CN103138291A - Wind power generation intelligent single-phase grid-connection controller - Google Patents

Wind power generation intelligent single-phase grid-connection controller Download PDF

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Publication number
CN103138291A
CN103138291A CN2013100712887A CN201310071288A CN103138291A CN 103138291 A CN103138291 A CN 103138291A CN 2013100712887 A CN2013100712887 A CN 2013100712887A CN 201310071288 A CN201310071288 A CN 201310071288A CN 103138291 A CN103138291 A CN 103138291A
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signal input
circuit
direct current
signal output
output
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CN2013100712887A
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杨勇
邱凯
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杨勇
邱凯
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Priority to CN2013100712887A priority Critical patent/CN103138291A/en
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    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02EREDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E10/00Energy generation through renewable energy sources
    • Y02E10/70Wind energy
    • Y02E10/76Power conversion electric or electronic aspects

Abstract

The invention provides a wind power generation intelligent single-phase grid-connection controller. A signal output end of a corresponding three-phase rectifier unit is connected with a signal input end terminal of a direct current input switch, a direct current signal output end of the direct current input switch is connected with a direct current signal input end of a direct current step-up circuit, and the direct current signal output end of the direct current step-up circuit is connected with a direct current signal input end of an inverter circuit; a signal output end of the inverter circuit is connected with the signal input end of a filter unit, a filtering signal output end of the filter unit is connected with a filtering signal input end of a grid-connection switch, and a signal output end of the grid-connection switch is connected with a signal input end of an electric energy bidirectional metering unit; the measuring signal input end of the electric energy bidirectional measuring unit is connected with a measuring signal input/output end of a main control unit, a driving signal output end of the main control unit is connected with a driving signal input end of a drive circuit, and a sampling signal output end of a sampling circuit is connected with a sampling signal input end of the main control unit.

Description

A kind of wind power generation Intelligent single-phase net-connected controller
Technical field
The present invention relates to a kind of wind power generation Intelligent single-phase net-connected controller, belong to the distributed generation technology field.
Background technology
Along with in world wide to the attention of environmental protection, Global Greenhouse Effect; each state all competitively development comprise wind energy regenerative resource utilize technology; with wind energy as a kind of selection in the energy policy of sustainable development, though to the large-scale wind driven generator of grid type and be applicable to agriculture and animal husbandry family, outlying district all given very large policy support from net type small-sized wind power generator.
In recent years, the small distributed wind power generation has obtained development fast, because directly with the wind energy input electrical network that transforms, exempt the configuration storage battery, saved the process of batteries to store energy and release, can take full advantage of the electric power that sends, reduce energy loss, reduce system cost.Wind power grid-connected generating system can walk abreast and use civil power and regenerative resource as the power supply of local AC load, reduces the load short of electricity rate of whole system.Simultaneously, wind power-generating grid-connected system can play Peak Load Adjustment to utility network.Far below solar photovoltaic generation system, therefore its practicality strengthens greatly, grid-connected system is solar energy due to the wind power-generating grid-connected system cost, and the developing direction of wind power generation has represented the most attractive energy utilization technology of 21 century.
The installation site that has or not isolating transformer and isolating transformer according to grid-connected inverting system, combining inverter can be divided into following several:
1, Industrial Frequency Transformer isolated grid-connected system
The power frequency isolated form is the combining inverter type that occurs the earliest, and at first it by the DC/AC conversion, be converted into alternating current with the direct current after the wind-driven generator rectification, then is connected with electrical network by Industrial Frequency Transformer.Adding of Industrial Frequency Transformer makes blower fan side and electrical network electrical isolation, guarantees personal safety.In addition, also make DC side can adopt lower direct voltage, can suppress to be input to simultaneously the direct current in electrical network.
Its shortcoming is that Industrial Frequency Transformer has increased volume, weight and the cost of system, has reduced the efficient of system.
2, high frequency transformer isolated grid-connected system
At first the direct current lifting/voltage reducing after with the wind-driven generator rectification is converted to and satisfies the direct current that is incorporated into the power networks and requires the isolated grid-connected inverter of high frequency transformer by the DC/DC converter, is connected to the grid after then being converted into alternating current by inverter bridge.Compare with the power frequency isolated form, realized equally the electrical isolation of blower fan side and electrical network, and can significantly reduce volume, weight and the cost of transformer.
But this system exists the high frequency conversion link complicated, the problem that system effectiveness is low.
Summary of the invention
The problem that exists for solving above-mentioned prior art the invention provides a kind of wind power generation Intelligent single-phase net-connected controller.For this reason, the invention provides following technical scheme:
a kind of wind power generation Intelligent single-phase net-connected controller comprises three phase rectifier unit, direct current input switch, DC voltage booster circuit, inverter circuit, filter unit, the switch that is incorporated into the power networks, electric energy bidirectional measuring unit, drive circuit, main control unit and sample circuit, the signal output part of three phase rectifier unit is connected with the signal input part of direct current input switch, the DC signal output end of direct current input switch is connected with the direct current signal input of DC voltage booster circuit, the DC signal output end of DC voltage booster circuit is connected with the direct current signal input of inverter circuit, the signal output part of inverter circuit is connected with the signal input part of filter unit, the filtering signal output of filter unit is connected with the filtering signal input of the switch that is incorporated into the power networks, the signal output part of switch of being incorporated into the power networks is connected with the signal input part of electric energy bidirectional measuring unit, the metering signal input/output terminal of electric energy bidirectional measuring unit is connected with the metering signal input/output terminal of main control unit, the driving signal output part of main control unit is connected with the driving signal input of drive circuit, the driving signal output part of drive circuit and direct current input switch, DC voltage booster circuit, the driving signal input of inverter circuit and the switch that is connected connects, the sampled signal output of sample circuit is connected with the sampled signal input of main control unit.
In existing isolation type grid-connected inverter, the magnetic energy conversion of transformer can cause energy loss.The invention belongs to non-shielding system, owing to not using heavy Industrial Frequency Transformer or complicated high frequency transformer, so have the advantages that system configuration is simple, lightweight, cost is low and efficient is high.For non-isolated inverter, adopt corresponding measure and control method, can guarantee equally the circuit Operation safety and the injection of the direct current that suppresses to be incorporated into the power networks.
Description of drawings
In order to be illustrated more clearly in the technical scheme of the embodiment of the present invention, during the below will describe embodiment, the accompanying drawing of required use is done to introduce simply, apparently, accompanying drawing in the following describes is only some embodiments of the present invention, for those of ordinary skills, under the prerequisite of not paying creative work, can also obtain according to these accompanying drawings other accompanying drawing.
Fig. 1 is the structural representation of the wind power generation Intelligent single-phase net-connected controller that provides of the specific embodiment of the present invention;
Fig. 2 is the main circuit topological structure schematic diagram of the wind power generation Intelligent single-phase net-connected controller that provides of the specific embodiment of the present invention.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is clearly and completely described, obviously, described embodiment is only the present invention's part embodiment, rather than whole embodiment.Based on the embodiment in the present invention, those of ordinary skills belong to the scope of protection of the invention not making the every other embodiment that obtains under the creative work prerequisite.
this embodiment provides a kind of wind power generation Intelligent single-phase net-connected controller, as depicted in figs. 1 and 2, comprise three phase rectifier unit 1, direct current input switch 2, DC voltage booster circuit 3, inverter circuit 4, filter unit 5, the switch 6 that is incorporated into the power networks, electric energy bidirectional measuring unit 7, drive circuit 8, main control unit 10, sample circuit 11, human-computer interaction device 12 and communication interface 13, the signal output part of three phase rectifier unit 1 is connected with the signal input part of direct current input switch 2, the DC signal output end of direct current input switch 2 is connected with the direct current signal input of DC voltage booster circuit 3, the DC signal output end of DC voltage booster circuit 3 is connected with the direct current signal input of inverter circuit 4, the signal output part of inverter circuit 4 is connected with the signal input part of filter unit 5, the filtering signal output of filter unit 5 is connected with the filtering signal input of the switch 6 that is incorporated into the power networks, the signal output part of switch 6 of being incorporated into the power networks is connected with the signal input part of electric energy bidirectional measuring unit 7, the metering signal input/output terminal of electric energy bidirectional measuring unit 7 is connected with the metering signal input/output terminal of main control unit 10, the driving signal output part of main control unit 10 is connected with the driving signal input of drive circuit 8, the driving signal output part of drive circuit 8 and direct current input switch 2, DC voltage booster circuit 3, the driving signal input of inverter circuit 4 and the switch 6 that is connected connects, the sampled signal output of sample circuit 11 is connected with the sampled signal input of main control unit 10.
Existing permanent-magnetic wind driven generator is the alternating current that three-phase voltage, frequency all change with wind energy transformation, is the direct current of change in voltage with AC rectification by three phase rectifier unit 1.Size to direct voltage when working due to combining inverter has requirement, for improving the working range of blower fan, realize simultaneously the MPPT maximum power point tracking (MPPT) of blower fan, the variable DC voltage that this embodiment adopts DC voltage booster circuit 3 that rectification unit 1 is exported boosts, to satisfy the requirement of combining inverter.Inverter circuit 4 becomes frequency, fixed-size alternating current with the dc inverter of DC voltage booster circuit 3 output, then 5 filtering obtain simple sinusoidal alternating current through filter unit, and is transported in electrical network and goes, and finally realizes generating electricity by way of merging two or more grid systems of wind-driven generator.Consider the consumption of user load, be the electric energy of bidirectional measurement subscriber unit output (consumptions), increase electric energy bidirectional measuring unit 7, an end connection electrical network of electric energy bidirectional measuring unit 7, the other end connects main control unit 10, thereby calculates net electric generation by main control unit 10.
Concrete, sample circuit 11 can comprise that commutating voltage detecting unit, booster voltage detecting unit, boost current detection, network voltage detection and grid-connected current detect.The detection signal that sample circuit 11 gathers is processed through main control unit 10, produces SPWM and PWM and drives signal, through overdrive circuit 8 rear drive inverter circuits 4 and DC voltage booster circuit 3 work.
Preferably, the signal output part of main control unit 10 is connected with the signal input part of protective circuit 9, and the signal output part of protective circuit 9 is connected with the driving signal input of drive circuit 8.Under the operation irregularity state, drive circuit 8 is blocked in main control unit 10 control protection electric circuit 9 work, reaches the effect of protection system.
Preferably, the signal input output end of main control unit 10 is connected with human-computer interaction device 12 signal input output end, and human-computer interaction device 12 comprises button and the charactron on inverter, the input and output of data when being used for the direct control inverter.Main control unit 10 communication signal input/output terminals are connected with the communication signal input/output terminal of communication interface 13, and communication interface 13 is used for the communication with upper control machine and other inverters.
The control method of the wind power generation Intelligent single-phase net-connected controller that this embodiment provides is as follows:
Step 1: main control unit 10 (can adopt the STM32F103 chip) is by sample circuit 11 sampling line voltages, calculate by phase-locked loop, obtain the information such as line voltage, electrical network phase place, mains frequency, judge whether line voltage, frequency satisfy the condition that is incorporated into the power networks; If satisfy condition of work, enter step 2, otherwise continue to wait for;
Step 2: the three-phase alternating current of generator output is rectified into direct current through three phase rectifier unit 1, dc switch 2 closures, with this voltage effect to DC voltage booster circuit 3 (can adopt the BOOST booster circuit) front end; Main control unit 10 produces control signal, and through amplification rear drive DC voltage booster circuit 3 work of overdrive circuit 8, then output DC bus-bar voltage ± Vdc enters step 3;
Step 3: whether DC bus-bar voltage ± the Vdc of main control unit 10 sampling DC voltage booster circuit 3 outputs is in normal range of operation, then inverter circuit 4 is started working, under the adjusting of controller, inverter circuit 4 output one alternating voltages, its amplitude, phase place, frequency all should be consistent with electrical network, enter afterwards step 4, otherwise return to step 1;
Step 4: switch 6 closures that are incorporated into the power networks, main control unit 10 monitoring DC bus-bar voltage, line voltage, mains frequency, grid-connected current enter step 5, otherwise return to step 1 in normal range (NR);
Step 5: main control unit 10 real-time sampling DC voltage booster circuit 3 output voltages and electric currents transfer maximal power tracing to and control; Inverter circuit 4 begins to change over to the closed-loop control of being incorporated into the power networks, and carries electric current to electrical network.
A kind of wind power generation Intelligent single-phase net-connected controller that this embodiment provides has following characteristics:
1, DC side adopts the BOOST booster circuit, makes DC input voitage wider range, realizes simultaneously the function of blower fan MPPT maximum power point tracking (MPPT).
2, synchronized aspect adopts the single-phase phase-locked loop based on sef-adapting filter, accurately obtains electric network information, and the monitoring electrical network is abnormal.
3, the control section of inverter circuit, electric current loop adopts accurate ratio resonant regulator, in conjunction with unipolarity frequency multiplication SPWM modulation technique, realizes the meritorious idle control of grid-connected current, and satisfies corresponding current harmonics standard.
4, user load is directly connected in the inverter output point, and the electric energy that blower fan sends is preferentially personal, and unnecessary power delivery is to electrical network, at the access point place of subscriber unit, electric energy metering machine is set, and realizes the bidirectional measuring of net electric generation.
The above; only be the better embodiment of the present invention; but protection scope of the present invention is not limited to this; anyly be familiar with those skilled in the art in the technical scope that the embodiment of the present invention discloses; the variation that can expect easily or replacement are within all should being encompassed in protection scope of the present invention.Therefore, protection scope of the present invention should be as the criterion with the protection range of claim.

Claims (4)

1. wind power generation Intelligent single-phase net-connected controller, it is characterized in that, comprise three phase rectifier unit (1), direct current input switch (2), DC voltage booster circuit (3), inverter circuit (4), filter unit (5), the switch that is incorporated into the power networks (6), electric energy bidirectional measuring unit (7), drive circuit (8), main control unit (10) and sample circuit (11); the signal output part of three phase rectifier unit (1) is connected with the signal input part of direct current input switch (2), the DC signal output end of direct current input switch (2) is connected with the direct current signal input of DC voltage booster circuit (3), the DC signal output end of DC voltage booster circuit (3) is connected with the direct current signal input of inverter circuit (4), the signal output part of inverter circuit (4) is connected with the signal input part of filter unit (5), the filtering signal output of filter unit (5) is connected with the filtering signal input of the switch that is incorporated into the power networks (6), the signal output part of switch (6) of being incorporated into the power networks is connected with the signal input part of electric energy bidirectional measuring unit (7), the metering signal input/output terminal of electric energy bidirectional measuring unit (7) is connected with the metering signal input/output terminal of main control unit (10), the driving signal output part of main control unit (10) is connected with the driving signal input of drive circuit (8), the driving signal output part of drive circuit (8) and direct current input switch (2), DC voltage booster circuit (3), the driving signal input of inverter circuit (4) and the switch that is connected (6) connects, the sampled signal output of sample circuit (11) is connected with the sampled signal input of main control unit (10).
2. wind power generation Intelligent single-phase net-connected controller according to claim 1; it is characterized in that; described controller also comprises protective circuit (9); the signal output part of main control unit (10) is connected with the signal input part of protective circuit (9), and the signal output part of protective circuit (9) is connected with the driving signal input of drive circuit (8).
3. wind power generation Intelligent single-phase net-connected controller according to claim 1, it is characterized in that, described controller also comprises human-computer interaction device (12), and the signal input output end of main control unit (10) is connected with human-computer interaction device's (12) signal input output end.
4. wind power generation Intelligent single-phase net-connected controller according to claim 1, it is characterized in that, described controller also comprises communication interface (13), and main control unit (10) communication signal input/output terminal is connected with the communication signal input/output terminal of communication interface (13).
CN2013100712887A 2013-03-06 2013-03-06 Wind power generation intelligent single-phase grid-connection controller Pending CN103138291A (en)

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CN104135031A (en) * 2014-08-11 2014-11-05 四川慧盈科技有限责任公司 Wind power generation system
CN104348184A (en) * 2013-08-08 2015-02-11 无锡创联科技有限公司 Grid-connection and inversion integrating controller of wind driven generator
TWI499193B (en) * 2013-08-16 2015-09-01 Univ Nat Cheng Kung Power conversion apparatus and control method thereof
CN105324904A (en) * 2013-06-14 2016-02-10 巴莱诺斯清洁能源控股公司 Electric installation with improved gateway module
CN109416260A (en) * 2016-05-26 2019-03-01 兰迪斯+盖尔创新有限公司 The utility meter table used for Distributed-generation equipment
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Cited By (11)

* Cited by examiner, † Cited by third party
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CN105324904B (en) * 2013-06-14 2018-02-06 巴莱诺斯清洁能源控股公司 With the electric equipment for improving gateway module
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CN103346588A (en) * 2013-07-12 2013-10-09 浙江科技学院 Tap water flow grid-combining electricity generating device
CN104348184A (en) * 2013-08-08 2015-02-11 无锡创联科技有限公司 Grid-connection and inversion integrating controller of wind driven generator
TWI499193B (en) * 2013-08-16 2015-09-01 Univ Nat Cheng Kung Power conversion apparatus and control method thereof
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CN109416260A (en) * 2016-05-26 2019-03-01 兰迪斯+盖尔创新有限公司 The utility meter table used for Distributed-generation equipment
US10998731B2 (en) 2016-05-26 2021-05-04 Landis+Gyr Innovations, Inc. Utility meter for use with distributed generation device
US10948516B2 (en) 2019-01-10 2021-03-16 Landis+Gyr Innovations, Inc. Methods and systems for connecting and metering distributed energy resource devices
US10886748B1 (en) 2019-10-11 2021-01-05 Landis+Gyr Innovations, Inc. Metering and communications for distributed energy resource devices

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