CN209675953U - Change of current grid-connecting apparatus and system for grid-connected photovoltaic power generation station - Google Patents
Change of current grid-connecting apparatus and system for grid-connected photovoltaic power generation station Download PDFInfo
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- CN209675953U CN209675953U CN201920791858.2U CN201920791858U CN209675953U CN 209675953 U CN209675953 U CN 209675953U CN 201920791858 U CN201920791858 U CN 201920791858U CN 209675953 U CN209675953 U CN 209675953U
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Abstract
The utility model relates to solar power generation control technology fields; in particular to a kind of change of current grid-connecting apparatus for grid-connected photovoltaic power generation station; including current transforming unit; the current transforming unit includes over-voltage protector, capacitor, inductance and bridge circuit; the input terminal positive and negative electrode of current transforming unit is grounded by over-voltage protector respectively, and capacitor is connected between the input terminal positive and negative electrode of current transforming unit；The input terminal positive and negative electrode of current transforming unit is the input terminal positive and negative electrode for constituting bridge circuit, and the output end of bridge circuit is connected by inductance；Also disclose the system being made of the device.The device simplifies original system, reduce project cost, improve functional reliability, many additional functionalities such as power flowcontrol, utility power quality control can also be realized on the basis of realizing former basic function, power grid is set to obtain higher stability, it realizes more flexible power transmission mode, provides more effective control means for smart grid.
Description
Technical field
The present invention relates to solar power generation control technology field, in particular to a kind of change of current for grid-connected photovoltaic power generation station
Grid-connecting apparatus and system.
Background technique
It is efficient, the cleaning, height of the renewable energy power generation technology by countries in the world of representative with wind energy and solar energy etc.
How by these power safeties degree is paid attention to, access system, needs to solve high-power, efficient energy conversion and control with high quality
Problem processed.Solar energy power generating has important meaning to Optimization of Energy Structure, promotion energy-saving and emission-reduction, realization sustainable economic development
Justice.End the country's photovoltaic installed capacity of the end of the year 2018 and reaches 174.63GW.Undoubtedly improve the safe and economic operation of photo-voltaic power generation station
Level has huge realistic meaning.Traditional large and medium-sized photovoltaic plant is as shown in figure 3, it must configure inverter, by the sun
Can the direct current that issues of photovoltaic cell be converted to alternating current, transformer need to be configured and power grid is wanted in order to which grid-connected remote conveying is returned
The reactive power compensator asked, this structure need to configure all multiple components, and structure is relatively complicated and complicated, project cost height and work
Make less reliable.
Summary of the invention
The primary purpose of the present invention is that providing a kind of change of current grid-connecting apparatus for grid-connected photovoltaic power generation station, it can be achieved that height
Effect, the energy conversion and control of high quality.
In order to achieve the above object, the technical solution adopted by the present invention are as follows: a kind of change of current for grid-connected photovoltaic power generation station is simultaneously
Net device, including N number of current transforming unit, the current transforming unit include over-voltage protector Ri1、Ri2And capacitor Ci1、Ci2、Ci3、
Ci4And inductance Li1、Li2And N number of bridge circuit, wherein [1, N] subscript i ∈；The input terminal positive and negative electrode of i-th of current transforming unit
Pass through over-voltage protector R respectivelyi1、Ri2Ground connection, capacitor Ci1、Ci2Be connected on i-th of current transforming unit input terminal positive and negative electrode it
Between；The input terminal positive and negative electrode of i-th of current transforming unit is the input terminal positive and negative electrode for constituting i-th of bridge circuit, the 1st bridge-type electricity
The output head anode on road passes through inductance L11Present apparatus output head anode is connected, the negative pole of output end of n-th bridge circuit passes through electricity
Feel LN2Present apparatus negative pole of output end is connected, the output head anode of i-th bridge circuit and the output end of i+1 bridge circuit are born
Inductance L is in series between polei2And L(i+1)1；Capacitor C13、C14、…、CN3、CN4It is connected between present apparatus output positive and negative charge；Electricity
Hold Ci1、Ci2Between with capacitor Ci3、Ci4Between pass through conducting wire be shorted.
Compared with prior art, there are following technical effects by the present invention: the present apparatus can realize inversion from direct current to exchange, adjust
Phase, the frequency conversion of AC system, transformation, that is, realize four quadrant running of the high power electronic equipment in PQ plane, Jin Ershi
Now efficient power grid electric energy conversion, the control of power quality；It no longer needs to traditional inverter, transformer, reactive power compensator
(SVG) etc., which simplifies original system, reduces project cost, improves functional reliability, is realizing that conventional electric power is inverse
Become device, power transformer, the electric energy DC/AC morphological transformation of reactive power compensator, voltage class transformation, electrical isolation, energy
Many extra powers such as power flowcontrol, utility power quality control can also be realized on the basis of the basic functions such as amount transmitting and reactive compensation
Can, so that power grid is obtained higher stability, realize more flexible power transmission mode, provides more effectively control hand for smart grid
Section.
It is another object of the present invention to provide a kind of change of current grid-connected systems for grid-connected photovoltaic power generation station, guarantee electricity
Net safe and stable, economic operation.
In order to achieve the above object, the technical solution adopted by the present invention are as follows: a kind of change of current for grid-connected photovoltaic power generation station is simultaneously
Net system, including photovoltaic module, current transformer and control unit, the current transformer include N number of current transforming unit, the unsteady flow
Unit includes over-voltage protector Ri1、Ri2And capacitor Ci1、Ci2、Ci3、Ci4And inductance Li1、Li2And N number of bridge circuit,
Wherein [1, N] subscript i ∈；The input terminal positive and negative electrode of i-th of current transforming unit passes through over-voltage protector R respectivelyi1、Ri2Ground connection,
Capacitor Ci1、Ci2It is connected between the input terminal positive and negative electrode of i-th of current transforming unit；The input terminal positive and negative electrode of i-th of current transforming unit
The input terminal positive and negative electrode of i-th of bridge circuit is constituted, the output head anode of the 1st bridge circuit passes through inductance L11Connection electricity
The negative pole of output end of net anode, n-th bridge circuit passes through inductance LN2Connect power grid cathode, the output end of i-th of bridge circuit
Inductance L is in series between anode and the negative pole of output end of i+1 bridge circuiti2And L(i+1)1；Capacitor C13、C14、…、CN3、CN4
It is connected between current transformer output positive and negative charge；Capacitor Ci1、Ci2Between with capacitor Ci3、Ci4Between pass through conducting wire be shorted；I-th
Photovoltaic module connects the input terminal positive and negative electrode of i-th of current transforming unit, and control unit acquires the electric current and voltage of current transformer input terminal
And current transformer output end electric current and voltage and after being handled output pwm control signal to current transformer.
Compared with prior art, there are following technical effects by the present invention: it is current that the system enormously simplifies photo-voltaic power generation station
Traditional inversion grid connection system is conducive to safe and stable, the economical operation of power grid；Reduce the photo-voltaic power generation station to involve great expense
One-time investment, reduce the running wastage in power station, the popularization of this technology has great social benefit and considerable warp
Ji benefit.
Detailed description of the invention
Fig. 1 is the circuit diagram of grid-connecting apparatus in the present invention；
Fig. 2 is the functional block diagram of grid-connected system in the present invention；
Fig. 3 is the functional block diagram of grid-connected system in the prior art.
Specific embodiment
Below with reference to Fig. 1 to Fig. 2, the present invention is described in further detail.
Refering to fig. 1, a kind of change of current grid-connecting apparatus for grid-connected photovoltaic power generation station, including N number of current transforming unit, the change
Flowing unit includes over-voltage protector Ri1、Ri2And capacitor Ci1、Ci2、Ci3、Ci4And inductance Li1、Li2And N number of bridge-type electricity
Road, wherein [1, N] subscript i ∈；The input terminal positive and negative electrode of i-th of current transforming unit passes through over-voltage protector R respectivelyi1、Ri2It connects
Ground, capacitor Ci1、Ci2It is connected between the input terminal positive and negative electrode of i-th of current transforming unit；The input of i-th of current transforming unit rectifies,
Cathode is the input terminal positive and negative electrode for constituting i-th of bridge circuit, and the output head anode of the 1st bridge circuit passes through inductance L11Even
Present apparatus output head anode is connect, the negative pole of output end of n-th bridge circuit passes through inductance LN2Present apparatus negative pole of output end is connected, the
Inductance L is in series between the output head anode of i bridge circuit and the negative pole of output end of i+1 bridge circuiti2And L(i+1)1；
Capacitor C13、C14、…、CN3、CN4It is connected between present apparatus output positive and negative charge；Capacitor Ci1、Ci2Between with capacitor Ci3、Ci4It
Between pass through conducting wire be shorted.The present apparatus can realize inversion of the direct current to exchange, phase modulation, the frequency conversion of AC system, transformation, that is, realize
High power electronic equipment and then realizes efficient power grid electric energy conversion, power quality in the four quadrant running of PQ plane
Control；It no longer needs to traditional inverter, transformer, reactive power compensator (SVG) etc., which simplifies original system, drop
Low project cost, improves functional reliability, is realizing conventional electric power inverter, power transformer, reactive power compensator
The base of the basic functions such as electric energy DC/AC morphological transformation, voltage class transformation, electrical isolation, energy transmission and reactive compensation
Many additional functionalities such as power flowcontrol, utility power quality control can also be realized on plinth, power grid is made to obtain higher stability, realized
More flexible power transmission mode provides more effective control means for smart grid.
Using the current transformer that PWM is controlled, have many advantages, such as: first, the variation range of output voltage can be increased；Its
Two, output voltage and electric current, the voltage waveform of outputting high quality, low harmonic content can be precisely controlled；Third, can drop
The voltage and current stress of low component, low-voltage power switch and capacitor element using low cost；Fourth, output DC side can
To be easily achieved the power supply of independent direct current unit.
Specifically, the bridge circuit includes the first IGBT module, the second IGBT module, third IGBT module and the
Four IGBT modules, the first IGBT module connect the input anode of current transforming unit, third with the collector of the second IGBT module
IGBT module connects the input cathode of current transforming unit with the emitter of the 4th IGBT module, the emitter of the first IGBT module with
The collector and inductance L of third IGBT modulei1It is connected, the collector of the emitter of the second IGBT module and the 4th IGBT module
And inductance Li2It is connected, the grid of four IGBT modules receives pwm control signal.Four IGBT modules are by insulated gate
Bipolar junction transistor and diode are constituted, Diode series between the collector and emitter of insulated gate bipolar transistor and
The anode of diode is connected with the emitter of insulated gate bipolar transistor.Here the device for high-power power electronic used is exhausted
Edge gate pole bipolar transistor IGBT wholly-controled device, it is very useful.
Refering to fig. 1 and Fig. 2, a kind of change of current grid-connected system for grid-connected photovoltaic power generation station, including photovoltaic module, current transformer
And control unit, the current transformer include multiple current transforming units, and here multiple generally 3N, below to a wherein phase
Be described in detail: the current transforming unit includes over-voltage protector Ri1、Ri2And capacitor Ci1、Ci2、Ci3、Ci4And inductance
Li1、Li2And N number of bridge circuit, wherein [1, N] subscript i ∈；The input terminal positive and negative electrode of i-th of current transforming unit passed through respectively
Voltage protector Ri1、Ri2Ground connection, capacitor Ci1、Ci2It is connected between the input terminal positive and negative electrode of i-th of current transforming unit；I-th of change
The input terminal positive and negative electrode for flowing unit is the input terminal positive and negative electrode for constituting i-th of bridge circuit, the output end of the 1st bridge circuit
Anode passes through inductance L11Connect phase line, this phase line can be A phase or any of B phase or C phase, A, B, C three-phase press with
Upper connection type is configured, in other words: be exactly output end positive and negative electrode in Fig. 2 being respectively L1 and N, then according to Fig. 2's
Circuit continues that 2 groups of identical circuits are arranged, and in addition the output end positive and negative electrode of 2 groups of circuits is respectively L2 and N and L3 and N.N
The negative pole of output end of a bridge circuit passes through inductance LN2Connect zero curve, the output head anode and i+1 bridge of i-th of bridge circuit
Inductance L is in series between the negative pole of output end of formula circuiti2And L(i+1)1；Capacitor C13、C14、…、CN3、CN4It is defeated to be connected on current transformer
Between outlet positive and negative anodes；Capacitor Ci1、Ci2Between with capacitor Ci3、Ci4Between pass through conducting wire be shorted；I-th of photovoltaic module connection i-th
The input terminal positive and negative electrode of a current transforming unit, the electric current and voltage of control unit acquisition current transformer input terminal and current transformer output
The electric current and voltage at end and after being handled output pwm control signal to current transformer.The system enormously simplifies photo-voltaic power generation station
Inversion grid connection system traditional at present, is conducive to safe and stable, the economical operation of power grid；Reduce the photovoltaic hair to involve great expense
The one-time investment in power station, reduces the running wastage in power station, and the popularization of this technology has great social benefit and considerable
Economic benefit.The specific structure of bridge circuit can refer to the description of leading portion, just repeat no more here.
Direct current is converted to the current transformer of exchange, the four quadrant running under PQ coordinate can be achieved in principle, it both can be to power grid
Capacitive reactive power is provided, also can absorb power grid inductive reactive power, and active power is also bidirectional reversible.In detail, the control list
Member can adjust the flow direction of reactive power and active power as follows: (S1) needs to adjust reactive power flowing direction
When, control unit exports the generator rotor angle between the output electric current and network voltage of pwm control signal control current transformer；(S2) it needs to adjust
When saving the flow direction of active power, control unit exports the amplitude of pwm control signal control output current of converter.That is, it is logical
The control of current transformer active power of output and reactive power can be realized in the output current phasor for crossing control current transformer.This is in PWM
It is easily achieved in circuit, such as control unit is taken according to instantaneous power theory based on voltage oriented Direct Power
Control strategy (V-DPC) or the direct Power Control strategy (VF-DPC) oriented based on Virtual shipyard control current transformer.
After the current transformer is grid-connected constant voltage, constant idle or firm power factor power demands can be realized according to grid requirements,
Improve power quality.
Preferably, including energy-storage units, the alternating current on power grid is converted into after direct current directly by current transformer as control
Unit power supply is charged for energy-storage units, and energy-storage units provide backup power source for control unit.The working power of control unit takes
From DC bus, control unit can long-range or local operation, realize starting or shutting down for converter plant, no longer need to press off with height
It closes, it only need to be in high-pressure side configuration isolation disconnecting link or insurance.It is because current transformer can realize the two-way flow of active power, i.e., necessary
The conversion of Shi Yike realization AC/DC, it is possible to directly charge to energy-storage units, no longer need to improve economy with PCS unit.
It further, include over-voltage over-current protection circuit, under-frequency over frequency protection circuit and logical in the control unit
Believe that circuit, over-voltage over-current protection circuit are used to provide over-voltage and overcurrent protection for control unit, under-frequency over frequency protection circuit is control
Unit processed provides under-frequency and over frequency protection, and control unit, which is connected by telecommunication circuit with grid dispatching center, realizes that bi-directional data is logical
News, to realize long-range four distant (telemetering, remote signalling, the remote control, remote regulating) functions with dispatching of power netwoks side.
Claims (10)
1. a kind of change of current grid-connecting apparatus for grid-connected photovoltaic power generation station, it is characterised in that: described including N number of current transforming unit
Current transforming unit includes over-voltage protector Ri1、Ri2And capacitor Ci1、Ci2、Ci3、Ci4And inductance Li1、Li2And N number of bridge-type electricity
Road, wherein [1, N] subscript i ∈；The input terminal positive and negative electrode of i-th of current transforming unit passes through over-voltage protector R respectivelyi1、Ri2It connects
Ground, capacitor Ci1、Ci2It is connected between the input terminal positive and negative electrode of i-th of current transforming unit；The input of i-th of current transforming unit rectifies,
Cathode is the input terminal positive and negative electrode for constituting i-th of bridge circuit, and the output head anode of the 1st bridge circuit passes through inductance L11Even
Present apparatus output head anode is connect, the negative pole of output end of n-th bridge circuit passes through inductance LN2Present apparatus negative pole of output end is connected, the
Inductance L is in series between the output head anode of i bridge circuit and the negative pole of output end of i+1 bridge circuiti2And L(i+1)1；
Capacitor C13、C14、…、CN3、CN4It is connected between present apparatus output positive and negative charge；Capacitor Ci1、Ci2Between with capacitor Ci3、Ci4It
Between pass through conducting wire be shorted.
2. being used for the change of current grid-connecting apparatus at grid-connected photovoltaic power generation station as described in claim 1, it is characterised in that: the bridge-type
Circuit include the first IGBT module, the second IGBT module, third IGBT module and the 4th IGBT module, the first IGBT module and
The input anode of the collector connection current transforming unit of second IGBT module, the transmitting of third IGBT module and the 4th IGBT module
Pole connects the input cathode of current transforming unit, the emitter of the first IGBT module and the collector and inductance of third IGBT module
Li1It is connected, the collector and inductance L of the emitter of the second IGBT module and the 4th IGBT modulei2It is connected, four IGBT modules
Grid receive pwm control signal.
3. being used for the change of current grid-connecting apparatus at grid-connected photovoltaic power generation station as claimed in claim 2, it is characterised in that: described four
IGBT module is made of insulated gate bipolar transistor and diode, collection of the Diode series in insulated gate bipolar transistor
Between electrode and emitter and the anode of diode is connected with the emitter of insulated gate bipolar transistor.
4. a kind of change of current grid-connected system for grid-connected photovoltaic power generation station, it is characterised in that: including photovoltaic module, current transformer and
Control unit, the current transformer include multiple current transforming units, and the current transforming unit includes over-voltage protector Ri1、Ri2With
And capacitor Ci1、Ci2、Ci3、Ci4And inductance Li1、Li2And N number of bridge circuit, wherein [1, N] subscript i ∈；I-th of unsteady flow list
The input terminal positive and negative electrode of member passes through over-voltage protector R respectivelyi1、Ri2Ground connection, capacitor Ci1、Ci2It is connected on i-th of current transforming unit
Input terminal positive and negative electrode between；The input terminal positive and negative electrode of i-th of current transforming unit is the input terminal for constituting i-th of bridge circuit
The output head anode of positive and negative electrode, the 1st bridge circuit passes through inductance L11Connect phase line, the negative pole of output end of n-th bridge circuit
Pass through inductance LN2Zero curve is connected, between the output head anode of i-th bridge circuit and the negative pole of output end of i+1 bridge circuit
It is in series with inductance Li2And L(i+1)1；Capacitor C13、C14、…、CN3、CN4It is connected between current transformer output positive and negative charge；Capacitor Ci1、
Ci2Between with capacitor Ci3、Ci4Between pass through conducting wire be shorted；The input that i-th photovoltaic module connects i-th of current transforming unit rectifies,
Cathode, the electric current of control unit acquisition current transformer input terminal and the electric current and voltage of voltage and current transformer output end are simultaneously located
Pwm control signal is exported after reason to current transformer.
5. being used for the change of current grid-connected system at grid-connected photovoltaic power generation station as claimed in claim 4, it is characterised in that: the bridge-type
Circuit include the first IGBT module, the second IGBT module, third IGBT module and the 4th IGBT module, the first IGBT module and
The input anode of the collector connection current transforming unit of second IGBT module, the transmitting of third IGBT module and the 4th IGBT module
Pole connects the input cathode of current transforming unit, the emitter of the first IGBT module and the collector and inductance of third IGBT module
Li1It is connected, the collector and inductance L of the emitter of the second IGBT module and the 4th IGBT modulei2It is connected, four IGBT modules
Grid reception control unit output pwm control signal.
6. being used for the change of current grid-connected system at grid-connected photovoltaic power generation station as claimed in claim 5, it is characterised in that: four IGBT moulds
Block is made of insulated gate bipolar transistor and diode, Diode series insulated gate bipolar transistor collector and
Between emitter and the anode of diode is connected with the emitter of insulated gate bipolar transistor.
7. being used for the change of current grid-connected system at grid-connected photovoltaic power generation station as claimed in claim 6, it is characterised in that: the control
Unit is taken according to instantaneous power theory based on voltage oriented direct Power Control strategy or based on Virtual shipyard orientation
Direct Power Control strategy controls current transformer.
8. being used for the change of current grid-connected system at grid-connected photovoltaic power generation station as claimed in claim 7, it is characterised in that: the control
Unit adjusts the flow direction of reactive power and active power as follows:
(S1) when needing to adjust reactive power flowing direction, control unit exports the output electricity of pwm control signal control current transformer
Generator rotor angle between stream and network voltage；
(S2) when needing to adjust the flow direction of active power, control unit exports pwm control signal control current transformer output electricity
The amplitude of stream.
9. being used for the change of current grid-connected system at grid-connected photovoltaic power generation station as claimed in claim 8, it is characterised in that: including energy storage list
Member, alternating current on power grid be converted into after direct current being directly control unit power supply or being energy-storage units charging by current transformer,
Energy-storage units provide backup power source for control unit.
10. being used for the change of current grid-connected system at grid-connected photovoltaic power generation station as claimed in claim 9, it is characterised in that: the control
It include over-voltage over-current protection circuit, under-frequency over frequency protection circuit and telecommunication circuit in unit processed, over-voltage over-current protection circuit is used
In providing over-voltage and overcurrent protection for control unit, under-frequency over frequency protection circuit provides under-frequency and over frequency protection for control unit,
Control unit, which is connected by telecommunication circuit with grid dispatching center, realizes two-way data communication.
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| CN110176782A (en) * | 2019-05-29 | 2019-08-27 | 王阳 | Change of current grid-connecting apparatus and system for grid-connected photovoltaic power generation station |
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| CN110176782A (en) * | 2019-05-29 | 2019-08-27 | 王阳 | Change of current grid-connecting apparatus and system for grid-connected photovoltaic power generation station |
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Effective date of registration: 20200807 Address after: Room 602, unit 2, building 132, No. 376, Nanchang Road, shayiba District, Urumqi, Xinjiang Uygur Autonomous Region Patentee after: Xinjiang zhengyilian Power Equipment Co., Ltd Address before: 230000 Room 402, 11 Block 79, Jinzhai Road, Shushan District, Hefei City, Anhui Province Patentee before: Wang Yang |
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Effective date of registration: 20210128 Address after: 230000 room 402, building 11, 79 Jinzhai Road, Shushan District, Hefei City, Anhui Province Patentee after: Wang Yang Address before: Room 602, unit 2, building 132, 376 Nanchang Road, shayibak District, Urumqi, Xinjiang Uygur Autonomous Region 830052 Patentee before: Xinjiang zhengyilian Power Equipment Co., Ltd |
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