CN103401467A - Bidirectional ac power controller of ac-dc mixing mini electrical network - Google Patents
Bidirectional ac power controller of ac-dc mixing mini electrical network Download PDFInfo
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- CN103401467A CN103401467A CN201310260203XA CN201310260203A CN103401467A CN 103401467 A CN103401467 A CN 103401467A CN 201310260203X A CN201310260203X A CN 201310260203XA CN 201310260203 A CN201310260203 A CN 201310260203A CN 103401467 A CN103401467 A CN 103401467A
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Abstract
The invention relates to a bidirectional ac power controller of an ac-dc mixing mini electrical network. The controller comprises a bidirectional ac module, wherein the dc side of the bidirectional ac module is connected with a dc bus of the ac-dc mixing mini electrical network via a voltage boosting/reducing module, and the ac side of the bidirectional ac module is connected with an ac bus of the ac-dc mixing mini electrical network via a filter. The bidirectional ac power controller of the ac-dc mixing mini electrical network has the advantages that the bidirectional ac power controller is arranged between an ac node and a dc node of the ac-dc mixing mini electrical network to realize interconnection between the ac part and the dc part, the stability of the mini electric network is enhanced, and further power distribution of the mini electrical network is more balanced.
Description
Technical field
The present invention relates to a kind of Bidirectional variable-flow power controller of alternating current-direct current mixing micro power network, belong to the micro power network automation field.
Background technology
Micro power network is with the important means of distributed power source with large stabilization of power grids efficient coupling, is the optimal path that distributed energy utilizes.The development of micro power network must advance the change upgrading of traditional electrical web frame.Micro power network,, with the one way flow of energy distributed power source, two-wayly can flow distributed power source, load, and device unification to organic systems such as power control, realize efficient utilization and the Based Intelligent Control of electric energy.The close association of micro power network and power consumption terminal, can greatly improve the electric power efficiency, improves customer experience.
Micro power network generally can be divided into three kinds by form of power: exchange micro power network, DC micro electrical network, and the alternating current-direct current hybrid micro power network.Single form of power micro power network respectively has pluses and minuses: exchange the easier and large electrical network of micro power network and mutually mate; The DC micro electrical network can reduce system cost, effectively suppresses the circulation between each distributed power source.And consider the characteristics of distributed power source, the power demands of load and the application expection of micro-grid system the best, the research of alternating current-direct current mixing micro power network becomes the field of forefront in the electrical network intelligent construction.At present, mostly domestic micro power network construction is exploratory project, and most research based on computer simulation, and the application of the engineering of alternating current-direct current mixing micro power network is in the blank stage especially.Nucleus equipment in alternating current-direct current mixing micro power network is exactly the Bidirectional variable-flow power controller.In the alternating current-direct current hybrid micro power network, the voltage range of dc bus is between 200V to 400V.The Bidirectional variable-flow power control apparatus is in the DC-AC Nodes of alternating current-direct current mixing micro power network, as 240V dc bus in micro power network and coupling device of 400V ac bus, the Bidirectional variable-flow, power adjustments, power distribution, DC side voltage stabilizing, the AC electric voltage frequency that are used between alternating current-direct current mixing micro power network dc bus and ac bus are controlled.
The system protection of micro power network and control strategy are to control the protection integral structure in theory, and this just requires its crucial power electronic equipment can meet micro power network under energy flow path complicated situation, still can meet system and control and the requirement of protecting.
Summary of the invention
The Bidirectional variable-flow power controller that the purpose of this invention is to provide a kind of alternating current-direct current mixing micro power network, in order to the power that solves alternating current-direct current mixing micro power network AC portion and direct current component can't two-way flow problem.
For achieving the above object, the solution of the present invention is: a kind of Bidirectional variable-flow power controller of alternating current-direct current mixing micro power network, comprise a Bidirectional variable-flow module, the DC side of Bidirectional variable-flow module connects the dc bus of alternating current-direct current mixing micro power network by the buck module, the AC of Bidirectional variable-flow module connects the ac bus of alternating current-direct current mixing micro power network by filter.
Described Bidirectional variable-flow module is three Level Full Bridge Bidirectional variable-flow modules.
Described filter is the LCL filter.
Described buck module is two-way DC/DC module.
The invention has the beneficial effects as follows: by configuration Bidirectional variable-flow power controller of the present invention between the interchange node at alternating current-direct current mixing micro power network and direct current node, realized the interconnected of AC portion and direct current component, strengthened the stability of micro power network, the power division that makes micro power network is balance more.
Description of drawings
Fig. 1 is a kind of Bidirectional variable-flow power controller hardware configuration of the present invention;
Fig. 2 is the equivalent model of three phase full bridge convertor circuit;
Fig. 3 is three phase full bridge convertor circuit polar plot;
Fig. 4 is a kind of circuit topological structure of realizing that the direct current Bidirectional up-down is pressed of the present invention;
Fig. 5 is a kind of three level bridge circuit topological structures of realizing Bidirectional variable-flow of the present invention;
Fig. 6 is modularity Bidirectional variable-flow structure of the present invention;
Fig. 7 is the control circuit of Bidirectional variable-flow power conversion of the present invention.
Embodiment
The present invention will be further described in detail below in conjunction with accompanying drawing.
A kind of Bidirectional variable-flow power controller hardware configuration that is applicable to alternating current-direct current mixing micro power network as shown in Figure 1, equipment is positioned at the DC-AC Nodes of alternating current-direct current mixing micro power network, and the Bidirectional variable-flow, power adjustments, power distribution, DC side voltage stabilizing, the AC electric voltage frequency that are used between dc bus and ac bus are controlled.
The present invention has designed a kind of circuit topological structure of realizing that the direct current Bidirectional up-down is pressed, the boost function while being used for completing dc bus to the AC transmission power and the AC buck functionality during to the dc bus transmission power.As shown in Figure 4, two divergence type IGBT and DC side inductance form T-shaped structure to bidirectional, dc buck topological structure.Dc bus capacitor is the energy storage filter capacitor, is used for keeping the input direct-current busbar voltage stable, has simultaneously filter function.The DC side inductance is mainly used in the periodicity storage of electric energy and discharges, and keeps the continous-stable of direct current.The capacity of divergence type IGBT and operating frequency have determined the size of rated power capacity and dc ripple coefficient.
The present invention has designed a kind of three Level Full Bridge Bidirectional variable-flow modules that realize Bidirectional variable-flow, and as shown in Figure 5, Fig. 5 left side is used for realizing interconnection and the bi-directional power conversion of DC side and AC.Topology realizes by the power electronics modules that employing is integrated with 12 IGBT, and integrated component inside is contained grid and driven control, fault detect and protective circuit.System requirements is realized the three phase full bridge unsteady flow, and the dc voltage requirement is
Keep 2-3 allowance doubly, selecting DC break down voltage is the module of 1200V, and the design transfer power is 10kW.In addition, the LCL filter that Fig. 5 right side is designed for the present invention,, by parameter designing, mate LCL filter and three level bridge circuits fully, and the high order harmonic component of filtering equipment output, guarantee pure sinewave output.
Figure 6 shows that Bidirectional variable-flow power controller multi-wad join schematic diagram of the present invention, the unit that the minimum modularity unit of the Bidirectional variable-flow power controller of the present invention's design is a 10kW, circuit and Bidirectional variable-flow three level bridge circuits that this unit is pressed by a direct current Bidirectional up-down form.It is large that power capacity when between dc bus and ac bus becomes, and can reach desired volume by the mode of a plurality of unit parallel connection.The advantage of design is like this: between bus, power can change in the larger context.The Bidirectional variable-flow power controller can be controlled by the coordination to each unit, improves the utilization ratio of power electronic element, reduces the average operation time of element, extends lifetime of system.
The present invention has designed a kind of control circuit for the Bidirectional variable-flow power conversion.Control circuit designs centered by microcontroller, be the control core of whole system, output pwm pulse signal, processing AC/DC sampling signal, control relay switch and communication, and particular hardware connects as shown in Figure 7.
Minimum modularity unit take power as 10kW, as example, illustrates a kind of hardware designs of Bidirectional variable-flow power controller.This equipment is positioned at the DC-AC Nodes of alternating current-direct current mixing micro power network,, as 240V dc bus in micro power network and coupling device of 400V ac bus, complete the functions such as Bidirectional variable-flow, power adjustments, power distribution, DC side voltage stabilizing, the control of AC electric voltage frequency.The Bidirectional variable-flow power controller consists of power electronics main circuit, control circuit, power circuit and drive circuit four parts.Boost function when bidirectional, dc buck topological structure is used for completing from dc bus to the AC transmission power and the AC buck functionality during to the dc bus transmission power, this topology mainly realizes by two complete controlled divergence type IGBT.Main circuit unsteady flow part realizes by three level bridge-type two-way power topologys, and this topology adopts the power electronics modules that is integrated with 12 IGBT to realize.The design of LCL filter and three level bridge circuits mate fully, and the high order harmonic component of filtering equipment output, guarantee pure sinewave output.Control circuit is the core of whole system, output pwm pulse signal, processing AC/DC sampling signal, control relay switch and communication.Situation according to micro power network: DC bus-bar voltage is 240V, and ac bus voltage is 400V.Parameter designing to the said equipment is as follows: the DC side electric capacity of voltage regulation is many Capacitance parallel connections type, ripple inductance size is selected 20～30mH, the operating switch frequency of two divergence type IGBT is 30～40kHz, 400V electric capacity of voltage regulation total amount is 7000～8000uF, and in three Level Full Bridge circuit, the maximum operating frequency of IGBT is 10kHz.
Can realize inversion and rectification function by the Bidirectional variable-flow power controller that the present invention proposes, concrete principle analysis is as follows:
In the Bidirectional variable-flow power controller, the realization of DC-AC Bidirectional variable-flow relies on Power Electronic Circuit.Its topological structure is a three phase full bridge circuit that comprises the LCL filter design.During to the ac bus through-put power, the three phase full bridge circuit working is at inverter mode when dc bus; And when ac bus during to the dc bus through-put power, the three phase full bridge circuit working is at rectification state.Suppose that the AC input voltage is v, electric current is i, and the DC side input voltage is v
dc, electric current is i
dc, in addition according to electrical network character, the AC electrical network is inductive impedance, the DC side electrical network is resistive impedance, so, the equivalent model of three phase full bridge convertor circuit namely as shown in Figure 2:
Can obtain formula v=e-v according to the voltage relationship of AC
L, therefore can know, can realize the four quadrant running of three phase full bridge circuit by controlling alternating voltage vector v.As shown in Figure 3, the end points movement locus of ac-side current vector i has formed a circle take i as radius.
When current i operated in first, fourth quadrant, power stream pointed to DC side by AC, and the power electronics main circuit is realized rectification function; When current i operated in second and third quadrant, power stream pointed to AC by DC side, and the power electronics main circuit is realized invert function.
Claims (4)
1. the Bidirectional variable-flow power controller of an alternating current-direct current mixing micro power network, it is characterized in that, comprise a Bidirectional variable-flow module, the DC side of Bidirectional variable-flow module connects the dc bus of alternating current-direct current mixing micro power network by the buck module, the AC of Bidirectional variable-flow module connects the ac bus of alternating current-direct current mixing micro power network by filter.
2. the Bidirectional variable-flow power controller of a kind of alternating current-direct current mixing micro power network according to claim 1, is characterized in that, described Bidirectional variable-flow module is three Level Full Bridge Bidirectional variable-flow modules.
3. the Bidirectional variable-flow power controller of a kind of alternating current-direct current mixing micro power network according to claim 1, is characterized in that, described filter is the LCL filter.
4. the Bidirectional variable-flow power controller of a kind of alternating current-direct current mixing micro power network according to claim 1, is characterized in that, described buck module is two-way DC/DC module.
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| CN201310260203XA CN103401467A (en) | 2013-06-26 | 2013-06-26 | Bidirectional ac power controller of ac-dc mixing mini electrical network |
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| CN201310260203XA CN103401467A (en) | 2013-06-26 | 2013-06-26 | Bidirectional ac power controller of ac-dc mixing mini electrical network |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US11509239B2 (en) | 2020-05-26 | 2022-11-22 | Delta Electronics (Shanghai) Co., Ltd | Conversion device having reduced size and cost |
| US11515806B2 (en) | 2020-05-26 | 2022-11-29 | Delta Electronics (Shanghai) Co., Ltd | Conversion device having reduced common-mode current |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8164217B1 (en) * | 2010-04-15 | 2012-04-24 | Science Applications International Corporation | System and method for management of a DC and AC bus microgrid |
| CN203071836U (en) * | 2013-01-22 | 2013-07-17 | 湖南天佳电子技术有限公司 | Mixed microgrid system and AC/DC coupler thereof |
-
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- 2013-06-26 CN CN201310260203XA patent/CN103401467A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8164217B1 (en) * | 2010-04-15 | 2012-04-24 | Science Applications International Corporation | System and method for management of a DC and AC bus microgrid |
| CN203071836U (en) * | 2013-01-22 | 2013-07-17 | 湖南天佳电子技术有限公司 | Mixed microgrid system and AC/DC coupler thereof |
Non-Patent Citations (1)
| Title |
|---|
| POH CHIANG LOH，ETC.: ""Autonomous Control of Interlinking Converters in Hybrid AC-DC Microgrids with Energy Storages"", 《ENERGY CONVERSION CONGRESS AND EXPOSITION（ECCE），2011 IEEE》 * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US11509239B2 (en) | 2020-05-26 | 2022-11-22 | Delta Electronics (Shanghai) Co., Ltd | Conversion device having reduced size and cost |
| US11515806B2 (en) | 2020-05-26 | 2022-11-29 | Delta Electronics (Shanghai) Co., Ltd | Conversion device having reduced common-mode current |
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