CN110611317A - 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 PDFInfo
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Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/12—Circuit arrangements for ac mains or ac distribution networks for adjusting voltage in ac networks by changing a characteristic of the network load
- H02J3/16—Circuit arrangements for ac mains or ac distribution networks for adjusting voltage in ac networks by changing a characteristic of the network load by adjustment of reactive power
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/18—Arrangements for adjusting, eliminating or compensating reactive power in networks
- H02J3/1807—Arrangements for adjusting, eliminating or compensating reactive power in networks using series compensators
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/30—Reactive power compensation
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Abstract
The invention discloses a ground fault current compensation system and method for a self-generating power supply phase power supply. 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. The method has the advantages that the complete compensation of the ground fault reactive current, the harmonic current and the active current of the power distribution network is realized, the defect of incomplete compensation by adopting an inversion injection method of a power electronic device 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. The invention has high efficiency and accuracy, can completely compensate overvoltage and overcurrent generated by ground fault, ensures the safety of a power grid and equipment, and completely avoids personal electric shock risk.
Description
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.
Swidish Neutral, sweden, "application of full compensation technique for ground fault neutralizer" discloses a method for compensating the current at the ground fault point by injecting current to the 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 capable of generating a phase power supply by self, which comprises a phase power supply generator, a phase power supply phase compensator, a fling-cut switch, a controller and a voltage transformation device, wherein the voltage transformation device is a compensation capacitor bank (reactor bank) or a series capacitor bank (series reactor bank) or a voltage regulator. And the output end of the phase power supply phase compensator is connected with the neutral point of the system through a fling-cut switch. The output end of the phase compensator of the phase power supply can obtain voltage which has the same amplitude and is opposite to the phase of the power supply voltage of the power grid system, and the voltage can completely compensate the current of the ground fault point.
Further, a primary winding lead-out point of the phase power supply generator is connected with a power grid system bus; and the leading-out points of the secondary windings of the phase power supply generator are respectively connected with the corresponding phase connection points of the primary windings of the phase power supply phase compensator.
The secondary winding of the phase compensator of the phase power supply is respectively provided with an A-phase compensation connection point, a B-phase compensation connection point, a C-phase compensation connection point and a neutral point leading-out point n; the neutral point outlet point n of the phase compensator of the phase power supply is grounded.
Further, the switching switch is provided with an A-phase switch connection point, a B-phase switch connection point, a C-phase switch connection point and a public connection point.
Furthermore, an A-phase compensation connection point, a B-phase compensation connection point and a C-phase compensation connection point of the secondary winding of the phase power supply phase compensator are respectively connected with an A-phase switch connection point, a B-phase switch connection point and a C-phase switch connection point of the fling-cut switch.
Further, the system line voltage is converted into phase voltage through a phase power supply generator to generate a phase power supply, and the connection form of the phase power supply generator can be Dy or Zy or Yd or Yy, but when the neutral point of a secondary winding of the phase power supply generator is led out, the phase power supply generator cannot be grounded. According to the transformer principle, the phase difference exists between the phase voltage of the power supply phase power generated by the phase power supply generator and the phase voltage of the power supply of the power grid systemAnd is
WhereinPhase difference between the line voltage of the phase-fed power generator and the line voltage corresponding to the grid system, n being [0,11 ]]An integer within the range.
Furthermore, the rated voltage of the phase power supply generator has no conflict or influence on the implementation of the invention in principle, but the secondary winding of the recommended phase power supply generator has the rated line voltage of 0.4kV or more and is within the rated voltage of a power grid system by considering the prior mature technology and the more convenient implementation of the technology. But the voltage ratio of the primary winding and the secondary winding of the phase power supply generator is k.
The phase power supply phase compensator compensates phase voltage phase difference generated by the phase power supply generator; its connection form may be Dyn or Zyn or Yyn, its y neutral point terminal and must be grounded. The output line voltage and the input line of the power supplyPhase difference in pressure
The rated voltage of a primary winding of the phase compensator of the phase power supply generates the rated voltage of a secondary winding for the phase power supply, the rated line voltage of the secondary winding of the phase compensator of the phase power supply is the rated voltage of a power grid system, and the voltage ratio of the primary winding to the secondary winding is 1/k.
Further, to facilitate the implementation of the present technology, table 1 shows the connection groups that can be used by some phase power supply generators and the connection groups that should be used by the corresponding phase power supply phase compensators.
TABLE 1 partial phase supply Generator coupling set for use with phase supply phase compensator
Further, the switching switch is a mechanical switch, a power electronic switch and other fast switching switches.
Furthermore, when the phase power supply generator and the phase power supply phase compensator output the compensation current, voltage drop is generated at internal impedances of the phase power supply generator and the phase power supply phase compensator, so that the voltage amplitude obtained at the output end (namely, a neutral point) of the phase power supply phase compensator is lower than the voltage amplitude of the power supply of a power grid 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 C is a series regulating capacitor, omega is the angular frequency of the power grid system, and 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 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 the number of ground faults of the tree fault of the line is large or other conditions easily cause a large number of ground faults.
The invention initiatively provides that the line voltage which is not changed before and after the single phase grounding in the system passes through the phase power supply generator; the phase compensator of the phase power supply is converted into a phase power supply of a system power supply and is used 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 ground fault current compensation system for a self-generating power supply of the present invention;
FIG. 2 is a schematic diagram of a compensation voltage structure of a series capacitor bank of a ground fault current compensation system of a self-generating power supply according to the present invention;
FIG. 3 is a schematic diagram of a compensation voltage structure of a compensation capacitor bank of the ground fault current compensation system of the self-generated power supply according to the present invention;
FIG. 4 is a schematic diagram of a voltage regulator compensation voltage structure of a ground fault current compensation system of a self-generated power supply according to the present invention;
FIG. 5 is a schematic diagram of the phase power supply generation and conversion process according to the present invention;
FIG. 6 is a flow chart of a method for compensating a ground fault current of a self-generated power supply according to the present invention;
wherein: the phase-to-phase power supply system comprises a phase-to-phase power supply generator 1, a phase-to-phase power supply phase compensator 2, a fling-cut switch 3, a controller 4, a transformation device 5, a compensation capacitor bank (compensation reactor) 51, a series capacitor bank (series reactor bank) 52, a voltage regulator 53 and a line-to-phase converter 6.
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 phase-locked loop power supply comprises a phase power supply generator 1, a phase power supply phase compensator 2, a fling-cut switch 3, a controller 4 and a voltage transformation device 5.
The phase power supply generator 1 is a transformer connected with Dy11 and connected to the bus to convert the bus voltage into phase voltage; the phase compensator 2 of the phase power supply is a transformer connected with Dyn7, and is connected with the phase power supply generator 1 and used for compensating the phase; the switching switch 3 is connected to the phase compensator 2 of the phase power supply and controls switching through the controller 4.
In this embodiment, the controller 4 is configured to control the switching of the switching switch 3 and determine a fault phase;
in this embodiment, one end of the transformer 5 is connected to the on-off switch 3, and the other end is connected to the neutral point of the bus.
In this embodiment, the voltages of the bus power supply lines are recorded as UAB、UBC、UCAThe phase voltages of the bus power supply are respectively UA、UB、UC(ii) a The line voltages output by the phase-recording power supply generator 1 are respectively Uab1、Ubc1、Uca1The phase voltages are respectively Ua1、Ub1、Uc1According to the transformer principle, Dy11 is connected with the transformers of the group, the secondary side line voltage is 30 degrees ahead of the primary side voltage, namely the bus line voltage is transmitted by the phase power supply generator 1 and then the bus line voltage U is connectedAB、UBC、UCAConverted into phase voltage Ua1、Ub1、Uc1And U isab1、Ubc1、Uca1Phase angle leading U respectivelyAB、UBC、UCAThe angle 30 ° is as in formula 1:
the voltage ratio of the primary winding and the secondary winding of the phase power supply generator 1 is k; thus, there is formula 2:
recording the line voltage output by the phase compensator 2 of the phase power supply as Uab2、Ubc2、Uca2The phase voltages are respectively Ua2、Ub2、Uc2Dyn7 is coupled to a group of transformers according to transformer principles with the secondary side line voltage lagging the primary side line voltage by 210, i.e. Uab2、Ubc2、Uca2Phase angles lagging Uab1、Ubc1、Uca1210 °, can be formulated as equation 3:
the voltage ratio of the primary winding to the secondary winding of the phase compensator 2 of the phase power supply is 1/k, so that the following formula 4:
from formulas 1 and 3, formula 5 is obtained:
from equations 2 and 4, equation 6 can be derived:
further, as can be seen from equation 7:
in this embodiment, the bus line voltage UAB、UBC、UCAU transmitted by the phase power supply generator 1 and the phase power supply phase compensator 2ab2、Ubc2、Uca2Opposite phase, so that the system bus side phase supply voltage UA、UB、UCAnd U transmitted by the phase power supply generator 1 and the phase power supply phase compensator 2a2、Ub2、Uc2Opposite in phase and equal in amplitude. If the system generates A-phase single-phase grounding, the A-phase switch of the fling-cut switch 3 is closed, and the U is connecteda2A neutral point voltage U is obtained by a voltage transformation device 50，U0And UAOpposite phase, equal amplitude, and naturalAnd outputting active power and reactive power which need to be compensated. Therefore, the grounding phase-to-ground voltage is zero, 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, referring to fig. 5, a schematic diagram of voltage phase change in a phase power supply generating and converting process of the present invention is shown. After the bus line voltage is transmitted by the phase power supply generator 1, the bus line voltage U is transmittedAB、UBC、UCAConverted into phase voltage Ua1、Ub1、Uc1And U isab1、Ubc1、Uca1Phase angle leading U respectivelyAB、UBC、UCAThe angle is 30 deg.. Further passes through a phase compensator 2 of a phase power supply, and then Ua2、Ub2、Uc2Power supply voltage U with system bus side phaseA、UB、UCThe phases are opposite.
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 (10)
1. The utility model provides a from earth fault current compensation system who produces power supply phase power, its characterized in that, includes line phase-change converter (6), on-off switch (3), controller (4), line phase-change converter (6) are connected the back with the bus and are passed through on-off switch (3) and insert the neutral point of system, the input of controller (4) is connected with the voltage transformer of bus, the output of controller (4) is connected with the input of on-off switch (3).
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 (5).
3. A ground fault current compensation system for a self-generated phase power supply as claimed in claim 1, wherein: the line phase-change converter (6) comprises a phase power supply generator (1) and a phase power supply phase compensator (2), the input end of the phase power supply generator (1) is connected with a power grid system bus, the output end of the phase power supply generator (1) is connected with the input end of the phase power supply phase compensator (2), and the output end of the phase power supply phase compensator (2) is connected with the input end of the switching switch (3).
4. A ground fault current compensation system for a self-generated phase power supply as claimed in claim 3, wherein: the phase power supply generator (1) is connected in a Dy or Zy or Yd or Yy mode, and the phase power supply phase compensator (2) is connected in a Dyn or Zyn or Yyn mode.
5. A ground fault current compensation system for a self-generated phase power supply as claimed in claim 2, wherein: the transformer device (5) is a compensation capacitor bank or a reactor bank (51), and the compensation capacitor bank or the reactor bank (51) is in triangular or star connection with the phase compensator (2) of the phase power supply.
6. A ground fault current compensation system for a self-generated phase power supply as claimed in claim 2, wherein: the transformer device (5) is a series capacitor bank or a series reactor bank (52), and the series capacitor bank or the series reactor bank (52) is connected in series between the switching switch (3) and a system neutral point.
7. A ground fault current compensation system for a self-generated phase power supply as claimed in claim 2, wherein: the voltage transformation device (5) is a voltage regulator (53), and the voltage regulator (53) is connected between the switching switch (3) and a system neutral point in series.
8. A ground fault current compensation system for a self-generated phase power supply as claimed in claim 1, wherein: the switching switch (3) can be a mechanical switch or a power electronic quick switching switch.
9. A ground fault current compensation method of a self-generated phase power supply is characterized by comprising 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 switching switch (3) to close the phase switch corresponding to the fault;
s3, voltage compensation is carried out through the transformer (5);
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.
10. The method of claim 9, wherein the method further comprises the step of: the time for turning off the switching switch set in the step S4 is set according to the line condition.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910992109.0A CN110611317A (en) | 2019-10-18 | 2019-10-18 | Earth fault current compensation system and method for self-generating power phase power supply |
| PCT/CN2020/114341 WO2021073323A1 (en) | 2019-10-18 | 2020-09-10 | Ground fault current compensation system, method and apparatus for self-produced phase power supply |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910992109.0A CN110611317A (en) | 2019-10-18 | 2019-10-18 | Earth fault current compensation system and method for self-generating power phase power supply |
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| CN110611317A true CN110611317A (en) | 2019-12-24 |
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| CN201910992109.0A Pending CN110611317A (en) | 2019-10-18 | 2019-10-18 | Earth fault current compensation system and method for self-generating power phase power supply |
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| CN (1) | CN110611317A (en) |
| WO (1) | WO2021073323A1 (en) |
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| 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 |
| CN111193251A (en) * | 2020-02-06 | 2020-05-22 | 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 |
| 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 |
| CN111262250A (en) * | 2020-02-06 | 2020-06-09 | 云南电网有限责任公司电力科学研究院 | Compensation adjustment method for self-generated power supply ground fault compensation system |
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| 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 |
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| CN111193251B (en) * | 2020-02-06 | 2022-04-05 | 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 |
| CN111262250B (en) * | 2020-02-06 | 2023-06-30 | 云南电网有限责任公司电力科学研究院 | Compensation adjustment method of self-generating power supply ground fault compensation system |
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| CN112054494A (en) * | 2020-09-24 | 2020-12-08 | 云南电网有限责任公司电力科学研究院 | Protection and setting method for earth fault current full-compensation system |
| CN112152194A (en) * | 2020-09-24 | 2020-12-29 | 湖南大学 | Power distribution network single-phase earth fault arc extinction system and control method thereof |
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