CN104993713A - Control method for double PWM solid-state transformer - Google Patents
Control method for double PWM solid-state transformer Download PDFInfo
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- CN104993713A CN104993713A CN201510433713.1A CN201510433713A CN104993713A CN 104993713 A CN104993713 A CN 104993713A CN 201510433713 A CN201510433713 A CN 201510433713A CN 104993713 A CN104993713 A CN 104993713A
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Abstract
The invention discloses a control method for a double PWM solid-state transformer. The control method is implemented based on a double PWM solid-state transformer structure. For rectifier control, a double closed-loop control mode (direct-current voltage at outer loop and grid-side current at inner loop) is adopted under a dq synchronous rotating coordinate system to realize sinusoidal control on the grid-side current and make the unit power factor be 1; for direct-current transformation control, a double closed-loop control mode (output voltage at outer loop and inductive current at inner loop) is adopted to realize voltage level transformation, power transmission and electrical isolation; and for inverter control, a double closed-loop control mode (output voltage at outer loop and inductive current at inner loop) is adopted under the dq synchronous rotating coordinate system. Reliable high-quality power can be provided for users, and the bad influence of nonlinear load on the power grid can be improved effectively. The control method has higher load adaptability and dynamic response.
Description
Technical field
The present invention relates to the application of power electronic technology in electric power system, especially a kind of control method of the two PWM solid-state transformers for power electronics.
Background technology
Solid-state transformer, also known as making electric power electric transformer, is a kind of modern power electronics technology and transformer technology are applied the novel electric equipment combined.Except can realizing the electrical isolation of traditional transformer, the basic function such as Energy Transfer and voltage transformation, its outstanding feature has high controllability, can control flexibly transformer both sides voltage magnitude and phase place, effectively improve the electrical network quality of power supply, and volume is little, lightweight, low in the pollution of the environment.Along with the development of solid-state transformer technology, its application in electric power system will constantly be promoted, and effectively promote the construction of intelligent grid.
But current domestic and international existing solid-state transformer topological structure disunity, device for power switching is more, and switching loss is higher, and corresponding control algolithm relative complex, shows particularly evident especially in input element commutation phase and DC converting link.
If publication number is propose in the patent " a kind of novel electric power electric transformer " of CN101707443A to adopt multiple MMC as input rectifying level, although higher direct voltage can be obtained to a certain extent, but have also been introduced voltage balancing control problem, and intermediate dc transform part lacks auxiliary induction, reduce the flexibility that intergrade controls.
Publication number is that the power inverter cascade that patent " a kind of voltage reducing power electronic transformer for power distribution network " its rectification stage of CN102055348A is made up of uncontrollable rectifier bridge and boost circuit of power factor correction forms, topological structure is complicated, and intergrade adopts uncontrollable rectifier bridge construction, the two-way flow of energy can not be carried out, solar energy, the wind energy distributed energy cannot be realized to the power back off of electrical network.
Publication number is that patent " a kind of electric power electric transformer for power distribution network and control method thereof " its rectification stage of CN102223078A controls relatively easily, but there is the balance control problem of neutral point, and tri-level half-bridge in intermediate conversion level and uncontrollable rectifier bridge construction, its controllability is reduced, and not there is power bi-directional transmittability.
Summary of the invention
For solid-state transformer complex structure in above-mentioned prior art, the problem that control effects is undesirable, the invention provides a kind of topological structure simple, control two PWM solid-state transformer and control method thereof flexibly.
For realizing above target, realized by following scheme:
A control method for pair PWM solid-state transformer, control method described in it is based on a kind of two PWM solid-state transformer structure, realizes the control method of its pair of PWM solid-state transformer;
Described pair of PWM solid-state transformer structure is comprised rectification stage circuit and is connected with DC converting level circuit input end by electric capacity, and DC converting level circuit output end connects inverse cascade circuit through electric capacity;
Described rectification stage circuit is two level voltage type PWM rectifier, and its device for power switching is all full-controlled switch devices;
Described DC converting level circuit is made up of two high-frequency converters and high frequency transformer; Its high-frequency converter is single-phase full bridge converter, and its device for power switching is full-controlled switch device; Its high frequency transformer is that non-crystaline amorphous metal magnetically soft alloy material is made;
Described inverse cascade circuit is two level voltage type PWM inverter, and its device for power switching is full-controlled switch device;
The control method of described pair of PWM solid-state transformer is undertaken by following controlling unit:
Step one, rectification stage control to adopt under dq synchronous rotating frame, and the double circle controling mode of direct voltage ring network side current inner loop, specifically comprises the following steps:
(1) gather net side three-phase voltage, obtain voltage on line side phase place by single synchronous coordinate system software phase-lock loop;
(2) gather the DC voltage of rectification stage circuit, and compare with target is given, its error regulates through outer voltage PI controller, and what export as current inner loop d axle is given; Outer voltage is for realizing the stability contorting to output voltage;
(3) sample to current on line side, obtain the component of electric current at d axle and q axle through dq conversion, wherein d axle is real component, and q axle is idle component; To net side d shaft current component to compare with target is given, its error sends into d shaft current inner ring PI controller; Q shaft current and desired value 0 poor, its error is sent into q shaft current inner ring PI controller; Carry out decoupling zero and dq inverse transformation to dq shaft current ring, obtain target modulation ripple, through SPWM module, obtain pwm control signal, the unity power factor realizing rectification stage circuit runs.
Step 2, DC converting level control to adopt output voltage outer ring inductive current inner ring two close cycles mode, specifically comprise the following steps:
(1) gather DC converting level single-phase full bridge rectifier DC outlet side voltage, poor with desired value, regulate through voltage PI controller, it exports the desired value as current inner loop;
(2) gather DC converting level single-phase full-bridge inverter and exchange input side electric current, poor with desired value, regulate through current PI controller, it exports and obtains pwm control signal with triangle wave, realizes the stability contorting of DC converting level.
Step 3, inverse cascade control to adopt under dq synchronous rotating frame, and the double circle controling mode of output voltage outer ring inductive current inner ring, specifically comprises the following steps:
(1) gather threephase load voltage, obtain the component of voltage of d axle and q axle through dq conversion; Two shaft voltages are poor with desired value respectively, and regulate through pi regulator, its output is given as the target of current inner loop;
(2) gather three pole reactor electric current, obtain the current component of d axle and q axle through dq conversion; Diaxon current component is poor with desired value respectively, and its error is sent into pi regulator and regulated; Again through decoupling zero and dq inverse transformation, obtain target modulation ripple, through SPWM module, obtain pwm control signal, realize stable voltage and export.
Wherein, full-controlled switch device is IGBT or IGCT be made up of SiC material.
In the technical scheme stated on the invention, the control method feature of described solid-state transformer is: the simple power device of this solid-state transformer topological structure is relatively less, and cost is lower; The control algolithm corresponded simply is easy to realize.Rectification stage circuit can realize the sine control of current on line side and unity power factor is 1; DC/DC DC converting level achieves electric pressure conversion, electrical energy transfer, electrical isolation, and provide DC bus interface, meet user to while direct current energy demand, for photovoltaic generation, wind power generation, small power station distributed grid-connected power generation system can provide direct current and network interface, realize the feedback of energy to electrical network, and there is good autgmentability; Adopt the high frequency transformer of non-crystaline amorphous metal soft magnetic material, magnetic flux density is high, and loss is little, has good temperature characterisitic, also eliminates pollution while reducing the volume and weight of transformer; Inverse cascade circuit can provide reliable high-quality electric energy for user, effectively can improve the harmful effect of nonlinear load to electrical network, have stronger workload-adaptability, and load variations be had to the dynamic response be exceedingly fast.Meanwhile, strengthen the adaptability to changes to the problem such as voltage jump, harmonic wave, harmful effect mutual when eliminating primary side and secondary side fault; Adopt high frequency transformer, power density has expanded the functional characteristic of transformer while increasing.
Accompanying drawing explanation
Fig. 1 is rectification stage circuit control principle figure of the present invention.
Fig. 2 is DC converting level circuit control principle figure of the present invention.
Fig. 3 is inverse cascade circuit control principle figure of the present invention.
Fig. 4 is solid-state transformer structural representation of the present invention.
Embodiment
Below in conjunction with accompanying drawing, concrete technical scheme of the present invention is described in further detail.
Implement the control method of a kind of pair of PWM solid-state transformer, this control method is based on a kind of two PWM solid-state transformer structure, realizes the control method of its pair of PWM solid-state transformer.Wherein:
The control method of a kind of pair of PWM solid-state transformer realizes by following controlling unit:
Step one, rectification stage control to adopt under dq synchronous rotating frame, and the double circle controling mode of direct voltage ring network side current inner loop, as shown in Figure 1, specifically comprises the following steps:
(1) rectification stage circuit voltage on line side e is gathered
a, e
b, e
c, obtain voltage on line side phase theta by single synchronous coordinate system software phase-lock loop;
(2) the DC voltage v of rectification stage circuit is gathered
dc, and given with target
compare, its error regulates through outer voltage PI controller, and what export as current inner loop d axle is given
outer voltage is for realizing the control to output voltage;
(3) to current on line side i
a, i
b, i
csample, obtain the component of electric current at d axle and q axle through dq conversion, wherein d axle is real component, and q axle is idle component; By actual d shaft current component i
dgiven with target
relatively, its error sends into d shaft current inner ring PI controller; Q shaft current i
qpoor with desired value 0, its error is sent into q shaft current inner ring PI controller; Decoupling zero and dq inverse transformation are carried out to dq shaft current ring, obtains target modulation ripple, through SPWM module, obtain pwm control signal.
Step 2, DC converting level control to adopt output voltage outer ring inductive current inner ring two close cycles mode, as shown in Figure 2, specifically comprise the following steps:
(1) DC converting level single-phase full bridge rectifier DC outlet side voltage v is gathered
o, with desired value
differ from, regulate through voltage PI controller, it exports the desired value as current inner loop
(2) gather DC converting level single-phase full-bridge inverter and exchange input side current i
l, poor with desired value, regulate through current PI controller, it exports and obtains pwm control signal with triangle wave, realizes the stability contorting of DC converting level.
Step 3, inverse cascade control to adopt under dq synchronous rotating frame, and the double circle controling mode of output voltage outer ring inductive current inner ring, as shown in Figure 3, specifically comprises the following steps:
(1) threephase load voltage u is gathered
a, u
b, u
c, the component of voltage u of d axle and q axle is obtained through dq conversion
d, u
q; Two shaft voltages respectively with desired value
differ from, regulate and voltage loop decoupling zero through pi regulator, its output is given as the target of current inner loop;
(2) three pole reactor current i is gathered
la, i
lb, i
lc, the current component i of d axle and q axle is obtained through dq conversion
ld,
diaxon current component respectively with desired value
differ from, its error is sent into pi regulator and is regulated; Again through decoupling zero and dq inverse transformation, obtain target modulation ripple, through SPWM module, obtain pwm control signal, realize stable voltage and export.
Described two PWM solid-state transformer structures as shown in Figure 4.Wherein rectification stage circuit, adopts two level voltage type PWM rectifier, comprise six device for power switching, and its device for power switching is full-controlled switch device; By filter inductance L
fbe connected with electrical network, its DC side connects corresponding high-voltage capacitance C1, and in order to cushioning energy between AC and load, to maintain DC voltage constant and suppress DC side harmonics voltage; DC/DC DC converting level circuit comprises single-phase full bridge high-frequency inverter, high frequency transformer and single-phase full bridge hf rectifier: single-phase full bridge high-frequency inverter DC side is connected with rectification stage circuit direct side by high-voltage capacitance C1, and AC passes through inductance L
dbe connected with high frequency transformer primary side, realize the conversion of direct current to high-frequency square-wave signal; High frequency transformer adopts the design of non-crystaline amorphous metal magnetically soft alloy material, for the electric pressure conversion between high/low pressure, electrical isolation and energy transferring; High frequency transformer secondary side is connected with single-phase full bridge hf rectifier AC; Single-phase full bridge rectifier and single-phase full-bridge inverter, all containing four device for power switching, its device for power switching is full-controlled switch device; Inverse cascade circuit adopts two level voltage type PWM inverter, comprise six device for power switching, and its device for power switching is full-controlled switch device, be connected with DC/DC DC converting level single-phase full bridge hf rectifier DC output side by low-voltage capacitance C2, the LC filter that its AC is connected by Y type is connected with load.
Claims (2)
1. a control method for two PWM solid-state transformer, control method described in it is based on a kind of two PWM solid-state transformer structure, realizes the control method of its pair of PWM solid-state transformer;
Described pair of PWM solid-state transformer structure is comprised rectification stage circuit and is connected with DC converting level circuit input end by electric capacity, and DC converting level circuit output end connects inverse cascade circuit through electric capacity;
Described rectification stage circuit is two level voltage type PWM rectifier, and its device for power switching is all full-controlled switch devices;
Described DC converting level circuit is made up of two high-frequency converters and high frequency transformer; Its high-frequency converter is single-phase full bridge converter, and its device for power switching is full-controlled switch device; Its high frequency transformer is that the magnetically soft alloy material of non-crystaline amorphous metal is made;
Described inverse cascade circuit is two level voltage type PWM inverter, and its device for power switching is full-controlled switch device;
The control method of described pair of PWM solid-state transformer is undertaken by following controlling unit:
Step one, rectification stage control to adopt under dq synchronous rotating frame, and the double circle controling mode of direct voltage ring network side current inner loop, specifically comprises the following steps:
(1) gather net side three-phase voltage, obtain voltage on line side phase place by single synchronous coordinate system software phase-lock loop;
(2) gather the DC voltage of rectification stage circuit, and compare with target is given, its error regulates through outer voltage PI controller, and what export as current inner loop d axle is given; Outer voltage is for realizing the stability contorting to output voltage;
(3) sample to current on line side, obtain the component of electric current at d axle and q axle through dq conversion, wherein d axle is real component, and q axle is idle component; To net side d shaft current component to compare with target is given, its error sends into d shaft current inner ring PI controller; Q shaft current and desired value 0 poor, its error is sent into q shaft current inner ring PI controller; Carry out decoupling zero and dq inverse transformation to dq shaft current ring, obtain target modulation ripple, through SPWM module, obtain pwm control signal, the unity power factor realizing rectification stage circuit runs.
Step 2, DC converting level control to adopt output voltage outer ring inductive current inner ring two close cycles mode, specifically comprise the following steps:
(1) gather DC converting level single-phase full bridge rectifier DC outlet side voltage, poor with desired value, regulate through voltage PI controller, it exports the desired value as current inner loop;
(2) gather DC converting level single-phase full-bridge inverter and exchange input side electric current, poor with desired value, regulate through current PI controller, it exports and obtains pwm control signal with triangle wave, realizes the stability contorting of DC converting level.
Step 3, inverse cascade control to adopt under dq synchronous rotating frame, and the double circle controling mode of output voltage outer ring inductive current inner ring, specifically comprises the following steps:
(1) gather threephase load voltage, obtain the component of voltage of d axle and q axle through dq conversion; Two shaft voltages are poor with desired value respectively, and regulate through pi regulator, its output is given as the target of current inner loop;
(2) gather three pole reactor electric current, obtain the current component of d axle and q axle through dq conversion; Diaxon current component is poor with desired value respectively, and its error is sent into pi regulator and regulated; Again through decoupling zero and dq inverse transformation, obtain target modulation ripple, through SPWM module, obtain pwm control signal, realize stable voltage and export.
2. the control method of two PWM solid-state transformer as claimed in claim 1, described full-controlled switch device is the IGBT be made up of SiC material.
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| CN106921157A (en) * | 2015-12-28 | 2017-07-04 | 国网智能电网研究院 | A kind of AC singlephase earth fault control method of flexible ring net controller |
| CN108233381A (en) * | 2016-12-15 | 2018-06-29 | 中国农业大学 | A kind of solid-state transformer, control method and device |
| CN108365626A (en) * | 2018-02-28 | 2018-08-03 | 江苏建筑职业技术学院 | A kind of intelligent residential district power supply system based on solid-state transformer |
| CN109039117A (en) * | 2018-08-15 | 2018-12-18 | 西北工业大学 | High power density aircraft AC electrical converter and its input side low-order harmonic suppressing method |
| CN109725267A (en) * | 2017-10-31 | 2019-05-07 | 南方电网科学研究院有限责任公司 | A kind of the test circuit and its test method of solid-state transformer |
| CN110611366A (en) * | 2019-05-28 | 2019-12-24 | 杭州之江开关股份有限公司 | Zero-interruption hybrid dual-power automatic conversion device and using method thereof |
| CN110829844A (en) * | 2019-09-27 | 2020-02-21 | 西安交通大学 | Modular low-voltage alternating current-direct current hybrid power electronic transformer topology and control method thereof |
| CN112332690A (en) * | 2019-07-31 | 2021-02-05 | 中车株洲电力机车研究所有限公司 | DC-AC converter module |
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106921157A (en) * | 2015-12-28 | 2017-07-04 | 国网智能电网研究院 | A kind of AC singlephase earth fault control method of flexible ring net controller |
| CN108233381A (en) * | 2016-12-15 | 2018-06-29 | 中国农业大学 | A kind of solid-state transformer, control method and device |
| CN109725267A (en) * | 2017-10-31 | 2019-05-07 | 南方电网科学研究院有限责任公司 | A kind of the test circuit and its test method of solid-state transformer |
| CN108365626A (en) * | 2018-02-28 | 2018-08-03 | 江苏建筑职业技术学院 | A kind of intelligent residential district power supply system based on solid-state transformer |
| CN109039117A (en) * | 2018-08-15 | 2018-12-18 | 西北工业大学 | High power density aircraft AC electrical converter and its input side low-order harmonic suppressing method |
| CN109039117B (en) * | 2018-08-15 | 2020-09-25 | 西北工业大学 | High-power-density airplane alternating current converter and input side low-order harmonic suppression method thereof |
| CN110611366A (en) * | 2019-05-28 | 2019-12-24 | 杭州之江开关股份有限公司 | Zero-interruption hybrid dual-power automatic conversion device and using method thereof |
| CN112332690A (en) * | 2019-07-31 | 2021-02-05 | 中车株洲电力机车研究所有限公司 | DC-AC converter module |
| CN110829844A (en) * | 2019-09-27 | 2020-02-21 | 西安交通大学 | Modular low-voltage alternating current-direct current hybrid power electronic transformer topology and control method thereof |
| CN110829844B (en) * | 2019-09-27 | 2021-01-19 | 西安交通大学 | Modular low-voltage alternating current-direct current hybrid power electronic transformer topology and control method thereof |
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