CN111416380A - Power supply control circuit of wind power double-fed converter in grid connection - Google Patents
Power supply control circuit of wind power double-fed converter in grid connection Download PDFInfo
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- CN111416380A CN111416380A CN201911383028.7A CN201911383028A CN111416380A CN 111416380 A CN111416380 A CN 111416380A CN 201911383028 A CN201911383028 A CN 201911383028A CN 111416380 A CN111416380 A CN 111416380A
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- power supply
- relay
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- 238000012544 monitoring process Methods 0.000 claims description 20
- 238000000034 method Methods 0.000 description 8
- 230000008569 process Effects 0.000 description 5
- 230000003068 static effect Effects 0.000 description 5
- 230000007547 defect Effects 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000007774 longterm Effects 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000010248 power generation Methods 0.000 description 1
- 230000004044 response Effects 0.000 description 1
- 239000004065 semiconductor Substances 0.000 description 1
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Classifications
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H47/00—Circuit arrangements not adapted to a particular application of the relay and designed to obtain desired operating characteristics or to provide energising current
- H01H47/002—Monitoring or fail-safe circuits
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H47/00—Circuit arrangements not adapted to a particular application of the relay and designed to obtain desired operating characteristics or to provide energising current
- H01H47/22—Circuit arrangements not adapted to a particular application of the relay and designed to obtain desired operating characteristics or to provide energising current for supplying energising current for relay coil
- H01H47/223—Circuit arrangements not adapted to a particular application of the relay and designed to obtain desired operating characteristics or to provide energising current for supplying energising current for relay coil adapted to be supplied by AC
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J9/00—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting
- H02J9/04—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source
- H02J9/06—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source with automatic change-over, e.g. UPS systems
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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
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B10/00—Integration of renewable energy sources in buildings
- Y02B10/70—Hybrid systems, e.g. uninterruptible or back-up power supplies integrating renewable energies
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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 invention provides a power supply control loop of a wind power double-fed converter in grid connection, which comprises an alternating current power supply, a direct current power supply, a UPS, a grid-connected contactor KM1, a large-capacity relay K1, a contactor pull-in control relay K3, a contactor breaking control relay K4 and a P L C controller, wherein a coil power supply end of the grid-connected contactor KM1 is connected with a large-capacity relay K1, the large-capacity relay K1 is connected with an UPS output end through a normally closed contact, the large-capacity relay K1 is connected with an alternating current power supply output end through a normally open contact, the contactor pull-in control relay K3 is connected with the UPS direct current power supply output end and a pull-in signal end of the grid-connected contactor KM1, and the breaking control relay K4 is connected with a circuit between the UPS direct current power supply output end and the breaking signal end of the grid-connected contactor KM 1.
Description
Technical Field
The invention belongs to the technical field of wind power generation, and particularly relates to a power supply control loop of a wind power double-fed converter in grid connection.
Background
Wind energy has become the most mature renewable clean energy source with the best scale development condition in the current technology. The wind generating set is a set of automatic adjustment unattended full-automatic equipment, and in the operation process, the requirement of low voltage ride through in national standards needs to be met, and the voltage cannot be disconnected within a certain time at 20 percent of rated voltage, so that power supplies of parts such as a controller, a main loop switch and the like need to be provided by an online UPS (uninterrupted power supply) in a converter power distribution link. However, with the development of the wind power field, the capacity of the wind generating set is continuously increased, the capacity of a grid-connected contactor KM1 applied to the stator side of a double-fed converter and connected with a power grid is increased, and the current of a closing coil of the contactor is increased, so that the requirement is provided for an online UPS supplying power to the wind generating set, if the capacity of an internal inversion module of the UPS is not enough to support the instantaneous current of the closing coil of the contactor, the voltage of the AC UPS is reduced at the closing moment of the grid-connected contactor KM1, the control of the power supply voltage of a rear-end core controller and other main loop devices is influenced
The UPS capacity is mainly selected in two modes, the first mode is that the UPS capacity is increased according to the instant instantaneous current capacity of a closing coil of a contactor, the method has the defect that the capacity of the contactor is increased later, the UPS capacity is increased in a mode of a main loop capacity proportion or even a larger proportion, in the long-term operation process, the capacity of other control loops is not increased, only 30-10% or even lower of the UPS capacity is used, the mode is poor in economy, and the larger converter structural design space is occupied.
The second method is that a UPS is selected according to the long-term use capacity of a control loop at the rear end of the UPS, the instantaneous current process of a closing coil is ignored, a direct-current UPS of a controller is added, the influence of current on 24VDC voltage of the controller is avoided, the influence on other devices is reduced, and the defects that a direct-current UPS and a corresponding battery are required to be added, the cost and fault points are increased, and the structural space is occupied are overcome; in addition, the unmatched capacity can cause damage to semiconductor devices of the internal inversion modules of the UPS, the failure rate is increased, and the service life of the AC UPS is shortened.
Disclosure of Invention
In view of the above, the invention aims to provide a power supply control loop of a wind power double-fed converter in grid connection, so as to solve the problem of wind power double-fed parallel flow under the condition of meeting the requirements of economy and saving space structure.
In order to achieve the purpose, the technical scheme of the invention is realized as follows:
a power supply control loop of a wind power double-fed converter in grid connection comprises an alternating current power supply, a direct current power supply, a UPS, a grid-connected contactor KM1, a high-capacity relay K1, a contactor pull-in control relay K3 and a contactor breaking control relay K4 and a P L C controller, wherein a coil power supply end of the grid-connected contactor KM1 is connected with a high-capacity relay K1, a high-capacity relay K1 is connected with an output end of the UPS through a normally closed contact, a high-capacity relay K1 is connected with an output end of the alternating current power supply through a normally open contact, a contactor pull-in control relay K3 is connected to a circuit between the output end of the UPS and a pull-in signal end of a grid-connected contactor KM1, and a contactor control relay K4 is connected;
the signal ends of the high-capacity relay K1, the contactor pull-in control relay K3 and the contactor break-off control relay K4 are connected with a P L C controller;
the grid-connected contactor KM1 is arranged on the stator side of the doubly-fed converter and is connected with a power grid.
Further, the method also comprises the following steps: the 24V power supply monitoring relay K2 is connected between a direct current power supply and a grid-connected contactor KM1 disconnection signal end, and the 24V power supply monitoring relay K2 is used for monitoring the voltage of a UPS direct current power supply and controlling the connection and disconnection of a circuit of the UPS direct current power supply and the grid-connected contactor disconnection signal end.
Furthermore, the high-capacity relay K1 has two sets of contacts, the first common moving contact and the second common moving contact of the high-capacity relay K1 are respectively connected with the first coil power supply end and the second coil power supply end of the grid-connected contactor KM1, and the first normally closed stationary contact and the second normally closed stationary contact of the high-capacity relay K1 are respectively connected with the output end L end and the output end N end of the UPS and are connected with the end L end and the end N end of the ac power supply.
Furthermore, one end of a normally open switch of the high-capacity relay K1 is connected with a first normally open fixed contact of the high-capacity relay K1, and the other end of the normally open switch is connected with a first common movable contact of the high-capacity relay K1; one end of the normally closed switch of the large-capacity relay K1 and one end of the normally closed switch of the 24V power supply monitoring relay K2 are both connected with a first normally closed stationary contact of the large-capacity relay K1, and the other end of the normally closed switch of the large-capacity relay K1 and the other end of the normally closed switch of the 24V power supply monitoring relay K2 are both connected with a first common movable contact of the large-capacity relay K1.
Compared with the prior art, the invention has the following advantages:
(1) the power supply control loop of the wind power double-fed converter in grid connection utilizes the P L C controller to control the relay, and has the advantages of rapid response and low failure rate.
(2) The power supply control circuit of the wind power double-fed converter in grid connection is controlled by the aid of the high-capacity relay K1, and the high-capacity relay K1 can maintain the state of a main contact after a normally closed switch is switched off.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and, together with the description, serve to explain the invention and not to limit the invention in any way. In the drawings:
fig. 1 is a schematic diagram of a grid-connected contactor coil power supply circuit and a control circuit thereof according to an embodiment of the invention;
fig. 2 is a schematic view of an inner coil of a contactor according to an embodiment of the present invention.
Description of the drawings:
KM 1: grid-connected contactor K1: high-capacity relay K2: 24V power supply monitor relay K3: contactor pull-in control relay K4 contactor breaking control relay 1: attracting signal end 2: and a signal breaking end 3: common contact terminal 11: first common moving contact 12: first normally-closed stationary contact 22: second normally closed stationary contact 14: first normally open stationary contact 22: a second normally closed stationary contact.
Detailed Description
It should be noted that the embodiments and features of the embodiments of the present invention may be combined with each other without conflict.
In the description of the present invention, it is to be understood that the terms "central", "longitudinal", "lateral", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of describing the present invention and simplifying the description, but do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be considered as limiting the present invention. Furthermore, the terms "first," "second," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first," "second," etc. may explicitly or implicitly include one or more of that feature. In the description of the invention, the meaning of "a plurality" is two or more unless otherwise specified.
In the description of the invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted", "connected" and "connected" are to be construed broadly, e.g. as being fixed or detachable or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be connected internally or indirectly. The specific meaning of the above terms in the creation of the present invention can be understood by those of ordinary skill in the art through specific situations.
The invention will be described in detail with reference to the following embodiments with reference to the attached drawings.
As shown in fig. 1 and fig. 2, a power supply control loop of a wind power double-fed converter in grid connection comprises an alternating current power supply, a direct current power supply, a UPS, a grid-connected contactor KM1, a large-capacity relay K1, a contactor pull-in control relay K3, a contactor cut-off control relay K4 and a P L C controller, wherein a power supply end of a coil of the grid-connected contactor KM1 is connected with a large-capacity relay K1, a large-capacity relay K1 is connected with an output end of the UPS through a normally closed contact, a large-capacity relay K1 is connected with an output end of the alternating current power supply through a normally open contact, a contactor pull-in control relay K3 is connected to a circuit between the output end of the UPS direct current power supply and a pull-in signal end of the grid-connected contactor KM1, and a contactor;
the signal ends of the high-capacity relay K1, the contactor pull-in control relay K3 and the contactor break-off control relay K4 are connected with a P L C controller;
the P L C controls a capacity relay, a contactor pull-in control relay K3 and a contactor break-off control relay K4 through commands.
The grid-connected contactor KM1 is arranged on the stator side of the doubly-fed converter and is connected with a power grid.
The power supply control circuit of the wind power double-fed converter in grid connection further comprises a 24V power supply monitoring relay K2, the 24V power supply monitoring relay K2 is connected between a direct-current power supply and a grid-connected contactor KM1 breaking signal end, and the 24V power supply monitoring relay K2 signal end is used for monitoring the voltage of a UPS direct-current power supply and controlling the on-off of a circuit of the UPS direct-current power supply and the grid-connected contactor breaking signal end.
When the direct-current power supply changes, the 24V power supply monitoring relay K2 acts, one contact group 11 and one contact group 12 are disconnected, the grid-connected contactor KM1 is disconnected, the other contact group is connected to a digital value input point of the controller, and the controller is informed that the 24V power supply voltage has problems.
The high-capacity relay K1 is provided with two groups of contacts, a first common moving contact and a second common moving contact of the high-capacity relay K1 are respectively connected with a first coil power supply end and a second coil power supply end of the grid-connected contactor KM1, and a first normally-closed static contact and a second normally-closed static contact of the high-capacity relay K1 are respectively connected to an output end L end and an output end N end of the UPS and are connected with a L end and an N end of the alternating-current power supply.
One end of a normally open switch of the high-capacity relay K1 is connected with a first normally open static contact of the high-capacity relay K1, and the other end of the normally open switch is connected with a first common movable contact of the high-capacity relay K1; one end of the large-capacity relay K1 normally closed switch and one end of the 24V power supply monitoring relay K2 normally closed switch are both connected with a first normally closed stationary contact of the large-capacity relay K1, and the other end of the large-capacity relay K1 normally closed switch and the other end of the 24V power supply monitoring relay K2 normally closed switch are both connected with a first common movable contact of the large-capacity relay K1.
The actual large-capacity contactor coil KM1 (shown as an AF2050 contactor manufactured by ABB) basically has the principle as shown in fig. 2, a1 and a2 are coil power supplies, a normally closed switch and a main contact operate simultaneously, the normally closed switch is closed when the main contact is opened, a closing coil is turned on at the moment when the contactor coil is turned on, the current value is large, but after the main contact is closed, the normally closed switch is opened, the closing coil is connected to a holding coil, the current is reduced and maintained, but the main contact state is sufficiently maintained.
As shown in a schematic diagram of a grid-connected contactor KM1 coil power supply circuit and a control circuit thereof shown in fig. 1, a point 2 of KM1 is a P L C control breaking signal, the contactor can be broken without 24V, a point 1 is a P L C control attracting signal, 24V is input to the point 1 and the point 2 simultaneously, the contactor can be attracted, a point 3 is a common point and is connected with 0V, a P L C control holder is also provided with two groups of contact large-capacity direct current coil intermediate relays K1, common movable contacts 11 and 21 of the two groups of contacts are connected to coil power supply ends A1 and A2 of a grid-connected contactor KM1, normally closed stationary contacts 12 and 22 are connected to output ends L and N2 of a UPS, normally open stationary contacts 14 and 24 are connected to input ends of the UPS (namely L and N1 of a single-phase 230V commercial power, 24VDC coils are controlled by P L C, and the on-off control of a main contact of a grid-connected contactor KM1 is implemented by a current transformer controller controlling.
Under a normal state, alternating current 230V mains supply is connected, the input end of a UPS generates voltage, a P L C controls common contacts 11 and 21 of a large-capacity relay K1 to be in contact with normally-open static contacts 14 and 24, at the moment, a grid-connected contactor KM1 controlled by the P L C does not obtain a pull-in command, a coil of the grid-connected contactor KM1 is not connected, when a wind generating set runs to a grid-connected stage, the controller sends out a contactor pull-in command, the contactor P L C controls the coil to be connected, at the moment, the instant current of a closing coil is provided by mains supply and does not use a UPS power supply, the delay time is 1s after the grid-connected contactor KM1 finishes acting, the P L C controls the relay K1 to be in a switching state, the common contacts 11 and 21 are in contact with normally-closed static contacts 12 and 22, the acting time Toff is less than 3ms, the pull-in and the grid-connected contactor KM1 has clear switching characteristics of pull-in a holding state, and the coil current of the KM1 coil is still maintained as a maintaining current during the period of the action of the.
In addition, because the controller can still operate in the voltage drop process, and the control breaking of the contactor is sent by the controller, a 24V power supply monitoring relay K2 is added to a breaking command controlled by the contactor P L C, if the contacts of the relay are adhered or fail, the contactor is powered by the UPS in the closing process, the output voltage of the UPS is reduced, the voltage of a 24V switching power supply powered by the UPS is reduced, the 24V power supply monitoring relay K2 acts, one contact group 11 and 12 is broken, the grid-connected contactor KM1 is broken, the other contact group is connected to a digital value input point of the controller, the controller is informed that the 24V power supply voltage has a problem, and the controller waits for maintenance after alarming.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements, etc. made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (4)
1. A power supply control loop of a wind power double-fed converter in grid connection is characterized by comprising an alternating current power supply, a direct current power supply, a UPS, a grid-connected contactor KM1, a large-capacity relay K1, a contactor pull-in control relay K3 and a contactor breaking control relay K4 and a P L C controller, wherein a power supply end of a coil of the grid-connected contactor KM1 is connected with a large-capacity relay K1, a large-capacity relay K1 is connected with an output end of the UPS through a normally closed contact, a large-capacity relay K1 is connected with an output end of the alternating current power supply through a normally open contact, a contactor pull-in control relay K3 is connected to a circuit between the output end of the UPS and a pull-in signal end of the grid-connected contactor KM1, and a contactor control relay;
the signal ends of the high-capacity relay K1, the contactor pull-in control relay K3 and the contactor break-off control relay K4 are connected with a P L C controller;
the grid-connected contactor KM1 is arranged on the stator side of the doubly-fed converter and is connected with a power grid.
2. The power supply control loop of the wind power double-fed converter in grid connection according to claim 1 is characterized in that: further comprising: the 24V power supply monitoring relay K2, the 24V power supply monitoring relay K2 is connected between a direct current power supply and a disconnection signal end of the grid-connected contactor KM1, and the 24V power supply monitoring relay K2 is used for monitoring the voltage of the UPS direct current power supply and controlling the on-off of a circuit of the disconnection signal end of the UPS direct current power supply and the grid-connected contactor.
3. The power supply control circuit of a wind power double-fed converter in grid connection of claim 1 is characterized in that the high-capacity relay K1 has two groups of contacts, a first common moving contact and a second common moving contact of the high-capacity relay K1 are respectively connected with a first coil power supply end and a second coil power supply end of a grid connection contactor KM1, and a first normally-closed fixed contact and a second normally-closed fixed contact of the high-capacity relay K1 are respectively connected with an output end L end and an output end N end of a UPS and are connected with a L end and an N end of an alternating current power supply.
4. The power supply control loop of the wind power double-fed converter in grid connection according to claim 1 is characterized in that: one end of a normally open switch of the high-capacity relay K1 is connected with a first normally open fixed contact of the high-capacity relay K1, and the other end of the normally open switch is connected with a first common movable contact of the high-capacity relay K1; one end of the large-capacity relay K1 normally closed switch and one end of the 24V power supply monitoring relay K2 normally closed switch are both connected with a first normally closed stationary contact of the large-capacity relay K1, and the other end of the large-capacity relay K1 normally closed switch and the other end of the 24V power supply monitoring relay K2 normally closed switch are both connected with a first common movable contact of the large-capacity relay K1.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911383028.7A CN111416380A (en) | 2019-12-27 | 2019-12-27 | Power supply control circuit of wind power double-fed converter in grid connection |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911383028.7A CN111416380A (en) | 2019-12-27 | 2019-12-27 | Power supply control circuit of wind power double-fed converter in grid connection |
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| Publication Number | Publication Date |
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| CN111416380A true CN111416380A (en) | 2020-07-14 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201911383028.7A Pending CN111416380A (en) | 2019-12-27 | 2019-12-27 | Power supply control circuit of wind power double-fed converter in grid connection |
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| CN (1) | CN111416380A (en) |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106505728A (en) * | 2016-12-26 | 2017-03-15 | 天津瑞能电气有限公司 | Power supply control loop of the wind-powered electricity generation double-feed current transformer in grid-connected |
| CN213817252U (en) * | 2019-12-27 | 2021-07-27 | 天津瑞能电气有限公司 | Power supply control circuit of wind power double-fed converter in grid connection |
-
2019
- 2019-12-27 CN CN201911383028.7A patent/CN111416380A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106505728A (en) * | 2016-12-26 | 2017-03-15 | 天津瑞能电气有限公司 | Power supply control loop of the wind-powered electricity generation double-feed current transformer in grid-connected |
| CN213817252U (en) * | 2019-12-27 | 2021-07-27 | 天津瑞能电气有限公司 | Power supply control circuit of wind power double-fed converter in grid connection |
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