CN110601206A - 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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- 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
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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
- Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
- Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
- Y04S10/00—Systems supporting electrical power generation, transmission or distribution
- Y04S10/50—Systems or methods supporting the power network operation or management, involving a certain degree of interaction with the load-side end user applications
- Y04S10/52—Outage or fault management, e.g. fault detection or location
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Abstract
The invention discloses a ground fault current compensation system and method for a self-generated power supply phase power supply, which comprises a phase power supply generator, a phase power supply phase compensator, a fling-cut switch, a controller and a voltage regulator, wherein the input end of the phase power supply generator is connected with a bus, the output end of the phase power supply generator is connected with the input end of the phase power supply phase compensator, the voltage regulator is connected in series between the power supply phase compensator and a system neutral point, the controller is connected with a voltage transformer of the bus, and the output end of the controller is connected with the fling-cut switch. The system passively generates a power supply phase power supply, and puts an inverse power supply phase power supply and a harmonic phase power supply into the system according to fault logic. The method realizes the complete compensation of the ground fault reactive current, the harmonic current and the active current of the power distribution network, and solves the problems that the full compensation cannot be realized and the control is complicated by adopting a power electronic device inversion injection method after the system gets power.
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, the present invention provides a system and a method for compensating a ground fault current of a self-generated phase power supply, in which a phase power supply generator, a phase power supply phase compensator, and a voltage regulator are used to change a line power supply on a bus into a reversed phase power supply, and a neutral point of a switching switch access system is combined to access a fault phase to suppress an overvoltage of the fault phase, so as to achieve a full compensation purpose. The invention effectively solves the problems of complex current control, difficult complete compensation of metallic grounding and the like in the single-phase grounding fault of the power distribution system, and simultaneously, the system is also provided with a variable voltage regulator which regulates the voltage of the line power supply after the phase-changing power supply, thereby achieving the purpose of full compensation of the current and the voltage in the grounding fault.
The invention solves the technical problems by the following technical means:
the invention provides a ground fault current compensation system for self-generating a power supply phase power supply, which comprises a phase power supply generator, a phase power supply phase compensator, a fling-cut switch, a controller and a voltage regulator, wherein the power supply is converted into a three-phase power supply with the same amplitude as the power supply phase power supply through the phase power supply generator and the phase power supply phase compensator of the invention, and then is connected to non-homonymous ends at two sides of the voltage regulator through a fling-cut switch common connection point and a system neutral point, so that phase voltages with the same amplitude and the opposite phases as the power supply phase power supply are obtained at the neutral point, and the purposes of completely compensating the passive ground fault current and ensuring the power supply reliability and safety of the system are achieved.
Further, the phase power supply generator converts the system line voltage into a phase voltage to generate a phase power supply, the phase power supply generator is connected in Dy or Zy or Yd or Yy, and the phase power supply generated by the phase power supply generator has a phase difference with the phase voltage of the power supply of the power grid system according to the transformer principleAnd 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.
The phase compensator compensates the phase difference of the phase voltage generated by the phase power supply generator, and is connected in the form of Dyn or Zyn or Yyn, wherein the neutral point outlet must be grounded, and the output line voltage and the input line voltage have a phase difference
For more convenient implementation of the present technique, the following table 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, as shown in table 1.
TABLE 1 partial phase supply Generator and phase supply phase compensator coupling group
Further, the switching switch is a mechanical switch, a power electronic switch and other fast switching switches.
Further, when the compensation current is output, the internal impedances of the phase supply generator and the phase compensator generate voltage drops, so that the voltage amplitude obtained at the output end (namely, the neutral point) of the phase compensator is lower than the voltage amplitude of the power supply of the power grid system. Therefore, the voltage regulator is arranged in the technical scheme, the voltage drop generated when the phase compensator of the phase power supply outputs the compensation current is regulated through the voltage regulator, and meanwhile, the common connection point of the fling-cut switch and the system neutral point are connected to the non-homonymous ends on two sides of the voltage regulator, so that the phase voltage which is equal to the amplitude of the power supply and opposite to the phase is obtained at the neutral point.
The rated voltage of the primary winding of the phase power supply generator is not lower than the rated voltage of the power grid system, and the rated voltage of the secondary winding of the voltage regulator, namely the side connected with the neutral point of the power grid system, is not lower than the rated voltage of the power grid system.
If the rated voltage ratios of the phase power supply generator, the phase power supply phase compensator and the voltage regulator are m, n and j respectively, the m, n and j should satisfy the following formula:
1≤m×n×j≤1.15
the voltage regulator is connected between a switching switch common connection point and a power grid system neutral point in series, the switching switch common connection point and the system neutral point are connected to non-homonymous ends of two sides of the voltage regulator, the rest connection points of the voltage regulator are grounded, the voltage regulation range of the voltage regulator is +/-15% of rated voltage, and if the control of ground fault current is required to be realized, the rated voltage regulation range can be larger and can be adjusted as +/-100% of voltage.
Further, the controller comprises a fault judgment module and a switch control module.
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 judgment module.
Furthermore, a primary winding leading-out point of the phase power supply generator is connected with a power grid system bus, and secondary winding leading-out points of the phase power supply generator are respectively connected with corresponding connection points of a primary winding of the phase power supply phase compensator.
And 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 lead-out point com.
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. And the A-phase compensation connection point, the B-phase compensation connection point and the C-phase compensation connection point of the secondary winding of the phase power supply phase compensator are respectively connected with the A-phase switch connection point, the B-phase switch connection point and the C-phase switch connection point of the fling-cut switch.
In another aspect, the present invention provides a method for compensating a ground fault current of a self-generated power supply, including:
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 ground fault, the controller controls the switching switch to close the switch of the phase corresponding to the fault;
s3, voltage compensation is carried out through the voltage regulator;
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 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 compensation precision is higher, the control mode is simpler, and the method has incomparable technical advantages.
(2) In the technical scheme provided by the invention, the elements such as the transformer, the voltage regulator, the capacitor, the switch and the like which can stably run for a long time 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 flow chart of a method for compensating a ground fault current of a self-generated power supply according to the present invention;
FIG. 3 is a schematic diagram of the controller;
wherein: the phase power supply system comprises a phase power supply generator 1, a phase power supply phase compensator 2, a fling-cut switch 3, a controller 4, a voltage regulator 5, a fault judgment module 41 and a switch control module 42.
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.
As shown in fig. 1-2, the ground fault current compensation system for self-generating phase power supply of the present invention includes a phase power supply generator 1, a phase power supply phase compensator 2, a switch 3, a controller 4, and a voltage regulator 5.
In this embodiment, the phase power supply generator 1 is a transformer connected with Dy11, and is connected to a bus to convert a bus voltage into a phase voltage, and the voltage ratio is m.
The phase compensator 2 is a Dyn1 coupled transformer coupled to the phase power generator 1 for compensating the phase, and has a voltage ratio of n.
In this embodiment, the input end of the phase power supply generator 1 is connected to the bus, the output end of the phase power supply generator 1 is connected to the input end of the phase power supply phase compensator 2, the voltage regulator 5 is connected in series between the phase power supply phase compensator 2 and the system neutral point, the controller 4 is connected to the voltage transformer of the bus, the output end of the controller 4 is connected to the fling-cut switch 3, the common connection point of the fling-cut switch 3 and the system neutral point are connected to the non-homonymous terminals on both sides of the voltage regulator 5, and the other connection points of the voltage regulator 5 are grounded. The voltage ratio of the voltage regulator 5 is j.
And m n j 1.
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 Ua1Ub1、Uc1And U isab1、Ubc1、Uca1Phase angle leading U respectivelyAB、UBC、UCAAngle 30 DEG and phase supply power generator (1) having voltage ratio m and thus
And
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、Uc2Dyn1 is coupled to a group of transformers according to transformer principles with the secondary side line voltage lagging 30 deg. from the primary side line voltage, i.e. Uab2、Ubc2、Uca2Phase angles lagging Uab1、Ubc1、Uca130 ° and the voltage ratio of the phase compensator 2 of the phase power supply is n, then:
according to the formulae 41,42,43, there are:
because:
bringing formula 44 into formula 45 is:
in this embodiment, the common connection point of the fling-cut switch 3 and the system neutral point are connected to the non-homonymous terminals on both sides of the voltage regulator 5, and the voltage ratio is j, and m × n × j is 1, so when a switch of a certain phase of the fling-cut switch 3 is closed, the voltages obtained at the system neutral point are respectively:
therefore, when a certain phase is earthed in a single phase and a corresponding phase switch of the switching switch is closed, voltage which is equal to the amplitude of the voltage of the power supply phase of the power grid system and opposite to the phase is obtained at the neutral point of the system, so that the voltage of the earthed phase is zero, and the voltage and the current of the earth fault point are also zero.
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 (8)
1. The utility model provides a ground fault current compensation system from production power supply phase power, its characterized in that, includes looks power supply generator (1), looks power supply phase compensator (2), on-off switch (3), controller (4) and voltage regulator (5), the input and the bus connection of looks power supply generator (1), the output of looks power supply generator (1) is connected with the input of looks power supply phase compensator (2), voltage regulator (5) concatenate between power supply phase compensator (2) and system neutral point, controller (4) are 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 phase power supply generator (1) is connected in Dy or Zy or Yd or Yy.
3. A ground fault current compensation system for a self-generated phase power supply as claimed in claim 1, wherein: the connection form of the phase power supply phase compensator (2) is Dyn or Zyn or Yyn.
4. A ground fault current compensation system for a self-generated phase power supply as claimed in claim 1, wherein: the switching switch (3) is a mechanical switch or a power electronic quick switching switch.
5. A ground fault current compensation system for a self-generated phase power supply as claimed in claim 1, wherein: and a common connection point and a system neutral point of the fling-cut switch (3) are connected to non-homonymous ends on two sides of the voltage regulator (5), and other connection points of the voltage regulator (5) are grounded.
6. A ground fault current compensation system for a self-generated phase power supply as claimed in claim 1, wherein: the controller (4) comprises a fault judgment module (41) and a switch control module (42).
7. 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 (4) controls the switching switch (3) to close the phase switch corresponding to the fault;
s3, compensating the voltage through the voltage regulator (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.
8. The method of claim 7, wherein the method further comprises: the time for turning off the switching switch set in the step S4 is set according to the line condition.
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| WO2021073323A1 (en) * | 2019-10-18 | 2021-04-22 | 云南电网有限责任公司电力科学研究院 | Ground fault current compensation system, method and apparatus for self-produced phase power supply |
| 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 |
| CN111769534B (en) * | 2020-02-06 | 2022-06-07 | 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 |
| CN112054533A (en) * | 2020-09-24 | 2020-12-08 | 云南电网有限责任公司电力科学研究院 | Direct resistance design method and system of full compensation system based on fault phase residual voltage |
| CN112054533B (en) * | 2020-09-24 | 2024-05-28 | 云南电网有限责任公司电力科学研究院 | Full compensation system direct resistance design method and system based on fault phase residual voltage |
| CN113687181A (en) * | 2021-03-25 | 2021-11-23 | 中国科学院广州能源研究所 | Injection method for coping with offset effect in island detection method |
| CN113687181B (en) * | 2021-03-25 | 2023-09-05 | 中国科学院广州能源研究所 | Injection method for coping with cancellation effect in island detection method |
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