CN209233489U - A kind of multistage contravariant equipment for the grid-connected compensation of power distribution network - Google Patents
A kind of multistage contravariant equipment for the grid-connected compensation of power distribution network Download PDFInfo
- Publication number
- CN209233489U CN209233489U CN201822276824.8U CN201822276824U CN209233489U CN 209233489 U CN209233489 U CN 209233489U CN 201822276824 U CN201822276824 U CN 201822276824U CN 209233489 U CN209233489 U CN 209233489U
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- Prior art keywords
- relay
- grid
- distribution network
- power distribution
- compensation
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/20—Active power filtering [APF]
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/30—Reactive power compensation
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/40—Arrangements for reducing harmonics
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Abstract
The utility model relates to a kind of multistage contravariant equipments for the grid-connected compensation of power distribution network, including multiple successively cascade inverters, and multiple it is respectively used to control each switching device inverter investment and launched, the number of switching device and the number of inverter are consistent, and each switching device is connected with corresponding inverter respectively.Compared with prior art, multiple groups inversion package can be closed cascade inverter mode using multi-channel switcher by the utility model, its effect is can to give appropriate compensation ability when power distribution network demand higher peak compensation, can be used for the serious compensation scene of harmonic wave ring.
Description
Technical field
The utility model relates to a kind of electric filtering fields, more particularly, to a kind of multistage for the grid-connected compensation of power distribution network
Contravariant equipment.
Background technique
Harmonic wave and reactive power often occurs during power distribution network is grid-connected, it is therefore desirable to the inverter with compensation function, and
Its compensation ability and compensation characteristic can not be changed the grid-connected compensation topology of traditional power electronics substantially after the design is completed, if you need to obtain
It obtains higher compensation ability and just needs to redesign new topology, or replacement switch element, outputting inductance etc..
Such as Chinese patent CN109038652A disclose it is a kind of based on modulation sliding fourier transfonn it is multi-functional grid-connected
Inverter harmonic selectivity compensation method, comprising: S1, sample interception voltage signal from power grid by multi-functional gird-connected inverter
With current signal；S2, it is calculated according to the voltage signal intercepted and acquires fundamental wave reference current S3, according to the electric current letter intercepted
Number, using modulation sliding fourier transfonn method calculating acquire harmonic reference current S4, by the fundamental wave reference current with it is humorous
Wave reference current addition obtain final reference electric current i*, and according to the final reference electric current i*, use multi-functional parallel network reverse
Device carries out active and harmonic compensation.The utility model realizes in such a way that multiple multi-functional gird-connected inverters are in parallel to micro- electricity
" in-situ balancing " and " local compensation " of harmonic wave and fundamental wave, improves the power quality of micro-capacitance sensor entirety in netting.However, power distribution network
The current application load feature of network is complicated, according to industry, there is very large deviation on region and load nature of electricity consumed, so often compensation is total
It has very big difference to peak demand when requirement is identical, can differ as many as 2~4 times, and the compensation by replacing different size is set
It is standby not to be able to satisfy load increasing demand.
Utility model content
The purpose of this utility model is exactly to provide a kind of for distribution to overcome the problems of the above-mentioned prior art
Net the multistage contravariant equipment of grid-connected compensation.
The purpose of this utility model can be achieved through the following technical solutions:
A kind of multistage contravariant equipment for the grid-connected compensation of power distribution network, including multiple successively cascade inverters, Yi Jiduo
It is a to be respectively used to control each switching device inverter investment and launched, the number of the switching device and the number one of inverter
It causes, and each switching device is connected with corresponding inverter respectively.
The switching device include the first relay, the second relay, third relay, the 4th relay, controller, every
Leave pass, driving motor and insulated connecting rod, the shaft of disconnecting switch is connect and in the same direction with insulated connecting rod with insulated connecting rod
Rotation, the output axis connection of the insulated connecting rod and driving motor, and rotated with the output shaft synchronous, the motor is just
Pole passes through the first relay and the 4th relay respectively and the anode of power supply connects, and cathode passes through the second relay and third respectively
The connection of the cathode of relay and power supply, first relay, the second relay, third relay and the 4th relay coil are equal
It is connect with the controller.
The switching device further includes first stroke switch and second stroke switch, first stroke switch with first after
Electric appliance series connection, the second stroke switch are connected with third relay.
The inverter is multi-electrical level inverter.
The inverter includes main circuit and DSP control circuit, and the main circuit is connected between power grid and sensitive load,
Including the energy-storage units, MMC inversion unit and capacitive coupling element being connected in parallel with each other, the DSP control circuit includes DSP control
Coremaking piece and the voltage and current sample circuit being connect respectively with DSP control chip, display input circuit and protection circuit.
It include upper and lower two bridge arms in the single-phase topological structure of the MMC inversion unit, each bridge arm includes concatenated
Multiple identical submodules of structure and a bridge arm reactor.
Compared with prior art, the utility model has the following beneficial effects:
1) multiple groups inversion package can be closed to cascade inverter mode using multi-channel switcher, effect is can to need in power distribution network
Appropriate compensation ability can be given by asking when higher peak compensation, can be used for the serious compensation scene of harmonic wave ring.
2) multi-stage cascade of inversion packet can be exclusively used in the demand of peak value, be switched by the adjustment of multi-channel switcher, can
To improve the utilization rate of inversion packet to greatest extent, that is, when not needing peak value demand, inversion packet can be set as shunt compensation；
Multiple or all inversion packets can be cascaded when needing peak value to compensate.
3) single power supply is realized as driving motor power supply using four relays, that realizes driving motor rotates and reverse control
System, to realize the investment for inverter and release control.
4) electrical Interference is avoided using insulated connecting rod, improves security performance.
5) Regulation Control part is configured, using MMC type inversion topological, the degree of modularity is high, Yi Tuozhan, convenient for integrated,
Redundancy Design is simple, and the switching frequency and switching loss of submodule are small, and number of modules is more, and the sinusoidal degree of output voltage wave is got over
Height, status of the submodule in every phase is identical, and switching device selection is convenient；With public DC bus, four-quadrant can be realized
Limit operation, switching device selects wholly-controled device, to realize the two-way flow of energy.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of the utility model；
Fig. 2 is the structural schematic diagram of switching device；
Fig. 3 is the circuit diagram of switching device relay part；
Wherein: 1, inverter, 2, switching device, 21, disconnecting switch, 22, driving motor, 23, insulated connecting rod, K1,
One relay, K2, the second relay, K3, third relay, K4, the 4th relay, E, power supply.
Specific embodiment
The utility model is described in detail in the following with reference to the drawings and specific embodiments.The present embodiment is with the utility model
Implemented premised on technical solution, the detailed implementation method and specific operation process are given, but the guarantor of the utility model
Shield range is not limited to the following embodiments.
A kind of multistage contravariant equipment for the grid-connected compensation of power distribution network, as shown in Figure 1, including multiple successively cascade inversions
Device and it is multiple be respectively used to control each switching device inverter investment and launched, the number of switching device and inverter
Number is consistent, and each switching device is connected with corresponding inverter respectively.
Multiple groups inversion package can be closed to cascade inverter mode using multi-channel switcher, effect is can be in power distribution network demand
Appropriate compensation ability can be given when higher peak compensation, can be used for the serious compensation scene of harmonic wave ring.Inversion packet
Multi-stage cascade can be exclusively used in the demand of peak value, switched by the adjustment of multi-channel switcher, can improve inversion to greatest extent
The utilization rate of packet, that is, when not needing peak value demand, inversion packet can be set as shunt compensation；It can be with when needing peak value
Multiple or all inversion packets is cascaded to compensate.
As shown in Figures 2 and 3, switching device includes the first relay, the second relay, third relay, the 4th relay
The shaft of device, controller, disconnecting switch, driving motor and insulated connecting rod, disconnecting switch connect with insulated connecting rod and with exhausted
Edge connecting rod rotates in same direction, the output axis connection of insulated connecting rod and driving motor, and rotates with output shaft synchronous, and motor is just
Pole passes through the first relay and the 4th relay respectively and the anode of power supply connects, and cathode passes through the second relay and third respectively
The cathode of relay and power supply connection, the first relay, the second relay, third relay and the 4th relay coil with control
Device connection processed.
Single power supply is realized as driving motor power supply using four relays, and that realizes driving motor rotates and reverse control
System, to realize the investment for inverter and release control.
Switching device further includes first stroke switch and second stroke switch, and first stroke switchs and the first relay string
Connection, second stroke switch are connected with third relay, and the motor after disconnecting switch movement in place may be implemented by travel switch
Automatic stalling can be grafted directly, therefore the application is no longer superfluous due to the mature application on projector curtain of this part
It states.
Inverter is multi-electrical level inverter, and inverter includes main circuit and DSP control circuit, main circuit be connected on power grid with
Between sensitive load, including the energy-storage units, MMC inversion unit and capacitive coupling element being connected in parallel with each other, DSP control circuit
Voltage and current sample circuit, display input circuit and the protection for controlling chip including DSP and being connect respectively with DSP control chip
Circuit.It include upper and lower two bridge arms in the single-phase topological structure of MMC inversion unit, each bridge arm includes concatenated multiple structure phases
Same submodule and a bridge arm reactor.
Claims (6)
1. a kind of multistage contravariant equipment for the grid-connected compensation of power distribution network, which is characterized in that including multiple successively cascade inversions
Device and multiple it is respectively used to control each switching device inverter investment and launched, the number and inversion of the switching device
The number of device is consistent, and each switching device is connected with corresponding inverter respectively.
2. a kind of multistage contravariant equipment for the grid-connected compensation of power distribution network according to claim 1, which is characterized in that described
Switching device includes the first relay, the second relay, third relay, the 4th relay, controller, disconnecting switch, driving
The shaft of motor and insulated connecting rod, disconnecting switch connect with insulated connecting rod and rotates in same direction with insulated connecting rod, described exhausted
The output axis connection of edge connecting rod and driving motor, and rotated with the output shaft synchronous, the anode of the motor passes through respectively
The anode connection of first relay and the 4th relay and power supply, cathode pass through the second relay and third relay and electricity respectively
The cathode in source connects, first relay, the second relay, third relay and the 4th relay coil with the control
Device connection.
3. a kind of multistage contravariant equipment for the grid-connected compensation of power distribution network according to claim 2, which is characterized in that described
Switching device further includes first stroke switch and second stroke switch, and the first stroke switch is connected with the first relay, institute
Second stroke switch is stated to connect with third relay.
4. a kind of multistage contravariant equipment for the grid-connected compensation of power distribution network according to claim 1, which is characterized in that described
Inverter is multi-electrical level inverter.
5. a kind of multistage contravariant equipment for the grid-connected compensation of power distribution network according to claim 4, which is characterized in that described
Inverter includes main circuit and DSP control circuit, and the main circuit is connected between power grid and sensitive load, including parallel with one another
Energy-storage units, MMC inversion unit and the capacitive coupling element of connection, the DSP control circuit include DSP control chip and divide
Voltage and current sample circuit, display input circuit and the protection circuit not connect with DSP control chip.
6. a kind of multistage contravariant equipment for the grid-connected compensation of power distribution network according to claim 5, which is characterized in that described
It include upper and lower two bridge arms in the single-phase topological structure of MMC inversion unit, each bridge arm includes that concatenated multiple structures are identical
Submodule and a bridge arm reactor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201822276824.8U CN209233489U (en) | 2018-12-29 | 2018-12-29 | A kind of multistage contravariant equipment for the grid-connected compensation of power distribution network |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201822276824.8U CN209233489U (en) | 2018-12-29 | 2018-12-29 | A kind of multistage contravariant equipment for the grid-connected compensation of power distribution network |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN209233489U true CN209233489U (en) | 2019-08-09 |
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ID=67510052
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201822276824.8U Active CN209233489U (en) | 2018-12-29 | 2018-12-29 | A kind of multistage contravariant equipment for the grid-connected compensation of power distribution network |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN209233489U (en) |
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2018
- 2018-12-29 CN CN201822276824.8U patent/CN209233489U/en active Active
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