harmonic content of the head-end self-generated zero sequence current is calculated according to the following formula:
Wherein 3I 0Z is the comprehensive harmonic content of the zero sequence current self-produced by the head end; 3I 02 and 3I 03 are the second harmonic and the third harmonic, respectively, in the self-generated zero sequence current.
In summary, the invention provides a method and a device for protecting inter-turns of a parallel reactor suitable for bus voltage, which are used for directly locking inter-turns of the parallel reactor for protecting inter-turns of the parallel reactor by identifying that when the comprehensive harmonic of self-generated zero-sequence current at the head end of the parallel reactor is larger than a first threshold value, the operating condition of a bus-side voltage transformer is adopted for the inter-turns of the parallel reactor; meanwhile, continuously identifying the effective value and the second harmonic content and the third harmonic content of each phase of three-phase current at the head end of the reactor, if the effective value of any phase of current is larger than a second threshold value, the second harmonic content and the third harmonic content in the phase of current are smaller than a third threshold value, and when the measured voltage of the phase reactor is smaller than a fourth threshold value, identifying that faults exist in a shunt reactor area, and opening inter-turn protection after the confirmation of preset delay time; otherwise, the fault outside the shunt reactor area is identified, and turn-to-turn protection is locked. The technical scheme provided by the invention can prevent turn-to-turn protection misoperation when the voltage takes the bus PT and the system generates LC resonance; and when the inter-turn protection fault occurs in the reactor generation area or the inter-turn fault, the inter-turn protection isolation fault can be reliably opened, and the applicability of the inter-turn protection of the parallel reactor is improved.
Drawings
FIG. 1 is a schematic diagram of a system architecture for parallel reactor voltage acquisition bus voltage transformer operation;
Fig. 2 is a flow chart of a shunt reactor turn-to-turn protection method in an embodiment of the invention.
Detailed Description
The objects, technical solutions and advantages of the present invention will become more apparent by the following detailed description of the present invention with reference to the accompanying drawings. It should be understood that the description is only illustrative and is not intended to limit the scope of the invention. In addition, in the following description, descriptions of well-known structures and techniques are omitted so as not to unnecessarily obscure the present invention.
The following describes the technical scheme of the present invention in detail with reference to the accompanying drawings. According to one embodiment of the invention, a shunt reactor turn-to-turn protection method applicable to bus voltage is provided. The parallel reactor turn-to-turn protection method based on the bus voltage is specially used for preventing the parallel reactor turn-to-turn protection misoperation when the bus voltage is taken from a bus side voltage transformer and the system generates LC resonance; meanwhile, under the working condition, when the inter-turn and intra-zone faults occur to the shunt reactor, the shunt reactor can reliably act. In fig. 1, 3I 0 is a self-generated zero-sequence current of a head end of the shunt reactor, 3U 0 is a self-generated zero-sequence voltage of the head end of the shunt reactor, R L is a reactance of the shunt reactor, R Z is a neutral point reactance, and R S0 is a system reactance. The flow chart of the turn-to-turn protection method of the shunt reactor is shown in fig. 2, and comprises the following steps:
And collecting three-phase current and three-phase voltage at the head end of the parallel reactor, and respectively calculating a plurality of electric parameters related to the three-phase current and the three-phase voltage. The plurality of electric parameters related to the three-phase current and the three-phase voltage comprise phase current effective values of the three-phase current and the three-phase voltage, head-end self-generated zero-sequence current, comprehensive harmonic content of the head-end self-generated zero-sequence current and head-end self-generated zero-sequence voltage. The phase current effective value, the head-end self-generated zero sequence current and the head-end self-generated zero sequence voltage of the three-phase current and the three-phase voltage can be calculated by adopting a full-cycle Fourier algorithm. The sum operation can be carried out on the second harmonic and the third harmonic to obtain the comprehensive harmonic of the self-generated zero sequence current of the head end, and the comprehensive harmonic content of the self-generated zero sequence current of the head end is calculated according to the following formula:
Wherein 3I 0Z is the comprehensive harmonic content of the zero sequence current self-produced by the head end; 3I 02 and 3I 03 are the second harmonic and the third harmonic, respectively, in the self-generated zero sequence current.
And comparing the relation among the plurality of electric parameters, and judging the open turn-to-turn protection or the closed turn-to-turn protection according to the comparison result. The method is realized by the following steps:
comparing whether the comprehensive harmonic content in the head-end self-generated zero sequence current and the first threshold value meet the following formula:
3I0Z>k1*3I0
Wherein k 1 is a first threshold value, the value range is (0.1, 0.3), and 3I 0 is the self-generated zero sequence current of the head end;
if the comprehensive harmonic content and the first threshold value in the head-end self-generated zero sequence current meet the formula, locking inter-turn protection; if not, the next step is performed.
If the comprehensive harmonic content in the head-end self-generated zero-sequence current and the first threshold do not meet the formula, comparing any one phase current effective value in the head-end three-phase current with the second threshold, and if the harmonic content in any one phase current and the third threshold meet the following formula:
Wherein, I a、Ib、Ic is the effective value of the head-end three-phase current respectively; i set2 is a second threshold value, the value range is (0,0.12I e),Ie is the rated current of the head end of the reactor, I a2、Ib2、Ic2 is the second harmonic of the three-phase current of the head end respectively, I set3 is a third threshold value, the value range is (0.07,0.15), and I a3、Ib3、Ic3 is the third harmonic of the three-phase current of the head end respectively;
if the effective value and the second threshold value of any phase current in the three-phase current at the head end and the harmonic content and the third threshold value in any phase current meet the above formula, performing the next step; if the above formula is not satisfied, the inter-turn protection is blocked.
If any one phase current effective value and the second threshold value in the head-end three-phase current and the harmonic content and the third threshold value in any one phase current meet the above formula, comparing whether the phase measurement voltage and the fourth threshold value of the reactor meet the following formula:
wherein I set4 is a fourth threshold, Voltage and current of any phase at the head end of the parallel reactor respectively,/>Or c; k 2 is the positive sequence impedance coefficient of the reactor, and the value range is 0.4,0.9; r L is the reactor reactance of the shunt reactor; r Z is neutral reactance;
If the phase measurement voltage and the fourth threshold value of the reactor meet the above formula, judging that the fault in the shunt reactor area occurs; if not, locking the inter-turn protection to prevent the malfunction of the inter-turn protection.
If the fault in the shunt reactor area is judged to occur, opening inter-turn protection after the preset delay time t is passed, wherein the value of the preset delay time t is less than or equal to 40ms.
According to a second embodiment of the invention, there is provided a shunt reactor turn-to-turn protection device applicable to bus voltage, including an electric parameter acquisition and calculation module and a fault judgment module; wherein,
The electric parameter acquisition and calculation module is used for acquiring three-phase current and three-phase voltage at the head end of the shunt reactor and calculating a plurality of electric parameters related to the three-phase current and the three-phase voltage respectively;
The fault judging module is used for comparing the relation among a plurality of electric parameters and judging open turn-to-turn protection or closed turn-to-turn protection according to a comparison result.
Further, the plurality of electrical parameters related to the three-phase current and the three-phase voltage include a phase current effective value of the three-phase current and the three-phase voltage, a head-end self-generated zero-sequence current, a comprehensive harmonic content of the head-end self-generated zero-sequence current, and a self-generated zero-sequence voltage.
Further, the comprehensive harmonic content of the head-end self-generated zero sequence current is calculated according to the following formula:
Wherein 3I 0Z is the comprehensive harmonic content of the zero sequence current self-produced by the head end; 3I 02 and 3I 03 are the second harmonic and the third harmonic, respectively, in the self-generated zero sequence current.
The specific steps for realizing the functions of each module in the shunt reactor protection device according to the embodiment of the present invention are the same as those in the shunt reactor protection method according to the first embodiment of the present invention, and are not described herein again.
In summary, the invention relates to a method and a device for protecting inter-turns of a parallel reactor, which are suitable for bus voltage, and the method and the device are used for directly locking the inter-turns of the parallel reactor when the operation condition of a bus-side voltage transformer is adopted for the inter-turns of the parallel reactor, and the comprehensive harmonic of the self-generated zero-sequence current at the head end of the parallel reactor is identified to be larger than a first threshold value; meanwhile, continuously identifying the effective value and the second harmonic content and the third harmonic content of each phase of three-phase current at the head end of the reactor, if the effective value of any phase of current is larger than a second threshold value, the second harmonic content and the third harmonic content in the phase of current are smaller than a third threshold value, and when the measured voltage of the phase reactor is smaller than a fourth threshold value, identifying that faults exist in a shunt reactor area, and opening inter-turn protection after the confirmation of preset delay time; otherwise, the fault outside the shunt reactor area is identified, and turn-to-turn protection is locked. The technical scheme provided by the invention can prevent turn-to-turn protection misoperation when the voltage takes the bus PT and the system generates LC resonance; and when the inter-turn protection fault occurs in the reactor generation area or the inter-turn fault, the inter-turn protection isolation fault can be reliably opened, and the applicability of the inter-turn protection of the parallel reactor is improved.
It is to be understood that the above-described embodiments of the present invention are merely illustrative of or explanation of the principles of the present invention and are in no way limiting of the invention. Accordingly, any modification, equivalent replacement, improvement, etc. made without departing from the spirit and scope of the present invention should be included in the scope of the present invention. Furthermore, the appended claims are intended to cover all such changes and modifications that fall within the scope and boundary of the appended claims, or equivalents of such scope and boundary.
Claims (2)
1. The utility model provides a shunt reactor turn-to-turn protection method suitable for busbar voltage which characterized in that includes:
Collecting three-phase current and three-phase voltage of the head end of the parallel reactor, and respectively calculating a plurality of electric parameters related to the three-phase current and the three-phase voltage, wherein the electric parameters related to the three-phase current and the three-phase voltage comprise phase current effective values of the three-phase current and the three-phase voltage, head end self-generated zero-sequence current, comprehensive harmonic content of the head end self-generated zero-sequence current and self-generated zero-sequence voltage;
The comprehensive harmonic content of the head-end self-generated zero sequence current is calculated according to the following formula:
Wherein, The comprehensive harmonic content of the zero sequence current is self-produced for the head end; /(I)And/>The second harmonic and the third harmonic in the self-generated zero sequence current are respectively;
Comparing the relation among a plurality of electric parameters, and judging open turn-to-turn protection or closed turn-to-turn protection according to a comparison result;
The comparing the relation among the plurality of electric parameters and judging the open turn-to-turn protection or the closed turn-to-turn protection according to the comparison result comprises the following steps:
comparing whether the comprehensive harmonic content in the head-end self-generated zero sequence current and the first threshold value meet the following formula:
Wherein, Is a first threshold; /(I)Self-generating zero sequence current for the head end;
If the comprehensive harmonic content and the first threshold value in the head-end self-generated zero sequence current meet the formula, locking inter-turn protection; if not, the next step is carried out;
If the comprehensive harmonic content in the head-end self-generated zero-sequence current and the first threshold do not meet the formula, comparing any one phase current effective value in the head-end three-phase current with the second threshold, and if the harmonic content in any one phase current and the third threshold meet the following formula:
Wherein, 、/>、/>The effective values of the three-phase currents at the head end are respectively; /(I)Is a second threshold,/>The second harmonic of the three-phase current at the head end respectively; /(I)Is a third threshold,/>Third harmonic waves of the three-phase current at the head end respectively;
If the effective value and the second threshold value of any phase current in the three-phase current at the head end and the harmonic content and the third threshold value in any phase current meet the above formula, performing the next step; if the formula is not satisfied, locking the inter-turn protection;
if any one phase current effective value and the second threshold value in the head-end three-phase current and the harmonic content and the third threshold value in any one phase current meet the above formula, comparing whether the phase measurement voltage and the fourth threshold value of the reactor meet the following formula:
Wherein, Is the fourth threshold,/>；/>、/>Voltage and current of any phase at the head end of the parallel reactor respectively,/>；/>Is the positive sequence impedance coefficient of the reactor; /(I)Is a parallel reactor reactance; Is neutral reactance;
If the phase measurement voltage and the fourth threshold value of the reactor meet the above formula, judging that the fault in the shunt reactor area occurs; if not, locking inter-turn protection;
And if the fault in the shunt reactor area is judged to occur, opening inter-turn protection after the preset delay time.
2. The parallel reactor inter-turn protection device suitable for bus voltage is characterized in that the parallel reactor inter-turn protection device is suitable for the parallel reactor inter-turn protection method as claimed in claim 1, and comprises an electric parameter acquisition and calculation module and a fault judgment module; wherein,
The electric parameter acquisition and calculation module is used for acquiring three-phase current and three-phase voltage at the head end of the shunt reactor and calculating a plurality of electric parameters related to the three-phase current and the three-phase voltage respectively;
The fault judging module is used for comparing the relation among a plurality of electric parameters and judging open turn-to-turn protection or closed turn-to-turn protection according to a comparison result.
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