CN110571778A - Earth fault current compensation system and method for self-generating power phase power supply - Google Patents

Earth fault current compensation system and method for self-generating power phase power supply Download PDF

Info

Publication number
CN110571778A
CN110571778A CN201910992110.3A CN201910992110A CN110571778A CN 110571778 A CN110571778 A CN 110571778A CN 201910992110 A CN201910992110 A CN 201910992110A CN 110571778 A CN110571778 A CN 110571778A
Authority
CN
China
Prior art keywords
power supply
phase
phase power
switch
ground fault
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN201910992110.3A
Other languages
Chinese (zh)
Inventor
刘红文
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Electric Power Research Institute of Yunnan Power System Ltd
Original Assignee
Electric Power Research Institute of Yunnan Power System Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Electric Power Research Institute of Yunnan Power System Ltd filed Critical Electric Power Research Institute of Yunnan Power System Ltd
Priority to CN201910992110.3A priority Critical patent/CN110571778A/en
Publication of CN110571778A publication Critical patent/CN110571778A/en
Pending legal-status Critical Current

Links

Classifications

    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02HEMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H9/00Emergency protective circuit arrangements for limiting excess current or voltage without disconnection
    • H02H9/04Emergency protective circuit arrangements for limiting excess current or voltage without disconnection responsive to excess voltage
    • H02H9/045Emergency protective circuit arrangements for limiting excess current or voltage without disconnection responsive to excess voltage adapted to a particular application and not provided for elsewhere
    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02HEMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H9/00Emergency protective circuit arrangements for limiting excess current or voltage without disconnection
    • H02H9/08Limitation or suppression of earth fault currents, e.g. Petersen coil

Abstract

the invention discloses a ground fault current compensation system and method for a self-generated power phase power supply, which comprises a phase power supply converter, a fling-cut switch, a transformation device and a controller, wherein the input end of the phase power supply converter is connected with a bus, the output end of the phase power supply converter is connected with the input end of the fling-cut switch, the transformation device is connected between the phase power supply converter and a system neutral point in series, the controller is connected with a voltage transformer of the bus, and the output end of the controller is connected with the input end of the fling-cut switch. The system can passively generate a power supply phase power supply and a harmonic phase power supply of the power distribution network, and the reverse phase power supply and the harmonic phase power supply are put into the system according to fault logic, so that the complete compensation of the ground fault reactive current and the harmonic current of the power distribution network is realized, the defect of incomplete compensation by adopting a power electronic device inversion injection method after power is taken from a bus system is overcome, and the problems that the metal grounding compensation effect of an active inversion method is poor and the traditional arc suppression coil cannot realize full compensation are solved.

Description

Earth fault current compensation system and method for self-generating power phase power supply
Technical Field
the invention relates to the technical field of power distribution networks, in particular to a system and a method for compensating earth fault current of a self-generated power phase power supply.
Background
The single-phase earth fault of the power distribution network at home and abroad accounts for more than 80 percent, the safe operation of the power grid and equipment is seriously influenced, and the safe processing of the earth fault plays an important role in social and economic development. When the capacitance current of the system is more than 10A, an arc suppression coil grounding mode is adopted. The arc suppression coil can reduce the fault current to a certain extent, and the system can take the trouble to operate for 2 hours, but the arc suppression coil can not realize full compensation, and the fault point still has the residual current that is less than 10A, and the existence of residual current can cause the person to electrocute, the conflagration accident to and threaten the safe and stable operation of electric wire netting and equipment seriously. When the capacitance current of the system is large, a small-resistance grounding mode is mostly adopted, when a single-phase grounding fault occurs, the zero sequence current of the fault line is amplified, and the relay protection device quickly cuts off the fault line.
Currently, in order to be able to thoroughly eliminate the single-phase earth fault hazard, the reliability of power supply is guaranteed simultaneously. Various methods for completely compensating the current of the single-phase earth fault point are proposed at home and abroad.
Swidishneneutral, sweden, published "full compensation technology application for earth fault neutralizers" discloses a method for compensating earth fault point current by injecting current into a system neutral point through an active compensator. However, the residual current of the ground fault in the method can not be directly obtained, and the residual current value is calculated by adopting the distribution parameters of the system to the ground, so that the deviation is large; meanwhile, the compensator adopts a power electronic device to realize the control of current phase and amplitude, the accuracy of the current phase and the amplitude cannot be simultaneously ensured, the harmonic content of the compensation current is large, the control is complex, and the stability is poor; therefore, the compensation effect of the GFN (ground fault neutralizer) manufactured by swedish neutral in sweden deviates greatly from the ideal value, and the result of a simulation test performed by the device at a place in the zhejiang (Zhejiang power 2018, a fault line selection field test research based on a neutral point full compensation technology) shows that for a metallic ground fault, the ground residual current compensated by the GFN device is still above 5A, has a large difference from the ideal value, namely zero current, and is only equivalent to the compensation effect of an arc suppression coil.
Domestically, patent CN102074950A discloses a method for extinguishing and protecting the arc of a ground fault of a power distribution network, which is similar to the arc extinguishing method of swedish neutral, sweden. The method only has the effect on high-resistance grounding faults, controls the fault phase voltage, needs to accurately control the amplitude and the phase of the injected current, and is difficult to realize.
The patent with application number 201710550400.3 discloses an active voltage reduction safety processing method for ground fault of non-effective grounding system, which is to set a tap joint on the side winding of the transformer system, and reduce the voltage of fault phase by short-circuiting the tap joint of the fault phase winding to ground or via impedance, so as to achieve the purpose of limiting the current of the ground fault point. Essentially, when a power grid line is subjected to single-phase grounding, another grounding point is manufactured on the side of a system bus to shunt the original single-phase grounding current, obviously, the method has poor or even ineffective compensation effect on metallic single-phase grounding faults, and the inter-phase short circuit is caused by the misoperation of the device.
The patent application numbers 201710544978.8 and 201710544976.9 disclose phase-down arc suppression methods for an ineffective grounding system ground fault, and both methods apply power between a bus and ground, or a line and ground, or a neutral point and ground, or a tap of a neutral point ineffective grounding system side winding and ground when a single-phase ground fault occurs, so as to reduce the fault voltage. The difference between the two methods is that one of the external power supplies is a voltage source, and the other external power supply is a current source, so that the two methods have no essential difference. The method also has the problems of the phase voltage precision of a control system of a voltage source and a current source and the problem of incapability of controlling the control system when the relative ground voltage is zero in the case of metallic short circuit. In both methods, when an external power source is applied directly between the bus or line and ground, the system line voltage is changed, and the system load (such as a distribution transformer) cannot operate normally.
In summary, in the prior art, there is no technology for fully compensating the single-phase earth fault current, which is simple, convenient, accurate and efficient to control, and can give consideration to both the reliability and the safety of the power supply of the power distribution system.
Disclosure of Invention
in view of the above, an object of the present invention is to provide a ground fault current compensation system and method for generating a power phase power source by itself, wherein the line power source on a bus is changed into a reverse phase power source through a line phase converter, and a neutral point of a switching switch access system is combined to access an overvoltage of a fault phase to suppress the fault phase, so as to achieve a full compensation purpose, thereby effectively solving the problems of complex current control, difficult complete compensation of metallic grounding, and the like in a single-phase ground fault of a power distribution system.
The invention solves the technical problems by the following technical means:
The invention provides a ground fault current compensation system for self-generating a phase power supply, which comprises a phase power supply converter, a switching switch, a voltage transformation device and a controller. The transformer device is a compensation capacitor bank (a reactor bank) or a series capacitor bank (a series reactor bank) or a voltage regulator. The voltage regulator can be any combination of a compensation capacitor bank, a series capacitor bank and a voltage regulator. The input end of the phase power supply converter is connected with the bus, the output end of the phase power supply converter is connected with the input end of the fling-cut switch, the fling-cut switch is connected to a system neutral point, a voltage transformer of the bus is connected with the input end of the controller, and the output end of the controller is connected with the input end of the fling-cut switch.
further, the phase power supply converter is a transformer of a Yyn6 connection group three-phase three-limb iron core structure, and is used for converting line voltage of a system bus into phase voltage and generating a power supply phase power supply. The switching switches are respectively provided with switch connection points of an A phase, a B phase and a C phase and a common connection point; the switching switch can be a mechanical switch, a power electronic switch and other quick switching switches. The primary side of the phase power supply transformer is connected with a three-phase bus of a power grid system, the secondary side of the phase power supply transformer is connected with connection points of an A phase, a B phase and a C phase of the fling-cut switch, and a neutral point of the secondary side of the phase power supply transformer is grounded.
further, the voltage transformation device is used for adjusting the drop voltage generated by the loss of the system.
furthermore, the technology provides 3 different implementation modes for realizing voltage transformation, and the implementation can be selected at will. The voltage regulator is a compensation capacitor bank (reactor bank), a series capacitor bank (series reactor bank) or a voltage regulator.
Further, when the transformer device is a compensation capacitor bank (reactor bank),
the compensation capacitor bank is a group of capacitor banks which are connected in a triangular mode and connected to the secondary winding three-phase output end of the phase compensator of the phase power supply, the compensation capacitor bank is connected in a triangular mode, and the leading-out ends of the compensation capacitor bank are respectively connected with the phase compensation connection point A, the phase compensation connection point B and the phase compensation connection point C on the secondary side of the phase compensator of the phase power supply.
The capacitor capacity of each phase of the parallel voltage-regulating capacitor bank can be calculated as follows:
c is a series regulating capacitor, omega is the angular frequency of the power grid system, ZLAnd equivalent leakage reactance for the phase power supply generator and the phase power supply phase adjuster.
Further, when the transformer device is a series capacitor bank (series reactor bank):
The series regulating capacitor is connected in series between a common connection point of the fling-cut switch and a neutral point of a power grid system, the common connection point of the fling-cut switch is connected to one end of a primary winding of the series capacitor bank, and the other end of the primary winding of the series capacitor bank is grounded. One end of a secondary winding of the series capacitor bank is connected with a system neutral point, and the other end of the secondary winding is grounded.
The capacitance can be calculated as follows:
Wherein, CFor series regulation of capacitors, omega is the angular frequency of the grid system, ZLAnd equivalent leakage reactance for the phase power supply generator and the phase power supply phase adjuster.
further, when the voltage transformation device is a voltage regulator, the common connection point of the fling-cut switch is connected to one end of a primary winding of the voltage regulator, the other end of the primary winding of the voltage regulator is grounded, one end of a secondary winding of the voltage regulator is connected with a system neutral point, and the other end of the secondary side of the voltage regulator is grounded. The voltage regulator is connected between the common connection point of the switching switch and the neutral point of the power grid system in series, and the voltage regulator is used for compensating the voltage input to the neutral point of the system to enable the voltage amplitude of the neutral point to be equal to the voltage amplitude of the system power supply phase. The voltage transformation device can be any combination of a compensation capacitor bank, a series capacitor bank and a voltage regulator. The voltage transformation device can be any combination of a compensation capacitor bank, a series capacitor bank and a voltage regulator.
Further, the controller mainly comprises a fault judgment module and a switch control module.
And the fault judgment module judges whether the system is in single-phase grounding or not and judges a grounding phase according to the zero-sequence voltage, the three-phase voltage, the zero-sequence current of the line and the like of the system. And the switch control module controls the corresponding switch of the fling-cut switch to be closed according to the grounding phase judged by the fault occurrence judgment module.
further, the phase power supply converter adopts a transformer of a three-phase three-limb iron core structure connected with Yyn6 to provide energy for the compensation system.
Further, the ground fault current compensation method of the self-generating power supply provided by the invention is specifically executed according to the following steps:
S1, judging whether the system is in single-phase grounding or not and judging the grounding phase through the controller;
s2, when a certain phase has a ground fault, the controller controls the fling-cut switch to close the phase switch corresponding to the fault;
S3, voltage compensation is carried out through a voltage transformation device;
S4, when the on-off time of the fling-cut switch reaches the set time, the controller controls the fling-cut switch to be switched off;
S5, the controller continuously judges whether the single-phase earth fault exists;
and S6, if the ground fault still exists, jumping to the step 2, and if the single-phase ground does not exist, ending the single-phase ground compensation process.
Further, the off time of the fling-cut switch set in the step S4 is set according to the line condition, for example, the off time is set according to the condition that there are many ground faults of the line tree fault or other conditions that easily cause many ground faults.
The invention provides a phase power supply for converting line voltage which is not changed before and after a single-phase grounding in a system into a system power supply through a phase power supply converter for compensating active power and reactive power formed by impedance to ground when the system is grounded in a single phase. The purpose of complete compensation is achieved, wherein the voltage and the current of the single-phase grounding fault point are both suppressed to be zero. Under the condition of single-phase earth fault, the system can be operated in a live-line mode, and the single-phase earth fault point has no electric shock risk and arcing risk; and the method provided by the invention only controls the on-off of the switch, thereby greatly simplifying the control method of the single-phase earth fault full-compensation technology.
The invention has the beneficial effects that:
(1) According to the technical scheme provided by the invention, the power supply with the phase voltage opposite to that of the power supply of the system and the same amplitude is obtained from the system through the passive element, the single-phase earth fault point current can be completely compensated, the earth arc is eliminated, the power supply reliability of a power grid system is ensured, and the personal electric shock risk is avoided. The power grid system can continuously supply power, and the power supply safety is improved.
The compensation system provided by the invention can obtain an element with a phase opposite to a phase voltage of a power supply of a system fault phase by using a passive element, does not need phase adjustment, and only needs to adjust a voltage amplitude value and switch a corresponding switch. Compared with the existing active full compensation technology based on the power electronic inversion technology, the active full compensation technology has the advantages that even if the system voltage fluctuates, the voltage and the phase do not need to be adjusted, the compensation precision is higher, the control mode is simpler, and the active full compensation technology has incomparable technical advantages.
(2) In the technical scheme provided by the invention, the elements which can stably run for a long time such as a transformer, a voltage regulator, a capacitor, a switch and the like which are mature in the prior art are adopted, and the stability is obviously superior to that of an easily damaged power electronic device; compared with the power electronic inverter power supply with complex maintenance, the elements adopted by the technical scheme are all common and mature elements of the power system which are easy to maintain and even free from maintenance; the technical scheme adopts mature element technology and has low cost; therefore, compared with the existing power electronic active full compensation technology, the technical scheme has the advantages of low hardware cost, low research and development cost and low maintenance cost, and is high in stability and low in maintenance cost.
drawings
FIG. 1 is a schematic diagram of a self-generated power supply type ground fault compensation system according to the present invention;
Fig. 2 is a schematic diagram of a compensation voltage structure of a series capacitor bank of a self-generating power supply type ground fault compensation system according to the present invention;
Fig. 3 is a schematic diagram of a compensation voltage structure of a compensation capacitor bank of the self-generated power supply type ground fault compensation system according to the present invention;
Fig. 4 is a schematic diagram of a voltage regulator compensation voltage structure of a self-generated power supply type ground fault compensation system according to the present invention;
FIG. 5 is a zero sequence value circuit diagram of a dual winding transformer;
FIG. 6 is a schematic diagram of three single-phase grouped and zero-sequence excitation flux paths;
Fig. 7 is a schematic diagram of a three-phase five-limb transformer core structure and a zero-sequence excitation flux path;
fig. 8 is a schematic diagram of a three-phase three-limb transformer core structure and a zero-sequence excitation flux path;
Fig. 9 is a flowchart of a self-generated power supply type ground fault compensation method according to the present invention.
Detailed Description
The present invention will be described in detail with reference to the drawings and specific embodiments, and it is to be understood that the described embodiments are only a few embodiments of the present invention, rather than the entire embodiments, and that all other embodiments obtained by those skilled in the art based on the embodiments in the present application without inventive work fall within the scope of the present application.
Referring to fig. 1, a system and method for compensating a ground fault current of a self-generated phase power supply according to the present invention is shown in fig. 1.
In this embodiment, referring to fig. 2-4, an exemplary embodiment is given; the device comprises a phase power supply converter 1, a fling-cut switch 2, a transformer device 3 and a controller 4.
The phase power supply converter 1 is a Yyn6 transformer, is connected to a bus, converts the bus voltage into phase voltage, and the fling-cut switch 2 is connected to the phase power supply generator 1 and controls fling-cut through the controller 4.
in this embodiment, the voltages of the system bus lines are respectivelyThe system bus side phase voltages are respectively The line voltages output by the phase power supply converter 1 are respectivelyPhase voltages are respectivelyfor the transformers in the Yyn6 connection group, the homonymous terminals of the primary and secondary side windings are opposite, and the phase of line voltages is different by 180 degrees, namely:
the ratio of the voltages of the primary and secondary windings of the phase power supply converter 1 is k, and k may be any value, but k is 1 is the simplest for implementing the system, so in this embodiment, k is 1, and therefore the line voltage amplitudes have the following relationship:
Further obtaining the system bus side phase voltageAfter passing through the phase power supply converter 1 The phases are opposite, as shown in equation 3:
In this embodiment, the bus line voltageafter passing through the phase supply converter 1Opposite in phase, so that the system bus side phase voltageAfter passing through the phase power supply converter 1 the phases are opposite. If the system generates A-phase single-phase grounding, the A-phase switch of the fling-cut switch 2 is closed,The voltage injected to the neutral point through the transformer 3 is voltageAndthe amplitudes are the same and the phases are opposite. Therefore, the system grounding phase voltage is zero and the grounding point current is also zero, so that the aims of completely compensating the grounding current and ensuring the power supply reliability and safety are fulfilled.
In this embodiment, refer to fig. 5, which is a zero-sequence equivalent circuit diagram of a transformer without counting winding resistance and core loss. In the figure, I is the primary side of the transformer, II is the secondary side of the transformer, Xis a primary winding reactance, XFor converting the secondary winding to an equivalent reactance, X, of the primary sidem0is a zero sequence excitation reactance. When the phase A of the system bus is grounded, the Yyn 6-connected transformer adopted by the invention is equivalent to the grounding short circuit of the phase A winding of the transformer. According to the transformer principle, the core excitation current is controlled by a zero sequence excitation reactance, which is closely related to the core structure of the transformer.
In this embodiment, referring to fig. 6 and 7, for example, the phase power supply converter is a transformer with a three-phase five-limb type and three single-phase group-type core structures, and the zero-sequence excitation magnetic flux path thereof is as shown in fig. 6 and 7. WhereinIs a zero-sequence current, and is a zero-sequence current,is a zero sequence excitation flux. For a three-phase transformer group consisting of three single-phase transformers, the zero-sequence main magnetic flux of each phase is the same as the positive-sequence main magnetic flux, and an independent iron core magnetic circuit is arranged, so that the zero-sequence excitation reactance is equal to the positive-sequence excitation reactance. For a three-phase five-column transformer, zero-sequence magnetic flux can also form a loop in an iron core, and the magnetic resistance is very small, so that the value of zero-sequence excitation reactance is very large.
When the A phase is short-circuited, its zero-sequence excitation reactance X ism0Infinity, i.e. neglecting the exciting current, shunting the exciting currentAnd the circuit is disconnected, so that no energy is output to the compensation system from the secondary side of the phase power supply converter. Therefore, it cannot be used as a phase power supply converter.
in this embodiment, referring to fig. 8, the phase power supply converter is a transformer with a three-phase three-limb iron core structure, and a zero-sequence excitation flux path thereof is shown in the figure.
For a three-phase three-limb transformer, three-phase zero-sequence magnetic fluxes have equal magnitude and same phase, so that one-phase main magnetic flux can not form a loop through iron cores of the other two phases like a positive-sequence (or negative-sequence) main magnetic flux. They are forced to loop through the insulating medium and the housing, encountering significant magnetic reluctance. Therefore, the zero-sequence excitation reactance of the three-phase three-limb transformer is much smaller than the positive-sequence excitation reactance, and when the A-phase is in short circuit, the zero-sequence excitation reactance has a finite value, about Xm0The value is 0.3-1.0, which can be adjusted according to the design. Therefore, the transformer with the three-phase three-limb iron core structure can be used as a phase power supply converter to compensate the system ground fault current.
In summary, when the phase power supply converter is a transformer in Yyn6 connection group, the iron core structure can only be three-phase three-limb type, and a five-limb type with independent magnetic circuits and a three-phase transformer group consisting of three single-phase transformers are not suitable.
although the present invention has been described in detail with reference to the preferred embodiments, it will be understood by those skilled in the art that various changes may be made and equivalents may be substituted without departing from the spirit and scope of the invention as defined in the appended claims. The techniques, shapes, and configurations not described in detail in the present invention are all known techniques.

Claims (9)

1. The utility model provides a ground fault current compensating system from production power supply phase power, its characterized in that, includes phase power supply converter (1), on-off switch (2) and controller (4), the input and the bus connection of phase power supply converter (1), the output is connected with on-off switch's (2) input, on-off switch (2) access system neutral point, the voltage transformer of bus is connected with the input of controller (4), the output of controller (4) is connected with on-off switch's (2) input.
2. A ground fault current compensation system for a self-generated phase power supply as claimed in claim 1, wherein: the ground fault current compensation system for the self-generated phase power supply further comprises a voltage transformation device (3).
3. a ground fault current compensation system for a self-generated phase power supply as claimed in claim 2, wherein: the transformer device (3) is a compensation capacitor bank or a reactor bank (31), and the compensation capacitor bank or the reactor bank (31) is in triangular or star connection with the phase power supply converter (1).
4. A ground fault current compensation system for a self-generated phase power supply as claimed in claim 2, wherein: the transformer device (3) is a series capacitor bank or a series reactor bank (32), and the series capacitor bank or the series reactor bank (32) is connected in series between the fling-cut switch (2) and a system neutral point.
5. A ground fault current compensation system for a self-generated phase power supply as claimed in claim 2, wherein: the voltage transformation device (3) is a voltage regulator (33), and the voltage regulator (33) is connected between the switching switch (2) and a system neutral point in series.
6. a ground fault current compensation system for a self-generated phase power supply as claimed in claim 1, wherein: the phase power supply converter (1) is a Yyn6 connected transformer with a three-phase three-limb iron core structure, and is used for converting line voltage of a system bus into phase voltage and generating a power supply phase power supply.
7. a ground fault current compensation system for a self-generated phase power supply as claimed in claim 1, wherein: the switching switch (2) is a mechanical switch or a power electronic quick switching switch.
8. A ground fault current compensation method of a self-generated phase power supply is characterized by comprising the following steps:
s1, the controller judges whether the bus is earthed in single phase or not and judges the earthed phase;
S2, when a certain phase has a ground fault, the controller controls the fling-cut switch (2) to close the phase switch corresponding to the fault;
S3, compensating the voltage through the voltage regulator (3);
S4, when the on-off time of the fling-cut switch reaches the set time, the controller controls the fling-cut switch to be switched off;
S5, the controller continuously judges whether the single-phase earth fault exists;
and S6, if the ground fault still exists, jumping to the step 2, and if the single-phase ground does not exist, ending the single-phase ground compensation process.
9. The method of claim 8, wherein the method further comprises the steps of: the time for turning off the switching switch set in the step S4 is set according to the line condition.
CN201910992110.3A 2019-10-18 2019-10-18 Earth fault current compensation system and method for self-generating power phase power supply Pending CN110571778A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201910992110.3A CN110571778A (en) 2019-10-18 2019-10-18 Earth fault current compensation system and method for self-generating power phase power supply

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201910992110.3A CN110571778A (en) 2019-10-18 2019-10-18 Earth fault current compensation system and method for self-generating power phase power supply

Publications (1)

Publication Number Publication Date
CN110571778A true CN110571778A (en) 2019-12-13

Family

ID=68785285

Family Applications (1)

Application Number Title Priority Date Filing Date
CN201910992110.3A Pending CN110571778A (en) 2019-10-18 2019-10-18 Earth fault current compensation system and method for self-generating power phase power supply

Country Status (1)

Country Link
CN (1) CN110571778A (en)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110601206A (en) * 2019-10-18 2019-12-20 云南电网有限责任公司电力科学研究院 Earth fault current compensation system and method for self-generating power phase power supply
CN111262251A (en) * 2020-02-06 2020-06-09 云南电网有限责任公司电力科学研究院 Analysis method for voltage sag of full-compensation system
CN111509691A (en) * 2020-05-11 2020-08-07 云南电网有限责任公司电力科学研究院 Ground fault full-compensation topology for multiplexing reactive compensation and design method thereof
CN111509690A (en) * 2020-05-11 2020-08-07 云南电网有限责任公司电力科学研究院 Ground fault full-compensation system and method for multiplexing reactive compensation
CN111769534A (en) * 2020-02-06 2020-10-13 云南电网有限责任公司电力科学研究院 Voltage adjusting method and device of power supply ground fault current compensation system
CN112117747A (en) * 2020-09-24 2020-12-22 云南电网有限责任公司电力科学研究院 Ground fault current hybrid compensation system and matching method

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2013159981A1 (en) * 2012-04-27 2013-10-31 Maschinenfabrik Reinhausen Gmbh Earth-fault system
CN205595770U (en) * 2016-03-28 2016-09-21 国网江西省电力科学研究院 A harmonic elimination device of cooperation on -off arc extinction
CN107276097A (en) * 2017-07-05 2017-10-20 长沙理工大学 Non-effectively earthed system earth fault is mutually depressured the method for safe operation of extinguishing arc
CN107332227A (en) * 2017-09-05 2017-11-07 国网湖南省电力公司 The singlephase earth fault voltage arc extinguishing method and system of isolated neutral system
CN108258674A (en) * 2018-04-10 2018-07-06 南京南瑞继保电气有限公司 The singlephase earth fault arc-extinguishing system and method for a kind of small current neutral grounding system
CN209375132U (en) * 2019-01-18 2019-09-10 苏州立旭智能电气有限公司 The full compensation device of single phase grounding current of electric power network is realized using Z-type compensator transformer
CN210404737U (en) * 2019-10-18 2020-04-24 云南电网有限责任公司电力科学研究院 Ground fault current compensation system for self-generating power phase power supply

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2013159981A1 (en) * 2012-04-27 2013-10-31 Maschinenfabrik Reinhausen Gmbh Earth-fault system
CN205595770U (en) * 2016-03-28 2016-09-21 国网江西省电力科学研究院 A harmonic elimination device of cooperation on -off arc extinction
CN107276097A (en) * 2017-07-05 2017-10-20 长沙理工大学 Non-effectively earthed system earth fault is mutually depressured the method for safe operation of extinguishing arc
CN107332227A (en) * 2017-09-05 2017-11-07 国网湖南省电力公司 The singlephase earth fault voltage arc extinguishing method and system of isolated neutral system
CN108258674A (en) * 2018-04-10 2018-07-06 南京南瑞继保电气有限公司 The singlephase earth fault arc-extinguishing system and method for a kind of small current neutral grounding system
CN209375132U (en) * 2019-01-18 2019-09-10 苏州立旭智能电气有限公司 The full compensation device of single phase grounding current of electric power network is realized using Z-type compensator transformer
CN210404737U (en) * 2019-10-18 2020-04-24 云南电网有限责任公司电力科学研究院 Ground fault current compensation system for self-generating power phase power supply

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
周兴达等: "基于SVG两相电流注入的配电网单相接地故障消弧方法", 《电力系统自动化》, vol. 43, no. 10, 25 May 2019 (2019-05-25) *

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110601206A (en) * 2019-10-18 2019-12-20 云南电网有限责任公司电力科学研究院 Earth fault current compensation system and method for self-generating power phase power supply
CN111262251A (en) * 2020-02-06 2020-06-09 云南电网有限责任公司电力科学研究院 Analysis method for voltage sag of full-compensation system
CN111769534A (en) * 2020-02-06 2020-10-13 云南电网有限责任公司电力科学研究院 Voltage adjusting method and device of power supply ground fault current compensation system
CN111262251B (en) * 2020-02-06 2023-06-30 云南电网有限责任公司电力科学研究院 Analysis method for voltage drop of full compensation system
CN111509691A (en) * 2020-05-11 2020-08-07 云南电网有限责任公司电力科学研究院 Ground fault full-compensation topology for multiplexing reactive compensation and design method thereof
CN111509690A (en) * 2020-05-11 2020-08-07 云南电网有限责任公司电力科学研究院 Ground fault full-compensation system and method for multiplexing reactive compensation
CN111509690B (en) * 2020-05-11 2023-03-31 云南电网有限责任公司电力科学研究院 Ground fault full-compensation system and method for multiplexing reactive compensation
CN112117747A (en) * 2020-09-24 2020-12-22 云南电网有限责任公司电力科学研究院 Ground fault current hybrid compensation system and matching method
CN112117747B (en) * 2020-09-24 2022-09-27 云南电网有限责任公司电力科学研究院 Ground fault current hybrid compensation system and matching method

Similar Documents

Publication Publication Date Title
CN110544931B (en) Earth fault current compensation system and method for self-generating power phase power supply
CN110611317A (en) Earth fault current compensation system and method for self-generating power phase power supply
CN110571778A (en) Earth fault current compensation system and method for self-generating power phase power supply
Wang et al. A novel neutral electromagnetic hybrid flexible grounding method in distribution networks
Wang et al. Efficient grounding for modular multilevel HVDC converters (MMC) on the AC side
CN110544929B (en) Earth fault current compensation system and method for self-generating power phase power supply
CN110601206A (en) Earth fault current compensation system and method for self-generating power phase power supply
CN110729737B (en) Self-generating power supply ground fault compensation system and fault disappearance judging method
CN110718921A (en) Voltage regulator setting system and compensation method of ground fault voltage compensation system
CN106786636A (en) A kind of power network neutral point flexible ground current compensation system
CN111293700A (en) Compensation adjustment method for self-generated power supply ground fault compensation system
CN111262250A (en) Compensation adjustment method for self-generated power supply ground fault compensation system
CN210404755U (en) Ground fault current compensation system for self-generating power phase power supply
CN106786470B (en) Flexible grounding system for neutral point of power grid
CN210404737U (en) Ground fault current compensation system for self-generating power phase power supply
Qu et al. H-infinity control theory apply to new type arc-suppression coil system
Han et al. Analysis on strategies of suppressing secondary arc current in UHV system with controllable shunt reactors
Naghshbandy et al. Blocking DC flux due to geomagnetically induced currents in the power network transformers
Nielsen et al. Control and testing of a dynamic voltage restorer (DVR) at medium voltage level
Hashem et al. Attenuation of Transformer Inrush Current Using Controlled Switching System on Delta-Star Transformer
Dhara et al. Modelling and analysis of an efficient DC reactor type superconducting fault current limiter circuit
Liu et al. Fault current limiting by phase shifting angle control of TCPST
Saleh et al. ANSI 87T-based differential protection of 3ϕ solid-state transformers
Dongre et al. Carrier PWM Based Capacitor Supported Dynamic Voltage Restorer for Voltage Sag and Swell Mitigation in Distribution System
Xu et al. The reactive power compensation and harmonic filtering and the over-voltage analysis of the ITER power supply system

Legal Events

Date Code Title Description
PB01 Publication
PB01 Publication
SE01 Entry into force of request for substantive examination
SE01 Entry into force of request for substantive examination
CB03 Change of inventor or designer information
CB03 Change of inventor or designer information

Inventor after: Liu Hongwen

Inventor after: Wang Ke

Inventor after: Zhao Xianping

Inventor after: Jiang Hongyun

Inventor after: Shen Long

Inventor after: Zhang Gongyuan

Inventor before: Liu Hongwen