CN219717890U - Driver with high voltage ride through function - Google Patents
Driver with high voltage ride through function Download PDFInfo
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- CN219717890U CN219717890U CN202320962478.7U CN202320962478U CN219717890U CN 219717890 U CN219717890 U CN 219717890U CN 202320962478 U CN202320962478 U CN 202320962478U CN 219717890 U CN219717890 U CN 219717890U
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- 238000012544 monitoring process Methods 0.000 claims abstract description 10
- 239000003990 capacitor Substances 0.000 claims description 20
- 238000004891 communication Methods 0.000 claims description 12
- 230000001052 transient effect Effects 0.000 abstract description 10
- 238000010586 diagram Methods 0.000 description 8
- 238000007599 discharging Methods 0.000 description 5
- 238000000034 method Methods 0.000 description 4
- 238000005457 optimization Methods 0.000 description 4
- 238000010248 power generation Methods 0.000 description 4
- 230000008569 process Effects 0.000 description 4
- 238000012986 modification Methods 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 230000009467 reduction Effects 0.000 description 3
- 238000013461 design Methods 0.000 description 2
- 238000004146 energy storage Methods 0.000 description 2
- 230000000630 rising effect Effects 0.000 description 2
- 230000008859 change Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000008092 positive effect Effects 0.000 description 1
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Abstract
The utility model relates to the technical field of variable-pitch drives, in particular to a drive with a high-voltage ride-through function, which comprises a rectifying unit, a BUCK voltage reducing loop, a direct current bus, a backup power supply unit and a servo control unit, wherein the rectifying unit converts alternating current into direct current and outputs the direct current to the direct current bus, the direct current bus provides working voltage for the servo control unit, when the rectifying unit inputs alternating current mains supply, the direct current bus charges the backup power supply unit, when the alternating current mains supply is disconnected, the backup power supply unit provides working voltage for the servo control unit, when a voltage monitoring module of a variable-pitch system detects that the alternating current mains supply exceeds a normal value, the BUCK voltage reducing loop is cut into between the rectifying unit and the direct current bus, and the BUCK voltage reducing loop is used for reducing the direct current voltage. The utility model can protect the internal components of the variable pitch drive when the variable pitch drive faces higher power frequency transient overvoltage, so that the variable pitch drive is not damaged by high mains voltage.
Description
Technical Field
The utility model relates to the technical field of variable pitch drives, in particular to a drive with a high-voltage ride through function.
Background
For a wind power generation field, due to instability of wind power, a wind turbine generator is often subjected to voltage abrupt change, so that a wind power field fan is wholly separated, the voltage of a power grid fluctuates, the stable operation of the power grid is affected, and even the wind turbine generator stops operating when serious. Therefore, when the power grid fails or the voltage rises due to disturbance, whether the wind farm can ensure that the fan continuously runs without off-grid is related to safe and stable running of the whole power grid. According to the actual running condition of the wind power plant, detailed requirements are made on the high voltage ride through capability of the wind turbine generator, and the wind turbine generator requiring grid-connected power generation must have the high voltage ride through capability.
As shown in fig. 7, a schematic diagram of a typical pitch drive is shown, in which an ac mains supply (typically 400V) is input from a power grid to a rectifying unit in the drive, the rectifying unit converts ac power into dc power (typically 550V-570V) and outputs the dc power to a dc bus, the dc bus provides working voltages for servo control units in the drive, and the servo control units further control the pitch composition structure of a servo motor unit, a sensor unit, and the like connected to the drive.
As one of the cores of the unit, the pitch system is also required to have a high-voltage ride through function; at the heart of the pitch system is the drive. When the power grid fails or the voltage rises due to disturbance, the traditional variable pitch driver usually depends on the performance of components of the variable pitch driver to bridge the power frequency transient overvoltage; when the power frequency transient overvoltage is too high, components and parts in the driver can be damaged, so that functions of a variable pitch system are damaged, a unit cannot operate, and the power generation efficiency of a wind power plant is affected. The high voltage ride through capability of the pitch system is shown in fig. 8, namely, the pitch system can ensure continuous operation without off-grid for 0.5s when the rated voltage is 1.3 times; the continuous operation without off-grid for 1s can be ensured when the rated voltage is 1.25 times; the continuous operation without off-grid for 10s can be ensured when the rated voltage is 1.2 times; the continuous operation without off-grid for a long time can be ensured when the rated voltage is 1.15 times.
Disclosure of Invention
The utility model provides a driver with a high voltage ride through function, which can protect internal components of the driver when a variable pitch driver faces higher power frequency transient overvoltage, so that the driver is not damaged by high mains voltage.
In order to achieve the purpose of the utility model, the technical scheme is that the driver with the high-voltage ride-through function comprises a rectifying unit, a BUCK voltage reducing circuit, a direct current bus, a backup power supply unit and a servo control unit, wherein the rectifying unit converts alternating current into direct current and outputs the direct current to the direct current bus, the direct current bus provides working voltage for the servo control unit, when the rectifying unit inputs alternating current mains supply, the direct current bus charges the backup power supply unit to disconnect the alternating current mains supply, the backup power supply unit provides working voltage for the servo control unit, and when a voltage monitoring module of a pitch system detects that the alternating current mains supply exceeds a normal value, the BUCK voltage reducing circuit is cut into between the rectifying unit and the direct current bus, and the BUCK voltage reducing circuit is used for reducing the direct current voltage.
As an optimization scheme of the utility model, the BUCK step-down loop comprises a relay KA1, an inductor L1, a capacitor C1, a resistor R1 and a diode D1, wherein the relay KA1 comprises a normally open contact and a normally closed contact, one end of the normally closed contact is connected with the positive electrode of the rectifying unit, and the other end of the normally closed contact is connected with the positive electrode of the direct current bus; the positive pole of rectifying element is connected to normally open contact one end, and the diode D1 and inductance L1 are connected respectively to the normally open contact other end, and normally, rectifying element passes through relay KA1 normally closed contact and directly is connected with the direct current busbar, and during high-voltage crossing, relay KA1 work, normally open contact actuation, normally closed contact disconnection, rectifying element pass through normally open contact and connect BUCK step-down return circuit earlier and then be connected with the direct current busbar, inductance L1 connects between diode D1's negative pole and direct current busbar's positive pole, resistance R1 and electric capacity C1 parallel connection are between the positive and negative pole of direct current busbar.
As an optimization scheme of the utility model, the backup power supply unit is a super capacitor.
As an optimization scheme of the utility model, the rectification unit is a three-phase bridge rectification circuit, the three-phase bridge rectification circuit comprises a thyristor V1, a thyristor V2, a thyristor V3, a thyristor V4, a thyristor V5 and a thyristor V6, the thyristor V1, the thyristor V3 and the thyristor V5 form a common cathode group, the thyristor V2, the thyristor V4 and the thyristor V6 form a common anode group, and the thyristor V1 and the thyristor V4 are connected with U LN1 Phase, thyristor V3 and thyristor V6 are connected with U LN2 Phase, transistor V5 and thyristor V2 are connected to U LN3 And (3) phase (C). The rectifying unit converts the input alternating current into direct current U o Output of
As an optimization scheme of the utility model, the servo control unit comprises an inverter, a 24V power supply module, an encoder and brake module, a logic control I/O module and a communication module, wherein the inverter is used for converting direct current of a direct current bus into alternating current to supply power to a servo motor, and the 24V power supply module is used for converting direct current into 24V direct current to supply power to the encoder and brake module, the logic control I/O module and the communication module.
The utility model has the positive effects that: 1) Compared with the traditional driver, the size, the mounting mode and the interface of the driver are completely consistent, and when the traditional driver is replaced in the pitch system, other designs are not required to be changed, so that the driver has stronger compatibility;
2) The utility model has better high-voltage ride through capability, can be more suitable for the complexity of a wind power plant power grid, has stronger self-protection capability against power frequency transient overvoltage, can reduce the damage rate of a driver, reduces the replacement of the driver caused by the burning of components in the driver, further saves the cost, reduces the occurrence of faults, improves the power generation efficiency of the wind power plant, and improves the wind power plant income.
Drawings
The utility model will be described in further detail with reference to the drawings and the detailed description.
FIG. 1 is a schematic circuit diagram of the present utility model;
FIG. 2 is a schematic circuit diagram of a BUCK BUCK circuit;
FIG. 3 is an equivalent circuit diagram of a BUCK BUCK circuit without cut-in;
FIG. 4 is an equivalent circuit diagram of a BUCK loop cut-in;
FIG. 5 is a schematic circuit diagram of a rectifying unit;
FIG. 6 is a functional block diagram of a servo control unit;
FIG. 7 is a schematic diagram of a typical pitch drive;
FIG. 8 is a graph of the high voltage ride through capability that the pitch system should possess;
wherein: 1. the device comprises a rectifying unit, a BUCK circuit, a direct current bus, a backup power unit, a servo control unit, an inverter, a 52 and 24V power module, an encoder and brake module, a logic control I/O module, a communication module and a communication module, wherein the rectifying unit, the BUCK circuit, the direct current bus, the backup power unit, the servo control unit, the inverter, the 52 and 24V power module, the encoder and brake module, the logic control I/O module and the communication module are respectively arranged in sequence, and the communication module is arranged in sequence.
Detailed Description
As shown in fig. 1, the utility model discloses a driver with a high voltage ride through function, which comprises a rectifying unit 1, a BUCK circuit 2, a direct current bus 3, a backup power supply unit 4 and a servo control unit 5, wherein the rectifying unit 1 converts alternating current into direct current and outputs the direct current to the direct current bus 3, the direct current bus 3 provides working voltage for the servo control unit 5, when the rectifying unit 1 inputs alternating current mains supply, the direct current bus 3 charges the backup power supply unit 4 and cuts off the alternating current mains supply, the backup power supply unit 4 provides working voltage for the servo control unit 5, when a voltage monitoring module of a pitch system detects that the alternating current mains supply exceeds a normal value (400V), the BUCK circuit 2 cuts in between the rectifying unit 1 and the direct current bus 3, and the BUCK circuit 2 is used for reducing the direct current voltage.
When the voltage monitoring module of the pitch system detects that the commercial power is normal, the BUCK step-down loop does not cut into the space between the rectifying unit and the direct current bus, and at the moment, the driver of the utility model has the same working mode as a common driver, the rectifying unit 1 is directly connected with the direct current bus 3, and the output voltage of the rectifying unit of the driver is equal to the voltage of the direct current bus;
when a voltage monitoring module of the pitch system detects that the commercial power is higher, a BUCK voltage reduction loop 2 is cut into a position between a rectifying unit 1 and a direct current bus 3, at the moment, the higher alternating current commercial power is input into a driver rectifying unit and is converted into the higher direct current through the rectifying unit to be input into the BUCK voltage reduction loop 2, the BUCK voltage reduction loop 2 reduces the higher direct current and then inputs the higher direct current into the direct current bus 3, and the direct current bus 3 provides normal working voltage for a servo control unit 5 to protect components in the servo control unit connected to the direct current bus;
when the voltage monitoring module of the pitch system detects that the commercial power is too high, the voltage monitoring module directly disconnects the pitch from the commercial power and supplies power to the backup power unit.
Therefore, when the voltage is increased due to power grid faults or disturbance, the driver disclosed by the utility model cannot damage internal components by power frequency transient overvoltage. The voltage monitoring module of the pitch system can be realized by adding a voltage detection circuit on the pitch system.
As shown in fig. 2, the BUCK circuit 2 comprises a relay KA1, an inductor L1, a capacitor C1, a resistor R1 and a diode D1, wherein the relay KA1 comprises a normally open contact and a normally closed contact, one end of the normally closed contact is connected with the positive electrode of the rectifying unit 1, and the other end of the normally closed contact is connected with the positive electrode of the direct current bus 3; one end of the normally open contact is connected with the positive electrode of the rectifying unit 1, the other end of the normally open contact is respectively connected with the diode D1 and the inductor L1, the inductor L1 is connected between the negative electrode of the diode D1 and the positive electrode of the direct current bus 3, and the resistor R1 and the capacitor C1 are connected in parallel between the positive electrode and the negative electrode of the direct current bus 3. In a normal state, the rectifying unit is directly connected with the direct current bus 3 through a normally closed contact of the relay KA1, the normally open contact is attracted when the relay KA1 works during high voltage crossing, the normally closed contact is disconnected, and the rectifying unit 1 is firstly connected with the BUCK step-down loop 2 through the normally open contact and then connected with the direct current bus 3.
As shown in fig. 5, the rectifying unit 1 is a three-phase bridge rectifying circuit, which includes a thyristor V1, a thyristor V2, a thyristor V3, a thyristor V4, a thyristor V5, and a thyristor V6, wherein the thyristor V1, the thyristor V3, and the thyristor V5 form a common cathode group, and the thyristor V2, the thyristor V4, and the thyristor V6 groupForming a common anode group, and connecting the thyristors V1 and V4 with U LN1 Phase, thyristor V3 and thyristor V6 are connected with U LN2 Phase, transistor V5 and thyristor V2 are connected to U LN3 And (3) phase (C). The rectifying unit 1 converts an input alternating current into a direct current U o And outputting. U (U) LN1 Phase, U LN2 Phase and U LN3 The phase is three-phase mains supply input by the power grid.
As shown in fig. 6, the servo control unit 5 includes an inverter 51, a 24V power module 52, an encoder and brake module 53, a logic control I/O module 54, and a communication module 55, wherein the inverter 51 is used for converting direct current of the direct current bus 3 into alternating current to supply power to the servo motor, and the 24V power module 52 is used for converting direct current into 24V direct current to supply power to the encoder and brake module 53, the logic control I/O module 54, and the communication module 55. Wherein the encoder and brake module 53 is used for controlling the rotation and position of the motor; the logic control I/O module 54 is configured to confirm and control information such as a motor position, a shaft cabinet temperature, and a capacitor voltage; the communication module 55 is used for providing communication for the shaft cabinet, the shaft cabinet and the main control. The servo motor belongs to the servo motor unit. The servo control unit 5 may be implemented using existing modules, and the present design does not involve modifications to the servo control unit 5.
When the commercial power is less than or equal to 1.15Un (rated voltage), components in the driver can be designed to normally operate for a long time by means of the materials and the performances of the components. At this time, the selection relay KA1 is kept in the original state, the equivalent circuit is shown in fig. 3, the direct current bus is directly connected with the rectifying unit, the voltage of the capacitor C1 is equal to the output voltage of the rectifying unit, the charged charge is equal to the discharged charge, and R1 represents the resistance of the circuit.
When the fluctuation of the commercial power exceeds 1.2Un due to the power grid, a voltage monitoring module on the pitch system detects a signal of high commercial power, a BUCK step-down loop is cut into the space between the rectifying unit and the direct current bus, and an equivalent circuit is shown in fig. 4.
At this time, after the higher commercial power is converted into higher direct current through the rectifying unit, the relay KA1 controls the switching-in BUCK voltage-reducing loop, the current of the energy storage inductor L1 is increased to start energy storage, the rising speed of the current is slowed down by the generated induced electric potential, the inductance current is linearly increased, meanwhile, the voltage of the capacitor C1 is smaller than the output voltage of the rectifying unit at this time, the capacitor C1 starts to charge, when the charging charge of the capacitor C1 is higher than the discharging charge, the capacitor voltage is increased, the charging charge is reduced and the discharging charge is increased in the following period, so that the rising speed of the capacitor voltage is slowed down, and the process continues until the charging and discharging balance is reached, and the voltage is kept unchanged.
When the mains supply of the power frequency transient overvoltage vanishing power grid is recovered to be normal, the relay KA1 controls to cut out a BUCK loop, at the moment, the induced electromotive force of the inductor L1 slows down the falling speed of current, the energy stored by the inductor L1 is gradually discharged and consumed through a freewheeling diode, namely a diode D1, the inductance current is linearly reduced, at the moment, the voltage of the capacitor C1 is larger than the output voltage of a rectifying unit at the moment, the capacitor C1 starts to discharge, the capacitor charging charge in the following period is increased, the discharging charge is reduced, the falling speed of the capacitor voltage is slowed down, the process continues until the balance of charging and discharging is reached, and the final maintaining voltage is unchanged.
The process is a transient process of voltage adjustment on the capacitor, namely, when the circuit works in a steady state, the circuit is stable and balanced, and the charge and discharge on the capacitor are balanced, so that when the power frequency transient overvoltage occurs, the voltage of the direct current bus cannot rise and fall along with the transient overvoltage, and the driver can obtain better high-voltage ride-through capability.
While the foregoing is directed to embodiments of the present utility model, other and further details of the utility model may be had by the present utility model, it should be understood that the foregoing description is merely illustrative of the present utility model and that no limitations are intended to the scope of the utility model, except insofar as modifications, equivalents, improvements or modifications are within the spirit and principles of the utility model.
Claims (5)
1. A driver with high voltage ride through function, characterized by: the power supply device comprises a rectifying unit (1), a BUCK step-down loop (2), a direct current bus (3), a backup power supply unit (4) and a servo control unit (5), wherein the rectifying unit (1) converts alternating current into direct current and outputs the direct current to the direct current bus (3), the direct current bus (3) provides working voltage for the servo control unit (5), and when the rectifying unit (1) inputs alternating current commercial power, the direct current bus (3) charges the backup power supply unit (4); when the alternating current commercial power is disconnected, the backup power supply unit (4) provides working voltage for the servo control unit (5), and when the voltage monitoring module of the pitch system detects that the alternating current commercial power exceeds a normal value, the BUCK step-down loop (2) is switched in between the rectifying unit (1) and the direct current bus (3), and the BUCK step-down loop (2) is used for step-down of the direct current voltage.
2. A driver with high voltage ride through according to claim 1, wherein: the BUCK step-down loop (2) comprises a relay KA1, an inductor L1, a capacitor C1, a resistor R1 and a diode D1, wherein the relay KA1 comprises a normally open contact and a normally closed contact, one end of the normally closed contact is connected with the positive electrode of the rectifying unit (1), and the other end of the normally closed contact is connected with the positive electrode of the direct current bus (3); one end of the normally open contact is connected with the positive electrode of the rectifying unit (1), the other end of the normally open contact is respectively connected with the diode D1 and the inductor L1, the inductor L1 is connected between the negative electrode of the diode D1 and the positive electrode of the direct current bus (3), and the resistor R1 and the capacitor C1 are connected in parallel between the positive electrode and the negative electrode of the direct current bus (3).
3. A driver with high voltage ride through according to claim 1, wherein: the backup power supply unit (4) is a super capacitor.
4. A driver with high voltage ride through according to claim 1, wherein: the rectifying unit (1) is a three-phase bridge rectifying circuit, the three-phase bridge rectifying circuit comprises a thyristor V1, a thyristor V2, a thyristor V3, a thyristor V4, a thyristor V5 and a thyristor V6, the thyristor V1, the thyristor V3 and the thyristor V5 form a common cathode group, the thyristor V2, the thyristor V4 and the thyristor V6 form a common anode group, and the thyristor V1 and the thyristor V4 are connected with U LN1 Phase, thyristor V3 and thyristor V6 are connected with U LN2 Phase, transistor V5 and thyristor V2 are connected to U LN3 And (3) phase (C).
5. A driver with high voltage ride through according to claim 1, wherein: the servo control unit (5) comprises an inverter (51), a 24V power supply module (52), an encoder and brake module (53), a logic control I/O module (54) and a communication module (55), wherein the inverter (51) is used for converting direct current of a direct current bus (3) into alternating current to supply power for a servo motor, and the 24V power supply module (52) is used for converting direct current into 24V direct current to supply power for the encoder and brake module (53), the logic control I/O module (54) and the communication module (55).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320962478.7U CN219717890U (en) | 2023-04-25 | 2023-04-25 | Driver with high voltage ride through function |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320962478.7U CN219717890U (en) | 2023-04-25 | 2023-04-25 | Driver with high voltage ride through function |
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| Publication Number | Publication Date |
|---|---|
| CN219717890U true CN219717890U (en) | 2023-09-19 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202320962478.7U Active CN219717890U (en) | 2023-04-25 | 2023-04-25 | Driver with high voltage ride through function |
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| Country | Link |
|---|---|
| CN (1) | CN219717890U (en) |
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2023
- 2023-04-25 CN CN202320962478.7U patent/CN219717890U/en active Active
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