CN100568657C - HVDC (High Voltage Direct Current) transmission system 50Hz and 100Hz protection setting method - Google Patents
HVDC (High Voltage Direct Current) transmission system 50Hz and 100Hz protection setting method Download PDFInfo
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Abstract
The present invention is a kind of HVDC (High Voltage Direct Current) transmission system 50Hz and 100Hz protection setting method.50Hz protection setting method includes following process: 1) obtain 50Hz component or 100Hz protection input variable after 50Hz protection input variable or the filtering of 100Hz protection input variable process low pass filter (1); 2) definite value in above-mentioned 50Hz component or 100Hz protection input variable and the comparator (2) compares, and in the 50Hz protection setting method, if greater than definite value, the electric current section falls in startup through delay time T1, and delay time T1 cooperates with utmost point control and valve control redundant switching time; Arrive delay time T2, start direct current locking order, delay time T2 cooperates with the over-stress capability of converter valve, and cooperates with other converter valve protection.In the 100Hz protection setting method; definite value in above-mentioned 100Hz component and the comparator (2) relatively; if greater than definite value, just start direct current locking order behind the T through time-delay, meet with stresses in the DC transmission system during with the fault in ac transmission system corresponding definite value with AC system of parts of maximum of time-delay T cooperates.The present invention not only realizes the backup protection of converter valve fault and fault in ac transmission system, and under the prerequisite that guarantees main equipment safety, avoids handing in the straight mixing electrical network many times direct currents to fall system's destabilization problems that power or locking cause simultaneously.
Description
Technical field:
The present invention is a kind of HVDC (High Voltage Direct Current) transmission system 50Hz and 100Hz protection setting method, belongs to the innovative technology of HVDC (High Voltage Direct Current) transmission system 50Hz and 100Hz protection setting method.
Background technology:
High voltage dc transmission technology is significant to operation of power networks and development; 50Hz and 100Hz protection is two kinds of protections of high straightening transmission system, and its defencive function is a protection converter valve when converter trigger impulse fault, converter valve fault, commutation failure fault and single-phase fault.The setting method of 50Hz and 100Hz protection is as follows in the existing domestic and international high voltage direct current transmission project:
1) calculates 50Hz and 100Hz component content in DC line or the utmost point neutral bus;
2) definite value Consideration: ac and dc systems background harmonics, converter triggers unusual 50Hz that produces and 100Hz component, and direct current system prevents the minimum current requirement of discontinuous current, the ability that converter valve meets with stresses, direct current system transmission power level, DC line harmonic impedance characteristic;
3) time-delay Consideration: control system redundant system switching time, with cooperating of other protection, the time is removed in the Changqing of fault in ac transmission system;
4) time-delay method adopts specified time or inverse time lag;
5) protection action: be divided into two sections, first section is fallen power or warning, second section locking direct current system, jumps AC circuit breaker.
There are following shortcoming in 50Hz and 100Hz protection setting method in the existing high voltage direct current transmission project:
1) principle of adjusting of 50Hz protection and 100Hz has mainly been considered the ability to bear of converter valve, does not consider the over-stress capability of miscellaneous equipment;
2) principle of adjusting of 50Hz protection and 100Hz protection does not have clear and definite difference, and same action characteristic and time-delay have been adopted in the 50Hz protection and the 100Hz protection of some high voltage DC engineering.
3) the Changqing of the fault in ac transmission system time of removing is generally 600ms, the longest 1500ms that also is no more than.Therefore, at AC system generation unbalanced fault, when protecting tripping or breaker failure fast, fault clearing time is longer, may cause many times direct current 100Hz protection actions and locking in the AC operational system, and power grid security is produced devastating impact.
Therefore, existing 100Hz protection setting method does not take into full account the characteristics of AC operational system, and the over-stress capability that can not make full use of the HVDC (High Voltage Direct Current) transmission system main equipment is to strengthen the stability of electrical network when the fault in ac transmission system.
Summary of the invention:
The objective of the invention is to consider the problems referred to above and provide a kind of, the HVDC (High Voltage Direct Current) transmission system 50Hz protection setting method that definite value cooperates with the valve device ability to bear its backup protection mainly as the valve fault.
Another object of the present invention is to consider the problems referred to above and provide a kind of under the prerequisite that guarantees main equipment safety, can be according to HVDC (High Voltage Direct Current) transmission system main equipment overstress ability to bear decision protection action definite value and the HVDC (High Voltage Direct Current) transmission system 100Hz of time protection setting method.
HVDC (High Voltage Direct Current) transmission system 50Hz protection setting method of the present invention includes following process:
1) obtains the 50Hz component after the filtering of 50Hz protection input variable process low pass filter;
2) if definite value in above-mentioned 50Hz component and the comparator relatively greater than definite value, starts through first section action delay time T of HVDC (High Voltage Direct Current) transmission system 50Hz 1 and to fall the electric current section, and delay time T1 is greater than utmost point control and valve control redundant system switching time; Arrive second section action delay time T 2 of HVDC (High Voltage Direct Current) transmission system 50Hz protection, start direct current locking order, delay time T2 is less than the time of avoiding causing the converter valve overstress, and cooperates with other converter valve protection; Above-mentioned startup is fallen the electric current section and is meant that current-order falls in startup in the high-voltage dc transmission electric control system, and the direct current in the high-voltage direct current is reduced to 30% of rated current.
Said process 2) utmost point control and valve control redundant system switching time are 150ms～300ms in.
Said process 2) delay time T1 is 150ms～300ms in, and delay time T2 is 650ms～1000ms, and T2 is by the over-stress capability decision of converter valve.
Said process 1) 50Hz protection input variable is DC line electric current I dL in, or converter valve high voltage side current IdH, or converter valve low-pressure side electric current I dN.
HVDC (High Voltage Direct Current) transmission system 100Hz protection setting method of the present invention, it includes following process:
1) obtains the 100Hz component after the filtering of 100Hz protection input variable process low pass filter;
2) definite value in above-mentioned 100Hz component and the comparator relatively, if greater than definite value, through just starting direct current locking order behind the time-delay T, meet with stresses in the DC transmission system during with the fault in ac transmission system corresponding definite value with AC system of parts of maximum of time-delay T cooperates.
The maximum parts that meet with stresses in the DC transmission system when determining fault in ac transmission system said process 2) reach the method for determining delay time T and comprise the steps:
1) sets up the HVDC (High Voltage Direct Current) transmission system analogue system that comprises the main equipment detailed model;
2) by the calculating of theory analysis and analogue system, maximum parts meet with stresses in the DC transmission system when finding fault in ac transmission system;
3) determine to cause HVDC (High Voltage Direct Current) transmission system main equipment stress maximum, the harshest operating mode;
4) stress that weak element under the harshest operating mode is born checks;
5) result according to checking computations determines action behavior and the delay time T that 100Hz protects with the relevant definite value of AC system protection.
The maximum parts that meet with stresses in the DC transmission system during above-mentioned fault in ac transmission system are damped resistors of 3 alternating current filters.
Said process 2) delay time T is 700ms～3000ms in.
Said process 1) 100Hz protection input variable is DC line electric current I dL in, or converter valve high voltage side current IdH, or converter valve low-pressure side electric current I dN.
The present invention is because employing is separately adjusted 50Hz and 100Hz protection, and the 50Hz protection is mainly as the backup protection of valve fault, and definite value cooperates with the valve device ability to bear; The 100Hz protection is mainly as the AC system backup protection; definite value and the relevant definite value of AC system and the method for direct current main equipment over-stress capability cooperation; therefore; it not only realizes the backup protection of valve fault; and under the prerequisite that guarantees main equipment safety; can be according to HVDC (High Voltage Direct Current) transmission system main equipment overstress ability to bear decision 100Hz protection action definite value and time; thereby in the AC system unbalanced fault duration when longer; avoid that power or locking fall in many times direct currents simultaneously in the alternating current net, to overcome weak point of the prior art.The present invention can use the electric power system of AC operation and the many drop points of direct current, has a good application prospect.
Description of drawings:
Fig. 1 is the principle schematic of 50Hz protection setting method in the embodiment of the invention.
Fig. 2 is that the ac filter resistor holds heat and the relation that exchanges the unbalanced fault duration in the embodiment mesohigh DC transmission engineering.
Fig. 3 is the principle schematic of 100Hz protection setting method in the embodiment of the invention.
Embodiment:
Embodiment:
The schematic diagram of HVDC (High Voltage Direct Current) transmission system 50Hz protection setting method of the present invention includes following process as shown in Figure 1:
1) obtain the 50Hz component after 1 filtering of 50Hz protection input variable process low pass filter, 50Hz protection input variable is DC line electric current I dL, or converter valve high voltage side current IdH, or converter valve low-pressure side electric current I dN.
2) definite value in above-mentioned 50Hz component and the comparator 2 compares, if greater than definite value, the electric current section falls in startup through delay time T1, and delay time T1 cooperates with utmost point control and valve control redundant switching time; Arrive delay time T2, start direct current locking order, delay time T2 cooperates with the over-stress capability of converter valve, and cooperates with other converter valve protection.
In the present embodiment, said process 2) starts in that to fall the electric current section be to reduce to 30% of rated current.Said process 2) utmost point control and valve control redundant system switching time are 150ms～300ms in.Said process 2) delay time T1 is 150ms～300ms in, and T2 is 650ms～1000ms.
The schematic diagram of HVDC (High Voltage Direct Current) transmission system 100Hz protection setting method of the present invention includes following process as shown in Figure 3:
1) obtains the 100Hz component after 1 filtering of 100Hz protection input variable process low pass filter; 100Hz protection input variable is DC line electric current I dL, or converter valve high voltage side current IdH, or converter valve low-pressure side electric current I dN.
2) definite value in above-mentioned 100Hz component and the comparator 2 relatively, if greater than definite value, through just starting direct current locking order behind the time-delay T, the corresponding definite value with AC system of tolerance of parts of maximum of time-delay T meeting with stresses during with fault in ac transmission system in the DC transmission system matches, and delay time T is generally 700ms～3000ms.
The maximum parts that meet with stresses in the DC transmission system when determining fault in ac transmission system said process 2) reach the method for determining delay time T and comprise the steps:
1) sets up the HVDC (High Voltage Direct Current) transmission system analogue system that comprises the main equipment detailed model;
2) by the calculating of theory analysis and analogue system, maximum parts meet with stresses in the DC transmission system when finding fault in ac transmission system;
3) determine to cause the harshest operating mode of HVDC (High Voltage Direct Current) transmission system main equipment stress maximum;
4) stress that weak element under the harshest operating mode is born checks;
5) determine action behavior and the delay time T that 100Hz protects according to the relevant definite value of result of checking computations with AC system.
In the present embodiment, through theory analysis and simulation calculation, find the stress maximum that the damped resistor of 3 alternating current filters bears, when the single phase ground fault fault of converter transformer end of incoming cables the heating of resistor the most severe, and definite delay time T is 3000ms.Utilize analogue system to calculate the ac filter resistor and hold heat and the relation that exchanges the unbalanced fault duration as shown in Figure 2.Said process 2) 100Hz component and definite value compare in, and the 100Hz component, cooperates with the suitable definite value with AC system of damped resistor of 3 alternating current filters through just starting direct current locking order behind the time-delay 3000ms greater than definite value.
Claims (9)
1, a kind of HVDC (High Voltage Direct Current) transmission system 50Hz protection setting method is characterized in that including following process:
1) obtains the 50Hz component after the filtering of 50Hz protection input variable process low pass filter (1);
2) if definite value in above-mentioned 50Hz component and the comparator (2) relatively greater than definite value, starts through first section action delay time T of HVDC (High Voltage Direct Current) transmission system 50Hz 1 and to fall the electric current section, and delay time T1 is greater than utmost point control and valve control redundant system switching time; Arrive second section action delay time T 2 of HVDC (High Voltage Direct Current) transmission system 50Hz protection, start direct current locking order, delay time T2 is less than the time of avoiding causing the converter valve overstress, and cooperates with other converter valve protection; Above-mentioned startup is fallen the electric current section and is meant that current-order falls in startup in the high-voltage dc transmission electric control system, and the direct current in the high-voltage direct current is reduced to 30% of rated current.
2, HVDC (High Voltage Direct Current) transmission system 50Hz according to claim 1 protection setting method is characterized in that said process 2) in utmost point control and valve control redundant system switching time be 150ms～300ms.
3, HVDC (High Voltage Direct Current) transmission system 50Hz according to claim 1 protection setting method is characterized in that said process 2) in delay time T1 be 150ms～300ms, delay time T2 is 650ms～1000ms, T2 is by the over-stress capability decision of converter valve.
4, HVDC (High Voltage Direct Current) transmission system 50Hz protection setting method according to claim 1; it is characterized in that said process 1) in 50Hz protection input variable be DC line electric current (IdL); or converter valve high voltage side current (IdH), or converter valve low-pressure side electric current (IdN).
5, a kind of HVDC (High Voltage Direct Current) transmission system 100Hz protection setting method is characterized in that including following process:
1) obtains the 100Hz component after the filtering of 100Hz protection input variable process low pass filter (1);
2) definite value in above-mentioned 100Hz component and the comparator (2) relatively, if greater than definite value, just start direct current locking order behind the T through time-delay, meet with stresses in the DC transmission system during with the fault in ac transmission system corresponding definite value with AC system of parts of maximum of time-delay T cooperates.
6, HVDC (High Voltage Direct Current) transmission system 100Hz according to claim 5 protection setting method is characterized in that said process 2) in meet with stresses in the DC transmission system when determining fault in ac transmission system maximum parts and determine that the method for delay time T comprises the steps:
1) sets up the HVDC (High Voltage Direct Current) transmission system analogue system that comprises the main equipment detailed model;
2) by the calculating of theory analysis and analogue system, maximum parts meet with stresses in the DC transmission system when finding fault in ac transmission system;
3) determine to cause HVDC (High Voltage Direct Current) transmission system main equipment stress maximum, the harshest operating mode;
4) stress that weak element under the harshest operating mode is born checks;
5) result according to checking computations determines action behavior and the delay time T that 100Hz protects with the relevant definite value of AC system protection.
7, HVDC (High Voltage Direct Current) transmission system 100Hz according to claim 6 protection setting method, the maximum parts that meet with stresses in the DC transmission system when it is characterized in that above-mentioned fault in ac transmission system are damped resistors of 3 alternating current filters.
8, HVDC (High Voltage Direct Current) transmission system 100Hz according to claim 7 protection setting method is characterized in that said process 2) in delay time T be 700ms～3000ms.
9, HVDC (High Voltage Direct Current) transmission system 100Hz protection setting method according to claim 5; it is characterized in that said process 1) in 100Hz protection input variable be DC line electric current (IdL); or converter valve high voltage side current (IdH), or converter valve low-pressure side electric current (IdN).
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| CN103268429A (en) * | 2013-06-07 | 2013-08-28 | 中国南方电网有限责任公司超高压输电公司 | Performance evaluating method and system for high-voltage direct-current (DC) power transmission system 100Hz protection |
| CN103268429B (en) * | 2013-06-07 | 2015-04-15 | 中国南方电网有限责任公司超高压输电公司 | Performance evaluating method and system for high-voltage direct-current (DC) power transmission system 100Hz protection |
| CN103762561A (en) * | 2014-01-10 | 2014-04-30 | 南方电网科学研究院有限责任公司 | Direct-current differential protection setting method for high-voltage direct-current transmission system |
| CN103762561B (en) * | 2014-01-10 | 2015-11-18 | 南方电网科学研究院有限责任公司 | Direct-current differential protection setting method for high-voltage direct-current transmission system |
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