CN104767187A - High-voltage direct-current breaker based on Sepic converter topology and fault removal method thereof - Google Patents

High-voltage direct-current breaker based on Sepic converter topology and fault removal method thereof Download PDF

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Publication number
CN104767187A
CN104767187A CN201510176341.9A CN201510176341A CN104767187A CN 104767187 A CN104767187 A CN 104767187A CN 201510176341 A CN201510176341 A CN 201510176341A CN 104767187 A CN104767187 A CN 104767187A
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breaker
voltage
inner ring
high voltage
output
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唐良义
陈维荣
唐立
刘志祥
李奇
戴朝华
张雪霞
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Southwest Jiaotong University
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Southwest Jiaotong University
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Abstract

The invention discloses a high-voltage direct-current breaker based on Sepic converter topology and a fault removal method thereof. The purpose is to solve the problems that existing breaker equipment is high in cost, low in response speed and high in operation loss. The high-voltage direct-current breaker comprises a breaker body and a control system. The control system comprises inner loop adjusting and controlling current and outer loop adjusting and controlling voltage, an auxiliary controller is additionally arranged for double-closed-loop adjusting and used for performing voltage transforming and protection controlling on the high-voltage direct-current breaker, and therefore the high-voltage direct-current breaker has the advantages of achieving more functions, being higher in on-off speed and lowering the cost better compared with a traditional high-voltage breaker. The high-voltage direct-current breaker can achieve the functions of increasing and decreasing the voltage when a high-voltage direct-current power transmission system normally operates, can achieve switching between the voltage-increasing state and the voltage-decreasing state and can be flexibly applied to power lines of different voltage grades. Meanwhile, when happening on the power transmission lines, short-circuiting faults can be effectively removed in time.

Description

Based on the high voltage DC breaker of Sepic converter topology and the method for excision fault thereof
Technical field
The present invention relates to a kind of high voltage direct current transmission transformation and Protection control system, specifically refer to a kind of based on the novel unidirectional variable-pressure high voltage DC breaker of Sepic converter topology and the cutting method of short trouble thereof.
Background technology
In high-voltage AC transmission system, the normal input of transmission line and accident excision, realized by high-voltage AC breaker.And in HVDC (High Voltage Direct Current) transmission system, then the control that utilizes converter valve to control (grid) pole to eliminate temporary fault or when be short-circuited fault time employing mechanical high-voltage circuit breaker excise, but along with development and the application of VSC-HVDC technology of transmission of electricity, the response time due to mechanical high voltage DC breaker is long is difficult to the quick excision demand meeting short trouble.Therefore, development of new quick high-pressure DC circuit breaker is to impel the development of HVDC (High Voltage Direct Current) transmission system, very necessary.ABB AB have developed the hybrid high voltage DC breaker of First in the world in November, 2012, mechanical kinetics is combined with power electronic equipment, can disconnect the output current of a power large-scale electric generating station within several milliseconds, this makes the efficiently integrated of extensive regenerative resource and exchange and construction new high efficiency electrical network carry out remote distance power transmission becomes possibility.The type of high voltage DC breaker mainly contains mechanical type circuit breaker, solid circuit breaker, hybrid circuit breaker, Z-source circuit breaker and the circuit breaker based on transducer.With high voltage direct current change over switch can only cut-off normal operating current unlike, high voltage DC breaker has the cut-out ability of fault current.
Current mechanical high-voltage DC circuit breaker, can at several ms internal cutting off short circuit current, and the cut-off velocity of this fault current still can not meet the requirement of novel VSC-HVDC transmission system.Solid circuit breaker can overcome the restriction of the speed of cut-offfing easily, but can produce a large amount of loss when steady operation.Hybrid circuit breaker has the dynamic characteristic of the good static characteristic of mechanical chopper and solid circuit breaker thick-less vane concurrently; have that running wastage is low, long service life, reliability are high and the advantage such as good stability; but very high for the manufacture requirements of quick disconnecting link, and switch off time is still subject to the impact of quick disconnecting link and the impact of protection system and call duration time.Except above-mentioned mode of directly cut-offfing short circuit current, it is also conceivable to the mode increasing flow restricter cooperation killer switch electric current, because for the mechanical switch needing blow-out, electric current is larger, blow-out is more difficult; And for the power electronic device without the need to blow-out, turning off the dynamic over-voltage that big current can cause device, current amplitude is larger, and overvoltage is higher.
Summary of the invention
The object of the invention is to solve existing breaker apparatus cost high, response speed is slow, the problems such as equipment running wastage is high, provide a kind of based on the novel unidirectional variable-pressure high voltage DC breaker of Sepic converter topology and the cutting method of short trouble thereof, reach the object that simultaneously can realize realizing in same poower flow direction stepping functions and circuit breaker function.
The present invention is by the following technical solutions to achieve these goals:
Based on a novel unidirectional variable-pressure high voltage DC breaker for Zeta converter topology, comprise circuit breaker and control system,
High voltage DC breaker comprises: comprise the input capacitance C connected between positive input terminal and negative input end i, the positive input terminal of input capacitor and inductance L 1input connects, inductance L 1output and IGBT switch module group S 1input is connected with the anode of intercondenser C, the negative terminal of capacitor C and inductance L 2input be connected with diode cathode, the negative pole of diode and output capacitor C obe connected, IGBT switch module group S 1output, inductance L 2negative terminal, output capacitor C onegative terminal, negative input end are connected and ground connection with negative output terminal;
Control system comprises the outer shroud pi regulator, outer shroud saturation element, inner ring pi regulator, inner ring saturation element, the PWM generator that connect successively, and voltage sensor collects the output end voltage v of high voltage DC breaker o, output end voltage v owith output voltage reference value v after outer shroud low pass filter LPF o *compare and be then input to outer shroud pi regulator, current sensor collects the inductive current i in high voltage DC breaker l, inductive current i lthe inner ring inductive current reference value i exported with outer shroud saturation element after inner ring low pass filter LPF l *compare, the result input inner ring pi regulator compared, also increases and has a pilot controller between described inner ring saturation element and PWM generator.
When novel unidirectional variable-pressure high voltage DC breaker based on Sepic converter topology of the present invention runs conducting state, power switch group S 1conducting, poower flow is through L dccharging, during off-state, L dcthe energy stored is by diode continuousing flow, and operational modal during continuous current mode, at a switch periods T sin, be zero draw equation when disregarding loss by the DC voltage average value of inductance, computational analysis formula is as follows:
At switch mode 1 [0, t on] in, during t=0, power switch group S 1conducting, diode ends.Circuit breaker has three loops under this mode, and first loop is input power, inductance L 1with power switch group S 1the loop of composition, at V iunder effect, inductive current i l1linear growth; Second loop is capacitor C, power switch group S 1and inductance L 2the loop of composition, capacitor C is by power switch group S 1and inductance L 2electric discharge, inductive current i l2increase; 3rd loop is filtering capacitor C othe loop powered to the load, capacitor C ovoltage drop, because of C ocomparatively large, therefore V co=V odecline seldom.Flow through power switch group S 1current i q=i l1+ i l2.Specifically as shown in Figure 5, following two formulas can be obtained according to Kirchoff s voltage theorem:
di L 1 dt = V i L 1
di L 2 dt = V C L 2
At switch mode 2 [t on, T s] in, from t=t onmoment, power switch group S 1turn off, now form two loops.First loop has input power, inductance L 1, capacitor C is through diode D 1to loop, input power and the inductance L of load composition 1energy storage is simultaneously to capacitor C and load feeding, and capacitor C energy storage increases, filtering capacitor C ocharging, and inductive current i l1reduce; Second loop is by inductance L 2through diode D 1with the continuous current circuit of load, inductance L 2energy storage is discharged into load, therefore inductive current i l2decline.Thus the current i of diode dalso be i l1with i l2sum, the therefore current i of diode dalso be inductive current i l1and i l2sum, i.e. i d=i l1+ i l2.Specifically as shown in Figure 6, at this moment two inductive current i l1and i l2rate of descent respectively as shown in following two formulas:
di L 1 dt = V i - V C 1 - V o L 1
di L 2 dt = V o L 2
By acting on L 1upper voltage volt-seconds area equilibrium principle, can obtain:
V it on+V i-V C-V o·t off＝0
Act on L 2on voltage volt-seconds area equilibrium relation be:
V Ct on-V ot off＝0
Can be obtained by various above:
V o V 1 = D 1 - D
As shown from the above formula, the performance of the topology of this improvement similar in appearance to One Buck-Boost converter body, as D=0.5, V o=V i; If D<0.5, then V o<V i; Otherwise, if during D>0.5, then V o>V i.So, the output voltage V of Sepic converter oboth can higher than also can lower than input voltage V i.
Pilot controller carries out zero value detection to duty ratio, when detecting null value, judge malfunction, execution selector switch operates, line disconnection, until failture evacuation, recover normally, zero tester detects that duty ratio is non-vanishing, judge to belong to normal condition, be failure to actuate, so by detection and the adjustment of duty ratio, the function of circuit breaker can be realized, in time short circuit is cut off, that is, this pilot controller can ensure the normal execution of circuit breaker stepping functions when circuit breaker normally runs, and can switch between boosting state and step-down state, can excise timely and effectively short trouble rapidly when transmission line is short-circuited fault again, realize protection high-voltage direct-current transmission system and load equipment.
Described pilot controller comprises zero tester and selector switch, wherein zero tester comprises a zero-crossing comparator and a triggers system, the output signal of inner ring saturation element sends to zero-crossing comparator and triggers system simultaneously, wherein the output signal of zero-crossing comparator is as the condition of triggers system conducting, the output signal of triggers system was entered reverser and was exported selector switch to, and two inputs of selector switch are connected with the output of inner ring saturation element and signal value of zero respectively.Concretely, pilot controller mainly comprises selector switch and zero tester, wherein zero tester is by a zero-crossing comparator and a triggers System's composition, the ON operation condition of triggers system is the output signal of zero-crossing comparator, namely when the output signal of zero-crossing comparator for being greater than zero time, its output signal 1, this step signal makes the conducting of triggers system, exporting pulse makes selector switch carry out action, carries out the excision of line short fault.
A cutting method for variable-pressure high voltage DC breaker short trouble, comprises (a) outer shroud rate-determining steps, (b) inner ring rate-determining steps, (c) auxiliary rate-determining steps.
Wherein (a) inner ring rate-determining steps comprises the following steps:
(a1) voltage sensor collects the output end voltage v of high voltage DC breaker o;
(a2) output end voltage v owith output end voltage reference value v after outer shroud low pass filter LPF o *compare;
(a3) result compared is input to outer shroud pi regulator and outer shroud saturation element regulates, and exports inner ring inductive current reference value i l *.
Wherein (b) inner ring rate-determining steps comprises the following steps:
(b1) current sensor collects the inductive current i in high voltage DC breaker l;
(b2) by this inductive current i lfeedback signal is obtained after filtering out high order harmonic component by low pass filter LPF;
(b3) by feedback signal and output current reference value i l *compare;
(b4) result compared, again through the regulating action of inner ring pi regulator, inner ring saturation element, exports circuit breaker duty ratio D;
(b5) the output signal D that step (b4) obtains is modulated through PWM generator, control high voltage DC breaker and realize transformation and failure removal function.
Wherein (c) auxiliary rate-determining steps comprises the following steps:
(c1) when HVDC (High Voltage Direct Current) transmission system is normally run, duty ratio D keeps a stationary value, and selector switch connects inner ring saturation element input;
(c2) when HVDC (High Voltage Direct Current) transmission line short trouble occurs, duty ratio D drops to zero fast by stationary value;
(c3) zero-crossing comparator compares output valve is 1, triggers system ON operation;
(c4) in the moment of input d value vanishing, export from 0 to 1 band rising edge step signal, then through reverser, triggers system exports the band trailing edge step signal for having carved at that of D value vanishing from 1 to 0;
(c5) after selector switch receives the trailing edge step signal of reverser input, be switched to lower end position from position, upper end and be connected the zero setting of D value with signal value of zero and keep, until fault is completely isolated and remove.
The cutting method of a kind of variable-pressure high voltage DC breaker of the present invention short trouble, adopt and increase an auxiliary step controlling to export circuit breaker duty ratio D in double loop control, thus the short trouble status monitoring of HVDC (High Voltage Direct Current) transmission line can be realized, when hvdc transmission line is in short-circuit condition, export the duty ratio of circuit breaker to change thus reflect transmission line and to be short-circuited fault, thus realize line disconnection, play the object of protection, for existing high voltage DC breaker, there is transformation function, reaction at a high speed, quick execution, the cut-out response time only needs about 4ms, relative to mechanical type and hybrid high voltage DC breaker being very short time, there is larger advantage, when not using other demand limiters, fault curre is limited in a very safe scope, after fault is cut, by resetting pilot controller, control system can be made to return to normal operating state.The output end voltage v of outer shroud regulable control circuit breaker o: voltage sensor collects high voltage DC breaker output end voltage v o, filter out the feedback signal after high order harmonic component and output voltage reference value v by outer shroud low pass filter LPF o *compare, then export the reference value i of inner ring inductive current regulable control through pi regulator adjustment and saturation element effect l *, computing formula is as follows:
i L * = K pv ( v 0 * - v o ) + K iv &Integral; ( v o * - v o ) dt
K pvthe proportional control factor of outer shroud pi regulator, K ivit is the integral adjustment coefficient of outer shroud pi regulator; Inner ring regulable control inductive current i l: current sensor collects inductive current i in high voltage DC breaker l, filter out the feedback signal after high order harmonic component and output voltage reference value i by inner ring low pass filter LPF l *compare, then regulate and saturation element effect output circuit breaker duty ratio D through pi regulator, calculate such as formula as follows:
D = K pi ( i L * - i L ) + K ii &Integral; ( i L * - i L ) dt
K pithe proportional control factor of inner ring pi regulator, K iiit is the integral adjustment coefficient of inner ring pi regulator; In order to solve problem undesirable in traditional double closed loop control method, the present invention adopts and carries out zero value detection to control to duty ratio: when an error occurs, due to the regulating action of two close cycles, D is declined very soon by original stationary value and reduces to zero, now zero tester detects and just sends a pulse to two-terminal switch, and two-terminal switch accepts trigger the zero setting of D value and keep, until fault is completely isolated and remove, this pulse signal lost efficacy, and double-closed-loop control device recovers normal and runs.
The present invention compared with prior art, has following advantage and beneficial effect:
1, a kind of novel unidirectional variable-pressure high voltage DC breaker based on Sepic converter topology of the present invention, on device structure, only have employed two IGBT switch module groups, relative to the topology of other multiple IGBT switch module groups, on the basis realizing equipment stepping functions and circuit breaker function, greatly reduce equipment cost, reduce equipment running wastage.Because the IGBT switch module group of this high voltage DC breaker needs how expensive IGBT unit strings to be very formed in parallel, and the dominant loss of this equipment comes from switching loss and the conduction loss of IGBT;
2, present invention achieves compared to the more function of conventional high-tension circuit breaker.The stepping functions of circuit breaker can be realized when HVDC (High Voltage Direct Current) transmission system is normally run; also can realize excising timely and effectively short trouble rapidly when transmission line is short-circuited fault, realize protection high-voltage direct-current transmission system and load equipment.
Accompanying drawing explanation
Fig. 1 is the block diagram of Control and protection system of the present invention;
Fig. 2 is the topological diagram of the high voltage DC breaker that the present invention is based on Sepic converter topology;
Fig. 3 is the topological diagram local A enlarged drawing of the high voltage DC breaker that the present invention is based on Sepic converter topology;
Fig. 4 is the topological diagram local B enlarged drawing of the high voltage DC breaker that the present invention is based on Sepic converter topology;
Fig. 5 is the operation logic figure of the high voltage DC breaker conducting phase that the present invention is based on Sepic converter topology;
Fig. 6 is the operation logic figure of the high voltage DC breaker off-phases that the present invention is based on Sepic converter topology;
Fig. 7 is the work wave of the high voltage DC breaker based on Sepic converter;
Fig. 8 is short circuit failure removal high pressure simulation result figure in step-down of the present invention;
Fig. 9 is short circuit failure removal high pressure simulation result figure during the present invention is boosted;
Figure 10 is the low-pressure experiment the result figure that step-down short trouble of the present invention excision high pressure simulation result is corresponding;
Figure 11 is the low pressure simulation result figure that Figure 10 is corresponding;
Figure 12 is that the present invention is boosted low-pressure experiment the result figure corresponding to short trouble excision high pressure simulation result;
Figure 13 is the low pressure simulation result figure that Figure 12 is corresponding.
Embodiment
Below in conjunction with embodiment, the present invention is described in further detail, but embodiments of the present invention are not limited thereto.
Embodiment
As shown in Figure 1, a kind of novel unidirectional variable-pressure high voltage DC breaker based on Sepic converter topology, circuit breaker comprises the input capacitance C of connection just between input and negative input end i, the positive input terminal of input capacitor and inductance L 1connect, L 1output and IGBT switch module group S 1be connected with the anode of intercondenser C, the negative terminal of capacitor C and inductance L 2input be connected with diode cathode, the negative pole of diode and output capacitor C obe connected.IGBT switch module group S 1output, inductance L 2negative terminal and output capacitor C othe ground connection while of negative terminal and negative input end, negative output terminal, concrete connection as shown in Figure 2, IGBT switch module group in Fig. 2 is formed by multiple IGBT module connection in series-parallel, partial enlarged drawing as shown in Figure 3, diode (led) module group in Fig. 2 is formed by multiple diode (led) module connection in series-parallel, and partial enlarged drawing as shown in Figure 4; Control system comprises the outer shroud pi regulator, outer shroud saturation element, inner ring pi regulator, inner ring saturation element, PWM generator and the high voltage DC breaker that connect successively, and voltage sensor collects the output end voltage v of high voltage DC breaker o, output end voltage v owith output voltage reference value v after outer shroud low pass filter LPF o *compare and be then input to outer shroud pi regulator, current sensor collects the inductive current i in high voltage DC breaker l, inductive current i lthe inner ring inductive current reference value i exported with outer shroud saturation element after inner ring low pass filter LPF l *compare, the result input inner ring pi regulator compared, also increases and has a pilot controller between described inner ring saturation element and PWM generator, when running conducting state, and power switch group S 1conducting, poower flow is through L dccharging, during off-state, L dcthe energy stored passes through diode continuousing flow.
High voltage DC breaker of the present invention is applied to
The primary cut-out operation logic figure of this invention as shown in Figs. 5 to 7 and working waveform figure, L dcchoosing of value considers that circuit breaker is operated in continuous mode, inductive current ripple coefficient 5%, choosing of output capacitance considers that output voltage ripple coefficient is 10% under converter rated operation, the impedance of transmission line is also considered among test, line impedance value chooses the transmission line of 200km in MTDC transmission system, impedance is pressed 0.11155mH/km and 0.014 Ω/km and is calculated, and in emulation testing, 3 Ω and 20mH are elected in line resistance and reactance respectively as.
Fig. 8 and Fig. 9 is short trouble of the present invention excision high pressure simulation result figure, and wherein Fig. 8 is step-down simulation result, and Fig. 9 is boosting simulation result.As can be seen from Figure 8, output end voltage drops to 100kV by 200kV, when after output voltage stabilization, in the 0.6s moment, add a short trouble, the quick vanishing of output end voltage now, fault current raises fast, this duty ratio D also drops to zero fast under the effect of control system, thus reaches shutoff IGBT switch module group switch, realizes the object of isolated fault.The result of same excision short trouble as can be seen from Figure 9.Circuit breaker topology of the present invention can realize boosting also can realize buck functionality, when circuit breaker failure occurs, can be excised by short trouble effectively fast.And this invention circuit breaker topology can also switch between boosting state and transformation state, reaches the object of power supply flexibly.
Figure 10 and Figure 12 is the low-pressure experiment the result figure that short trouble of the present invention excision high pressure simulation result is corresponding, experimental result when wherein Figure 10 is step-down, experimental result when Figure 12 is boosting.As can be seen from the figure, high-voltage direct-current breaker topology of the present invention can realize transformation function, also achieves short trouble excision function well.Figure 11 with Figure 13 is the corresponding low voltage low power simulation result of Figure 10 with Figure 12 respectively, and as can be seen from Fig., their waveform is very consistent, and this also demonstrates the validity of transformation function and circuit breaker function in high pressure simulation result better.
The above is only preferred embodiment of the present invention, not does any pro forma restriction to the present invention, every according in technical spirit of the present invention to any simple modification, equivalent variations that above embodiment is done, all fall within protection scope of the present invention.

Claims (4)

1., based on a novel unidirectional variable-pressure high voltage DC breaker for Sepic converter topology, comprise high voltage DC breaker and control system,
High voltage DC breaker comprises: comprise the input capacitance C connected between positive input terminal and negative input end i, the positive input terminal of input capacitor and inductance L 1input connects, inductance L 1output and IGBT switch module group S 1input is all connected with the anode of intercondenser C, the negative terminal of intercondenser C and inductance L 2input be connected with diode cathode, the negative pole of diode and output capacitor C obe connected, IGBT switch module group S 1output, inductance L 2output, output capacitor C onegative terminal, negative input end are connected and ground connection with negative output terminal;
Control system comprises: the outer shroud pi regulator connected successively, outer shroud saturation element, inner ring pi regulator, inner ring saturation element, PWM generator, also comprises outer shroud low pass filter LPF and inner ring low pass filter LPF;
High voltage DC breaker positive output end voltage v owith output voltage reference value after outer shroud low pass filter LPF outer shroud pi regulator is input to after comparing;
Inductive current i in high voltage DC breaker lthe inner ring inductive current reference value exported with outer shroud saturation element after inner ring low pass filter LPF compare, the result input inner ring pi regulator compared;
A pilot controller is also provided with between described inner ring saturation element and PWM generator.
2. a kind of novel unidirectional variable-pressure high voltage DC breaker based on Sepic converter topology according to claim 1, it is characterized in that: described pilot controller comprises zero tester and selector switch, zero tester comprises zero-crossing comparator and triggers system, the output signal of inner ring saturation element sends to zero-crossing comparator and triggers system simultaneously, the output signal of zero-crossing comparator is as the condition of triggers system conducting, the output signal of triggers system exports selector switch to through reverser, two inputs of selector switch are connected with the output of inner ring saturation element and the signal value of zero of pilot controller respectively, output is connected with PWM generator.
3. a kind of novel unidirectional variable-pressure high voltage DC breaker based on Sepic converter topology according to claim 2, it is characterized in that: pilot controller carries out zero value detection to duty ratio, when detecting null value, judging malfunction, performing selector switch operation, line disconnection, until failture evacuation, recover normally, zero tester detects that duty ratio is non-vanishing, judge to belong to normal condition, be failure to actuate.
4., according to a cutting method for the short trouble of the arbitrary described a kind of novel unidirectional variable-pressure high voltage DC breaker based on Sepic converter topology of 1-4, comprise outer shroud rate-determining steps, inner ring rate-determining steps, auxiliary rate-determining steps;
Its outer-loop rate-determining steps comprises the following steps:
(a1) voltage sensor gathers the positive output end voltage v of high voltage DC breaker o;
(a2) positive output end voltage v owith output end voltage reference value after outer shroud low pass filter LPF compare;
(a3) result compared is input to outer shroud pi regulator and outer shroud saturation element regulates, and outer shroud saturation element exports inner ring inductive current reference value
Wherein inner ring rate-determining steps comprises the following steps:
(b1) current sensor gathers the inductive current i in high voltage DC breaker l;
(b2) by this inductive current i lfeedback signal is obtained after filtering out high order harmonic component by low pass filter LPF;
(b3) by feedback signal and output current reference value compare;
(b4) result compared, again through the regulating action of inner ring pi regulator, inner ring saturation element, exports circuit breaker duty ratio D;
(b5) the output signal duty ratio D that step (b4) obtains is modulated through PWM generator, control high voltage DC breaker and realize transformation and failure removal function;
Wherein auxiliary rate-determining steps comprises the following steps:
(c1) when HVDC (High Voltage Direct Current) transmission system is normally run, duty ratio D keeps a stationary value, and selector switch connects inner ring saturation element input;
(c2) when HVDC (High Voltage Direct Current) transmission line short trouble occurs, duty ratio D drops to zero fast by stationary value;
(c3) zero-crossing comparator compares output valve is 1, triggers system ON operation;
(c4) in the moment of input duty cycle D value vanishing, export from 0 to 1 band rising edge step signal, then through reverser, triggers system exports the band trailing edge step signal for having carved at that of duty ratio D value vanishing from 1 to 0;
(c5) after selector switch receives the trailing edge step signal of reverser input, be switched to lower end position from position, upper end and be connected the zero setting of duty ratio D value with signal value of zero and keep, until fault is completely isolated and remove.
CN201510176341.9A 2015-04-15 2015-04-15 High-voltage direct-current breaker based on Sepic converter topology and fault removal method thereof Pending CN104767187A (en)

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106486980A (en) * 2016-12-02 2017-03-08 国网四川省电力公司成都供电公司 A kind of unidirectional variable-pressure HVDC tripper and failure removal method
CN109638791A (en) * 2018-11-09 2019-04-16 华北电力大学 A kind of direct current thread-breakage protecting of multiterminal flexible direct current distribution system
CN112332550A (en) * 2020-10-21 2021-02-05 华北电力大学 Passive energy-taking device for input and output of transformer neutral line width range

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH07255132A (en) * 1994-03-14 1995-10-03 Toshiba Corp Inverter for system interconnection
CN103928918A (en) * 2014-05-05 2014-07-16 西南交通大学 Removing system and method for transformation type high-voltage direct-current breaker short-circuit fault
CN104300516A (en) * 2014-05-05 2015-01-21 西南交通大学 Unidirectional transformation-type high-voltage DC circuit breaker based on Buck convertor
CN104300517A (en) * 2014-05-05 2015-01-21 西南交通大学 Unidirectional transformation-type high-voltage DC circuit breaker based on Buck-Boost convertor

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH07255132A (en) * 1994-03-14 1995-10-03 Toshiba Corp Inverter for system interconnection
CN103928918A (en) * 2014-05-05 2014-07-16 西南交通大学 Removing system and method for transformation type high-voltage direct-current breaker short-circuit fault
CN104300516A (en) * 2014-05-05 2015-01-21 西南交通大学 Unidirectional transformation-type high-voltage DC circuit breaker based on Buck convertor
CN104300517A (en) * 2014-05-05 2015-01-21 西南交通大学 Unidirectional transformation-type high-voltage DC circuit breaker based on Buck-Boost convertor

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
陈勇奇: "基于RMC的海上风电并联多端高压直流输电研究", 《中国优秀硕士学位论文全文数据库 工程科技Ⅱ辑（月刊）》 *

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106486980A (en) * 2016-12-02 2017-03-08 国网四川省电力公司成都供电公司 A kind of unidirectional variable-pressure HVDC tripper and failure removal method
CN109638791A (en) * 2018-11-09 2019-04-16 华北电力大学 A kind of direct current thread-breakage protecting of multiterminal flexible direct current distribution system
CN109638791B (en) * 2018-11-09 2020-02-18 华北电力大学 Direct-current disconnection protection method of multi-terminal flexible direct-current power distribution system
CN112332550A (en) * 2020-10-21 2021-02-05 华北电力大学 Passive energy-taking device for input and output of transformer neutral line width range

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Application publication date: 20150708