CN109861240A - A kind of control method of the Distributed Power Flow controller based on ADPSS/ETSDAC modeling - Google Patents
A kind of control method of the Distributed Power Flow controller based on ADPSS/ETSDAC modeling Download PDFInfo
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Abstract
The present invention relates to a kind of control methods of Distributed Power Flow controller based on ADPSS/ETSDAC modeling, specifically: by DPFC parallel connection side current transformer VSC-SH1 and VSC-SH2 with controlled current source come equivalent, by DPFC series side current transformer with controlled voltage source come equivalent, for the control for realizing series side current transformer DC capacitor voltage；To improve reliability of the DPFC under system fault conditions, a kind of series side fundamental voltage control method for taking power vs. voltage double -loop control and the corresponding modeling method based on ADPSS/ETSDAC are proposed.Using control proposed by the present invention and modeling method, due to not being related to the type selecting of filter inductance, capacitor, need to only modify to controller parameter can be suitable for different electric power, have preferably operability and wide applicability than detailed model.
Description
Technical field
The present invention relates to the technical fields of Distributed Power Flow controller simulation modeling.ADPSS/ is based on more particularly to one kind
The control method of the Distributed Power Flow controller of ETSDAC modeling.
Background technique
Distributed Power Flow controller (Distributed Power Flow Controller, DPFC) and Unified Power Flow control
Controller (Unified Power Flow Controller, UPFC) processed is series-parallel mixed type flexible AC transmission equipment.
Compared with UPFC, DPFC is mainly improved the current transformer of part in series, substitutes original with the current transformer of several low capacities
The centralized current transformer having, cost is more economical, redundancy is higher, reliability is stronger.But the research of DPFC is still located at present
In the l-G simulation test stage, although the existing detailed switch models on MATLAB/SIMULINK, PSCAD/EMTDC emulation platform,
And it is able to verify that the correctness of DPFC principle and its power flowcontrol ability, but there are following limitations for its application range: when will be detailed
When switch models are applied to different electric power, due to current transformer capacity and regulating effect be limited to current transformer filter inductance with
DC capacitor, therefore, whenever the type selecting again for being necessarily accompanied with current transformer component when new system is tested；Meanwhile because in detail
Thin switch models generally need to can just obtain better effects in 2 microseconds simulation step length below, and simulation efficiency is low, be unfavorable for research just
Phase debugs the determination of installed capacity parameter and controller parameter.Therefore the present invention utilizes the equivalent DPFC current transformer of controlled source
Thought proposes a set of corresponding control method, to break through the bottleneck of existing model.
ADPSS/ETSDAC is the electromagnetic transient simulation platform of China Electric Power Research Institute's exploitation, which can combine
ADPSS/PSASP Based on Power System Analysis Software Package does electromechanics-electromagnetic transient hybrid simulation, have than MATLAB/SIMULINK,
PSCAD/EMTDC more powerful electromechanics-electromagnetism interaction capabilities, is more suitable the hybrid simulation of power electronic equipment and bulk power grid.
And have no the relevant report of equivalent model of the DPFC under ADPSS/ETSDAC platform at present, therefore, the present invention propose with
ADPSS/ETSDAC realizes the modeling based on the equivalent DPFC of controlled source and its control method, and to make electromechanics-electromagnetism mixed to be subsequent
It closes emulation to lay foundation, provides theoretical reference for DPFC prototype design.
Summary of the invention
Above-mentioned technical problem of the invention is mainly to be addressed by following technical proposals:
A kind of control method of the Distributed Power Flow controller based on ADPSS/ETSDAC modeling, which is characterized in that including
Step 1 builds one machine infinity bus system under ADPSS/ETSDAC emulation platform, wherein equipped with distribution on route
Formula flow controller series side current transformer model, VSC-SEx (x=a, b, c) are respectively that series side a, b, c 3-phase power converter is equivalent
Model；Side current transformer in parallel is divided into VSC-SH1 and VSC-SH2 two parts, and VSC-SH1 connects with bus, VSC-SH2 and transformer
T1 neutral point connects；
Sending end generator G1 voltage is Vs, and receiving end generator G2 voltage is Vr；1 impedance of route is XL1, and route 2 hinders
Resist for XL2, the Y- △ transformer at first and last end is respectively T1 and T2, and series transformer is respectively T3, T4, T5；
Step 2, the electro-magnetic transient equivalent model that DPFC parallel connection side is built on ADPSS/ETSDAC emulation platform；
Step 2.1, DPFC parallel connection side current transformer are divided into two, and one is the current transformer VSC-SH1 to connect with bus, another
A is the VSC-SH2 to connect with transformer T1 neutral point；The control target of VSC-SH1 be system voltage V1 and VSC-SH1 with
Active power balance relationship between VSC-SH2, and VSC-SH2 main function is to generate 3 subharmonic currents；
Step 2.2, given system voltage V1.ref compared with system virtual voltage V1 deviation signal, controlled by PI
The reactive current component Ishq* injected needed for VSC-SH1 to system is obtained after device；Current transformer DC capacitor voltage in side in parallel
Control can pass through real-time measurement with the active power balance relationship between parallel converters VSC-SH1 and VSC-SH2 come equivalent
The active-power P sh3 that VSC-SH2 is issued, is compared to obtain deviation signal with Psh1 using Psh3, deviation signal is controlled through PI
The active current Ishd* injected to system is obtained after device processed；Then, the phase of busbar voltage V1 is obtained using phase-locked loop pll
Angle wt, by Ishd* and Ishq* by three-phase park inverse transformation, as shown in figure 8, obtaining the three-phase electricity that VSC-SH1 is injected to system
Stream instruction Isha, Ishb, Ishc；Required current-order is input in three-phase controlled current source, can produce it corresponding
Electric current；
Step 2.3, parallel connection side current transformer VSC-SH2 are that 3 subharmonic currents generate link, by single-phase controlled current source
It inputs the expectation amplitude (per unit value) of I3 and it is made to carry out multiplying with 150Hz unit sine wave, 3 subharmonic are obtained after operation
Current-order is input in controlled current source and single-phase inverters can be realized to system 3 subharmonic currents of injection；Specifically such as
Shown in Fig. 3；
Step 3, the electro-magnetic transient equivalent model that DPFC series side is built in ADPSS/ETSDAC emulation platform；
On the one hand the effect of step 3.1, series converter is that it is maintained using 3 subharmonic currents of side in parallel sending certainly
Equilibrium relation between body fundamental active Pse1 and the active Pse3 of 3 subharmonic generates corresponding 3 subharmonic voltage to absorb 3 times
Harmonic wave wave power；On the other hand it is the response to system load flow demand, generates corresponding fundamental frequency voltages to control Line Flow；By
In the superimposed voltage that the output of series converter is fundamental voltage and 3 subharmonic voltages, therefore its control can be divided into fundamental wave electricity
The control and the control of 3 subharmonic voltages of pressure；
Step 3.2, fundamental voltage output depend on system load flow demand, for limit fundamental voltage the output upper limit,
The present invention uses double -loop control, and outer ring is power ring, and inner ring is Voltage loop, as shown in Figure 6,7 respectively；By given active power
PL.ref, given reactive power Q L.ref are compared to obtain deviation signal with system active-power P L, reactive power Q L respectively
Perr, Qerr, Perr and Qerr obtained after PI controller respectively the voltage control signal V21q.ref of inner ring with
V21d.ref, V21q.ref and V21d.ref are clipping output, and purpose is to guarantee inner ring Setting signal in a certain range, with this
Limit the series side fundamental voltage upper limit；The series connection electromotive force V21 that measurement series side current transformer generates on the line, utilizes DFT mould
Block extracts the amplitude and initial phase angle of V21 Yu head end voltage V1 ' respectively, is calculated by single-phase park conversion module, obtains fundamental wave string
Join d, q the axis component V21d and V21q of electromotive force, as shown in Figure 9；Respectively by V21d.ref, V21q.ref and V21d, V21q into
Row relatively obtains deviation signal V21d.err, V21q.err, and the output of series side current transformer is finally obtained after PI controller
D, q the component Vsed.1 and Vseq.1 of fundamental voltage carry out Vsed and Vseq single using the phase angle of PLL output as Reference Phase Angle
Phase park inverse transformation finally obtains the fundamental voltage Vse1x of series side current transformer output；
Step 3.3, the size of 3 subharmonic voltage Vse3 depend on the demand of series converter active-power P se1, in real time
The fundamental active power Pse1 for measuring series side current transformer and systems exchange, is asked by V12d.3ref=Pse1/0.5/ (I3/3)
The value of V12d.3 is obtained, in order to avoid series side current transformer and 3 subharmonic reactive power of systems exchange, therefore V12q.3ref is set as
0；The series connection electromotive force V12 that measurement series side current transformer generates on the line, V12 and 3 subharmonic are extracted using DFT block respectively
The amplitude and initial phase angle of electric current I3 is calculated by single-phase park conversion module, obtains d, q axis point of 3 subharmonic series connection electromotive force
V12d.3 and V12q.3 is measured, respectively by V12d.3ref, V12q.3ref is compared to obtain deviation signal with V12d.3, V12q.3
V12d.err, V12q.err finally obtain d, q component of 3 subharmonic voltages of series side current transformer output after PI controller
Vsed.3 and Vseq.3 obtains the phase angle wt3 of 3 subharmonic currents using PLL, and Vsed.3 and Vseq.3 is inverse by single-phase park
Conversion module obtains 3 subharmonic voltage Vse3x of single-phase converter output, is finally input to Vse1+Vse3 corresponding controlled
Voltage source makes it generate superimposed expectation voltage Vse, realizes the regulation to system load flow；
Step 4, emulation when, need to DPFC access busbar voltage given value V1.ref, charged line active power give
Definite value PL.ref, reactive power given value QL.ref, the instruction of 3 subharmonic currents, PI controller parameter, clipping functional parameter and
Device switching time parameter etc. is configured；It is emulated after setting completed, " curve output " column can be clicked after emulation
ADPSS curve reading room is opened, response curve and given Line Flow (PLref, QLref) and busbar voltage (V1ref) are compared
Compared with if curve is consistent with given value, it is feasible for verifying the electro-magnetic transient equivalent mathematical model of proposed DPFC.
The invention proposes a kind of control method of Distributed Power Flow controller and based on the modeling of ADPSS/ETSDAC, tool
Body are as follows:
By DPFC parallel connection side current transformer VSC-SH1 and VSC-SH2 with controlled current source come equivalent, propose a kind of using monocycle
The control method and the corresponding modeling method based on ADPSS/ETSDAC of the current transformer VSC-SH1 in side in parallel of control mode.
By DPFC series side current transformer with controlled voltage source come equivalent, to realize series side current transformer DC capacitor voltage
Control proposes a kind of novel 3 subharmonic voltage control method of series side and the corresponding modeling side based on ADPSS/ETSDAC
Method.
To improve reliability of the DPFC under system fault conditions, a kind of string for taking power vs. voltage double -loop control is proposed
Join side group wave voltage control method and the corresponding modeling method based on ADPSS/ETSDAC.
It is only needed using control proposed by the present invention and modeling method due to not being related to the type selecting of filter inductance, capacitor
Different electric power can be suitable for by modifying to controller parameter, be had than detailed model preferably operational and extensive
Applicability；And for ADPSS/ETSDAC, make electromechanics-since it can combine ADPSS/PSASP Based on Power System Analysis Software Package
Electromagnetic transient hybrid simulation is more suitable power electronic equipment and big compared with PSCAD/EMTDC, MATLAB/SIMULINK
The emulation of power grid.Therefore the control method of Distributed Power Flow controller proposed by the present invention and the modeling side based on ADPSS/ETSDAC
Method is suitable for the test under not homologous ray to DPFC performance, can provide in the power system fast and accurately for future DPFC application
Technical support.
Therefore, the present invention has the advantage that can be omitted using the controlled source method of equal effect to detailed switch models component
Type selecting link, controlled source itself can regard an infinitely great power supply as only to be needed due to not having capacity limit, therefore under not homologous ray
Changing controller parameter just can make its normal work；Controlled source is bigger than detailed switch models in time scale, can with compared with
Big step-length operation, simulation velocity faster, greatly improve the debugging efficiency of controller.
Detailed description of the invention
Attached drawing 1 is the equivalent circuit of the device of the present invention containing DPFC；
Attached drawing 2 is VSC-SH1 control schematic diagram of the present invention；
Attached drawing 3 is VSC-SH2 control schematic diagram of the present invention；
Attached drawing 4 is 3 subharmonic voltage d axis instruction calculation module structural schematic diagram of series side of the present invention.
Attached drawing 5 is 3 subharmonic voltage control schematic diagram of series side of the present invention；
Attached drawing 6 is series side current transformer power ring schematic diagram of the present invention
Attached drawing 7 is series side current transformer Voltage loop schematic diagram of the present invention
Attached drawing 8 is side in parallel current-order park inverse transformation schematic diagram of the present invention
Attached drawing 9 is series side fundamental voltage park transformation schematic diagram of the present invention
Attached drawing 10 is series side fundamental voltage instruction park inverse transformation schematic diagram of the present invention
Attached drawing 11 is 3 subharmonic voltage park of series side variation schematic diagram of the present invention
Attached drawing 12 is 3 subharmonic voltage of series side instruction park inverse transformation schematic diagram of the present invention.
Specific embodiment
Below with reference to the embodiments and with reference to the accompanying drawing the technical solutions of the present invention will be further described.
Embodiment:
Summary of the invention for convenience of description provides the equivalent circuit diagram of the device as shown in Figure 1 containing DPFC herein.
Wherein, Distributed Power Flow controller series side current transformer model is housed, VSC-SEx (x=a, b, c) is respectively on route
For series side a, b, c 3-phase power converter equivalent model, the series connection electromotive force Vsex (x=a, b, c) generated plays adjusting circuit tide
It flows (PL, QL) and absorbs the effect of 3 subharmonic active power.Side current transformer in parallel is divided into VSC-SH1 and VSC-SH2 two parts,
VSC-SH1 connects with bus, maintain busbar voltage V1 stable by output electric current Ishx (x=a, b, c) and VSC-SH1,
The effect of active power balance between VSC-SH2；VSC-SH2 mainly plays a part of to generate 3 subharmonic current I3；Psh1 is VSC-
The fundamental active power of SH1 and systems exchange, Psh3 are the 3 subharmonic active power of VSC-SH2 and systems exchange.
Sending end generator G1 voltage is Vs, and receiving end generator G2 voltage is Vr.1 impedance of route is XL1, and route 2 hinders
Resist for XL2, the Y- △ transformer at first and last end is respectively T1 and T2, and series coupled transformer is respectively T3, T4, T5, design parameter
It is as follows:
Whole network voltage grade (reference voltage) be 220KV, reference capacity 100MVA, behind all amounts with per unit value table
Show.0 ° of ∠ of G1 voltage Vs=1, ∠ -8.7 ° of Vr=0.95 of G2 voltage；XL1=0.0052+j0.0413, XL2=0.0207+
j0.1653；Transformer T1 and T2 no-load voltage ratio are 220kV/220kV, equivalent impedance 0.0030+j0.1300, transformer T3,
T4, T5 no-load voltage ratio are 100kV/100kV, equivalent impedance 0.0002+j0.0020.
1, the modeling of DPFC parallel connection side current transformer equivalent model and control method
The present invention is using controlled current source come equivalent VSC-SH1 and VSC-SH2.After equivalent, because of VSC-SH1 and VSC-
Not identical as specific device in SH2 structure, corresponding control method is also different therewith.
So the present invention proposes the control method of novel current transformer VSC-SH1 in side in parallel a kind of, detailed switch models
Voltage-to-current double -loop control be reduced to monocycle control, inner ring current-order is obtained by outer ring, is directly inputted to controlled current flow
Source makes it generate corresponding electric current.And propose the modeling method under ADPSS/ETSDAC emulation platform, it may be assumed that by real-time
The 3 subharmonic active-power P sh3 for measuring VSC-SH2 and systems exchange, in this, as given instruction, then enable Psh3 and feedback letter
Number Psh1 is compared to obtain deviation signal, calculates through PI controller, and finally obtaining needed for VSC-SH1 having to what system was injected
Function current component Ishd*.Meanwhile using V1.ref as bus alternating voltage amplitude given value, V1 as bus alternating current pressure amplitude
Value feedback, obtains deviation signal after enabling V1.ref be compared with V1, obtains infusing needed for VSC-SH1 to system after PI controller
The reactive current component Ishq* entered.It is specific as shown in Figure 2.
VSC-SH2 is the generation module of 3 subharmonic current I3, by inputting expectation amplitude I3 to single-phase controlled current source
The function that VSC-SH2 injects 3 constant subharmonic currents to system can be realized in 3 subharmonic current of the sine instruction of (per unit value)
Energy.Its corresponding modeling method under ADPSS/ETSDAC platform is as shown in Figure 3.
2, DPFC series side current transformer equivalent model modeling method
On the one hand the effect of DPFC series converter VSC-SEx (x=a, b, c) is that VSC-SEx generates corresponding 3 subharmonic
Voltage absorbs 3 subharmonic active power of VSC-SH2 sending, is on the other hand that VSC-SEx generates corresponding fundamental frequency voltages and comes
Control Line Flow.
It follows that the output of series converter is being superimposed for 3 subharmonic voltages and fundamental voltage, therefore its control can divide
For the control of control and fundamental voltage to 3 subharmonic voltages.
Using controlled voltage source, come equivalent series current transformer, current transformer DC capacitor is not present in the present invention, therefore for 3 times
The control of harmonic voltage will make equivalent process.When ignore current transformer loss when because the stabilization of DC capacitor voltage can it is equivalent at
Equilibrium relation between current transformer and the fundamental active power Pse1 and 3 subharmonic active-power P se3 of systems exchange.
So to meet the equilibrium relation between series side current transformer fundamental active power and 3 subharmonic active power, this hair
The bright new type of control method for proposing a kind of pair of 3 subharmonic voltage of series side, and propose corresponding based on ADPSS/ETSDAC emulation
Modeling method under platform.That is: V12d.3ref=Pse1/ (0.5*I3/3) is enabled to instruct as the d shaft voltage of 3 subharmonic voltages,
Using I3 phase angle as synchronous phase angle, park transformation is carried out to the 3 subharmonic voltage V12.3 that current transformer generates on the line, is acquired 3 times
D, q axis component of harmonic voltage are respectively V12d.3, V12q.3.Deviation is obtained after V12d.3ref and V12d.3 are compared
Signal finally acquires 3 subharmonic voltage d axis instruction Vsed.3 through PI controller.To reduce series side Converter Capacity, current transformer
It does not exchange 3 subharmonic reactive powers with system, therefore V12q.3ref=0 is set, after enabling V12q.3ref be compared with V12q.3
Deviation signal is obtained, 3 subharmonic voltage q axis instruction Vseq.3 is acquired after PI controller.It is specific as shown in Figure 4,5.
Because of Pse3=0.5*V12d.3*I3/3, when the deviation of V12d.3ref and V12d.3 is zero, Pse3=
Pse1 is able to achieve the constant effect of current transformer DC capacitor voltage.
Series side fundamental voltage plays adjusting circuit trend, at present to take power-current double -loop control more, although right
Line current plays control action, but in extreme circumstances (such as short circuit), in order to limit size of current, series side fundamental wave needs to produce
Biggish fundamental voltage is given birth to maintain line current constant.However, because the fundamental voltage of series side current transformer output is less than directly
Capacitance voltage is flowed, so in order to limit route size of current, it is possible that causing sternly the case where DC voltage pumping-up to device
The damage of weight.
Therefore, the present invention proposes the fundamental voltage that the output of series side current transformer is controlled using power vs. voltage double -loop control,
Under such an approach, series side current transformer carries out clipping control to output voltage, avoids the occurrence of current transformer capacitance voltage feelings out of control
Condition guarantees the reliability of current transformer inversion work.It, can be indirectly by change although cannot directly control electric current
The fundamental voltage of output controls electric current.
The invention also provides the modelings under the corresponding emulation platform based on ADPSS/ETSDAC of power vs. voltage double -loop control
Method, it may be assumed that by given active-power P L.ref, given reactive power Q L.ref respectively with system active-power P L, reactive power
QL is compared to obtain deviation signal Perr, Qerr, and Perr and Qerr obtain the voltage control of inner ring after PI controller respectively
Signal V21q.ref and V21d.ref processed, V21q.ref and V21d.ref are clipping output, and purpose is to guarantee inner ring Setting signal
In a certain range, the series side fundamental voltage upper limit is limited with this；Respectively by V21d.ref, V21q.ref and V21d, V21q into
Row relatively obtains deviation signal V21d.err, V21q.err, and the output of series side current transformer is finally obtained after PI controller
D, q component Vsed.1 and Vseq.1 of fundamental voltage.It is specific as shown in Figure 6,7.
Four, implementation steps
By a kind of Distributed Power Flow controller electro-magnetic transient equivalent model based on ADPSS/ETSDAC proposed by the present invention
It applies in one machine infinity bus system, for controlling Line Flow and busbar voltage, the specific steps are as follows:
1) one machine infinity bus system is built under ADPSS/ETSDAC emulation platform, as shown in Figure 1.Wherein, it is filled on route
It is distributed formula flow controller series side current transformer model, VSC-SEx (x=a, b, c) is respectively series side a, b, c three-phase unsteady flow
Device equivalent model.Side current transformer in parallel is divided into VSC-SH1 and VSC-SH2 two parts, and VSC-SH1 connects with bus, VSC-SH2 with
Transformer T1 neutral point connects.
Sending end generator G1 voltage is Vs, and receiving end generator G2 voltage is Vr.1 impedance of route is XL1, and route 2 hinders
Resist for XL2, the Y- △ transformer at first and last end is respectively T1 and T2, and series transformer is respectively T3, T4, T5, and design parameter is as follows:
Whole network voltage grade (reference voltage) be 220KV, reference capacity 100MVA, behind all amounts with per unit value table
Show.0 ° of ∠ of G1 voltage Vs=1, ∠ -8.7 ° of Vr=0.95 of G2 voltage；XL1=0.0052+j0.0413, XL2=0.0207+
j0.1653；Transformer T1 and T2 no-load voltage ratio are 220kV/220kV, equivalent impedance 0.0030+j0.1300, transformer T3,
T4, T5 no-load voltage ratio are 100kV/100kV, equivalent impedance 0.0002+j0.0020.
2) the electro-magnetic transient equivalent model of DPFC parallel connection side is built on ADPSS/ETSDAC emulation platform.
2.1) DPFC parallel connection side current transformer is divided into two, and one is the current transformer VSC-SH1 to connect with bus, the other is
The VSC-SH2 to connect with transformer T1 neutral point.The control target of VSC-SH1 is system voltage V1 and VSC-SH1 and VSC-SH2
Between active power balance relationship, and VSC-SH2 main function be generate 3 subharmonic currents.
2.2) as shown in Fig. 2, given system voltage V1.ref compared with system virtual voltage V1 deviation signal, pass through
The reactive current component Ishq* injected needed for VSC-SH1 to system is obtained after PI controller；Current transformer DC capacitor in side in parallel
The control of voltage can pass through reality with the active power balance relationship between parallel converters VSC-SH1 and VSC-SH2 come equivalent
When measurement VSC-SH2 issue active-power P sh3, be compared to obtain deviation signal with Psh1 using Psh3, by deviation signal
The active current Ishd* injected to system is obtained after PI controller.Then, busbar voltage is obtained using phase-locked loop pll
The phase angle wt (phase angle changes between 0~2 π) of V1, by Ishd* and Ishq* by three-phase park inverse transformation, as shown in figure 8, obtaining
The three-phase current that VSC-SH1 is injected to system instructs Isha, Ishb, Ishc.Required current-order is input to the controlled electricity of three-phase
In stream source, it is made to can produce corresponding electric current；
2.3) parallel connection side current transformer VSC-SH2 is that 3 subharmonic currents generate link, by inputting to single-phase controlled current source
The expectation amplitude (per unit value) of I3 simultaneously makes it carry out multiplying with 150Hz unit sine wave, and 3 subharmonic currents are obtained after operation
Instruction is input in controlled current source and single-phase inverters can be realized to system 3 subharmonic currents of injection.Specific such as Fig. 3
It is shown.
3) the electro-magnetic transient equivalent model of DPFC series side is built in ADPSS/ETSDAC emulation platform.
3.1) on the one hand the effect of series converter is to maintain its own base using 3 subharmonic currents of side in parallel sending
Equilibrium relation between the active Pse1 of wave and the active Pse3 of 3 subharmonic generates corresponding 3 subharmonic voltage to absorb 3 subharmonic
Wave power；On the other hand it is the response to system load flow demand, generates corresponding fundamental frequency voltages to control Line Flow；Due to string
The output for joining current transformer is the superimposed voltage of fundamental voltage and 3 subharmonic voltages, therefore its control can be divided into fundamental voltage
The control of control and 3 subharmonic voltages.
3.2) output of fundamental voltage depends on the demand of system load flow, for the output upper limit for limiting fundamental voltage, this hair
Bright to use double -loop control, outer ring is power ring, and inner ring is Voltage loop, as shown in Figure 6,7 respectively.By given active power
PL.ref, given reactive power Q L.ref are compared to obtain deviation signal with system active-power P L, reactive power Q L respectively
Perr, Qerr, Perr and Qerr obtained after PI controller respectively the voltage control signal V21q.ref of inner ring with
V21d.ref, V21q.ref and V21d.ref are clipping output, and purpose is to guarantee inner ring Setting signal in a certain range, with this
Limit the series side fundamental voltage upper limit；The series connection electromotive force V21 that measurement series side current transformer generates on the line, utilizes DFT mould
Block extracts the amplitude and initial phase angle of V21 Yu head end voltage V1 ' respectively, is calculated by single-phase park conversion module, obtains fundamental wave string
Join d, q the axis component V21d and V21q of electromotive force, as shown in Figure 9；Respectively by V21d.ref, V21q.ref and V21d, V21q into
Row relatively obtains deviation signal V21d.err, V21q.err, and the output of series side current transformer is finally obtained after PI controller
D, q the component Vsed.1 and Vseq.1 of fundamental voltage, the phase angle (V1A voltage phase angle is refered in particular in figure) with PLL output are with reference to phase
Vsed and Vseq is carried out single-phase park inverse transformation, finally obtains fundamental voltage Vse1x (its of series side current transformer output by angle
Middle x=a, b, c refer in particular to Vse1a in figure), as shown in Figure 10.
3.3) size of 3 subharmonic voltage Vse3 depends on the demand of series converter active-power P se1, real-time measurement
The fundamental active power Pse1 of series side current transformer and systems exchange is acquired by V12d.3ref=Pse1/0.5/ (I3/3)
The value of V12d.3, as shown in figure 4, in order to avoid series side current transformer and 3 subharmonic reactive power of systems exchange, therefore
V12q.3ref is set as 0；The series connection electromotive force V12 that measurement series side current transformer generates on the line, is mentioned respectively using DFT block
The amplitude and initial phase angle for taking V12 and 3 subharmonic current I3 are calculated by single-phase park conversion module, obtain 3 subharmonic series electricals
D, q the axis component V12d.3 and V12q.3 of kinetic potential, as shown in figure 11；Respectively by V12d.3ref, V12q.3ref and V12d.3,
V12q.3 is compared to obtain deviation signal V12d.err, V12q.err, and series side current transformer is finally obtained after PI controller
D, q the component Vsed.3 and Vseq.3 of 3 subharmonic voltages of output, as shown in Figure 5.The phase of 3 subharmonic currents is obtained using PLL
(phase angle changes angle wt3 between 0~2 π, and single-phase time switch SinglePhaseBreaker-460i side electric current is humorous 3 times in figure
Wave electric current I3), by Vsed.3 and Vseq.3 by single-phase park inverse transform module, obtain 3 subharmonic of single-phase converter output
Voltage Vse3x (wherein x=a, b, c, figure in refer in particular to Vse3a), as shown in figure 12.Finally Vse1+Vse3 is input to corresponding
Controlled voltage source makes it generate superimposed expectation voltage Vse, realizes the regulation to system load flow.
4) in emulation, the active power given value of busbar voltage given value V1.ref, charged line need to be accessed to DPFC
PL.ref, reactive power given value QL.ref, the instruction of 3 subharmonic currents, PI controller parameter, clipping functional parameter and device
Switching time parameter etc. is configured.It is specific as follows:
Setting parallel converters VSC-SH1 making time is t1=3s, and VSC-SH2 is with series side current transformer making time
T2=5s.Access busbar voltage given value V1.ref=1,3 subharmonic current I3Instruction is the sinusoidal quantity that amplitude is equal to 0.9, line
The given value of road active power and reactive power is respectively PLref=0.4, QLref=0.1, and arrangement above is per unit value.
The d axis controller scale parameter of VSC-SH1 is 1, time of integration parameter is 0.1；When q axis controller scale parameter is 100, integrates
Between constant be 0.0001.The outer loop parameter of series side current transformer fundamental wave controller are as follows: active power ring controller scale parameter is
0.1, integration time constant 0.1；Reactive power controller scale parameter is 0.1, integration time constant 0.1.Series side becomes
Flow the inner ring ring of device fundamental wave controller are as follows: d axis controller scale parameter is 0.1, integration time constant 0.005；Q axis controller
Scale parameter is 0.1, integration time constant 0.005.3 subharmonic d axis controller scale parameter of series side current transformer is 1, accumulates
Divide time constant position 0.005；Q axis controller scale parameter is 1, integration time constant 0.001.Side Ishd in parallel and Ishq width
Value is limited to ± 0.3, and series side V21d.ref and V21q.ref amplitude are limited to ± 0.08, Vsed3 and Vseq3 amplitude and are limited to
±0.08。
Emulation can be started after setting completed, " curve output " column opening ADPSS curve can be clicked after emulation and is read
Room is look at, by response curve compared with given Line Flow (PLref, QLref) and busbar voltage (V1ref), if curve and given
Value is consistent, then it is feasible for verifying the electro-magnetic transient equivalent mathematical model of proposed DPFC, while demonstrating proposition of the present invention
New type of control method correctness.
Specific embodiment described herein is only an example for the spirit of the invention.The neck of technology belonging to the present invention
The technical staff in domain can make various modifications or additions to the described embodiments or replace by a similar method
In generation, however, it does not deviate from the spirit of the invention or beyond the scope of the appended claims.
Claims (1)
1. a kind of control method of the Distributed Power Flow controller based on ADPSS/ETSDAC modeling, which is characterized in that including
Step 1 builds one machine infinity bus system under ADPSS/ETSDAC emulation platform, wherein equipped with distributed tide on route
Stream controller series side current transformer model, VSC-SEx (x=a, b, c) are respectively the equivalent mould of series side a, b, c 3-phase power converter
Type；Side current transformer in parallel is divided into VSC-SH1 and VSC-SH2 two parts, and VSC-SH1 connects with bus, VSC-SH2 and transformer T1
Neutral point connects；
Sending end generator G1 voltage is Vs, and receiving end generator G2 voltage is Vr；1 impedance of route is XL1, and 2 impedance of route is
The Y- △ transformer of XL2, first and last end are respectively T1 and T2, and series transformer is respectively T3, T4, T5；
Step 2, the electro-magnetic transient equivalent model that DPFC parallel connection side is built on ADPSS/ETSDAC emulation platform；
Step 2.1, DPFC parallel connection side current transformer are divided into two, and one is the current transformer VSC-SH1 to connect with bus, the other is
The VSC-SH2 to connect with transformer T1 neutral point；The control target of VSC-SH1 is system voltage V1 and VSC-SH1 and VSC-SH2
Between active power balance relationship, and VSC-SH2 main function be generate 3 subharmonic currents；
Step 2.2, given system voltage V1.ref compared with system virtual voltage V1 deviation signal, after PI controller
Obtain the reactive current component Ishq* injected needed for VSC-SH1 to system；The control of current transformer DC capacitor voltage in side in parallel
Real-time measurement VSC- can be passed through with the active power balance relationship between parallel converters VSC-SH1 and VSC-SH2 come equivalent
The active-power P sh3 that SH2 is issued, is compared to obtain deviation signal with Psh1 using Psh3, by deviation signal through PI controller
The active current Ishd* injected to system is obtained afterwards；Then, the phase angle wt of busbar voltage V1 is obtained using phase-locked loop pll,
By Ishd* and Ishq* by three-phase park inverse transformation, obtain the three-phase current that VSC-SH1 inject to system instruct Isha,
Ishb,Ishc；Required current-order is input in three-phase controlled current source, it is made to can produce corresponding electric current；
Step 2.3, parallel connection side current transformer VSC-SH2 are that 3 subharmonic currents generate link, by inputting to single-phase controlled current source
The expectation amplitude of I3 simultaneously makes it carry out multiplying with 150Hz unit sine wave, and the instruction of 3 subharmonic currents is obtained after operation, will
It, which is input in controlled current source, can be realized single-phase inverters to system 3 subharmonic currents of injection；
Step 3, the electro-magnetic transient equivalent model that DPFC series side is built in ADPSS/ETSDAC emulation platform；
On the one hand the effect of step 3.1, series converter is to maintain its own base using 3 subharmonic currents of side in parallel sending
Equilibrium relation between the active Pse1 of wave and the active Pse3 of 3 subharmonic generates corresponding 3 subharmonic voltage to absorb 3 subharmonic
Wave power；On the other hand it is the response to system load flow demand, generates corresponding fundamental frequency voltages to control Line Flow；Due to string
The output for joining current transformer is the superimposed voltage of fundamental voltage and 3 subharmonic voltages, therefore its control can be divided into fundamental voltage
The control of control and 3 subharmonic voltages；
The output of step 3.2, fundamental voltage depends on the demand of system load flow, for the output upper limit for limiting fundamental voltage, this hair
Bright to use double -loop control, outer ring is power ring, and inner ring is Voltage loop, as shown in Figure 6,7 respectively；By given active power
PL.ref, given reactive power Q L.ref are compared to obtain deviation signal with system active-power P L, reactive power Q L respectively
Perr, Qerr, Perr and Qerr obtained after PI controller respectively the voltage control signal V21q.ref of inner ring with
V21d.ref, V21q.ref and V21d.ref are clipping output, and purpose is to guarantee inner ring Setting signal in a certain range, with this
Limit the series side fundamental voltage upper limit；The series connection electromotive force V21 that measurement series side current transformer generates on the line, utilizes DFT mould
Block extracts the amplitude and initial phase angle of V21 Yu head end voltage V1 ' respectively, is calculated by single-phase park conversion module, obtains fundamental wave string
Join d, q the axis component V21d and V21q of electromotive force, as shown in Figure 9；Respectively by V21d.ref, V21q.ref and V21d, V21q into
Row relatively obtains deviation signal V21d.err, V21q.err, and the output of series side current transformer is finally obtained after PI controller
D, q the component Vsed.1 and Vseq.1 of fundamental voltage carry out Vsed and Vseq single using the phase angle of PLL output as Reference Phase Angle
Phase park inverse transformation finally obtains the fundamental voltage Vse1x of series side current transformer output；
Step 3.3, the size of 3 subharmonic voltage Vse3 depend on the demand of series converter active-power P se1, real-time measurement
The fundamental active power Pse1 of series side current transformer and systems exchange is acquired by V12d.3ref=Pse1/0.5/ (I3/3)
The value of V12d.3, in order to avoid series side current transformer and 3 subharmonic reactive power of systems exchange, therefore V12q.3ref is set as 0；
The series connection electromotive force V12 that measurement series side current transformer generates on the line extracts V12 and 3 subharmonic electricity using DFT block respectively
The amplitude and initial phase angle for flowing I3 are calculated by single-phase park conversion module, obtain d, q axis component of 3 subharmonic series connection electromotive force
V12d.3 and V12q.3, respectively by V12d.3ref, V12q.3ref is compared to obtain deviation signal with V12d.3, V12q.3
V12d.err, V12q.err finally obtain d, q component of 3 subharmonic voltages of series side current transformer output after PI controller
Vsed.3 and Vseq.3 obtains the phase angle wt3 of 3 subharmonic currents using PLL, and Vsed.3 and Vseq.3 is inverse by single-phase park
Conversion module obtains 3 subharmonic voltage Vse3x of single-phase converter output, is finally input to Vse1+Vse3 corresponding controlled
Voltage source makes it generate superimposed expectation voltage Vse, realizes the regulation to system load flow；
Step 4, emulation when, need to DPFC access busbar voltage given value V1.ref, charged line active power given value
PL.ref, reactive power given value QL.ref, the instruction of 3 subharmonic currents, PI controller parameter, clipping functional parameter and device
Switching time parameter etc. is configured；It is emulated after setting completed, " curve output " column opening can be clicked after emulation
ADPSS curve reading room, by response curve compared with given Line Flow PLref, QLref and busbar voltage V1ref, if curve
Consistent with given value, then it is feasible for verifying the electro-magnetic transient equivalent mathematical model of proposed DPFC.
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