CN206250774U - A kind of power conversion unit with static reactive power compensation - Google Patents
A kind of power conversion unit with static reactive power compensation Download PDFInfo
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- CN206250774U CN206250774U CN201621405031.6U CN201621405031U CN206250774U CN 206250774 U CN206250774 U CN 206250774U CN 201621405031 U CN201621405031 U CN 201621405031U CN 206250774 U CN206250774 U CN 206250774U
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- Y—GENERAL 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
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/30—Reactive power compensation
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Abstract
The utility model discloses a kind of power conversion unit with static reactive power compensation, it includes inversion unit, switch S, wave filter.Inversion unit passes sequentially through wave filter, switch S, then is electrically connected to power network by a transformer T.Wave filter includes at least two groups filter capacitor groups and filter inductance Lm.One end of at least one filter capacitor C1 of one of which filter capacitor group is electrically connected between filter inductance Lm and switch S, and another group of one end of at least one filter capacitor C2 ' of filter capacitor group is electrically connected between switch S and transformer T via corresponding switch S1 '.When power conversion unit generates electricity by way of merging two or more grid systems, switch S closures, and the closure quantity for switching S1 ' does not know, but when not generating electricity by way of merging two or more grid systems, at least one switch S1 ' needs to be closed again immediately after all switches disconnect.The utility model can realize the static reactive power compensation to transformer at night, it is to avoid energy loss.
Description
Technical field
The utility model is related to a kind of power conversion unit, more particularly to a kind of power conversion with static reactive power compensation
Device.
Background technology
Existing power conversion unit is according to the difference of application scenario, it is necessary to the different energy, such as photovoltaic DC-to-AC converter need too
Sunlight, for another example wind-powered electricity generation, battery, it is necessary to the energy it is then different.Current power conversion unit generally comprises inversion unit, opens
S, filter unit (or wave filter) are closed, the inversion unit is electrically connected to power network by switching S via transformer T.When white
When its power conversion unit generates electricity by way of merging two or more grid systems, switch S needs closure, when night power conversion unit stops generating electricity by way of merging two or more grid systems, switchs S
Disconnect.Therefore grid-connected power conversion unit can not only generate electricity at night, and the transformer of its connection can also consume power network
Energy, especially apply the power conversion unit in field of solar energy.
Utility model content
For above-mentioned technological deficiency, the utility model provides a kind of power conversion unit with static reactive power compensation, solution
Certainly prior art can consume power grid energy at night, cause the technical problem of energy loss, and the utility model can be realized
At night to the static reactive power compensation of transformer, it is to avoid energy loss.
Solution of the present utility model is：A kind of power conversion unit with static reactive power compensation, it includes inversion
Unit, switch S, wave filter, the inversion unit pass sequentially through wave filter, switch S, then are electrically connected with by a transformer T
To power network；The wave filter includes filter inductance Lm and at least two groups filter capacitor groups, and filter inductance Lm is electrically connected at described
Between inversion unit and switch S；One of which filter capacitor group include at least one filter capacitor C1, and filter capacitor C1 one
End is electrically connected between filter inductance Lm and switch S, the other end electrical ground of filter capacitor C1；Wherein another group filtered electrical
Appearance group includes at least one corresponding switch S1 ' of at least one filter capacitor C2 ' and at least one filter capacitor C2 ', and filter
One end of ripple electric capacity C2 ' is electrically connected between switch S and transformer T via corresponding switch S1 ', and filter capacitor C2's ' is another
One end electrical ground；When the power conversion unit generates electricity by way of merging two or more grid systems, switch S closures, and the closure quantity for switching S1 ' does not know,
But when the power conversion unit does not generate electricity by way of merging two or more grid systems, at least one switch S1 ' needs immediately again after all switches disconnect
Closure.
Used as the further improvement of such scheme, all of filter capacitor is the power conversion unit when generating electricity by way of merging two or more grid systems
Ac filter electric capacity；When the power conversion unit generates electricity by way of merging two or more grid systems, all switches are closed, and the power conversion unit is not simultaneously
Net generate electricity when, all switches after disconnecting all switch S1 ' be closed again immediately.
As the further improvement of such scheme, the quantity of filter capacitor C2 ' for two and more than, corresponding switch S1 '
Quantity also for two and more than；All of filter capacitor is the ac filter electricity when power conversion unit generates electricity by way of merging two or more grid systems
Hold；When generating electricity by way of merging two or more grid systems, all switches are closed the power conversion unit, when the power conversion unit does not generate electricity by way of merging two or more grid systems,
After all switches disconnect, at least one switch S1 ' is closed again immediately.
As the further improvement of such scheme, the quantity of filter capacitor C2 ' for two and more than, corresponding switch S1 '
Quantity also for two and more than；All filter capacitor C1 are plus a part of filter capacitor C2 ' for the power conversion unit exists
Ac filter electric capacity when generating electricity by way of merging two or more grid systems；When the power conversion unit generates electricity by way of merging two or more grid systems, not only switch S closure, and with conduct
The corresponding switch S1 ' of ac filter electric capacity is also closed, and when the power conversion unit does not generate electricity by way of merging two or more grid systems, all switches break
After opening, at least one switch S1 ' is closed again immediately.
As the further improvement of such scheme, wherein another group of filter capacitor group also include at least one inductance L1 ' and
At least one at least one inductance L1 ' corresponding switch K1 '；One end of each inductance L1 ' is electrical via corresponding switch K1 '
It is connected between switch S and transformer T, the other end electrical ground of each inductance L1 '；All of filter capacitor is the power
Ac filter electric capacity of the converting means when generating electricity by way of merging two or more grid systems；When the power conversion unit generates electricity by way of merging two or more grid systems, S and all switches are switched
S1 ' is closed, when the power conversion unit does not generate electricity by way of merging two or more grid systems, all switches disconnect after at least one switch S1 ' and/or extremely
Few switch K1 ' is closed again immediately.
As the further improvement of such scheme, wherein another group of filter capacitor group also include at least one inductance L1 ' and
At least one at least one inductance L1 ' corresponding switch K1 '；One end of each inductance L1 ' is electrical via corresponding switch K1 '
It is connected between switch S and transformer T, the other end electrical ground of each inductance L1 '；The quantity of filter capacitor C2 ' is two
And more than, the quantity of corresponding switch S1 ' also for two and more than；All filter capacitor C1 add a part of filter capacitor C2 '
The ac filter electric capacity for being the power conversion unit when generating electricity by way of merging two or more grid systems；When the power conversion unit generates electricity by way of merging two or more grid systems, not only
Switch S closures, and also close with as the corresponding switch S1 ' of ac filter electric capacity, and the power conversion unit is not simultaneously
When net generates electricity, after all switches disconnect, at least one switch S1 ' and/or at least one switch K1 ' are closed again immediately.
As the further improvement of such scheme, wherein another group of filter capacitor group also include at least one inductance L1 ' and
At least one at least one inductance L1 ' corresponding switch K1 '；One end of each inductance L1 ' is electrical via corresponding switch K1 '
It is connected between switch S and transformer T, the other end electrical ground of each inductance L1 '；The quantity of filter capacitor C2 ' is two
And more than, the quantity of corresponding switch S1 ' also for two and more than；All filter capacitors are described plus a part of inductance L1 '
Ac filter electric capacity of the power conversion unit when generating electricity by way of merging two or more grid systems；When the power conversion unit generates electricity by way of merging two or more grid systems, not only switch S and close
Close, and also closed with as the corresponding switch S1 ' of ac filter electric capacity and/or switch K1 ', the power conversion unit
When not generating electricity by way of merging two or more grid systems, after all switches disconnect, at least one switch S1 ' and/or at least one switch K1 ' are closed again immediately.
As the further improvement of such scheme, wherein another group of filter capacitor group also include at least two inductance L1 ' and
At least two at least two inductance L1 ' corresponding switch K1 '；One end of each inductance L1 ' is electrical via corresponding switch K1 '
It is connected between switch S and transformer T, the other end electrical ground of each inductance L1 '；The quantity of filter capacitor C2 ' is two
And more than, the quantity of corresponding switch S1 ' also for two and more than；All filter capacitor C1 add a part of filter capacitor C2 '
It is together ac filter electric capacity of the power conversion unit when generating electricity by way of merging two or more grid systems along with a part of inductance L1 '；The power
When converting means generates electricity by way of merging two or more grid systems, not only switch S closures, and with as the corresponding switch S1 ' of ac filter electric capacity and switch
K1 ' is also closed, when the power conversion unit does not generate electricity by way of merging two or more grid systems, after all switches disconnect, at least one switch S1 ' and/
Or at least one switch K1 ' be closed again immediately.
Used as the further improvement of such scheme, all switches are all electronic switches, and the power conversion unit passes through one
Individual controller controls the adhesive or disconnection of these electronic switches.
As the further improvement of such scheme, filter inductance Lg is also serially connected between filter inductance Lm and switch S.
The utility model has night no-power compensation function, can be by the filter of the power conversion unit with static reactive power compensation
The electric capacity of ripple device removes a part as reactive-load compensation, thus in the case where additionally reactive power compensator or device is not increased,
Can compensate for the night reactive loss of transformer.
Brief description of the drawings
Fig. 1 is the circuit diagram of the power conversion unit with static reactive power compensation of the utility model embodiment 1.
Fig. 2 is the circuit diagram of the power conversion unit with static reactive power compensation of the utility model embodiment 2.
Fig. 3 is the circuit diagram of the power conversion unit with static reactive power compensation of the utility model embodiment 3.
Fig. 4 is the circuit diagram of the power conversion unit with static reactive power compensation of the utility model embodiment 4.
Fig. 5 is the circuit diagram of the power conversion unit with static reactive power compensation of the utility model embodiment 5.
Fig. 6 is the circuit diagram of the power conversion unit with static reactive power compensation of the utility model embodiment 6.
Fig. 7 is the circuit diagram of the power conversion unit with static reactive power compensation of the utility model embodiment 7.
Fig. 8 is the circuit diagram of the power conversion unit with static reactive power compensation of the utility model embodiment 8.
Fig. 9 is the circuit diagram of the power conversion unit with static reactive power compensation of the utility model embodiment 9.
Specific embodiment
In order that the purpose of this utility model, technical scheme and advantage become more apparent, below in conjunction with accompanying drawing and implementation
Example, is further elaborated to the utility model.It should be appreciated that specific embodiment described herein is only used to explain
The utility model, is not used to limit the utility model.
Power conversion unit with static reactive power compensation of the present utility model, it includes inversion unit, switch S, filtering
Device, the inversion unit passes sequentially through wave filter, switch S, then is electrically connected to power network by a transformer T.Wave filter bag
Filter inductance Lm and at least two groups filter capacitor groups are included, filter inductance Lm is electrically connected between the inversion unit and switch S.
One of which filter capacitor group includes at least one filter capacitor C1, and one end of filter capacitor C1 is electrically connected at filter inductance
Between Lm and switch S, the other end electrical ground of filter capacitor C1.Wherein another group filter capacitor group includes at least one filtering
Electric capacity C2 ' and at least one filter capacitor C2 ' it is corresponding at least one switch S1 ', and filter capacitor C2 ' one end via phase
The switch S1 ' for answering is electrically connected between switch S and transformer T, the other end electrical ground of filter capacitor C2 '.The power
When converting means generates electricity by way of merging two or more grid systems, switch S closures, and the closure quantity for switching S1 ' does not know, but the power conversion unit is not
When generating electricity by way of merging two or more grid systems, at least one switch S1 ' needs to be closed again immediately after all switches disconnect.It is real that 9 are described in the present case
Example is applied to be proved.
Embodiment 1
Fig. 1 is referred to, the power conversion unit with static reactive power compensation of the present utility model mainly includes inversion unit
U, wave filter, switch S.Inversion unit U passes sequentially through wave filter, switch S, then is electrically connected to power network by a transformer T
W, wave filter is arranged on switch S near the side of inversion unit U.Switch S is switched for inverter ac side, can be contactor,
Or AC circuit breaker.
Wave filter includes filter inductance Lm and at least two groups filter capacitor groups.Filter inductance Lm is electrically connected at the inversion
Between unit and switch S.One of which filter capacitor group includes at least one filter capacitor C1, and one end of filter capacitor C1 is electric
Property be connected to filter inductance Lm and switch S between, the other end electrical ground of filter capacitor C1.Wherein another group filter capacitor group
Including at least one corresponding switch S1 ' of at least one filter capacitor C2 ' and at least one filter capacitor C2 ', and filtered electrical
The one end for holding C2 ' is electrically connected between switch S and transformer T via corresponding switch S1 ', the other end of filter capacitor C2 '
Electrical ground.When the power conversion unit generates electricity by way of merging two or more grid systems, switch S closures, and the closure quantity for switching S1 ' does not know, but
When the power conversion unit does not generate electricity by way of merging two or more grid systems, at least one switch S1 ' needs to be closed again immediately after all switches disconnect.
All of filter capacitor is ac filter electric capacity of the power conversion unit when generating electricity by way of merging two or more grid systems；The power becomes
When changing device generates electricity by way of merging two or more grid systems, all switches are closed, when the power conversion unit does not generate electricity by way of merging two or more grid systems, after all switches disconnect
All switch S1 ' are closed again immediately.
In the present embodiment, the quantity of filter capacitor C1 and filter capacitor C2 ' is 1 and does for example, filter capacitor
C2 ' is embodied in the present embodiment for the quantity of filter capacitor C2, corresponding switch S1 ' is also one, is embodied in the present embodiment
It is switch S1.Functioning switch for convenience, all switches are all electronic switches, and the power conversion unit is single by a control
First CPU controls the adhesive or disconnection of these electronic switches.When S disconnections are switched, it is low that described control unit also can detect transformer T
The reactive power of side is pressed, and obtains being currently needed for the idle amount of compensation according to the size of the reactive power for detecting, and to meet
It is currently needed for the switch S1 closures of the idle amount control respective numbers of compensation.
Power conversion unit with static reactive power compensation of the present utility model, its topological structure having has night quiet
State no-power compensation function, sharpest edges of the present utility model are, can be to the current power conversion with static reactive power compensation
Device carries out field upgrade, such as in the present embodiment 1, electric capacity C1 and electric capacity C2 is split as by by current LC wave filters, opens
It is the contactor for controlling electric capacity C2 to access the whole power conversion unit with static reactive power compensation to close S1, and CPU is opened for control
Close the controller of S1 adhesives or disconnection.When having the power conversion unit of static reactive power compensation normal grid-connected daytime, two are opened
S, S1 adhesive are closed, two electric capacity C1, C2 work as the ac filter electric capacity of the power conversion unit with static reactive power compensation.
When night there is the power conversion unit of static reactive power compensation not generate electricity by way of merging two or more grid systems, switch S disconnects.CPU controlling switch S1 adhesives,
Idle, the saving electric energy of compensator transformer T losses.Certainly, the filtering of the power conversion unit with static reactive power compensation is being met
While needs, it is also possible to when having daytime the power conversion unit of static reactive power compensation normal grid-connected, disconnect switch S1.
Embodiment 2
Power conversion unit topological structure with static reactive power compensation as shown in Fig. 2 be with the difference of embodiment 1：
In example 2, the quantity of filter capacitor C2 ' be two and more than, the quantity of corresponding switch S1 ' also for two and more than；
All of filter capacitor is the ac filter electric capacity when power conversion unit generates electricity by way of merging two or more grid systems；The power conversion unit is simultaneously
When net generates electricity, all switches are closed, when the power conversion unit does not generate electricity by way of merging two or more grid systems, after all switches disconnect, and at least one
Individual switch S1 ' is closed again immediately.
Filter capacitor C2 ' embody in the present embodiment for filter capacitor C2 ..., Cn, switch S1 ' be embodied in the present embodiment
In for switch S2 ..., Sn.
The electric capacity C of the LC wave filters of the power conversion unit with static reactive power compensation can be split as N by the utility model
Individual electric capacity：C1, C2~Cn, S are power conversion unit AC switch (contactor, alternating current interruption with static reactive power compensation
Device), S2~Sn (for the ease of statement, the switch of the present embodiment is calculated since S2) accesses circuit for control electric capacity C2~Cn
Switch, CPU is the controller for controlling S2~Sn adhesives or disconnection.There is the power conversion unit of static reactive power compensation when daytime
When normal grid-connected, switch S, switch S2~Sn adhesives, electric capacity C1, electric capacity C2~Cn become as the power with static reactive power compensation
The ac filter electric capacity work of changing device.When night there is the power conversion unit of static reactive power compensation not generate electricity by way of merging two or more grid systems, open
S is closed to disconnect.CPU disconnects C2~Cn first, and the reactive power in detection circuit, the size calculating of the reactive power according to detection is answered
When the idle amount of compensation, one or more adhesives in controlling switch S2~SN, until the electric capacity adequate remedy transformer T for putting into
What is be lost is idle, and the purpose of electric energy is saved to reach.
Embodiment 3
Photovoltaic becomes device topological structure as shown in figure 3, being with the difference of embodiment 2：In embodiment 3, filter capacitor C2 '
Quantity for two and more than, the quantity of corresponding switch S1 ' also for two and more than；All filter capacitor C1 are plus a part
Filter capacitor C2 ' is ac filter electric capacity of the power conversion unit when generating electricity by way of merging two or more grid systems；The power conversion unit is grid-connected
During generating, S closures are not only switched, and also closed with as the corresponding switch S1 ' of ac filter electric capacity, the power becomes
When changing device does not generate electricity by way of merging two or more grid systems, after all switches disconnect, at least one switch S1 ' is closed again immediately.
Filter capacitor C2 ' embody in the present embodiment for filter capacitor C2 ..., Cm ..., Cn, switch S1 ' be embodied in
In the present embodiment for switch S2 ..., Sm ..., Sn.
The electric capacity C of the power conversion unit LC wave filters with static reactive power compensation can be split as m by the utility model
Electric capacity：C1, C2~Cm, it is the electric capacity of non-filtered device that electric capacity Cm+1~Cn is increased in addition.S is the power with static reactive power compensation
Converting means AC switchs (contactor, AC circuit breaker), and S2~Sn is the switch for controlling electric capacity C2~Cn to access circuit,
CPU is the controller of controlling switch S2~Sn adhesives or disconnection.The power conversion unit for having static reactive power compensation when daytime is just
When often grid-connected, switch S, switch S2~Sm adhesives, switch Sm+1~Sn disconnect, and electric capacity C1, electric capacity C2~Cm are used as with static state
The ac filter electric capacity work of the power conversion unit of reactive-load compensation.
When night there is the power conversion unit of static reactive power compensation not generate electricity by way of merging two or more grid systems, switch S disconnects.CPU breaks first
Switch S2~Sn, the reactive power in detection circuit, it is idle that the size calculating according to the reactive power for detecting should be compensated
Amount, one or more adhesives in controlling switch S2~Sn, until put into electric capacity adequate remedy transformer T loss it is idle,
The purpose of electric energy is saved to reach.
Embodiment 4
Power conversion unit topological structure with static reactive power compensation as shown in figure 4, be with the difference of embodiment 1：
In example 4, wherein another group of filter capacitor group also includes that at least one inductance L1 ' and at least one inductance L1 ' is corresponding
At least one switch K1 '；One end of each inductance L1 ' is electrically connected at switch S and transformer T via corresponding switch K1 '
Between, the other end electrical ground of each inductance L1 '；All of filter capacitor is the power conversion unit when generating electricity by way of merging two or more grid systems
Ac filter electric capacity；When the power conversion unit generates electricity by way of merging two or more grid systems, switch S and all switch S1 ' is closed, and the power becomes
When changing device does not generate electricity by way of merging two or more grid systems, at least one switch S1 ' and/or at least one switchs K1 ' immediately again after all switches disconnect
Closure.
Filter capacitor C2 ' embody in the present embodiment for filter capacitor C2 ..., Cn, switch S1 ' be embodied in the present embodiment
In for switch S2 ..., Sn, switch K1 ' embody in the present embodiment for switch K1 ..., Kn, inductance L1 ' is embodied in this reality
Apply in example for switch L1 ..., Ln.
Can be split as the electric capacity C of the power conversion unit LC wave filters with static reactive power compensation N number of by the utility model
Electric capacity：C1, C2~Cn；It is the idle inductance of compensator transformer T to increase inductance L1~Ln, and S is the work(with static reactive power compensation
Rate converting means AC switchs (contactor, AC circuit breaker), and S2~Sn is the switch for controlling electric capacity C2~Cn to access circuit,
K1~Kn is the switch for controlling L1~Ln to access circuit, and CPU is the control of controlling switch S2~Sn, switch K1~Kn adhesives or disconnection
Device processed.When having the power conversion unit of static reactive power compensation normal grid-connected daytime, switch S, switch S2~Sn adhesives, switch
K1~Kn disconnect, electric capacity C1, electric capacity C2~Cn as the power conversion unit with static reactive power compensation ac filter electric capacity
Work.
When night there is the power conversion unit of static reactive power compensation not generate electricity by way of merging two or more grid systems, switch S disconnects.CPU breaks first
Switch S2~Sn, switch K1~Kn, the reactive power in detection circuit, the size of the reactive power according to detection is calculated should
The idle amount of compensation, one or more adhesives in controlling switch S2~Sn, switch K1~Kn, until the electric capacity for putting into is mended enough
The idle of transformer T losses is repaid, the purpose of electric energy is saved to reach.
Embodiment 5
Power conversion unit topological structure with static reactive power compensation as shown in figure 5, be with the difference of embodiment 1：
In embodiment 5, wherein another group of filter capacitor group also includes that at least one inductance L1 ' and at least one inductance L1 ' is corresponding
At least one switch K1 '；One end of each inductance L1 ' is electrically connected at switch S and transformer T via corresponding switch K1 '
Between, the other end electrical ground of each inductance L1 '；The quantity of filter capacitor C2 ' be two and more than, corresponding switch S1 '
Quantity also for two and more than；All filter capacitor C1 are plus a part of filter capacitor C2 ' for the power conversion unit exists
Ac filter electric capacity when generating electricity by way of merging two or more grid systems；When the power conversion unit generates electricity by way of merging two or more grid systems, not only switch S closure, and with conduct
The corresponding switch S1 ' of ac filter electric capacity is also closed, and when the power conversion unit does not generate electricity by way of merging two or more grid systems, all switches break
After opening, at least one switch S1 ' and/or at least one switch K1 ' are closed again immediately.
Filter capacitor C2 ' embody in the present embodiment for filter capacitor C2 ..., Cm ..., Cn, switch S1 ' be embodied in
In the present embodiment for switch S2 ..., Sm ..., Sn, switch K1 ' embody in the present embodiment for switch K1 ..., Kn, electricity
Sense L1 ' embody in the present embodiment for switch L1 ..., Ln.
The electric capacity C of the power conversion unit LC wave filters with static reactive power compensation is split as m electricity by the utility model
Hold：C1, C2~Cm, it is the electric capacity of non-filtered device that electric capacity Cm+1~Cn is increased in addition.Inductance L1~Ln is that compensator transformer T is idle
Inductance, S be with static reactive power compensation power conversion unit AC switch (contactor, AC circuit breaker), S2~Sn
The switch of circuit is accessed for control electric capacity C2~Cn, K1~Kn is the switch for controlling L1~Ln to access circuit, and CPU is controlling switch
The controller of S2~Sn, switch K1~Kn adhesives or disconnection.Have the power conversion unit of static reactive power compensation normal when daytime
When grid-connected, switch S, switch S2~Sm adhesives switch Sm+1~Sn, and switch K1~Kn disconnects, electric capacity C1, electric capacity C2~Cm conducts
The ac filter electric capacity work of the power conversion unit with static reactive power compensation.
When night there is the power conversion unit of static reactive power compensation not generate electricity by way of merging two or more grid systems, switch S disconnects.CPU breaks first
Switch S2~Sn, switch K1~Kn, the reactive power in detection circuit, the size of the reactive power according to detection is calculated should
The idle amount of compensation, one or more adhesives in controlling switch S2~Sn, switch K1~Kn, until the electric capacity for putting into is mended enough
The idle of transformer T losses is repaid, the purpose of electric energy is saved to reach.
Embodiment 6
Power conversion unit topological structure with static reactive power compensation as shown in fig. 6, be with the difference of embodiment 1：
In embodiment 6, wherein another group of filter capacitor group also includes that at least one inductance L1 ' and at least one inductance L1 ' is corresponding
At least one switch K1 '；One end of each inductance L1 ' is electrically connected at switch S and transformer T via corresponding switch K1 '
Between, the other end electrical ground of each inductance L1 '；The quantity of filter capacitor C2 ' be two and more than, corresponding switch S1 '
Quantity also for two and more than；All filter capacitors plus a part of inductance L1 ' be the power conversion unit in grid-connected hair
Ac filter electric capacity when electric；When the power conversion unit generates electricity by way of merging two or more grid systems, not only switch S closures, and with as exchanging filter
The corresponding switch S1 ' of ripple electric capacity and/or switch K1 ' are also closed, when the power conversion unit does not generate electricity by way of merging two or more grid systems, Suo Youkai
After Guan Jun disconnects, at least one switch S1 ' and/or at least one switch K1 ' are closed again immediately.
Filter capacitor C2 ' embody in the present embodiment for filter capacitor C2 ..., Cn, switch S1 ' be embodied in the present embodiment
In for switch S2 ..., Sn, switch K1 ' embody in the present embodiment for switch K1 ..., Km ..., Kn, inductance L1 ' bodies
Now in the present embodiment for switch L1 ..., Lm ..., Ln.
Can be split as the electric capacity C of the power conversion unit LC wave filters with static reactive power compensation N number of by the utility model
Electric capacity：C1, C2~Cn, are further added by inductance L1~Lm for filter capacitor shunt inductance, inductance Lm+1~Ln be compensator transformer T without
The inductance of work(, S is that the power conversion unit AC with static reactive power compensation switchs (contactor, AC circuit breaker), S2~
Sn is the switch for controlling electric capacity C2~Cn to access circuit, and K1~Kn is the switch for controlling inductance L1~Ln to access circuit, and CPU is control
The controller of system switch S2~Sn, switch K1~Kn adhesives or disconnection.When the power conversion that daytime has static reactive power compensation is filled
When putting normal grid-connected, switch S, switch S2~Sn switch K1~Km adhesives, and switch Km+1~Kn disconnects, and electric capacity C1, electric capacity C2~
Cn as the power conversion unit with static reactive power compensation ac filter electric capacity, inductance L1~Lm as filter capacitor and
Connection inductance work.
When night there is the power conversion unit of static reactive power compensation not generate electricity by way of merging two or more grid systems, switch S disconnects.CPU breaks first
Switch S2~Sn, switch K1~Kn, the reactive power in detection circuit, the size of the reactive power according to detection is calculated should
The idle amount of compensation, one or more adhesives in controlling switch S2~Sn, switch K1~Kn, until the capacitance compensation for putting into becomes
It is idle that depressor T is lost, and the purpose of electric energy is saved to reach.
Embodiment 7
Power conversion unit topological structure with static reactive power compensation as shown in fig. 7, be with the difference of embodiment 1：
In embodiment 7, wherein another group of filter capacitor group also includes that at least two inductance L1 ' and at least two inductance L1 ' are corresponding
At least two switch K1 '；One end of each inductance L1 ' is electrically connected at switch S and transformer T via corresponding switch K1 '
Between, the other end electrical ground of each inductance L1 '；The quantity of filter capacitor C2 ' be two and more than, corresponding switch S1 '
Quantity also for two and more than；All filter capacitor C1 add a part of inductance L1 ' plus a part of filter capacitor C2 '
It is ac filter electric capacity of the power conversion unit when generating electricity by way of merging two or more grid systems to rise；When the power conversion unit generates electricity by way of merging two or more grid systems, no
Only switch S closures, and also closed with as the corresponding switch S1 ' of ac filter electric capacity and switch K1 ', the power change
When changing device does not generate electricity by way of merging two or more grid systems, after all switches disconnect, at least one switch S1 ' and/or at least one switchs K1 ' immediately again
Closure.
Filter capacitor C2 ' embody in the present embodiment for filter capacitor C2 ..., Cm ..., Cn, switch S1 ' be embodied in
In the present embodiment for switch S2 ..., Sm ..., Sn, switch K1 ' embody in the present embodiment for switch K1 ...,
Km ..., Kn, inductance L1 ' embody in the present embodiment for switch L1 ..., Lm ..., Ln.
The electric capacity C of the power conversion unit LC wave filters with static reactive power compensation can be split as m by the utility model
Electric capacity：C1, C2~Cm, it is the electric capacity of non-filtered device that electric capacity Cm+1~Cn is increased in addition.Inductance L1~Lm is filter capacitor in parallel
Inductance, inductance Lm+1~Ln is the idle inductance of compensator transformer T, and S is that the power conversion unit with static reactive power compensation is handed over
Stream side switch (contactor, AC circuit breaker), S2~Sn is the switch for controlling electric capacity C2~Cn to access circuit, and K1~Kn is control
Inductance L1~Ln accesses the switch of circuit, and CPU is the controller of controlling switch S2~Sn, switch K1~Kn adhesives or disconnection.When
When having daytime the power conversion unit of static reactive power compensation normal grid-connected, S is switched, switchs S2~Sm, switch K1~Km adhesives,
Switch Sm+1~Sn, switch Km+1~Kn disconnects, and electric capacity C1, electric capacity C2~Cm are used as the power conversion with static reactive power compensation
The ac filter electric capacity of device, L1~Lm work as the shunt inductance of filter capacitor.
When night there is the power conversion unit of static reactive power compensation not generate electricity by way of merging two or more grid systems, switch S disconnects.CPU breaks first
Switch S2~Sn, switch K1~Kn, the reactive power in detection circuit, the size of the reactive power according to detection is calculated should
The idle amount of compensation, one or more adhesives in controlling switch S2~Sn, switch K1~Kn, until the capacitance compensation for putting into becomes
It is idle that depressor T is lost, and the purpose of electric energy is saved to reach.
Embodiment 8
Power conversion unit topological structure with static reactive power compensation as shown in figure 8, be with the difference of embodiment 2：
In embodiment 8, filter inductance Lg is also serially connected between filter inductance Lm and switch S.
Filter capacitor C2 ' embody in the present embodiment for filter capacitor C2 ..., Cn, switch S1 ' be embodied in the present embodiment
In for switch S2 ..., Sn.
The utility model can be by the electric capacity C grid-connected systems of the power conversion unit LCL filter with static reactive power compensation
In circuit, increase electric capacity C2~Cn as transformer T reactive compensation capacitors, S is the power conversion dress with static reactive power compensation
AC switch (contactor, AC circuit breaker) is put, S2~Sn is the switch for controlling electric capacity C2~Cn to access circuit, and CPU is control
System switch S2~Sn adhesives or the controller of disconnection.Have the power conversion unit of static reactive power compensation normally grid-connected when daytime
When, switch S adhesives, switch S2~Sn disconnect, and the power conversion unit with static reactive power compensation is normally grid-connected.When night inversion
When device does not generate electricity by way of merging two or more grid systems, switch S disconnects.CPU disconnects electric capacity C1~Cn, the reactive power in detection circuit, according to detection first
The size of reactive power calculate the idle amount that should compensate, one or more adhesives in controlling switch S2~Sn, until throwing
It is idle that the capacity compensating transformer T for entering is lost, and the purpose of electric energy is saved to reach.
Embodiment 9
Power conversion unit topological structure with static reactive power compensation as shown in figure 9, be with the difference of embodiment 4：
In embodiment 9, filter inductance Lg is also serially connected between filter inductance Lm and switch S.
Filter capacitor C2 ' embody in the present embodiment for filter capacitor C2 ..., Cn, switch S1 ' be embodied in the present embodiment
In for switch S2 ..., Sn, switch K1 ' embody in the present embodiment for switch K1 ..., Kn, inductance L1 ' is embodied in this reality
Apply in example for switch L1 ..., Ln.
The utility model can be by the electric capacity C grid-connected systems of the power conversion unit LCL filter with static reactive power compensation
In circuit, increase electric capacity C2~Cn, inductance L1~Ln as transformer T reactive compensation capacitors and inductance.S is with static reactive
Power conversion unit AC switch (contactor, AC circuit breaker) of compensation, S2~Sn accesses electricity for control electric capacity C2~Cn
The switch on road, K1~Kn is the switch for controlling inductance L1~Ln to access circuit, and CPU is controlling switch S2~Sn, switchs K1~Kn
Adhesive or the controller of disconnection.When having the power conversion unit of static reactive power compensation normal grid-connected daytime, S adhesives, switch
S2~Sn, switch K1~Kn disconnect, and the power conversion unit with static reactive power compensation is normally grid-connected.
When night there is the power conversion unit of static reactive power compensation not generate electricity by way of merging two or more grid systems, switch S disconnects.CPU breaks first
Switch S2~Sn, switch K1~Kn, the reactive power in detection circuit, the size of the reactive power according to detection is calculated should
The idle amount of compensation, one or more adhesives in controlling switch S2~Sn, switch K1~Kn, until the capacitance compensation for putting into becomes
It is idle that depressor T is lost, and the purpose of electric energy is saved to reach.
Preferred embodiment of the present utility model is the foregoing is only, is not used to limit the utility model, it is all at this
Any modification, equivalent and improvement made within the spirit and principle of utility model etc., should be included in the utility model
Protection domain within.
Claims (10)
1. a kind of power conversion unit with static reactive power compensation, it includes inversion unit, switch S, wave filter, the inversion
Unit passes sequentially through the wave filter, switch S, then is electrically connected to power network by a transformer T；It is characterized in that：It is described
Wave filter includes filter inductance Lm and at least two groups filter capacitor groups, and filter inductance Lm is electrically connected at the inversion unit and opens
Between the S of pass；One of which filter capacitor group includes at least one filter capacitor C1, and one end of filter capacitor C1 is electrically connected at
Between filter inductance Lm and switch S, the other end electrical ground of filter capacitor C1；Wherein another group filter capacitor group is included at least
One filter capacitor C2 ' and at least one filter capacitor C2 ' it is corresponding at least one switch S1 ', and filter capacitor C2 ' one
End is electrically connected between switch S and transformer T via corresponding switch S1 ', the other end electrical ground of filter capacitor C2 '；
When the power conversion unit generates electricity by way of merging two or more grid systems, switch S closures, and the closure quantity for switching S1 ' does not know, but the power becomes
When changing device does not generate electricity by way of merging two or more grid systems, at least one switch S1 ' needs to be closed again immediately after all switches disconnect.
2. there is the power conversion unit of static reactive power compensation as claimed in claim 1, it is characterised in that：All of filtered electrical
Hold the ac filter electric capacity for being the power conversion unit when generating electricity by way of merging two or more grid systems；When the power conversion unit generates electricity by way of merging two or more grid systems, institute
Have switch close, when the power conversion unit does not generate electricity by way of merging two or more grid systems, all switches after disconnecting all switch S1 ' close again immediately
Close.
3. there is the power conversion unit of static reactive power compensation as claimed in claim 1, it is characterised in that：Filter capacitor C2 '
Quantity for two and more than, the quantity of corresponding switch S1 ' also for two and more than；All of filter capacitor is the power
Ac filter electric capacity when converting means generates electricity by way of merging two or more grid systems；When generating electricity by way of merging two or more grid systems, all switches are closed the power conversion unit,
When the power conversion unit does not generate electricity by way of merging two or more grid systems, after all switches disconnect, at least one switch S1 ' is closed again immediately.
4. there is the power conversion unit of static reactive power compensation as claimed in claim 1, it is characterised in that：Filter capacitor C2 '
Quantity for two and more than, the quantity of corresponding switch S1 ' also for two and more than；All filter capacitor C1 are plus a part
Filter capacitor C2 ' is ac filter electric capacity of the power conversion unit when generating electricity by way of merging two or more grid systems；The power conversion unit is grid-connected
During generating, S closures are not only switched, and also closed with as the corresponding switch S1 ' of ac filter electric capacity, the power becomes
When changing device does not generate electricity by way of merging two or more grid systems, after all switches disconnect, at least one switch S1 ' is closed again immediately.
5. there is the power conversion unit of static reactive power compensation as claimed in claim 1, it is characterised in that：Wherein another group filter
Ripple capacitance group also includes at least one corresponding switch K1 ' of at least one inductance L1 ' and at least one inductance L1 '；Each electricity
The one end for feeling L1 ' is electrically connected between switch S and transformer T via corresponding switch K1 ', the other end of each inductance L1 '
Electrical ground；All of filter capacitor is ac filter electric capacity of the power conversion unit when generating electricity by way of merging two or more grid systems；The power
When converting means generates electricity by way of merging two or more grid systems, switch S and all switch S1 ' is closed, and when the power conversion unit does not generate electricity by way of merging two or more grid systems, is owned
At least one switch S1 ' and/or at least one switch K1 ' is closed again immediately after switch disconnects.
6. there is the power conversion unit of static reactive power compensation as claimed in claim 1, it is characterised in that：Wherein another group filter
Ripple capacitance group also includes at least one corresponding switch K1 ' of at least one inductance L1 ' and at least one inductance L1 '；Each electricity
The one end for feeling L1 ' is electrically connected between switch S and transformer T via corresponding switch K1 ', the other end of each inductance L1 '
Electrical ground；The quantity of filter capacitor C2 ' be two and more than, the quantity of corresponding switch S1 ' also for two and more than；It is all
Filter capacitor C1 is ac filter electric capacity of the power conversion unit when generating electricity by way of merging two or more grid systems plus a part of filter capacitor C2 '；
When the power conversion unit generates electricity by way of merging two or more grid systems, not only switch S closures, and with as the corresponding switch of ac filter electric capacity
S1 ' is also closed, when the power conversion unit does not generate electricity by way of merging two or more grid systems, after all switches disconnect, at least one switch S1 ' and/
Or at least one switch K1 ' be closed again immediately.
7. there is the power conversion unit of static reactive power compensation as claimed in claim 1, it is characterised in that：Wherein another group filter
Ripple capacitance group also includes at least one corresponding switch K1 ' of at least one inductance L1 ' and at least one inductance L1 '；Each electricity
The one end for feeling L1 ' is electrically connected between switch S and transformer T via corresponding switch K1 ', the other end of each inductance L1 '
Electrical ground；The quantity of filter capacitor C2 ' be two and more than, the quantity of corresponding switch S1 ' also for two and more than；It is all
Filter capacitor is ac filter electric capacity of the power conversion unit when generating electricity by way of merging two or more grid systems plus a part of inductance L1 '；The work(
When rate converting means generates electricity by way of merging two or more grid systems, not only switch S closures, and with as the corresponding switch S1 ' of ac filter electric capacity and/or
Switch K1 ' is also closed, when the power conversion unit does not generate electricity by way of merging two or more grid systems, after all switches disconnect, and at least one switch S1 '
And/or at least one switch K1 ' be closed again immediately.
8. there is the power conversion unit of static reactive power compensation as claimed in claim 1, it is characterised in that：Wherein another group filter
Ripple capacitance group also includes at least two corresponding switch K1 ' of at least two inductance L1 ' and at least two inductance L1 '；Each electricity
The one end for feeling L1 ' is electrically connected between switch S and transformer T via corresponding switch K1 ', the other end of each inductance L1 '
Electrical ground；The quantity of filter capacitor C2 ' be two and more than, the quantity of corresponding switch S1 ' also for two and more than；It is all
Filter capacitor C1 is together the power conversion unit along with a part of inductance L1 ' plus a part of filter capacitor C2 ' simultaneously
Ac filter electric capacity when net generates electricity；When the power conversion unit generates electricity by way of merging two or more grid systems, not only switch S closure, and with as friendship
The corresponding switch S1 ' of stream filter capacitor and switch K1 ' are also closed, and when the power conversion unit does not generate electricity by way of merging two or more grid systems, are owned
After switch disconnects, at least one switch S1 ' and/or at least one switch K1 ' are closed again immediately.
9. there is the power conversion unit of static reactive power compensation as claimed in claim 1, it is characterised in that：All switches are all
Electronic switch, the power conversion unit controls the adhesive or disconnection of these electronic switches by a control unit.
10. there is the power conversion unit of static reactive power compensation as in one of claimed in any of claims 1 to 9, its feature exists
In：Filter inductance Lg is also serially connected between filter inductance Lm and switch S.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201621405031.6U CN206250774U (en) | 2016-12-21 | 2016-12-21 | A kind of power conversion unit with static reactive power compensation |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621405031.6U CN206250774U (en) | 2016-12-21 | 2016-12-21 | A kind of power conversion unit with static reactive power compensation |
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| CN206250774U true CN206250774U (en) | 2017-06-13 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110148949A (en) * | 2019-05-08 | 2019-08-20 | 浙江芯能光伏科技股份有限公司 | Roof photovoltaic power station string type inverter night idle inhibition control device |
-
2016
- 2016-12-21 CN CN201621405031.6U patent/CN206250774U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110148949A (en) * | 2019-05-08 | 2019-08-20 | 浙江芯能光伏科技股份有限公司 | Roof photovoltaic power station string type inverter night idle inhibition control device |
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