CN105490307B - Mesohigh grid-connected system, mesohigh grid-connected system and its control unit - Google Patents
Mesohigh grid-connected system, mesohigh grid-connected system and its control unit Download PDFInfo
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- CN105490307B CN105490307B CN201610084366.0A CN201610084366A CN105490307B CN 105490307 B CN105490307 B CN 105490307B CN 201610084366 A CN201610084366 A CN 201610084366A CN 105490307 B CN105490307 B CN 105490307B
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
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Abstract
The present invention provides a kind of mesohigh grid-connected system, mesohigh grid-connected system and its control unit, pass through control unit, realize the collection to the voltage of the mesohigh power network, and after power network amplitude and grid phase synchronizing signal is obtained, sent by connection to inversion unit, the problem of not only increasing the isolation performance of system, avoid potential safety hazard, while avoiding wiring complexity in the prior art.
Description
Technical field
The present invention relates to technical field of generating electricity by way of merging two or more grid systems, more particularly to a kind of mesohigh grid-connected system, mesohigh are grid-connected
System and its control unit.
Background technology
For large-sized photovoltaic power station or distributed grid-connected electricity generation system, inversion system carries out photovoltaic array DC energy inverse
Mesohigh power network is fed to by step-up transformer again after change.Conventional photovoltaic grid-connected system, in the light such as night or rainy days
According to it is faint when, only inversion system is in holding state, and step-up transformer is connected with mesohigh power network always, is so treated in system
Step-up transformer will produce open circuit loss during machine.
In order to reduce the power attenuation of whole electricity generation system, a kind of mesohigh interconnection technology in the prior art be present, will rise
A part of the pressure transformer as inversion system, the output end of step-up transformer pass through high voltage connector or shunting switch and middle height
Voltage electric grid is connected, and high voltage connector or shunting switch are controlled by the controllable of inversion system, and then realize mesohigh power network
Input and excision：The connection of step-up transformer and mesohigh power network is cut off when grid-connected system is standby, so as to reduce boosting transformation
Device open circuit loss, improve system whole efficiency；And before mesohigh power network input, first pass through the inversion unit direct current of inversion system
Side energy carries out excitation to step-up transformer, establishes and voltage of the mesohigh power network with width with phase, reduction power network put into moment pair
The impact of step-up transformer and high tension apparatus, improve the service life of key.
But inversion system of the prior art needs to gather the output voltage of step-up transformer by three connecting lines,
The voltage of mesohigh power network is gathered by other three connecting lines again, treats that the voltage of high voltage connector or shunting switch both sides is consistent
When, namely after excitation success, then by controlling high voltage connector or shunting switch to close, complete power network input.System needs six
Root connecting line gathers the voltage of high voltage connector or shunting switch both sides so that system wiring is complicated.Further, since contravariant system
System introduces the sampling of mesohigh power network, reduces the isolation performance of system, potential safety hazard be present.
The content of the invention
The present invention provides a kind of mesohigh grid-connected system, mesohigh grid-connected system and its control unit, existing to solve
There is wiring complexity in technology and the problem of potential safety hazard be present.
To realize the purpose, the technical scheme that the application provides is as follows：
A kind of control unit of mesohigh grid-connected system, applied to mesohigh grid-connected system, the mesohigh grid-connected system
Including：The control unit of at least one inversion unit and the mesohigh grid-connected system；Wherein：
The first end of the control unit of the mesohigh grid-connected system is connected by connection with the inversion unit, described
Second end of the control unit of mesohigh grid-connected system is connected with the control terminal that division switchs, the control of the mesohigh grid-connected system
The tie point that 3rd end of unit processed switchs with transformer and the division is connected, the control unit of the mesohigh grid-connected system
The 4th end be connected with the tie point of the division switch and mesohigh power network；
The control unit of the mesohigh grid-connected system is used for：
When the division switchs separating brake, gather and power network amplitude and power network are obtained according to the voltage of the mesohigh power network
Phase synchronized signal, the power network amplitude and the grid phase synchronizing signal are sent to the inversion by the connection
Unit, the inversion unit is set to be encouraged according to the power network amplitude and the grid phase synchronizing signal the transformer
Magnetic, and send to close a floodgate after excitation success and order to the control unit of the mesohigh grid-connected system；Further according to the life of closing a floodgate
Order controls division switch to close a floodgate, and sends the status signal of the division switch in real time to the inversion unit；
When the division switchs combined floodgate and meets system standby condition, according to the separating brake order of inversion unit transmission
Control the division switch separating brake.
Preferably, the control unit of the mesohigh grid-connected system includes：
Receiving module, for when the division switchs separating brake, gathering the voltage of the mesohigh power network, and according to described
The voltage of mesohigh power network obtains the power network amplitude and the grid phase synchronizing signal；
Synchronization module, for the power network amplitude to be sent to the inversion unit, and by described in by the connection
Grid phase synchronizing signal is periodically sent to the inversion unit by the connection；
Drive module, for controlling the division switch to close a floodgate according to the order of closing a floodgate；Or switched in the division
When closing a floodgate and meeting system standby condition, the division is controlled to switch separating brake according to the separating brake order；
Feedback module, for when the division is switched and closed a floodgate, sending the status signal of division switch in real time to institute
State inversion unit.
Preferably, the synchronization module performs and periodically sends out the grid phase synchronizing signal by the connection
When delivering to the inversion unit, it is specifically used for：
When the phase of the power network meets θTp=θmDuring ± Δ θ, the grid phase synchronizing signal T is sentpIt is extremely described inverse
Become unit；
Wherein, θTpFor the phase of the power network, θmFor default fixed phase, and 0≤θm≤2π；Δ θ allows to be default
Error.
Preferably, the control unit of the mesohigh grid-connected system is additionally operable to：The temperature of the division switch is sent in real time
And/or monitoring signal is to the inversion unit.
A kind of mesohigh grid-connected system, is connected with dc source and mesohigh power network, and the mesohigh grid-connected system includes：
At least one inversion unit and control unit；Wherein：
The DC terminal of the inversion unit is connected with the dc source, the exchange end of the inversion unit and transformer
Low-pressure side is connected, and the high-pressure side of the transformer is switched by division to be connected with the mesohigh power network, and the transformer is used for
The low voltage transition that the inversion unit is exported is mesohigh voltage；The inversion unit is used to switch separating brake in the division
When, excitation is carried out to the transformer according to power network amplitude and grid phase synchronizing signal, and send and close a floodgate after excitation success
Order to described control unit；And the inversion unit is used to, when the division is switched and closed a floodgate, receive the division switch
Status signal, parallel network reverse is carried out when meeting grid-connected conditions, when meeting system standby condition, send separating brake order to described
Control unit；
The first end of described control unit is connected by connection with the inversion unit, the second end of described control unit
It is connected with the control terminal of division switch, the 3rd end of described control unit and the company of the transformer and division switch
Contact is connected, and the 4th end of described control unit is connected with the tie point of the division switch and mesohigh power network；The control
Unit is used for：When the division switchs separating brake, gather and the power network amplitude is obtained according to the voltage of the mesohigh power network
With the grid phase synchronizing signal, the power network amplitude and the grid phase synchronizing signal are sent by the connection
To the inversion unit；Control the division switch to close a floodgate further according to the order of closing a floodgate, send the division switch in real time
Status signal is to the inversion unit；When the division switchs combined floodgate and meets system standby condition, ordered according to the separating brake
Order controls the division switch separating brake.
Preferably, described control unit includes：
Receiving module, for when the division switchs separating brake, gathering the voltage of the mesohigh power network, and according to described
The voltage of mesohigh power network obtains the power network amplitude and the grid phase synchronizing signal；
Synchronization module, for the power network amplitude to be sent to the inversion unit, and by described in by the connection
Grid phase synchronizing signal is periodically sent to the inversion unit by the connection；
Drive module, for controlling the division switch to close a floodgate according to the order of closing a floodgate；Or switched in the division
When closing a floodgate and meeting system standby condition, the division is controlled to switch separating brake according to the separating brake order；
Feedback module, for when the division is switched and closed a floodgate, sending the status signal of division switch in real time to institute
State inversion unit.
Preferably, the synchronization module performs and periodically sends out the grid phase synchronizing signal by the connection
When delivering to the inversion unit, it is specifically used for：
When the phase of the power network meets θTp=θmDuring ± Δ θ, the grid phase synchronizing signal T is sentpIt is extremely described inverse
Become unit；
Wherein, θTpFor the phase of the power network, θmFor default fixed phase, and 0≤θm≤2π；Δ θ allows to be default
Error.
Preferably, the division switch is high voltage connector or high-voltage tap changer.
Preferably, the transformer is double transformer with split windings either two-winding transformer or box-type substation；
Described control unit and division switch are integrated in the box-type substation, or described control unit and institute
State division switch and be integrated in the box-type substation and described between high-voltage fence.
A kind of mesohigh grid-connected system, including the mesohigh described in dc source, transformer and any of the above-described
Grid-connected system.
The control unit of mesohigh grid-connected system provided by the invention, when division switchs separating brake, gather and high in
The voltage of voltage electric grid obtains power network amplitude and grid phase synchronizing signal, and the power network amplitude and the grid phase are synchronously believed
Number sent by connection to inversion unit；Synchronously believed according to the power network amplitude and the grid phase for the inversion unit
Number to transformer carry out excitation, and excitation success after send close a floodgate order to the mesohigh grid-connected system control unit；
Control the division switch to close a floodgate further according to the order of closing a floodgate, and send the status signal of the division switch in real time；Institute
When stating division switch combined floodgate, the separating brake order sent according to the inversion unit controls the division to switch separating brake；It is final to realize
Input and excision for the mesohigh power network；The control unit of mesohigh grid-connected system of the present invention, realization pair
The collection of the voltage of the mesohigh power network, and after the power network amplitude and the grid phase synchronizing signal is obtained, pass through
Connection sends the isolation performance for the inversion unit, not only increasing system, avoids potential safety hazard, while avoids existing
There is the problem of wiring complexity in technology.
Brief description of the drawings
In order to illustrate more clearly about the embodiment of the present invention or technical scheme of the prior art, below will be to embodiment or existing
There is the required accompanying drawing used in technology description to be briefly described, it should be apparent that, drawings in the following description are only this
Some embodiments of invention, for those of ordinary skill in the art, on the premise of not paying creative work, can be with
Other accompanying drawings are obtained according to these accompanying drawings.
Fig. 1 is the structural representation of mesohigh grid-connected system provided in an embodiment of the present invention；
Fig. 2 is the structural representation for the control unit that another embodiment of the present invention provides；
Fig. 3 is the signal waveform schematic diagram that another embodiment of the present invention provides.
Embodiment
In order to facilitate the understanding of the purposes, features and advantages of the present invention, below in conjunction with the accompanying drawings to the present invention
Embodiment be described in detail.
The present invention provides a kind of control unit of mesohigh grid-connected system, to solve the complexity of wiring in the prior art and exist
The problem of potential safety hazard.
Specifically, as shown in figure 1, the control unit 103 of mesohigh grid-connected system, applied to the grid-connected system of the mesohigh
System, the mesohigh grid-connected system include：The control unit 103 of at least one inversion unit 101 and mesohigh grid-connected system；Its
In：
The first end of the control unit 103 of mesohigh grid-connected system passes through connection (as shown in phantom in Figure 1) and inversion
Unit 101 is connected, and the second end of the control unit 103 of mesohigh grid-connected system is connected with the control terminal of division switch 104, middle height
The 3rd end of the control unit 103 of grid-connected system is pressed to be connected with the tie point of transformer 102 and division switch 104, mesohigh is simultaneously
4th end of the control unit 103 of net system is connected with the tie point of division switch 104 and mesohigh power network；
Specifically operation principle is：
The control unit 103 of the mesohigh grid-connected system gathers and according to the middle height when division switchs 104 separating brake
The voltage of voltage electric grid obtains the power network amplitude and the grid phase synchronizing signal, by the power network amplitude and the power network phase
Bit synchronization signal is sent to inversion unit 101 by the connection, makes inversion unit 101 according to the power network amplitude and described
Grid phase synchronizing signal carries out excitation to the transformer, and sends to close a floodgate after excitation success and order to the mesohigh simultaneously
The control unit 103 of net system；And closed a floodgate according to the order control division switch 104 that closes a floodgate, division switch 104 is sent in real time
Status signal to inversion unit 101；When division switch 104 closes a floodgate and meets system standby condition, according to inversion unit 101
The separating brake order control division of transmission switchs 104 separating brakes.
In specific practical application, the control unit 103 of mesohigh grid-connected system can be arranged at mesohigh side, and each
Individual inversion unit 101 can be arranged at inversion room 100, as shown in figure 1, being only herein still a kind of example, might not limit
In this, in the protection domain of the application.
The control unit 103 of mesohigh grid-connected system described in the present embodiment, realize the voltage to the mesohigh power network
Collection, and after the power network amplitude and the grid phase synchronizing signal is obtained, sent by connection to inversion unit
101, the isolation performance of system is not only increased, avoids potential safety hazard, while avoids asking for the complexity of wiring in the prior art
Topic.
Further, as shown in Fig. 2 the control unit of the mesohigh grid-connected system includes：
Receiving module 301, synchronization module 302, drive module 303 and feedback module 304.
Wherein, receiving module 301 is used for the voltage for when division switchs 104 separating brake, gathering the mesohigh power network, and root
The power network amplitude and the grid phase synchronizing signal are obtained according to the voltage of the mesohigh power network；
Synchronization module 302 is used to by the connection send the power network amplitude to inversion unit 101, and by described in
Grid phase synchronizing signal is periodically sent to inversion unit 101 by the connection；
Drive module 303 is used to be closed a floodgate according to the order control division switch 104 that closes a floodgate；Or switch 104 in division
When closing a floodgate and meeting system standby condition, division is controlled to switch 104 separating brakes according to the separating brake order；
Feedback module 304 is used to, when division switch 104 closes a floodgate, send the status signal of division switch 104 in real time to inverse
Become unit 101.
Preferably, synchronization module 302, which performs, periodically sends out the grid phase synchronizing signal by the connection
When delivering to inversion unit 101, it is specifically used for：
When the phase of the power network meets θTp=θmDuring ± Δ θ, the grid phase synchronizing signal T is sentpTo inversion list
Member 101；
Wherein, θTpFor the phase of the power network, θmFor default fixed phase, and 0≤θm≤2π；Δ θ allows to be default
Error.
The phase theta of the power networkTpWith default fixed phase θmAnd the grid phase synchronizing signal TpRelation see Fig. 3
It is shown.
In order to avoid the inversion unit directly gathers the voltage of the mesohigh power network, the present embodiment provide it is described in
The control unit of high pressure grid-connected system, the power network amplitude and the grid phase synchronizing signal can be obtained, and to described inverse
Become unit and send synchronizing signal (the grid phase synchronizing signal Tp), the inversion unit can be completed according to the synchronizing signal
Mesohigh power network the phase-locked function.
Preferably, the control unit of the mesohigh grid-connected system is additionally operable to：The temperature of the division switch is sent in real time
And/or monitoring signal is to the inversion unit.
The control unit of the mesohigh grid-connected system send in real time division switch temperature and/or monitoring signal extremely
The inversion unit, the information for needing to monitor is provided for the inversion unit, ensure that the safety of the mesohigh grid-connected system
Operation.
Another embodiment of the present invention additionally provides a kind of mesohigh grid-connected system, as shown in figure 1, the grid-connected system of the mesohigh
System includes：At least one inversion unit 101 and control unit 103；Wherein：
The DC terminal of inversion unit 101 is connected with dc source, and the exchange end of inversion unit 101 is low with transformer 102
Pressure side is connected；The high-pressure side of transformer 102 is connected by division switch 104 with mesohigh power network；
The first end of control unit 103 is connected by connection (as shown in phantom in Figure 1) with inversion unit 101, control
Second end of unit 103 is connected with the control terminal of division switch 104, the 3rd end and transformer 102 and the division of control unit 103
The tie point of switch 104 is connected, and the 4th end of control unit 103 is connected with the tie point of division switch 104 and mesohigh power network.
In specific practical application, transformer 102 can be step-up transformer or box-type substation, do not do and have herein
Body limits, in the protection domain of the application.
Specifically operation principle is：
Inversion unit 101 is used for when division switchs 104 separating brake, according to power network amplitude and grid phase synchronizing signal to becoming
Depressor 102 carries out excitation, and sends to close a floodgate after excitation success and order to control unit 103；When division switch 104 closes a floodgate,
The status signal of division switch 104 is received, parallel network reverse is carried out when meeting grid-connected conditions, when meeting system standby condition,
Separating brake order is sent to control unit 103；The low voltage transition that transformer 102 is used to export inversion unit 101 is mesohigh
Voltage；
Control unit 103 is used to, when division switchs 104 separating brake, gather and be obtained according to the voltage of the mesohigh power network
The power network amplitude and the grid phase synchronizing signal, the power network amplitude and the grid phase synchronizing signal are passed through into institute
Connection is stated to send to inversion unit 101；Control division switch 104 is ordered to close a floodgate further according to described close a floodgate, in real time described in transmission
The status signal of division switch is to inversion unit 101；When division switch 104 closes a floodgate and meets system standby condition, according to institute
State separating brake order control division and switch 104 separating brakes.
In specific practical application, the dc source can be made up of series photovoltaic component, and according to inversion unit
Capacity it is different, the configuration of photovoltaic array also will be otherwise varied；For centralized grid-connected inverting system, the dc source may be used also
With the link such as conflux including direct current, it is not specifically limited herein.
Specifically, gathered and according to the electricity of mesohigh power network by control unit 103 when division switchs 104 separating brake first
Pressure obtains power network amplitude and grid phase synchronizing signal, and the power network amplitude and the grid phase synchronizing signal are passed through into communication
Line is sent to inversion unit 101；Again by inversion unit 101 according to the power network amplitude and the grid phase synchronizing signal to becoming
Depressor carries out excitation, and sends to close a floodgate after excitation success and order to control unit 103；Then by control unit 103 according to institute
State combined floodgate order control division switch 104 to close a floodgate, and send the status signal of division switch 104 in real time to inversion unit 101；
When division switch 104 closes a floodgate, inversion unit 101 receives the status signal of division switch 104, when meeting grid-connected conditions, carries out
Parallel network reverse, and when meeting system standby condition, separating brake order is sent to control unit 103, controlled point by control unit 103
The separating brake of combination switch 104；Final input and the excision realized for the mesohigh power network, boosting inverter can be disconnected at night
The connection of device and power network, reduce the open circuit loss of night transformer 102, there is provided system effectiveness.
Mesohigh grid-connected system described in the present embodiment, by control unit 103, realize the electricity to the mesohigh power network
The collection of pressure, and after the power network amplitude and the grid phase synchronizing signal is obtained, sent by connection to inversion list
Member 101, not only increases the isolation performance of system, avoids potential safety hazard, while avoids the complexity of wiring in the prior art
Problem.
Further, as shown in Fig. 2 described control unit includes：
Receiving module 301, synchronization module 302, drive module 303 and feedback module 304.
Preferably, synchronization module 302, which performs, periodically sends out the grid phase synchronizing signal by the connection
When delivering to inversion unit 101, it is specifically used for：
When the phase of the power network meets θTp=θmDuring ± Δ θ, the grid phase synchronizing signal T is sentpTo inversion list
Member 101；
Wherein, θTpFor the phase of the power network, θmFor default fixed phase, and 0≤θm≤2π；Δ θ allows to be default
Error.
Preferably, the control unit of the mesohigh grid-connected system is additionally operable to：The temperature of the division switch is sent in real time
And/or monitoring signal is to the inversion unit.
Specific operation principle is same as the previously described embodiments, and here is omitted.
In addition, in specific practical application：
Optionally, the division switch is high voltage connector or high-voltage tap changer.
Optionally, the transformer is double transformer with split winding or two-winding transformer；
Or the transformer is box-type substation；The control unit of the mesohigh grid-connected system and the division are opened
Pass is integrated in the box-type substation, or the control unit of the mesohigh grid-connected system and division switch are integrated in
The box-type substation and described between high-voltage fence.
In specific practical application, the selection of the division switch and the transformer can be according to its concrete application ring
Depending on border, it is not specifically limited herein, in the protection domain of the application.
Another embodiment of the present invention additionally provides a kind of mesohigh grid-connected system, including：Dc source, transformer
102 and any of the above-described embodiment described in mesohigh grid-connected system；Wherein：
The mesohigh grid-connected system as shown in figure 1, including：At least one inversion unit 101 and control unit 103；Its
In：
The DC terminal of inversion unit 101 is connected with dc source, and the exchange end of inversion unit 101 is low with transformer 102
Pressure side is connected；The high-pressure side of transformer 102 is connected by division switch 104 with mesohigh power network；
The first end of control unit 103 is connected by connection (as shown in phantom in Figure 1) with inversion unit 101, control
Second end of unit 103 is connected with the control terminal of division switch 104, the 3rd end and transformer 102 and the division of control unit 103
The tie point of switch 104 is connected, and the 4th end of control unit 103 is connected with the tie point of division switch 104 and mesohigh power network.
Mesohigh grid-connected system described in the present embodiment, by control unit 103, realize to the mesohigh power network
Voltage collection, and after the power network amplitude and the grid phase synchronizing signal is obtained, sent by connection to inverse
Become unit 101, not only increase the isolation performance of system, avoid potential safety hazard, while avoid wiring in the prior art and answer
The problem of miscellaneous.
Further, as shown in Fig. 2 described control unit includes：
Receiving module 301, synchronization module 302, drive module 303 and feedback module 304.
Preferably, synchronization module 302, which performs, periodically sends out the grid phase synchronizing signal by the connection
When delivering to inversion unit 101, it is specifically used for：
When the phase of the power network meets θTp=θmDuring ± Δ θ, the grid phase synchronizing signal T is sentpTo inversion list
Member 101；
Wherein, θTpFor the phase of the power network, θmFor default fixed phase, and 0≤θm≤2π；Δ θ allows to be default
Error.
Preferably, the control unit of the mesohigh grid-connected system is additionally operable to：The temperature of the division switch is sent in real time
And/or monitoring signal is to the inversion unit.
Optionally, the division switch is high voltage connector or high-voltage tap changer.
Optionally, the transformer is double transformer with split winding or two-winding transformer；
Or the transformer is box-type substation；The control unit of the mesohigh grid-connected system and the division are opened
Pass is integrated in the box-type substation, or the control unit of the mesohigh grid-connected system and division switch are integrated in
The box-type substation and described between high-voltage fence.
Specific operation principle is same as the previously described embodiments, and here is omitted.
The above described is only a preferred embodiment of the present invention, any formal limitation not is made to the present invention.Though
So the present invention is disclosed above with preferred embodiment, but is not limited to the present invention.It is any to be familiar with those skilled in the art
Member, without departing from the scope of the technical proposal of the invention, all using the methods and technical content of the disclosure above to the present invention
Technical scheme makes many possible changes and modifications, or is revised as the equivalent embodiment of equivalent variations.Therefore, it is every without departing from
The content of technical solution of the present invention, the technical spirit according to the present invention is to any simple modification made for any of the above embodiments, equivalent
Change and modification, still fall within technical solution of the present invention protection in the range of.
Claims (10)
- A kind of 1. control unit of mesohigh grid-connected system, it is characterised in that applied to mesohigh grid-connected system, the mesohigh Grid-connected system includes：At least one inversion unit for being arranged at inversion room and the control unit for being arranged at mesohigh side；Wherein：The first end of the control unit of the mesohigh grid-connected system is connected by connection with the inversion unit, the middle height The second end of the control unit of grid-connected system is pressed to be connected with the control terminal that division switchs, the control list of the mesohigh grid-connected system The tie point of the 3rd end and the transformer of member and division switch is connected, and the of the control unit of the mesohigh grid-connected system Four ends are connected with the tie point of the division switch and mesohigh power network；The control unit of the mesohigh grid-connected system is used for：When the division switchs separating brake, gather and power network amplitude and grid phase are obtained according to the voltage of the mesohigh power network Synchronizing signal, the power network amplitude and the grid phase synchronizing signal are sent to the inversion list by the connection Member, the inversion unit is set to carry out excitation to the transformer according to the power network amplitude and the grid phase synchronizing signal, And send to close a floodgate after excitation success and order to the control unit of the mesohigh grid-connected system；Further according to the order control of closing a floodgate Make division switch to close a floodgate, send the status signal of the division switch in real time to the inversion unit；When the division switchs combined floodgate and meets system standby condition, the separating brake order sent according to the inversion unit controls The division switchs separating brake.
- 2. the control unit of mesohigh grid-connected system according to claim 1, it is characterised in that the grid-connected system of mesohigh The control unit of system includes：Receiving module, for when the division switchs separating brake, gathering the voltage of the mesohigh power network, and according to the middle height The voltage of voltage electric grid obtains the power network amplitude and the grid phase synchronizing signal；Synchronization module, for the power network amplitude to be sent to the inversion unit by the connection, and by the power network Phase synchronized signal is periodically sent to the inversion unit by the connection；Drive module, for controlling the division switch to close a floodgate according to the order of closing a floodgate；Or switch and close a floodgate in the division And when meeting system standby condition, the division is controlled to switch separating brake according to the separating brake order；Feedback module, for when the division is switched and closed a floodgate, sending the status signal of division switch in real time to described inverse Become unit.
- 3. the control unit of mesohigh grid-connected system according to claim 2, it is characterised in that the synchronization module performs When the grid phase synchronizing signal is periodically sent to the inversion unit by the connection, it is specifically used for：When the phase of the power network meets θTp=θmDuring ± Δ θ, the grid phase synchronizing signal T is sentpTo the inversion list Member；Wherein, θTpFor the phase of the power network, θmFor default fixed phase, and 0≤θm≤2π；Δ θ is default allowable error.
- 4. the control unit of mesohigh grid-connected system according to any one of claims 1 to 3, it is characterised in that the middle height The control unit of pressure grid-connected system is additionally operable to：Send in real time division switch temperature and/or monitoring signal to the inversion Unit.
- 5. a kind of mesohigh grid-connected system, it is characterised in that be connected with dc source and mesohigh power network, the mesohigh is grid-connected System includes：At least one inversion unit for being arranged at inversion room and the control unit for being arranged at mesohigh side；Wherein：The DC terminal of the inversion unit is connected with the dc source, the exchange end of the inversion unit and the low pressure of transformer Side is connected, and the high-pressure side of the transformer is switched by division to be connected with the mesohigh power network, and the transformer is used for institute The low voltage transition for stating inversion unit output is mesohigh voltage；The inversion unit is used for when the division switchs separating brake, Excitation is carried out to the transformer according to power network amplitude and grid phase synchronizing signal, and order of closing a floodgate is sent after excitation success To described control unit；And the inversion unit is used to, when the division is switched and closed a floodgate, receive the state that the division switchs Signal, parallel network reverse is carried out when meeting grid-connected conditions, when meeting system standby condition, send separating brake order to the control Unit；The first end of described control unit is connected by connection with the inversion unit, the second end of described control unit and institute The control terminal for stating division switch is connected, the 3rd end and the transformer and the tie point of division switch of described control unit It is connected, the 4th end of described control unit is connected with the tie point of the division switch and mesohigh power network；Described control unit For：When the division switchs separating brake, gather and the power network amplitude and institute are obtained according to the voltage of the mesohigh power network Grid phase synchronizing signal is stated, the power network amplitude and the grid phase synchronizing signal are sent to institute by the connection State inversion unit；Control the division switch to close a floodgate further according to the order of closing a floodgate, send the state of the division switch in real time Signal is to the inversion unit；When the division switchs combined floodgate and meets system standby condition, according to the separating brake order control Make the division switch separating brake.
- 6. mesohigh grid-connected system according to claim 5, it is characterised in that described control unit includes：Receiving module, for when the division switchs separating brake, gathering the voltage of the mesohigh power network, and according to the middle height The voltage of voltage electric grid obtains the power network amplitude and the grid phase synchronizing signal；Synchronization module, for the power network amplitude to be sent to the inversion unit by the connection, and by the power network Phase synchronized signal is periodically sent to the inversion unit by the connection；Drive module, for controlling the division switch to close a floodgate according to the order of closing a floodgate；Or switch and close a floodgate in the division And when meeting system standby condition, the division is controlled to switch separating brake according to the separating brake order；Feedback module, for when the division is switched and closed a floodgate, sending the status signal of division switch in real time to described inverse Become unit.
- 7. mesohigh grid-connected system according to claim 6, it is characterised in that the synchronization module is performed the power network When phase synchronized signal is periodically sent to the inversion unit by the connection, it is specifically used for：When the phase of the power network meets θTp=θmDuring ± Δ θ, the grid phase synchronizing signal T is sentpTo the inversion list Member；Wherein, θTpFor the phase of the power network, θmFor default fixed phase, and 0≤θm≤2π；Δ θ is default allowable error.
- 8. according to any described mesohigh grid-connected system of claim 5 to 7, it is characterised in that the division switch is high pressure Contactor or high-voltage tap changer.
- 9. according to any described mesohigh grid-connected system of claim 5 to 7, it is characterised in that the transformer is double divisions Transformer either two-winding transformer or box-type substation；Described control unit and division switch are integrated in the box-type substation, or described control unit and described point Combination switch is integrated between the box-type substation and the mesohigh power network.
- 10. a kind of mesohigh grid-connected system, it is characterised in that including dc source, transformer and claim 5 to 9 Mesohigh grid-connected system described in any one.
Priority Applications (4)
| Application Number | Priority Date | Filing Date | Title |
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| CN201610084366.0A CN105490307B (en) | 2016-02-05 | 2016-02-05 | Mesohigh grid-connected system, mesohigh grid-connected system and its control unit |
| ES17153024T ES2839500T3 (en) | 2016-02-05 | 2017-01-25 | Power generation system connected to medium and high voltage network, system connected to medium and high voltage network |
| EP17153024.9A EP3203598B1 (en) | 2016-02-05 | 2017-01-25 | Medium and high voltage grid-connected power generation system, medium and high voltage grid-connected system |
| US15/415,509 US10103544B2 (en) | 2016-02-05 | 2017-01-25 | Medium and high voltage grid-connected power generation system, medium and high voltage grid-connected system and control unit thereof |
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| CN201610084366.0A CN105490307B (en) | 2016-02-05 | 2016-02-05 | Mesohigh grid-connected system, mesohigh grid-connected system and its control unit |
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| CN106159997A (en) * | 2016-07-13 | 2016-11-23 | 上能电气股份有限公司 | The control method of eliminating transformer open circuit loss in a kind of photovoltaic system |
| CN109524997A (en) * | 2018-11-16 | 2019-03-26 | 国家电网有限公司 | A method of preventing water power station control system relay tip malfunction |
| CN110429654B (en) * | 2019-08-29 | 2021-01-22 | 浙江正泰新能源开发有限公司 | Control method and system for booster transformer of photovoltaic power station and related components |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101621206A (en) * | 2009-08-13 | 2010-01-06 | 合肥阳光电源有限公司 | Combination method of photovoltaic combination inverter containing transformer at AC side |
| CN103812134A (en) * | 2014-02-20 | 2014-05-21 | 新疆希望电子有限公司 | Suppression method and system for exciting current of inverter and power grid connection momentary transformer |
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| JPH06276688A (en) * | 1993-03-22 | 1994-09-30 | Nishishiba Electric Co Ltd | Power generation system based on induction generator |
| JP2004074209A (en) * | 2002-08-15 | 2004-03-11 | Kohei Muramoto | Multiple press transfer apparatus |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101621206A (en) * | 2009-08-13 | 2010-01-06 | 合肥阳光电源有限公司 | Combination method of photovoltaic combination inverter containing transformer at AC side |
| CN103812134A (en) * | 2014-02-20 | 2014-05-21 | 新疆希望电子有限公司 | Suppression method and system for exciting current of inverter and power grid connection momentary transformer |
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