CN211343213U - Full-speed-domain braking device of permanent magnet synchronous power generation fan - Google Patents
Full-speed-domain braking device of permanent magnet synchronous power generation fan Download PDFInfo
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- CN211343213U CN211343213U CN202020096842.2U CN202020096842U CN211343213U CN 211343213 U CN211343213 U CN 211343213U CN 202020096842 U CN202020096842 U CN 202020096842U CN 211343213 U CN211343213 U CN 211343213U
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Abstract
The utility model discloses a permanent magnetism synchronous power generation fan full speed territory arresting gear, include: an isolating switch; the current input end of the current detector is connected with the isolating switch; the detection end of the voltage detector is connected with the isolating switch and is used for detecting the input voltage, the voltage frequency and the voltage phase; the main contact of the short-circuit contactor is connected with the current output end of the current detector and is used for short-circuiting the current output of the power generation fan according to the control signal; the brake resistor is connected with the current output end of the current detector; the current regulator is used for regulating the current on the brake resistor according to the control signal; and the controller is used for calculating the rotating speed of the power generation fan according to the voltage frequency and sending out a control signal according to the rotating speed of the power generation fan and/or the received instruction signal. The utility model discloses an insert brake resistance at the current output end of electricity generation fan, consume the kinetic energy and the inspiratory wind energy of electricity generation fan, produce the electromagnetic braking force simultaneously, realized that the safety system of electricity generation fan stops.
Description
Technical Field
The utility model belongs to wind power generation equipment field especially relates to a permanent magnetism synchronous power generation fan full speed territory arresting gear.
Background
The motor shaft of the permanent magnet synchronous direct-drive synchronous power generation fan is directly connected with the wheel box between the main shafts of the fan blade rotating wheels, and the wheel box is not arranged, so that the reliability is high, and the maintenance amount is small. In addition, the permanent magnet synchronous motor adopts a full-power converter to perform energy conversion, so that low voltage ride through is easier to realize. Because of these numerous advantages, the permanent magnet direct drive generator gradually replaces the doubly-fed wind generator and becomes the mainstream direction of high-power wind power generation. At present, a braking system of a direct-drive wind driven generator mainly depends on controlling a blade to realize aerodynamic braking, and mechanical braking is applied at low speed to realize braking.
When the fan is used for grid-connected power generation, the fan controls the angle of the blade through the pitch system so as to capture power of the fan, the fan motor and the converter convert wind energy into electric energy to be transmitted to a power grid, and meanwhile the motor generates electromagnetic braking force to balance the thrust of wind to the blade, so that the rotating speed of the fan is maintained in a safe range.
If the fan converter is normally stopped or the fan is disconnected due to the failure of a power grid or the failure of other systems of the fan, the rotating speed of the fan rises due to the absence of electromagnetic braking force. If the pitch system is normal, the angle of the blades is controlled to enable the blades to be parallel to the wind direction, air does not act as thrust but as braking force on the blades any more, and the rotating speed of the fan is reduced due to the braking force and stopped.
The fan is provided with three blades (or only two blades in a single blade), when a blade changing system of one blade fails and can not collect blade, air generates thrust on one blade, and generates braking force on the other two blades, wherein the braking force is greater than the thrust, and the fan can still be safely stopped. However, if two or three blade systems fail simultaneously and can not receive the slurry, the total thrust of the three blades is larger than the braking force, the rotating speed of the fan continuously rises, and finally the fan collapses. Although the above-mentioned situations are of little probability, once they occur, they cause significant economic losses, sometimes accompanied by human casualties. For many years, the collapse accidents of the fans caused by China are rare.
In order to prevent the damage caused by overspeed of the draught fans with more than two slurry changing systems in fault, a method of increasing mechanical braking force is also adopted as backup braking of aerodynamic braking, and because the main shaft is low in rotating speed and large in torque, the volume and the weight of the braking system are large. Meanwhile, the mechanical brake usually adopts hydraulic pressure to generate braking force, so that the workload of maintenance is increased. This method is therefore not used in practice.
Another scene that the fan is easy to have safety accidents is that during maintenance operation, all power supplies are cut off, the fan only depends on mechanical braking to ensure the static braking force of the fan, if the blades are not in a slurry state and meet strong wind, the thrust of the fan blades is greater than that of the mechanical braking, and the rotating speed of the fan can continuously rise to cause serious safety accidents of machine damage and human death.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to overcome prior art not enough, provide a permanent magnetism synchronous power generation fan full speed territory arresting gear, insert braking resistance through the current output end at the electricity generation fan, with the energy with the form release of heat energy to the atmosphere go, consume the kinetic energy and the inspiratory wind energy of electricity generation fan, produce the electromagnetic braking force simultaneously, realize the safety system of electricity generation fan and stop.
The purpose of the utility model is realized through the following technical scheme: a full-speed domain braking device of a permanent magnet synchronous generator fan comprises:
the isolating switch is used for disconnecting/connecting the brake part and the current output end of the power generation fan;
the current detector is connected with the isolating switch at a current input end and used for detecting input current and sending a detection result to the controller;
the detection end of the voltage detector is connected with the isolating switch and is used for detecting the input voltage, the voltage frequency and the voltage phase and sending the detection result to the controller;
the main contact of the short-circuit contactor is connected with the current output end of the current detector and is used for short-circuiting the current output of the power generation fan according to a control signal sent by the controller;
the brake resistor is connected with the current output end of the current detector;
the current regulator is used for regulating the current on the brake resistor according to a control signal sent by the controller;
and the controller is used for calculating the rotating speed of the power generation fan according to the voltage frequency and sending out a control signal according to the rotating speed of the power generation fan and/or the received instruction signal.
Preferably, the current detector includes:
the current input end of the first current sensor is connected with the A-phase line binding post of the isolating switch, and the signal output end of the first current sensor is connected with the signal input end of the controller and used for detecting A-phase current;
the current input end of the second current sensor is connected with a B-phase line binding post of the isolating switch, and the signal output end of the second current sensor is connected with the signal input end of the controller and used for detecting B-phase current;
and the current input end of the third current sensor is connected with a C-phase wiring terminal of the isolating switch, and the signal output end of the third current sensor is connected with the signal input end of the controller and used for detecting C-phase current.
Preferably, the phase a main contact of the short-circuit contactor is connected to the current output terminal of the first current sensor, the phase B main contact of the short-circuit contactor is connected to the current output terminal of the second current sensor, the phase C main contact of the short-circuit contactor is connected to the current output terminal of the third current sensor, and the control signal input terminal of the short-circuit contactor is connected to the control signal output terminal of the controller.
Preferably, the current regulator comprises a first triac, a second triac and a third triac, and the braking resistor comprises a first resistor, a second resistor and a third resistor;
the first end of the first resistor is connected with the current output end of the first current sensor through a first bidirectional thyristor, and the control electrode of the first bidirectional thyristor is connected with the control signal output end of the controller; the first end of the second resistor is connected with the current output end of the second current sensor through a second bidirectional thyristor, and the control electrode of the second bidirectional thyristor is connected with the control signal output end of the controller; the first end of the third resistor is connected with the current output end of the third current sensor through a third bidirectional thyristor, and the control electrode of the third bidirectional thyristor is connected with the control signal output end of the controller; and the second end of the first resistor, the second end of the second resistor and the second end of the third resistor are connected to the same connection point.
Preferably, the current regulator includes first to sixth thyristors, and the braking resistor includes a first resistor;
the first end of the first resistor is respectively connected with the cathode of the first thyristor, the cathode of the third thyristor and the cathode of the fifth thyristor, and the second end of the first resistor is respectively connected with the anode of the second thyristor, the anode of the fourth thyristor and the anode of the sixth thyristor;
the anode of the first thyristor and the cathode of the sixth thyristor are both connected with the current output end of the first current sensor, the anode of the third thyristor and the cathode of the fourth thyristor are both connected with the current output end of the second current sensor, and the anode of the fifth thyristor and the cathode of the second thyristor are both connected with the current output end of the third current sensor;
and control electrodes of the first thyristor to the sixth thyristor are all connected with a control signal output end of the controller.
Preferably, the current regulator comprises a first diode to a seventh diode, a capacitor and a chopping switch power tube, and the brake resistor comprises a first resistor;
the drain electrode of the chopping switch power tube is respectively connected with the cathode of the first diode, the cathode of the third diode and the cathode of the fifth diode, the grid electrode of the chopping switch power tube is connected with the control signal output end of the controller, the source electrode of the chopping switch power tube is connected with the first end of the first resistor, and the second end of the first resistor is respectively connected with the anode of the second diode, the anode of the fourth diode and the anode of the sixth diode;
the anode of the first diode and the cathode of the sixth diode are both connected with the current output end of the first current sensor, the anode of the third diode and the cathode of the fourth diode are both connected with the current output end of the second current sensor, and the anode of the fifth diode and the cathode of the second diode are both connected with the current output end of the third current sensor;
the first end of the capacitor is connected with the drain electrode of the chopping switch power tube, and the second end of the capacitor is connected with the second end of the first resistor;
and the cathode of the seventh diode is connected with the source electrode of the chopping switch power tube, and the anode of the seventh diode is connected with the second end of the first resistor.
Preferably, the current regulator comprises N switching contactors, the brake resistor comprises N groups of resistors, N is more than or equal to 3, and the N switching contactors correspond to the N groups of resistors one by one;
each group of resistors comprises an A-phase resistor, a B-phase resistor and a C-phase resistor, the first end of the A-phase resistor is connected with the current output end of the first current sensor through an A-phase switching switch of the corresponding switching contactor, the first end of the B-phase resistor is connected with the current output end of the second current sensor through a B-phase switching switch of the corresponding switching contactor, the first end of the C-phase resistor is connected with the current output end of the third current sensor through a C-phase switching switch of the corresponding switching contactor, the second end of the A-phase resistor, the second end of the B-phase resistor and the second end of the C-phase resistor are connected to the same connection point, and the control signal input end of the switching contactor is connected with the control signal output end of the controller.
Preferably, the current regulator comprises N switching contactors, the brake resistor comprises N groups of resistors, N is more than or equal to 3, the N switching contactors and the N groups of resistors are in one-to-one correspondence, and control signal input ends of the switching contactors are connected with control signal output ends of the controller;
each group of resistors comprises an A-phase resistor, a B-phase resistor and a C-phase resistor, wherein the A-phase resistor is connected with an A-phase switching-in switch of the corresponding switching contactor in parallel, the B-phase resistor is connected with a B-phase switching-in switch of the corresponding switching contactor in parallel, and the C-phase resistor is connected with a C-phase switching-in switch of the corresponding switching contactor in parallel;
the second end of the A-phase resistor, the second end of the B-phase resistor and the second end of the C-phase resistor of the Nth group of resistors are connected to the same connection point;
the first end of the A-phase resistor of the first group of resistors is connected with the current output end of the first current sensor, and the A-phase resistor of the first group of resistors is connected with the A-phase resistor of the Nth group of resistors in series in sequence; the first end of the B-phase resistor of the first group of resistors is connected with the current output end of the first current sensor, and the B-phase resistor of the first group of resistors is connected with the B-phase resistor of the Nth group of resistors in series in sequence; the first end of the C-phase resistor of the first group of resistors is connected with the current output end of the first current sensor, and the C-phase resistor of the first group of resistors is connected with the C-phase resistor of the Nth group of resistors in series in sequence.
Preferably, the voltage detector is a voltage sensor, an A-phase detection end of the voltage sensor is connected with an A-phase wiring terminal of the isolating switch, a B-phase detection end of the voltage sensor is connected with a B-phase wiring terminal of the isolating switch, a C-phase detection end of the voltage sensor is connected with a C-phase wiring terminal of the isolating switch, and a signal output end of the voltage sensor is connected with a signal input end of the controller.
The utility model has the advantages that:
(1) the utility model discloses through insert the brake resistance at the current output end of electricity generation fan, go to energy release to the atmosphere in the form of heat energy, consumed the kinetic energy of electricity generation fan and the inhaled wind energy, produced the electromagnetic braking force simultaneously, realized the safety braking of electricity generation fan;
(2) the utility model adopts the electromagnetic torque of the power generation fan as the braking torque, can realize large braking force without adding a mechanical device, meets the braking requirement of the power generation fan when all pitch faults can not take up the pitch, has no mechanical abrasion during braking, and has small braking noise;
(3) the current regulator can realize the stepped regulation or the stepless regulation of the current on the brake resistor, reduce the impact of braking force in the regulation process and is beneficial to improving the stability of the system;
(4) when the rotating speed of the power generation fan is lower than a threshold value, the short-circuit contactor short-circuits the output of the power generation fan, and the power generation fan stops; because the power failure can still be kept closed after the short-circuit contactor is closed, after the power generation fan is stopped, even if the external main power supply is interrupted, the output of the power generation fan can still be in short circuit connection, the power generation fan is prevented from being pushed to rotate by wind power when the mechanical brake fails, and the static brake is realized.
Drawings
FIG. 1 is a block diagram of the present invention;
FIG. 2 is a schematic view of a brake part of the present invention;
FIG. 3 is a schematic view of another embodiment of the brake part of the present invention;
FIG. 4 is a schematic view of another embodiment of the brake part of the present invention;
FIG. 5 is a schematic view of another embodiment of the brake part of the present invention;
fig. 6 is a schematic view of another structure of the middle brake part of the present invention.
Detailed Description
The technical solution of the present invention will be described clearly and completely with reference to the following embodiments, and it should be understood that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. Based on the embodiments in the present invention, all other embodiments obtained by those skilled in the art without creative efforts belong to the protection scope of the present invention.
Referring to fig. 1 to 6, the present embodiment provides a full-speed braking device for a permanent magnet synchronous generator fan:
example one
As shown in FIG. 1, the full-speed domain braking device of the permanent magnet synchronous generator fan comprises an isolating switch, a current detector, a voltage detector, a short-circuit contactor, a braking resistor, a current regulator and a controller. The isolating switch QS is used for being connected with the current output end of the power generation fan, and the braking portion and the current output end of the power generation fan are disconnected or connected when equipment is overhauled by disconnecting or closing the isolating switch QS.
And the current detector is used for detecting the current input into the braking part and sending the detection result to the controller.
The detection end of the voltage detector is connected with the isolating switch, the signal output end of the voltage detector is connected with the signal input end of the controller, and the voltage detector is used for detecting input voltage, voltage frequency and voltage phase and sending the detection result to the controller.
The main contact of the short-circuit contactor KM0 is connected with the current output end of the current detector, and the short-circuit contactor KM0 is used for short-circuiting the current output of the power generation fan according to a control signal sent by the controller. For example, when the rotation speed of the power generation fan is reduced below a threshold value, the short-circuit contactor KM0 is closed, the output of the power generation fan is short-circuited, and the power generation fan is stopped. Because the output of the power generation fan is short-circuited, as long as the power generation fan is pushed by wind power to rotate, the power generation voltage of the power generation fan can form short-circuit current through internal short-circuit impedance, so that electromagnetic braking force is generated, and the power generation fan is kept in a relatively static state. The short-circuit contactor KM0 adopts an energy-saving contactor which can still be kept closed after being closed, and after the fan is stopped, the motor output can be short-circuited even if the external main power supply is interrupted, so that static braking is realized.
The braking resistor is connected with the current output end of the current detector, and energy is released to the atmosphere in a heat energy mode by connecting a resistor load to the current output end of the power generation fan, so that kinetic energy and absorbed wind energy of the power generation fan are consumed, electromagnetic braking force is generated, and safe braking of the power generation fan is realized.
The current regulator is used for regulating the current on the brake resistor according to a control signal sent by the controller, so that the rising stage of the electromagnetic braking force is smooth, and the stage is stable; the current regulator can adopt step regulation or stepless regulation.
The controller is used for calculating the rotating speed of the power generation fan according to the voltage frequency (the rotating speed of the synchronous motor is directly proportional to the frequency of the generator, and the rotating speed of the generator can be obtained according to the voltage frequency), and sending a control signal according to the rotating speed of the power generation fan and/or a received instruction signal.
Example two
A full-speed-domain braking device of a permanent magnet synchronous generator fan comprises an isolating switch, a current detector, a voltage detector, a short-circuit contactor, a braking resistor, a current regulator and a controller.
As shown in fig. 2, the input side in the figure is the output voltage of the permanent magnet synchronous generator fan, the current detector includes a first current sensor Ha, a second current sensor Hb, and a third current sensor Hc, the voltage detector includes a voltage sensor VT, the current regulator includes a first triac Ta, a second triac Tb, and a third triac Tc, and the braking resistor includes a first resistor R1, a second resistor R2, and a third resistor R3.
The current input end of the first current sensor Ha is connected with the A-phase line binding post of the isolating switch QS, the signal output end of the first current sensor Ha is connected with the signal input end of the controller, and the current output end of the first current sensor Ha is connected with the first end of the first resistor R1 through the first bidirectional thyristor Ta.
The current input end of the second current sensor Hb is connected with a B-phase line terminal of the isolating switch QS, the signal output end of the second current sensor Hb is connected with the signal input end of the controller, and the current output end of the second current sensor Hb is connected with the first end of the second resistor R2 through the second bidirectional thyristor Tb.
The current input end of the third current sensor Hc is connected with a C-phase line binding post of the isolating switch QS, the signal output end of the third current sensor Hc is connected with the signal input end of the controller, and the current output end of the third current sensor Hc is connected with the first end of the third resistor R3 through the third bidirectional thyristor Tc.
The detection end of the A phase of the voltage sensor VT is connected with a wiring terminal of the A phase line of the isolating switch QS, the detection end of the B phase of the voltage sensor VT is connected with a wiring terminal of the B phase line of the isolating switch QS, the detection end of the C phase of the voltage sensor VT is connected with a wiring terminal of the C phase line of the isolating switch QS, and the signal output end of the voltage sensor VT is connected with the signal input end of the controller.
The A-phase main contact of the short-circuit contactor KM0 is connected with the current output end of the first current sensor Ha, the B-phase main contact of the short-circuit contactor KM0 is connected with the current output end of the second current sensor Hb, the C-phase main contact of the short-circuit contactor KM0 is connected with the current output end of the third current sensor Hc, and the control signal input end of the short-circuit contactor KM0 is connected with the control signal output end of the controller.
The second end of the first resistor R1, the second end of the second resistor R2 and the second end of the third resistor R3 are connected to the same connection point.
The working process and the working principle of the embodiment are as follows:
when the power generation fan normally works, the isolating switch QS is in a closed state, the short-circuit contactor KM0 is disconnected, the controller (not shown in figure 2) blocks trigger pulses of the first bidirectional thyristor Ta, the second bidirectional thyristor Tb and the third bidirectional thyristor Tc, the first bidirectional thyristor Ta, the second bidirectional thyristor Tb and the third bidirectional thyristor Tc are in a blocking state, no current exists in the first braking resistor, the second braking resistor and the third braking resistor, the braking device does not influence the power generation current of the power generation fan, and extra braking force cannot be generated. When the controller detects that the power generation fan exceeds the speed limit (for example, due to the fault of a pitch system and the fan is off-grid) or the main controller connected with the power generation fan sends out an electromagnetic braking input command due to normal shutdown/fault shutdown, the controller sends control signals to the first bidirectional thyristor Ta, the second bidirectional thyristor Tb and the third bidirectional thyristor Tc, the conduction angles of the first bidirectional thyristor Ta, the second bidirectional thyristor Tb and the third bidirectional thyristor Tc are gradually increased, the current flowing through the braking resistor is also gradually increased to a set value, and the electromagnetic braking torque of the power generation fan is gradually increased to a set value.
Because the electromagnetic torque of the permanent magnet synchronous power generation fan is in direct proportion to the output current, the braking torque is gradually increased along with the increase of the current flowing through the braking resistor, and the electromagnetic torque also reaches a set value when the current flowing through the braking resistor reaches the set value. At this time, the permanent magnet synchronous generator fan is a generator, and its electromagnetic torque is opposite to the rotation direction, so the torque of the generator fan is a braking torque.
The first current sensor Ha is for detecting an a-phase input current, the second current sensor Hb is for detecting a B-phase input current, and the third current sensor Hc is for detecting a C-phase input current. The electromagnetic torque can be kept constant through closed-loop control, and the set electromagnetic torque given value is larger than the pushing torque generated by wind power to the blade, so that the rotating speed of the power generation fan is gradually reduced, and the voltage of the power generation fan is reduced. To keep the electromagnetic torque constant, the conduction angles of the first, second, and third triacs Ta, Tb, and Tc are increased stepwise up to the maximum conduction angle. At this time, the first triac Ta, the second triac Tb, and the third triac Tc are equivalent to the on state of the switch, and the braking resistors (the first resistor R1, the second resistor R2, and the third resistor R3) are directly connected to the output of the power generation fan.
When the rotating speed of the power generation fan is reduced to be lower than the threshold value, the short-circuit contactor KM0 is closed, the output of the power generation fan is in short circuit, and the power generation fan is stopped. Because the output of the power generation fan is short-circuited, as long as the power generation fan is pushed by wind power to rotate, the power generation voltage can form short-circuit current through internal short-circuit impedance, so that electromagnetic braking force is generated, and the power generation fan is kept in a relatively static state. The short-circuit contactor KM0 adopts a contactor (such as a contactor with the model CJC 20) which can still be closed after being closed, and can still short-circuit the output of the power generation fan under the condition of external total power supply interruption after the power generation fan is stopped, so that static braking is realized.
EXAMPLE III
A full-speed-domain braking device of a permanent magnet synchronous generator fan comprises an isolating switch, a current detector, a voltage detector, a short-circuit contactor, a braking resistor, a current regulator and a controller.
As shown in fig. 3, the input side in the figure is the output voltage of the permanent magnet synchronous generator fan, the current detector includes a first current sensor Ha, a second current sensor Hb and a third current sensor Hc, a current input end of the first current sensor Ha is connected with an a-phase terminal of the isolating switch QS, a current input end of the second current sensor Hb is connected with a B-phase terminal of the isolating switch QS, a current input end of the third current sensor Hc is connected with a C-phase terminal of the isolating switch QS, and signal output ends of the first current sensor Ha, the second current sensor Hb and the third current sensor Hc are all connected with a signal input end of the controller.
The voltage detector comprises a voltage sensor VT, wherein an A-phase detection end of the voltage sensor VT is connected with an A-phase wiring terminal of the isolating switch QS, a B-phase detection end of the voltage sensor VT is connected with a B-phase wiring terminal of the isolating switch QS, a C-phase detection end of the voltage sensor VT is connected with a C-phase wiring terminal of the isolating switch QS, and a signal output end of the voltage sensor VT is connected with a signal input end of the controller.
The A-phase main contact of the short-circuit contactor KM0 is connected with the current output end of the first current sensor Ha, the B-phase main contact of the short-circuit contactor KM0 is connected with the current output end of the second current sensor Hb, the C-phase main contact of the short-circuit contactor KM0 is connected with the current output end of the third current sensor Hc, and the control signal input end of the short-circuit contactor KM0 is connected with the control signal output end of the controller.
The operation principle of the current detector and the short-circuit contactor KM0 in this embodiment is the same as that in the second embodiment.
The current regulator includes first to sixth thyristors T1-T6, and the braking resistor includes a first resistor R1.
A first end of the first resistor R1 is connected to a cathode of the first thyristor T1, a cathode of the third thyristor T3, and a cathode of the fifth thyristor T5, respectively, and a second end of the first resistor R1 is connected to an anode of the second thyristor T2, an anode of the fourth thyristor T4, and an anode of the sixth thyristor T6, respectively.
The anode of the first thyristor T1 and the cathode of the sixth thyristor T6 are both connected to the current output terminal of the first current sensor Ha, the anode of the third thyristor T3 and the cathode of the fourth thyristor T4 are both connected to the current output terminal of the second current sensor Hb, and the anode of the fifth thyristor T5 and the cathode of the second thyristor T2 are both connected to the current output terminal of the third current sensor Hc; and control electrodes of the first thyristor T1 to the sixth thyristor T6 are all connected with a control signal output end of the controller.
In this embodiment, the first thyristor T1 to the sixth thyristor T6 form a three-phase fully controlled bridge, and the current on the brake resistor is adjusted by controlling the phase control angle of the three-phase fully controlled bridge, so as to realize stepless adjustment of the electromagnetic braking force.
Example four
A full-speed-domain braking device of a permanent magnet synchronous generator fan comprises an isolating switch, a current detector, a voltage detector, a short-circuit contactor, a braking resistor, a current regulator and a controller.
As shown in fig. 4, the input side in the figure is the output voltage of the permanent magnet synchronous generator fan, the current detector includes a first current sensor Ha, a second current sensor Hb and a third current sensor Hc, a current input end of the first current sensor Ha is connected with an a-phase terminal of the isolating switch QS, a current input end of the second current sensor Hb is connected with a B-phase terminal of the isolating switch QS, a current input end of the third current sensor Hc is connected with a C-phase terminal of the isolating switch QS, and signal output ends of the first current sensor Ha, the second current sensor Hb and the third current sensor Hc are all connected with a signal input end of the controller.
The voltage detector comprises a voltage sensor VT, wherein an A-phase detection end of the voltage sensor VT is connected with an A-phase wiring terminal of the isolating switch QS, a B-phase detection end of the voltage sensor VT is connected with a B-phase wiring terminal of the isolating switch QS, a C-phase detection end of the voltage sensor VT is connected with a C-phase wiring terminal of the isolating switch QS, and a signal output end of the voltage sensor VT is connected with a signal input end of the controller.
The A-phase main contact of the short-circuit contactor KM0 is connected with the current output end of the first current sensor Ha, the B-phase main contact of the short-circuit contactor KM0 is connected with the current output end of the second current sensor Hb, the C-phase main contact of the short-circuit contactor KM0 is connected with the current output end of the third current sensor Hc, and the control signal input end of the short-circuit contactor KM0 is connected with the control signal output end of the controller.
The operation principle of the current detector and the short-circuit contactor KM0 in this embodiment is the same as that in the second embodiment.
The current regulator comprises a first diode D1-a seventh diode D7, a capacitor C and a chopping switch power tube T0, and the brake resistor comprises a first resistor R1.
The drain of the chopping switch power tube T0 is connected with the cathode of the first diode D1, the cathode of the third diode D3 and the cathode of the fifth diode D5 respectively, the gate of the chopping switch power tube T0 is connected with the control signal output end of the controller, the source of the chopping switch power tube T0 is connected with the first end of the first resistor R1, and the second end of the first resistor R1 is connected with the anode of the second diode D2, the anode of the fourth diode D4 and the anode of the sixth diode D6 respectively.
An anode of the first diode D1 and a cathode of the sixth diode D6 are both connected to a current output terminal of the first current sensor Ha, an anode of the third diode D3 and a cathode of the fourth diode D4 are both connected to a current output terminal of the second current sensor Hb, and an anode of the fifth diode D5 and a cathode of the second diode D2 are both connected to a current output terminal of the third current sensor Hc.
The first end of the capacitor C is connected with the drain electrode of the chopping switch power tube T0, and the second end of the capacitor C is connected with the second end of the first resistor R1; the cathode of the seventh diode D7 is connected with the source of the chopping switch power tube T0, and the anode of the seventh diode D7 is connected with the second end of the first resistor R1.
In this embodiment, the capacitor C is a dc filter capacitor C, the seventh diode D7 is a freewheeling diode, and the first diode D1 to the sixth diode D6 form a three-phase rectifier bridge, and the three-phase rectifier bridge converts three-phase ac power into dc power and adjusts the current on the braking resistor by adjusting the duty ratio of the chopper switch power tube T0, thereby achieving stepless adjustment of the electromagnetic braking force.
EXAMPLE five
A full-speed-domain braking device of a permanent magnet synchronous generator fan comprises an isolating switch, a current detector, a voltage detector, a short-circuit contactor, a braking resistor, a current regulator and a controller.
As shown in fig. 5, the input side in the figure is the output voltage of the permanent magnet synchronous generator fan, the current detector includes a first current sensor Ha, a second current sensor Hb and a third current sensor Hc, a current input end of the first current sensor Ha is connected with an a-phase terminal of the isolating switch QS, a current input end of the second current sensor Hb is connected with a B-phase terminal of the isolating switch QS, a current input end of the third current sensor Hc is connected with a C-phase terminal of the isolating switch QS, and signal output ends of the first current sensor Ha, the second current sensor Hb and the third current sensor Hc are all connected with a signal input end of the controller.
The voltage detector comprises a voltage sensor VT, wherein an A-phase detection end of the voltage sensor VT is connected with an A-phase wiring terminal of the isolating switch QS, a B-phase detection end of the voltage sensor VT is connected with a B-phase wiring terminal of the isolating switch QS, a C-phase detection end of the voltage sensor VT is connected with a C-phase wiring terminal of the isolating switch QS, and a signal output end of the voltage sensor VT is connected with a signal input end of the controller.
The A-phase main contact of the short-circuit contactor KM0 is connected with the current output end of the first current sensor Ha, the B-phase main contact of the short-circuit contactor KM0 is connected with the current output end of the second current sensor Hb, the C-phase main contact of the short-circuit contactor KM0 is connected with the current output end of the third current sensor Hc, and the control signal input end of the short-circuit contactor KM0 is connected with the control signal output end of the controller.
The operation principle of the current detector and the short-circuit contactor KM0 in this embodiment is the same as that in the second embodiment.
The current regulator comprises a first switching contactor KM1, a second switching contactor KM2 and a third switching contactor KM3, the brake resistor comprises a first group of resistors, a second resistor and a third group of resistors, the first group of resistors comprises a first A-phase resistor R1, a first B-phase resistor R2 and a first C-phase resistor R3, the second group of resistors comprises a second A-phase resistor R4, a second B-phase resistor R5 and a second C-phase resistor R6, and the third group of resistors comprises a third A-phase resistor R7, a third B-phase resistor R8 and a third C-phase resistor R9.
The first end of the first A-phase resistor R1 is connected with the current output end of the first current sensor Ha through an A-phase switching switch of a first switching contactor KM1, the first end of the first B-phase resistor R2 is connected with the current output end of the second current sensor Hb through a B-phase switching switch of a first switching contactor KM1, the first end of the first C-phase resistor R3 is connected with the current output end of the third current sensor Hc through a C-phase switching switch of a first switching contactor KM1, the second end of the first A-phase resistor R1, the second end of the first B-phase resistor R2 and the second end of the first C-phase resistor R3 are connected to the same connection point, and the control signal input end of the first switching contactor KM1 is connected with the control signal output end of the controller.
The first end of the second A-phase resistor R4 is connected with the current output end of the first current sensor Ha through an A-phase switching switch of a second switching contactor KM2, the first end of the second B-phase resistor R5 is connected with the current output end of the second current sensor Hb through a B-phase switching switch of a second switching contactor KM2, the first end of the second C-phase resistor R6 is connected with the current output end of the third current sensor Hc through a C-phase switching switch of a second switching contactor KM2, the second end of the second A-phase resistor R4, the second end of the second B-phase resistor R5 and the second end of the second C-phase resistor R6 are connected to the same connection point, and the control signal input end of the second switching contactor KM2 is connected with the control signal output end of the controller.
The first end of the third A-phase resistor R4 is connected with the current output end of the first current sensor Ha through an A-phase switching switch of a third switching contactor KM2, the first end of the third B-phase resistor R5 is connected with the current output end of the second current sensor Hb through a B-phase switching switch of a third switching contactor KM2, the first end of the third C-phase resistor R6 is connected with the current output end of the third current sensor Hc through a C-phase switching switch of a third switching contactor KM2, the second end of the second A-phase resistor R4, the second end of the second B-phase resistor R5 and the second end of the second C-phase resistor R6 are connected to the same connection point, and the control signal input end of the second switching contactor KM2 is connected with the control signal output end of the controller.
In this embodiment, the first switching contactor KM1, the second switching contactor KM2, and the third switching contactor KM3 may adjust the current on the brake resistor in a group switching manner, so as to realize the stepped adjustment of the electromagnetic braking force.
It should be noted that, in other embodiments, the current regulator may include more than three switching contactors, and the braking resistor includes more than three groups of resistors, and the specific connection manner is similar.
EXAMPLE six
A full-speed-domain braking device of a permanent magnet synchronous generator fan comprises an isolating switch, a current detector, a voltage detector, a short-circuit contactor, a braking resistor, a current regulator and a controller.
As shown in fig. 6, the input side of the current detector is the output voltage of the permanent magnet synchronous generator fan, the current detector includes a first current sensor Ha, a second current sensor Hb and a third current sensor Hc, a current input end of the first current sensor Ha is connected with an a-phase terminal of the isolating switch QS, a current input end of the second current sensor Hb is connected with a B-phase terminal of the isolating switch QS, a current input end of the third current sensor Hc is connected with a C-phase terminal of the isolating switch QS, and signal output ends of the first current sensor Ha, the second current sensor Hb and the third current sensor Hc are all connected with a signal input end of the controller.
The voltage detector comprises a voltage sensor VT, wherein an A-phase detection end of the voltage sensor VT is connected with an A-phase wiring terminal of the isolating switch QS, a B-phase detection end of the voltage sensor VT is connected with a B-phase wiring terminal of the isolating switch QS, a C-phase detection end of the voltage sensor VT is connected with a C-phase wiring terminal of the isolating switch QS, and a signal output end of the voltage sensor VT is connected with a signal input end of the controller.
The A-phase main contact of the short-circuit contactor KM0 is connected with the current output end of the first current sensor Ha, the B-phase main contact of the short-circuit contactor KM0 is connected with the current output end of the second current sensor Hb, the C-phase main contact of the short-circuit contactor KM0 is connected with the current output end of the third current sensor Hc, and the control signal input end of the short-circuit contactor KM0 is connected with the control signal output end of the controller.
The operation principle of the current detector and the short-circuit contactor KM0 in this embodiment is the same as that in the second embodiment.
The current regulator comprises a first switching contactor KM1, a second switching contactor KM2 and a third switching contactor KM3, the brake resistor comprises a first group of resistors, a second resistor and a third group of resistors, the first group of resistors comprises a first A-phase resistor R1, a first B-phase resistor R2 and a first C-phase resistor R3, the second group of resistors comprises a second A-phase resistor R4, a second B-phase resistor R5 and a second C-phase resistor R6, and the third group of resistors comprises a third A-phase resistor R7, a third B-phase resistor R8 and a third C-phase resistor R9.
The first end of the first A-phase resistor R1 is connected with the current output end of the first current sensor Ha, and the first A-phase resistor R1, the second A-phase resistor R4 and the third A-phase resistor R7 are sequentially connected in series; the first end of the first B-phase resistor R2 is connected with the current output end of the first current sensor Hb, and the first B-phase resistor R2, the second B-phase resistor R5 and the third B-phase resistor R8 are sequentially connected in series; the first end of the first C-phase resistor R3 is connected with the current output end of the first current sensor Hc, and the first C-phase resistor R3, the second C-phase resistor R6 and the third C-phase resistor R9 are sequentially connected in series; the second end of the third a-phase resistor R7, the second end of the third B-phase resistor R8 and the second end of the third C-phase resistor R9 are connected to the same connection point.
The A-phase switching switch of the first switching contactor KM1 is connected with a first A-phase resistor R1 in parallel, the B-phase switching switch of the first switching contactor KM1 is connected with a first B-phase resistor R2 in parallel, the C-phase switching switch of the first switching contactor KM1 is connected with a first C-phase resistor R3 in parallel, and the control signal input end of the first switching contactor KM1 is connected with the control signal output end of the controller. An A-phase switching switch of the second switching contactor KM2 is connected with a second A-phase resistor R4 in parallel, a B-phase switching switch of the second switching contactor KM2 is connected with a second B-phase resistor R5 in parallel, a C-phase switching switch of the second switching contactor KM2 is connected with a second C-phase resistor R6 in parallel, and a control signal input end of the second switching contactor KM2 is connected with a control signal output end of the controller. An A-phase switching switch of the third switching contactor KM3 is connected with a third A-phase resistor R7 in parallel, a B-phase switching switch of the third switching contactor KM3 is connected with a third B-phase resistor R8 in parallel, a C-phase switching switch of the third switching contactor KM3 is connected with a third C-phase resistor R9 in parallel, and a control signal input end of the third switching contactor KM3 is connected with a control signal output end of the controller.
In this embodiment, the first switching contactor KM1, the second switching contactor KM2, and the third switching contactor KM3 may adjust the current on the brake resistor in a group switching manner, so as to realize the stepped adjustment of the electromagnetic braking force.
It should be noted that, in other embodiments, the current regulator may include more than three switching contactors, and the braking resistor includes more than three groups of resistors, and the specific connection manner is similar.
In some embodiments, the permanent magnet synchronous generator fan full speed domain braking device can be a combination of the above embodiments.
It should be noted that the components and the like in the present embodiment may be commercially available products having corresponding functions, and the present embodiment does not involve improvement of the components themselves.
The foregoing is illustrative of the preferred embodiments of the present invention, and it is to be understood that the invention is not limited to the precise forms disclosed herein, and that various other combinations, modifications, and environments may be resorted to, falling within the scope of the invention as defined by the appended claims. But that modifications and variations may be effected by those skilled in the art without departing from the spirit and scope of the invention, which is to be limited only by the claims appended hereto.
Claims (9)
1. A permanent magnet synchronous generator fan full speed domain braking device is characterized by comprising:
the isolating switch is used for disconnecting/connecting the brake part and the current output end of the power generation fan;
the current detector is connected with the isolating switch at a current input end and used for detecting input current and sending a detection result to the controller;
the detection end of the voltage detector is connected with the isolating switch and is used for detecting the input voltage, the voltage frequency and the voltage phase and sending the detection result to the controller;
the main contact of the short-circuit contactor is connected with the current output end of the current detector and is used for short-circuiting the current output of the power generation fan according to a control signal sent by the controller;
the brake resistor is connected with the current output end of the current detector;
the current regulator is used for regulating the current on the brake resistor according to a control signal sent by the controller;
and the controller is used for calculating the rotating speed of the power generation fan according to the voltage frequency and sending out a control signal according to the rotating speed of the power generation fan and/or the received instruction signal.
2. The full-speed-domain brake device for a PMSM (permanent magnet synchronous generator) fan as claimed in claim 1, wherein said current detector comprises:
the current input end of the first current sensor is connected with the A-phase line binding post of the isolating switch, and the signal output end of the first current sensor is connected with the signal input end of the controller and used for detecting A-phase current;
the current input end of the second current sensor is connected with a B-phase line binding post of the isolating switch, and the signal output end of the second current sensor is connected with the signal input end of the controller and used for detecting B-phase current;
and the current input end of the third current sensor is connected with a C-phase wiring terminal of the isolating switch, and the signal output end of the third current sensor is connected with the signal input end of the controller and used for detecting C-phase current.
3. The full-speed-domain braking device for the permanent magnet synchronous generator fan as claimed in claim 2, wherein the a-phase main contact of the short-circuit contactor is connected to the current output terminal of the first current sensor, the B-phase main contact of the short-circuit contactor is connected to the current output terminal of the second current sensor, the C-phase main contact of the short-circuit contactor is connected to the current output terminal of the third current sensor, and the control signal input terminal of the short-circuit contactor is connected to the control signal output terminal of the controller.
4. The full speed range brake device for a PMSM fan of claim 2, wherein said current regulator includes a first triac, a second triac and a third triac, and said braking resistor includes a first resistor, a second resistor and a third resistor;
the first end of the first resistor is connected with the current output end of the first current sensor through a first bidirectional thyristor, and the control electrode of the first bidirectional thyristor is connected with the control signal output end of the controller; the first end of the second resistor is connected with the current output end of the second current sensor through a second bidirectional thyristor, and the control electrode of the second bidirectional thyristor is connected with the control signal output end of the controller; the first end of the third resistor is connected with the current output end of the third current sensor through a third bidirectional thyristor, and the control electrode of the third bidirectional thyristor is connected with the control signal output end of the controller; and the second end of the first resistor, the second end of the second resistor and the second end of the third resistor are connected to the same connection point.
5. The permanent magnet synchronous generator full speed range braking device according to claim 2, wherein the current regulator comprises a first thyristor to a sixth thyristor, and the braking resistor comprises a first resistor;
the first end of the first resistor is respectively connected with the cathode of the first thyristor, the cathode of the third thyristor and the cathode of the fifth thyristor, and the second end of the first resistor is respectively connected with the anode of the second thyristor, the anode of the fourth thyristor and the anode of the sixth thyristor;
the anode of the first thyristor and the cathode of the sixth thyristor are both connected with the current output end of the first current sensor, the anode of the third thyristor and the cathode of the fourth thyristor are both connected with the current output end of the second current sensor, and the anode of the fifth thyristor and the cathode of the second thyristor are both connected with the current output end of the third current sensor;
and control electrodes of the first thyristor to the sixth thyristor are all connected with a control signal output end of the controller.
6. The full-speed-domain brake device for the PMSM fan according to claim 2, wherein said current regulator comprises a first diode to a seventh diode, a capacitor and a chopper switch power tube, and said brake resistor comprises a first resistor;
the drain electrode of the chopping switch power tube is respectively connected with the cathode of the first diode, the cathode of the third diode and the cathode of the fifth diode, the grid electrode of the chopping switch power tube is connected with the control signal output end of the controller, the source electrode of the chopping switch power tube is connected with the first end of the first resistor, and the second end of the first resistor is respectively connected with the anode of the second diode, the anode of the fourth diode and the anode of the sixth diode;
the anode of the first diode and the cathode of the sixth diode are both connected with the current output end of the first current sensor, the anode of the third diode and the cathode of the fourth diode are both connected with the current output end of the second current sensor, and the anode of the fifth diode and the cathode of the second diode are both connected with the current output end of the third current sensor;
the first end of the capacitor is connected with the drain electrode of the chopping switch power tube, and the second end of the capacitor is connected with the second end of the first resistor;
and the cathode of the seventh diode is connected with the source electrode of the chopping switch power tube, and the anode of the seventh diode is connected with the second end of the first resistor.
7. The full-speed-domain braking device of the permanent magnet synchronous power generation fan according to claim 2, wherein the current regulator comprises N switching contactors, the braking resistor comprises N groups of resistors, N is larger than or equal to 3, and the N switching contactors are in one-to-one correspondence with the N groups of resistors;
each group of resistors comprises an A-phase resistor, a B-phase resistor and a C-phase resistor, the first end of the A-phase resistor is connected with the current output end of the first current sensor through an A-phase switching switch of the corresponding switching contactor, the first end of the B-phase resistor is connected with the current output end of the second current sensor through a B-phase switching switch of the corresponding switching contactor, the first end of the C-phase resistor is connected with the current output end of the third current sensor through a C-phase switching switch of the corresponding switching contactor, the second end of the A-phase resistor, the second end of the B-phase resistor and the second end of the C-phase resistor are connected to the same connection point, and the control signal input end of the switching contactor is connected with the control signal output end of the controller.
8. The full-speed-domain braking device of the permanent magnet synchronous power generation fan according to claim 2, wherein the current regulator comprises N switching contactors, the braking resistor comprises N groups of resistors, N is not less than 3, the N switching contactors are in one-to-one correspondence with the N groups of resistors, and control signal input ends of the switching contactors are connected with control signal output ends of the controller;
each group of resistors comprises an A-phase resistor, a B-phase resistor and a C-phase resistor, wherein the A-phase resistor is connected with an A-phase switching-in switch of the corresponding switching contactor in parallel, the B-phase resistor is connected with a B-phase switching-in switch of the corresponding switching contactor in parallel, and the C-phase resistor is connected with a C-phase switching-in switch of the corresponding switching contactor in parallel;
the second end of the A-phase resistor, the second end of the B-phase resistor and the second end of the C-phase resistor of the Nth group of resistors are connected to the same connection point;
the first end of the A-phase resistor of the first group of resistors is connected with the current output end of the first current sensor, and the A-phase resistor of the first group of resistors is connected with the A-phase resistor of the Nth group of resistors in series in sequence; the first end of the B-phase resistor of the first group of resistors is connected with the current output end of the first current sensor, and the B-phase resistor of the first group of resistors is connected with the B-phase resistor of the Nth group of resistors in series in sequence; the first end of the C-phase resistor of the first group of resistors is connected with the current output end of the first current sensor, and the C-phase resistor of the first group of resistors is connected with the C-phase resistor of the Nth group of resistors in series in sequence.
9. The full-speed-domain braking device for the PMSM fan according to claim 1, wherein the voltage detector is a voltage sensor, an A-phase detection end of the voltage sensor is connected with an A-phase wiring terminal of the isolating switch, a B-phase detection end of the voltage sensor is connected with a B-phase wiring terminal of the isolating switch, a C-phase detection end of the voltage sensor is connected with a C-phase wiring terminal of the isolating switch, and a signal output end of the voltage sensor is connected with a signal input end of the controller.
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| WO2024026069A1 (en) * | 2022-07-28 | 2024-02-01 | Sapphire Technologies, Inc. | Turboexpander system with low voltage ride through control architecture |
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| WO2024026069A1 (en) * | 2022-07-28 | 2024-02-01 | Sapphire Technologies, Inc. | Turboexpander system with low voltage ride through control architecture |
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Denomination of utility model: A full speed range braking device for permanent magnet synchronous generator fan Effective date of registration: 20210714 Granted publication date: 20200825 Pledgee: Chengdu SME financing Company Limited by Guarantee Pledgor: Chengdu Site Electric Technology Co.,Ltd. Registration number: Y2021980006180 |