CN109038691A - Hybrid power electronic transformer frequency modulation and voltage modulation control strategy based on virtual inertia - Google Patents
Hybrid power electronic transformer frequency modulation and voltage modulation control strategy based on virtual inertia Download PDFInfo
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- CN109038691A CN109038691A CN201810751123.7A CN201810751123A CN109038691A CN 109038691 A CN109038691 A CN 109038691A CN 201810751123 A CN201810751123 A CN 201810751123A CN 109038691 A CN109038691 A CN 109038691A
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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
- H02J3/48—Controlling the sharing of the in-phase component
-
- 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
- H02J3/50—Controlling the sharing of the out-of-phase component
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M5/00—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases
- H02M5/40—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc
- H02M5/42—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters
- H02M5/44—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters using discharge tubes or semiconductor devices to convert the intermediate dc into ac
- H02M5/453—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters using discharge tubes or semiconductor devices to convert the intermediate dc into ac using devices of a triode or transistor type requiring continuous application of a control signal
- H02M5/458—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters using discharge tubes or semiconductor devices to convert the intermediate dc into ac using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M5/4585—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters using discharge tubes or semiconductor devices to convert the intermediate dc into ac using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only having a rectifier with controlled elements
Abstract
The invention discloses a kind of hybrid power electronic transformer frequency modulation and voltage modulation control strategy based on virtual inertia, main circuit topology includes power distribution network multiwinding transformer, series-parallel converter, filter and static switch back-to-back, and series-parallel converter back-to-back includes two level AC/DC rectification unit of three-phase and full-bridge inverting unit；Active and reactive power equation is established based on virtual synchronous machine, realize voltage compensation includes the active frequency modulation of prime, idle Regulation Control strategy and latter stage grid current control method and outer voltage current inner loop two close cycles Voltage Stability Control.The present invention provides new resolving ideas for the common Voltage Drop problem of power distribution network, combines the function of high-capacity power transmission and power quality controlling, has preferable practical value.
Description
Technical field
The invention belongs to the application field of power electronic devices in the power system, more particularly to one kind to be based on virtual inertia
Hybrid power electronic transformer frequency modulation and voltage modulation control strategy.
Background technique
Load due to power electronic devices and the increasingly integrated development of more distributed generation systems, in electric system
Feature has occurred that revolutionary variation.The cutting variation of such as failure, heavy load and atmospheric discharge are in alternating current simultaneously
Dynamical state in Force system produces adverse effect to power grid, such as voltage fluctuation, harmonic wave increase and reactive current increases.Cause
This modern society needs to develop the more reliable supply of high quality power towards the transformation of digital Age, and modern power systems are for electricity
The requirement of energy quality is higher and higher.
Power transformer carries the important function such as power transmission and transformation as device most basic in electric system, but excessively single
One function makes traditional power transformer be increasingly difficult to the high request to meet modern power systems for power quality.And
And there is also following disadvantages for traditional power transformer: volume, weight are big, and transformer insulation oil generates adverse effect to environment；It is empty
Load-loss is higher；Output voltage decline is easily led to when bringing onto load；When load side breaks down, failure can not be quickly isolated, thus
Lead to failure propagation；When band nonlinear load, distortion current enters power grid by transformer coupled, pollutes to power grid；Electricity
When Source side voltage is interfered, and it can be transmitted to load side, lead to the influence to sensitive load；Need matched relevant device pair
It is protected；In addition, harmonic wave can be generated when core sataration, biggish excitation surge current also will cause when putting into power grid.Cause
This, the shortcomings that combining with traditional power transformer by power electronics wholly-controled device, make up traditional transformer, hybrid power
Electronic transformer comes into being.Mixed type distribution transformer can not only play the role of power transmission and transformation, but also can be to electric energy
Quality is detected, and reactive compensation and Voltage Stability Control are played the role of.
Summary of the invention
Goal of the invention: in view of the above problems, the present invention proposes a kind of hybrid power electronic transformer based on virtual inertia
Device frequency modulation and voltage modulation control strategy.
Technical solution: to achieve the purpose of the present invention, the technical scheme adopted by the invention is that: a kind of hybrid power electricity
Sub- transformer, including multiwinding transformer and three Monophase electric power electronics back-to-back converter in series and parallel；
The multiwinding transformer include ferromagnetic core, first side winding, secondary side main winding and secondary side phase shift auxiliary around
Group；The first side winding is triangle connection, and the secondary side main winding is star-like connection, and draws zero by neutral point
Line, the secondary side phase shift auxiliary winding are triangle connection；
The first side winding connects power grid；Three lists are connected in series via static switch in the secondary side main winding
Phase power electronics connects load after back-to-back converter outlet side in series and parallel；The secondary side phase shift auxiliary winding is via filter
Being connected to three Monophase electric power electronics, back-to-back converter, output end are connected to load through LC filter in series and parallel；It is described
For static switch in failure, by three Monophase electric power electronics, back-to-back converter switching is grid-connected in series and parallel.
Further, back-to-back converter includes two level full-controlled rectifier of prime three-phase to the Monophase electric power electronics in series and parallel
Three switching bridges, the capacitors that bridge, 6 switching devices are constituted, are connected in parallel and rear class inversion at least one described switching bridge
H bridge；At least one described switching bridge is controlled to control the hybrid power electronic transformer the case where input voltage changes
Lower reduction output voltage variation.
Further, the two level full-controlled rectifier bridge of prime three-phase includes 6 IBGT and 6 anti-parallel diodes,
Every two IGBT and anti-parallel diodes head and the tail are composed in series a bridge arm, constitute three bridge arms, the midpoint of each bridge arm with
The secondary side phase shift auxiliary winding of the phase multiwinding transformer connects；The two level full-controlled rectifier bridge output stage of prime three-phase with
DC link is connected.
Further, the rear class inversion H bridge includes 4 IGBT and 4 anti-parallel diodes, every two IGBT and anti-
It is composed in series a bridge arm to parallel diode head and the tail, two bridge arms is constituted, is leaned against in series and parallel as the Monophase electric power electronics
Carry on the back the output port of converter.
A kind of hybrid power electronic transformer frequency modulation and voltage modulation control strategy based on virtual inertia, in virtual synchronous machine
On the basis of, active and reactive power equation is established, prime realizes active frequency modulation, idle Regulation Control, and rear class realizes grid-connected current control
System and outer voltage current inner loop two close cycles Voltage Stability Control.
Further, the prime AC/DC it is active-frequency control: according to the mechanical equation of virtual synchronous motor, excitation side
Cheng Jianli prime AC/DC is active-frequency control, according to the fluctuation situation of higher level's mains frequency, transient change controller provides function
Rate buffering Δ P can guarantee that load side frequency is constant.
Further, the prime AC/DC it is idle-voltage control: according to the mechanical equation of virtual synchronous motor, excitation side
Cheng Jianli prime AC/DC is idle-voltage control, it is defeated by changing controller input stage according to higher level's grid voltage sags situation
Voltage magnitude out, to change the reactive power exchanged between higher level's power grid and the hybrid power electronic transformer.
Further, the latter stage grid current control: by opening up in conjunction with the hybrid power electronic transformer is grid-connected
Structure and the electrical equation of virtual synchronous motor are flutterred, quasi- ratio resonant controller is used for the tracking of obtained current command signal
It realizes.
Further, the outer voltage current inner loop two close cycles Voltage Stability Control: by using synchronous reference structure
The capacitor of proportional plus integral control, acquisition LC filtering link exports electric current iCPass through the vertical signal generator based on all-pass filter
A virtual vertical signal is generated, converts to obtain the signal based on d axis and q axis by α β/dq0, then inner ring is used to electric current
PI closed-loop control, while being controlled using capacitance voltage outer ring PI, current inner loop control realizes the control for voltage stabilization.
The utility model has the advantages that phase-shifting transformer of the invention uses so that this kind of hybrid power electronic transformer will not generate
Unbalanced power can effectively inhibit unbalanced power supply degree and harmonic pollution；Based on virtual synchronous machine, foundation is corresponding with
Function, reactive power equation guarantee output power quality from frequency adjustment procedure, voltage adjustment process and Voltage Stability Control
Reliability, greatly improvement power quality index.
Detailed description of the invention
Fig. 1 is hybrid power electronic transformer topological structure circuit diagram；
Fig. 2 is front stage converter overall control block diagram；
Fig. 3 is real power control block diagram；
Fig. 4 is idle control block diagram；
Fig. 5 is rear class voltage compensation two close cycles block diagram.
Specific embodiment
Further description of the technical solution of the present invention with reference to the accompanying drawings and examples.
As shown in Figure 1, hybrid power electronic transformer schematic diagram of the present invention, including multiwinding transformer and three
A Monophase electric power electronics back-to-back converter in series and parallel；Multiwinding transformer includes ferromagnetic core, the side 10kV winding, a secondary side
400V/200kVA main winding and secondary 220V/20kVA sidesway phase auxiliary winding.
First side winding is triangle connection, avoids triple-frequency harmonics from flowing into power grid and formed to power grid and pollutes；Secondary side master around
Group is star-like connection, and draws zero curve by neutral point；Secondary side phase shift auxiliary winding is triangle connection, the angle of three-phase phase shifting
Degree is respectively+20 °, 0 °, -20 °.It is coupled not when power grid mutually breaks down, and phase-shifting transformer is compensated in original this
Unbalanced power can be generated, rectification harmonic wave is few, and infusion circuit ripple is small.
First side winding connects power grid；Three Monophase electric power electronics strings are connected in series via static switch in secondary side main winding
Load is connected after converter outlet side back-to-back in parallel；Secondary side phase shift auxiliary winding is connected to three single-phase electricities via filter
Back-to-back converter, output end are connected to load through LC filter to power electronics in series and parallel；Advantage is that rectification harmonic wave is few, injection electricity
Net voltage and current ripple is small, while when a certain phase circuit of secondary side main winding is broken down, static switch is in failure, by three
Back-to-back converter switching is grid-connected in series and parallel for a Monophase electric power electronics.
Back-to-back converter includes two level full-controlled rectifier bridge of prime three-phase, 6 switching dresses to Monophase electric power electronics in series and parallel
Three switching bridges, capacitors for setting composition, are connected in parallel and rear class inversion H bridge at least one switching bridge；Control at least one
Switching bridge reduces output voltage variation to control hybrid power electronic transformer in the case where input voltage changes.
Two level full-controlled rectifier bridge of prime three-phase includes 6 IBGT and 6 anti-parallel diodes, every two IGBT and anti-
It is composed in series a bridge arm to parallel diode head and the tail, constitutes three bridge arms, the midpoint of each bridge arm and the phase Multiple coil transformation
The secondary side phase shift auxiliary winding of device connects；Two level full-controlled rectifier bridge output stage of prime three-phase is connected with DC link.
Rear class inversion H bridge includes 4 IGBT and 4 anti-parallel diodes, every two IGBT and anti-parallel diodes
Head and the tail are composed in series a bridge arm, constitute two bridge arms, the output end as Monophase electric power electronics back-to-back converter in series and parallel
Mouthful.3 Monophase electric power electronics back-to-back converter in series and parallel, is connected to phase shift auxiliary winding via filter, can be used for will be electric
Pressure carries out the conversion between AC/DC and DC/AC, then accesses load power grid via LC filter.
As shown in Fig. 2, the hybrid power electronic transformer frequency modulation and voltage modulation control strategy based on virtual inertia, virtual same
Active and reactive power equation is established on the basis of step machine, prime realizes active frequency modulation, idle Regulation Control and latter stage grid electric current
Control method and outer voltage current inner loop two close cycles Voltage Stability Control.
As shown in figure 3, prime it is active-frequency control, before the mechanical equation of virtual synchronous motor, excitation establishing equation
Grade AC/DC is active-frequency control, according to the fluctuation situation of higher level's mains frequency, transient change controller provides power and buffers Δ P
It can guarantee that load side frequency is constant.
Based on synchronous electric motor rotor mechanical property, expression formula equation is as follows:
In above formula: J is synchronous motor rotary inertia；The permanent damped coefficient of D；ω is synchronized angular speed；T0For machinery
Torque；T is electromagnetic torque.Relationship between active power and angular frequency is specially following expression:
δ=∫ ω dt
In above formula: P is instantaneous active power；P0For the grid-connected active command of input stage；Including rated active power PmAnd frequency
Response regulation power PfTwo parts.Obtain following expression:
P0=Pm+Pf
PmIt is obtained by direct current pressure ring:
In above formula, KpdFor PI controller proportionality coefficient；KidFor integral coefficient；UdciFor DC bus-bar voltage sampled value；
For DC bus-bar voltage given value.To adjust higher level's mains frequency, frequency modulation frequency modulation link need to be introduced, frequency response adjusts function
Rate PfIt is embodied as:
Pf=kf(f-f0)
In above formula, f is power distribution network actual frequency, f0For rated frequency, kfFor frequency response coefficient.Then as frequency f=f0
When, P at this timef=0, P0=Pm；When frequency f falls i.e. f < f0When, P at this timef< 0, P0<Pm；It is f > f when frequency f rises0When, at this time
Pf> 0, P0>Pm。
When device is when the frequency for participating in higher level's power distribution network is adjusted, providing low-pressure side load by energy storage device, there is function
Shortage of power Δ P, i.e., when frequency f falls, shortage of power Δ P > 0, energy storage device works in discharge condition, issues power；When frequency
When rate f rises, shortage of power Δ P < 0, energy storage device works in charged state, absorbs power, function is realized after control algolithm
The balance of rate, i.e. Pm=P0+ Δ P meets consumption of the load to power.Due to the presence of factor of inertia J and damped coefficient D, have
The Inertia Characteristics and damping characteristic for increasing to effect system support the frequency stabilization of power grid and damp the oscillation of output power.
If higher level's mains frequency does not fluctuate, Δ P=0, Pm=P0；If higher level's mains frequency falls, at this time
Hybrid power electronic transformer is that keep frequency is constant, and power absorption, i.e. P should be reduced under the control action of controller0Subtract
Small, energy storage device output power Δ P > 0 meets load power consumption；When higher level's mains frequency rises, pass through identical control
Mechanism, the final power consumption for meeting load.
As shown in figure 4, idle-voltage control, according to the mechanical equation of virtual synchronous motor, excitation establishing equation prime
AC/DC is idle-voltage control, according to higher level's grid voltage sags situation, by the voltage amplitude for changing the output of controller input stage
Value, to change the reactive power exchanged between higher level's power grid and the hybrid power electronic transformer.
Based on its output voltage of hybrid power electronic transformer, amplitude EpExpression formula are as follows:
In above formula: E0For benchmark voltage magnitude；kqFor idle proportional control factor；kvFor pressure regulation proportional control factor；K is
Integral adjustment coefficient；QrefFor grid-connected reactive command；U0It is respectively to hold voltage magnitude and distribution network voltage virtual value with U.It is then idle
Control includes two parts: first is that reactive-load track controls, by setting reactive command QrefTrack the instantaneous reactive function of higher level's power distribution network
Rate can obtain idle control amount Δ EQ.Second is that voltage support controls, according to end voltage magnitude U0Between distribution network voltage virtual value U
Deviation obtains idle control amount Δ EU；Regulate and control virtual excitation k/s, output voltage amount of support Δ E, realizes voltage support.
If Voltage Drop occurs for higher level's power grid, hybrid power electronic transformer changes defeated under the control action of controller
Enter the output voltage amplitude of grade, so that its reactive power for exchanging between higher level's power grid, supports by issuing reactive power
The voltage stabilization of power distribution network；Similarly if voltage rising occurs for higher level's power grid, hybrid power electronic transformer is by absorbing nothing
The voltage stabilization of function power support power grid.
Latter stage grid current control, by conjunction with the hybrid power electronic transformer grid connection topology structure and virtually same
The electrical equation of motor is walked, the tracking of obtained current command signal is realized using quasi- ratio resonant controller.
According to principal current topological structure, in conjunction with the electrical equation of virtual synchronous motor, grid-connected current command signal irefAre as follows:
To grid-connected current given value irefTracking realized by using quasi- ratio resonant controller, the transmitting letter of controller
Number is as follows:
In above formula, KpAnd KrSubject to ratio resonant controller proportionality coefficient and resonance coefficient；ωcFor cutoff frequency.To
By transient current i to grid-connected current irefTracing control obtains hybrid power electronic converter entirety modulated signal upwmaFor
Following expression:
upwma=Gpp(S)(i-iref)
For grid-connected current given value irefTracking realized by using quasi- ratio resonant controller, while will instantaneous electricity
It flows i and grid-connected current instructs irefTracing control obtains input stage entirety modulated signal u more afterwardspwma。
As shown in figure 5, outer voltage current inner loop two close cycles Voltage Stability Control, by using synchronous reference structure proportion
The capacitor of integration control, acquisition LC filtering link exports electric current iCIt is generated by the vertical signal generator based on all-pass filter
One virtual vertical signal is converted to obtain the signal based on d axis and q axis by α β/dq0, then is closed to electric current using inner ring PI
Ring control, while being controlled using capacitance voltage outer ring PI, current inner loop control realizes the control for voltage stabilization.
The control method of Voltage Stability Control single-phase inversion H bridge type circuit is controlled by using synchronous reference structure PI, is drawn
Enter a virtual vertical signal, convert two-phase control system for monophase system, is referred to by α β/dq0 coordinate transform
Voltage signal obtains reference current by pi regulator and detected output electric current work is poor, and acquired results are passing through inversion
The input of PWM modulation is got in return, to obtain the control signal of driving full-control type IGBT.
The difference model of single-phase H bridge type inverter circuit is as follows:
In above formula, u is control variable.
In single-phase inversion bridge circuit, the driving signal of wholly-controled device in order to obtain, using being based on all-pass filter APF
Vertical signal generator OSG generate a virtual vertical signal, inverter bridge output voltage is denoted as vα, via single order all-pass
The imaginary vertical signal that filter generates is vβ, then the transmission function of APF input and output such as following formula:
In above formula, ωfFor basic angular frequency.
By using synchronization reference model come to output voltage carry out real-time control, current inner loop play simultaneously transient state and surely
State control, electric voltage feed forward path improves the robustness of system.Inverter bridge output voltage v is acquired, the vertical letter based on APF is passed through
Number generator OSG generates two paths of signals, and former output voltage is vα, imaginary vertical signal is vβ, carried out α β/dq0 coordinate transform
Obtain the voltage signal v of d axis and q axisdAnd vq；By gained signal and reference signalWithIt is poor to make, and obtains d axis through pi regulator
With the reference current signal of q axisWithIt is obtained again through α β/dq0 coordinate inversionWith measured output electric current iCIt is poor to make,
Acquired results obtain the driving signal for mutually driving inverter bridge IGBT through obtaining the input of PWM generator after P adjuster.
Using the double-closed-loop control of outer voltage current inner loop, electric current loop flows through LC filter by acquisition inverter bridge and powers on
Hold the output electric current i of CCIt is poor that the reference current generated again with outer voltage is made, then realizes closed-loop control using P adjuster；When defeated
For voltage beyond stability range or when breaking down, static switch movement puts into series-parallel back-to-back converter out, to voltage into
Row real-time compensation.
Hybrid power electronic transformer frequency modulation and voltage modulation control strategy based on virtual inertia of the invention, mixed type electricity
Power electronic transformer not only has the basic functions such as the transmission of traditional transformer electric energy, voltage conversion, additionally it is possible to by electric energy matter
The detection of amount, judges needs improvement in time is broken down and whether deposited to electric system whether to step switch switching electric power electricity
Sub- device carries out the new function of related power quality controlling.According to the symmetry of topological characteristic and three-phase alternating current Force system, three
It is not coupled mutually independently of each other between phase, therefore can simplify pairs of every phase front stage convertor controls, adjusted by frequency, voltage
Adjusting and voltage compensation realize effective improvement to power quality.
Claims (9)
1. a kind of hybrid power electronic transformer, it is characterised in that: including multiwinding transformer and three Monophase electric power electronics
Series-parallel back-to-back converter；
The multiwinding transformer includes ferromagnetic core, first side winding, secondary side main winding and secondary side phase shift auxiliary winding；
The first side winding is triangle connection, and the secondary side main winding is star-like connection, and draws zero by neutral point
Line, the secondary side phase shift auxiliary winding are triangle connection；
The first side winding connects power grid；
The secondary side main winding is connected in series three Monophase electric power electronics via static switch and converts back-to-back in series and parallel
Load is connected after device outlet side；
The secondary side phase shift auxiliary winding is connected to three Monophase electric power electronics via filter and becomes back-to-back in series and parallel
Parallel operation, output end are connected to load through LC filter；
For the static switch in failure, by three Monophase electric power electronics, back-to-back converter switching is grid-connected in series and parallel.
2. hybrid power electronic transformer according to claim 1, it is characterised in that: the Monophase electric power electronics string is simultaneously
Joining back-to-back converter includes three switching bridges, the capacitors that two level full-controlled rectifier bridge of prime three-phase, 6 switching devices are constituted
Device, is connected in parallel and rear class inversion H bridge at least one described switching bridge；At least one described switching bridge is controlled to control
It states hybrid power electronic transformer and reduces output voltage variation in the case where input voltage changes.
3. hybrid power electronic transformer according to claim 2, it is characterised in that: two level of prime three-phase is complete
Controlling rectifier bridge includes 6 IBGT and 6 anti-parallel diodes, and every two IGBT and anti-parallel diodes head and the tail are composed in series
One bridge arm, constitutes three bridge arms, and the midpoint of each bridge arm and the secondary side phase shift auxiliary winding of the phase multiwinding transformer connect
It connects；The two level full-controlled rectifier bridge output stage of prime three-phase is connected with DC link.
4. hybrid power electronic transformer according to claim 2, it is characterised in that: the rear class inversion H bridge includes 4
A IGBT and 4 anti-parallel diodes, every two IGBT and anti-parallel diodes head and the tail are composed in series a bridge arm, constitute
Two bridge arms, the output port as the Monophase electric power electronics back-to-back converter in series and parallel.
5. a kind of hybrid power electronic transformer frequency modulation and voltage modulation control strategy based on virtual inertia, it is characterised in that: in void
On the basis of quasi- synchronous machine, active and reactive power equation is established, prime realizes active frequency modulation, idle Regulation Control, and rear class is realized
Grid-connected current control and outer voltage current inner loop two close cycles Voltage Stability Control.
6. the hybrid power electronic transformer frequency modulation and voltage modulation control strategy according to claim 5 based on virtual inertia,
It is characterized by: the prime AC/DC it is active-frequency control: according to the mechanical equation of virtual synchronous motor, excitation establishing equation
Prime AC/DC is active-frequency control, according to the fluctuation situation of higher level's mains frequency, transient change controller provides power buffering
Δ P can guarantee that load side frequency is constant.
7. the hybrid power electronic transformer frequency modulation and voltage modulation control strategy according to claim 5 based on virtual inertia,
It is characterized by: the prime AC/DC it is idle-voltage control: according to the mechanical equation of virtual synchronous motor, excitation establishing equation
Prime AC/DC is idle-voltage control, according to higher level's grid voltage sags situation, by the electricity for changing the output of controller input stage
Pressure amplitude value, to change the reactive power exchanged between higher level's power grid and the hybrid power electronic transformer.
8. the hybrid power electronic transformer frequency modulation and voltage modulation control strategy according to claim 5 based on virtual inertia,
It is characterized by: the latter stage grid current control: by conjunction with the hybrid power electronic transformer grid connection topology structure
With the electrical equation of virtual synchronous motor, the tracking of obtained current command signal is realized using quasi- ratio resonant controller.
9. the hybrid power electronic transformer frequency modulation and voltage modulation control strategy according to claim 5 based on virtual inertia,
It is characterized by: the outer voltage current inner loop two close cycles Voltage Stability Control: by using synchronous reference structure proportion product
The capacitor of sub-control system, acquisition LC filtering link exports electric current iCOne is generated by the vertical signal generator based on all-pass filter
A virtual vertical signal converts to obtain the signal based on d axis and q axis by α β/dq0, then uses inner ring PI closed loop to electric current
Control, while being controlled using capacitance voltage outer ring PI, current inner loop control realizes the control for voltage stabilization.
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| CN109888791A (en) * | 2019-01-25 | 2019-06-14 | 西安交通大学 | A kind of active distribution network and its control method based on hybrid distribution transformer |
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| US11694840B2 (en) * | 2019-12-20 | 2023-07-04 | Hitachi Energy Switzerland Ag | Transformer arrangement |
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| CN111049183A (en) * | 2019-12-25 | 2020-04-21 | 国网江苏省电力有限公司电力科学研究院 | Split type power electronic transformer structure and flexible switching control method thereof |
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| CN113300399A (en) * | 2021-04-30 | 2021-08-24 | 北京天诚同创电气有限公司 | Microgrid group central controller, microgrid group control method and microgrid group control system |
| CN114285294B (en) * | 2021-11-05 | 2023-12-22 | 国网浙江省电力有限公司嘉兴供电公司 | Direct type hybrid distribution transformer system and tide flexible regulation and control method thereof |
| CN114285294A (en) * | 2021-11-05 | 2022-04-05 | 国网浙江省电力有限公司嘉兴供电公司 | Direct hybrid distribution transformer system and power flow flexible regulation and control method thereof |
| CN114640141B (en) * | 2022-05-17 | 2022-08-05 | 浙江大学 | Network-building type fan control method for offshore wind power diode rectification unit sending-out system |
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| CN114640141A (en) * | 2022-05-17 | 2022-06-17 | 浙江大学 | Network-building type fan control method for offshore wind power diode rectification unit sending-out system |
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| CN116154845A (en) * | 2022-12-08 | 2023-05-23 | 中国石油大学(华东) | Control method of H-bridge serial-parallel switching type forced excitation converter based on DAB |
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