CN206461525U - A kind of power-converting device and micro-capacitance sensor - Google Patents
A kind of power-converting device and micro-capacitance sensor Download PDFInfo
- Publication number
- CN206461525U CN206461525U CN201621250413.6U CN201621250413U CN206461525U CN 206461525 U CN206461525 U CN 206461525U CN 201621250413 U CN201621250413 U CN 201621250413U CN 206461525 U CN206461525 U CN 206461525U
- Authority
- CN
- China
- Prior art keywords
- current
- voltage
- power
- direct current
- micro
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Withdrawn - After Issue
Links
Classifications
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes
Landscapes
- Inverter Devices (AREA)
Abstract
The utility model discloses a kind of power-converting device and micro-capacitance sensor.Wherein power-converting device includes：Direct current side ports, direct current pre-charge circuit, DC voltage-stabilizing resonance circuit, four quadrant running power converter, ac filter circuit, exchange pre-charge circuit, the exchange side ports sequentially connected；The direct current pre-charge circuit includes multiple current-limiting resistances, for carrying out current limliting to DC side electric current；Wherein, the current-limiting resistance quantity of access circuit can adjust；The exchange pre-charge circuit includes multiple current-limiting resistances, for carrying out current limliting to ac-side current；Wherein, the current-limiting resistance quantity of access circuit can adjust.The technical scheme causes the power-converting device direct current side ports voltage accessible with side ports are exchanged in a wider scope, so as to which the application environment of the power-converting device be widened significantly, for example applied in micro-capacitance sensor, it is adapted to the voltage pulsation of regional power grid, with good stability, internal components are hardly damaged.
Description
Technical field
The utility model is related to power converter technical field, and in particular to a kind of power-converting device and micro-capacitance sensor.
Background technology
It is straight to become that with the development of power converter technology, power converter can realize friendship in the prior art-straight conversion, straight-
A variety of power converters such as change.But existing power converter often has strict requirements to suitable environment, for example, it is desirable to electricity
The output voltage of source is in narrower scope.Thus existing power converter is not appropriate for applying in many output voltages not
In stable environment.
Although for example, bulk power grid at present high development, for more remote Agriculture, forestry And Animal Husbandry mining area, frontier sentry
Or the island away from continent, because away from generating center, relatively low or unstable line voltage is common phenomenon.In recent years
Fast-developing micro-capacitance sensor technology, the output for the distributed energy that can dissolve nearby improves the quality of power supply of remote districts, possessed
To the effect of the peak load shifting of bulk power grid, it can solve the problems, such as that current bulk power grid is powered the power shortage of isolated island well.But, micro-
, it is necessary to which power application converting means, one end is connected with the regional power grid in the region under the networked mode of power network, the other end and micro- electricity
Energy storage device in net is attached, and regional power grid is the problem of there is above-mentioned low voltage or be unstable, and storage
Can device vary, even if the energy storage device of same medium as its remaining charged capacity (Sate of Charge,
SOC difference), and different output voltages are shown, therefore existing power-converting device can not be applied in class well
As in environment.
Utility model content
In view of the above problems, it is proposed that the utility model overcomes above mentioned problem to provide one kind or solved at least in part
The certainly power-converting device and micro-capacitance sensor of above mentioned problem.
According to one side of the present utility model there is provided a kind of power-converting device, including：
The direct current side ports that sequentially connect, direct current pre-charge circuit, DC voltage-stabilizing resonance circuit, four quadrant running electric power become
Parallel operation, ac filter circuit, exchange pre-charge circuit, exchange side ports；
The direct current pre-charge circuit includes multiple current-limiting resistances, for carrying out current limliting to DC side electric current；Wherein, access
The current-limiting resistance quantity of circuit can adjust；
The exchange pre-charge circuit includes multiple current-limiting resistances, for carrying out current limliting to ac-side current；Wherein, access
The current-limiting resistance quantity of circuit can adjust.
Alternatively, the direct current pre-charge circuit includes：N number of current-limiting resistance and N+1 switch, wherein, N number of current limliting
Resistance and a switch in parallel, and each current-limiting resistance is connected with a switch；
The exchange pre-charge circuit includes：M current-limiting resistance and M+1 switch, wherein, the M current-limiting resistance and
One switch in parallel, and each current-limiting resistance is connected with a switch；
Wherein, M and N is natural number.
Alternatively, the DC voltage-stabilizing resonance circuit includes：LC series resonant circuits and voltage regulation capacitor in parallel therewith；
The ac filter circuit is LC types filter circuit or LCL type filter circuit.
Alternatively, the four quadrant running power converter is full-bridge type topological structure, including：Four full control property derailing switches
Part, wherein, each full control property switching device is also parallel with high frequency capacitance.
Alternatively, the device also includes：
Controller, including the first port being connected with the four quadrant running power converter, for exporting direct current
Be converted to the control instruction of alternating current or alternating current is converted to the control instruction of direct current.
Alternatively, the controller also includes：
Second port, the output voltage of the regional power grid for being connected to the micro-capacitance sensor is sampled；
3rd port, for when the output voltage for the regional power grid that sampling is obtained is outside the first preset range, output to be controlled
Make the grid-connected instruction for switching off connection between the micro-capacitance sensor and regional power grid so that the micro-capacitance sensor is in off-network pattern.
Alternatively, the controller also includes：4th port, fifth port, the 6th port, the 7th port, the 8th port；
The controller, is additionally operable to default first in the second port obtained output voltage of regional power grid of sampling
In the range of when, the output voltage of regional power grid obtained according to sampling, by the 4th port output by the current limliting of respective numbers
The instruction of the resistance access exchange pre-charge circuit；Reached in the current-limiting resistance access exchange pre-charge circuit of respective numbers
During to the first delay time, by the fifth port between the direct current pre-charge circuit and the DC voltage-stabilizing resonance circuit
DC voltage is sampled；When the difference of the DC voltage that sampling is obtained and the output voltage of the regional power grid sampled and obtained
When outside the second preset range, the instruction for disconnecting all circuits in the power-converting device is exported by the 6th port；
When the DC voltage and the difference of the output voltage of the obtained regional power grid of sampling that sampling is obtained are in the second preset range
When, by instruction of the 4th port outputting cutting except all current-limiting resistances accessed in the exchange pre-charge circuit, by described
7th port is sampled by the output voltage of the energy storage device in the micro-capacitance sensor；According to sampling obtain energy storage device it is defeated
Go out voltage, the instruction that the current-limiting resistance of respective numbers is accessed to the direct current pre-charge circuit is exported by the 8th port；
When the current-limiting resistance access direct current pre-charge circuit of respective numbers reaches the second delay time, by the fifth port again
DC voltage between the direct current pre-charge circuit and the DC voltage-stabilizing resonance circuit is sampled, obtained when new sampling
When the difference of the output voltage for the energy storage device that DC voltage is obtained with the sampling is outside the 3rd preset range, by the described 6th
Port output disconnects the instruction of all circuits in the power-converting device；The DC voltage obtained when newly sampling is adopted with described
When the difference of the output voltage for the energy storage device that sample is obtained is in the 3rd preset range, by the 8th port outputting cutting except described
The instruction of all current-limiting resistances accessed in direct current pre-charge circuit.
According to another aspect of the present utility model there is provided a kind of micro-capacitance sensor, including：
Grid-connected switch, ac bus, power-converting device as described above described in any one, energy storage device, distributed power source,
Local load, multiple branch switch；
Wherein, the ac bus is electrically connected by the grid-connected regional power grid being connected with the micro-capacitance sensor that switchs；
The local load is electrically connected by branch switch with the ac bus；
Each power supply in the distributed power source is electrically connected by branch switch with the ac bus respectively；
The direct current side ports outer end of the power-converting device is electrically connected with the energy storage device, the power-converting device
Exchange side ports outer end electrically connected by branch switch with the ac bus.
Alternatively, the grid-connected switch and/or branch switch are realized with following any device：Grid-connected contactor, sky
Air cock, static switch.
Alternatively, the micro-capacitance sensor also includes：Micro-capacitance sensor central controller, for the branch switch send closure/
Open command, correspondingly controls the branch switch to close or disconnect；For sending startup/stopping to the power-converting device
Instruction, correspondingly controls startup/stopping of the power-converting device；And filled for being sent to the power-converting device
Electricity/electric discharge instruction, controls the power-converting device to carry out charge/discharge to the energy storage device.
As shown in the above, the technical solution of the utility model, passes through the direct current side ports that sequentially connect, direct current preliminary filling
Circuit, DC voltage-stabilizing resonance circuit, four quadrant running power converter, ac filter circuit, exchange pre-charge circuit, exchange
Side ports constitute power-converting device, and respectively by adjust in direct current pre-charge circuit access circuit current-limiting resistance quantity and
The current-limiting resistance quantity of access circuit to carry out current limliting to DC side electric current and ac-side current in exchange pre-charge circuit.The skill
Art scheme causes the power-converting device direct current side ports voltage accessible with side ports are exchanged in a wider scope, from
And widen the application environment of the power-converting device significantly, such as applied to the electricity in micro-capacitance sensor, being adapted to regional power grid
Pressure fluctuation, with good stability, internal components are hardly damaged.
Described above is only the general introduction of technical solutions of the utility model, in order to better understand skill of the present utility model
Art means, and being practiced according to the content of specification, and in order to allow above and other purpose of the present utility model, feature
It can be become apparent with advantage, below especially exemplified by embodiment of the present utility model.
Brief description of the drawings
By reading the detailed description of hereafter preferred embodiment, various other advantages and benefit is common for this area
Technical staff will be clear understanding.Accompanying drawing is only used for showing the purpose of preferred embodiment, and is not considered as to this practicality
New limitation.And in whole accompanying drawing, identical part is denoted by the same reference numerals.In the accompanying drawings：
Fig. 1 shows a kind of structural representation of power-converting device according to the utility model one embodiment；
Fig. 2-a show the circuit diagram of the direct current pre-charge circuit according to the utility model one embodiment；
Fig. 2-b show the circuit diagram of the exchange pre-charge circuit according to the utility model one embodiment；
Fig. 3 shows a kind of circuit diagram of DC voltage-stabilizing resonance circuit 130 according to the utility model one embodiment；
Fig. 4 shows the structural representation of the four quadrant running power converter 140 according to the utility model one embodiment
Figure；
Fig. 5 shows a kind of structural representation of micro-capacitance sensor according to the utility model one embodiment；
Fig. 6 shows that the voltage vector of four quadrant running power converter exchange outlet side calculates schematic diagram.
Embodiment
The exemplary embodiment of the disclosure is more fully described below with reference to accompanying drawings.Although showing the disclosure in accompanying drawing
Exemplary embodiment, it being understood, however, that may be realized in various forms the disclosure without should be by embodiments set forth here
Limited.On the contrary, these embodiments are provided to facilitate a more thoroughly understanding of the present invention, and can be by the scope of the present disclosure
Complete conveys to those skilled in the art.
Fig. 1 shows a kind of structural representation of power-converting device according to the utility model one embodiment, the dress
Put and can be applied in micro-capacitance sensor.As shown in figure 1, power-converting device 100 includes：
The direct current side ports 110 that sequentially connect, direct current pre-charge circuit 120, DC voltage-stabilizing resonance circuit 130, four-quadrant
Operation power converter 140, ac filter circuit 150, exchange pre-charge circuit 160, exchange side ports 170.
For example, direct current side ports 110 can be connected with the energy storage device in micro-capacitance sensor, exchange side ports 170 can be with micro-capacitance sensor
The regional power grid connection accessed.
Direct current pre-charge circuit 120 includes multiple current-limiting resistances, for carrying out current limliting to DC side electric current；Wherein, access
The current-limiting resistance quantity of circuit can adjust；Exchanging pre-charge circuit 160 includes multiple current-limiting resistances, for entering to ac-side current
Row current limliting；Wherein, the current-limiting resistance quantity of access circuit can adjust.
Direct current pre-charge circuit 120 carries out current limliting to DC side electric current, can prevent the excessive damage direct current of DC side electric current
Capacitor element in voltage stabilizing resonance circuit 130；Similarly, exchange pre-charge circuit 160 carries out current limliting to ac-side current, can be with
Prevent the excessive capacitor element damaged in ac filter circuit 150 of ac-side current.
DC power conversion can be alternating current by four quadrant running power converter 140, can also be by convert alternating current
Direct current, is applied in micro-capacitance sensor, can be charged for the energy storage device of micro-capacitance sensor, now defeated by exchanging side ports 170
Enter alternating current, convert alternating current can be direct current by four quadrant running power converter 140, be by direct current side ports 110
Energy storage device charges；When energy storage device is powered for regional power grid, pass through the input dc power of direct current side ports 110, four-quadrant fortune
DC power conversion can be alternating current by row power converter 140, be powered by exchanging side ports 170 for regional power grid.
In above process, DC side electric current can produce secondary pulsation, and DC voltage-stabilizing resonance circuit 130 is used to eliminate secondary
Pulsation, can improve the service life of energy storage device；DC power conversion is being alternating current by four quadrant running power converter 140
The course of work in, the opening and closing of its internal switch device can produce high-frequency harmonic, and ac filter circuit 150 is used to filter out harmonic high frequency
Ripple so that the electric current and voltage of exchange side ports output can meet the grid-connected requirement of regional power grid.
It can be seen that, the power-converting device shown in Fig. 1, by direct current side ports sequentially connected, direct current pre-charge circuit, straight
Flow voltage stabilizing resonance circuit, four quadrant running power converter, ac filter circuit, exchange pre-charge circuit, exchange side ports structure
Into power-converting device, and the current-limiting resistance quantity of circuit is accessed in direct current pre-charge circuit by adjusting respectively and preliminary filling is exchanged
The current-limiting resistance quantity that circuit is accessed in circuit to carry out current limliting to DC side electric current and ac-side current.The technical scheme makes
Power-converting device direct current side ports and exchange voltage that side ports can access in a wider scope so that by the electricity
The application environment of force conversion system is widened significantly, such as applied to the voltage pulsation in micro-capacitance sensor, being adapted to regional power grid, tool
There is good stability, internal components are hardly damaged.
Fig. 2-a show the circuit diagram of the direct current pre-charge circuit according to the utility model one embodiment.Such as Fig. 2-a institutes
Show, direct current pre-charge circuit 120 includes：N number of current-limiting resistance (R1、R2……Rn) and N+1 switch (K, K1、K2……Kn).Its
In, N number of current-limiting resistance (R1、R2……Rn) in parallel with a switch (K), and each current-limiting resistance switchs the (R that connects with one1
With K1Series connection, R2With K2Series connection ... RnWith KnSeries connection).
Fig. 2-b show the circuit diagram of the exchange pre-charge circuit according to the utility model one embodiment.Such as Fig. 2-b institutes
Show, exchange pre-charge circuit 160 includes：M current-limiting resistance (R1、R2……Rm) and N+1 switch (K, K1、K2……Km).Its
In, M current-limiting resistance (R1、R2……Rm) in parallel with a switch (K), and each current-limiting resistance switchs the (R that connects with one1
With K1Series connection, R2With K2Series connection ... RmWith KmSeries connection).
Wherein, the quantity of current-limiting resistance access circuit can be according to the size of current-limiting resistance, external voltage and internal components
Performance is selected.For example, to protect the electric capacity in DC voltage-stabilizing resonance circuit 130 not punctured by high current, it is known that electric capacity
Tolerance electric current is 2A, and it is 10V that direct current, which surveys external voltage, then direct current pre-charge circuit 120 needs the total current-limiting resistance accessed to be 5
Ω.If preset current-limiting resistance is 5 Ω in direct current pre-charge circuit 120, then only need to one switch of closure (for example
K1), rest switch is remained open, you can ensure that electric capacity will not be damaged.And just because of in direct current pre-charge circuit 120
Multiple current-limiting resistances are prefixed, can be adjusted according to external voltage, thus can ensure that power-converting device 100 can be answered
Environment is more wide in range.
Fig. 3 shows a kind of circuit diagram of DC voltage-stabilizing resonance circuit 130 according to the utility model one embodiment.Such as
Shown in Fig. 3, DC voltage-stabilizing resonance circuit 130 includes：LC series resonant circuits, including inductance L1, electric capacity C1；And connected with LC
Resonance circuit voltage regulation capacitor C in parallel2.Ac filter circuit 150 is LC types filter circuit or LCL type filter circuit, can be with
Selected according to demand.
In an one embodiment of the present utility model, the access area of exchange side ports 170 of power-converting device 100
Power network, the resonant frequency of DC voltage-stabilizing resonance circuit 130 is set as 2 times of regional power grid output voltage frequency.In the embodiment
The output voltage of regional power grid is 220V single-phase alternating currents, and four quadrant running power converter 140 uses monophasic pulses if rectification, if
Exchange side ports 170 output voltage be：uac=Uac·sin(wt)
Wherein, UacFor the peak value of output voltage, w is the angular frequency of output voltage.Assuming that output unit power factor (power
Factor is that 1), then output current can be expressed as：iac=Iac·sin(wt).Wherein, IacFor the peak value of output current.
Exchange is in series between side ports 170 filters with exchange because four quadrant running power converter 140 exchanges outlet side
Wave circuit 150, ac filter circuit 150 includes inductance, therefore four quadrant running power converter 140 exchanges the electricity of outlet side
Pressure is by UacVoltage UL on inductance is vector superposed to be formed, as shown in fig. 6, therefore, the exchange of four quadrant running power converter 140
Side voltage can be expressed as：Wherein, α is the phase angular displacement of inductance both sides voltage.
DC voltage ripple content very little, can be approximated to be complete DC voltage, is set to Udc, four quadrant running electric power
Very little is lost in converter 140, and it can be seen from law of conservation of energy, the input and output of four quadrant running power converter both sides are instantaneous
Power is approximately consistent, i.e.,：uout×iac=Udc×idc。
Summary, DC side electric current idc can be obtained：
It can be seen from above formula, in DC side electric current, except DC component, also comprising twice alternating current voltage frequency
Pulsation.Due to output voltage of the alternating voltage for exchange side ports 170, the output voltage of regional power grid is that is to say, therefore be
The secondary pulsation is absorbed, the resonant frequency of DC voltage-stabilizing resonance circuit 130 need to be set as regional power grid output voltage frequency
2 times.
Fig. 4 shows the structural representation of the four quadrant running power converter 140 according to the utility model one embodiment
Figure, as shown in figure 4, four quadrant running power converter 140 is full-bridge type topological structure, including：Four full control property switching devices
IGBT1, IGBT2, IGBT3, IGBT4, wherein, each full control property switching device is also parallel with high frequency capacitance (C1, C2, C3, C4).
Full control property switching device has selected IGBT (Insulated Gate Bipolar Transistor, insulated gate in the present embodiment
Bipolar transistor), IGCT (Integrated Gate Commutated can be also replaced with other embodiments
Thyristors, integrated gate commutated thyristor) etc. other full control property switching devices.High frequency capacitance in parallel can effectively absorb
The due to voltage spikes that full control property switching device is produced when being switched on or off.
In one embodiment of the present utility model, the device shown in Fig. 1 also includes：Controller 180, including with four-quadrant
The first port 181 that operation power converter 140 is connected, is converted to direct current for exporting control instruction or the general of alternating current
Alternating current is converted to the control instruction of direct current.
In one embodiment of the present utility model, in said apparatus, controller 180 also includes：Second port 182, is used
Sampled in the output voltage of the regional power grid connected to micro-capacitance sensor；3rd port 183, for the region obtained when sampling
When the output voltage of power network is outside the first preset range, grid-connected between output control micro-capacitance sensor and regional power grid switches off connection
Instruction so that micro-capacitance sensor be in off-network pattern.
First preset range can correspondingly be set, for example, 10kV and following three-phase according to the voltage of local area power network
Admissible deviation of supply volt- age is ± the 7% of rated voltage；220V single phase power supply voltages tolerance is the+7%- of rated voltage
10%.If the output voltage for obtained regional power grid of sampling exceeds the first preset range, illustrate that regional power grid there may be event
Barrier, can also generate fault cues signal according to the sampled voltage and be exported.
In one embodiment of the present utility model, in said apparatus, controller 180 also includes：4th port 184,
Five ports 185, the 6th port 186, the 7th port 187, the 8th port 188；Controller 180, is additionally operable to adopt in second port 182
When the output voltage for the regional power grid that sample is obtained is in the first preset range, the output electricity of the regional power grid obtained according to sampling
Pressure, is exported the instruction of the current-limiting resistance incoming transport pre-charge circuit of respective numbers by the 4th port 184；In respective numbers
When current-limiting resistance incoming transport pre-charge circuit reaches the first delay time, by fifth port 185 to the straight of power-converting device
DC voltage between stream pre-charge circuit 120 and DC voltage-stabilizing resonance circuit 130 is sampled；The DC voltage obtained when sampling
When the difference of the output voltage of the regional power grid obtained with sampling is outside the second preset range, disconnection is exported by the 6th port 186
The instruction of all circuits in power-converting device；When the output for the regional power grid that the DC voltage that sampling is obtained and sampling are obtained
It is all except what is accessed in exchange pre-charge circuit by the outputting cutting of the 4th port 184 when the difference of voltage is in the second preset range
The instruction of current-limiting resistance, is sampled by the 7th port 187 to the output voltage of the energy storage device in micro-capacitance sensor；According to sampling
The output voltage of the energy storage device arrived, is exported the current-limiting resistance access direct current precharge electricity of respective numbers by the 8th port 188
The instruction on road；When the current-limiting resistance access direct current pre-charge circuit of respective numbers reaches the second delay time, by fifth port
185 sample to the DC voltage between direct current pre-charge circuit 120 and DC voltage-stabilizing resonance circuit 130 again, when new sampling
When the difference of the output voltage for the energy storage device that obtained DC voltage is obtained with sampling is outside the 3rd preset range, by the 6th end
The output of mouth 186 disconnects the instruction of all circuits in power-converting devices；The DC voltage obtained when newly sampling is obtained with sampling
Energy storage device output voltage difference in the 3rd preset range when, by the outputting cutting of the 8th port 188 except direct current be pre-charged
The instruction of all current-limiting resistances accessed in circuit.
Each port of controller 180 is not known identifies in Fig. 1 in above-described embodiment.The above-mentioned operation logic of controller can
With burning on core processor, core processor can arbitrarily be chosen from the digital signal processors such as MCU, DSP are chosen, this
Utility model is not restricted to this.For example, choosing TI DSP F2812 as the core processor of controller.In above-described embodiment
Although illustrate only the output to DC voltage, AC between direct current pre-charge circuit 120 and DC voltage-stabilizing resonance circuit 130
Voltage etc. is sampled, but it is also possible to other information of sampling according to demand, for example, DC side electric current Idc, ac-side current Iac、
In ac filter circuit 150 inductive current IL, capacitance current IC, ac filter circuit 150 with exchange between pre-charge circuit 160
Alternating voltage Uac, etc., the voltage U between direct current pre-charge circuit 120 and DC voltage-stabilizing resonance circuit 130dc, DC side electric current
IdcIt can be used for constant pressure and the constant-current charge control of energy storage device；Inductive current IL can as controller electric current loop feedback letter
Number, capacitance current IC is impedance-compensated as simulated capacitance, to reduce the ripple of output current；Ac filter circuit 150 with exchange
Alternating voltage U between pre-charge circuit 160acIt is used as the feedback signal of master controller Voltage loop, ac-side current IacIt is used as electric power
The measurement signal of converting means output current.
With reference in above-described embodiment, the pre-charge process of power-converting device 100 becomes apparent from.Filled with power converter
Exemplified by the direct current side ports and exchange side ports for putting 100 are connected respectively with the energy storage device and regional power grid in micro-capacitance sensor respectively,
Specifically：
(1) sample area line voltage Ugrid first, judges whether it is in normal threshold range, if beyond just
Normal threshold value, then judge electric network fault, disconnects the grid-connected switch STS between micro-capacitance sensor and regional power grid, points out failure, and display can only
Into off-network mode of operation.
(2) if Ugrid is in the range of normality threshold, according to the size of voltage, connect in exchange pre-charge circuit 160
Enter the current-limiting resistance of respective number, it is ensured that in the mains voltage range of wide scope, the size of pre-charge current is all in setting
Scope, so as to ensure the safety of device.
(3) delay (the first delay time) is entered after access current-limiting resistance, it is ensured that ac filter circuit 150 and DC voltage-stabilizing
Electric capacity in resonance circuit 130 all completes charging, and delay terminates post-sampling DC voltage Udc.First delay time can basis
The charging performance of electric capacity is configured.
(4) U is judgeddcWhether reasonable level (with regional power grid voltage close, almost unanimously) is had increased to, if without if
Show there is failure in power-converting device 100, all switches of breaking inner circuit, device is shut down, on the contrary then cut off current limliting
Resistance, closed circuit, into next step.
(5) output voltage of sampling energy storage device, according to voltage swing, respective counts are accessed in direct current pre-charge circuit 120
Purpose current-limiting resistance, it is ensured that in the energy storage device voltage range of wide scope, the model of the size of pre-charge current all in setting
Enclose, so as to ensure the safety of device.
(6) after the access of direct current pre-charge circuit 120 current-limiting resistance, into delay (the second delay time), it is ensured that direct current is steady
The electric capacity charging complete in resonance circuit 130, delay is pressed to judge DC voltage U after terminatingdcWhether new reasonable water is risen to
Flat (suitable with the output voltage of energy storage device).Similarly, the second delay time can be according in DC voltage-stabilizing resonance circuit 130
The charging performance of electric capacity is configured.
(7) if UdcCondition is met, then cuts off current-limiting resistance, closed circuit, whole pre-charge process is completed, four quadrant running
Power converter 140 can receive controller 180 instruction startup optimization (progress hands over-straight conversion or straight-alternation change, i.e. energy storage
The charge/discharge of device), conversely, then showing there is failure in power-converting device 100, disconnect all circuits in device, dress
Put shutdown.
Wherein, the instruction that controller 180 is exported to four quadrant running circuit converter 140 can be PWM (Pulse
Width Modulation, pulse width modulation) drive signal, access/excision to current-limiting resistance is referred to Fig. 2-a and figure
2-b, switchs the amount of outputing of control to AC/DC pre-charge circuit output relay respectively.
Fig. 5 shows a kind of structural representation of micro-capacitance sensor according to the utility model one embodiment, as shown in figure 5,
Micro-capacitance sensor 500 includes：
Grid-connected switch 510, ac bus 520, the power-converting device 100 in such as above-mentioned any embodiment, energy storage device
530th, distributed power source 540, locally load 550, multiple branch switch 560；Wherein, ac bus 520 passes through grid-connected switch 510
The regional power grid electrical connection being connected with micro-capacitance sensor；Local load 550 is electrically connected by branch switch 560 with ac bus 520；
Each power supply 541 in distributed power source 540 is electrically connected by branch switch 560 with ac bus 520 respectively；Power-converting device
100 outer end of direct current side ports 110 is electrically connected with energy storage device 530, the outer end of exchange side ports 170 of power-converting device 100
Electrically connected by branch switch 560 with ac bus 520.
In actual applications, regional power grid is generally Medial ＆ Low Voltage Power Network, from single-phase 220V to three-phase 380V to 35KV.
Can be with setting area line voltage sampled point between grid-connected switch 510 and regional power grid, the controller with power-converting device 100
180 second port 182 is connected, to realize that its output voltage to regional power grid is sampled.Ac bus (AC BUS) 520
The distributed power source 540 being connected to inside micro-capacitance sensor 500 and local load 550, are the transmission channels of AC energy.
Micro-capacitance sensor 500 is in off-grid operation, it is necessary to provide the reference data of voltage and frequency by itself, it is ensured that whole net
The normal work of network, now energy storage device 530 main power source is will act as to bear the important task of burning voltage and frequency, energy storage dress
Put 500 as micro-capacitance sensor voltage source, remaining distributed power source 540 then as current source according to energy storage device export voltage and
Frequency carrys out work.Distributed power source 540 is the main power generation part in micro-capacitance sensor 500, can unidirectionally be presented to ac bus 520
Electricity；Power-converting device 100 is connected between energy storage device 530 and ac bus 520, it is possible to achieve energy storage device 530 it is straight
Stream electricity is changed to the electric energy between the alternating current of ac bus 520, and the energy between energy storage device 530 and ac bus 520
Transmitted in both directions is measured, i.e., generates electricity or is charged to energy storage device 530 to micro-capacitance sensor 500；Energy storage device 530, which is served, realizes micro-capacitance sensor
500 electric energy smoothly export the cistern effect for suppressing voltage pulsation and peak load shifting.
Distributed power source 540 serves as the role of current source in micro-capacitance sensor 500, area when being incorporated into the power networks with micro-capacitance sensor 500
Output current on the basis of the voltage-frequency signal of main power source when domain power network or off-grid operation, distributed power source 540 include but
It is not limited to distributed photovoltaic power generation system, wind generator system.In a distributed manner exemplified by photovoltaic system, distributed photovoltaic system master
To be made up of M photovoltaic DC-to-AC converter and N number of photovoltaic array, photovoltaic array is corresponded with photovoltaic DC-to-AC converter respectively, photovoltaic array
The direct current of output, is fed in the ac bus 520 of micro-capacitance sensor 500 after photovoltaic DC-to-AC converter inversion is exchange.
In one embodiment of the present utility model, in the micro-capacitance sensor shown in Fig. 5, grid-connected switch 510 and/or branch switch
560 are realized with following any device：Grid-connected contactor, air switch, static switch.
Each switch in above-mentioned micro-capacitance sensor can also be realized and be automatically controlled by controlling manually.Of the present utility model
In one embodiment, the micro-capacitance sensor shown in Fig. 5 also includes：Micro-capacitance sensor central controller 570, for being sent to branch switch 560
Closure/open command, the correspondingly closure of controlling brancher switch 560 or disconnection；For to power-converting device 100 send start/
Halt instruction, correspondingly controls startup/stopping of power-converting device 100；And filled for being sent to power-converting device 100
Electricity/electric discharge instruction, control power-converting device 100 carries out charge/discharge to energy storage device 530.
In summary, the technical solution of the utility model, electricity is pre-charged by the direct current side ports that sequentially connect, direct current
Road, DC voltage-stabilizing resonance circuit, four quadrant running power converter, ac filter circuit, exchange pre-charge circuit, exchange side
Mouth constitutes power-converting device, and accesses the current-limiting resistance quantity of circuit in direct current pre-charge circuit by adjusting respectively and exchange
The current-limiting resistance quantity that circuit is accessed in pre-charge circuit to carry out current limliting to DC side electric current and ac-side current.The technical side
Case causes the power-converting device direct current side ports voltage accessible with side ports are exchanged in a wider scope, so that will
The application environment of the power-converting device is widened significantly, such as applied to the voltage wave in micro-capacitance sensor, being adapted to regional power grid
Dynamic, with good stability, internal components are hardly damaged.
The utility model is limited it should be noted that above-described embodiment is illustrated rather than to the utility model,
And those skilled in the art can design alternative embodiment without departing from the scope of the appended claims.In right
It is required that in, any reference symbol between bracket should not be configured to limitations on claims.Word "comprising" is not arranged
Except there is element or step not listed in the claims.Word "a" or "an" before element does not exclude the presence of many
Individual such element.The utility model can be by means of including the hardware of some different elements and by means of properly programmed
Computer is realized.In if the unit claim of equipment for drying is listed, several in these devices can be by same
One hardware branch is embodied.The use of word first, second, and third does not indicate that any order.Can be by these lists
Word is construed to title.
Claims (10)
1. a kind of power-converting device, it is characterised in that the device includes：
The direct current side ports that sequentially connect, direct current pre-charge circuit, DC voltage-stabilizing resonance circuit, four quadrant running power converter
Device, ac filter circuit, exchange pre-charge circuit, exchange side ports；
The direct current pre-charge circuit includes multiple current-limiting resistances, for carrying out current limliting to DC side electric current；Wherein, circuit is accessed
Current-limiting resistance quantity can adjust；
The exchange pre-charge circuit includes multiple current-limiting resistances, for carrying out current limliting to ac-side current；Wherein, circuit is accessed
Current-limiting resistance quantity can adjust.
2. device as claimed in claim 1, it is characterised in that
The direct current pre-charge circuit includes：N number of current-limiting resistance and N+1 switch, wherein, N number of current-limiting resistance and one
Switch in parallel, and each current-limiting resistance is connected with a switch；
The exchange pre-charge circuit includes：M current-limiting resistance and M+1 switch, wherein, the M current-limiting resistance and one
Switch in parallel, and each current-limiting resistance is connected with a switch；
Wherein, M and N is natural number.
3. device as claimed in claim 1, it is characterised in that
The DC voltage-stabilizing resonance circuit includes：LC series resonant circuits and voltage regulation capacitor in parallel therewith；
The ac filter circuit is LC types filter circuit or LCL type filter circuit.
4. device as claimed in claim 1, it is characterised in that
The four quadrant running power converter is full-bridge type topological structure, including：Four full control property switching devices, wherein, often
Individual full control property switching device is also parallel with high frequency capacitance.
5. device as claimed in claim 1, it is characterised in that the device also includes：
Controller, including the first port being connected with the four quadrant running power converter, change direct current for exporting
Control instruction for alternating current or the control instruction that alternating current is converted to direct current.
6. device as claimed in claim 5, it is characterised in that the controller also includes：
Second port, the output voltage of the regional power grid for being connected to micro-capacitance sensor is sampled；
3rd port, for when the output voltage of regional power grid that sampling is obtained is outside the first preset range, output control institute
State the grid-connected instruction for switching off connection between micro-capacitance sensor and regional power grid so that the micro-capacitance sensor is in off-network pattern.
7. device as claimed in claim 6, it is characterised in that the controller also includes：4th port, fifth port,
Six ports, the 7th port, the 8th port；
The controller, is additionally operable to sample the obtained output voltage of regional power grid in the first preset range in the second port
When interior, the output voltage of the regional power grid obtained according to sampling is exported the current-limiting resistance of respective numbers by the 4th port
The instruction of the access exchange pre-charge circuit；The is reached in the current-limiting resistance access exchange pre-charge circuit of respective numbers
During one delay time, by the fifth port to the direct current between the direct current pre-charge circuit and the DC voltage-stabilizing resonance circuit
Voltage is sampled；When the difference of the obtained DC voltage of sampling and the output voltage of the regional power grid sampled and obtained is the
When outside two preset ranges, the instruction for disconnecting all circuits in the power-converting device is exported by the 6th port；When adopting
When the difference of the output voltage for the regional power grid that the DC voltage that sample is obtained is obtained with the sampling is in the second preset range, by
The 4th port outputting cutting is except the instruction of all current-limiting resistances accessed in the exchange pre-charge circuit, by the 7th end
Mouth is sampled to the output voltage of the energy storage device in the micro-capacitance sensor；The output electricity of the energy storage device obtained according to sampling
Pressure, the instruction that the current-limiting resistance of respective numbers is accessed to the direct current pre-charge circuit is exported by the 8th port；Corresponding
When the current-limiting resistance access direct current pre-charge circuit of quantity reaches the second delay time, by the fifth port again to institute
The DC voltage stated between direct current pre-charge circuit and the DC voltage-stabilizing resonance circuit is sampled, the direct current obtained when newly sampling
When the difference of the output voltage for the energy storage device that voltage is obtained with the sampling is outside the 3rd preset range, by the 6th port
Output disconnects the instruction of all circuits in the power-converting device；The DC voltage obtained when newly sampling is sampled with described
When the difference of the output voltage of the energy storage device arrived is in the 3rd preset range, the direct current is removed by the 8th port outputting cutting
The instruction of all current-limiting resistances accessed in pre-charge circuit.
8. a kind of micro-capacitance sensor, it is characterised in that the micro-capacitance sensor includes：
Grid-connected switch, ac bus, the power-converting device as any one of claim 1-7, energy storage device, distribution
Power supply, local load, multiple branch switch；
Wherein, the ac bus is electrically connected by the grid-connected regional power grid being connected with the micro-capacitance sensor that switchs；
The local load is electrically connected by branch switch with the ac bus；
Each power supply in the distributed power source is electrically connected by branch switch with the ac bus respectively；
The direct current side ports outer end of the power-converting device is electrically connected with the energy storage device, the friendship of the power-converting device
Stream side ports outer end is electrically connected by branch switch with the ac bus.
9. micro-capacitance sensor as claimed in claim 8, it is characterised in that the grid-connected switch and/or branch switch are appointed with following
A kind of device is realized：Grid-connected contactor, air switch, static switch.
10. micro-capacitance sensor as claimed in claim 8, it is characterised in that the micro-capacitance sensor also includes：
Micro-capacitance sensor central controller, for sending closure/open command to the branch switch, correspondingly controls the branch road to open
Close and close or disconnect；For sending startup/halt instruction to the power-converting device, the power converter is correspondingly controlled to fill
Startup/the stopping put；And for sending charge/discharge instruction to the power-converting device, control the power converter dress
Put and charge/discharge is carried out to the energy storage device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621250413.6U CN206461525U (en) | 2016-11-18 | 2016-11-18 | A kind of power-converting device and micro-capacitance sensor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621250413.6U CN206461525U (en) | 2016-11-18 | 2016-11-18 | A kind of power-converting device and micro-capacitance sensor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN206461525U true CN206461525U (en) | 2017-09-01 |
Family
ID=59692832
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201621250413.6U Withdrawn - After Issue CN206461525U (en) | 2016-11-18 | 2016-11-18 | A kind of power-converting device and micro-capacitance sensor |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN206461525U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106452110A (en) * | 2016-11-18 | 2017-02-22 | 广州智光电气股份有限公司 | Power conversion apparatus and microgrid |
-
2016
- 2016-11-18 CN CN201621250413.6U patent/CN206461525U/en not_active Withdrawn - After Issue
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106452110A (en) * | 2016-11-18 | 2017-02-22 | 广州智光电气股份有限公司 | Power conversion apparatus and microgrid |
| CN106452110B (en) * | 2016-11-18 | 2019-01-01 | 广州智光电气股份有限公司 | A kind of power-converting device and micro-capacitance sensor |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| JP6951542B2 (en) | Chain multi-port grid connection interface device and control method | |
| US10523131B2 (en) | Reconfigurable MMC sub-module unit and control unit thereof | |
| CN104319816B (en) | A kind of light storage alternating current-direct current mixing micro-grid system and control method thereof | |
| CN101345419B (en) | Series voltage quality regulator and fast investment and cutting method | |
| CN110445400A (en) | The modular multi-level converter and control method of multiport DC power flow control | |
| CN102969882B (en) | Starting method of modular multi-level flexible direct-current transmission converter | |
| CN207459728U (en) | A kind of accumulation energy type multiport electric power electric transformer | |
| CN107732954B (en) | Online input control method and device for voltage source converter unit | |
| WO2012010053A1 (en) | Transformer-less static synchronous compensator (statcom) topological structure based on modular multilevel converter (mmc) | |
| WO2015143744A1 (en) | Multi-port dc-dc autotransformer and application therefor | |
| CN103001242A (en) | HVDC (high voltage direct current controller) and UPFC (unified power flow controller) system based on modularized multi-level converter | |
| CN103066587A (en) | Optimal configuration method of modular multi-level flexible direct current system | |
| CN106452110B (en) | A kind of power-converting device and micro-capacitance sensor | |
| CN105191091A (en) | Voltage source converter | |
| CN102025165A (en) | Transformerless battery energy storing topological structure | |
| Yu et al. | New submodule circuits for modular multilevel current source converters with DC fault ride through capability | |
| CN203800619U (en) | Grid-connected connection circuit for three-phase energy storage current transformer | |
| CN103956763A (en) | Flexible DC converter station | |
| CN206461525U (en) | A kind of power-converting device and micro-capacitance sensor | |
| CN108879789A (en) | Bidirectional energy-storage Variable flow control device and method | |
| CN203103884U (en) | DC high-current ice melting apparatus with STSTCOM function | |
| CN202930956U (en) | Unified power flow controller used in unbalanced system | |
| CN104518686B (en) | Method and system for driving motor | |
| CN202535087U (en) | Unified power flow controller based on modular multilevel converter structure | |
| CN201774259U (en) | Transformerless STATCOM topological structure based on MMC |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20170901 Effective date of abandoning: 20190101 |