CN107437821A - Isolated island micro-capacitance sensor virtual machine differentiation fault traversing system and its implementation - Google Patents
Isolated island micro-capacitance sensor virtual machine differentiation fault traversing system and its implementation Download PDFInfo
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- CN107437821A CN107437821A CN201710820837.4A CN201710820837A CN107437821A CN 107437821 A CN107437821 A CN 107437821A CN 201710820837 A CN201710820837 A CN 201710820837A CN 107437821 A CN107437821 A CN 107437821A
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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
- H02J3/381—Dispersed generators
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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
- H02J3/46—Controlling of the sharing of output between the generators, converters, or transformers
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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 a kind of isolated island micro-capacitance sensor virtual machine differentiation fault traversing system and its implementation, is made up of current transformer output voltage and current acquisition module, fault detect and judge module, virtual synchronous control module and differentiation fault traversing control module；Current transformer output voltage and the both ends of filter capacitor voltage and filter inductance electric current of current acquisition module detection current transformer output, and virtual synchronous control module, fault detect and judge module and differentiation fault traversing control module are fed back to respectively；Fault detect judges whether current transformer failure occurs and detect fault degree with judge module；The fault traversing for realizing isolated island micro-capacitance sensor virtual machine using differentiation fault traversing control module controls.Dash current protection current transformer can be limited during failure; maintain micro-capacitance sensor frequency stable simultaneously; ensure isolated island micro-capacitance sensor safe operation during short trouble, solve protection converter device in existing failure process and safeguard the contradiction between two kinds of demands of micro-capacitance sensor stable operation.
Description
Technical field
The invention belongs to micro-capacitance sensor Fault Control technical field, is related to a kind of isolated island micro-capacitance sensor virtual machine differentiation failure and wears
More system and its implementation.
Background technology
Distributed power source based on wind energy, solar energy largely accesses power distribution network, improve power distribution network the quality of power supply and
Power supply reliability, but the trend complexity of distribution net side is also added simultaneously.Micro-capacitance sensor conduct can effectively integrate distributed energy
Source, load, the system of energy storage device and electric automobile get the attention and promoted in recent years.In micro-capacitance sensor, distribution
The formula energy is accessed often through converter device to realize electric energy flexible transformation and improve controllability.Wherein, with voltage-controlled type
Converter device plays irreplaceable effect as the distributed energy of interface in the support of voltage and frequency, especially exists
Under the conditions of isolated island.
Common voltage control mode has constant voltage constant frequency control and droop control.Constant voltage constant frequency control energy under the conditions of isolated island
The voltage and frequency of enough systems stabilisations, ensure the preferable quality of power supply, but higher to the capacity requirement of current transformer.Possess automatic
The droop control current transformer of distribution load characteristic can maintain the stabilization of micro-capacitance sensor voltage and frequency, and and can realizes load sharing.
But droop control is more strict to circuit resistance sense characteristic requirements, presents and generally required in resistive secondary network additionally in circuit
Control deacclimatize.In recent years, inverter-virtual machine of synchronous motor electromagnetic property and rotational characteristic is simulated from control, by
Turn into study hotspot in stronger adaptability and power network friendly.But converter device is compared to the hot excessively stream of synchronous generator
Ability is poor, and caused dash current is most likely to damage power device during short trouble, brings safety problem.Cause
This, protects current transformer to turn into a kind of important means during failure by switching control.
Controlled for common voltage, for some existing suppressing methods of failure dash current, propose that one kind is fallen according to voltage
Fall the current-limiting mode of amplitude size increase virtual impedance, so as to ensure that droop control device being capable of fault restriction electricity in transient process
Stream.But when near-end breaks down (Voltage Drop amplitude is deeper), increased virtual impedance reaches higher limit, it is difficult to effectively limit
Dash current processed.By directly controlling modulation wave voltage effectively to control output current of converter in failure.It is but this
Mode heavy dependence is communicated, and hidden danger is brought to system reliability.In addition, common voltage control in current inner loop current limiter
Certain restriction effect can be played to dash current caused by short trouble.
There is even more serious dash current in virtual machine, and lack current limit in virtual synchronous control in short-circuit process
Device, dash current can not be limited by original control.According to conventional voltage control type current transformer fault traversing mode, propose a kind of
Low voltage traversing control method based on mode smooth switching under grid-connect mode.This method switches to electric current using conventional low voltage
The method fault current limiting of control, and can take over seamlessly to virtual synchronous and control after failure removal.But this method
Voltage-controlled type current transformer fault current composition is not analyzed, current-limiting method lack of targeted.Switch to current control
Current transformer can not provide voltage and be supported with frequency so that the micro-capacitance sensor in transient process becomes more fragile, even results in system
Unstability.
Limiter in this body controller of current transformer has certain limitation to make for the output current of current transformer between age at failure
With, however this limitation for current transformer power output can not active control, and be also easy to produce impact in the fault recovery stage.It is existing
The control of active low voltage crossing, which mainly has, is directly switch into Direct Current Control or directly two kinds of sides of control current transformer built-in potential
Method.Switch to Direct Current Control can fast control current, but can not supporting network frequency；Directly control current transformer built-in potential
Communication delay be present, to dash current rejection ability difference the shortcomings of.
The content of the invention
To achieve the above object, the present invention provides a kind of isolated island micro-capacitance sensor virtual machine differentiation fault traversing system, in event
Dash current protection current transformer can be limited during barrier, while maintains micro-capacitance sensor frequency stable, ensures that isolated island is micro- during short trouble
Electric power netting safe running, solve in existing failure process protect converter device and safeguard two kinds of demands of micro-capacitance sensor stable operation it
Between contradiction.
It is another object of the invention to provide a kind of realization side of isolated island micro-capacitance sensor virtual machine differentiation fault traversing system
Method.
The technical solution adopted in the present invention is a kind of isolated island micro-capacitance sensor virtual machine differentiation fault traversing system, by becoming
Stream device output voltage is worn with current acquisition module, fault detect and judge module, virtual synchronous control module and differentiation failure
More control module forms；Wherein,
The current transformer output voltage and current acquisition module, for detecting the both ends of filter capacitor voltage of current transformer output
With filter inductance electric current, and the voltage and current of detection is fed back into virtual synchronous control module, fault detect and judgement respectively
Module and differentiation fault traversing control module；
The fault detect and judge module, for judging whether current transformer failure occurs and detect fault degree；
The virtual synchronous control module, output control during for realizing current transformer normal operation；
The differentiation fault traversing control module, for realizing that the fault traversing of isolated island micro-capacitance sensor virtual machine controls, by
Quick current-limiting control module forms with virtual impedance current limit control module, wherein, the quick current-limiting control module, for realizing
The control of current transformer fault current limiting when fault degree is serious；The virtual impedance current limit control module, for realizing failure
The control of current transformer fault current limiting when degree is shallower.
Another technical scheme of the present invention is, a kind of isolated island micro-capacitance sensor virtual machine differentiation fault traversing system
Implementation method, specifically follow the steps below：
Step 1, the both ends of filter capacitor voltage of current transformer output voltage and current acquisition module detection current transformer output and
Filter inductance electric current, and the voltage and current of detection is fed back into virtual synchronous control module, fault detect respectively and judges mould
Block and differentiation fault traversing control module；
Step 2, fault detect judges whether current transformer failure occurs and detect fault degree with judge module；When not occurring
During failure, output control when realizing current transformer normal operation using virtual synchronous control module；
Step 3, when breaking down, and when fault degree is serious, realize that current transformer limits using quick current-limiting control module
The control of fault current；When breaking down, and when fault degree is shallower, current transformer is realized using virtual impedance current limit control module
The control of fault current limiting.
Further, the fault detect and judge module, with the both ends of filter capacitor voltage and filtered electrical of current transformer output
Inducing current signal is input, current signal instantaneous value is compared with the current protection value set, when current signal instantaneous value is small
When current protection value, algorithm changeover switch connection virtual synchronous control module；When current signal instantaneous value is more than electricity
When flowing protection value, output control switching signal, current transformer switches into differentiation fault traversing control module, meanwhile, failure inspection
Survey and judge module judges current transformer failure drop depth according to the size of current transformer port voltage signal, when current transformer voltage falls
Fall depth and be more than or equal to set threshold values, algorithm changeover switch connection quick current-limiting control module；When current transformer Voltage Drop is deep
Degree is less than set threshold values, algorithm changeover switch connection virtual impedance current limit control module.
Further, the virtual synchronous control module, with output current of converter signal isTo input, with now three-phase
Voltage reference value is voltage, the voltage and electric current isThe power input being multiplied as virtual synchronous control module, with active power
Reference value P*With rated angular velocity ω*Business TmMake comparisons, tabs receive under the active inertia in the virtual synchronous control module
Inertia calculating and sagging calculating are carried out after active power input, obtains reference wave angular velocity omega, while to reference wave angular velocity omega
Integrated, obtain the phase angle θ of reference wave；Tabs receive idle work(under idle inertia in the virtual synchronous control module
Rate input after with rated reactive power Q*Compare, and carry out inertia and sagging calculating, obtain virtual excitation Mfif, virtual excitation Mfif
It is multiplied by reference wave angular velocity omega and obtains the amplitude of output signal, the amplitude is multiplied by the sine value of the phase angle θ of reference wave as empty
Intend the output of synchronization control module, complete output control during current transformer normal operation.
Further, the quick current-limiting control module, the voltage-phase θ for detecting points of common connection add phase shifting angleWith
IsetThree-phase current reference value i is produced as reference current amplitudeabcref, with current transformer output three-phase current iabcIt is poor to make, by stagnant
Ring control module produces opening and turning off for drive signal control IGBT switching devices, so as to realize to current transformer fault current
Limitation.
Further, the virtual impedance current limit control module, the modulation voltage exported with virtual synchronous control module
Vref abcTo input, by modulation voltage Vref abcWith current transformer output three-phase current iabcIn virtual impedance ZvPressure drop is made caused by upper
Difference, after eliminating high-frequency harmonic by low pass filter LPF, SPWM modulation is carried out, driving IGBT switching devices being opened and closing
It is disconnected, so as to realize that the failure current limit of current transformer controls.
The invention has the advantages that the present invention for the hot conveyance capacity difference band of current transformer come failure process be easy to burn
And isolated island micro-capacitance sensor frequency the characteristic such as supports by voltage-controlled type current transformer, by detecting each current transformer port in micro-capacitance sensor
Voltage Drop depth and output current size, judge that current transformer needs the low-voltage crossing control mode used, i.e., according to unsteady flow
Device malfunction selects suitable fault traversing control mode, so as to realize the safety and stability of isolated island micro-capacitance sensor in failure conditions
Operation.When micro-capacitance sensor breaks down, fall deeper failure near-end current transformer for port voltage, switch to quick current-limiting control
System, quick current-limiting control module is fed back to by output current, and the quick control to dash current is realized using Hysteresis control module,
Reasonable distribution output current simultaneously, micro-capacitance sensor voltage is supported, suppress dash current, protect current transformer；Fall for port voltage
Shallower failure distal end current transformer, switches to virtual impedance Current limited Control, and output current value is fed back into virtual impedance current limliting control
Molding block, by modulation voltage Vref abcWith current transformer output three-phase current iabcIn virtual impedance ZvPressure drop is made poor caused by upper, enters
Row SPWM is modulated, and driving IGBT switching devices being opened and turning off, and so as to limiting short-circuit current, while provides frequency for micro-capacitance sensor
Support.The present invention ensures the stability and security operation of whole micro-capacitance sensor in failure process, and realizing should prevent dash current can
The device damage that can be brought, keeps the voltage of micro-capacitance sensor and being actually needed for frequency stabilization again.
Brief description of the drawings
In order to illustrate more clearly about the embodiment of the present invention or technical scheme of the prior art, below will be to embodiment or existing
There is the required accompanying drawing used in technology description to be briefly described, it should be apparent that, drawings in the following description are only this
Some embodiments of invention, for those of ordinary skill in the art, on the premise of not paying creative work, can be with
Other accompanying drawings are obtained according to these accompanying drawings.
Fig. 1 is isolated island microgrid topology structure figure of the embodiment of the present invention.
Fig. 2 is virtual synchronous of embodiment of the present invention control realization figure.
Fig. 3 is quick current-limiting of embodiment of the present invention control realization figure.
Fig. 4 is virtual impedance Current limited Control realization figure of the embodiment of the present invention.
Fig. 5 is differentiation of embodiment of the present invention fault traversing control realization figure.
Fig. 6 is SPWM modulation principle figures of the embodiment of the present invention.
Fig. 7 a are the output current variation diagrams using current transformer DG1 after differentiation fault traversing system of the present invention control.
Fig. 7 b are the output current variation diagrams using current transformer DG2 after differentiation fault traversing system of the present invention control.
Fig. 7 c are the output current variation diagrams using current transformer DG3 after differentiation fault traversing system of the present invention control.
Fig. 7 d are the frequency oscillograms using common bus after differentiation fault traversing system of the present invention control.
Fig. 7 e are the voltage change figures using common bus after differentiation fault traversing system of the present invention control.
In figure, 1. virtual synchronous control modules, 2. virtual impedance current limit control modules, 3. quick current-limiting control modules, 4.
Hysteresis control module, 5. low pass filter LPF, 6. fault detects and judge module, 7. differentiation fault traversing control modules,
8.PLL phase-locked loop modules.
Embodiment
Below in conjunction with the drawings and specific embodiments, the present invention is further elaborated.It should be appreciated that the embodiment
The present invention is merely to illustrate, rather than is limited the scope of the invention.In addition, it is to be understood that reading of the invention describe
After content, those skilled in the art can make various changes or modification to the present invention, and these equivalent form of values equally fall within this Shen
The protection domain please limited.
Isolated island micro-capacitance sensor virtual machine differentiation fault traversing system is by current transformer output voltage and current acquisition module, failure
Detection forms with judge module 6, virtual synchronous control module 1 and differentiation fault traversing control module 7；Wherein,
Current transformer output voltage and current acquisition module, for detecting both ends of filter capacitor voltage and the filter of current transformer output
Ripple inductive current, and the voltage and current of detection is fed back into virtual synchronous control module 1, fault detect and judge module respectively
6 and differentiation fault traversing control module 7；
Fault detect and judge module 6, for judging whether current transformer failure occurs and detect fault degree；
Virtual synchronous control module 1, output control during for realizing current transformer normal operation；
Differentiation fault traversing control module 7, for realizing that the fault traversing of isolated island micro-capacitance sensor virtual machine controls, by quick
Current limit control module 3 forms with virtual impedance current limit control module 2, wherein, the quick current-limiting control module 3, for realizing
The control of current transformer fault current limiting when fault degree is serious；The virtual impedance current limit control module 2, for realizing failure
The control of current transformer fault current limiting when degree is shallower.
The implementation method of isolated island micro-capacitance sensor virtual machine differentiation fault traversing system, is specifically followed the steps below：
Step 1, the both ends of filter capacitor voltage of current transformer output voltage and current acquisition module detection current transformer output and
Filter inductance electric current, and the voltage and current of detection is fed back into virtual synchronous control module 1, fault detect respectively and judges mould
Block 6 and differentiation fault traversing control module 7；
Step 2, fault detect judges whether current transformer failure occurs and detect fault degree with judge module 6；When not sending out
During raw failure, output control when realizing current transformer normal operation using virtual synchronous control module 1；
Step 3, when breaking down, and when fault degree is serious, realize that current transformer limits using quick current-limiting control module 3
The control of fault current；When breaking down, and when fault degree is shallower, unsteady flow is realized using virtual impedance current limit control module 2
The control of device fault current limiting.
The isolated island microgrid topology structure of the embodiment of the present invention, as shown in figure 1, including current transformer DG1, current transformer DG2, becoming
Flow device DG3 and load, current transformer DG1 and LC wave filters ZLC1Connection, current transformer DG2 and LC wave filters ZLC2Connection, current transformer
DG3 and LC wave filters ZLC3Connection, current transformer DG1, current transformer DG3 are simulated by transmission line of electricity line1, line3 to power network respectively
Three-phase ground short trouble impedance ZgPower supply；Current transformer DG2 is by transmission line of electricity line2 to load impedance ZloadPower supply；Power transmission line
Road line1, line2 and line3 are connected with bus Bus.
Each current transformer include main circuit, current transformer output voltage and current acquisition module, virtual synchronous control module 1 with
And drive module；Current transformer output voltage gathers three current transformer output filter capacitor both end voltages respectively with current acquisition module
With filter inductance electric current, and be sent to virtual synchronous control module 1, realize virtual synchronous control under normal running (operation) conditions and
Differentiation fault traversing control under fault condition, and drive signal is reached into hardware driving circuit, controlling switch device is opened
It is disconnected, realize transformation of electrical energy.
The virtual synchronous control of the embodiment of the present invention, as shown in Fig. 2 formula (1) is as follows,
In above formula, TeFor virtual machine virtual electromagnetic torque, Q represents virtual machine output reactive power, and e controls for virtual synchronous
Modulation WAVE VOLTAGE AMPLITUDE VALUES, M caused by algorithmfifFor Virtual shipyard, ω is virtual machine angular speed, and i represents virtual machine output current, θ
It is virtual machine phase angle.Virtual synchronous control module 1 is with output current of converter signal isFor input, referred to now three-phase voltage
It is worth for voltage, the voltage and electric current isBe multiplied as virtual synchronous control module 1 power input and with active power reference value P*
With rated angular velocity ω*Business TmMake comparisons, then tabs receive active power under the active inertia in virtual synchronous control module
Inertia calculating and sagging calculating are carried out after input, obtains reference wave angular velocity omega, while reference wave angular velocity omega is integrated,
Obtain the phase angle θ of reference wave；Under idle inertia in virtual synchronous control module 1 tabs receive reactive power input after with volume
Determine reactive power Q*Compare, and carry out inertia and sagging calculating, obtain virtual excitation Mfif, virtual excitation MfifIt is multiplied by and refers to wave angle
Speed omega obtains the amplitude of output signal, and finally, the amplitude is multiplied by the sine value of the phase angle θ of reference wave as virtual synchronous control
The output of molding block, complete output control during current transformer normal operation.K in Fig. 2s、JsRespectively idle ring and active ring integration are normal
Number, DpWith DqIt is active ring and the sagging coefficient of idle ring respectively, E*It is Voltage Reference amplitude and virtual machine output voltage respectively with E
Amplitude, △ T are Virtual Torque offsets.
Current transformer DG1, current transformer DG2 and current transformer DG3 incoming transport buses power to the load jointly in micro-capacitance sensor.Using
Three current transformers can ensure the generality of the present embodiment micro-capacitance sensor structure to load power supply jointly, while fully demonstrate this implementation
Isolated island micro-capacitance sensor a variety of transient response processes when short trouble occurs in example.Current transformer DG1, DG2 and DG3 structure include direct current
Micro- source and the DC/AC converters for carrying out transformation of electrical energy.Wherein it is straight to include but is not limited to energy-storage battery, photovoltaic panel etc. for the micro- source of direct current
Flow form of power source.DC supply input is transformed to exchange by DC/AC converters and is electrically accessed common bus, can ensure higher electricity
Can quality and stronger electric energy controllability.
DC/AC converter output terminals connect LC filter inductance electric capacity, reach the purpose for filtering out voltage and electric current higher hamonic wave.
The exchange lateral load of DC/AC converters is connected with bus, and collection AC filters port voltage and current information and is sent to void
Intend synchronization control module.Voltage includes but is not limited to the modes such as constant impedance wire rod, data signal transmission with electric current transfer mode.
Modulation wave signal is calculated by algorithm in virtual synchronous control module, and carries out SPWM modulation, so as in driving transducer
IGBT switching devices.
The quick current-limiting control of the embodiment of the present invention, as shown in figure 3, quick current-limiting control module 3 detects points of common connection
Voltage-phase θ add phase shifting angleWith IsetThree-phase current reference value i is produced as reference current amplitudeabcref, it is defeated with current transformer
Go out three-phase current iabcIt is poor to make, and producing drive signal by Hysteresis control module 4 controls opening and turning off for IGBT switching devices,
So as to realize the limitation to current transformer fault current.Voltage-phase θ is by gathering virtual machine output end voltage eabcBy PLL
What phase-locked loop module 8 obtained.
The virtual impedance current limit control module of the embodiment of the present invention, as shown in figure 4, virtual impedance current limit control module 2 with
The modulation voltage V that virtual synchronous control module 1 exportsref abcAs input, SPWM is carried out after carrying out virtual impedance current limliting processing
Modulation, so as to drive IGBT switching devices.Virtual synchronous control module 1 is with reference to active-power P*, reactive power Q*, with reference to electricity
Press E*, reference angular velocities ω*, virtual machine output voltage amplitude EmAnd output current iabcAs input, modulation voltage is produced
Vref abc；Virtual impedance current limit control module 2 is by modulation voltage Vref abcWith current transformer output three-phase current iabcIn virtual impedance
ZvPressure drop is made poor caused by upper, after eliminating high-frequency harmonic by low pass filter LPF 5, carries out SPWM modulation, drives IGBT
Switching device being opened and turning off, so as to realize that the failure current limit of current transformer controls.
Differentiation of embodiment of the present invention failure current limit controls, as shown in figure 5, fault detect and judge module 6 are with current transformer
The both ends of filter capacitor voltage and filter inductance current signal of output are input, and current signal instantaneous value and the electric current of setting are protected
Shield value is compared, and when current signal instantaneous value is less than or equal to current protection value, during micro-capacitance sensor normal operation, algorithm changeover is opened
Close down and stay at 1', connection virtual synchronous control module 1, current transformer is controlled using virtual synchronous, strengthening system virtual inertia and
Damping.In case of a fault, based on quick current-limiting control and virtual impedance Current limited Control, by detecting current transformer port electricity
Pressure drop depth judges the fault traversing control mode used required for current transformer；When current signal instantaneous value is more than current protection
During value, output control switching signal, current transformer switches into differentiation fault traversing control module, meanwhile, fault detect and sentence
Disconnected module 6 judges current transformer failure drop depth according to the size of current transformer port voltage signal, when current transformer Voltage Drop is deep
Degree is more than or equal to set threshold values, and current transformer port Voltage Drop is deeper, and algorithm changeover switch is switched at 3', connects fast speed limit
Flow control module 3, fault current is directly controlled using quick current-limiting control, produces three-phase current reference value
iabcref, with current transformer output three-phase current iabcIt is poor to make, and drive signal is produced by Hysteresis control module 4, so as to drive IGBT
Switching device, limitation dash current is realized, protect the safety of current transformer in the case of failure；When current transformer Voltage Drop depth is less than
Set threshold values, current transformer port Voltage Drop is shallower, and algorithm changeover switch is switched at 2', connects virtual impedance Current limited Control
Module 2, using virtual impedance Current limited Control, produce modulation voltage Vref abcAnd SPWM modulation is carried out, so as to drive IGBT to switch
Device, realize limiting short-circuit current while provide frequency support for micro-capacitance sensor.
SPWM modulation principles in the embodiment of the present invention, as shown in fig. 6, SPWM drive circuits receive virtual impedance current limliting control
The modulation voltage V that molding block 2 exportsref abcAfterwards, by modulation voltage Vref abcSignal and the sawtooth of 5kHz frequencies in SPWM drivers
Ripple is compared, when modulated voltage signal value is less than or equal to sawtooth signal value, from SPWM drivers to DC converter
Middle IGBT switching devices conveying high level opens drive signal, as modulation voltage Vref abcSignal value is more than sawtooth signal value
When, SPWM drivers IGBT switching devices into DC converter convey low level cut-off signals；The present embodiment is only with existing mould
Type sawtooth signal frequency is illustrated for 5kHz, and this frequency of practical application is not only limited in the numerical value.
In the present invention, the shallower distal end virtual machine of fault degree uses virtual impedance Current limited Control, and limiting short-circuit current is same
When for micro-capacitance sensor provide frequency stabilization；The serious near-end virtual machine of fault degree is controlled using quick current-limiting, suppresses dash current
Reasonable distribution power simultaneously, so as to ensure that the stability and security of whole micro-capacitance sensor in failure process is run.
Micro-capacitance sensor occurs three-phase symmetric voltage in 2s and fallen, fault clearance during 2.5s, real using the present invention in failure process
Apply a differentiation fault traversing system to be controlled, current transformer DG1, current transformer DG2, current transformer DG3 output current change, such as
Fig. 7a-7c；Common bus frequency wave is shaped like Fig. 7 d；Common bus voltage change such as Fig. 7 e；It can be seen that the present invention is real
Short-circuit impact electric current can be limited well by applying a differentiation fault traversing system, while common bus frequency, voltage can be tieed up
Hold in allowed band.
The foregoing is merely illustrative of the preferred embodiments of the present invention, is not intended to limit the scope of the present invention.It is all
Any modification, equivalent substitution and improvements made within the spirit and principles in the present invention etc., are all contained in protection scope of the present invention
It is interior.
Claims (6)
1. a kind of isolated island micro-capacitance sensor virtual machine differentiation fault traversing system, it is characterised in that by current transformer output voltage and electricity
Flow acquisition module, fault detect and judge module (6), virtual synchronous control module (1) and differentiation fault traversing control module
(7) form；Wherein,
The current transformer output voltage and current acquisition module, for detecting both ends of filter capacitor voltage and the filter of current transformer output
Ripple inductive current, and the voltage and current of detection is fed back into virtual synchronous control module (1), fault detect respectively and judges mould
Block (6) and differentiation fault traversing control module (7)；
The fault detect and judge module (6), for judging whether current transformer failure occurs and detect fault degree；
The virtual synchronous control module (1), output control during for realizing current transformer normal operation；
The differentiation fault traversing control module (7), for realizing that the fault traversing of isolated island micro-capacitance sensor virtual machine controls, by fast
Speed limit flow control module (3) forms with virtual impedance current limit control module (2), wherein, the quick current-limiting control module (3),
The control of current transformer fault current limiting during for realizing that fault degree is serious；The virtual impedance current limit control module (2), use
The control of current transformer fault current limiting when realizing that fault degree is shallower.
2. a kind of implementation method of isolated island micro-capacitance sensor virtual machine differentiation fault traversing system as claimed in claim 1, it is special
Sign is, specifically follows the steps below：
Step 1, both ends of filter capacitor voltage and filtering of the current transformer output voltage with current acquisition module detection current transformer output
Inductive current, and the voltage and current of detection is fed back into virtual synchronous control module (1), fault detect and judge module respectively
And differentiation fault traversing control module (7) (6)；
Step 2, fault detect judges whether current transformer failure occurs and detect fault degree with judge module (6)；When not occurring
During failure, output control when realizing current transformer normal operation using virtual synchronous control module (1)；
Step 3, when breaking down, and when fault degree is serious, current transformer limitation is realized using quick current-limiting control module (3) therefore
Hinder the control of electric current；When breaking down, and when fault degree is shallower, unsteady flow is realized using virtual impedance current limit control module (2)
The control of device fault current limiting.
3. a kind of implementation method of isolated island micro-capacitance sensor virtual machine differentiation fault traversing system according to claim 2, its
It is characterised by, the fault detect and judge module (6), the both ends of filter capacitor voltage and filtered electrical electrification exported with current transformer
Flow signal for input, current signal instantaneous value and the current protection value of setting compared, be less than when current signal instantaneous value or
During equal to current protection value, algorithm changeover switch connection virtual synchronous control module (1)；When current signal instantaneous value is more than electric current
During protection value, output control switching signal, current transformer switches into differentiation fault traversing control module, meanwhile, fault detect
Current transformer failure drop depth is judged with size of the judge module (6) according to current transformer port voltage signal, when current transformer voltage
Drop depth is more than or equal to set threshold values, algorithm changeover switch connection quick current-limiting control module (3)；When current transformer voltage falls
Fall depth and be less than set threshold values, algorithm changeover switch connection virtual impedance current limit control module (2).
4. a kind of implementation method of isolated island micro-capacitance sensor virtual machine differentiation fault traversing system according to claim 2, its
It is characterised by, the virtual synchronous control module (1), with output current of converter signal isTo input, with now three-phase voltage
Reference value is voltage, the voltage and electric current isThe power input being multiplied as virtual synchronous control module (1), join with active power
Examine value P*With rated angular velocity ω*Business TmMake comparisons, tabs connect under the active inertia in the virtual synchronous control module (1)
Inertia calculating and sagging calculating are carried out after receiving active power input, obtains reference wave angular velocity omega, while to reference wave angular speed
ω is integrated, and obtains the phase angle θ of reference wave；Tabs receive under idle inertia in the virtual synchronous control module (1)
Reactive power input after with rated reactive power Q*Compare, and carry out inertia and sagging calculating, obtain virtual excitation Mfif, virtually
Excitation MfifIt is multiplied by reference wave angular velocity omega and obtains the amplitude of output signal, the amplitude is multiplied by the sine value of the phase angle θ of reference wave
As the output of virtual synchronous control module (1), output control during current transformer normal operation is completed.
5. a kind of implementation method of isolated island micro-capacitance sensor virtual machine differentiation fault traversing system according to claim 2, its
It is characterised by, the quick current-limiting control module (3), the voltage-phase θ for detecting points of common connection adds phase shifting angleWith IsetAs
Reference current amplitude produces three-phase current reference value iabcref, with current transformer output three-phase current iabcIt is poor to make, and passes through Hysteresis control
Module (4) produces opening and turning off for drive signal control IGBT switching devices, so as to realize the limit to current transformer fault current
System.
6. a kind of implementation method of isolated island micro-capacitance sensor virtual machine differentiation fault traversing system according to claim 2, its
It is characterised by, the virtual impedance current limit control module (2), the modulation voltage V exported with virtual synchronous control module (1)refabc
To input, by modulation voltage VrefabcWith current transformer output three-phase current iabcIn virtual impedance ZvPressure drop is made poor caused by upper, warp
To cross after low pass filter LPF (5) elimination high-frequency harmonics, carry out SPWM modulation, driving IGBT switching devices being opened and turning off,
So as to realize that the failure current limit of current transformer controls.
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