CN109149598A - Sub-synchronous oscillation suppression method and system based on power grid proximal end locking phase - Google Patents
Sub-synchronous oscillation suppression method and system based on power grid proximal end locking phase Download PDFInfo
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Abstract
The invention discloses a kind of sub-synchronous oscillation suppression methods based on power grid proximal end locking phase, in original grid-connected vector controlled, change phase lock control structure, using the power grid proximal end phase angle extrapolated as the Reference Phase Angle of grid-connected vector controlled coordinate transform.The invention also discloses the sub-synchronous oscillations based on power grid proximal end locking phase to inhibit system.The present invention can weaken the subsynchronous ingredient in phaselocked loop output phase angle, weaken the sub-synchronous oscillation that phaselocked loop is generated with each link coupling of vector controlled, while without increasing extra cost.
Description
Technical field
The present invention relates to a kind of sub-synchronous oscillation suppression methods and system based on power grid proximal end locking phase, belong to new energy hair
Electrical domain.
Background technique
In recent years, China's generation of electricity by new energy maintains sustained and rapid growth, and accounting increasingly increases in power grid.China's wind-powered electricity generation mainly collects
In in northwest, northeast, North China, currently have become the second largest power supply in " three Norths " area.With the increase of wind-powered electricity generation accounting, wind-powered electricity generation
Access system intensity is opposite to die down, and the degree of coupling of the controlling units such as Wind turbines phaselocked loop and electric current loop is deepened, and easily leads to wind
The system oscillation problem that electricity participates in.In recent years, multiple wind-powered electricity generations concentrate access area the regional power grid of Wind turbines participation occur
Synchronized oscillation phenomenon leads to large area Wind turbines off-grid.The large-scale straight wind dispelling field in Xinjiang of China in July, 2015 somewhere goes out occurrence
Synchronized oscillation causes the torsional oscillation protection movement for closing on Steam Turbine, causes to cut machine accident.
In order to avoid sub-synchronous oscillation threatens power grid security, need to take the necessary measure the hair for inhibiting sub-synchronous oscillation
It is raw.The braking measure that scholar proposes at present can be divided into the suppressing method of power grid grade and the suppressing method of Wind turbines grade.Power grid grade
Braking measure FACTS device can be such as installed near wind power plant, but increased cost of equipment is high.The inhibition side of blower side
Method is usually to increase damping control channel in blower cutting-in control, and this method can play a role, however fail from root
Weaken coupling of blower group of planes when being connected to the grid between phaselocked loop and each link of vector controlled in sheet, to the adaptability of weak grid compared with
Difference.
Summary of the invention
The present invention provides a kind of sub-synchronous oscillation suppression methods and system based on power grid proximal end locking phase, solve existing
The not high problem of suppressing method power grid adaptability.
In order to solve the above-mentioned technical problem, the technical scheme adopted by the invention is that:
Based on the sub-synchronous oscillation suppression method of power grid proximal end locking phase, in original grid-connected vector controlled, change phaselocked loop
Control structure weakens phaselocked loop using the power grid proximal end phase angle extrapolated as the Reference Phase Angle of grid-connected vector controlled coordinate transform
The subsynchronous ingredient in phase angle is exported, the sub-synchronous oscillation of phaselocked loop and each link coupling generation of grid-connected vector controlled is weakened.
Power grid proximal end phase angle calculates process,
Grid-connected vector controlled is oriented using network voltage d axis, and the input of phaselocked loop is the q axis component of power grid proximal end voltage
Usq, UsqIt is successively adjusted by filtering, PI and integral obtains power grid proximal end phase angle.
UsqCalculation formula be,
Usq=Ugq-ω(Lt+NLtw+NLs)Igd1
Wherein, UgqFor the q axis component of blower grid entry point voltage, ω is sub-synchronous oscillation angular frequency, and N is blower number of units, Igd1
For the d axis component of separate unit blower networking electric current, LtBecome leakage inductance, L for air boxtwIt boosts for wind field and becomes leakage inductance, LsIt is equivalent for power grid
Inductance.
UgqCalculating process be,
To blower grid entry point voltage UgCLARK is carried out to convert to obtain Ugαβ, with the electricity of a control period output on phaselocked loop
Proximal end phase angle is netted to UgαβPARK transformation is carried out, U is obtainedgq；UgαβFor the transformed blower grid entry point voltage of CLARK.
Igd1Calculating process be,
To separate unit blower networking electric current Ig1CLARK is carried out to convert to obtain Igαβ1, with a control period output on phaselocked loop
Power grid proximal end phase angle to Igαβ1PARK transformation is carried out, the d axis original component I of separate unit blower networking electric current is obtainedgd1', Igd1' warp
It crosses blocking filter and filters out Ig1Fundamental wave component obtains I in the mapping of d axisgd1；Igαβ1It networks for the transformed separate unit blower of CLARK
Electric current.
By to blower networking electric current Ig1It carries out FFT operation and obtains ω；It is calculated according to the capacity of short circuit of blower grid entry point
Ls；L is calculated according to air box variable elementt；L is calculated according to wind field boosting variable elementtw。
Wind turbines sub-synchronous oscillation based on power grid proximal end locking phase inhibits system, including power grid proximal end locking phase module,
Power grid proximal end locking phase module: in original grid-connected vector controlled, change phase lock control structure, the electricity that will be extrapolated
Net Reference Phase Angle of the proximal end phase angle as grid-connected vector controlled coordinate transform, weaken in phaselocked loop output phase angle it is subsynchronous at
Point, weaken the sub-synchronous oscillation of phaselocked loop and each link coupling generation of grid-connected vector controlled.
Power grid proximal end locking phase module includes power grid proximal end phase angle prediction model；
Power grid proximal end phase angle calculates: grid-connected vector controlled is oriented using network voltage d axis, and the input of phaselocked loop is that power grid is close
Hold the q axis component U of voltagesq, UsqIt is successively adjusted by filtering, PI and integral obtains power grid proximal end phase angle.
Power grid proximal end locking phase module further includes power grid proximal end voltage q axis component computing module；
Power grid proximal end voltage q axis component computing module calculates the q axis component of power grid proximal end voltage according to the following formula,
Usq=Ugq-ω(Lt+NLtw+NLs)Igd1
Wherein, UgqFor the q axis component of blower grid entry point voltage, ω is sub-synchronous oscillation angular frequency, and N is blower number of units, Igd1
For the d axis component of separate unit blower networking electric current, LtBecome leakage inductance, L for air boxtwIt boosts for wind field and becomes leakage inductance, LsIt is equivalent for power grid
Inductance.
The q axis component computing module of power grid proximal end voltage includes blower grid entry point voltage q axis component computing module and separate unit
Blower networking electric current d axis component computing module；
Blower grid entry point voltage q axis component computing module: to blower grid entry point voltage UgCLARK is carried out to convert to obtain Ugαβ,
With the power grid proximal end phase angle of a control period output on phaselocked loop to UgαβPARK transformation is carried out, U is obtainedgq；UgαβFor CLARK change
Blower grid entry point voltage after changing；
Separate unit blower networking electric current d axis component computing module: to separate unit blower networking electric current Ig1CLARK is carried out to convert to obtain
Igαβ1, with the power grid proximal end phase angle of a control period output on phaselocked loop to Igαβ1PARK transformation is carried out, separate unit blower is obtained and enters
The d axis original component I of net electric currentgd1', Igd1' filter out I by blocking filterg1Fundamental wave component obtains I in the mapping of d axisgd1；
Igαβ1For the transformed separate unit blower networking electric current of CLARK.
Advantageous effects of the invention: the 1, present invention is by changing phase lock control structure, the power grid that will be extrapolated
Reference Phase Angle of the proximal end phase angle as wind-electricity integration vector controlled coordinate transform can weaken subsynchronous in phaselocked loop output phase angle
Ingredient weakens the sub-synchronous oscillation that phaselocked loop is generated with each link coupling of vector controlled, while without increasing extra cost；2, originally
Invention substantially weakens the subsynchronous ingredient even being eliminated in phaselocked loop output phase angle, weakens phaselocked loop and each link of vector controlled
The sub-synchronous oscillation generated is coupled, inhibitory effect is preferable；3, Project Realization of the present invention is simple, is widely used in the access of wind-powered electricity generation scale
The application scenarios of AC network.
Detailed description of the invention
Fig. 1 is the Equivalent Model figure of blower fan group access AC network；
Fig. 2 is conventional phase locked loops schematic diagram；
Fig. 3 is the improved principle of phase lock loop figure of the present invention；
Fig. 4 is inhibitory effect simulation waveform of the present invention to sub-synchronous oscillation.
Specific embodiment
The invention will be further described below in conjunction with the accompanying drawings.Following embodiment is only used for clearly illustrating the present invention
Technical solution, and not intended to limit the protection scope of the present invention.
The Equivalent Model that blower fan group accesses AC network is as shown in Fig. 1, and the voltage sample point of blower fan group is that case is lower pressure
Side, what conventional phase locked loops obtained is case low pressure side voltage phase angle, and schematic diagram is as shown in Fig. 2.With grid-connected unit number
Increase, after system equivalent, for single unit, power grid equivalent inductance is increasing, in this way since, phaselocked loop is easy to
It is coupled with each link generation of vector controlled, to help the generation and amplification of sub-synchronous oscillation, for this reason, it may be necessary to conventional phase locked loops
Structure improves, specific as following:
Sub-synchronous oscillation suppression method based on power grid proximal end locking phase: in original grid-connected vector controlled, change phaselocked loop
Control structure substantially weakens lock using the power grid proximal end phase angle extrapolated as the Reference Phase Angle of grid-connected vector controlled coordinate transform
Phase ring exports the subsynchronous ingredient in phase angle, weakens the subsynchronous vibration of phaselocked loop and each link coupling generation of grid-connected vector controlled
It swings.
The positive direction for defining electric current is to flow into power grid, and for Equivalent Model figure shown in FIG. 1, blower grid entry point is close with power grid
The vector correlation formula of end voltage can indicate are as follows:
Wherein, UgFor blower grid entry point voltage vector, ω is sub-synchronous oscillation angular frequency, LtBecome leakage inductance, L for air boxtw
It boosts for wind field and becomes leakage inductance, LsFor power grid equivalent inductance, N is wind field blower number of units, IgFor wind field networking current phasor, UsFor electricity
Net proximal end voltage vector.
For separate unit blower fan group, blower grid entry point and the vector correlation of power grid proximal end voltage can be indicated are as follows:
Ug-ω(Lt+NLtw+NLs)Ig1=Us (2)
Wherein, Ig1For separate unit blower networking current phasor.
By above-mentioned formula 2 it is found that according to blower grid entry point voltage, networking electric current, blower number of units, sub-synchronous oscillation angular frequency
Rate, air box, which become leakage inductance, wind field boosting change leakage inductance and power grid equivalent inductance, counter can release power grid proximal end voltage.
Formula 2 can indicate on the dq axis in synchronous rotating frame are as follows:
Wherein, UgqFor the q axis component of blower grid entry point voltage, UgdFor the d axis component of blower grid entry point voltage, UsqFor electricity
Net the q axis component of proximal end voltage, UsdFor the d axis component of power grid proximal end voltage, Igd1For the d axis component of separate unit blower networking electric current,
Igq1For the q axis component of separate unit blower networking electric current.
According to formula 3 it is found that according to the q axis component U of blower grid entry point voltagegqWith the d axis point of separate unit blower networking electric current
Measure Igd1It counter can release the q axis component U of power grid proximal end voltagesq。
Based on above-mentioned analysis, the concrete principle of the sub-synchronous oscillation suppression method is as follows:
Wind-electricity integration vector controlled is oriented using network voltage d axis, and for the phase angle for obtaining power grid proximal end voltage, phaselocked loop is needed
By the q axis component U of power grid proximal end voltagesqLock is zero；Concrete principle figure is as shown in figure 3, to blower grid entry point voltage UgIt carries out
CLARK converts to obtain Ugαβ, with the power grid proximal end phase angle of a control period output on phaselocked loop to UgαβPARK transformation is carried out, is obtained
To the q axis component U of blower grid entry point voltagegq；To separate unit blower networking electric current Ig1CLARK is carried out to convert to obtain Igαβ1, use locking phase
The power grid proximal end phase angle of a control period output is to I on ringgαβ1PARK transformation is carried out, the d of separate unit blower networking electric current is obtained
Axis original component Igd1', Igd1' filter out I by blocking filterg1Fundamental wave component obtains separate unit blower networking electricity in the mapping of d axis
The d axis component I of streamgd1, it is calculated through following equation 4,
Usq=Ugq-ω(Lt+NLtw+NLs)Igd1 (4)
Obtain the q axis component U of power grid proximal end voltagesq, i.e. the input of phaselocked loop, UsqSuccessively by filtering, PI adjusting and product
Get phaselocked loop output, as power grid proximal end phase angle.
In formula 4, by blower networking electric current Ig1It carries out FFT operation and obtains ω；Held according to the short circuit of blower grid entry point
Meter calculates Ls, the deviation that allows to have -40%~40% for blower grid entry point capacity of short circuit；It is calculated according to air box variable element
Obtain Lt；L is calculated according to wind field boosting variable elementtw.When blower scale access AC network occurs what wind-powered electricity generation control participated in
When sub-synchronous oscillation, secondly the amplitude of synchronizing band component is minimum in blower access point maximum, system power supply point, and formula 4 contains
Justice is UgqSubtract pressure drop of the d axis ingredient of networking electric current subsynchronous component between blower and system power supply in equivalent inductance
Obtain Usq, the subsynchronous ingredient of phaselocked loop input is greatly reduced, thereby reduces the subsynchronous content of phaselocked loop output phase angle.It examines
Considering blower grid entry point capacity of short circuit value, generally there are deviations, are only considered that UsqClose to system power supply point, subsynchronous frequency band " electricity is realized
Net proximal end " locking phase, abbreviation power grid proximal end locking phase.
The electrical quantity of above method sampling extrapolates power grid proximal end phase angle and replaces former phase-locked loop output phase angle, in Duo Tai
Blower accesses excellent to the inhibitory effect of sub-synchronous oscillation in the Equivalent Model of AC network.Emulation testing waveform such as 4 institute of attached drawing
Show, in the case where short-circuit ratio is 1.8 operating condition, locks blower grid entry point voltage phase angle using conventional phase locked loops before 2.75s, adopted after 2.75s
Power grid proximal end voltage phase angle is locked with phaselocked loop is improved, is shown using improvement phaselocked loop scheme proposed by the present invention to sub-synchronous oscillation
There is good inhibiting effect.
The above method substantially weakens the subsynchronous ingredient even being eliminated in phaselocked loop output phase angle, weakens phaselocked loop and arrow
Amount controls the sub-synchronous oscillation that each link coupling generates, and realizes the inhibition to sub-synchronous oscillation, inhibitory effect is preferable, is not necessarily to simultaneously
Increase extra cost, and Project Realization is simple, is widely used in the application scenarios of wind-powered electricity generation scale access AC network.
Sub-synchronous oscillation based on power grid proximal end locking phase inhibits system, including power grid proximal end locking phase module, power grid proximal end lock
Phase module: in original grid-connected vector controlled, change phase lock control structure, using the power grid proximal end phase angle extrapolated as grid-connected
The Reference Phase Angle of vector controlled coordinate transform weakens the subsynchronous ingredient in phaselocked loop output phase angle, weakens phaselocked loop and grid-connected
The sub-synchronous oscillation that each link coupling of vector controlled generates.
Power grid proximal end locking phase module includes power grid proximal end phase angle prediction model；Power grid proximal end phase angle calculates: grid-connected vector control
System is oriented using network voltage d axis, and the input of phaselocked loop is the q axis component U of power grid proximal end voltagesq, UsqSuccessively by filtering,
PI is adjusted and integral obtains power grid proximal end phase angle.
Power grid proximal end locking phase module further includes power grid proximal end voltage q axis component computing module；Power grid proximal end voltage q axis component
Computing module calculates the q axis component of power grid proximal end voltage according to the following formula,
Usq=Ugq-ω(Lt+NLtw+NLs)Igd1
Wherein, UgqFor the q axis component of blower grid entry point voltage, ω is sub-synchronous oscillation angular frequency, and N is blower number of units, Igd1
For the d axis component of separate unit blower networking electric current, LtBecome leakage inductance, L for air boxtwIt boosts for wind field and becomes leakage inductance, LsIt is equivalent for power grid
Inductance.
The q axis component computing module of power grid proximal end voltage includes blower grid entry point voltage q axis component computing module and separate unit
Blower networking electric current d axis component computing module.
Blower grid entry point voltage q axis component computing module: to blower grid entry point voltage UgCLARK is carried out to convert to obtain Ugαβ,
With the power grid proximal end phase angle of a control period output on phaselocked loop to UgαβPARK transformation is carried out, U is obtainedgq；UgαβFor CLARK change
Blower grid entry point voltage after changing；
Separate unit blower networking electric current d axis component computing module: to separate unit blower networking electric current Ig1CLARK is carried out to convert to obtain
Igαβ1, with the power grid proximal end phase angle of a control period output on phaselocked loop to Igαβ1PARK transformation is carried out, separate unit blower is obtained and enters
The d axis original component I of net electric currentgd1', Igd1' filter out I by blocking filterg1Fundamental wave component obtains I in the mapping of d axisgd1；
Igαβ1For the transformed separate unit blower networking electric current of CLARK.
A kind of computer readable storage medium storing one or more programs, one or more of programs include referring to
Enable, described instruction when executed by a computing apparatus so that the calculatings equipment execution the subsynchronous vibration based on power grid proximal end locking phase
Swing suppressing method.
A kind of calculating equipment, including one or more processors, memory and one or more program, one of them or
Multiple programs store in the memory and are configured as being executed by one or more of processors, one or more of
Program includes the instruction for executing the sub-synchronous oscillation suppression method based on power grid proximal end locking phase.
Sub-synchronous oscillation suppression method based on power grid proximal end locking phase is applicable not only to wind-electricity integration, is also applied for photovoltaic simultaneously
Net, energy storage are grid-connected etc., therefore the calculating equipment is current transformer or static state reactive generator.
It should be understood by those skilled in the art that, embodiments herein can provide as method, system or computer program
Product.Therefore, complete hardware embodiment, complete software embodiment or reality combining software and hardware aspects can be used in the application
Apply the form of example.Moreover, it wherein includes the computer of computer usable program code that the application, which can be used in one or more,
The computer program implemented in usable storage medium (including but not limited to magnetic disk storage, CD-ROM, optical memory etc.) produces
The form of product.
The application is referring to method, the process of equipment (system) and computer program product according to the embodiment of the present application
Figure and/or block diagram describe.It should be understood that every one stream in flowchart and/or the block diagram can be realized by computer program instructions
The combination of process and/or box in journey and/or box and flowchart and/or the block diagram.It can provide these computer programs
Instruct the processor of general purpose computer, special purpose computer, Embedded Processor or other programmable data processing devices to produce
A raw machine, so that being generated by the instruction that computer or the processor of other programmable data processing devices execute for real
The device for the function of being specified in present one or more flows of the flowchart and/or one or more blocks of the block diagram.
These computer program instructions, which may also be stored in, is able to guide computer or other programmable data processing devices with spy
Determine in the computer-readable memory that mode works, so that it includes referring to that instruction stored in the computer readable memory, which generates,
Enable the manufacture of device, the command device realize in one box of one or more flows of the flowchart and/or block diagram or
The function of being specified in multiple boxes.
These computer program instructions also can be loaded onto a computer or other programmable data processing device, so that counting
Series of operation steps are executed on calculation machine or other programmable devices to generate computer implemented processing, thus in computer or
The instruction executed on other programmable devices is provided for realizing in one or more flows of the flowchart and/or block diagram one
The step of function of being specified in a box or multiple boxes.
The above is only the embodiment of the present invention, are not intended to restrict the invention, all in the spirit and principles in the present invention
Within, any modification, equivalent substitution, improvement and etc. done, be all contained in apply pending scope of the presently claimed invention it
It is interior.
Claims (10)
1. the sub-synchronous oscillation suppression method based on power grid proximal end locking phase, it is characterised in that: in original grid-connected vector controlled, change
Become phase lock control structure to subtract using the power grid proximal end phase angle extrapolated as the Reference Phase Angle of grid-connected vector controlled coordinate transform
Subsynchronous ingredient in weak phaselocked loop output phase angle, weakens phaselocked loop and each link of grid-connected vector controlled couples the subsynchronous of generation
Oscillation.
2. the sub-synchronous oscillation suppression method according to claim 1 based on power grid proximal end locking phase, it is characterised in that: power grid
Proximal end phase angle calculates process,
Grid-connected vector controlled is oriented using network voltage d axis, and the input of phaselocked loop is the q axis component U of power grid proximal end voltagesq, Usq
It is successively adjusted by filtering, PI and integral obtains power grid proximal end phase angle.
3. the sub-synchronous oscillation suppression method according to claim 2 based on power grid proximal end locking phase, it is characterised in that: Usq's
Calculation formula is,
Usq=Ugq-ω(Lt+NLtw+NLs)Igd1
Wherein, UgqFor the q axis component of blower grid entry point voltage, ω is sub-synchronous oscillation angular frequency, and N is blower number of units, Igd1For list
The d axis component of Fans networking electric current, LtBecome leakage inductance, L for air boxtwIt boosts for wind field and becomes leakage inductance, LsFor power grid equivalent inductance.
4. the sub-synchronous oscillation suppression method according to claim 3 based on power grid proximal end locking phase, it is characterised in that: Ugq's
Calculating process is,
To blower grid entry point voltage UgCLARK is carried out to convert to obtain Ugαβ, close with the power grid that a control period exports on phaselocked loop
Hold phase angle to UgαβPARK transformation is carried out, U is obtainedgq；UgαβFor the transformed blower grid entry point voltage of CLARK.
5. the sub-synchronous oscillation suppression method according to claim 3 based on power grid proximal end locking phase, it is characterised in that: Igd1
Calculating process be,
To separate unit blower networking electric current Ig1CLARK is carried out to convert to obtain Igαβ1, with the electricity of a control period output on phaselocked loop
Proximal end phase angle is netted to Igαβ1PARK transformation is carried out, the d axis original component I of separate unit blower networking electric current is obtainedgd1', Igd1' by every
Straight filter filters out Ig1Fundamental wave component obtains I in the mapping of d axisgd1；Igαβ1It networks for the transformed separate unit blower of CLARK electric
Stream.
6. the sub-synchronous oscillation suppression method according to claim 3 based on power grid proximal end locking phase, it is characterised in that: pass through
To blower networking electric current Ig1It carries out FFT operation and obtains ω；L is calculated according to the capacity of short circuit of blower grid entry points；According to air box
L is calculated in variable elementt；L is calculated according to wind field boosting variable elementtw。
7. sub-synchronous oscillation based on power grid proximal end locking phase inhibits system, it is characterised in that: including power grid proximal end locking phase module,
Power grid proximal end locking phase module: in original grid-connected vector controlled, changing phase lock control structure, and the power grid extrapolated is close
Reference Phase Angle of the phase angle as grid-connected vector controlled coordinate transform is held, weakens the subsynchronous ingredient in phaselocked loop output phase angle, cuts
The sub-synchronous oscillation that weak phaselocked loop and each link coupling of grid-connected vector controlled generate.
8. the sub-synchronous oscillation according to claim 7 based on power grid proximal end locking phase inhibits system, it is characterised in that: power grid
Proximal end locking phase module includes power grid proximal end phase angle prediction model；
Power grid proximal end phase angle calculates: grid-connected vector controlled is oriented using network voltage d axis, and the input of phaselocked loop is power grid proximal end electricity
The q axis component U of pressuresq, UsqIt is successively adjusted by filtering, PI and integral obtains power grid proximal end phase angle.
9. the sub-synchronous oscillation according to claim 8 based on power grid proximal end locking phase inhibits system, it is characterised in that: power grid
Proximal end locking phase module further includes power grid proximal end voltage q axis component computing module；
Power grid proximal end voltage q axis component computing module calculates the q axis component of power grid proximal end voltage according to the following formula,
Usq=Ugq-ω(Lt+NLtw+NLs)Igd1
Wherein, UgqFor the q axis component of blower grid entry point voltage, ω is sub-synchronous oscillation angular frequency, and N is blower number of units, Igd1For list
The d axis component of Fans networking electric current, LtBecome leakage inductance, L for air boxtwIt boosts for wind field and becomes leakage inductance, LsFor power grid equivalent inductance.
10. the sub-synchronous oscillation according to claim 9 based on power grid proximal end locking phase inhibits system, it is characterised in that: electricity
The q axis component computing module of net proximal end voltage includes blower grid entry point voltage q axis component computing module and separate unit blower networking electricity
Flow d axis component computing module；
Blower grid entry point voltage q axis component computing module: to blower grid entry point voltage UgCLARK is carried out to convert to obtain Ugαβ, with lock
The power grid proximal end phase angle of a control period output is to U on phase ringgαβPARK transformation is carried out, U is obtainedgq；UgαβAfter CLARK transformation
Blower grid entry point voltage；
Separate unit blower networking electric current d axis component computing module: to separate unit blower networking electric current Ig1CLARK is carried out to convert to obtain
Igαβ1, with the power grid proximal end phase angle of a control period output on phaselocked loop to Igαβ1PARK transformation is carried out, separate unit blower is obtained and enters
The d axis original component I of net electric currentgd1', Igd1' filter out I by blocking filterg1Fundamental wave component obtains I in the mapping of d axisgd1；
Igαβ1For the transformed separate unit blower networking electric current of CLARK.
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