CN201018445Y - Overlapping dual-rotor motor and variable speed and variable frequency excitation system of the wind generating set - Google Patents
Overlapping dual-rotor motor and variable speed and variable frequency excitation system of the wind generating set Download PDFInfo
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- CN201018445Y CN201018445Y CNU2006201517764U CN200620151776U CN201018445Y CN 201018445 Y CN201018445 Y CN 201018445Y CN U2006201517764 U CNU2006201517764 U CN U2006201517764U CN 200620151776 U CN200620151776 U CN 200620151776U CN 201018445 Y CN201018445 Y CN 201018445Y
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Abstract
The utility model relates to a telescopic double-rotor motor and a variable-speed variable-frequency excitation system for a wind generator set; wherein a counter drive shaft of the generator is provided with a rotary permanent-magnet inner rotor relative to a stator, a main drive shaft of the generator is provided with a rotary ring-shaped rotor relative to the stator, an auxiliary wind wheel is upwind rotatable arranged in accordance with the F2 direction, a main wind wheel is arranged on the main drive shaft through a downwind rotatable drive structure, and a brake for braking the auxiliary wind wheel is arranged between a generator end cover and an auxiliary wind wheel hub. The main and auxiliary wind wheels are provided with a main wind wheel rotary speed measuring device and an auxiliary wind wheel rotary speed measuring device which can transfer the signal of the rotary speed into a generator set central control device; a yawer is connected with the generator set central control device through the mode of controlling the main wind wheel to downwind rotate. The scheme not only can realize the operation of the variable-speed variable-frequency excitation system for the wind generator set, but also can effectively shorten the diameter of the generator.
Description
Technical Field
The utility model relates to a aerogenerator, especially have variable speed variable frequency generator of telescopiform birotor excitation structure and excitation control system thereof.
Background
The prior art discloses a variable speed constant frequency method of wind power generation as in chinese patent CN200510022771.1, which is characterized in that the rotating speed of the rotor of the wind turbine is increased by the speed increasing gear box, then the input power Pw generated by variable speed is input to the input shaft of the differential permanent magnet motor, the differential mechanism of the differential permanent magnet motor performs power splitting or converging to generate power flow Pg, which enters the stator winding of the differential permanent magnet motor to realize constant speed constant frequency power generation to the power grid through the feeder line. Compare with traditional variable speed constant frequency method, the utility model discloses when reducing the power generating equipment cost, still can show the generating efficiency who improves power generation system.
For another example, chinese patent CN200410009701.8 discloses a variable speed constant frequency wind power generation system using a doubly-fed induction motor as a generator and a grid-connected control method thereof. The device comprises a double-fed induction motor, an excitation converter, a DSP unit, an electric quantity acquisition unit, a speed and position measurement unit and a driving unit. The excitation converter is controlled, the doubly-fed generator stator is made to generate voltage by using the excitation converter, the phase, the amplitude and the frequency of the motor stator voltage are controlled simultaneously, and the voltage of a power grid and the voltage of the motor stator do not need to be synchronized independently; when the speed range of the motor is 0-0.5 s, the driving unit starts to drive the excitation converter, so that the speed range of the rotating speed of the motor for grid connection is wide, the requirement of grid connection control on the speed is not strict, and meanwhile, the control process adopts current open-loop control, so that the system is simplified, the burden of a system processor is reduced, the current control is simple and easy to implement, and the double-fed motor is easy to grid connection.
Chinese patent application 99127259.5 discloses the utility model relates to a high efficiency wind energy utilization method and full rotor double wind wheel wind power generator and teaching aid toy full rotor double wind wheel wind power generator. The method comprises the following steps: when wind blows the first wind wheel to rotate, the second wind wheel is pushed to rotate by the wind behind the wind wheel and the air flow generated by the rotation of the wind wheel, the wind wheel drives the shaft rod to rotate rightwards, and the wind wheel drives the shaft tube to rotate leftwards to do mechanical work. The wind wheels of the full-rotor double-wind-wheel wind driven generator drive the magnetic pole rotors on the shaft rods to rotate rightwards under the support of the bearings, the wind wheels drive the power generation rotors on the shaft tubes to rotate leftwards under the support of the bearings, and the coils cut magnetic lines of force to generate current.
The conventional wind generating set transmits the power generated by the wind wheel under the action of wind power to the generator through a gear box and enables the generator to obtain corresponding rotating speed; the rotating speed of the wind wheel is usually very low and can not reach the generating rotating speed required by the high-speed generator, and the wind wheel is realized by the speed increasing action of a gear pair of a gear box; the working condition environment of the wind driven generator set is generally poor, and frequent failure of the gear box is a common occurrence.
The product manufactured by the prior art has poor reliability, high maintenance cost and low unit efficiency. The industry hopes to utilize the brushless structure and the wider variable speed variable frequency operation range of the brushless double-fed motor technology, combine the technical advantages of the high-efficient wind energy utilization of the double-turbine that is installed on the transmission shaft of the double-rotor and rotates in opposite directions, and remove the gear box and the complex control system to realize the variable speed variable frequency operation of the generator set.
Disclosure of Invention
The utility model aims to solve the problem that the above-mentioned defect that the technique exists is overcome to overcome, and a telescopiform birotor generator and variable speed frequency conversion excitation system thereof is provided.
One of the objectives of the present invention is to provide a nested dual rotor motor;
another object of the present invention is to provide a variable speed and variable frequency excitation control system.
The utility model solves the technical problem of the nested double-rotor motor by adopting the following technical proposal, and according to the nested double-rotor motor provided by the utility model, the nested double-rotor motor comprises a generator main body, wherein, the permanent magnet inner rotor of the generator is arranged in the shell of the generator main body through the transmission of an auxiliary transmission shaft and a structure device which is in relative stator rotation; the auxiliary transmission shaft driven by the auxiliary wind wheel and the main transmission shaft driven by the main wind wheel are coaxially arranged in a mutual rotating connection mode, and the auxiliary wind wheel is arranged at the end part of the shaft body of the auxiliary transmission shaft in a transmission structure device which rotates opposite to the main wind wheel in a wind direction; the annular rotor of the generator is driven by the main drive shaft; the annular rotor is a structural device which surrounds and can rotate around the permanent magnet inner rotor, and the annular rotor is configured in a structure rotating relative to the stator.
In the nested dual-rotor motor, the auxiliary wind wheel is rotatably mounted in an upward wind direction according to the direction F2; the main wind wheel is assembled on the main transmission shaft in a transmission structure rotating in a downwind direction; the brake for the auxiliary wind wheel brake is arranged between the generator end cover and the auxiliary wind wheel hub.
The nested dual-rotor motor is characterized in that the annular rotor consists of an annular rotor core surrounding the permanent magnet inner rotor, an annular rotor inner side winding and an annular rotor outer side winding, wherein the annular rotor inner side winding and the annular rotor outer side winding are matched and combined with the annular rotor core; the main transmission shaft and the auxiliary transmission shaft are both provided with hollow through holes with preset diameters.
In the nested dual-rotor motor, one end of the main transmission shaft extends out of the casing through the second bearing support arranged at the second end cover part of the generator and is assembled with the main wind wheel, and the other end of the main transmission shaft extends into the casing and is configured with the annular rotor in a power transmission structure through the annular rotor support unit; the auxiliary transmission shaft is supported by a first bearing arranged on the first end cover part of the generator and extends out of the auxiliary wind wheel of the shell device.
In the nested dual-rotor motor, a bearing part for rotating the annular rotor along with the main transmission shaft is arranged at a position where the annular rotor supporting unit is combined with the transmission shaft; the annular rotor surrounds the permanent magnet inner rotor device on the main transmission shaft by annular rotor supporting units respectively arranged at two ends of the annular rotor.
The utility model provides a technical problem that the variable speed variable frequency excitation control system is realized to adopt following technical scheme, according to the utility model provides a wind turbine generator system variable speed variable frequency excitation system, including the generator, wherein, the auxiliary transmission shaft of generator is last to dispose by the rotatory permanent magnetism inner rotor of the relative stator of this auxiliary transmission shaft transmission; the main transmission shaft of the generator is provided with an annular rotor which is driven by the main transmission shaft and rotates relative to the stator; the annular rotor is also arranged in a structure surrounding the permanent magnet inner rotor and can rotate around the permanent magnet inner rotor; the pole pair number of the inner side winding of the annular rotor is consistent with the pole pair number of the inner permanent magnet rotor and is set as Pe opposite poles; the pole pair number of the outer side winding of the annular rotor is consistent with the pole pair number of the stator winding and is set as Pg opposite poles, and the outer side winding of the annular rotor is connected with the inner side winding of the annular rotor through a connecting wire between the windings of the annular rotor in an inverted phase sequence; the main wind wheel and the auxiliary wind wheel are provided with a main wind wheel rotating speed measuring device and an auxiliary wind wheel rotating speed measuring device which can transmit rotating speed signals to the unit centralized control device, and the unit centralized control device is also provided with a port connected with the wind speed detecting device, a port connected with the wind direction detecting device and a port for transmitting data with an upper computer; the yaw controller is connected with the unit centralized control device in a mode of controlling the main wind wheel to rotate in the downwind direction;
the main wind wheel and the auxiliary wind wheel are respectively provided with a main wind wheel variable pitch adjusting mechanism and an auxiliary wind wheel variable pitch adjusting mechanism for adjusting the pitch angle, and the main wind wheel variable pitch adjusting mechanism and the auxiliary wind wheel variable pitch adjusting mechanism are connected with the unit centralized control device in a mode of controlling the variable pitch of the wind wheel variable pitch adjusting mechanism; the voltage output end of the generator is sequentially connected with a grid-connected frequency converter and a boosting transformer and then is connected with an external power grid; a voltage detection device connected with the unit centralized control device and an output current detection device connected with the unit centralized control device are sequentially arranged between the grid-connected frequency converter and the step-up transformer; and a no-load detection device connected with the unit centralized control device is arranged between the generator and the grid-connected frequency converter.
The utility model provides a variable speed frequency conversion excitation control system technical problem can also take following technical scheme to further realize:
in the variable-speed variable-frequency excitation system of the wind turbine generator, the pitch adjusting mechanisms of the main wind wheel and the auxiliary wind wheel have the same structure, and comprise a pitch servo mechanism and a pitch control device, and the unit centralized control device is connected with the pitch servo mechanism through the pitch control device; an auxiliary wind wheel pitch angle measuring device and a main wind wheel pitch angle measuring device are respectively arranged in the main wind wheel and the auxiliary wind wheel; the blade wind-sweeping area of the main wind wheel is 2-5 times larger than that of the auxiliary wind wheel; and the pole pair number Pg of the outer side winding of the annular rotor is set to be larger than the pole pair number Pe of the inner side winding of the annular rotor.
In the variable-speed variable-frequency excitation system of the wind turbine generator, the main and auxiliary wind wheel variable-pitch adjusting mechanisms are driven by a servo motor; the variable-pitch servo mechanism is electrically connected with the unit centralized control device in a mode of adjusting the rotating speed of the main wind wheel and the auxiliary wind wheel according to the change of the pitch angle; the wind sweeping area of the main wind wheel blade is about 3 times of that of the auxiliary wind wheel blade.
In the variable-speed variable-frequency excitation system of the wind turbine, the main wind wheel is arranged in a downwind counter-wind rotating structure, the auxiliary wind wheel is arranged in an upwind reverse counter-wind rotating structure, and the brake is arranged between the end cover of the generator and the hub of the auxiliary wind wheel; the number of pole pairs of the outer side winding of the annular rotor can be 3 times that of the inner side winding of the annular rotor.
In the variable-speed variable-frequency excitation system of the wind turbine generator, a main wind wheel of the generator is configured on the main transmission shaft, and rotates at a speed of Nzr relative to the stator having the Pg pole pair number under the action of wind power, and the rotating speed of the main wind wheel satisfies the following relational expression:
wherein: nzr represents the main wind wheel speed; pg represents the number of pole pairs of the stator winding; pe represents the pole pair number of the permanent magnet inner rotor; fg denotes the stator frequency; fe represents the reduced frequency of the permanent magnet inner rotor;
the auxiliary wind wheel of the generator is arranged on the auxiliary transmission shaft, the auxiliary wind wheel drives the permanent magnet inner rotor to rotate reversely relative to the main wind wheel at the Ne speed, and the converted frequency of the permanent magnet inner rotor satisfies the following relational expression:
the auxiliary transmission shaft is provided with a permanent magnet inner rotor which rotates relatively at the Nzre rotating speed and has Pe pole pairs, and the rotating speed of the permanent magnet inner rotor relative to the annular rotor meets the following relational expression: nzre = Nzr + Ne
Wherein: nzre represents the rotational speed at which the permanent magnet inner rotor rotates relative to the annular rotor.
Compared with the prior art, the utility model has apparent advantage and beneficial effect. According to the above technical scheme, the utility model discloses under excellent structural configuration, at least following advantage:
the scheme adopts a generator with double wind wheel mechanisms, wherein a main wind wheel with a larger diameter is used for generating electricity, an auxiliary wind wheel with a smaller diameter is used for adjusting the excitation frequency and generating electricity, the main wind wheel and the auxiliary wind wheel rotate in opposite directions on the same axis, and a yaw controller is responsible for controlling the main wind wheel to rotate in the downwind direction and generate electricity by main force; the wind direction on the auxiliary wind wheel rotates in the opposite direction to wind, so that power generation is assisted, and the efficiency is greatly improved; the double-wind-wheel structure and the configuration of the yaw mechanism enable the yaw control of the unit to be simpler and more reliable; the scheme adopts a dual-rotor telescoping structure of a brushless double-fed motor rotor and a rotating permanent magnet inner rotor to realize the variable-speed variable-frequency excitation operation of the unit, and the number of pole pairs of a single-rotor generator with the same capacity is reduced by at least 1/3, so that the diameter of the generator is shortened, the transportation is convenient, and the weight of the unit is reduced; the double-wind-wheel generator set can realize variable-speed variable-frequency operation and variable-pitch adjustment, the wind energy utilization rate of the double-wind-wheel generator set is greatly improved compared with that of a single-wind-wheel variable-speed variable-frequency generator set below rated wind speed, direct drive can be realized without a gear box, no slip ring fault is caused, and the reliability of the generator set is greatly improved; compared with the prior art, the utility model has obvious contribution and progress, and is a good technology with novelty, creativity and practicability.
The detailed description of the present invention is given by the following examples and the accompanying drawings.
Drawings
FIG. 1 is a schematic structural view of the telescopic dual-rotor variable-speed variable-frequency generator of the present invention;
fig. 2 is a schematic diagram of the wiring structure of the excitation winding of the present invention;
fig. 3 is a schematic structural diagram of the variable speed and variable frequency excitation control system of the present invention;
fig. 4 is the working principle block diagram of the variable speed and variable frequency excitation control system of the utility model.
Detailed Description
The following detailed description is provided for the specific embodiments, structures, features and functions of the present invention in connection with the accompanying drawings and preferred embodiments.
As shown in fig. 1-4, a telescopic dual-rotor variable-speed variable-frequency generator comprises a generator main body 1 fixedly arranged on a base 10, a generator stator 16 fixedly arranged in a generator main body casing 11, wherein,
the permanent magnet inner rotor 17 is driven by the auxiliary drive 12 shaft and is arranged in the generator main body shell in a structure rotating relative to the stator 16;
an annular rotor 14 is driven by a main transmission shaft 13, the annular rotor is a structural device which surrounds and can rotate around the permanent magnet inner rotor, and the annular rotor 14 is configured to rotate relative to a stator 16; the annular rotor 14 surrounds the permanent magnet inner rotor 17 by an annular rotor supporting unit 140 and is arranged on the main transmission shaft 13; the generator stator 16 is matched with the annular rotor 14, and a stator winding 161 which outputs electric energy outwards is arranged on a stator core 162 which is fixedly arranged in a motor shell;
the annular rotor 14 is composed of an annular rotor core 141 surrounding the permanent magnet inner rotor, an annular rotor inner side winding 142 and an annular rotor outer side winding 143, the annular rotor inner side winding and the annular rotor outer side winding are matched and combined with the annular rotor core, annular rotor supporting units 140 are respectively arranged at two ends of the annular rotor, and a bearing member 1401 is arranged at the position where the annular rotor supporting units are combined with the transmission shaft, so that the annular rotor rotates along with the main transmission shaft;
the annular rotor is used as a brushless double-fed motor rotor and forms a telescopic double-rotor structure of the generator with the permanent magnet inner rotor which is driven to rotate by the auxiliary transmission shaft; therefore, the variable-speed variable-frequency operation of the unit can be realized, and the number of pole pairs of a single-rotor generator with the same capacity is reduced by at least 1/3, so that the diameter of the generator can be greatly shortened, the transportation of equipment is facilitated, and the weight of the motor is reduced;
the auxiliary wind wheel 2 is assembled at the extending end 121 of the auxiliary transmission shaft through the hub 21 of the auxiliary wind wheel according to the transmission structure that the wind direction is opposite to the main wind wheel in the prior art; a brake 15 for braking the auxiliary wind wheel is arranged between the generator end cover and the auxiliary wind wheel hub;
the auxiliary transmission shaft is supported by a first bearing 115 arranged at the first end cover 111 of the generator and extends out of the shell 11 to be provided with an auxiliary wind wheel, a transmission structure that the auxiliary wind wheel 2 rotates opposite to the main wind wheel is arranged at the end part of the shaft body of the auxiliary transmission shaft 12, and the auxiliary wind wheel is rotatably arranged in the upward wind direction according to the F2 direction through a wheel hub 21 of the auxiliary wind wheel in the prior art;
through the conventional technology, a secondary transmission shaft 12 driven by a secondary wind wheel and a main transmission shaft 13 driven by a main wind wheel are coaxially installed in a mutual rotating connection mode, and the power of the secondary wind wheel is transmitted to a permanent magnet inner rotor through the secondary transmission shaft; the main transmission shaft and the auxiliary transmission shaft are provided with hollow through holes 120 and 130 with preset diameters, so that the transmission shaft of the large-scale generator set is lighter under the condition of meeting the technical requirements, and the weight of the machine body is reduced;
one end of the main transmission shaft is supported by a second bearing 116 arranged at the second end cover 112 of the generator to extend out of the machine shell and be assembled with a main wind wheel, the main wind wheel 3 is assembled on the main transmission shaft 13 through a transmission structure that a wheel hub 31 rotates in a downwind direction, and the other end of the main transmission shaft extends into the machine shell and is arranged with a ring rotor in a power transmission structure according to the prior art through a ring rotor supporting unit 140; the main wind wheel is installed by the wheel hub 31 in the direction of F3 and the wind direction is downward wind;
a variable-speed variable-frequency excitation system comprises the generator M, wherein a main wind wheel 3 of the generator is arranged on a main transmission shaft, rotates relative to a stator 16 with Pg pole pairs at a speed of Nzr under the action of wind power, and the rotating speed of the main wind wheel meets the following relational expression:
wherein: nzr for main wind wheel speed; pg represents the number of pole pairs of the stator winding; pe represents the pole pair number of the permanent magnet inner rotor; fg denotes the stator frequency; fe represents the reduced frequency of the permanent magnet inner rotor;
the pole pair number of the winding at the inner side of the annular rotor is consistent with the pole pair number of the permanent magnet inner rotor and is set as a Pe opposite pole; the pole pair number of the winding outside the annular rotor is consistent with the pole pair number of the stator winding and is set as Pg opposite poles; the outer winding and the inner winding of the annular rotor are connected in an inverted phase sequence through an annular rotor inter-winding connecting wire 123; the number Pg of the pole pairs of the windings on the outer side of the annular rotor is set to be larger than the number Pe of the pole pairs of the windings on the inner side of the annular rotor, and the number Pg of the windings on the outer side of the annular rotor can be 3 times of the number Pe of the windings on the inner side of the annular rotor;
the auxiliary wind wheel 2 of the generator is arranged on an auxiliary transmission shaft, the auxiliary wind wheel drives the permanent magnet inner rotor to rotate reversely relative to the main wind wheel at the Ne speed, and the converted frequency of the permanent magnet inner rotor satisfies the following relational expression:
Wherein: nzre represents the rotational speed of the permanent magnet inner rotor relative to the annular rotor;
the main wind wheel and the auxiliary wind wheel are provided with a main wind wheel rotating speed measuring device G and an auxiliary wind wheel rotating speed measuring device G1 which can transmit rotating speed signals to the unit centralized control device 5, and wind speed measured by a port D1 connected with the wind speed detecting device and wind wheel rotating speed measured by the rotating speed measuring device are transmitted to the unit centralized control device 5; the unit centralized control device is connected with a yaw controller 6 to control the main wind wheel to rotate in the downwind direction and the windward direction, and the yaw controller 6 can be arranged in an engine room inside 101 under the base;
the hub parts of the main wind wheel and the auxiliary wind wheel are respectively provided with a main wind wheel variable pitch adjusting mechanism 38 and an auxiliary wind wheel variable pitch adjusting mechanism 28 for adjusting the pitch angle, the main wind wheel and the auxiliary wind wheel variable pitch adjusting mechanism are electrically connected with the unit centralized control device 5, and the unit centralized control device 5 sends a pitch instruction to the main wind wheel variable pitch adjusting mechanism 38; an auxiliary wind wheel pitch angle measuring device G28 and a main wind wheel pitch angle measuring device G38 are respectively arranged in the main wind wheel and the auxiliary wind wheel;
the main and auxiliary wind wheel pitch regulation mechanisms have the same structure and consist of pitch control servomechanisms 381 and 281 driven by servo motors M38 and M28 and pitch control devices 382 and 282, and the unit integrated control 5 is connected with the pitch control servomechanisms 381 and 281 driven by the servo motors M38 and M28 through the pitch control devices 382 and 282; the variable-pitch servo mechanism adjusts the rotating speed of the main wind wheel and the auxiliary wind wheel according to the detected change of the pitch angle under the control of the unit centralized control device 5, so that the downwind direction of the main wind wheel rotates towards the wind, and the upwind direction of the auxiliary wind wheel rotates towards the wind in a reverse direction; the brake 15 is arranged between the generator end cover and the auxiliary wind wheel hub;
the voltage output end of the generator is sequentially connected with a grid-connected frequency converter 7 and a booster transformer 8 and then connected with an external power grid W; a voltage measuring device G4 connected with the unit centralized control device 5 and an output current detecting device G3 connected with the unit centralized control device are sequentially arranged between the grid-connected frequency converter and the step-up transformer; a no-load detection device G5 connected with a unit centralized control device is arranged between the generator M and the grid-connected frequency converter; the unit centralized control device is also provided with a port D1 connected with a wind speed detection device (not shown), a port D2 connected with a wind direction detection device (not shown) and a port D3 for transmitting data with an upper computer; the main wind wheel blade and the auxiliary wind wheel blade are arranged on a wind wheel hub according to a known technical mode, the wind sweeping area of the main wind wheel blade is 2-5 times larger than that of the auxiliary wind wheel blade, particularly the wind sweeping area of the main wind wheel blade is preferably about 3 times larger than that of the auxiliary wind wheel blade, and the wind sweeping area is the area formed by the rotation of the wind wheel;
in summary, the wind motor with double wind wheel mechanisms is characterized in that a main wind wheel with a larger diameter is used for generating electricity, an auxiliary wind wheel with a smaller diameter is used for adjusting the excitation frequency and generating electricity, the main wind wheel and the auxiliary wind wheel rotate on the same axis in opposite directions, and a yaw controller is used for controlling the main wind wheel to rotate in the downwind direction to the wind and generate electricity by main force; the auxiliary wind wheel rotates in the opposite direction to wind to assist in generating electricity, and the efficiency is greatly improved.
The voltage output end of the generator is provided with a grid-connected frequency converter and the like, so that the output voltage of the generator can be regulated, and the generator can be subjected to soft grid connection after the same period and soft splitting during shutdown, the impact of grid-connected reactive current can be effectively reduced, and the safe operation of a unit can be ensured; when the generator reaches rated output power, the power factor of the unit is controlled to operate around cos theta = 1; when the active power output by the generator is smaller, the unit outputs inductive reactive power with cos theta less than 1; and when the rotating speed of the generator is lower than the rated minimum rotating speed or the output power of the generator is higher than the maximum output power, the generator is disconnected from the power grid, and soft disconnection is completed through the configuration of a grid-connected frequency converter and the like.
The variable speed variable frequency excitation control method comprises the following steps:
1) A main wind wheel which rotates at the speed of Nzr relative to the stator with the Pg pole pair number under the action of wind power is configured on the main transmission shaft, and the rotating speed of the main wind wheel satisfies the following relational expression:
wherein: nzr represents the main wind wheel speed; pg represents the number of pole pairs of the outer side winding of the annular rotor; pe represents the pole pair number of the permanent magnet inner rotor; fg represents the stator frequency; fe represents the reduced frequency of the permanent magnet inner rotor;
2) The auxiliary wind wheel arranged at the end part of the auxiliary transmission shaft 12 drives the permanent magnet inner rotor to rotate reversely relative to the main wind wheel at the speed of Ne, and the converted frequency of the permanent magnet inner rotor meets the following relational expression:
wherein: ne represents the relative stator rotation speed of the sub-wind wheel
3) A permanent magnet inner rotor which rotates relatively at the Nzre rotating speed and has Pe pole pairs is configured on the auxiliary transmission shaft, and the rotating speed of the permanent magnet inner rotor relative to the excitation inner rotor satisfies the following relational expression:
nzre = Nzr + Ne wherein: nzre represents the rotational speed of the permanent magnet inner rotor relative to the annular rotor;
4) The pole pair number of the winding at the inner side of the annular rotor is consistent with the pole pair number of the permanent magnet inner rotor and is set as a Pe pole pair; the pole pair number of the winding outside the annular rotor is consistent with the pole pair number of the stator winding and is set as Pg opposite poles; the outer winding and the inner winding of the annular rotor are connected in an inverted phase sequence through a connecting wire 123 between the annular rotor windings;
5) When the main wind wheel is lower than the rated rotating speed, the unit centralized control device performs tip speed ratio control on the main wind wheel, the wind speed measured by a port D1 connected with a wind speed detection device and the rotating speed of the main wind wheel measured by a rotating speed measurement device G are transmitted to the unit centralized control device 5, the adjustment value of the pitch angle is calculated by comparing the value with the tip speed ratio value of the main wind wheel preset by the unit centralized control device, then the adjustment value is compared with the pitch angle value collected by a main wind wheel pitch angle measurement device G38, and a pitch control command is sent to a main wind wheel pitch control mechanism 38 by the unit centralized control device 5;
is controlled by a unit centralized control device 5
Carrying out speed change control on the main wind wheel and the auxiliary wind wheel by the relational expression; therefore, the main wind wheel can run at the optimal tip speed ratio below the rated rotating speed, and the aim of fully utilizing wind energy is fulfilled;
when the main wind wheel reaches the rated rotating speed, the unit centralized control device controls the power of the generator; the output current of the generator measured by the output current detection device G3 and the output voltage of the generator measured by the output voltage measurement device G4 are transmitted to the unit centralized control device 5, and the output power value of the generator calculated by the unit centralized control device is compared with a preset rated power value; when the preset value is met, the unit centralized control device calculates the acquired wind speed measured by the port D1 connected with the wind speed detection device and the rated rotating speed of the main wind wheel measured by the rotating speed measurement device G, the adjusting value of the pitch angle of the rated rotating speed of the main wind wheel at the wind speed is compared with the pitch angle value acquired by the main wind wheel pitch angle measurement device G38, and the unit centralized control device 5 sends a pitch instruction to the main wind wheel pitch-changing adjusting mechanism 38; therefore, the main wind wheel can run under constant power, and the generator is prevented from being overloaded;
6) When the auxiliary wind wheel is lower than the rated rotating speed, the unit centralized control device performs tip speed ratio control on the auxiliary wind wheel, and the wind speed measured by a port D1 connected with the wind speed detection device and the rotating speed of the auxiliary wind wheel measured by an auxiliary wind wheel rotating speed measurement device G1 are transmitted to a unit centralized control device 5; the blade tip speed ratio value of the auxiliary wind wheel preset by the unit centralized control device is compared, the adjusting value of the pitch angle is calculated, then the adjusting value is compared with the pitch angle value collected by the auxiliary wind wheel pitch angle measuring device G28, and the unit centralized control device sends a pitch changing instruction to the auxiliary wind wheel pitch changing adjusting mechanism 28; therefore, the secondary wind wheel can run at the optimal tip speed ratio below the rated rotating speed, and the aim of fully utilizing wind energy is fulfilled;
when the auxiliary wind wheel reaches the rated rotating speed, the unit centralized control device controls the power of the generator; the output current of the generator measured by the output current detection device G3 and the output voltage of the generator measured by the output voltage measurement device G4 are transmitted to the unit centralized control device 5, and the output power value of the generator calculated by the unit centralized control device 5 is compared with a preset rated power value; when the preset value is met, the unit centralized control device 5 calculates the acquired wind speed measured by the port D1 connected with the wind speed detection device and the rated rotating speed of the auxiliary wind wheel measured by the rotating speed measurement device G, calculates the adjusting value of the pitch angle of the rated rotating speed of the auxiliary wind wheel at the wind speed, compares the adjusting value with the pitch angle value acquired by the auxiliary wind wheel pitch angle measurement device G28, and sends a pitch-changing instruction to the auxiliary wind wheel pitch-changing adjusting mechanism 28 by the unit centralized control device 5; therefore, the main wind wheel can run under constant power, and the generator is prevented from being overloaded; when the output voltage frequency of the generator is less than or equal to the rated rotating speed, the generator keeps the variable-speed variable-frequency operation within the range of 5Hz-50Hz, particularly the output voltage frequency of the generator is the best within the range of 10Hz-20H, and the generator is always in grid-connected operation at the output voltage frequency of 50Hz through rectification and inversion of a grid-connected frequency converter 7, so that the variable-speed variable-frequency operation of the wind turbine generator is indirectly realized;
7. the number Pg of the pole pairs of the windings on the outer side of the annular rotor is set to be greater than the number Pe of the pole pairs of the windings on the inner side of the annular rotor, and the number Pg of the windings on the outer side of the annular rotor can be 3 times of the number Pe of the windings on the inner side of the annular rotor;
therefore, when the synchronous generator works, the two nested rotor windings have the same current frequency and the rotating magnetic fields in opposite directions, the rotating speed Nzre of the generator rotor winding relative to the nested rotor is superposed and matched with the mechanical rotating speed Nzr of the main wind wheel shaft, a synchronous excitation magnetic field is always formed, and the synchronous magnetic field generates 50Hz electric potential in the stator winding with the Pg opposite poles, so that the variable-speed constant-frequency excitation operation of the generator set is realized.
8) The primary rotor mounted on the transmission shaft 13 and the secondary rotor 2 mounted on the secondary transmission shaft are in a relative counter-rotating configuration by means of a relative counter-adjustment of the blade pitch angle. The reverse rotation wake flow energy behind the auxiliary wind wheel is fully utilized, and the wind energy utilization rate is improved by 15-25% compared with that of a single wind turbine set with the same capacity.
9) When the series permanent magnet variable-speed variable-frequency excitation dual-rotor wind motor runs in a grid-connected mode and the rotating speed of the main wind wheel is between the preset rated rotating speed and the lowest rotating speed, the auxiliary wind wheel reversely rotates in a wind direction under the regulation of the unit centralized control device 5 according to the preset condition.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the present invention in any way, and all simple modifications, equivalent variations and modifications made to the above embodiment according to the technical spirit of the present invention are within the scope of the technical solution of the present invention.
Claims (10)
1. A nested dual rotor electric machine comprising a generator body (1), characterised in that a permanent magnet inner rotor (17) of the generator is driven by a secondary drive shaft (12) and arranged in a generator body housing in a configuration rotating relative to a stator (16); the auxiliary transmission shaft driven by the auxiliary wind wheel and the main transmission shaft driven by the main wind wheel are coaxially arranged in a mutual rotating connection mode, and the auxiliary wind wheel is arranged at the end part of the shaft body of the auxiliary transmission shaft in a transmission structure device which rotates opposite to the main wind wheel in a wind direction; the annular rotor (14) of the generator is driven by a main drive shaft (13); the annular rotor is a structural device which surrounds and can rotate around the permanent magnet inner rotor, and the annular rotor is configured in a structure rotating relative to the stator.
2. A nested dual rotor electric machine according to claim 1 wherein said secondary wind wheels are windingly rotatably mounted in an upward wind direction according to the F2 direction; the main wind wheel (3) is assembled on a main transmission shaft (13) in a transmission structure rotating in a downwind direction; and a brake (15) for braking the auxiliary wind wheel is arranged between the generator end cover and the hub of the auxiliary wind wheel.
3. A nested dual rotor electric machine according to claim 1 or 2, wherein said annular rotor (14) is comprised of an annular rotor core (141) surrounding the permanent magnet inner rotor and annular rotor inner windings (142), annular rotor outer windings (143) matingly engaged with the annular rotor core; the main transmission shaft and the auxiliary transmission shaft are provided with hollow through holes (120, 130) with preset diameters.
4. A nested twin rotor machine according to claim 3 in which one end of the main drive shaft is supported by a second bearing (116) located at the second end cap (112) of the generator to extend out of the housing and engage the main rotor, the other end of the main drive shaft extending into the housing and engaging the ring rotor in a power transmitting configuration via a ring rotor support unit (140); the auxiliary transmission shaft is supported by a first bearing (115) arranged at the first end cover (111) of the generator and extends out of the shell (11) to be provided with an auxiliary wind wheel.
5. A nested dual rotor motor as claimed in claim 4 wherein the location where the annular rotor support unit is coupled to the drive shaft is provided with bearing means (1401) for rotating the annular rotor with the main drive shaft; the annular rotor surrounds the permanent magnet inner rotor (17) and is arranged on the main transmission shaft (13) by annular rotor supporting units (140) respectively arranged at two ends of the annular rotor.
6. A variable-speed variable-frequency excitation system of a wind turbine generator comprises a generator (M), and is characterized in that a permanent magnet inner rotor (17) which is driven by an auxiliary transmission shaft (12) of the generator and rotates relative to a stator (16) is arranged on the auxiliary transmission shaft; a ring-shaped rotor (14) which is driven by a main transmission shaft (13) of the generator to rotate relative to the stator is arranged on the main transmission shaft; the annular rotor is arranged in a structure surrounding the permanent magnet inner rotor and can rotate around the permanent magnet inner rotor; the number of pole pairs of an inner side winding (142) of the annular rotor is consistent with the number of pole pairs of the inner permanent magnet rotor and is set as a (Pe) antipode; the number of pole pairs of the outer winding (143) of the annular rotor is consistent with the number of pole pairs of the stator winding and is set as (Pg) opposite poles, and the outer winding and the inner winding of the annular rotor are connected in an inverted phase sequence through a connecting wire (123) between the windings of the annular rotor;
the main wind wheel and the auxiliary wind wheel are provided with a main wind wheel rotating speed measuring device (G) and an auxiliary wind wheel rotating speed measuring device (G1) which can transmit rotating speed signals to the unit centralized control device (5),
the unit centralized control device is also provided with a port (D1) connected with the wind speed detection device, a port (D2) connected with the wind direction detection device and a port (D3) for transmitting data with an upper computer;
the yaw controller (6) is connected with the unit centralized control device in a mode of controlling the main wind wheel to rotate in the downwind direction; the main wind wheel and the auxiliary wind wheel are respectively provided with a main wind wheel variable pitch regulating mechanism (38) and an auxiliary wind wheel variable pitch regulating mechanism (28) for regulating the pitch angle, and the main wind wheel variable pitch regulating mechanism and the auxiliary wind wheel variable pitch regulating mechanism are connected with the unit centralized control device (5) in a mode of controlling the variable pitch of the wind wheel variable pitch regulating mechanisms;
the voltage output end of the generator is sequentially connected with a grid-connected frequency converter (7) and a booster transformer (8) and then connected with an external power grid (W); a voltage detection device (G4) connected with the unit centralized control device and an output current detection device (G3) connected with the unit centralized control device are sequentially arranged between the grid-connected frequency converter and the step-up transformer; an idle load detection device (G5) connected with the unit centralized control device is arranged between the generator and the grid-connected frequency converter.
7. The variable-speed variable-frequency excitation system of the wind turbine generator set according to claim 6, wherein the main and auxiliary wind wheel pitch regulation mechanisms have the same structure and are composed of pitch control servomechanisms (381, 281) and pitch control devices (382, 282), and the unit centralized control device is connected with the pitch control servomechanisms through the pitch control devices; an auxiliary wind wheel pitch angle measuring device (G28) and a main wind wheel pitch angle measuring device (G38) are respectively arranged in the main wind wheel and the auxiliary wind wheel; the wind sweeping area of the main wind wheel blade is 2-5 times larger than that of the auxiliary wind wheel blade; and the pole pair number Pg of the outer side winding of the annular rotor is set to be larger than the pole pair number Pe of the inner side winding of the annular rotor.
8. The wind turbine generator variable speed, variable frequency excitation system according to claim 6 or 7, wherein the main and auxiliary wind wheel pitch adjustment mechanisms are driven by servo motors (M38, M28); the variable pitch servo mechanism is electrically connected with the unit centralized control device in a mode of adjusting the rotating speed of the main wind wheel and the auxiliary wind wheel according to the change of the pitch angle; the wind sweeping area of the main wind wheel blade is about 3 times of that of the auxiliary wind wheel blade.
9. The variable-speed variable-frequency excitation system of the wind turbine generator set according to claim 8, wherein the primary wind wheel is arranged in a downwind-to-windward rotation structure, the secondary wind wheel is arranged in an upwind-reverse-to-windward rotation structure, and the brake (15) is arranged between a generator end cover and a secondary wind wheel hub; the number of pole pairs of the outer side winding of the annular rotor can be 3 times that of the pole pairs of the inner side winding of the annular rotor.
10. The variable-speed variable-frequency excitation system of the wind turbine generator set according to claim 9, wherein a main wind wheel of the generator is arranged on a main transmission shaft, and rotates at a speed of Nzr relative to a stator with a Pg pole pair under the action of wind power, and the rotating speed of the main wind wheel satisfies the following relational expression:
wherein: nzr represents the main wind wheel speed; pg represents the number of pole pairs of the stator winding; pe represents the pole pair number of the permanent magnet inner rotor; fg denotes the stator frequency; fe represents the reduced frequency of the permanent magnet inner rotor;
the auxiliary wind wheel of the generator is arranged on the auxiliary transmission shaft, the auxiliary wind wheel drives the permanent magnet inner rotor to rotate reversely relative to the main wind wheel at the Ne speed, and the converted frequency of the permanent magnet inner rotor satisfies the following relational expression:
the auxiliary transmission shaft is provided with a permanent magnet inner rotor which rotates relatively at the Nzre rotating speed and has Pe pole pairs, and the rotating speed of the permanent magnet inner rotor relative to the annular rotor meets the following relational expression: nzre = Nzr + Ne
Wherein: nzre represents the rotational speed at which the permanent magnet inner rotor rotates relative to the annular rotor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2006201517764U CN201018445Y (en) | 2006-12-15 | 2006-12-15 | Overlapping dual-rotor motor and variable speed and variable frequency excitation system of the wind generating set |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2006201517764U CN201018445Y (en) | 2006-12-15 | 2006-12-15 | Overlapping dual-rotor motor and variable speed and variable frequency excitation system of the wind generating set |
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| CN201018445Y true CN201018445Y (en) | 2008-02-06 |
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| CNU2006201517764U Expired - Fee Related CN201018445Y (en) | 2006-12-15 | 2006-12-15 | Overlapping dual-rotor motor and variable speed and variable frequency excitation system of the wind generating set |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102177336B (en) * | 2008-10-09 | 2013-12-04 | 比罗空气能源公司 | Wind powered apparatus having counter rotating blades |
| CN103986290A (en) * | 2014-05-23 | 2014-08-13 | 东南大学 | Efficient and integrated double-rotor bidirectional power generator device |
| CN106664046A (en) * | 2014-06-26 | 2017-05-10 | 通用电气公司 | Power generation system control following transient grid event |
| KR102518672B1 (en) * | 2022-12-09 | 2023-04-05 | 박명수 | generator with multiple outputs |
-
2006
- 2006-12-15 CN CNU2006201517764U patent/CN201018445Y/en not_active Expired - Fee Related
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102177336B (en) * | 2008-10-09 | 2013-12-04 | 比罗空气能源公司 | Wind powered apparatus having counter rotating blades |
| CN103986290A (en) * | 2014-05-23 | 2014-08-13 | 东南大学 | Efficient and integrated double-rotor bidirectional power generator device |
| CN103986290B (en) * | 2014-05-23 | 2016-11-02 | 东南大学 | A kind of effective integrated birotor two-way generator device |
| CN106664046A (en) * | 2014-06-26 | 2017-05-10 | 通用电气公司 | Power generation system control following transient grid event |
| CN106664046B (en) * | 2014-06-26 | 2019-05-10 | 通用电气公司 | The electricity generation system of transient grid event is followed to control |
| KR102518672B1 (en) * | 2022-12-09 | 2023-04-05 | 박명수 | generator with multiple outputs |
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