CN206340983U - Suppress the device that DC bus-bar voltage is fluctuated in parallel network circuit - Google Patents
Suppress the device that DC bus-bar voltage is fluctuated in parallel network circuit Download PDFInfo
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- CN206340983U CN206340983U CN201720041176.0U CN201720041176U CN206340983U CN 206340983 U CN206340983 U CN 206340983U CN 201720041176 U CN201720041176 U CN 201720041176U CN 206340983 U CN206340983 U CN 206340983U
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Abstract
The utility model is related to electrical technology field, more particularly to a kind of device for suppressing DC bus-bar voltage fluctuation in parallel network circuit, the device includes generator unit, inverter, AC network, energy-storage units and control unit, inverter is connected by dc bus with generator unit, the direct current that generator unit is produced, which is converted to, is incorporated into AC network after alternating current, energy-storage units are connected by electric wire with dc bus, unnecessary power or convey power to dc bus that energy-storage units are used to absorb on dc bus, when Voltage Drop occurs for AC network, inverter will carry out low voltage crossing, control unit obtains the realtime power of generator unit side and the realtime power of alternating current net side, and control energy-storage units to absorb surplus power from dc bus or convey power to dc bus, the upper power of dc bus is avoided to undergo mutation, to suppress that voltage pulsation occurs on dc bus.
Description
Technical field
The utility model is related to DC bus-bar voltage in electrical technology field, more particularly to a kind of suppression parallel network circuit and fluctuated
Device.
Background technology
National standard《GB19964-2012 photo-voltaic power generation stations access power system technology regulation》Line voltage is worked as in middle requirement
When barrier falls for some reason, photovoltaic combining inverter need to keep in short-term simultaneously net state, possess certain power network enabling capabilities.And
Inverter needs to inject idle to power network during electrical network low voltage is passed through, and dynamic reactive electric current should meet claimed below：
(1) at the time of grid entry point Voltage Drop, the response time of dynamic reactive electric current is not more than 30ms.
(2) from dynamic current-responsive during voltage recovers to 0.9pu, photo-voltaic power generation station injects the nothing of power system
Work(dynamic current IT answers real-time tracking grid entry point voltage change, and meets：
IT≥1.5×(0.9-UT)IN (0.2≤UT≤0.9)
IT≥1.05×IN (UT<0.2)
IT=0 (UT>0.9)
Therefore when line voltage moment is fallen and grid-connected inverters electric current can not be mutated, therefore grid-connected inverters power understands moment
Fall, and inverter input power can not be mutated, so inverter dc bus power moment can be caused to increase, and then be caused straight
The rise of busbar voltage moment is flowed, whole photovoltaic generating system is endangered and normally runs.
Utility model content
(1) technical problem to be solved
The technical problems to be solved in the utility model is that DC bus-bar voltage holds when solving low voltage crossing in parallel network circuit
Easily fluctuate, and then the problem of crisis electricity generation system.
(2) technical scheme
In order to solve the above-mentioned technical problem, the utility model provides DC bus-bar voltage ripple in a kind of suppression parallel network circuit
Dynamic device, including generator unit, inverter, AC network, energy-storage units and control unit, the inverter are female by direct current
Line is connected with the generator unit, and the direct current that the generator unit is produced, which is converted to, is incorporated into AC network after alternating current；
The energy-storage units are connected by electric wire with dc bus, and described control unit is used for the real-time work(for obtaining the generator unit side
The realtime power of rate and alternating current net side, and control the energy-storage units to absorb surplus power from the dc bus or to institute
Dc bus conveying power is stated, to suppress to occur voltage pulsation on the dc bus.
Wherein, the two-way DC/AC units are the three phase full bridge circuit being made up of six power devices.
Wherein, two-way DC/AC units are provided between the dc bus and the energy-storage units.
Wherein, the energy-storage units include flywheel and motor, the motor connection in the two-way DC/AC units with it is described
Between flywheel.
Wherein, the generator unit is photovoltaic battery array, and the inverter is photovoltaic combining inverter.
Wherein, described control unit includes signal acquisition module, signal processing module and control module, the signal acquisition
Module is used for the voltage and current for gathering the alternating current net side, and the signal processing module is according to the alternating current voltage on line side
Value and current value obtain the instantaneous power of the alternating current net side, and according to the instantaneous power and the hair of the alternating current net side
The instantaneous power of electric unit output obtains the pulse signal needed for the two-way DC/AC units, and the control module is according to described
Pulse signal controls the working condition of the two-way DC/AC units.
(3) beneficial effect
Above-mentioned technical proposal of the present utility model has the following advantages that：The utility model provides a kind of suppression parallel network circuit
The device of middle DC bus-bar voltage fluctuation, it is single that the device includes generator unit, inverter, AC network, energy-storage units and control
Member, inverter is connected by dc bus with generator unit, and the direct current that generator unit is produced is converted to and be incorporated to after alternating current
To AC network, energy-storage units are connected by electric wire with dc bus, and energy-storage units are used to absorb unnecessary on dc bus
Power conveys power to dc bus, and control unit is used to obtain the realtime power of generator unit side and the reality of alternating current net side
When power, and control energy-storage units absorbed from dc bus surplus power or to the dc bus convey power, with suppress
Voltage pulsation occurs on dc bus.When Voltage Drop occurs for AC network, inverter will carry out low voltage crossing, control unit
Absorbed according to the signal of acquisition and the output control energy-storage units calculated or convey power to dc bus, it is to avoid dc bus
On power undergo mutation, suppress the phenomenon that fluctuates of DC bus-bar voltage so as to realize.
Except the utility model described above solve technical problem, constitute technical scheme technical characteristic and
Outside the technical characteristic for having the advantages that these technical schemes is brought, other technical characteristics of the present utility model and these technologies are special
The advantage brought is levied, will be further illustrated with reference to accompanying drawing.
Brief description of the drawings
Fig. 1 is the structure for suppressing the device that DC bus-bar voltage is fluctuated in parallel network circuit that the utility model embodiment is provided
Schematic diagram；
Fig. 2 is that the device circuit that DC bus-bar voltage is fluctuated in parallel network circuit that suppresses that the utility model embodiment is provided connects
Map interlinking；
Fig. 3 is the regulation and control for suppressing the device that DC bus-bar voltage is fluctuated in parallel network circuit that the utility model embodiment is provided
Flow chart.
In figure：1：AC network；2：Inverter；3：Generator unit；4：Two-way DC/AC units；5：Motor；6：Flywheel.
Embodiment
It is new below in conjunction with this practicality to make the purpose, technical scheme and advantage of the utility model embodiment clearer
Accompanying drawing in type embodiment, the technical scheme in the utility model embodiment is clearly and completely described, it is clear that retouched
The embodiment stated is a part of embodiment of the present utility model, rather than whole embodiments.Based on the reality in the utility model
Apply example, the every other embodiment that those of ordinary skill in the art are obtained on the premise of creative work is not made, all
Belong to the scope of the utility model protection.
, it is necessary to which explanation, unless otherwise clearly defined and limited, term " are pacified in description of the present utility model
Dress ", " connected ", " connection " should be interpreted broadly, for example, it may be fixedly connected or be detachably connected, or integratedly
Connection；Can be mechanical connection or electrical connection；Can be joined directly together, can also be indirectly connected to by intermediary,
It can be the connection of two element internals.For the ordinary skill in the art, above-mentioned art can be understood with concrete condition
Concrete meaning of the language in the utility model.
In addition, in description of the present utility model, unless otherwise indicated, " multiple ", " many ", " multigroup " are meant that two
Individual or two or more, " several ", " some ", " some groups " are meant that one or more.
As depicted in figs. 1 and 2, DC bus-bar voltage ripple in a kind of suppression parallel network circuit that the utility model embodiment is provided
Dynamic device, including generator unit 3, inverter 2, AC network 1, energy-storage units and control unit (being shown on figure), inverter 2
It is connected by dc bus with generator unit 3, the direct current that generator unit 3 is produced, which is converted to, is incorporated into alternating current after alternating current
Net 1, energy-storage units are connected by electric wire with dc bus, energy-storage units be used to absorbing unnecessary power on dc bus or to
Dc bus conveys power, and control unit is used to obtain the realtime power of generator unit side and the realtime power of alternating current net side,
And control energy-storage units to absorb surplus power from dc bus or convey power to the dc bus, to suppress dc bus
Upper generation voltage pulsation.When Voltage Drop occurs for AC network 1, inverter carries out low voltage crossings by 2, and control unit is according to obtaining
The signal taken and the output control energy-storage units calculated absorb or convey power to dc bus, it is to avoid the upper work(of dc bus
Rate is undergone mutation, and the phenomenon that DC bus-bar voltage is fluctuated is suppressed so as to realize.
Further, two-way DC/AC units 4 are provided between dc bus and energy-storage units, two-way DC/AC units 4 can
The bi-directional conversion of direct current and alternating current is realized, when there is unnecessary power on dc bus, two-way DC/AC units 4 are by direct current
Electricity is converted to alternating current supply energy-storage units, the transfer of surplus power on dc bus is realized, when being required supplementation with dc bus
During power, the alternating current in energy-storage units is converted to direct current supply dc bus by two-way DC/AC units 4.
Further, energy-storage units include flywheel 6 and motor 5, motor 5 be connected to two-way DC/AC units 4 and flywheel 6 it
Between, and the DC terminal of two-way DC/AC units 4 is in parallel with the DC terminal of inverter 2, the exchange end of two-way DC/AC units 4 and motor
5 are connected.
Further, in the present embodiment, generator unit 3 is photovoltaic battery array, and inverter 2 is photovoltaic grid-connected inversion
Device.
Further, the device also includes signal acquisition module, signal processing module and control module, signal acquisition module
Voltage and current for gathering the side of AC network 1, signal processing module according to the magnitude of voltage and current value of the side of AC network 1 and
The instantaneous power that generator unit 3 is exported obtains the pulse signal needed for two-way DC/AC units 4, and control module is according to pulse signal
Control the working condition of two-way DC/AC units 4.Specifically, signal acquisition module is by the three-phase electricity of the side of AC network 1 collected
Pressure and three-phase current pass to signal processing module, and signal processing module is first according to the three-phase voltage and three of the side of AC network 1
Phase current calculates the instantaneous power of AC network 1, and the power then exported with generator unit 3 is contrasted, and show that direct current is female
Unnecessary power either needs the power absorbed from energy-storage units on line, draws needs to two-way DC/ according to the performance number
The pulse signal that AC units 4 are sent, control module delivers stream according to the two-way DC/AC units 4 of pulse signal control in direct current
State either exchanges the state for turning direct current, and then realizes to absorb either the surplus power on dc bus to straight
Power on stream bus is supplemented.
Further, two-way DC/AC units 4 are the three phase full bridge circuit being made up of six power devices.Three phase full bridge electricity
Road is according to SVPWM control algolithms, with reference to phase locked algorithm, exports corresponding PWM ripples, six power devices of control are according to certain rule
Turned on and off.When needing from energy-storage units energy absorption, unit power factor rectifier is carried out, is converted alternating current to
Direct current；When needing to convey energy to energy-storage units, unity power factor inversion is carried out, by converting direct-current power into alternating-current power.
Power device uses insulated gate bipolar transistor IGBT and its corresponding drive circuit, it would however also be possible to employ power transistor GTR
Or Metal-oxide-semicondutor type field effect transistor M OSFET or gate turn off thyristor GTO.
As shown in figure 3, said apparatus is mainly included the following steps that when in use：
S1, obtains the direct current instantaneous power of generator unit output and the instantaneous power of alternating current net side；Specifically include S11,
The three-phase voltage V of alternating current net side is gathered by signal acquisition modulea、Vb、VcWith current signal Ia、Ib、Ic, wherein, Vc=0, Ic
=0；S12, the three-phase voltage to alternating current net side and three-phase current carry out CLARKE conversion and obtain voltage V respectivelyα、VβAnd electric current
Iα、Iβ, specific formula is as follows：
S13, to voltage Vα、VβWith electric current Iα、IβCarry out PARK conversion and obtain voltage Vd、VqWith electric current Id、Iq, specific formula
It is as follows：
S14, obtains AC network instantaneous power PgThe direct current instantaneous power P exported with generator unitdc, wherein, Pg=1.5
×(Vd×Id+Vq×Iq), Pdc=Udc×Idc；UdcThe DC voltage exported for generator unit, IdcFor the straight of generator unit output
Flow electric current.
S2, the direct current instantaneous power and the instantaneous power of AC network exported according to generator unit obtains to suppress straight
The power P that the electric busbar voltage fluctuation energy-storage units of stream should absorb or discharge from dc buse,Pe=Pdc-Pg。
S3, control instruction is obtained according to step S2 result to control energy-storage units from dc bus absorbed power or to straight
Bus delivered power is flowed, to suppress the voltage pulsation of dc bus.
Step S3 is specifically included：
S31, obtains the given value of current command value i of motor q axlesqref, wherein, iqref=Pe/ P × ω × ψ, ω are motor
Angular rate；P is motor number of pole-pairs；ψ is motor permanent magnet magnetic linkage；
S32, compares the given value of current command value i of motorqrefAnd actual value, space vector pulse width is obtained according to comparative result
The control voltage reference value of modulation algorithm；
S33, the pwm pulse according to needed for control voltage reference value generates two-way DC/AC units, so that as desired from straight
Bus absorbed power is flowed or to dc bus delivered power, to suppress the voltage pulsation of dc bus.
In summary, the dress that DC bus-bar voltage is fluctuated in a kind of suppression parallel network circuit that the utility model embodiment is provided
Put, the three-phase voltage and three-phase current of the alternating current net side collected are passed to signal processing module by signal acquisition module, believe
Number processing module calculates the instantaneous power of AC network according to the three-phase voltage and three-phase current of alternating current net side first, then
The power exported with generator unit is contrasted, and is drawn power unnecessary on dc bus or is needed to inhale from energy-storage units
The power of receipts, the pulse signal for needing to send to two-way DC/AC units is drawn according to the performance number, and control module is believed according to pulse
Number two-way DC/AC units of control deliver stream mode or exchange in direct current and turn the state of direct current, and then realize to straight
Surplus power on stream bus absorb or the power on dc bus is supplemented, it is to avoid dc bus it is upper
Power is undergone mutation, and the phenomenon that DC bus-bar voltage is fluctuated is suppressed so as to realize.
Finally it should be noted that：Above example is only to illustrate the technical solution of the utility model, rather than its limitations；
Although the utility model is described in detail with reference to the foregoing embodiments, it will be understood by those within the art that：
It can still modify to the technical scheme described in foregoing embodiments, or to which part technical characteristic progress etc.
With replacement；And these modifications or replacement, the essence of appropriate technical solution is departed from each embodiment technology of the utility model
The spirit and scope of scheme.
Claims (6)
1. a kind of suppress the device that DC bus-bar voltage is fluctuated in parallel network circuit, it is characterised in that：Including generator unit, inversion
Device, AC network, energy-storage units and control unit, the inverter are connected by dc bus with the generator unit, by institute
The direct current for stating generator unit generation is converted to AC network is incorporated into after alternating current；The energy-storage units pass through electric wire and direct current
Bus is connected, and described control unit is used to obtain the realtime power of the generator unit side and the realtime power of alternating current net side,
And control the energy-storage units to absorb surplus power from the dc bus or convey power to the dc bus, to suppress
Occurs voltage pulsation on the dc bus.
2. according to claim 1 suppress the device that DC bus-bar voltage is fluctuated in parallel network circuit, it is characterised in that：It is described
Two-way DC/AC units are provided between dc bus and the energy-storage units.
3. according to claim 2 suppress the device that DC bus-bar voltage is fluctuated in parallel network circuit, it is characterised in that：It is described
Two-way DC/AC units include the three phase full bridge circuit being made up of six power devices.
4. according to claim 2 suppress the device that DC bus-bar voltage is fluctuated in parallel network circuit, it is characterised in that：It is described
Energy-storage units include flywheel and motor, and the motor connection is between two-way the DC/AC units and the flywheel.
5. according to claim 1 suppress the device that DC bus-bar voltage is fluctuated in parallel network circuit, it is characterised in that：It is described
Generator unit is photovoltaic battery array, and the inverter is photovoltaic combining inverter.
6. according to claim 2 suppress the device that DC bus-bar voltage is fluctuated in parallel network circuit, it is characterised in that：It is described
Control unit includes signal acquisition module, signal processing module and control module, and the signal acquisition module is used to gather described
The voltage and current of alternating current net side, the signal processing module obtains institute according to the alternating current net side magnitude of voltage and current value
State the instantaneous power of alternating current net side, and instantaneous power according to the alternating current net side and generator unit output is instantaneous
Power obtains the pulse signal needed for the two-way DC/AC units, and the control module is according to being controlled the pulse signal
The working condition of two-way DC/AC units.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720041176.0U CN206340983U (en) | 2017-01-13 | 2017-01-13 | Suppress the device that DC bus-bar voltage is fluctuated in parallel network circuit |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720041176.0U CN206340983U (en) | 2017-01-13 | 2017-01-13 | Suppress the device that DC bus-bar voltage is fluctuated in parallel network circuit |
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| CN206340983U true CN206340983U (en) | 2017-07-18 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106602609A (en) * | 2017-01-13 | 2017-04-26 | 北京群菱能源科技有限公司 | Device and method for suppressing DC bus voltage fluctuation in grid-connected circuit |
| CN113589076A (en) * | 2021-07-23 | 2021-11-02 | 西门子（中国）有限公司 | Method for simulating motor load in flywheel energy storage and computer readable medium |
-
2017
- 2017-01-13 CN CN201720041176.0U patent/CN206340983U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106602609A (en) * | 2017-01-13 | 2017-04-26 | 北京群菱能源科技有限公司 | Device and method for suppressing DC bus voltage fluctuation in grid-connected circuit |
| CN113589076A (en) * | 2021-07-23 | 2021-11-02 | 西门子（中国）有限公司 | Method for simulating motor load in flywheel energy storage and computer readable medium |
| CN113589076B (en) * | 2021-07-23 | 2024-04-02 | 西门子（中国）有限公司 | Simulation method and computer readable medium for motor load in flywheel energy storage |
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