CN217904033U - Wind-storage integrated converter with black start function and wind generating set - Google Patents
Wind-storage integrated converter with black start function and wind generating set Download PDFInfo
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- CN217904033U CN217904033U CN202221681860.2U CN202221681860U CN217904033U CN 217904033 U CN217904033 U CN 217904033U CN 202221681860 U CN202221681860 U CN 202221681860U CN 217904033 U CN217904033 U CN 217904033U
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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
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/70—Wind energy
- Y02E10/76—Power conversion electric or electronic aspects
Abstract
The utility model discloses an integrative converter is stored up to wind with black start function, including net side converter, machine side converter, PCS system unit, converter controller, the net side converter passes through transformer T1 and main circuit breaker QF and is connected with the electric wire netting, and the machine side converter is connected with aerogenerator, net side converter reaches the machine side converter passes through bus capacitor C2 and connects, PCS system unit includes PCS subassembly unit, energy storage unit, PCS controller, DC-AC power converter, auxiliary electric system unit and PCS auxiliary power supply, and the auxiliary electric system unit of this system gets the electricity in the energy storage unit, gets the electricity and does not adopt the transformer, and auxiliary electric system unit power is little, when normally being incorporated into the power networks, saves the cost; the breaker and the grid-connected switch are used for protecting the black start process, the energy storage unit is provided with the PCS auxiliary power supply, and the problem caused by overhigh black start charging is safely controlled.
Description
Technical Field
The utility model relates to a wind power generation technical field especially relates to an integrative converter is stored up to wind and wind generating set with black start function.
Background
In the wind power converter in the prior art, when a power grid is powered off and only a fan auxiliary power system is left, black start cannot be quickly realized, voltage and frequency references cannot be provided for the power grid, so that instability of the system is caused, the operation of a micro-grid is also lack of guarantee, the power grid can be quickly disconnected when in an isolated island, and stable grid-connected operation cannot be guaranteed;
chinese utility model patent 202010051875.X discloses a fan unit converter and utilizes its black start-up method of realization: comprises a variable current controller, a direct current bus, a supporting capacitor,
The Chopper circuit, the machine side converter, the network side converter and the standby power system; a direct current bus is connected between the machine side converter and the grid side converter, a supporting capacitor, a Chopper circuit and a standby power system are sequentially connected to the direct current bus from the machine side converter to the grid side converter, the machine side converter, the standby power system and the grid side converter are respectively connected with a variable current controller, the variable current controller is respectively in communication connection with a main control system and a grid-connected circuit breaker of the wind turbine generator, the grid-connected circuit breaker is connected with a boosting transformer and a generator of the wind turbine generator and is controlled by the variable current controller, and the variable current controller also monitors a machine side alternating current signal of the converter, a grid side alternating current signal of the converter and the voltage of the direct current bus; the standby power supply system is controlled by the converter controller under the condition of losing power of a power grid, the auxiliary power system of the wind turbine generator is supplied with power through the grid-side converter, electric energy required for establishing excitation voltage is provided for a generator rotor of the wind turbine generator through the machine-side converter, and in the black start process, the power supply capacity of the standby power supply system meets the power loss of the wind turbine generator in completing multiple black start processes.
The black start method has the following disadvantages:
the circuit breaker is used as a grid-connected switch, so that the service life of the circuit breaker is short and the operation times which can be borne by the circuit breaker are few;
2. a fuse is not added on the network side for protection, and the whole system can be burnt out when the battery charges the bus capacitor through the DC-DC converter too fast;
3. if the whole system is completely power-off, the PCS auxiliary power supply does not start the PCS controller, the standby power supply (battery) cannot start with the converter controller due to lack of a control instruction, the converter controller is not started, and the auxiliary power system has no effect at all;
4. short-circuit protection measures are not arranged between a converter bus and a battery, and actual engineering application is not met;
5. the auxiliary electric system gets electricity from the converter, the required energy power is larger, a transformer is required, the cost is higher, and the auxiliary electric system also works uninterruptedly, so that energy waste is caused.
SUMMERY OF THE UTILITY MODEL
The technical problem to be solved by the utility model is to provide a wind-storage integrated converter with black start function, the auxiliary electric system unit of the wind-storage integrated converter control system with black start function gets electricity in the energy storage unit, the electricity is not taken by the transformer, the power of the auxiliary electric system unit is small, when the grid is normally connected, the auxiliary electric system is in a dormant state, and the cost is saved; a breaker and a grid-connected switch are used between a power grid and a wind driven generator to protect a black start process, the energy storage unit is provided with a PCS auxiliary power supply, the PCS auxiliary power supply is used for starting a PCS controller when the system is completely power off, and then the converter controller is started, so that the safety performance is good; when the grid side of the converter is in black start, a fuse is added into a soft start loop, so that the problem caused by over-high charging in black start can be controlled more safely.
In order to solve the technical problem, the utility model provides a wind stores up integrative converter with black start function, including net side converter, machine side converter, converter controller, PCS system unit, the net side converter passes through transformer T1 and main circuit breaker QF and is connected with the electric wire netting, the machine side converter is connected with aerogenerator, net side converter and the machine side converter passes through bus capacitor C2 to be connected, the electric wire netting passes through transformer T1, main circuit breaker QF and is incorporated into the power networks contactor K3 and is connected with aerogenerator;
the PCS system unit comprises a PCS component unit, an energy storage unit, a PCS controller, a DC-AC power converter, an auxiliary electric system unit and a PCS auxiliary electric power supply, the PCS component unit is connected with the bus capacitor C2 through a first black start loop, the first black start loop comprises a direct current loop and a first soft start loop which are connected in parallel, the first soft start loop comprises a first soft start resistor R1 and a first soft start contactor K2 which are connected in series, and the direct current loop comprises a first direct current contactor K1;
the PCS component unit is connected with the energy storage unit, the energy storage unit is connected with the PCS auxiliary power supply, and the PCS auxiliary power supply is connected with the PCS controller;
the energy storage unit is connected with the auxiliary electric system unit through the DC-AC power converter, the auxiliary electric system unit is connected with the converter controller, the converter controller is connected with the main controller, and the DC-AC power converter, the auxiliary electric system unit, the converter controller and the main controller form a second black start loop;
when the power grid is powered off and the PCS system unit is electrified, the energy storage unit charges a bus capacitor C2 of the converter through the PCS assembly unit, after the bus voltage of the converter reaches a certain value, the grid-side converter inverts a reference grid voltage through the main circuit breaker QF, and then the generator-side converter inverts a voltage with the same frequency and phase as the reference grid voltage on the stator side of the generator, so that the wind driven generator is normally operated in a grid-connected mode.
Preferably, when the power grid and the PCS system units are all powered off, the PCS auxiliary power supply supplies power to the PCS controller, the PCS controller controls the energy storage unit to charge a bus capacitor C2 of the converter, and when the bus voltage of the converter reaches a certain value, the converter controller is activated to invert a power grid voltage by using the grid-side converter; the PCS controller controls the energy storage unit to supply power to the auxiliary electric system unit through the DC-AC power converter, and the converter controller controls the auxiliary electric system unit to supply power to the main controller; the grid-side converter inverts a reference power grid voltage through the main breaker QF, and inverts a voltage with the same frequency and phase as the reference power grid voltage at the stator side of the wind driven generator through the machine-side converter, so that the wind driven generator is normally operated in a grid-connected mode.
Preferably, after the wind turbine is normally operated in a grid-connected mode, the grid-side converter charges the energy storage unit through the PCS assembly unit.
Preferably, the network side converter comprises a network side filter inductor and a network side filter capacitor, and the machine side converter comprises a machine side filter inductor and a machine side RC filter component.
Preferably, the PCS component unit includes a DC-DC power converter, a DC filter inductor L1, a filter capacitor C1, a second DC contactor K4, a second soft start contactor K5, a second soft start capacitor R2, and an isolating switch QS; the energy storage unit is connected with the DC-DC power converter through the isolating switch QS, the second fuse FU2, the third fuse FU3, the direct current contactor K4, the direct current filter inductor and the filter capacitor C1 which are connected in series, one end of the direct current filter inductor L1 is connected with the filter capacitor C1, the other end of the filter capacitor C1 is connected with one input end of the DC-DC power converter, the second direct current contactor K4 is connected with a second soft start loop in parallel, and the second soft start loop comprises a second soft start contactor K5 and a second soft start capacitor R2 which are connected in series; and the output end of the DC-DC power supply converter is connected with a bus capacitor C2 of the converter through the first black start loop.
Preferably, the PCS module unit further includes a second fuse FU2 and a third fuse FU3, wherein positive and negative output terminals of the QS are respectively connected to one end of the second fuse FU2 and one end of the third fuse FU3, the other end of the second fuse FU2 is connected to the second DC contactor K4, and the other end of the third fuse FU3 is connected to an input terminal of the DC-DC power converter.
Preferably, the energy storage unit is a super capacitor battery or a lithium battery.
Preferably, the first soft start circuit further comprises a first fuse FU1, and the first fuse FU1 is connected in series with the first soft start contactor K2 and the first soft start resistor R1.
In order to solve the technical problem, the utility model also discloses a wind generating set adopts the aforesaid wind that has black start function stores up integrative converter.
After the system is adopted, the wind storage integrated converter with the black start function comprises a grid-side converter, a machine-side converter, a converter controller and a PCS system unit, wherein the grid-side converter is connected with a power grid through a transformer T1 and a main breaker QF, the machine-side converter is connected with a wind driven generator, the grid-side converter and the machine-side converter are connected through a bus capacitor C2, and the power grid is connected with the wind driven generator through the transformer T1, the main breaker QF and a grid-connected contactor K3; the PCS system unit comprises a PCS component unit, an energy storage unit, a PCS controller, a DC-AC power converter, an auxiliary electric system unit and a PCS auxiliary electric power supply, the PCS component unit is connected with the bus capacitor C2 through a first black start loop, the first black start loop comprises a direct current loop and a first soft start loop which are connected in parallel, the first soft start loop comprises a first soft start resistor R1 and a first soft start contactor K2 which are connected in series, and the direct current loop comprises a first direct current contactor K1; the PCS component unit is connected with the energy storage unit, the energy storage unit is connected with the PCS auxiliary power supply, and the PCS auxiliary power supply is connected with the PCS controller; the energy storage unit is connected with the auxiliary electric system unit through the DC-AC power converter, the auxiliary electric system unit is connected with the converter controller, the converter controller is connected with the main controller, and the DC-AC power converter, the auxiliary electric system unit, the converter controller and the main controller form a second black start loop; when a power grid is powered off and a PCS system unit is electrified, the energy storage unit charges a bus capacitor C2 of the converter through the PCS component unit, after the bus voltage of the converter reaches a certain value, the grid-side converter inverts a reference grid voltage through a main circuit breaker QF, and then the generator-side converter inverts a voltage with the same frequency and phase as the reference grid voltage on the stator side of a generator, so that the wind driven generator is normally operated in a grid-connected mode; the auxiliary power system unit of the wind-storage integrated converter control system with the black start function obtains power from the energy storage unit, a transformer is not adopted for power obtaining, the power of the auxiliary power system unit is low, and when the grid is normally connected, the auxiliary power system is in a dormant state, so that the cost is saved; a breaker and a grid-connected switch are used between a power grid and a wind driven generator to protect a black start process, the energy storage unit is provided with a PCS auxiliary power supply, the PCS auxiliary power supply is used for starting a PCS controller when the system is completely power off, and then the converter controller is started, so that the safety performance is good; when the grid side of the converter is in black start, a fuse is added in a soft start loop, so that the problem caused by over-high charging in black start can be more safely controlled.
Drawings
FIG. 1 is a schematic diagram of a fan set converter and a black start method implemented by the same in the prior art;
fig. 2 is a structural diagram of an integrated wind-storage converter with black start function according to the present invention;
fig. 3 is a structural diagram of a PCS system unit of the wind storage integrated converter with black start function of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more clearly understood, the present invention will be further described in detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Example one
Referring to fig. 2, fig. 2 is a structural diagram of an integrated wind storage converter with black start function according to the present invention;
the embodiment discloses a wind-storage integrated converter with a black start function, which comprises a grid-side converter 101, a machine-side converter 102, a converter controller 103 and a PCS system unit 40, wherein the grid-side converter 101 is connected with a power grid through a transformer T1 and a main breaker QF, the machine-side converter 102 is connected with a wind driven generator 20, the grid-side converter 101 and the machine-side converter 102 are connected through a bus capacitor C2, and the power grid is connected with the wind driven generator 20 through the transformer T1, the main breaker QF and a grid-connected contactor K3;
the PCS system unit 40 includes a PCS component unit 41, an energy storage unit 42, a PCS controller 43, a DC-AC power converter 45, an auxiliary electrical system unit 46, and a PCS auxiliary electrical power source 44, the PCS component unit is connected to the bus capacitor C2 through a first black start loop, the first black start loop includes a DC loop and a first soft start loop connected in parallel, the first soft start loop includes a first soft start resistor R1 and a first soft start contactor K2 connected in series, the DC loop includes a first DC contactor K1;
the PCS component unit 41 is connected with the energy storage unit 42, the energy storage unit 42 is connected with the PCS auxiliary power supply 44, and the PCS auxiliary power supply 44 is connected with the PCS controller 43;
the energy storage unit 42 is connected with the auxiliary electric system unit 46 through the DC-AC power converter, the auxiliary electric system unit 46 is connected with the converter controller 103, the converter controller 103 is connected with the main controller 50, and the DC-AC power converter 45, the auxiliary electric system unit 46, the converter controller 403 and the main controller 50 form a second black start loop;
when the power grid is out of power and the PCS system unit is electrified, the energy storage unit 42 charges the bus capacitor C2 through the PCS component unit 41, after the bus voltage of the converter reaches a certain value, the grid-side converter 101 inverts a reference grid voltage through the main circuit breaker QF, and inverts a voltage with the same frequency and phase as the reference grid voltage on the generator stator side through the machine-side converter 102, so that the wind driven generator 20 operates normally in a grid-connected manner.
When the power grid and the PCS system unit 40 are completely powered off, the PCS auxiliary power supply 44 supplies power to the PCS controller 43, the PCS controller 43 controls the energy storage unit 42 to charge the bus capacitor C2, and when the bus voltage of the converter reaches a certain value, the converter controller 103 is activated, and a power grid voltage is inverted by using the grid-side converter 101; the PCS controller 43 controls the energy storage unit 42 to supply power to the auxiliary electric system unit 46 through the DC-AC power converter 45, and the converter controller 103 controls the auxiliary electric system unit 46 to supply power to the main controller; the grid-side converter 101 inverts a reference grid voltage through the main breaker QF, and inverts a voltage with the same frequency and phase as the reference grid voltage at the stator side of the wind driven generator 20 through the machine-side converter 102, so that the wind driven generator 20 operates in a normal grid-connected mode.
Example two
The present embodiment is based on the first embodiment, and in the present embodiment,
the network side converter 101 includes a network side filter inductor and a network side filter capacitor, and the machine side converter 102 includes a machine side filter inductor and a machine side RC filter component.
The PCS component unit 41 includes a DC-DC power converter 411, a DC filter inductor L1, a filter capacitor C1, a second DC contactor K4, a second soft start contactor K5, a second soft start capacitor R2, and an isolating switch QS; the energy storage unit 42 is connected with the DC-DC power converter 411 through an isolating switch QS, a second fuse FU2, a third fuse FU3, a direct current contactor K4, a direct current filter inductor and a filter capacitor C1 which are connected in series, one end of a direct current filter inductor L1 is connected with the filter capacitor C1, the other end of the filter capacitor C1 is connected with one input end of the DC-DC power converter, the second direct current contactor K4 is connected with a second soft start loop in parallel, and the second soft start loop comprises a second soft start contactor K5 and a second soft start capacitor R2 which are connected in series; the output end of the DC-DC power converter 411 is connected to the bus capacitor C2 through the first black start loop.
EXAMPLE III
The present embodiment is based on the first embodiment, in which,
the PCS module unit 41 further includes a second fuse FU2 and a third fuse FU3, wherein positive and negative output terminals of the QS are respectively connected to one end of the second fuse FU2 and one end of the third fuse FU3, the other end of the second fuse FU2 is connected to the second DC contactor K4, and the other end of the third fuse FU3 is connected to an input terminal of the DC-DC power converter 411.
The first soft start circuit further comprises a first fuse FU1, and the first fuse FU1 is connected with the first soft start contactor K2 and the first soft start resistor R1 in series.
Example four
The present embodiment is based on the first embodiment, and in the present embodiment,
in the present embodiment, the energy storage unit 42 is a super capacitor battery or a lithium battery.
EXAMPLE five
The embodiment discloses a wind generating set, and in the embodiment, the wind generating set adopts any one of the first to the sixth wind storage integrated converter with the black start function.
The auxiliary power system unit of the wind-storage integrated converter control system with the black start function obtains power from the energy storage unit, a transformer is not adopted for power obtaining, the power of the auxiliary power system unit is low, and when the grid is normally connected, the auxiliary power system is in a dormant state, so that the cost is saved; a breaker and a grid-connected switch are used between a power grid and a wind driven generator to protect a black start process, an energy storage unit is provided with a PCS auxiliary power supply, when the system is completely out of power, the PCS auxiliary power supply starts a PCS controller, and then a converter controller is started, so that the safety performance is good; when the grid side of the converter is in black start, a fuse is added into a soft start loop, so that the problem caused by over-high charging in black start can be controlled more safely.
It should be understood that the above is only a preferred embodiment of the present invention, and the scope of the present invention is not limited thereto, and all the equivalent structures or equivalent flow changes made by the contents of the specification and the drawings or directly or indirectly applied to other related technical fields are also included in the scope of the present invention.
Claims (7)
1. A wind-storage integrated converter with a black start function is characterized by comprising a grid-side converter, a machine-side converter, a converter controller and a PCS system unit, wherein the grid-side converter is connected with a power grid through a transformer T1 and a main circuit breaker QF, the machine-side converter is connected with a wind driven generator, the grid-side converter and the machine-side converter are connected through a bus capacitor C2, and the power grid is connected with the wind driven generator through the transformer T1, the main circuit breaker QF and a grid-connected contactor K3;
the PCS system unit comprises a PCS component unit, an energy storage unit, a PCS controller, a DC-AC power converter, an auxiliary power system unit and a PCS auxiliary power supply, wherein the PCS component unit is connected with the bus capacitor C2 through a first black start loop, the first black start loop comprises a direct current loop and a first soft start loop which are connected in parallel, the first soft start loop comprises a first soft start resistor R1 and a first soft start contactor K2 which are connected in series, and the direct current loop comprises a first direct current contactor K1;
the PCS component unit is connected with the energy storage unit, the energy storage unit is connected with the PCS auxiliary power supply, and the PCS auxiliary power supply is connected with the PCS controller;
the energy storage unit is connected with the auxiliary electric system unit through the DC-AC power converter, the auxiliary electric system unit is connected with the converter controller, the converter controller is connected with the main controller, and the DC-AC power converter, the auxiliary electric system unit, the converter controller and the main controller form a second black start loop.
2. The wind-storage integrated converter with the black-start function according to claim 1, wherein the grid-side converter comprises a grid-side filter inductor and a grid-side filter capacitor, and the machine-side converter comprises a machine-side filter inductor and a machine-side RC filter component.
3. The wind-storage integrated converter with the black-start function according to claim 1, wherein the PCS component unit comprises a DC-DC power converter, a DC filter inductor L1, a filter capacitor C1, a second DC contactor K4, a second soft start contactor K5, a second soft start capacitor R2 and a disconnecting switch QS; the energy storage unit is connected with the DC-DC power converter through the isolating switch QS, the second fuse FU2, the third fuse FU3, the direct current contactor K4, the direct current filter inductor and the filter capacitor C1 which are connected in series, one end of the direct current filter inductor L1 is connected with the filter capacitor C1, the other end of the filter capacitor C1 is connected with one input end of the DC-DC power converter, the second direct current contactor K4 is connected with a second soft start loop in parallel, and the second soft start loop comprises a second soft start contactor K5 and a second soft start capacitor R2 which are connected in series; and the output end of the DC-DC power supply converter is connected with the bus capacitor C2 through the first black start loop.
4. The wind-storage integrated converter with black start function according to claim 3, wherein said PCS module unit further comprises a second fuse FU2 and a third fuse FU3, said QS output positive and negative terminals are respectively connected to one end of said second fuse FU2 and one end of said third fuse FU3, said second fuse FU2 is connected to said second DC contactor K4 at another end, and said third fuse FU3 is connected to an input terminal of said DC-DC power converter at another end.
5. The wind-storage integrated converter with the black-start function according to claim 1, wherein the energy storage unit is a super capacitor battery or a lithium battery.
6. The wind-storage integrated converter with the black-start function according to claim 1, wherein the first soft-start circuit further comprises a first fuse FU1, and the first fuse FU1 is connected in series with the first soft-start contactor K2 and a first soft-start resistor R1.
7. A wind generating set is characterized in that the wind storage integrated converter with the black start function of any one of claims 1 to 6 is adopted.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221681860.2U CN217904033U (en) | 2022-06-30 | 2022-06-30 | Wind-storage integrated converter with black start function and wind generating set |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221681860.2U CN217904033U (en) | 2022-06-30 | 2022-06-30 | Wind-storage integrated converter with black start function and wind generating set |
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| CN217904033U true CN217904033U (en) | 2022-11-25 |
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| CN202221681860.2U Active CN217904033U (en) | 2022-06-30 | 2022-06-30 | Wind-storage integrated converter with black start function and wind generating set |
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| Country | Link |
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| CN (1) | CN217904033U (en) |
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2022
- 2022-06-30 CN CN202221681860.2U patent/CN217904033U/en active Active
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