CN105914786A - Islanding protection and fault ride-through coordinated operation method suitable for distributed inverter system - Google Patents
Islanding protection and fault ride-through coordinated operation method suitable for distributed inverter system Download PDFInfo
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- CN105914786A CN105914786A CN201610322547.2A CN201610322547A CN105914786A CN 105914786 A CN105914786 A CN 105914786A CN 201610322547 A CN201610322547 A CN 201610322547A CN 105914786 A CN105914786 A CN 105914786A
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- H02J3/382—
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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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- 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
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
- H02J3/388—Islanding, i.e. disconnection of local power supply from the network
Abstract
The invention discloses an islanding protection and fault ride-through coordinated operation method suitable for a distributed inverter system. The islanding protection and fault ride-through coordinated operation method comprises the steps of: coordinating two control functions of islanding protection and fault ride-through of the distributed inverter system according to variations of voltage and frequency measurement values at a PCC; providing certain voltage/frequency support for a power distribution network through fault ride-through by the distributed inverter system preferentially when the power distribution network fails; supplying power to local loads continuously through short-term island operation by the distributed inverter system while the fault ride-through cannot be achieved and the condition of island operation is satisfied; and splitting the distributed inverter system from the power distribution network to stop power supply when all the conditions are not satisfied. The islanding protection and fault ride-through coordinated operation method can achieve benefit maximization of the power grid by adopting local renewable energy sources, greatly improves power supply reliability of the system while ensuring power supply safety, and is conductive to high-proportion grid connection of the distributed grid-connected inverter system based on the renewable energy sources in the power distribution network.
Description
Technical field
The present invention relates to operation and control of electric power system field, particularly relate to one and be applicable to point
Isolated island protection and the fault traversing coordinated operation method of cloth inversion system.
Background technology
Increasingly serious energy crisis and environmental problem promote photovoltaic, wind-powered electricity generation etc. based on cleaning can be again
The distributed generation technology of the raw energy is developed rapidly, and then improves energy resource structure and profit
By efficiency, improve economy, safety and the reliability of electric power transmission.But, photovoltaic,
The distributed generation system based on inverter such as wind-powered electricity generation, the most distributed inversion system,
Permeability in electrical network can be more and more higher, and its Thief zone level is dispatched to distribution system and whole equally
End subscriber brings new challenge.
The grid-connected requirement of distributed inversion system issued at present, such as IEEE Std.1547-2003
With IEEE Std 929-2000, for instructing under the horizontal situation of hyposmosis distributed power source also
Net.For the person and equipment security consideration, it is desirable to distributed inversion system is at grid collapses
Time, it is possible to fault detected in time, and from power distribution network off-the-line, referred to as isolated island protection.It practice,
Distributed inversion system ratio in power distribution network is the most gradually in high permeability trend.Such as, moral
The photovoltaic of state nearly 70% is installed and is connected with low-voltage network.If still using biography under grid fault conditions
It from power distribution network off-the-line, will be brought serious challenge to power system by system control method, the most right
End user device.Such as, the anti-islanding causing photovoltaic system off-the-line is run and is likely to result in electricity
Pressure flickering, the low pressure of user side and power quality problem, cause the economic loss of user, and then
Limit the operation of power networks business receiving power to regenerative resources such as photovoltaics.Meanwhile, also cannot realize point
Cloth inversion system benefit in terms of improving electrical network power supply reliability, raising system stability.
Visible, traditional grid-connected criterion has not been suitable for distributed inversion system in following power distribution network
Thief zone situation.Distributed inversion system has more flexible control ability, by controlling it
Can be that electrical network provides more support.Look to the future the height of distributed inversion system in power distribution network
Permeability, when grid collapses, distributed inversion system should have fault ride-through capacity,
The assistant services such as reactive power support are provided for electrical network simultaneously, are actively engaged in the complete of electrical network and dynamically adjust
Joint, improves the stability of system, reliability and the quality of power supply.Some European country has been directed towards
Distributed inversion system Thief zone situation in electrical network, is modified grid-connected criterion.As
Specifying in Germany's medium voltage network criterion, the distributed power source being connected to the grid should have low-voltage crossing
Ability, it is possible to provide assistant service, such as reactive power enabling capabilities.
For adapting to the high permeability situation of distributed inversion system in following power distribution network, distributed inverse
Change system should have isolated island protection simultaneously and fault traversing two kinds controls function, is ensureing power supply
While safety for electrical network provide secure support, with improve the stability of system, reliability and
The quality of power supply.But, have Grid-connection standards at present and consider that above two controls merit the most simultaneously
Can, and there is paradox in target and time rule controlling in the two.
Summary of the invention
For defect present in prior art, it is an object of the invention to provide one and be applicable to
Isolated island protection and the fault traversing coordinated operation method of distributed inversion system.The method can be fine
Isolated island protection and the fault traversing two kinds control function of distributed inversion system is coordinated on ground, not only may be used
To realize the local regenerative resource maximizing the benefits to power distribution network, ensureing power supply safety simultaneously
On the premise of property, it is greatly enhanced in the power supply reliability of system, beneficially power distribution network based on can
The distributed inversion system of the renewable sources of energy is the most grid-connected.
For reaching object above, the present invention adopts the technical scheme that:
A kind of isolated island protection being applicable to distributed inversion system and fault traversing coordinated operation side
Method, the method is according to points of common connection (PCC, Point Of Common Connection)
The voltage V at placepccWith the situation of change of the measuring value of frequency f, coordinate distributed inversion system
Isolated island protection and fault traversing two kinds control function: when power distribution network breaks down, distributed inverse
Becoming System Priority provides certain voltage/frequency to support by fault traversing into power distribution network；Institute
State distributed inversion system when cannot realize described fault traversing, meet islet operation condition
In the case of, described distributed inversion system is that local based model for load duration supplies by short-term islet operation
Electricity；Only in the case of aforementioned condition is the most ungratified, described distributed inversion system is just from joining
Grid disconnection, stops power supply.
In the above-mentioned methods, the isolated island protection of described distributed inversion system is coordinated with fault traversing
Operation method comprises the steps:
Detect the voltage V at described PCCpccWith frequency f,
If the voltage V at described PCCpccWith frequency f at normal operating zone A, now power distribution network
Properly functioning, the running status of described distributed inversion system is I；Described I is described distribution
Formula inversion system is incorporated into the power networks, and uses normal control mode；
If the voltage V at described PCCpccWith frequency f at fault traversing region B or C, now join
Grid collapses, the running status of described distributed inversion system is II, and described II is described
Distributed inversion system uses fault traversing control mode, starts timing calculating fault simultaneously and continues
Time t；Described fault traversing region B is that low voltage failure passes through region, described fault traversing district
Territory C is that high voltage fault passes through region；
If the voltage V at described PCCpccWith frequency f at unarmed area D, now power distribution network is sent out
Raw fault, the running status of described distributed inversion system is IV, and described IV is distributed inversion
System is from power distribution network off-the-line, out of service；
When the running status of described distributed inversion system is II, monitor in real time at described PCC
Voltage VpccSituation of change with frequency f, it is judged that:
When described trouble duration t is less than the maximum trouble duration t allowedFRTTime, institute
State the voltage V at PCCpccDescribed normal operating zone A whether is returned to frequency f: if
It is that the running status then switching described distributed inversion system is forwarded to I by II；If it has not, i.e.
V at described PCCpccWith f still in fault traversing region B or C, the most described distributed inversion
The running status of system continues to remain II；
When described trouble duration t is more than or equal to the maximum trouble duration t allowedFRT
Time, the V at described PCCpccWith f still at fault traversing region B or C, then according to described point
Cloth inversion system and the power relation between supply and demand of local load, it is judged that described distributed inversion system
Whether meet islet operation condition:
If it has, then the running status of described distributed inversion system is forwarded to III, described III by II
For described short-term island operation state, the most described distributed inversion system, from power distribution network off-the-line, is adopted
By voltage/frequency control system, power for local based model for load duration, the V at described PCCpccWith
When f recovers to normal operating zone A, described distributed inversion system running status is forwarded to by III
I；
If it has not, the most described distributed inversion system running status is forwarded to IV by II.
In the above-mentioned methods, described islet operation condition is: described distributed inversion system and basis
Need to meet supply and demand power-balance between ground load, and can be that islanded system provides voltage/frequency to prop up
Support.
In the above-mentioned methods, described normal operating zone A is VpccMeet Vl1＜ Vpcc≤Vh1And f is full
Foot fl＜ f≤fh；
It is V that described low voltage failure passes through region BpccMeet Vl2＜ Vpcc≤Vl1And f meets
fl＜ f≤fh；
It is V that described high voltage fault passes through region CpccMeet Vh1＜ Vpcc≤Vh2And f meets
fl＜ f≤fh；
Described unarmed area D is VpccMeet Vpcc＞ Vh2Or Vpcc＜ Vl2, or f meet f ＜ fl
Or f ＞ fh；
Described Vh2And Vh1It is respectively described high pressure and passes through the upper lower limit value of region C voltage, Vl1
And Vl2It is respectively the upper lower limit value of described low-voltage crossing region B voltage, described fhAnd flRespectively
The frequency of region C is passed through for described normal operating zone A, low-voltage crossing region B and high pressure
Upper lower limit value.
In the above-mentioned methods, according to the grid-connected criterion of existing distributed power generation, described Vh2、Vh1、
Vl1、Vl2、fhAnd flThe desirable V of perunit valuel1=0.9；Vl2=0；Vh1=1.1；Vh2=1.2；fl=0.986；
fh=1.01.
In the above-mentioned methods, the described supply and demand power-balance in described islet operation condition include as
Lower two kinds of situations:
a.Pinv≥Pl, now need distributed inversion system is taked certain power extraction strategy,
Make the equilibrium of supply and demand；
b.Pinv＜ Pl, but by carrying out can meeting after certain cutting load controls to local load
The equilibrium of supply and demand；
PinvFor the generated output of distributed inversion system, PlFor local load power.
In the above-mentioned methods, when the running status of described distributed inversion system is III, if
Described distributed inversion system is that multi-inverter parallel runs, in the most described distributed inversion system
The described multi-inverter of parallel running at least must there is an inverter use voltage/frequency to control
Mode provides voltage/frequency to support for islanded system；Typically choose in parallel running inverter and hold
The employing voltage/frequency control mode that amount is maximum.
The isolated island protection being applicable to distributed inversion system provided by the present invention and fault traversing
Coordinated operation method, can coordinate isolated island protection and the fault traversing of distributed inversion system well
Two kinds control function, are possible not only to realize local regenerative resource maximum to the benefit of power distribution network
Change, simultaneously on the premise of ensureing Supply Security, be greatly enhanced the power supply reliability of system,
Be conducive to distributed inversion system based on regenerative resource in power distribution network the most grid-connected.
Accompanying drawing explanation
The present invention has a drawings described below:
Fig. 1 is the distributed inversion system running status change schematic diagram of the present invention.
Fig. 2 is the distributed inversion system operation area schematic diagram of the present invention.
Fig. 3 is the schematic flow sheet of the present invention.
Detailed description of the invention
Below in conjunction with attached Figure 13, the present invention is described in further detail.
1 as it is shown in figure 1, be divided into the running status of distributed inversion system: normally transports
Row, fault traversing run, short-term islet operation and shut down run four kinds, respectively with I, II,
III, IV represent；
2, by the measuring value V of the voltage at PCC and frequencypccAnd f, by distributed inversion system
To be divided into the normal operating zone A shown in Fig. 2, fault traversing operation area (low in operation area
Pressure passes through region B and high pressure passes through region C), unarmed area D, concrete grammar is as follows:
1) if VpccMeet Vl1＜ Vpcc≤Vh1And f meets fl＜ f≤fh, then by this voltage, frequency
The operation area that scope is formed is defined as normal operating zone, represents with A, is called for short region A；
2) if VpccMeet Vl2＜ Vpcc≤Vl1And f meets fl＜ f≤fh, then by this voltage, frequency
The operation area that scope is formed is defined as low-voltage crossing region, represents with B, is called for short region B；
3) if VpccMeet Vh1＜ Vpcc≤Vh2And f meets fl＜ f≤fh, then by this voltage, frequently
The operation area that rate scope is formed is defined as high pressure and passes through region, represents with C, is called for short region C；
Low-voltage crossing region and high pressure are passed through region and is referred to as fault traversing region, usual institute
The fault traversing stated refers to low-voltage crossing, here for considering all situations about being likely to occur, includes
High pressure passes through；
4) if VpccMeet Vpcc＞ Vh2Or Vpcc＜ Vl2, or f meet f ＜ flOr f ＞ fh, then will
The operation area that this voltage, frequency range are formed is defined as unarmed area, represents with D, letter
Claim region D；
Wherein, Vh2And Vh1It is respectively the bound of region C (high pressure passes through region) voltage
Value, Vl1And Vl2It is respectively the upper lower limit value of region B (low-voltage crossing region) voltage, fhWith
flIt is respectively the upper lower limit value of the frequency of region A, B and C, and according to existing distributed power generation
Grid-connected criterion, described Vh2、Vh1、Vl1、Vl2、fhAnd flThe desirable V of perunit valuel1=0.9,
Vl2=0, Vh1=1.1, Vh2=1.2, fl=0.986, fh=1.01.
3 as it is shown on figure 3, detect voltage V at PCCpccWith frequency f, measure according at PCC
Value VpccSituation of change with f, it is judged that operation area, distributed inversion system place (is i.e. run
Region decision), carry out the coordination control of isolated island protection and fault traversing, concrete determination methods is such as
Under:
If the V i) at PCCpccWith f in region A, the running status of distributed inversion system it is
I, distributed inversion system is incorporated into the power networks, and uses normal control mode,；
Ii) if the V at PCCpccWith f at region B or C, then start timing calculating fault and continue
Time t, the control mode simultaneously switching distributed inversion system is fault traversing control, distribution
Formula inversion system enter fault traversing running status, i.e. running status be II (under normal circumstances,
It is to be forwarded to II by I)；
Meanwhile, the V at PCC is monitored in real timepccSituation of change with f, it is judged that allowing
Major break down persistent period tFRT(tFRTWhen continuing for the maximum fault of defined under certain fault degree
Between, concrete value passes through criterion according to dependent failure and isolated island protection regulation is chosen, such as IEEE
1547 etc..(i.e. trouble duration t ＜ t in)FRT), the V at PCCpccWhether recover with f
To region A: if it has, then the control mode switching distributed inversion system controls for normal,
I.e. running status is forwarded to I by II；If it has not, the V at i.e. PCCpccWith f still at region B or C,
Then distributed inversion system is proceeded fault traversing control, i.e. running status and remain II；
As trouble duration t >=tFRTTime, the V at PCCpccWith f still at region B or C, then basis
Distributed inversion system and the power relation between supply and demand of local load, it is judged that distributed inversion system is
No meet islet operation condition: if it has, then distributed inversion system is from grid disconnection, switching
Control mode is voltage/frequency control, and distributed inversion system running status is forwarded to III by II,
When power system restoration is properly functioning, distributed inversion system recover be incorporated into the power networks, running status by
III forwards I to；If it has not, the most distributed inversion system enters isolated island guard mode i.e. running status
Being forwarded to IV by II, distributed inversion system is from grid disconnection, out of service.
Wherein:
1) the islet operation condition of distributed inversion system is: distributed inversion system is with local
Need to meet supply and demand power-balance between load, mainly include two kinds of possible situations:
a.Pinv≥Pl, now need distributed inversion system is taked certain power extraction strategy,
Make the equilibrium of supply and demand；
b.Pinv＜ Pl, but by carrying out can meeting after certain cutting load controls to local load
The equilibrium of supply and demand；
Wherein, PinvFor the generated output of distributed inversion system, PlFor local load power.
2) when the running status of described distributed inversion system is III, if described distributed inverse
Change system is run into multi-inverter parallel, the institute of parallel running in the most described distributed inversion system
State and multi-inverter at least must have an inverter use voltage/frequency control mode to be isolated island system
System provides voltage/frequency to support；Typically choose the employing that in parallel running inverter, capacity is maximum
Voltage/frequency control mode.
Iii) if the V at PCCpccWith f at region D, the operation shape of the most distributed inversion system
State is IV, under normal circumstances for be forwarded to IV by I, the most distributed inversion system from grid disconnection,
Out of service.
The content not being described in detail in this specification belongs to known in professional and technical personnel in the field
Prior art.
Claims (7)
1. the isolated island protection being applicable to distributed inversion system and fault traversing coordinated operation
Method, it is characterised in that: the method be according to PCC at voltage VpccMeasurement with frequency f
The situation of change of value, coordinates isolated island protection and the fault traversing two kinds control of distributed inversion system
Function: when power distribution network breaks down, distributed inversion system preferentially passes through fault traversing for joining
Electrical network provides certain voltage/frequency to support；Institute cannot be realized at described distributed inversion system
When stating fault traversing, in the case of meeting islet operation condition, described distributed inversion system
Powered for local based model for load duration by short-term islet operation；Only the most ungratified in aforementioned condition
In the case of, described distributed inversion system, just from power distribution network off-the-line, is stopped power supply.
The isolated island protection of distributed inversion system the most as claimed in claim 1 and fault traversing
Coordinated operation method, it is characterised in that: the isolated island protection of described distributed inversion system and fault
Pass through coordinated operation method to comprise the steps:
Detect the voltage V at described PCCpccWith frequency f,
If the voltage V at described PCCpccWith frequency f at normal operating zone A, now power distribution network
Properly functioning, the running status of described distributed inversion system is I；Described I is described distribution
Formula inversion system is incorporated into the power networks, and uses normal control mode；
If the voltage V at described PCCpccWith frequency f at fault traversing region B or C, now join
Grid collapses, the running status of described distributed inversion system is II, and described II is described
Distributed inversion system uses fault traversing control mode, starts timing calculating fault simultaneously and continues
Time t；Described fault traversing region B is that low voltage failure passes through region, described fault traversing district
Territory C is that high voltage fault passes through region；
If the voltage V at described PCCpccWith frequency f at unarmed area D, now power distribution network is sent out
Raw fault, the running status of described distributed inversion system is IV, and described IV is distributed inversion
System is from power distribution network off-the-line, out of service；
When the running status of described distributed inversion system is II, monitor in real time at described PCC
Voltage VpccSituation of change with frequency f, it is judged that when described trouble duration t is less than permitting
The maximum trouble duration t permittedFRTTime, the voltage V at described PCCpccThe most extensive with frequency f
Arrive described normal operating zone A again: if it has, then switch the fortune of described distributed inversion system
Row state is forwarded to I by II；If it has not, the V at the most described PCCpccWith f still in fault traversing district
Territory B or C, the running status of the most described distributed inversion system continues to remain II；
When described trouble duration t is more than or equal to the maximum trouble duration t allowedFRT
Time, the V at described PCCpccWith f still at fault traversing region B or C, then according to described point
Cloth inversion system and the power relation between supply and demand of local load, it is judged that described distributed inversion system
Whether meet islet operation condition: if it has, then the running status of described distributed inversion system
Being forwarded to III, described III by II is described short-term island operation state, the most described distributed contravariant system
Unite from power distribution network off-the-line, use voltage/frequency control mode, power for local based model for load duration.
V at described PCCpccWhen recovering to normal operating zone A with f, described distributed inversion
System running state is forwarded to I by III；If it has not, the most described distributed inversion system running status
IV is forwarded to by II.
The isolated island protection of distributed inversion system the most as claimed in claim 2 and fault traversing
Coordinated operation method, it is characterised in that:
When the running status of described distributed inversion system is III, if described distributed contravariant system
Uniting and run for multi-inverter parallel, in the most described distributed inversion system, parallel running is described many
Inverter at least must there is an inverter use voltage/frequency control mode to be that islanded system carries
Voltage supplied/frequency supports.
The isolated island protection of distributed inversion system the most as claimed in claim 2 and fault traversing
Coordinated operation method, it is characterised in that:
Described islet operation condition is: need between described distributed inversion system and local load
Meet supply and demand power-balance, and can be that islanded system provides voltage/frequency to support.
The isolated island protection of distributed inversion system the most as claimed in claim 4 and fault traversing
Coordinated operation method, it is characterised in that:
Described supply and demand power-balance in described islet operation condition includes the following two kinds situation:
a.Pinv≥Pl, now need distributed inversion system is taked certain power extraction strategy,
Make the equilibrium of supply and demand；
b.Pinv＜ Pl, but by carrying out can meeting after certain cutting load controls to local load
The equilibrium of supply and demand；
Wherein, PinvFor the generated output of distributed inversion system, PlFor local load power.
The isolated island protection of distributed inversion system the most as claimed in claim 2 and fault traversing
Coordinated operation method, it is characterised in that:
Described normal operating zone A is VpccMeet Vl1＜ Vpcc≤Vh1And f meets fl＜ f≤fh；
It is V that described low voltage failure passes through region BpccMeet Vl2＜ Vpcc≤Vl1And f meets
fl＜ f≤fh；
It is V that described high voltage fault passes through region CpccMeet Vh1＜ Vpcc≤Vh2And f meets
fl＜ f≤fh；
Described unarmed area D is VpccMeet Vpcc＞ Vh2Or Vpcc＜ Vl2, or f meet f ＜ fl
Or f ＞ fh；
Described Vh2And Vh1It is respectively described high pressure and passes through the upper lower limit value of region C voltage, Vl1
And Vl2It is respectively the upper lower limit value of described low-voltage crossing region B voltage, described fhAnd flRespectively
The frequency of region C is passed through for described normal operating zone A, low-voltage crossing region B and high pressure
Upper lower limit value.
The isolated island protection of distributed inversion system the most as claimed in claim 6 and fault traversing
Coordinated operation method, it is characterised in that:
Described Vh2、Vh1、Vl1、Vl2、fhAnd flPerunit value be respectively Vl1=0.9；Vl2=0；
Vh1=1.1；Vh2=1.2；fl=0.986；fh=1.01.
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| CN112260307A (en) * | 2020-09-27 | 2021-01-22 | 中国电力科学研究院有限公司 | Coordinated operation method for island protection and low-voltage ride through |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112260307A (en) * | 2020-09-27 | 2021-01-22 | 中国电力科学研究院有限公司 | Coordinated operation method for island protection and low-voltage ride through |
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| CN105914786B (en) | 2018-06-22 |
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