CN110544929A - 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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- CN110544929A CN110544929A CN201910992149.5A CN201910992149A CN110544929A CN 110544929 A CN110544929 A CN 110544929A CN 201910992149 A CN201910992149 A CN 201910992149A CN 110544929 A CN110544929 A CN 110544929A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H9/00—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection
- H02H9/08—Limitation or suppression of earth fault currents, e.g. Petersen coil
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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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Abstract
the invention discloses a ground fault current compensation system and method for a self-generated power phase power supply, which comprises a compensation transformer, a combination switch, a coupling voltage regulating transformer and a controller, wherein the input end of the compensation transformer is connected with a bus, the output end of the compensation transformer is connected with the input end of the combination switch, the output end of the combination switch is connected with a neutral point, and the coupling voltage regulating transformer is connected between the combination switch and the neutral point in series. 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 realizes complete compensation of the ground fault reactive current, the harmonic current and the active current of the power distribution network, and overcomes the defect of incomplete compensation by adopting an inversion injection method of a power electronic device after power is taken from a bus system. The invention can completely compensate the overvoltage and overcurrent generated by the grounding fault and completely eliminate the risk of personal electric shock.
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 ground fault current of a self-generated power supply phase, in which a compensation transformer is used to change a line power supply on a bus into a reverse phase power supply, and a neutral point of a combination switch access system is combined to access an overvoltage of a fault phase to suppress the overvoltage of the fault phase, so as to achieve the purpose of full compensation.
The invention solves the technical problems by the following technical means:
the invention provides a ground fault current compensation system for a self-generated power phase power supply, which comprises a compensation transformer, a combination switch, a coupling voltage regulating transformer and a controller, wherein the input end of the compensation transformer is connected with a bus, the output end of the compensation transformer is connected with the input end of the combination switch, and the output end of the combination switch is connected with a neutral point.
Further, the connection groups of the compensation transformer are Dy1 and Dy 11. The primary side rated voltage of the compensation transformer (1) is the rated voltage US of a power grid system, and the secondary side rated voltage is 100V-US; the primary side rated voltage of the coupling voltage regulating transformer is equal to the secondary side rated voltage of the compensation transformer, and the secondary side rated voltage of the coupling voltage regulating transformer is within the voltage regulating range of +/-5% - +/-50% of the coupling voltage regulating transformer.
further, the primary side of the compensation transformer is connected with a power grid system bus; and the secondary side of the compensation transformer is connected with the combined switch.
Furthermore, the combination switch comprises an A-phase-separating switch, an A-phase grounding switch, a B-phase-separating switch, a B-phase grounding switch, a C-phase-separating switch and a C-phase grounding switch. One end of an A-phase split-phase switch of the combination switch is connected with one end of an A-phase grounding switch to form an A-phase connecting point of the combination switch; one end of a phase B split switch of the combined switch is connected with one end of a phase B grounding switch to form a phase B connecting point of the combined switch; one end of a C-phase split-phase switch of the combination switch is connected with one end of a C-phase grounding switch to form a C-phase connecting point of the combination switch; the other end of the A-phase-splitting switch, the other end of the B-phase-splitting switch and the other end of the C-phase-splitting switch of the combined switch are connected together to form a compensation connection point of the combined switch. The A phase of the combined switch is connected with the other end of the grounding switch, the B phase is connected with the other end of the grounding switch, and the C phase is connected with the other end of the grounding switch and is grounded.
The connection mode of the combination switch, the coupling voltage regulating transformer and the system neutral point has two modes:
The first mode is as follows:
the compensation connection point of the combined switch is connected with the primary side homonymous end of the coupling voltage-regulating transformer; and the other end of the primary side of the coupling voltage regulating transformer is grounded. The same-name end of the secondary side of the coupling voltage regulating transformer is connected with a neutral point of a power grid system, and the other end of the coupling voltage regulating transformer is grounded.
The second mode is as follows:
The compensation connection point of the combined switch is connected with the primary side homonymous end of the coupling voltage-regulating transformer; and the other end of the primary side of the coupling voltage regulating transformer is grounded. The dotted terminal of the secondary side of the coupling voltage regulating transformer is grounded, and the other end of the secondary side of the coupling voltage regulating transformer is connected with a neutral point of a power grid system.
further, the control comprises a fault judgment module and a switch control module, and the fault judgment module can judge whether the system is in single-phase grounding or not and judge the grounding phase according to the three-phase voltage of the system bus, the zero-sequence voltage, the zero-sequence current of the line and the like. Since the ground fault judgment and the ground phase judgment have mature technologies, the details are not repeated in the invention. And the switch control module controls the on/off of each switch of the combined switch.
Further, an implementation method of the single-phase grounding full compensation system 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 some phase has earth fault, controlling the switch of the combination switch according to the earth phase and the control table of the combination switch;
S3, adjusting voltage through a coupling voltage-adjusting transformer;
S4, when the closing time of the combination switch reaches the set time, the controller controls the combination 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 time for turning off the combination switch set in step S4 is set according to the line operating condition, for example, the time for turning off is set according to the situation that there are many ground faults of the line tree obstacle or other situations that easily cause many ground faults.
Further, when the connection mode of the combination switch, the coupling voltage regulating transformer and the system neutral point is the first mode, the control table of the combination switch is shown in table 1:
TABLE 1 combination switch control table as in TABLE 1
When the connection mode of the combination switch, the coupling voltage regulating transformer and the system neutral point is the second mode, the control table of the combination switch is shown in table 2:
Table 2 combination switch control table 2
The working principle of the invention is as follows: the method comprises the steps that firstly, a controller judges the grounding phase of a bus through a voltage transformer, after a certain phase of the bus breaks down, the controller controls corresponding switches to be closed through a combination switch, and since the reversed-phase voltage output by a compensation transformer has a certain voltage drop due to internal resistance, the voltage is adjusted through a coupling voltage-regulating transformer, and then the reversed-phase voltage is boosted to be connected to a neutral point, so that the purpose of completely compensating overvoltage is achieved.
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 first connection mode of a single-phase grounding full compensation system according to the present invention;
FIG. 2 is a schematic diagram of a second connection mode of a single-phase grounding full compensation system according to the present invention;
FIG. 3 is a schematic diagram of a combination switch according to the present invention;
FIG. 4 is a schematic diagram of the controller of the present invention;
FIG. 5 is a schematic diagram illustrating a generation and conversion process of a first connection phase power supply according to the present invention;
FIG. 6 is a schematic diagram illustrating a second connection mode of the power supply generation and conversion process according to the present invention;
FIG. 7 is a schematic flow chart of the method of the present invention;
Wherein: the device comprises a compensation transformer 1, a combination switch 2, a coupling regulating transformer 3, a controller 4, an A-phase-separating switch 21, an A-phase grounding switch 22, a B-phase-separating switch 23, a B-phase grounding switch 24, a C-phase-separating switch 25, a C-phase grounding switch 26, 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. 1-6, a system and method for compensating a ground fault current of a self-generated phase power supply according to the present invention:
in this embodiment, fig. 5 shows a voltage conversion process of an exemplary embodiment in the first connection mode. The connection group of the compensation transformer (1) is Dy11, and the voltage ratio is k. The voltage ratio of the coupling regulating transformer is that the connection mode of the combination switch (2), the coupling regulating transformer (3) and a system neutral point is a first mode:
recording the voltages of a bus power supply line as UAB, UBC and UCA respectively, and recording the phase voltages of the bus power supply line as UA, UB and UC respectively; the line voltages output by the phase-recording power supply generator (1) are Uab1, Ubc1 and Uca1 respectively, and the phase voltages are Ua1, Ub1 and Uc1 respectively.
The basic principle of the three-phase system of the power grid is as follows:
Through the compensating transformer (1), the output line voltage thereof should be:
if the system generates A phase grounding, the A phase grounding switch and the C phase split-phase switch of the combination switch are closed when the system is searched. Therefore, the voltage of the primary winding of the input coupling voltage regulating transformer is equal to the output voltage of the secondary winding of the coupling voltage regulating transformer due to the voltage ratio of the coupling voltage regulating transformer
and due to
And according to equation 41:
thus, the two are equal in amplitude and opposite in phase.
Fig. 6 shows the voltage conversion process of the exemplary embodiment in the second connection mode. The connection group of the compensation transformer (1) is Dy11, and the voltage ratio is k. The voltage ratio of the coupling regulating transformer is that the connection mode of the combination switch (2), the coupling regulating transformer (3) and a system neutral point is a second mode:
Recording the voltages of a bus power supply line as UAB, UBC and UCA respectively, and recording the phase voltages of the bus power supply line as UA, UB and UC respectively; the line voltages output by the phase-recording power supply generator (1) are Uab1, Ubc1 and Uca1 respectively, and the phase voltages are Ua1, Ub1 and Uc1 respectively.
the basic principle of the three-phase system of the power grid is as follows:
Through the compensating transformer (1), the output line voltage thereof should be:
if the system is connected with the phase A ground, the table lookup can obtain the result, and the phase A split switch and the phase C ground switch of the combined switch are closed at the moment. Therefore, the voltage input to the primary winding of the transformer should be equal to the voltage output from the secondary winding of the transformer, and the voltage ratio of the transformer is such that the primary winding voltage is opposite to the secondary winding voltage according to the connection mode
and due to
And according to equation 51:
thus, the two are equal in amplitude and opposite in phase.
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 ground fault current compensation system is characterized by comprising a compensation transformer (1), a combination switch (2) and a controller (4), wherein the input end of the compensation transformer (1) is connected with a bus, the output end of the compensation transformer (1) is connected with the input end of the combination switch (2), and the output end of the combination switch (2) is connected with a neutral point.
2. a ground fault current compensation system for a self-generated phase power supply as claimed in claim 1, wherein: and a coupling voltage regulating transformer (3) is also connected in series between the combination switch (2) and the neutral point.
3. a ground fault current compensation system for a self-generated phase power supply as claimed in claim 1, wherein: the connection group of the compensation transformer (1) is in the form of Dy1 or Dy 11.
4. A ground fault current compensation system for a self-generated phase power supply as claimed in claim 1, wherein: the combination switch (2) comprises an A-phase-splitting switch (21), an A-phase grounding switch (22), a B-phase-splitting switch (23), a B-phase grounding switch (24), a C-phase-splitting switch (25) and a C-phase grounding switch (26), wherein the A-phase grounding switch (22), the B-phase grounding switch (24) and the C-phase grounding switch (26) are grounded, and the A-phase-splitting switch (21) and the B-phase-splitting switch (23) are connected with the C-phase-splitting switch (25).
5. A ground fault current compensation system for a self-generated phase power supply as claimed in claim 2, wherein: the compensation connection point of the combined switch (2) is connected with the primary side homonymous end of the coupling voltage regulating transformer (3), the other end of the primary side of the coupling voltage regulating transformer (3) is grounded, the secondary side homonymous end of the coupling voltage regulating transformer (3) is connected with a neutral point of a power grid system, and the other end of the secondary side of the coupling voltage regulating transformer is grounded.
6. The system of claim 5, wherein the system further comprises a power supply circuit configured to generate a power supply voltage from the power supply source, wherein the power supply circuit is configured to: the combination switch (2) and the coupling voltage regulating transformer (3) have another connection mode: the compensation connection point of the combined switch (2) is connected with the primary side homonymous end of the coupling voltage regulating transformer (3), the other end of the primary side of the coupling voltage regulating transformer (3) is grounded, the secondary side homonymous end of the coupling voltage regulating transformer (3) is grounded, and the other end of the secondary side is connected with a neutral point of a power grid system.
7. 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).
8. 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 generates single-phase grounding or not through the controller (4) and judging a grounding phase;
S2, when a certain phase has ground fault, controlling the corresponding switch of the combined switch (2) to be closed according to the ground phase and the combined switch control table;
s3, adjusting voltage through a coupling voltage-adjusting transformer (3);
s4, when the closing time of the combined switch reaches the set time, the controller (4) controls the combined switch to be switched off;
S5, the controller (4) 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 setting of the combination switch on time in step S4 is set according to different line conditions.
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| CN111505440A (en) * | 2020-04-27 | 2020-08-07 | 云南拓普特种电源科技有限公司 | Ground fault detection and protection system and method based on class D power amplifier |
| 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 |
| CN112909910A (en) * | 2021-01-18 | 2021-06-04 | 长沙理工大学 | Arc extinction method and device for ground fault of power distribution network |
| CN113890046A (en) * | 2021-09-30 | 2022-01-04 | 华能伊敏煤电有限责任公司 | Open coal mine 35kV distribution lines quick voltage regulation system |
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