Controlled circuit of back-up power supply of wind generating set

Abstract

The utility model discloses a controlled circuit of a backup power supply of a wind generating set. The controlled circuit comprises a power grid power supply detection circuit, a flyback power supply single trigger starting circuit, a high-voltage flyback switching power supply circuit, a BOOST circuit, an LLC power supply circuit and a constant current charging power supply circuit. According to the utility model, through the connection time sequence among the circuits, the predicted automatic controlled closed-loop operation of the backup power supply of the wind generating set is realized, additional manual operation and maintenance intervention is not needed after the power grid is recovered after power failure, the reliability of the wind generating set is improved, the downtime of the set is reduced, and the operation and maintenance cost of the wind generating set is obviously reduced at the same time.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the field of wind power generation, concretely relates to a controlled circuit of wind turbine set backup power supply. BACKGROUND

[0002] In recent years, with the wide popularization of new energy vehicles, intelligent equipment and the like, the social power consumption is rapidly increasing, the utilization of renewable energy will be dominated by the power industry, and the proportion of non-hydropower renewable energy generation will be doubled. As the most mature renewable energy generation technology other than hydropower generation, wind power generation accounts for a large proportion of the total renewable energy generation installed capacity.

[0003] Further, the wind power generation power supply is composed of a wind turbine set, a tower supporting the wind turbine set, a battery charging controller, an inverter, a load shedding device, a grid-connected controller and a battery pack. The wind turbine set includes a wind wheel and a generator. The wind wheel includes blades, a hub and reinforcing members. The wind wheel rotates to generate electricity under the wind force, and the generator head rotates. With the increasing single-machine power of the wind turbine set, higher requirements are put forward for the safe and reliable operation of the wind turbine set. An important aspect is that the blades of the wind turbine set become longer, and the windward area becomes larger to make full use of wind energy and improve the power generation capacity of the wind turbine set. At the same time, the wind turbine set is subjected to greater stress. When the wind speed is too high or a typhoon occurs, the blades need to be quickly and reliably pitch-controlled to reduce the windward area of the blades and ensure the safety of the wind turbine set under strong wind. Therefore, at any time, the reliable pitch-control function of the wind turbine set is particularly important. Generally, the wind turbine set is provided with a backup power supply (battery or super capacitor) for realizing emergency pitch-control.

[0004] Therefore, the applicant hopes to improve the above technical problems by technical solutions. SUMMARY

[0005] Therefore, the utility model discloses a controlled circuit of wind turbine set backup power supply, which realizes the expected automatic controlled closed-loop operation of the wind turbine set backup power supply through the connection timing sequence between the circuits, does not need additional manual operation and maintenance intervention after the power grid is restored, improves the reliability of the wind turbine set, reduces the downtime of the wind turbine set, and significantly reduces the operation and maintenance cost of the wind turbine set.

[0006] Therefore, the utility model adopts the following technical solutions:

[0007] A controlled circuit of a wind turbine backup power supply includes a grid power supply detection circuit, a flyback power supply single trigger starting circuit, a high-voltage flyback switching power supply circuit, a BOOST circuit, an LLC power supply circuit, and a constant current charging power supply circuit, wherein,

[0008] The grid power supply detection circuit is connected with a grid three-phase voltage, is used for monitoring a grid voltage state in real time, and an output end of the grid power supply detection circuit is connected to the flyback power supply single trigger starting circuit;

[0009] The flyback power supply single trigger starting circuit is connected between a direct current bus voltage positive pole and a 0 voltage reference point, and is connected to a RUN signal indicating an LLC power supply circuit working state;

[0010] It should be noted that the flyback power supply single trigger starting circuit described in the application is used to stop the flyback power supply circuit from working and outputting, so that the flyback power supply starting circuit enters a reset state; on the contrary, an invalid RUN signal will unlock the flyback power supply circuit, so that it enters a ready working state and starts working after the next three-phase grid voltage is normally inputted;

[0011] The high-voltage flyback switching power supply circuit is connected between the direct current bus voltage positive pole and the 0 voltage reference point, and an output end of the high-voltage flyback switching power supply circuit is connected to the LLC power supply circuit;

[0012] It should be noted that the high-voltage flyback switching power supply circuit described in the application is used to provide necessary voltage for the LLC power supply circuit, so that the LLC power supply circuit can normally work.

[0013] The BOOST circuit is connected between the direct current bus voltage positive pole and the LLC power supply circuit, and the RUN signal is connected to a control end of the BOOST circuit; when the LLC power supply circuit starts and normally runs, the BOOST circuit is self-locked, so as to maintain the circuit voltage output of the LLC power supply circuit and guarantee continuous running of the LLC power supply circuit;

[0014] It should be noted that the BOOST circuit described in the application is used to provide stable direct current output voltage at the output end when the grid three-phase voltage fluctuates in a wide range, and the LLC power supply circuit described in the application is mainly used to convert high-voltage high-efficiency isolation into low voltage required by an electronic circuit working;

[0015] The constant current charging power supply circuit is connected between the direct current bus voltage positive pole and the backup power supply, and a DSP circuit is arranged between the constant current charging power supply circuit and a Shut down control pin of the LLC power supply circuit; the DSP circuit selectively sends a Shunt down signal to the LLC power supply circuit, and is used for selectively closing the voltage output of the LLC power supply circuit;

[0016] The backup power source is connected between the positive pole of the DC bus voltage and the LLC power supply circuit.

[0017] Preferably, when the voltage output of the LLC power supply circuit is turned off, the RUN signal will disappear; wherein, when the RUN signal disappears, the BOOST circuit is automatically turned off, and the flyback power supply single trigger starting circuit is reset, so that the output of the flyback power supply single trigger starting circuit is turned off.

[0018] Preferably, the grid power supply detection circuit comprises a current limiting resistor and an optocoupler; wherein, the three-phase grid voltage is respectively connected to the positive pole of the first transistor, the second transistor and the third transistor, the negative poles of the first transistor, the second transistor and the third transistor are connected in parallel, and then connected to the current limiting resistor; the other end of the current limiting resistor is connected to the positive pole of the light emitting diode side of the optocoupler, and the negative pole of the light emitting diode side of the optocoupler is connected to the negative pole of the voltage, and the output end of the optocoupler is connected to the flyback power supply single trigger starting circuit.

[0019] Preferably, the flyback power supply single trigger starting circuit comprises a first resistor, a first diode, a first capacitor, a second resistor, a first field effect transistor; wherein,

[0020] The first resistor is connected between the positive pole of the DC bus voltage and the cathode of the first diode, and the anode of the first diode is connected to the 0 voltage reference point;

[0021] The first capacitor, the second resistor and the first diode are connected in parallel respectively;

[0022] The drain of the first field effect transistor is connected to the cathode of the first diode, and a third resistor is arranged between the insulated gate and the drain of the first field effect transistor, and the source is connected to the high-voltage flyback switching power supply circuit;

[0023] The drain of the first field effect transistor is connected to the source of the second field effect transistor, the drain of the second field effect transistor is connected to the second capacitor and the fourth resistor in sequence, the other end of the fourth resistor is connected to the 0 voltage reference point; at the same time, the drain of the second field effect transistor is connected to the C pole of the triode side of the optocoupler through the fifth resistor, and the positive pole of the second capacitor is connected to the E pole of the triode side of the optocoupler through the sixth resistor;

[0024] The RUN signal is connected to the insulated gate of the second field effect transistor.

[0025] Preferably, the high-voltage flyback switching power supply circuit comprises a seventh resistor, a second diode and a third diode connected in sequence, and a switching power supply chip, wherein,

[0026] The seventh resistor is connected to the positive pole of the DC bus voltage, the positive pole of the third diode is connected to the 0 voltage reference point, and the negative pole of the third diode is connected to the positive pole of the second diode;

[0027] The negative pole of the third diode is connected to the drain of the third field effect transistor and the insulated gate of the fourth field effect transistor, respectively, the source of the third field effect transistor is connected to the positive pole of the third diode, and the insulated gate of the third field effect transistor is connected to the source of the first field effect transistor;

[0028] The drain of the fourth field effect transistor is connected to one end of the primary side of the high-frequency transformer, the other end of the primary side of the high-frequency transformer is connected to the positive pole of the DC bus voltage, and the fourth diode is connected in parallel between the source of the fourth field effect transistor and the insulated gate of the fourth field effect transistor;

[0029] The source of the fourth field effect transistor is connected to the drain pin of the internal integrated switching tube in the switching power supply chip;

[0030] The output pin of the switching power supply chip is connected to the LLC power supply circuit.

[0031] Preferably, a fifth field effect transistor is arranged between the LLC power supply circuit and the RUN signal output end, wherein the insulated gate of the fifth field effect transistor is connected to the output end of the voltage stabilizing diode, the drain of the fifth field effect transistor is connected to the LLC power supply circuit and connected to the input end of the voltage stabilizing diode through a resistance-capacitance network, the source of the fifth field effect transistor is connected to the positive pole of the light-emitting diode, and the negative pole of the light-emitting diode is connected to the RUN signal output end; wherein the resistance-capacitance network includes an eighth resistor and a third capacitor connected between the drain of the fifth field effect transistor and the input end of the voltage stabilizing diode, and the connection point between the eighth resistor and the third capacitor is connected to the insulated gate of the fifth field effect transistor, the connection point between the third capacitor and the input end of the voltage stabilizing diode is connected to the drain of the fifth field effect transistor through a ninth resistor; in actual work, when the LLC power supply circuit works unstably, the voltage of the drain of the fifth field effect transistor Q5 is unstable, the fifth field effect transistor Q5 will not be turned on, and the RUN signal is invalid. Only when the LLC power supply circuit works stably, the fifth field effect transistor Q5 will be turned on, the RUN signal is valid, and it belongs to the reliability circuit structure design. The light-emitting diode H1 is used to indicate the working state of the LLC power supply circuit. Specifically, when the light-emitting diode H1 light is on, it represents normal work, otherwise, the light is off, which represents abnormal work or no work.

[0032] Preferably, a ninth resistor is arranged between the negative pole of the light-emitting diode and the RUN signal output end.

[0033] Preferably, a pull-down resistor is arranged between the negative electrode of the light-emitting diode and the ninth resistor, and the other end of the pull-down resistor is connected to a 0-voltage reference point; preferably, a fourth capacitor is arranged between the ninth resistor and the RUN signal output end, and the other end of the fourth capacitor is connected to the 0-voltage reference point.

[0034] Preferably, a fifth diode is arranged between one end of the backup power supply and the DC bus voltage positive electrode, the positive electrode of the fifth diode is connected to the backup power supply, and the negative electrode of the fifth diode is connected to the DC bus voltage positive electrode; a sixth diode is arranged between the other end of the backup power supply and the 0-voltage reference point, the positive electrode of the sixth diode is connected to the 0-voltage reference point, and the negative electrode of the sixth diode is connected to the backup power supply.

[0035] It should be noted that the BOOST circuit, LLC power supply circuit, DSP circuit and constant-current charging power supply circuit involved in the utility model are all common knowledge of those skilled in the art, and this part is not an independent innovation content of the application, and the specific circuit components and connection schemes thereof are not particularly limited in the application, and therefore the components used in the circuit are not expanded in detail.

[0036] The utility model discloses a specific wind generating set backup power supply controlled circuit adopts a small amount of components to constitute each functional circuit, realizes the expected automatic controlled closed loop operation of wind generating set backup power supply through the connection time sequence between each circuit, does not need additional manual operation intervention after the power grid outage recovery, improves the reliability of wind generating set, reduces the unit downtime, and significantly reduces the operation and maintenance cost of wind turbine. BRIEF DESCRIPTION OF DRAWINGS

[0037] Figure 1 It is the controlled circuit connection structure schematic drawing of wind generating set backup power supply under the specific embodiment of the application;

[0038] Figure 2 It is the connection structure schematic drawing of grid power supply detection circuit A under the specific embodiment of the application;

[0039] Figure 3 It is the connection structure schematic drawing of flyback power supply single trigger starting circuit B (referred to as "flyback power supply circuit") under the specific embodiment of the application;

[0040] Figure 4 It is the connection structure schematic drawing of high-voltage flyback switching power supply circuit C under the specific embodiment of the application;

[0041] Figure 5 It is the connection structure schematic drawing of circuit D between LLC power supply circuit and RUN signal output end under the specific embodiment of the application. DETAILED DESCRIPTION

[0042] The utility model discloses an embodiment of wind generating set backup power supply's controlled circuit, including power supply detection circuit, flyback power supply single trigger starting circuit, high voltage flyback switching power supply circuit, BOOST circuit, LLC power supply circuit and constant current charging power supply circuit, wherein, power supply detection circuit is connected with the power grid three -phase voltage, is used for carrying out real -time monitoring to the power grid voltage state, and the output of power supply detection circuit inserts flyback power supply single trigger starting circuit, flyback power supply single trigger starting circuit is connected between direct current bus voltage positive pole and 0 voltage reference point, and its access RUN signal of indication LLC power supply circuit operating state, high voltage flyback switching power supply circuit is connected between direct current bus voltage positive pole and 0 voltage reference point, and its output inserts LLC power supply circuit, BOOST circuit is connected between direct current bus voltage positive pole and LLC power supply circuit, and RUN signal inserts the control end of BOOST circuit, when LLC power supply circuit starts, normal operation BOOST circuit self -locking, maintains the circuit voltage output of LLC power supply circuit to guarantee its continuous operation, constant current charging power supply circuit is connected between direct current bus voltage positive pole and backup power supply, and its between LLC power supply circuit's Shut down control pin is equipped with DSP circuit, and DSP circuit is selectively sent Shunt down signal to LLC power supply circuit, is used for selectively closing the voltage output of LLC power supply circuit, and backup power supply is connected between direct current bus voltage positive pole and LLC power supply circuit.

[0043] In order to more clearly illustrate the technical scheme in the embodiments of the present application or the prior art, the drawings needed to be used in the embodiments or the prior art description will be briefly introduced as follows. Obviously, the drawings in the following description are only some embodiments described in the present application, and for those skilled in the art, other drawings can also be obtained from these drawings without creative labor.

[0044] Please refer to Figure 1 and combine Figure 2 , Figure 3 , Figure 4 and Figure 5 , the present embodiment provides a kind of according to wind generating set backup power supply's controlled circuit, including power supply detection circuit ( Figure 1 marked as "A"), flyback power supply single trigger starting circuit ( Figure 1 marked as "B"), high voltage flyback switching power supply circuit ( Figure 1The grid power detection circuit is connected with three-phase grid voltage, is used for monitoring grid voltage state in real time, and an output end of the grid power detection circuit is connected with the single-shot trigger starting circuit of the flyback power supply; the single-shot trigger starting circuit of the flyback power supply is connected between the positive pole UB+ of the DC bus voltage and the 0 voltage reference point GND_Primary, and the RUN signal indicating the working state of the LLC power supply circuit is connected with the single-shot trigger starting circuit; the single-shot trigger starting circuit of the flyback power supply circuit in the embodiment is used for stopping the flyback power supply circuit from working, stopping output, and making the flyback power supply starting circuit enter a reset state; on the contrary, the invalid RUN signal will unlock the flyback power supply circuit, and make it enter a working preparation state, so as to start working next time after the three-phase grid voltage is normally input.

[0045] In the embodiment, the high-voltage flyback switching power supply circuit is connected between the positive pole UB+ of the DC bus voltage and the 0 voltage reference point GND_Primary, and an output end of the high-voltage flyback switching power supply circuit is connected with the LLC power supply circuit; the high-voltage flyback switching power supply circuit in the embodiment is used for providing necessary voltage for the LLC power supply circuit, so that the LLC power supply circuit can normally work.

[0046] In the embodiment, the BOOST circuit is connected between the positive pole UB+ of the DC bus voltage and the LLC power supply circuit, and the RUN signal is connected with a control end of the BOOST circuit; when the LLC power supply circuit starts and normally works, the BOOST circuit is self-locked, the circuit voltage output of the LLC power supply circuit is maintained, and the continuous working of the LLC power supply circuit is guaranteed; the BOOST circuit in the embodiment is used for providing stable DC output voltage (preferably, in the embodiment, the DC output voltage is 740V) at the output end when the three-phase grid voltage fluctuates in a wide range; the LLC power supply circuit in the embodiment is mainly used for converting high-voltage high-efficiency isolation into DC low voltage (preferably, in the embodiment, the DC low voltage required by the electronic circuit working is 24V) required by the electronic circuit working.

[0047] In the embodiment, the constant-current charging power supply circuit is connected between the positive pole UB+ of the DC bus voltage and the backup power supply, and a DSP circuit is arranged between the constant-current charging power supply circuit and the Shunt down control pin of the LLC power supply circuit; the DSP circuit is used for selectively sending the Shunt down signal to the LLC power supply circuit, so as to selectively close the voltage output of the LLC power supply circuit; the backup power supply is connected between the positive pole UB+ of the DC bus voltage and the LLC power supply circuit.

[0048] Preferably, in the present embodiment, when the voltage output of the LLC power supply circuit is turned off, the RUN signal will disappear accordingly; wherein, when the RUN signal disappears, the BOOST circuit is automatically turned off output, and at the same time the flyback power supply single trigger starting circuit is reset, so that the output of the flyback power supply single trigger starting circuit is turned off.

[0049] Preferably, in the present embodiment, the grid power supply detection circuit comprises a current limiting resistor Rx and an optocoupler OK1; wherein, the grid three-phase voltage L1, L2, L3 correspondingly connect the positive terminal of the first transistor V1, the second transistor V2 and the third transistor V3, and the negative terminal of the first transistor V1, the second transistor V2 and the third transistor V3 are connected in parallel and then connected to the current limiting resistor Rx; the other end of the current limiting resistor Rx is connected to the positive electrode of the light emitting diode side of the optocoupler OK1, and the negative electrode of the light emitting diode side of the optocoupler OK1 is connected to the negative voltage UB, and the output end of the optocoupler OK1 is connected to the flyback power supply single trigger starting circuit.

[0050] Preferably, in the present embodiment, the flyback power supply single trigger starting circuit comprises a first resistor Ry, a first diode D9, a first capacitor C2, a second resistor R11 and a first field effect transistor Q2; wherein, the first resistor Ry is connected between the DC bus voltage positive electrode UB+ and the cathode of the first diode D9, the anode of the first diode D9 is connected to the 0 voltage reference point GND_Primary; the first capacitor C2, the second resistor R11 and the first diode D9 are connected in parallel respectively; the drain of the first field effect transistor Q2 is connected to the cathode of the first diode D9, and a third resistor R5 is arranged between the insulated gate and the drain of the first field effect transistor Q2, and the source is connected to the high-voltage flyback switching power supply circuit; the drain of the first field effect transistor Q2 is connected to the source of the second field effect transistor Q4, the drain of the second field effect transistor Q4 is connected to the second capacitor C6 and the fourth resistor R23 in turn, and the other end of the fourth resistor R23 is connected to the 0 voltage reference point GND_Primary; at the same time, the drain of the second field effect transistor Q4 is connected to the C pole of the triode side of the optocoupler OK1 through the fifth resistor R17, and the positive electrode of the second capacitor C6 is connected to the E pole of the triode side of the optocoupler OK1 through the sixth resistor R20; the RUN signal is connected to the insulated gate of the second field effect transistor Q4.

[0051] Preferably, in this embodiment, the high-voltage flyback switching power supply circuit includes a seventh resistor R2, a second diode D2, and a third diode D3 connected in sequence, and a switching power supply chip U1. The seventh resistor R2 is connected to the positive terminal of the DC bus voltage UB+, the anode of the third diode D3 is connected to the 0 voltage reference point GND_Primary, and its cathode is connected to the anode of the second diode D2. The cathode of the third diode D3 is connected to the drain of the third field-effect transistor Q3 and the insulated gate of the fourth field-effect transistor Q1, respectively. The source of the third field-effect transistor Q3... The anode of the fourth field-effect transistor Q1 is connected to the anode of the third diode D3, and its insulated gate is connected to the source of the first field-effect transistor Q2; the drain of the fourth field-effect transistor Q1 is connected to one end of the primary side of the high-frequency transformer T1; the other end of the primary side of the high-frequency transformer T1 is connected to the positive terminal UB+ of the DC bus voltage; the fourth diode D4 is connected in parallel between the source and the insulated gate of the fourth field-effect transistor Q1; the source of the fourth field-effect transistor Q1 is connected to the drain pin of the internal integrated switching transistor in the switching power supply chip U1; the output pin of the switching power supply chip U1 is connected to the LLC power supply circuit.

[0052] Preferably, in this embodiment, please refer to [reference needed]. Figure 5 The circuit shown is between the LLC power supply circuit and the RUN signal output terminal. Figure 1 Marked as "D"), a fifth field-effect transistor Q5 is provided between the LLC power supply circuit and the RUN signal output terminal. The insulated gate of the fifth field-effect transistor Q5 is connected to the cathode of the Zener diode U2, its drain is connected to the LLC power supply circuit, and is connected to the input terminal of the Zener diode U2 through a resistor-capacitor network. Its source is connected to the anode of an LED H1, and the cathode of the LED H1 is connected to the RUN signal output terminal. The resistor-capacitor network includes an eighth resistor R24 ​​and a third capacitor C8 connected between the drain of the fifth field-effect transistor Q5 and the input terminal of the Zener diode U2. The connection point between the eighth resistor R24 ​​and the third capacitor C8 is connected to the fifth field-effect transistor. The insulated gate of Q5, the connection point between the third capacitor C8 and the input terminal of the Zener diode U2, is connected to the drain of the fifth MOSFET Q5 through the ninth resistor R25. In actual operation, when the LLC power supply circuit is unstable, the voltage at the drain of the fifth MOSFET Q5 is unstable, the fifth MOSFET Q5 will not conduct, and the RUN signal will be invalid. Only when the LLC power supply circuit is working stably will the fifth MOSFET Q5 conduct and the RUN signal be valid. This is a reliable circuit structure design. The LED H1 is used to indicate the working status of the LLC power supply circuit. Specifically, when the LED H1 is lit, it means that it is working normally; conversely, when the light is off, it means that it is malfunctioning or not working.

[0053] Further preferably, in the embodiment, a ninth resistor R18 is arranged between the negative electrode of the light-emitting diode H1 and the RUN signal output end; a pull-down resistor R22 is arranged between the negative electrode of the light-emitting diode H1 and the ninth resistor R18, and the other end of the pull-down resistor R22 is connected to the 0-voltage reference point GND_Primary; preferably, a fourth capacitor C7 is arranged between the ninth resistor R18 and the RUN signal output end, and the other end of the fourth capacitor C7 is connected to the 0-voltage reference point GND_Primary.

[0054] Further preferably, in the embodiment, a fifth diode D1 is arranged between one end of the backup power supply and the DC bus voltage positive pole UB+, the positive pole of the fifth diode D1 is connected to the backup power supply, and the negative pole of the fifth diode D1 is connected to the DC bus voltage positive pole UB+; a sixth diode D10 is arranged between the other end of the backup power supply and the 0-voltage reference point GND_Primary, the positive pole of the sixth diode D10 is connected to the 0-voltage reference point GND_Primary, and the negative pole of the sixth diode D10 is connected to the backup power supply.

[0055] Preferably, the embodiment also provides a controlled method of a backup power supply of a wind turbine generator, which adopts the controlled circuit of the backup power supply of the wind turbine generator according to the above embodiment, and when the grid voltage is normally powered, the backup power supply voltage of the wind turbine generator is maintained within a preset voltage range, so as to ensure that the backup power supply always maintains enough energy required to complete the blade feathering process; when the grid is powered off, after the blade feathering is completed, if it is monitored that the grid is still in a powered-off state, the backup power supply is deeply discharged to protect the backup power supply from being damaged due to the depletion of the electric quantity after the backup power supply is continuously discharged.

[0056] Preferably, in the embodiment, when the grid voltage is normally powered, after the blade feathering is completed, if it is monitored that the backup power supply voltage is less than a preset early warning voltage minimum value, the backup power supply is charged in a constant current charging mode until it is monitored that the backup power supply voltage reaches a preset voltage maximum limit value, and the charging is stopped to protect the backup power supply from being overcharged; preferably, in the embodiment, the deep discharge protection includes: cutting off the load of the backup power supply to avoid continuous discharge of the backup power supply.

[0057] Preferably, in the embodiment, when the grid is powered off and then normally powered, the backup power supply automatically restores the controlled state when the grid voltage is normally powered: the backup power supply voltage of the wind turbine generator is maintained within a preset voltage range, so as to ensure that the backup power supply always maintains enough energy required to complete the blade feathering process.

[0058] In combination with the above implementation solutions of the embodiment, the following working process of the embodiment is further described.

[0059] ① When the three-phase voltage L1, L2, L3 input voltage is normal (i.e. normal power supply), the light emitting diode of the optocoupler OK1 is lit, the output end of the optocoupler OK1 is turned on, the flyback power supply circuit (i.e. the "flyback power supply single trigger starting circuit" described in the foregoing of the present application) is triggered to start working; when the flyback power supply circuit works normally, the output voltage of the flyback power supply circuit is connected to the LLC power supply circuit, the LLC power supply circuit starts to work under the control of the voltage, and the LLC power supply circuit starts to work,

[0060] The LLC power supply circuit starts to have an output voltage, and after the output voltage is stable, the RUN signal becomes effective, the effective RUN signal can maintain the stable work of the BOOST circuit and the LLC power supply circuit, and at the same time, the output of the flyback power supply circuit is stopped, and the flyback power supply circuit is reset; whether the BOOST circuit and the LLC power supply circuit work or not is only related to the DC bus voltage positive pole UB+; further, if the backup power supply voltage is less than the preset pre-warning voltage minimum value, the backup power supply is charged in a constant current charging mode until the backup power supply voltage reaches the preset voltage maximum limit value, and the charging is stopped to protect the backup power supply from overcharging

[0061] ② When the input voltage of the three-phase voltage L1, L2, L3 is powered off, the backup power supply (i.e. the battery shown in Figure 1 ), will automatically connect to the DC bus voltage positive pole UB+, and the drive of the wind turbine will complete the safety operation such as the blade feathering under the preset logic of the DSP program; after all the preset safety operations are completed, if it is monitored that the power grid is still in the powered-off state, the backup power supply is deeply discharged: the DSP outputs the Shut down signal, the LLC power supply circuit stops outputting voltage after receiving the effective Shut down signal, at this time, the RUN signal becomes invalid, the BOOST circuit stops working after receiving the invalid RUN signal, and the drive of the entire wind turbine enters the stop working state, thereby the load of the backup power supply becomes very small (equivalent to cutting off the load of the backup power supply), avoiding the continuous discharge of the backup power supply and the damage of the backup power supply due to the long time maintenance of the deep discharge state; at the same time, the invalid RUN signal will unlock the flyback power supply circuit, so that the flyback power supply circuit jumps out of the reset state and enters the preparation working state.

[0062] ③ When the input voltage of the three-phase voltage L1, L2, L3 is powered again, i.e. the normal power supply is restored, the working condition of the controlled circuit of the embodiment will jump to ①, and the logic of ①, ② and ③ will be repeated.

[0063] It is apparent for a person skilled in the art that the present application is not limited to the details of the above-described exemplary embodiments, but that it can be implemented in other concrete forms without departing from the spirit or the essential characteristics of the present application. Therefore, the embodiments should be considered as exemplary and non-limiting, the scope of the present application being defined by the claims appended hereto rather than by the above description, and all the changes which fall within the meaning and the scope of the equivalent elements of the claims are intended to be embraced therein. Any reference signs in the claims should not be construed as limiting the claims to the figures in which the reference signs are used.

[0064] Furthermore, it should be understood that although the present specification describes exemplary embodiments, not every embodiment contains only one independent technical solution, and the present specification is described in this way only for the sake of clarity, and a person skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that a person skilled in the art can understand.

Claims

1. A controlled circuit for a wind turbine generator system backup power supply, characterized by, The application relates to a power supply circuit, which comprises a power grid power supply detection circuit, a flyback power supply single-time trigger starting circuit, a high-voltage flyback switching power supply circuit, a BOOST circuit, an LLC power supply circuit and a constant-current charging power supply circuit. The power grid power supply detection circuit is connected with three-phase power grid voltage and used for monitoring power grid voltage state in real time, and an output end of the power grid power supply detection circuit is connected with the flyback power supply single-time trigger starting circuit. The flyback power supply single-time trigger starting circuit is connected between a direct-current bus voltage positive pole (UB+) and a 0 voltage reference point (GND_Primary), and a RUN signal indicating an LLC power supply circuit working state is connected with the flyback power supply single-time trigger starting circuit. The high-voltage flyback switching power supply circuit is connected between the direct-current bus voltage positive pole (UB+) and the 0 voltage reference point (GND_Primary), and an output end of the high-voltage flyback switching power supply circuit is connected with the LLC power supply circuit. The BOOST circuit is connected between the direct-current bus voltage positive pole (UB+) and the LLC power supply circuit, and the RUN signal is connected with a control end of the BOOST circuit; when the LLC power supply circuit is started and normally operated, the BOOST circuit is self-locked to maintain circuit voltage output of the LLC power supply circuit to guarantee continuous operation of the LLC power supply circuit. The constant-current charging power supply circuit is connected between the direct-current bus voltage positive pole (UB+) and a backup power supply, and a DSP circuit is arranged between the constant-current charging power supply circuit and a Shunt down control pin of the LLC power supply circuit; the DSP circuit selectively sends a Shunt down signal to the LLC power supply circuit to selectively close voltage output of the LLC power supply circuit.

2. The controlled circuit of a wind turbine generator set backup power supply according to claim 1, characterized in that, When voltage output of the LLC power supply circuit is closed, the RUN signal disappears; when the RUN signal disappears, the BOOST circuit is automatically closed to output, and the flyback power supply single-time trigger starting circuit is reset to close output of the flyback power supply single-time trigger starting circuit.

3. The controlled circuit of the wind turbine generator set backup power supply according to claim 1, characterized by, The power grid power supply detection circuit comprises a current-limiting resistor (Rx) and an optical coupler (OK1); three-phase power grid voltage (L1, L2, L3) is respectively connected with positive poles of first, second and third transistors (V1, V2, V3), negative poles of the first, second and third transistors (V1, V2, V3) are connected in parallel and then connected with the current-limiting resistor (Rx); another end of the current-limiting resistor (Rx) is connected with a positive pole of a light-emitting diode side of the optical coupler (OK1), a negative pole of the light-emitting diode side of the optical coupler (OK1) is connected with a voltage negative pole (-UB), and an output end of the optical coupler (OK1) is connected with the flyback power supply single-time trigger starting circuit.

4. The controlled circuit of the wind turbine generator set backup power supply according to claim 1, characterized by, The flyback power supply single-time trigger starting circuit comprises a first resistor (Ry), a first diode (D9), a first capacitor (C2), a second resistor (R11) and a first field effect transistor (Q2); The first resistor (Ry) is connected between the positive pole of the DC bus voltage (UB+) and the cathode of the first diode (D9), and the anode of the first diode (D9) is connected to the 0 voltage reference point (GND_Primary); The first capacitor (C2), the second resistor (R11) and the first diode (D9) are connected in parallel respectively; The drain of the first field effect transistor (Q2) is connected to the cathode of the first diode (D9), and the insulating gate thereof is provided with the third resistor (R5) between the drain thereof, and the source thereof is connected to the high-voltage flyback switching power supply circuit; The drain of the first field effect transistor (Q2) is connected to the source of the second field effect transistor (Q4), the drain of the second field effect transistor (Q4) is connected to the second capacitor (C6) and the fourth resistor (R23) in sequence, the other end of the fourth resistor (R23) is connected to the 0 voltage reference point (GND_Primary), and the drain of the second field effect transistor (Q4) is connected to the C pole of the triode side of the optocoupler (OK1) through the fifth resistor (R17), and the positive pole of the second capacitor (C6) is connected to the E pole of the triode side of the optocoupler (OK1) through the sixth resistor (R20); The RUN signal is connected to the insulating gate of the second field effect transistor (Q4).

5. The controlled circuit of the backup power supply for a wind turbine generator system according to claim 4, characterized in that, The high-voltage flyback switching power supply circuit comprises the seventh resistor (R2), the second diode (D2) and the third diode (D3) connected in sequence, and the switching power supply chip (U1), wherein, The seventh resistor (R2) is connected to the positive pole of the DC bus voltage (UB+), the positive pole of the third diode (D3) is connected to the 0 voltage reference point (GND_Primary), and the cathode thereof is connected to the anode of the second diode (D2); The cathode of the third diode (D3) is connected to the drain of the third field effect transistor (Q3) and the insulating gate of the fourth field effect transistor (Q1) respectively, the source of the third field effect transistor (Q3) is connected to the anode of the third diode (D3), and the insulating gate thereof is connected to the source of the first field effect transistor (Q2); The drain of the fourth field effect transistor (Q1) is connected to one end of the primary side of the high-frequency transformer (T1), the other end of the primary side of the high-frequency transformer (T1) is connected to the positive pole of the DC bus voltage (UB+), and the fourth diode (D4) is connected in parallel between the source of the fourth field effect transistor (Q1) and the insulating gate thereof; The source of the fourth field effect transistor (Q1) is connected to the drain pin of the internal integrated switching tube in the switching power supply chip (U1); The output pin of the switching power supply chip (U1) is connected to the LLC power supply circuit.

6. The controlled circuit of a wind turbine generator set backup power supply according to claim 1, characterized by, The fifth field effect transistor (Q5) is arranged between the LLC power supply circuit and the RUN signal output end, wherein the insulated gate of the fifth field effect transistor (Q5) is connected with the output end (cathode) of the voltage stabilizing diode (U2), the drain thereof is connected to the LLC power supply circuit and connected to the input end of the voltage stabilizing diode (U2) through a resistance-capacitance network, and the source thereof is connected to the anode of the light emitting diode (H1), and the cathode of the light emitting diode (H1) is connected with the RUN signal output end; wherein the resistance-capacitance network comprises an eighth resistor (R24) and a third capacitor (C8) connected between the drain of the fifth field effect transistor (Q5) and the input end of the voltage stabilizing diode (U2), and the connection point between the eighth resistor (R24) and the third capacitor (C8) is connected to the insulated gate of the fifth field effect transistor (Q5), and the connection point between the third capacitor (C8) and the input end of the voltage stabilizing diode (U2) is connected to the drain of the fifth field effect transistor (Q5) through a ninth resistor (R25).

7. The controlled circuit of a wind turbine generator set backup power supply according to claim 6, characterized by, The ninth resistor (R18) is arranged between the cathode of the light emitting diode (H1) and the RUN signal output end.

8. The controlled circuit of a wind turbine generator set backup power supply according to claim 7, characterized by, The pull-down resistor (R22) is arranged between the cathode of the light emitting diode (H1) and the ninth resistor (R18), and the other end of the pull-down resistor (R22) is connected to the 0 voltage reference point (GND_Primary).

9. The controlled circuit of the backup power supply for a wind turbine generator system according to claim 7, characterized in that, The fourth capacitor (C7) is arranged between the ninth resistor (R18) and the RUN signal output end, and the other end of the fourth capacitor (C7) is connected to the 0 voltage reference point (GND_Primary).

10. The controlled circuit of a wind turbine generator set backup power supply according to claim 1, characterized by, The fifth diode (D1) is arranged between one end of the backup power supply and the direct current bus voltage positive electrode (UB+), the positive electrode of the fifth diode (D1) is connected with the backup power supply, and the negative electrode thereof is connected with the direct current bus voltage positive electrode (UB+); the sixth diode (D10) is arranged between the other end of the backup power supply and the 0 voltage reference point (GND_Primary), the positive electrode of the sixth diode (D10) is connected with the 0 voltage reference point (GND_Primary), and the negative electrode thereof is connected with the backup power supply.

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