CN107565568A - Hybrid power electronic transformer and control method based on single star-like MMC structures - Google Patents
Hybrid power electronic transformer and control method based on single star-like MMC structures Download PDFInfo
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- CN107565568A CN107565568A CN201710749642.5A CN201710749642A CN107565568A CN 107565568 A CN107565568 A CN 107565568A CN 201710749642 A CN201710749642 A CN 201710749642A CN 107565568 A CN107565568 A CN 107565568A
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- Y02E40/30—Reactive power compensation
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Abstract
The invention discloses a kind of hybrid power electronic transformer and control method based on single star-like MMC structures, three-phase transformer, single star-like MMC, three-phase full-bridge inverter, dc bus, LC wave filters and contactor；The star-like MMC of list of each phase is connected in parallel on the corresponding transformer primary side winding coil by a primary side contactor, and the star-like MMC of three-phase list output-parallel is connected on common DC bus；The direct current input side of three-phase full-bridge inverter is connected on common DC bus, and exchange outlet side is after LC wave filters, in the star-like connection of access three-phase transformer vice-side winding of being connected by secondary contactor.The present invention carries out reactive-current compensation by entering Mobile state compensation and output current to power network output voltage, realizes the regulation of the power network quality of power supply, ensures the security, reliability and economy of operation of power networks, has certain novelty and feasibility and use value.
Description
Technical field
The invention belongs to applied technical field of the power electronic devices in power system, more particularly to one kind to be based on single star
The hybrid power electronic transformer and control method of type MMC structures.
Background technology
With development and application of the Power Electronic Technique in power system, electric power electric transformer is due to good
Quality of power supply regulating power receives the growing interest of people.The continuous expansion of power system network is to the reactive-load compensation in power network
Equipment and voltage recovery device propose higher requirement.
The voltage class born due to traditional electric power electric transformer is relatively low, power output is limited, and traditional transmission of electricity becomes
Depressor can not adjust the power network quality of power supply, and the presence of a large amount of reactive powers had both occupied the capacity of transmitting transformer, and also increased
The loss of electric energy in electricity transmission process.In order to realize that the dynamic electric voltage of voltage levels recovers the reactive-current compensation with Large Copacity,
There is single star-like MMC electric power electric transformer topological structure.
The content of the invention
Goal of the invention：For problem above, the present invention proposes a kind of hybrid power electronics based on single star-like MMC structures
Transformer and control method, with reference to the big advantage of traditional transformer transmission capacity and the power electronics transformation of single star-like MMC structures
The characteristics of device is strong to power grid quality regulating power.
Technical scheme：To realize the purpose of the present invention, the technical solution adopted in the present invention is：One kind is based on single star-like
The hybrid power electronic transformer of MMC structures, three-phase transformer, primary side contactor, the star-like MMC of three-phase list, public direct-current are female
Line, three-phase full-bridge inverter, LC wave filters and secondary contactor；Three-phase transformer primary side winding is connected using triangle, secondary
Winding uses star-like connection；The star-like MMC of list of each phase is connected in parallel on the corresponding transformer primary by a primary side contactor
On the winding coil of side, the star-like MMC of three-phase list output-parallel is connected on common DC bus；The direct current of three-phase full-bridge inverter
Input side is connected on common DC bus, and exchange outlet side passes through secondary contactor series connection access three after LC wave filters
In the star-like connection of phase transformer vice-side winding.
Further, the star-like MMC of the list of each phase is in series by some half-bridge modules, and each half-bridge module includes half-bridge
Rectification circuit, DC filter capacitor and DHB isolated form DC/DC converters；The input side series half-bridge rectification circuit of half-bridge module,
It is filtered after Half bridge rectifier circuit by DC filter capacitor, then by DHB isolated form DC/DC converters by high straightening
Flowing voltage reduces, and is connected on common DC bus.
A kind of control method of the hybrid power electronic transformer based on single star-like MMC structures, the control method bag
Include reactive-current compensation control and dynamic voltage compensation control；MMC star-like to three-phase list is entered using the method for closed-loop current control
Row reactive-current compensation；Dynamic voltage compensation is carried out using the method for Double closed-loop of voltage and current to three-phase inverter.
Further, the reactive-current compensation control calculates comprising reactive power, compensation Current calculation, compensation electric current close
Ring control, DC bus-bar voltage closed-loop control and PWM controls；The reactive power of transmitting transformer is calculated, is mended according to reactive current
The limitation for repaying ratio and single star-like MMC output currents calculates reactive-load compensation electric current, passes through closed-loop current control and dc bus electricity
Closed-loop control is pressed, control signal compensates through PWM controlling switch device to reactive current.
Further, the dynamic voltage compensation control includes offset voltage calculating, Double closed-loop of voltage and current and PWM
Control；Offset voltage is calculated, it is inverse by Double closed-loop of voltage and current and PWM controlling switch device, control three phase full bridge
Become the voltage of device.
Beneficial effect：Hybrid power electronic transformer of the present invention based on single star-like MMC structures has reactive current benefit
Ability and dynamic voltage compensation ability are repaid, can be directly applied for connecting between different voltage class power networks；Single star-like MMC structures are whole
Stream prime reduces IGBT quantity using half-bridge structure, generally reduces the quantity of switching device, reduces cost；Can be
The comprehensive regulation of the quality of power supply is realized while realizing high capacity transmission power.
Brief description of the drawings
Fig. 1 is hybrid power electronic transformer topology diagram of the present invention based on single star-like MMC structures；
Fig. 2 is single star-like MMC control block diagrams of the invention；
Fig. 3 is DHB voltage balancing controls block diagram of the present invention；
Fig. 4 is three-phase full-bridge inverter control block diagram of the present invention.
Embodiment
Technical scheme is further described with reference to the accompanying drawings and examples.
It is the hybrid power electronic transformer topological diagram of the present invention based on single star-like MMC structures as shown in Figure 1,
Applied in transmission system, the hybrid power electronic transformer topological structure include three-phase transformer, the star-like MMC of three-phase list,
Primary side contactor, common DC bus, three-phase full-bridge inverter, LC wave filters, secondary contactor etc..
Three-phase transformer includes primary side winding and vice-side winding, wherein, transformer primary side winding is connected using triangle, even
High-pressure side network is connect, vice-side winding uses star-like connection.
A, B, C three-phase high-voltage side are in parallel with the star-like MMC of three-phase list respectively, and it is relative that the star-like MMC of list of each phase is connected in parallel on this
On the primary side winding coil answered, connected by primary side contactor 1.The star-like MMC of list of each phase connected by some half-bridge modules and
Into each half-bridge module is made up of prime Half bridge rectifier circuit, DC filter capacitor, DHB isolated form DC/DC converters.Half-bridge
The input stage of module is filtered by Half bridge rectifier circuit connected in series after Half bridge rectifier circuit by a DC filter capacitor
Ripple, then reduced high-voltage dc voltage by DHB isolated form DC/DC converters, it is connected on common DC bus, three-phase owns
Half-bridge module DHB outlet sides are connected in parallel on common DC bus, i.e. all half-bridge moulds of the star-like MMC of low-pressure side network three-phase list
The DC side of block connects and composes a stable common DC bus.
A, the star-like MMC topological structures of B, C three-phase list, it is three independent phase separation structures.Both ends per mutually single star-like MMC are simultaneously
It is associated between primary transformer coil winding side and neutral point.The star-like MMC units of three-phase list realize compensation and the dimension of reactive current
Hold the stable function of DC bus-bar voltage.The star-like MMC upper ends of three-phase list are connected to the high-pressure side of transformer by contactor 1, under
End interconnects.
The DC side of three-phase full-bridge inverter is connected on common DC bus, exchange outlet side series connection access three-phase transformation
It is real by injecting positive sequence, negative phase-sequence and residual voltage in the vice-side winding to transmitting transformer in the star-like connection of device vice-side winding
The function of existing dynamic voltage compensation.As dynamic voltage compensation module, its DC side is connected to public straight three-phase full-bridge inverter
Flow on bus, AC is by LC filters in series access transformer secondary winding.
Three-phase full-bridge inverter structure includes 6 IGBT, 6 anti-parallel diodes, LC wave filters.Three phase full bridge inversion
The output voltage of device is connected after LC wave filters accesses transformer secondary three-phase star winding, is connected by secondary contactor 2,
Dynamic offset voltage failure.
Single star-like MMC mathematical modelings and three-phase full-bridge inverter mathematical modeling are established, current closed-loop is used to single star-like MMC
The method of control, maintain DC side busbar voltage stable and realize the compensation of reactive current, to three-phase inverter using voltage electricity
The method of double-closed-loop control is flowed, controls the output voltage of three-phase inverter.
Measure voltage ＆ current link includes the three-phase phase voltage u of detection secondary transformer outputa、ub、uc, secondary line
Enclose the three-phase phase current i of outputa、ib、ic, the star-like MMC of three-phase list input current isa、isb、isc, three-phase full-bridge inverter output
Electric current iLa、iLb、iLc, three-phase full-bridge inverter output current i after LC wave filtersoa、iob、ioc, half-bridge module rectification side is straight
Flow voltage udcxi(x=a, b, c, i=1,2,3), DC bus-bar voltage udc。
As shown in Figures 2 and 3, under abc rest frames, single star-like MMC mathematical modeling is：
Wherein, ix(x=a, b, c) is single star-like MMC input current, ux(x=a, b, c) is single star-like MMC close to electricity
Net side input voltage, usx(x=a, b, c) is the input voltage after single star-like MMC electric capacity after filtering, LhIt is filter inductance,
ChIt is DC side filter capacitor, udcIt is DC voltage, ihx(x=a, b, c) is the equivalent output current of DC side, and r is three-phase list
Star-like MMC internal parallels equivalent resistance, n are the quantity of half-bridge module in every phase.
Three-phase will be obtained under the Voltage to current transducer detected under obtained abc three-phase static coordinate systems to dq rotating coordinate systems
Phase voltage ud、uq, three-phase phase current id、iqThe star-like MMC of three-phase list input current isd、isq, three-phase full-bridge inverter output current
iLd、iLq, LC filter to output current iod、ioq。
Mathematical modelings of the star-like MMC of three-phase list under abc three-phase static coordinate systems is carried out into park conversion can obtain three
Mutually mathematical modelings of single star-like MMC under dq rotating coordinate systems：
Wherein, id、iqIt is ixValue under (x=a, b, c) dq coordinate systems, ud、uqIt is uxUnder (x=a, b, c) dq coordinate systems
Value, usd、usqIt is usxThe value of (x=a, b, c) under dq coordinate systems, isd、isqIt is ihxThe value of (x=a, b, c) under dq coordinate systems.
By the mathematical modeling under dq coordinate systems of the star-like MMC inverter of three-phase list, it is steady DC bus-bar voltage can be designed
Fixed and reactive-current compensation controller.The governing equation of controller is：
Wherein, khpIt is electric current loop proportionality coefficient, khiIt is electric current loop integral coefficient.
The governing equation that the governing equation is brought into single star-like MMC mathematical modeling after being decoupled：
The star-like MMC of list governing equation can realize single star-like MMC reliable control, realize that the star-like MMC of three-phase list is defeated
Go out the stabilization of voltage, the governing equation design controller according to single star-like MMC controllers.Wherein, single star-like MMC watt current
Inverter direct-flow side DC voltage value is controlled, so using rectification side rated voltage uref dc as command value, three-phase prime rectification half
Bridge exports average voltagePI regulations are carried out for value of feedback, the result of PI regulations is as watt current command value iref d.Dan Xing
The reactive current of type MMC outputs realizes the compensation to transformer reactive power, is calculated by the reactive power Q currently exported
Come, current output reactive power Q is according to the voltage u of current transformer vice-side windingd、uqWith electric current id、iqIt is calculated.
Reactive-current compensation link includes reactive power and calculates, compensates Current calculation, compensation closed-loop current control, direct current mother
Five line voltage closed-loop control, PWM parts.Transformer secondary winding under the dq coordinate systems obtained according to measure voltage ＆ current link
Voltage ud、uqWith electric current id、iqThe reactive power Q of transmitting transformer can be calculated, according to reactive-current compensation ratio and list
The limitation of star-like MMC output currents calculates reactive-load compensation electric current, and reactive current is compensated by closed-loop current control.Pass through
The DC bus-bar voltage of the stable half-bridge module outlet side of closed-loop control, maintains three-phase inverter DC-side Voltage Stabilization.
As shown in figure 4, under abc rest frames, the mathematical modeling of three-phase full-bridge inverter is：
Wherein, umx(x=a, b, c) is the voltage of inverter output, and Δ ux (x=a, b, c) is defeated after LC wave filters
The voltage gone out, iLx(x=a, b, c) is the current value of inductance after filtering, iox(x=a, b, c) is exported after LC wave filters
Current value, LsIt is LC filter inductance values, CsIt is LC filter capacitances.
Three-phase full bridge converters are converted to obtain the rotation of dq two-phases from mathematical modeling under abc three-phase static coordinate systems by park
Turn mathematical modeling under coordinate system：
Wherein, umd、umqIt is umxThe value of (x=a, b, c) under dq coordinate systems, Δ ud、ΔuqIt is Δ ux(x=a, b, c) exists
Value under dq coordinate systems, iLd、iLqIt is iLxThe value of (x=a, b, c) under dq coordinate systems, iod、ioqIt is iox(x=a, b, c) is in dq
Value under coordinate system.
By three-phase full-bridge inverter mathematical modeling, the governing equation of controller voltage close loop and current closed-loop is established：
Wherein, ksupIt is Voltage loop proportionality coefficient, ksuiIt is Voltage loop integral coefficient, ksipIt is electric current loop proportionality coefficient.
By three phase full bridge circuit voltage closed-loop control equation and closed-loop current control equation, realize and injected into transformer
The function of positive sequence, negative phase-sequence and zero-sequence current, the offset voltage of dynamic regulation inverter realize the function of dynamic voltage compensation.
Voltage failure detection includes power network fundamental voltage lock phase, voltage vector summation, voltage ratio compared with three parts.By
Three-phase phase voltage u under the dq coordinate systems that measure voltage ＆ current link obtainsd、uqVector that can be in the hope of voltage under dq coordinate systems
And udq, comparison voltage vector udqWith rated voltage u0, voltage Δ u is compensated, when offset voltage Δ u exceedes the threshold value of setting
When, judge voltage failure occurs, output voltage is compensated.
Dynamic voltage compensation compensation tache includes tri- offset voltage calculating, park inverse transformations, PWM parts.By voltage event
Voltage vector and rated voltage vector u under the dq coordinate systems obtained in barrier detection0Contrast, is compensated voltage Δ u, passes through
Double closed-loop of voltage and current and PWM obtain the control voltage Δ u of three-phase full-bridge inverterga、Δugb、Δugc。
Its reactive-current compensation part each unit of hybrid power electronic transformer based on single star-like MMC structures is independent,
It is easy to modular horizontal extension, its dynamic voltage compensation part output voltage and the winding of the star-like connection of transformer secondary are mutually gone here and there
Connection, realize that voltage dynamic compensates.
Hybrid power electronic transformer based on single star-like MMC structures realizes big work(on the basis of traditional transmitting transformer
The reactive-current compensation and dynamic voltage compensation of rate.By controlling the power electronic equipment in mixed type transformer to optimize electricity
Net flow path, the electric energy efficiency of transmission and the quality of power supply for reducing grid power loss, improving power network, strengthen the stabilization of power transmission network
Property.By the combination of traditional transformer and single star-like MMC structures, that is, overcome traditional transformer and energy is regulated and controled to the power network quality of power supply
Hypodynamic defect, also compensate for electric power electric transformer can not realize the weakness of bulk power transmission.
Compared to existing hybrid power electronic transformer, reactive-current compensation module is using single star-like in the present invention
MMC structures, its input voltage and input current it is higher ranked, it is possible to achieve the function of high no-load voltage ratio transformer, realize that high pressure is big
The reactive-load compensation of capacity.
Claims (8)
- A kind of 1. hybrid power electronic transformer based on single star-like MMC structures, it is characterised in that：Three-phase transformer, primary side Contactor, the star-like MMC of three-phase list, common DC bus, three-phase full-bridge inverter, LC wave filters and secondary contactor；Three-phase transformer primary side winding is connected using triangle, and vice-side winding uses star-like connection；The star-like MMC of list of each phase is connected in parallel on the corresponding transformer primary side winding coil by a primary side contactor, The star-like MMC of three-phase list output-parallel is connected on common DC bus；The direct current input side of three-phase full-bridge inverter is connected on common DC bus, exchanges outlet side after LC wave filters, Connected and accessed in the star-like connection of three-phase transformer vice-side winding by secondary contactor.
- 2. the hybrid power electronic transformer according to claim 1 based on single star-like MMC structures, it is characterised in that： The star-like MMC of list of each phase is in series by some half-bridge modules, and each half-bridge module includes Half bridge rectifier circuit, DC filtering Electric capacity and DHB isolated form DC/DC converters；The input side series half-bridge rectification circuit of half-bridge module, is filtered after Half bridge rectifier circuit by DC filter capacitor Ripple, then reduced high-voltage dc voltage by DHB isolated form DC/DC converters, it is connected on common DC bus.
- 3. the hybrid power electronic transformer according to claim 1 based on single star-like MMC structures, it is characterised in that： Three-phase full-bridge inverter structure includes 6 field-effect transistors and 6 anti-parallel diodes.
- A kind of 4. control method of the hybrid power electronic transformer based on single star-like MMC structures, it is characterised in that：The control Method processed includes reactive-current compensation control and dynamic voltage compensation control；MMC star-like to three-phase list uses closed-loop current control Method carry out reactive-current compensation；Dynamic electric voltage benefit is carried out using the method for Double closed-loop of voltage and current to three-phase inverter Repay.
- 5. the hybrid power electronic transformer according to claim 4 based on single star-like MMC structures, it is characterised in that： The reactive-current compensation control calculates comprising reactive power, compensation Current calculation, compensation closed-loop current control, dc bus electricity Press closed-loop control and PWM controls；The reactive power of transmitting transformer is calculated, according to the limitation meter of reactive-current compensation ratio and single star-like MMC output currents Reactive-load compensation electric current is calculated, by closed-loop current control and DC bus-bar voltage closed-loop control, control signal is opened through PWM control Device is closed, reactive current is compensated.
- 6. the hybrid power electronic transformer according to claim 5 based on single star-like MMC structures, it is characterised in that： The reactive power calculates：The voltage x current under three-phase static coordinate system is detected, is converted to transformer secondary under dq coordinate systems Winding voltage electric current, the reactive power of transmitting transformer is calculated.
- 7. the hybrid power electronic transformer according to claim 4 based on single star-like MMC structures, it is characterised in that： The dynamic voltage compensation control calculates comprising offset voltage, Double closed-loop of voltage and current and PWM control；Offset voltage is calculated, by Double closed-loop of voltage and current and PWM controlling switch device, controls three phase full bridge inversion The voltage of device.
- 8. the hybrid power electronic transformer according to claim 7 based on single star-like MMC structures, it is characterised in that： The offset voltage calculates：The voltage x current under three-phase static coordinate system is detected, the three-phase being converted under dq coordinate systems is mutually electric Pressure, tries to achieve vector of the voltage under dq coordinate systems, comparison voltage vector and rated voltage, is compensated voltage.
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| CN108242813A (en) * | 2018-02-02 | 2018-07-03 | 山东电力设备有限公司 | The energy router and its control method of power quality harnessed synthetically and power optimization |
| CN110086355A (en) * | 2019-04-29 | 2019-08-02 | 西安交通大学 | A kind of high frequency control offset-type controllable AC distribution transformer |
| CN110829450A (en) * | 2019-10-18 | 2020-02-21 | 滕欣元 | Capacitor-free low-voltage power distribution network reactive compensation circuit and control method thereof |
| CN112290814A (en) * | 2019-07-24 | 2021-01-29 | 苏州万瑞达电气有限公司 | Three-phase PWM rectifier control method using isolation transformer for grid connection |
| CN112928929A (en) * | 2021-01-28 | 2021-06-08 | 西安交通大学 | Three-phase separated series hybrid power electronic transformer and control method thereof |
| CN114069633A (en) * | 2021-10-29 | 2022-02-18 | 东北电力大学 | Hybrid intelligent distribution transformer containing high-frequency isolated back-to-back converter |
| CN114696630A (en) * | 2022-05-31 | 2022-07-01 | 武汉大学 | Bootstrap-type compensated three-port converter and control method and system thereof |
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Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108242813A (en) * | 2018-02-02 | 2018-07-03 | 山东电力设备有限公司 | The energy router and its control method of power quality harnessed synthetically and power optimization |
| CN108242813B (en) * | 2018-02-02 | 2021-08-24 | 山东电力设备有限公司 | Control method of energy router for comprehensive treatment of electric energy quality and power optimization |
| CN110086355A (en) * | 2019-04-29 | 2019-08-02 | 西安交通大学 | A kind of high frequency control offset-type controllable AC distribution transformer |
| CN112290814A (en) * | 2019-07-24 | 2021-01-29 | 苏州万瑞达电气有限公司 | Three-phase PWM rectifier control method using isolation transformer for grid connection |
| CN112290814B (en) * | 2019-07-24 | 2024-04-26 | 苏州弗赛新能源科技有限公司 | Three-phase PWM rectifier control method using isolation transformer for grid connection |
| CN110829450A (en) * | 2019-10-18 | 2020-02-21 | 滕欣元 | Capacitor-free low-voltage power distribution network reactive compensation circuit and control method thereof |
| CN110829450B (en) * | 2019-10-18 | 2020-07-07 | 滕欣元 | Capacitor-free low-voltage power distribution network reactive compensation circuit and control method thereof |
| CN112928929A (en) * | 2021-01-28 | 2021-06-08 | 西安交通大学 | Three-phase separated series hybrid power electronic transformer and control method thereof |
| CN112928929B (en) * | 2021-01-28 | 2022-05-20 | 西安交通大学 | Three-phase separated series hybrid power electronic transformer and control method thereof |
| CN114069633A (en) * | 2021-10-29 | 2022-02-18 | 东北电力大学 | Hybrid intelligent distribution transformer containing high-frequency isolated back-to-back converter |
| CN114696630A (en) * | 2022-05-31 | 2022-07-01 | 武汉大学 | Bootstrap-type compensated three-port converter and control method and system thereof |
| CN114696630B (en) * | 2022-05-31 | 2022-08-16 | 武汉大学 | Bootstrap-type compensated three-port converter and control method and system thereof |
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Application publication date: 20180109 |