CN106849625A - The impedance filter circuit and its control method of new energy power generation grid-connection current transformer - Google Patents
The impedance filter circuit and its control method of new energy power generation grid-connection current transformer Download PDFInfo
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- CN106849625A CN106849625A CN201710131717.3A CN201710131717A CN106849625A CN 106849625 A CN106849625 A CN 106849625A CN 201710131717 A CN201710131717 A CN 201710131717A CN 106849625 A CN106849625 A CN 106849625A
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- 238000000034 method Methods 0.000 title claims abstract description 11
- 238000010248 power generation Methods 0.000 title claims abstract description 9
- 230000009514 concussion Effects 0.000 claims abstract description 14
- 230000009471 action Effects 0.000 claims description 7
- 230000008859 change Effects 0.000 abstract description 8
- 230000003993 interaction Effects 0.000 abstract description 3
- 239000003990 capacitor Substances 0.000 description 6
- 238000010586 diagram Methods 0.000 description 5
- 238000001914 filtration Methods 0.000 description 5
- 230000010355 oscillation Effects 0.000 description 5
- 230000003321 amplification Effects 0.000 description 3
- 238000003199 nucleic acid amplification method Methods 0.000 description 3
- 230000005611 electricity Effects 0.000 description 2
- 230000006978 adaptation Effects 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000011217 control strategy Methods 0.000 description 1
- 238000013016 damping Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/12—Arrangements for reducing harmonics from ac input or output
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- H02J3/382—
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Supply And Distribution Of Alternating Current (AREA)
Abstract
The present invention relates to the impedance filter circuit and its control method of a kind of new energy power generation grid-connection current transformer, in the filter circuit of grid-connected converter, the controllable switching capacitance group of multigroup parallel connection is provided with；Each group of electric capacity and gate-controlled switch comprising series connection；Distinguish the controller that signal is connected by with each group gate-controlled switch, send and order about the instruction that the gate-controlled switch of setting group number is closed or disconnected, the electric capacity of respective sets number is put into the filter circuit or is cut off from the filter circuit.The present invention passes through to change capacitance group quantity in parallel, can adjust the filter circuit impedance of current transformer, effectively solves the problems, such as grid-connected converter and generation harmonic wave concussion in power network and miscellaneous part interaction in new energy grid-connected power system.
Description
Technical field
The present invention relates to a kind of filter circuit, more particularly to a kind of impedance filtered electrical of new energy power generation grid-connection current transformer
Road and its control method.
Background technology
The filter circuit of new energy grid-connected power grid-connected converter typically uses LC forms or LCL forms, for that will become
It is AC sine wave that the high-frequency impulse popin of stream device output is slided, and improves the grid-connected quality of power supply.LC filter circuits and LCL filtered electricals
Shown in road main circuit principle schematic below figure 1,2.
New-energy grid-connected current transformer filter circuit is general to design corresponding parameter value according to current transformer self-characteristic.Such as open
After closing the parameter determinations such as frequency, control frequency, installed capacity, inductance L, the electric capacity C for having design preset parameter filter inversion electricity
The harmonic wave that road produces, makes the electric energy being input in power network be smooth sinusoidal wave.
As mentioned previously, new-energy grid-connected current transformer only considers to filter the switch harmonic of inverter circuit generation itself, not
Consider the influence of adaptation power network and miscellaneous part and the harmonic wave of grid-connected converter interaction.Exist when in power network and miscellaneous part
During harmonic wave, LC filter circuits, LCL filter circuits can produce waveform high frequency oscillation to amplify with the impedance of power network and miscellaneous part, this
A little high frequency oscillations amplify and can deteriorate and network electric energy quality, the problems such as causing part to burn or make shortened equipment life.
If power network or miscellaneous part are in new energy equipment running, certain operating mode produces 1.5kHz harmonic waves, and
The LC filter circuits of grid-connected converter or the Low ESR Frequency point of LCL filter circuits also near 1.5kHz, then grid-connected converter
The grid entry point of device can produce 1.5kHz Harmonics amplification phenomenons, it is serious in the case of can produce equipment burnout or the current transformer can not be simultaneously
Situations such as net, bring about great losses.
The software controlling strategies such as active damping control can be carried out in control algolithm for low frequency oscillation to be solved, but
For high frequency oscillation, because controller sample frequency and control bandwidth limitation can not be solved by software control algorithm.
The content of the invention
The present invention is proposed suitable for the impedance filter circuit topological invention of new energy power generation grid-connection current transformer and control
Strategy, for solving electrical parameter impedance high frequency oscillation between grid-connected converter and power network and miscellaneous part, the problem of Harmonics amplification.
In order to achieve the above object, technical program of the present invention lies in providing a kind of change of new energy power generation grid-connection current transformer
Impedance filtering circuit, it is characterised in that
In the filter circuit of grid-connected converter, the controllable switching capacitance group of multigroup parallel connection is provided with；Each group includes series connection
Electric capacity and gate-controlled switch；
Distinguish the controller that is connected of signal by with each group gate-controlled switch, send and order about the gate-controlled switch of setting group number and closed
Or the instruction for disconnecting, the electric capacity of respective sets number is put into the filter circuit or is cut off from the filter circuit.
Alternatively, the filter circuit is the LC wave filters or LCL filter circuits being located between inverter circuit and power network.
Alternatively, the gate-controlled switch is relay.
Alternatively, the capacitance of each group electric capacity is equal or unequal.
Another technical scheme of the invention is to provide a kind of control method of above-mentioned impedance filter circuit, in grid-connected change
Flow in the running of device, the operating mode of concussion is produced according to harmonic source and filter circuit, controller is calculated as eliminating concussion needs
The quantity of the controllable switching capacitance group for being put into filter circuit or being cut off；
The controller sends instruction, make needs put into or the controllable switching capacitance group of excision in gate-controlled switch closed or
Disconnect, corresponding electric capacity is put into the filter circuit or from filter circuit excision, impedance is carried out to filter circuit
Adjustment.
Alternatively, in the running of grid-connected converter, the controllable switching capacitance group put into for needed for confirming, the control
Device processed is compared to the switching frequency of each group electric capacity, first puts into the small electric capacity of switching frequency；When switching frequency is equal, first will
The small electric capacity input of operation time；
In the running of grid-connected converter, the controllable switching capacitance group cut off for needed for confirming, the controller is to each group
The run time of electric capacity is compared, and first cuts off the big electric capacity of operation time；When run time is equal, first by switching frequency
Big electric capacity excision.
Alternatively, before grid-connected converter operation, the starting state comprising grid-connected converter；
In the start-up conditions, the controller is read out to every group of switching frequency of electric capacity, run time in filter circuit；Press
According to switch harmonic requirement is filtered, the operational factor of filter circuit is set, determine the controllable switching capacitance group that starting state need to put into
Quantity；
The controllable switching capacitance group put into for needed for confirming, the controller is compared to the switching frequency of each group electric capacity, first
By the small electric capacity input of switching frequency；When switching frequency is equal, first the small electric capacity of operation time is put into.
Alternatively, in the running of grid-connected converter, the controller reads the capacitance operation time of real-time update；
After completing to be put into filter circuit or cut off the action of electric capacity, the controller reads the electric capacity action frequency for updating.
Compared with prior art, the impedance filter circuit of new energy power generation grid-connection current transformer of the present invention and its control
Method, the advantage is that：
When inductance, capacitance parameter for traditional grid-connected converter filter circuit are fixed, the invention provides one kind filtering
The novel topological structure of circuit.Inductance parameters are not easy to regulation due to demand for control and series connection reason.On this basis, this hair
It is bright that multigroup electric capacity in parallel is set, while increase corresponding gate-controlled switch, according to the instruction that controller is proposed with reference to real-time working condition
Put into or cut off.The present invention can be used to change grid-connected converter filter circuit impedance parameter, realize with power network and other
The impedance matching of part, so as to solve the height that current transformer is produced by filter circuit impedance and power network and miscellaneous part impedance mismatch
Frequency resonance problems.In specific embodiment, capacitance group input calculates its run time by controller respectively with excision, preferential input
The capacitor that run time is short, switch motion number of times is few, plays increase component life effect.
Brief description of the drawings
Fig. 1 is traditional grid-connected converter LC filter circuit schematic diagrames；
Fig. 2 is traditional grid-connected converter LCL filter circuit schematic diagrames；
Fig. 3 is the LC filter circuit topological invention schematic diagrames of impedance pattern in the present invention；
Fig. 4 is the LCL filter circuit topological invention schematic diagrames of impedance pattern in the present invention；
Fig. 5 is the schematic diagram of current transformer filter circuit impedance control logic in the present invention.
Specific embodiment
The present invention provides a kind of impedance filter circuit and its control method, it is adaptable to new energy power generation grid-connection current transformer.
By multigroup controllable switching capacitance group formation filter circuit circuit in parallel, i.e. equipped with multigroup in the filter circuit of grid-connected converter
By the capacitor bank of switch control, so as to be put into according to grid-connected converter real time execution situation or cut off respective sets number electric capacity.
The circuit can be used to change grid-connected converter filter circuit impedance parameter, to realize and power network and miscellaneous part
Impedance matching, so as to solve the high-frequency resonant that current transformer is produced by filter circuit impedance and power network and miscellaneous part impedance mismatch
Problem.
The filter circuit circuit including but not limited to LC wave filters or LCL filter, distinguish by its main circuit topological structure
As shown in Figure 3, Figure 4.Between inductance L and power network in LC filter circuits, or inductance L1 and L2 in LCL filter circuits
Between, it is provided with the n group capacitance switch switching circuits of parallel connection；Each group comprising series connection electric capacity and gate-controlled switch, by it is described can
Control switch realizes input or the excision of corresponding capacitance.N is right according to Converter Capacity, capacitor's capacity, filtering requirements more than or equal to 2
The numerical value of n is configured.
It is further provided with gate-controlled switch difference signal of the controller with every group to be connected, for controlling electricity according to real-time working condition
Hold the input and excision strategy of switch on-off circuit, that is, control the group number of the specific shunt capacitance for needing and putting into or cut off.
Whether electric capacity, can be by the idle of fling-cut switch auxiliary contact closure state and change by instruction input and excision
Electric current judges.Gate-controlled switch can be realized by relay, but be not limited to relay mode.The capacitance of each group electric capacity can be with equal or not
Deng being not limited to equal situation.
For example, having put into 2 groups of electric capacity when grid-connected converter starts, can meet and filter wanting for inverter circuit switch harmonic
Ask.In running, 1.5kHz harmonic sources are occurred in that in certain running status system, the harmonic source is generated with filter circuit
Concussion.Now controller detects the operating mode, by way of being detected again after controller is adjusted or by way of tabling look-up, can
Concussion is eliminated by 2 groups of electric capacity to calculate put into again.Therefore, controller sends 2 groups of instructions of electric capacity of input, during to starting
The 2 groups of capacitance switch switching circuits not put into send instruction, to control gate-controlled switch respective closed therein.And when input is multigroup
Electric capacity causes concussion, and the logic control for cutting off electric capacity is same.
As shown in figure 5, the excision of electric capacity and input control program circuit in the present invention, comprising：
S1, current transformer start
Controller is read out to every group in filter circuit of capacitor switching number of times Mn, running time T n；According to filtering, switch is humorous
Ripple requirement, setting filter parameter operation.
Controller determines the capacitance group quantity that starting state need to put into, the corresponding switching switch closure of control.Wherein, preferentially
The input electric capacity that switching frequency is few, run time is short.Therefore, can preferentially judge the switching frequency of electric capacity, first by switching frequency
Small electric capacity input；In the case that switching frequency is equal, first the small electric capacity of operation time is put into.
S2, current transformer operation
Period controller reads the capacitance operation time Tn of real-time update.
S3, concussion judge
Controller judges whether harmonic source produces concussion with filter circuit according to the testing result to corresponding duty parameter.If not yet
There is generation concussion, keep existing running status；If producing concussion, step S4 is performed.
S4, change filter parameter
Controller is analyzed to the concussion for producing, and calculates the capacitance group quantity for needing to change, and performs corresponding switching action, control
The gate-controlled switch closure or disconnection of system input or the capacitance group of excision.If input electric capacity, then when selecting to add electric capacity
Priority, logic when in principle with starting state is identical；If logic phase when excision electric capacity, its priority and startup
Instead（The preferential electric capacity for judging and cutting off long operational time, preferential excision switching frequency big electric capacity when run time is equal）.
After completing switching action, controller reads the action frequency Mn for updating.Current transformer is returned with the filtering after parameter adjustment
Road continues to run with.
In sum, capacitor loops of the present invention in filter circuit, the multiple unit capacitor controlled using gate-controlled switch
Structure；When filter circuit changes parameter, corresponding control can be carried out to excision to the input of capacitance group.By changing shunt capacitance
Group number, can adjust the filter circuit impedance of current transformer.When therefore there is harmonic source in systems, Harmonics amplification is not produced, together
When decay filter harmonic wave, the present invention efficiently solves grid-connected converter and power network and miscellaneous part in new energy grid-connected power system
The problem of harmonic wave concussion is produced in interaction.
Although present disclosure is discussed in detail by above preferred embodiment, but it should be appreciated that above-mentioned
Description is not considered as limitation of the present invention.After those skilled in the art have read the above, for of the invention
Various modifications and substitutions all will be apparent.Therefore, protection scope of the present invention should be limited to the appended claims.
Claims (8)
1. a kind of impedance filter circuit of new energy power generation grid-connection current transformer, it is characterised in that
In the filter circuit of grid-connected converter, the controllable switching capacitance group of multigroup parallel connection is provided with；Each group includes series connection
Electric capacity and gate-controlled switch；
Distinguish the controller that is connected of signal by with each group gate-controlled switch, send and order about the gate-controlled switch of setting group number and closed
Or the instruction for disconnecting, the electric capacity of respective sets number is put into the filter circuit or is cut off from the filter circuit.
2. impedance filter circuit as claimed in claim 1, it is characterised in that
The filter circuit is the LC wave filters or LCL filter circuits being located between inverter circuit and power network.
3. impedance filter circuit as claimed in claim 1, it is characterised in that
The gate-controlled switch is relay.
4. impedance filter circuit as claimed in claim 1, it is characterised in that
The capacitance of each group electric capacity is equal or unequal.
5. in a kind of claim 1-4 any one impedance filter circuit control method, it is characterised in that
In the running of grid-connected converter, the operating mode of concussion is produced according to harmonic source and filter circuit, controller is calculated as
Eliminating concussion needs the quantity of input or the controllable switching capacitance group for cutting off in filter circuit；
The controller sends instruction, make needs put into or the controllable switching capacitance group of excision in gate-controlled switch closed or
Disconnect, corresponding electric capacity is put into the filter circuit or from filter circuit excision, impedance is carried out to filter circuit
Adjustment.
6. the control method of impedance filter circuit as claimed in claim 5, it is characterised in that
In the running of grid-connected converter, the controllable switching capacitance group put into for needed for confirming, the controller is to each group
The switching frequency of electric capacity is compared, and first puts into the small electric capacity of switching frequency；When switching frequency is equal, first by operation time
Small electric capacity input；
In the running of grid-connected converter, the controllable switching capacitance group cut off for needed for confirming, the controller is to each group
The run time of electric capacity is compared, and first cuts off the big electric capacity of operation time；When run time is equal, first by switching frequency
Big electric capacity excision.
7. the control method of impedance filter circuit as claimed in claim 6, it is characterised in that
Before grid-connected converter operation, the starting state comprising grid-connected converter；
In the start-up conditions, the controller is read out to every group of switching frequency of electric capacity, run time in filter circuit；Press
According to switch harmonic requirement is filtered, the operational factor of filter circuit is set, determine the controllable switching capacitance group that starting state need to put into
Quantity；
The controllable switching capacitance group put into for needed for confirming, the controller is compared to the switching frequency of each group electric capacity, first
By the small electric capacity input of switching frequency；When switching frequency is equal, first the small electric capacity of operation time is put into.
8. the control method of impedance filter circuit as claimed in claim 6, it is characterised in that
In the running of grid-connected converter, the controller reads the capacitance operation time of real-time update；
After completing to be put into filter circuit or cut off the action of electric capacity, the controller reads the electric capacity action frequency for updating.
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| CN201710131717.3A CN106849625A (en) | 2017-03-07 | 2017-03-07 | The impedance filter circuit and its control method of new energy power generation grid-connection current transformer |
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| CN201710131717.3A CN106849625A (en) | 2017-03-07 | 2017-03-07 | The impedance filter circuit and its control method of new energy power generation grid-connection current transformer |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107565565A (en) * | 2017-08-25 | 2018-01-09 | 上海蓝瑞电气有限公司 | Automatically adjust resonant frequency LCL filter and its method of work |
| CN109412178A (en) * | 2018-10-19 | 2019-03-01 | 湖南大学 | A kind of switching control method of high-voltage large-capacity impedance measurement equipment |
| CN110460053A (en) * | 2019-04-25 | 2019-11-15 | 南京科技职业学院 | A kind of grid-connected filtering automatic regulating system of double-fed fan motor unit and method |
| CN112688360A (en) * | 2020-12-11 | 2021-04-20 | 阳光电源股份有限公司 | Double-fed converter filtering control device and method and power generation system |
| CN112701690A (en) * | 2020-12-22 | 2021-04-23 | 珠海格力电器股份有限公司 | Harmonic optimization control method and device and power supply system |
| CN117269604A (en) * | 2023-09-18 | 2023-12-22 | 四川大学 | Multi-harmonic source responsibility quantification method and system considering impedance change |
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| CN104135016A (en) * | 2014-08-20 | 2014-11-05 | 国家电网公司 | Reactive compensation device suitable for new energy grid-connected power generation system |
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107565565A (en) * | 2017-08-25 | 2018-01-09 | 上海蓝瑞电气有限公司 | Automatically adjust resonant frequency LCL filter and its method of work |
| CN109412178A (en) * | 2018-10-19 | 2019-03-01 | 湖南大学 | A kind of switching control method of high-voltage large-capacity impedance measurement equipment |
| CN109412178B (en) * | 2018-10-19 | 2021-04-30 | 湖南大学 | Switching control method of high-voltage high-capacity impedance measurement equipment |
| CN110460053A (en) * | 2019-04-25 | 2019-11-15 | 南京科技职业学院 | A kind of grid-connected filtering automatic regulating system of double-fed fan motor unit and method |
| CN110460053B (en) * | 2019-04-25 | 2023-02-28 | 南京科技职业学院 | Grid-connected filtering automatic adjusting system and method for double-fed wind turbine generator |
| CN112688360A (en) * | 2020-12-11 | 2021-04-20 | 阳光电源股份有限公司 | Double-fed converter filtering control device and method and power generation system |
| CN112688360B (en) * | 2020-12-11 | 2023-06-30 | 阳光电源股份有限公司 | Filtering control device and method for doubly-fed converter and power generation system |
| CN112701690A (en) * | 2020-12-22 | 2021-04-23 | 珠海格力电器股份有限公司 | Harmonic optimization control method and device and power supply system |
| CN117269604A (en) * | 2023-09-18 | 2023-12-22 | 四川大学 | Multi-harmonic source responsibility quantification method and system considering impedance change |
| CN117269604B (en) * | 2023-09-18 | 2024-04-30 | 四川大学 | Multi-harmonic source responsibility quantification method and system considering impedance change |
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Application publication date: 20170613 |