CN108899931A - A kind of micro-capacitance sensor low voltage ride through control system - Google Patents
A kind of micro-capacitance sensor low voltage ride through control system Download PDFInfo
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- CN108899931A CN108899931A CN201810865250.XA CN201810865250A CN108899931A CN 108899931 A CN108899931 A CN 108899931A CN 201810865250 A CN201810865250 A CN 201810865250A CN 108899931 A CN108899931 A CN 108899931A
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- 230000005611 electricity Effects 0.000 claims description 2
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- H02J3/383—
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- H02J3/386—
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- H02J3/387—
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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
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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
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A30/00—Adapting or protecting infrastructure or their operation
- Y02A30/60—Planning or developing urban green infrastructure
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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
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/50—Photovoltaic [PV] energy
- Y02E10/56—Power conversion systems, e.g. maximum power point trackers
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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
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/70—Wind energy
- Y02E10/76—Power conversion electric or electronic aspects
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Abstract
The invention proposes a kind of micro-capacitance sensor low voltage crossing fault current management control systems, and the points of common connection between microgrid and public electric wire net uses back-to-back transformer configuration, and the back-to-back converter includes common electrical grid side converter and micro- grid side converter.The fault current management control system, during low voltage crossing, micro-capacitance sensor can effectively neutralize the fault current that public electric wire net injects fault point to the fault current that fault point is injected.The micro-capacitance sensor low voltage ride through control system establishes a kind of microgrid low-voltage traversing topological structure based on back-to-back converter interface, using microgrid low voltage crossing centralized control strategy, make microgrid low voltage crossing that there is higher reliability and flexibility, eliminates influence of the micro-capacitance sensor to the fault current of fault point.
Description
Technical field
The present invention relates to power electronics fields, and in particular to a kind of micro-capacitance sensor low voltage ride through control system.
Background technique
The problems such as to cope with increasingly serious fossil energy shortage and environmental pollution, large-scale develop and utilize renewable new energy
Source becomes effective solution.Distributed generation unit, such as photovoltaic (PV) array, wind-power electricity generation (WT), fuel cell (FC), micro-
Type gas turbine (MT) and energy-storage system (ESS) are widely accessed public electric wire net in the form of microgrid.Have benefited from power electronics
The development of technology, microgrid provide highly reliable and high quality electric energy for public electric wire net.
In general, operating in for microgrid has grid-connect mode and island mode in dispatching of power netwoks plan, with corresponding different
Running environment and user demand.When the grid collapses, the voltage of microgrid access point can reduce, and microgrid is caused to enter non-meter
Island mode is drawn, i.e., enters a kind of state of isolated operation without dispatching of power netwoks.At this point, the control centre of power grid is not aware that
Microgrid comes into isolated operation, but still referring to the operation plan of grid-connect mode, this will lead to public electric wire net and microgrid
Security risk.Therefore, it is necessary to allow microgrid to have the ability of low voltage crossing (LVRT), i.e., Voltage Drop should be sent out in electric network fault
In the case of, the ability that makes microgrid that can still be incorporated into the power networks.The reason of realizing micro-capacitance sensor low voltage crossing mainly has：
1) unplanned isolated operation capacity caused by public electric wire net of being gradually increased with microgrid permeability, microgrid lacks
Mistake can not be ignored, and cause the failure of dispatching of power netwoks plan；
2) the unplanned isolated operation of microgrid will cause the further deterioration of common voltage voltage and frequency；
3) the unplanned isolated operation of microgrid will cause the waste of electric energy if the electric energy that microgrid generates is needed more than itself,
Also, microgrid energy-storage system can be completely charged；
4) the unplanned isolated operation of microgrid can cause microgrid to supply if the electric energy that microgrid generates is unable to satisfy itself needs
It is electric insufficient, lead to critical load power down；
5) microgrid grid-connected process again, may cause stationary problem and excessive surge current problem.
Therefore, the ability for increasingly requiring microgrid to have low voltage crossing.
However, low voltage crossing is concentrated mainly on large-sized photovoltaic power station and wind power plant at present, to the low voltage crossing of microgrid
It is relatively fewer.For example, what the low voltage crossing of photovoltaic plant was mainly realized by the output current control of power grid interaction converter,
Such as the reactive current injecting strategy of single-phase photovoltaic inverter, the negative-sequence current injecting strategy of three-phase photovoltaic inverter.Wind power plant
Low voltage crossing is usually to export current control by three-phase to realize, inhibits the 100HZ oscillation of power of grid side current transformer,
Such as flexible voltage support policy, demagnetization and virtual resistance integrated control strategy.And the research to the low voltage crossing of microgrid at present
The method for being only limitted to sagging control.In contrast, the low voltage crossing of microgrid is badly in need of further development and research.
In general, electro-mechanical circuit interrupter and solid-state switch (STS) can be used in the PCC connecting interface between microgrid and public electric wire net
To realize.It is needed to each distributed generation unit decentralised control in microgrid, such as based on distributed generation unit negative phase-sequence
The micro-capacitance sensor low voltage crossing of sagging control.Since each distributed generation unit needs to control one by one, control strategy is caused to become
Must be complicated, for example, it is desired to consider the coordination optimization and loop current suppression between each distributed generation unit.Meanwhile the program is simultaneously
Do not consider that fault current management controls, during low voltage crossing, sharply increasing for fault point fault current can be caused, cause to pacify
Full hidden danger；And it is voltage mode control, control loop is more, reduces the dynamic property and steady-state performance of low voltage crossing.
In conclusion be badly in need of study it is a kind of based on fault current management strategy micro-capacitance sensor low voltage crossing control be
System.
Summary of the invention
The technical problem to be solved by the present invention is to：A kind of micro-capacitance sensor low voltage ride through control system is provided, microgrid is made
For the low voltage crossing centralized control of an entirety, make microgrid low voltage crossing that there is higher reliability and flexibility.
The present invention provides a kind of fault current management and controlling tactics, and micro-capacitance sensor can have the fault current that fault point is injected
The fault current that public electric wire net injects fault point is offset on effect ground, eliminates influence of the micro-capacitance sensor to fault point fault current.
The present invention proposes a kind of micro-capacitance sensor low voltage ride through control system, commonly connected between microgrid and public electric wire net
Point uses back-to-back transformer configuration, and the back-to-back converter includes common electrical grid side converter and micro- grid side converter.
Another technical solution of the invention be it is above-mentioned basis on, active power and idle function in the control system
Rate energy two-way flow, wherein microgrid low voltage crossing injection reactive current be：
Wherein,Reference value, U are injected for reactive currentgFor electric network fault voltage, UNFor power grid normal voltage, INFor inversion
Device name-plate current, kqAdjustment factor is injected for reactive current.
Another technical solution of the invention is that on above-mentioned basis, microgrid low voltage crossing is infused in the control system
The watt current entered is：
Wherein,Reference value, U are injected for watt currentgFor electric network fault voltage, UNFor power grid normal voltage, INFor inversion
Device name-plate current, kpAdjustment factor is injected for watt current.
Another technical solution of the invention be it is above-mentioned basis on, the current control of the common electrical grid side converter
Strategy is：
Wherein,WithRespectively active power and reactive power are at rotating coordinate system (α β)
The reference value of current component,Respectively positive sequence/negative phase-sequence active power, the adjusting of positive sequence/negative phase-sequence reactive power
Coefficient, R/X are line impedance ratio,WithRespectively point of the positive sequence/negative sequence voltage at rotating coordinate system (α β)
Amount, P*And Q*Respectively active power and reactive power reference qref.
Another technical solution of the invention is that on above-mentioned basis, inverter output is electric at rotating coordinate system (α β)
Stream is：
Wherein,Respectively component of the inverter output current at rotating coordinate system (α β).
Another technical solution of the invention is that on above-mentioned basis, the common electrical grid side converter exports electric current
FCPLM (fault current peak limit management) control strategy is：
In formula,Respectively component of the inverter output current under abc coordinate system,Peak is exported for inverter
It is worth electric current.
Another technical solution of the invention is that on above-mentioned basis, the common electrical grid side converter exports electric current
FCPLM (fault current phase angle management) control strategy is：
In formula, θm_f_newFault current, which is exported, for microgrid it is expected new angle, θg_fThe angle of fault current is injected for public electric wire net
Degree,The amplitude of fault current is injected for microgrid,The amplitude of fault current is injected for public electric wire net.
Another technical solution of the invention is that on above-mentioned basis, microgrid side transducer side exports current control
Strategy is：
Wherein,WithRespectively microgrid side transducer side inverter output current, umαAnd umβFor micro- grid side converter
Component of the side inverter voltage at rotating coordinate system (α β), PrefAnd QrefRespectively transducer side inverter in microgrid side exchanges function
Rate.
Beneficial effects of the present invention：
Micro-capacitance sensor low voltage ride through control system of the present invention, the points of common connection between microgrid and public electric wire net
Using back-to-back transformer configuration, the back-to-back converter includes common electrical grid side converter and micro- grid side converter.It is described
Micro-capacitance sensor low voltage ride through control system establishes a kind of microgrid low voltage crossing topology knot based on back-to-back converter interface
Structure makes microgrid low voltage crossing have higher reliability and flexibility using microgrid low voltage crossing centralized control strategy.Separately
Outside, the microgrid fault current peak value management strategy (FCPLM) for also using active power and reactive power flexibly to control is realized micro-
The peak value of net low voltage crossing the output of process fault current limits.Moreover, it also uses microgrid and public electric wire net fault current phase
The complementary microgrid fault current phase management strategy (FCPAM) in position, realizes microgrid low voltage crossing the output of process fault current pair
System total failare electric current zero purpose influenced in amplitude.
Detailed description of the invention
The attached drawing for constituting a part of the invention is used to provide further understanding of the present invention, schematic reality of the invention
It applies example and its explanation is used to explain the present invention, do not constitute improper limitations of the present invention.
Fig. 1 is a kind of circuit structure topological diagram of microgrid low voltage crossing in the prior art；
Fig. 2 is the circuit structure topological diagram for the microgrid low voltage crossing that one embodiment of the present invention is related to；
Fig. 3 is the microgrid low voltage crossing control strategy figure that one embodiment of the present invention is related to.
Specific embodiment
Present invention will now be described in detail with reference to the accompanying drawings., the description of this part be only it is exemplary and explanatory, do not answer
There is any restriction effect to protection scope of the present invention.In addition, description of the those skilled in the art according to this document, it can be right
Feature in this document in embodiment and in different embodiments carries out the corresponding combination.
Description and claims of this specification and term " first ", " second ", " third " " in above-mentioned attached drawing
The (if present)s such as four " are to be used to distinguish similar objects, without being used to describe a particular order or precedence order.It should manage
The data that solution uses in this way are interchangeable under appropriate circumstances, so as to the embodiment of the present invention described herein, such as can be with
Sequence other than those of illustrating or describing herein is implemented.In addition, term " includes " and " having " and their times
What is deformed, it is intended that cover it is non-exclusive include, for example, contain the process, method of a series of steps or units, system,
Product or equipment those of are not necessarily limited to be clearly listed step or unit, but may include be not clearly listed or for
The intrinsic other step or units of these process, methods, product or equipment.
As shown in Figure 1, mainly being used down for a kind of circuit structure topological diagram of microgrid low voltage crossing in the prior art
Hang down control strategy, and using the connecting interface structure of solid-state switch (STS).Each distributed generation unit of microgrid is adopted respectively
With positive sequence/negative phase-sequence it is sagging control to public electric wire net inject positive and negative/negative phase-sequence it is active/reactive power, compensate PCC point voltage, realize it is micro-
The low voltage crossing of net is run.Each distributed generation unit low voltage crossing is implemented as one two layers point inside microgrid
Grade control.First layer control includes electric current loop, Voltage loop and virtual impedance control, and second layer control is positive and negative and negative phase-sequence wattful power
Rate and the sagging control of reactive power.The active power and reactive power support that low voltage crossing needs are realized, so that microgrid be made to have
The ability of standby low voltage crossing.It, which exists, needs to carry out decentralised control, the dispersion to each distributed generation unit in microgrid inside
Control can cause coordination optimization and circulation problem during low voltage crossing；And do not consider that fault current management controls, it is low
During voltage ride-through, the problem of sharply increasing, cause security risk of fault point fault current can be caused；In addition the program is
Voltage mode control, control loop is more, reduces the dynamic property and steady-state performance of low voltage crossing.
The embodiment of the present invention is as follows, refers to Fig. 2, a kind of micro-capacitance sensor low voltage ride through control system, microgrid with it is public
For points of common connection between power grid using back-to-back (BTB) transformer configuration, the back-to-back converter includes common electrical net side
Converter and micro- grid side converter.Wherein, Rs,LsAnd Rl,LlRespectively indicate the route of public electric wire net and microgrid apart from power grid bus
Impedance.Ig_f,Im_fAnd θg_f,θm_fRespectively indicate public electric wire net and amplitude from microgrid to fault branch injection fault current and phase
Position.It_fAnd θt_fRespectively indicate the amplitude and phase of fault branch total failare electric current.(BTB) converter is divided into common electrical back-to-back
Grid side converter (GSC) and micro- grid side converter (MSC).
Points of common connection (PCC) between microgrid and public electric wire net uses back-to-back transformer configuration, can be good at every
From between microgrid and public electric wire net voltage fluctuation and frequency disturbance, be provided simultaneously with the bidirectional flow of active power and reactive power
It is dynamic.Preferably, the reactive current of microgrid low voltage crossing injection is：
Wherein,Reference value, U are injected for reactive currentgFor electric network fault voltage, UNFor power grid normal voltage, INFor inversion
Device name-plate current, kqAdjustment factor is injected for reactive current.
The watt current of microgrid low voltage crossing injection is in the control system：
Wherein,Reference value, U are injected for watt currentgFor electric network fault voltage, UNFor power grid normal voltage, INFor inversion
Device name-plate current, kpAdjustment factor is injected for watt current.
Preferably, the Current Control Strategy of the common electrical grid side converter is：
Wherein,WithRespectively active power and reactive power are at rotating coordinate system (α β)
The reference value of current component,Respectively positive sequence/negative phase-sequence active power, the adjusting of positive sequence/negative phase-sequence reactive power
Coefficient, R/X are line impedance ratio,WithRespectively point of the positive sequence/negative sequence voltage at rotating coordinate system (α β)
Amount, P*And Q*Respectively active power and reactive power reference qref.
Preferably, inverter output current is at rotating coordinate system (α β)：
Wherein,Respectively component of the inverter output current at rotating coordinate system (α β).
Preferably, the FCPLM control strategy of the common electrical grid side converter output electric current is：
In formula,Respectively component of the inverter output current under abc coordinate system,Peak is exported for inverter
It is worth electric current.
Preferably, the FCPLM control strategy of the common electrical grid side converter output electric current is：
In formula, θm_f_newFault current, which is exported, for microgrid it is expected new angle, θg_F is the angle that public electric wire net injects fault current
Degree,The amplitude of fault current is injected for microgrid,The amplitude of fault current is injected for public electric wire net.
Preferably, microgrid side transducer side output Current Control Strategy is：
Wherein,WithRespectively microgrid side transducer side inverter output current, umαAnd umβFor micro- grid side converter
Component of the side inverter voltage at rotating coordinate system (α β), PrefAnd QrefRespectively transducer side inverter in microgrid side exchanges function
Rate.
As shown in figure 3, being the complete control program of micro-capacitance sensor low voltage ride through control system of the present invention.
Beneficial effects of the present invention：
Micro-capacitance sensor low voltage ride through control system of the present invention, the points of common connection between microgrid and public electric wire net
Using back-to-back transformer configuration, the back-to-back converter includes common electrical grid side converter and micro- grid side converter.It is described
Micro-capacitance sensor low voltage ride through control system establishes a kind of microgrid low voltage crossing topology knot based on back-to-back converter interface
Structure makes microgrid low voltage crossing have higher reliability and flexibility using microgrid low voltage crossing centralized control strategy.It is real
Existing microgrid low voltage crossing, avoids the unplanned isolated operation of microgrid, guarantees Power Exchange and warp between microgrid and public electric wire net
Ji optimizes.In addition, it is based on microgrid fault current phase management strategy (FCPAM), microgrid low voltage crossing basis is being realized
On, make microgrid fault current to the influence zero of fault branch total failare electric current, prevent error protection failure, ensures power grid security
Reliability service.Moreover, also using microgrid fault current peak value management strategy (FCPLM), microgrid low voltage crossing basis is being realized
On, have microgrid output fault current peak value rejection ability, prevents back-to-back converter from causing to trip because fault current is out-of-limit.
The above is only a preferred embodiment of the present invention, it is noted that for the ordinary skill people of the art
For member, various improvements and modifications may be made without departing from the principle of the present invention, these improvements and modifications are also answered
It is considered as protection scope of the present invention.
Claims (8)
1. a kind of micro-capacitance sensor low voltage ride through control system, it is characterised in that：Points of common connection between microgrid and public electric wire net
Using back-to-back transformer configuration, the back-to-back converter includes common electrical grid side converter and micro- grid side converter, is passed through
Fault current management eliminates micro-capacitance sensor during low voltage crossing to the influence of the fault current of fault point.
2. micro-capacitance sensor low voltage ride through control system according to claim 1, which is characterized in that have in the control system
Function power and reactive power energy two-way flow, wherein microgrid low voltage crossing injection reactive current be：
Wherein,Reference value, U are injected for reactive currentgFor electric network fault voltage, UNFor power grid normal voltage, INFor inverter inscription
Board electric current, kqAdjustment factor is injected for reactive current.
3. micro-capacitance sensor low voltage ride through control system according to claim 2, which is characterized in that micro- in the control system
Net low voltage crossing injection watt current be：
Wherein,Reference value, U are injected for watt currentgFor electric network fault voltage, UNFor power grid normal voltage, INFor inverter inscription
Board electric current, kpAdjustment factor is injected for watt current.
4. micro-capacitance sensor low voltage ride through control system according to any one of claim 1 to 3, which is characterized in that described
The Current Control Strategy of common electrical grid side converter is：
Wherein,WithThe respectively electric current of active power and reactive power at rotating coordinate system (α β) point
The reference value of amount,Respectively positive sequence/negative phase-sequence active power, positive sequence/negative phase-sequence reactive power adjustment factor,
R/X is line impedance ratio,WithRespectively component of the positive sequence/negative sequence voltage at rotating coordinate system (α β), P*With
Q*Respectively active power and reactive power reference qref.
5. micro-capacitance sensor low voltage ride through control system according to claim 4, which is characterized in that at rotating coordinate system (α β)
Lower inverter output current is：
Wherein,Respectively component of the inverter output current at rotating coordinate system (α β).
6. micro-capacitance sensor low voltage ride through control system according to claim 5, which is characterized in that the common electrical net side becomes
Parallel operation output electric current FCPLM control strategy be：
In formula,Respectively component of the inverter output current under abc coordinate system,Peak value electricity is exported for inverter
Stream.
7. micro-capacitance sensor low voltage ride through control system according to claim 1, which is characterized in that the common electrical net side becomes
Parallel operation output electric current FCPLM control strategy be：
In formula, θm_f_newFault current expected angle, θ are exported for microgridg_fThe angle of fault current is injected for public electric wire net,
The amplitude of fault current is injected for microgrid,The amplitude of fault current is injected for public electric wire net.
8. micro-capacitance sensor low voltage ride through control system according to claim 1, which is characterized in that micro- grid side converter
Side exports Current Control Strategy：
Wherein,WithRespectively microgrid side transducer side inverter output current, umαAnd umβFor the transducer side inversion of microgrid side
Component of the device voltage at rotating coordinate system (α β), PrefAnd QrefRespectively transducer side inverter in microgrid side exchanges power.
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|---|---|
| CN108899931B (en) | 2021-09-17 |
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