Voltage regulating method for output line voltage of three-phase alternating-current wind driven generator

Abstract

The invention relates to the technical field of wind driven generator voltage regulation, in particular to a three-phase alternating current wind driven generator output line voltage regulation method, which comprises a three-phase alternating current wind driven generator, an insulating liquid cooling chamber, a plurality of groups of wiring circuits, a plurality of groups of array type electromagnetic switches, an intelligent gear switch with a plurality of groups of gears, and an intelligent AC current detector. An AC current value If signal output by the three-phase AC wind driven generator in real time is collected through the intelligent AC current detector and transmitted to the intelligent gear switch, and the intelligent gear switch selects a gear conforming to the AC current value If according to the range where the AC current value If signal is located and outputs a voltage range matched with a load rated line voltage. The cost is reduced; copper loss, iron loss, magnetic leakage loss and the like are reduced, and the output efficiency is improved.

Description

Technical Field

[0001] The invention relates to the technical field of voltage regulation of wind turbine generators, and in particular to a voltage regulation method for output line voltage of a three-phase AC wind turbine generator. Background Art

[0002] Existing three-phase AC wind turbine external voltage regulation technologies usually use MPPT, PWM controller, wind power converter, reactive compensation embedded voltage regulator (AVC), step-by-step voltage regulation control technology, fast frequency modulation and reactive voltage regulation technology, on-load voltage regulation transformer voltage regulation technology, SVGC static transformer and capacitor bank voltage regulation technology, etc. These voltage regulation technologies are all mandatory voltage regulation technologies outside the three-phase AC generator body, which are costly and seriously affect the output efficiency of the three-phase AC generator.

[0003] The existing voltage regulation technology in the body of three-phase AC wind turbine usually adopts active support technology of doubly fed wind power system, rotating voltage regulating brush, automatic voltage regulator (AVR), digital voltage regulation technology, phase compound excitation automatic voltage regulation, contact voltage regulator, transistor voltage regulator. These voltage regulation technologies mainly adjust the output voltage by changing the excitation current of the rotor of the three-phase AC wind turbine. They are greatly affected by the speed of the generator (end voltage), have high energy consumption, large maintenance workload, easy aging of equipment, small rectification power, easy to heat up, and cannot effectively adjust the voltage when the output power and the cut-in power change by N times. In view of this, we propose a voltage regulation method for the output line voltage of a three-phase AC wind turbine. Summary of the invention

[0004] The object of the present invention is to provide a method for regulating the output line voltage of a three-phase AC wind turbine generator to solve the problems raised in the above background technology.

[0005] To achieve the above object, the present invention provides the following technical solutions:

[0006] A voltage regulating method for output line voltage of a three-phase AC wind turbine generator, comprising a three-phase AC wind turbine generator, an insulating liquid cooling chamber, n1 groups of wiring circuits, n2 groups of array electromagnetic switches, an intelligent gear switch with n3 groups of gears, and an intelligent AC current detector; n1=n2=n3≥2;

[0007] The intelligent AC current detector collects the real-time output AC current value IF of the three-phase AC wind turbine and transmits the signal to the intelligent gear switch;

[0008] The intelligent gear switch selects a gear that matches the AC current value If signal according to its range, and this gear is connected to a corresponding group of control coil circuits of the array electromagnetic switch, and the control coil circuit receives power and starts working;

[0009] Each contact of the array electromagnetic switch is attracted from a normally open state to a closed state, and each contact of this group of array electromagnetic switches is connected to a group of wiring circuits corresponding to it, and this group of wiring circuits is connected to each end of each coil of the N (≥1) groups of coils of the armature winding of each phase of the stator of the three-phase AC wind generator. When this group of wiring circuits is in a working state, the combination mode between the N groups of coils of the armature winding of each phase of the stator of the three-phase AC wind generator changes accordingly;

[0010] The insulating liquid cooling chamber cools the heat generated by the N sets of coils of the armature windings of each phase of the stator of the three-phase AC wind generator, thereby outputting a voltage range that matches the rated line voltage of the load.

[0011] Preferably, the connection method between the N groups of coils of the armature windings of each phase of the stator of the three-phase AC wind generator is a contact type connection, there are multiple wiring methods between the N groups of coils of the armature windings of each phase of the stator of the three-phase AC wind generator, and the three-phase AC wind generator adopts a star wiring method and a triangle wiring method, and an n1 group of wiring circuits are arranged outside the stator.

[0012] Preferably, the insulating liquid cooling chamber is provided between the stator of the three-phase AC wind turbine and a plurality of groups of the array-type electromagnetic switches;

[0013] Each end of each coil of the N groups of coils of the armature winding of each phase of the stator of the three-phase AC wind generator is immersed in the insulating liquid in the insulating liquid cooling chamber, and each group of wiring circuits of the plurality of groups of wiring circuits extends into the insulating liquid cooling chamber after passing through each group of array-type electromagnetic switches of the array-type electromagnetic switches and is connected one-to-one with each end of each coil of the N groups of coils of the armature winding of each phase of the stator of the three-phase AC wind generator.

[0014] Preferably, the wiring circuit is provided with n1 groups;

[0015] The stator armature winding of each phase of the three-phase AC wind turbine adopts a wiring method in which the N groups of coils of the N groups of coils are evenly divided into one group, and the coils are all connected in series end to end, and the three-phase AC wind turbine adopts a star wiring method as a first wiring circuit;

[0016] The N groups of stator winding coils of each phase of the three-phase AC wind generator adopt a method of connecting all coils in series end to end by evenly dividing the N groups into one group, and the three-phase AC wind generator adopts a triangle connection method as the second group of connection circuits;

[0017] The N groups of stator winding coils of each phase of the three-phase AC wind turbine are divided into two groups by the N groups, all coils in each group are connected in series, and the two groups are connected in parallel, and the three-phase AC wind turbine adopts a star connection method as the third group of wiring circuits;

[0018] The N groups of stator winding coils of each phase of the three-phase AC wind turbine are divided into three groups by the N groups, all coils in each group are connected in series, and the three groups are connected in parallel, and the three-phase AC wind turbine adopts a star connection method as a fourth group of connection circuits;

[0019] The N groups of stator winding coils of each phase of the three-phase AC wind turbine adopt a wiring method in which the N groups are divided into two groups, all coils in each group are connected in series, and the two groups are connected in parallel, and the three-phase AC wind turbine adopts a triangle wiring method as the fifth wiring circuit;

[0020] The N groups of stator winding coils of each phase of the three-phase AC wind turbine are divided into four groups by the N groups, all coils in each group are connected in series, and the four groups are connected in parallel, and the three-phase AC wind turbine adopts a star connection method as the sixth group of connection circuits;

[0021] The N groups of stator winding coils of each phase of the three-phase AC wind turbine adopt a connection method in which the N groups are all five groups, all coils of each group are connected in series, and the five groups are connected in parallel, and the three-phase AC wind turbine adopts a star connection method as the seventh group of connection circuits;

[0022] The voltage is reduced successively, and the same logic is applied until the N groups of coils of the stator armature windings of each phase of the three-phase AC wind generator are evenly divided into N groups, and all the coils in each group are connected in parallel first and then in parallel last, and the N groups are connected in parallel again, and the three-phase AC wind generator adopts a triangle connection method as the n1th group connection circuit.

[0023] Preferably, a group of the array-type electromagnetic switches is provided between the front end of each group of the wiring circuits and the insulating liquid cooling chamber; the number of the n2 groups of the array-type electromagnetic switches is equal to the number of the n1 groups of the wiring circuits;

[0024] Each contact of each group of array electromagnetic switches of the array electromagnetic switches is connected one by one with each wire end of each group of wiring circuits of the wiring circuits, and each wire end of each group of wiring circuits of the wiring circuits is connected one by one with each end of each coil of each of the N groups of coils of the armature winding of each phase of the stator of the three-phase AC wind turbine;

[0025] The current loop of the N groups of coils of the armature winding of each phase of the stator of the three-phase AC wind turbine is closed or opened through each contact of each group of the array electromagnetic switch; the control coil loop of the array electromagnetic switch is connected to the intelligent gear switch.

[0026] Preferably, the intelligent gear switch is provided with n3 groups of gears, the same number as n1 groups;

[0027] The AC current If value corresponding to the first group of gears is:

[0028] The second group of gears corresponds to the AC current If value

[0029] The third group of gears corresponds to an AC current If value of 2Iref≤If<3Iref;

[0030] The fourth gear position corresponds to the AC current If value of

[0031] The fifth gear position corresponds to the AC current If value

[0032] The sixth gear position corresponds to an AC current value of 4Iref≤If<5Iref;

[0033] The seventh gear position corresponds to the AC current value of

[0034] And so on.

[0035] The AC current If corresponding to the n3th gear position is

[0036] Each group of gears of the intelligent gear switch corresponds to a group of control coil loops of the array electromagnetic switch; the gear selection of the intelligent gear switch is determined by the range of the AC current value If collected by the intelligent AC current detector.

[0037] Preferably, the intelligent AC current detector is connected in series to any one wire of the three-phase three-wire system of the three-phase AC wind turbine, and the intelligent current detector is responsible for collecting the AC current value IF output by the three-phase AC wind turbine in real time and transmitting it to the intelligent gear switch.

[0038] Preferably, assuming that N≥1, n1=n2=n3≥2, the current loop of the first group of wiring circuits of the n1 group of wiring circuits is disconnected or closed through the contacts of the first group of array electromagnetic switches of the n2 group of array electromagnetic switches, and the current loop of the control coil of the first group of array electromagnetic switches of the n2 group of array electromagnetic switches is connected or disconnected through the first gear of the intelligent gear switch with n3 groups of gears, and the selection of the first gear of the intelligent gear switch is determined by the If collected by the intelligent AC current detector. range to select; the current loop of the second group of wiring circuits of the n1 group of wiring circuits is opened or closed through each contact of the second group of array electromagnetic switches of the n2 group of array electromagnetic switches, and the current loop of the control coil of the second group of array electromagnetic switches of the n2 group of array electromagnetic switches is connected or disconnected through the second gear of the intelligent gear switch with n3 group of gears, and the selection of the second gear of the intelligent gear switch is determined by the If collected by the intelligent AC current detector. range to select; the current loop of the third group of wiring circuits of the n1 group of wiring circuits is disconnected or closed through each contact of the third group of array electromagnetic switches of the n2 group of array electromagnetic switches, and the current loop of the control coil of the third group of array electromagnetic switches of the n2 group of array electromagnetic switches is connected or disconnected through the third gear of the intelligent gear switch with n3 group gears, and the selection of the third gear of the intelligent gear switch is selected by the If collected by the intelligent AC current detector in the range of 2Iref≤If<3Iref; the current loop of the fourth group of wiring circuits of the n1 group of wiring circuits is disconnected or closed through each contact of the fourth group of array electromagnetic switches of the n2 group of array electromagnetic switches, and the current loop of the control coil of the fourth group of array electromagnetic switches of the n2 group of array electromagnetic switches is connected or disconnected through the fourth gear of the intelligent gear switch with n3 group gears, and the selection of the fourth gear of the intelligent gear switch is selected by the If collected by the intelligent AC current detector in the range of 2Iref≤If<3Iref. range to select; the current loop of the fifth group of wiring circuits of the n1 group of wiring circuits is disconnected or closed through each contact of the fifth group of array electromagnetic switches of the n2 group of array electromagnetic switches, and the current loop of the control coil of the fifth group of array electromagnetic switches of the n2 group of array electromagnetic switches is connected or disconnected through the fifth gear of the intelligent gear switch with n3 group gears, and the selection of the fifth gear of the intelligent gear switch is determined by the If collected by the intelligent AC current detector. range to select; the current loop of the sixth wiring circuit of the wiring circuit of the n1 group is disconnected or closed through each contact of the sixth array electromagnetic switch of the n2 group of array electromagnetic switches, and the current loop of the control coil of the sixth array electromagnetic switch of the n2 group of array electromagnetic switches is connected or disconnected through the sixth gear of the intelligent gear switch with n3 group gears, and the selection of the sixth gear of the intelligent gear switch is selected by the If collected by the intelligent AC current detector in the range of 4Iref≤If<5Iref; the current loop of the seventh wiring circuit of the wiring circuit of the n1 group is disconnected or closed through each contact of the seventh array electromagnetic switch of the n2 group of array electromagnetic switches, and the current loop of the control coil of the seventh array electromagnetic switch of the n2 group of array electromagnetic switches is connected or disconnected through the seventh gear of the intelligent gear switch with n3 group gears, and the selection of the seventh gear of the intelligent gear switch is selected by the If collected by the intelligent AC current detector in the range of 4Iref≤If<5Iref. range to select; and so on, the current loop of the n1th group of wiring circuits of the n1th group of wiring circuits is opened or closed through each contact of the n2th group of array electromagnetic switches of the n2th group of array electromagnetic switches, and the current loop of the control coil of the n2th group of array electromagnetic switches of the n2th group of array electromagnetic switches is connected or disconnected through the n3th gear of the intelligent gear switch with n3 groups of gears, and the selection of the n3th gear of the intelligent gear switch is determined by the If collected by the intelligent AC current detector.

[0039] Preferably, when the wind speed is vm / s, the intelligent gear switch is in the first gear and the three-phase AC wind turbine is switched on to generate electricity to a load with a rated line voltage of V, the AC current value collected by the intelligent AC current detector is used as the reference value Iref;

[0040] The three-phase AC wind turbine generator has a rated line voltage of When the same load is powered, the intelligent AC current detector collects the AC current value If The intelligent gear switch selects the second gear according to the range of If, so that the output line voltage is within the rated line voltage. When the three-phase AC wind turbine supplies power to a load of the same nature with a rated line voltage of V / 2 under the same wind speed conditions above, the intelligent AC current detector collects an AC current value If within the range of 2Iref≤If<3Iref and transmits it to the intelligent gear switch, and the intelligent gear switch selects the third gear according to the range of If, so that the output line voltage matches the rated line voltage V / 2; When the three-phase AC wind turbine supplies power to a load of the same nature with a rated line voltage of V / 3 under the same wind speed conditions above, the intelligent AC current detector collects an AC current value If within the range of 2Iref≤If<3Iref and transmits it to the intelligent gear switch, and the intelligent gear switch selects the third gear according to the range of If, so that the output line voltage matches the rated line voltage V / 2; When the three-phase AC wind turbine supplies power to a load of the same nature with a rated line voltage of V / 3 under the same wind speed conditions above, the intelligent AC current detector collects an AC current value If within the range of The intelligent gear switch selects the fourth gear according to the range of If, so that the output line voltage matches the rated line voltage V / 3; the three-phase AC wind turbine outputs the rated line voltage to the range of V / 3 under the same wind speed conditions. When the same load is powered, the intelligent AC current detector collects the AC current value If The intelligent gear switch selects the fifth gear according to the range of If, so that the output line voltage is within the rated line voltage. When the three-phase AC wind turbine supplies power to a load of the same nature with a rated line voltage of V / 4 under the same wind speed conditions above, the intelligent AC current detector collects an AC current value If within the range of 4Iref≤If<5Iref and transmits it to the intelligent gear switch, and the intelligent gear switch selects the sixth gear according to the range of If, so that the output line voltage matches the rated line voltage V / 4. When the three-phase AC wind turbine supplies power to a load of the same nature with a rated line voltage of V / 5 under the same wind speed conditions above, the intelligent AC current detector collects an AC current value If within the range of 4Iref≤If<5Iref and transmits it to the intelligent gear switch. The intelligent gear switch selects the sixth gear according to the range of If, so that the output line voltage matches the rated line voltage V / 4. The intelligent gear switch selects the seventh gear according to the range of If, so that the output line voltage matches the rated line voltage V / 5, and so on;

[0041] The three-phase AC wind turbine generator has a rated line voltage of When the same load is powered, the intelligent AC current detector collects the AC current value If Iref≤If<rated line current and transmitted to the intelligent gear switch, the intelligent gear switch selects the n3th gear according to the range of If, so that the output line voltage is within the rated line voltage. Matching range;

[0042] As mentioned above, the line voltage output by the three-phase AC wind turbine generator is Integer multiple of the step-down Multiple buck mode.

[0043] Preferably, when the wind speed is vm / s, the intelligent gear switch is in the first gear and the three-phase AC wind turbine is switched on to generate electricity to a load with a rated line voltage of V, the AC current value collected by the intelligent AC current detector is used as the reference value Iref;

[0044] The three-phase AC wind turbine generator has a rated line voltage of When the same load is powered, the intelligent AC current detector collects the AC current value If Iref≤If<rated line current and transmitted to the intelligent gear switch, the intelligent gear switch selects the n3th gear according to the range of If, so that the output line voltage is within the rated line voltage. When the three-phase AC wind turbine supplies power to a load of the same nature with a rated line voltage of V / 5 under the same wind speed conditions, the AC current value If collected by the intelligent AC current detector is within the range of And transmit it to the intelligent gear switch, the intelligent gear switch selects the seventh gear according to the range of If, so that the output line voltage matches the rated line voltage V / 5. When the three-phase AC wind turbine supplies power to the same load with a rated line voltage of V / 4 under the same wind speed conditions above, the intelligent AC current detector collects the AC current value If in the range of 4Iref≤If<5Iref and transmits it to the intelligent gear switch, the intelligent gear switch selects the sixth gear according to the range of If, so that the output line voltage matches the rated line voltage V / 4. When the three-phase AC wind turbine supplies power to the same load with a rated line voltage of V / 4 under the same wind speed conditions above, the intelligent AC current detector collects the AC current value If in the range of 4Iref≤If<5Iref and transmits it to the intelligent gear switch, the intelligent gear switch selects the sixth gear according to the range of If, so that the output line voltage matches the rated line voltage V / 4. When the same load is powered, the intelligent AC current detector collects the AC current value If And transmitted to the intelligent gear switch, the intelligent gear switch selects the fifth gear according to the range of If, so that the output line voltage is equal to the rated line voltage When the three-phase AC wind turbine supplies power to a load of the same nature with a rated line voltage of V / 3 under the same wind speed conditions above, the AC current value If collected by the intelligent AC current detector is And transmit it to the intelligent gear switch, the intelligent gear switch selects the fourth gear according to the range of If, so that the output line voltage matches the rated line voltage V / 3; when the three-phase AC wind turbine supplies power to the same load with a rated line voltage of V / 2 under the same wind speed conditions above, the intelligent AC current detector collects the AC current value If in the range of 2Iref≤If<3Iref and transmits it to the intelligent gear switch, the intelligent gear switch selects the third gear according to the range of If, so that the output line voltage matches the rated line voltage V / 2; when the three-phase AC wind turbine supplies power to the same load with a rated line voltage of V / 2 under the same wind speed conditions above, the intelligent AC current detector collects the AC current value If in the range of 2Iref≤If<3Iref and transmits it to the intelligent gear switch, the intelligent gear switch selects the third gear according to the range of If, so that the output line voltage matches the rated line voltage V / 2; When the same load is powered, the intelligent AC current detector collects the AC current value If And transmitted to the intelligent gear switch, the intelligent gear switch selects the second gear according to the range of If, so that the output line voltage is within the rated line voltage The matching range.

[0045] As mentioned above, the line voltage output by the three-phase AC wind turbine generator is Integer multiple boost, Multiple boost mode.

[0046] Compared with the prior art, the invention has the following advantages: the invention uses the working principle that different series, parallel and series-parallel connection methods between the number of battery groups can output voltages with an integral multiple of phase difference; and the output line voltage of the three-phase AC generator using the star connection method is the output line voltage of the triangle connection method. The working principle of the multiple; the modified method also includes a three-phase AC generator, an insulating liquid cooling chamber, a plurality of wiring circuits, a plurality of array electromagnetic switches, an intelligent gear switch with a plurality of gears, and an intelligent AC current detector; the real-time AC current value Ⅰf signal output by the three-phase AC wind turbine is collected by the intelligent AC current detector and transmitted to the intelligent gear switch, and the intelligent gear switch selects a gear that matches the current value Ⅰf according to the range of the current value Ⅰf signal, and this gear is connected to a corresponding group of control coil circuits of the array electromagnetic switch, and the control coil circuit starts working after receiving power. , each contact of this group of array electromagnetic switches is attracted from the normally open state to the closed state, and each contact of this group of array electromagnetic switches is connected to a group of wiring circuits connected to it, and this group of wiring circuits connects each end of each coil of the N groups of coils of the stator of each phase of the three-phase AC wind turbine. When this group of wiring circuits is in working state, the combination mode between the N groups of coils of the stator of each phase of the three-phase AC wind turbine changes accordingly, and at the same time, the insulating liquid cooling chamber cools the heat generated by the N groups of coils of the stator of each phase of the three-phase AC wind turbine. When the rated line voltage of the load remains unchanged and the real-time output AC current Ⅰf value is 1 to N times greater than the AC current Ⅰref value of the cut-in power generation output, the output line voltage of the three-phase AC wind turbine can be adjusted by integer multiples and The voltage is adjusted by multiples to match the rated line voltage of the load, reducing costs; reducing copper loss, iron loss, leakage magnetic loss, etc., and improving output efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0047] Figure 1 This is a flow chart of voltage regulation of a three-phase AC wind turbine generator according to the present invention;

[0048] Figure 2 The working principle diagram of the three-phase AC wind turbine generator of the present invention, wherein the battery groups used for the output line voltage integer multiple voltage regulation adopt different series, parallel, and series-parallel wiring methods to output voltages with an integer multiple difference;

[0049] Figure 3 The output line voltage of the three-phase AC wind turbine generator of the present invention is Multiple voltage regulation uses a three-phase AC generator with a star connection method to output a higher line voltage than the line voltage output with a delta connection method. The working principle diagram of the multiple;

[0050] Figure 4 The invention provides a three-phase AC wind turbine generator output line voltage integer multiple voltage regulation and AC current value of multiple voltage regulation Ⅰf in Ⅰ Ⅰ Ref range of working principle diagram;

[0051] Figure 5The invention provides a three-phase AC wind turbine generator output voltage integral multiple voltage regulation and The AC current value of multiple voltage regulation If is Schematic diagram of working principle within the scope;

[0052] Figure 6 The invention provides a three-phase AC wind turbine generator output line voltage integer multiple voltage regulation and The AC current value of multiple voltage regulation If is Schematic diagram of working principle within the scope;

[0053] Figure 7 The invention provides a three-phase AC wind turbine generator output line voltage integer multiple voltage regulation and The AC current value of multiple voltage regulation If is Schematic diagram of working principle within the scope;

[0054] Figure 8 The invention provides a three-phase AC wind turbine generator output line voltage integer multiple voltage regulation and The AC current value of multiple voltage regulation If is Schematic diagram of working principle within the scope;

[0055] Fig. 9 The invention provides a three-phase AC wind turbine generator output line voltage integer multiple voltage regulation and The AC current value of multiple voltage regulation If is Working principle diagram within the range of Ⅰref≤Ⅰf<rated line current. DETAILED DESCRIPTION

[0056] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0057] like Figure 1As shown, the real-time output AC current value IF signal of the three-phase AC wind turbine is collected by the intelligent AC current detector and transmitted to the intelligent gear switch. The intelligent gear switch selects a gear that matches the current value IF according to the range of the AC current value IF signal. This gear is connected to a control coil circuit of a corresponding group of array electromagnetic switches. The control coil circuit gets power and starts working. Each contact of this group of array electromagnetic switches is attracted from a normally open state to a closed state. Each contact of this group of array electromagnetic switches is connected to a corresponding group of wiring circuits. This group of wiring circuits is connected to each end of each coil of the N groups of coils of the stator armature winding of each phase of the three-phase AC wind turbine. The combination mode between the N groups of coils of the stator armature winding of each phase of the three-phase AC wind turbine changes accordingly. This group of wiring circuits is in a working state, and other groups of wiring circuits are in an idle state. At the same time, the insulating liquid cooling chamber cools the heat generated by the N groups of coils of the stator armature winding of each phase of the three-phase AC wind turbine. At this time, the three-phase AC wind turbine generator is both a generator and a transformer, thereby outputting a voltage range that matches the rated voltage of the load.

[0058] like Figure 2 As shown, the working principle of using different series, parallel, and series-parallel wiring methods between battery groups can output voltages with an integral multiple of phase difference. The six groups of coils of the armature winding of each phase of the stator of the three-phase AC wind turbine are regarded as six groups of battery groups. The six groups are divided into one group with the head and tail (positive and negative) connected in series to output a voltage of V; the six groups are divided into two groups, each group of battery groups is connected in series (positive and negative), and the two groups are connected in parallel to output a voltage of V / 2; the six groups are divided into three groups, each group of battery groups is connected in series (positive and negative), and the three groups are connected in parallel to output a voltage of V / 3; the six groups are divided into six groups, each group of battery groups is connected in parallel (positive and positive) and in parallel (negative and negative) to output a voltage of V / 6.

[0059] like Figure 3 As shown in the figure, the output line voltage of a three-phase AC generator using a star connection method is the output line voltage of a three-phase AC generator using a delta connection method. The working principle of multiples is that under the same conditions, the line voltage output by the same three-phase AC wind turbine using the star connection method is times the output phase voltage. The output line voltage of the triangle connection method is equal to the output phase voltage. Therefore, the output line voltage of the same three-phase AC wind turbine using the star connection method under the same conditions is the output line voltage of the triangle connection method. multiple.

[0060] like Figure 4-Figure 9As shown, it also includes a three-phase AC wind turbine generator, an insulating liquid cooling chamber, n2 groups of wiring circuits, n2 groups of array electromagnetic switches, an intelligent gear switch with n3 groups of gears, and an intelligent AC current detector. In this specific embodiment, N=4, n1=n2=n3=6, a three-phase AC wind turbine generator output line voltage integer multiple voltage regulation, The method and applicable scope of multiple voltage regulation.

[0061] like Figure 4-Figure 9 As shown, all the core design parameters of the three-phase AC wind turbine generator do not need to be changed. The connection method between the four groups of coils of the armature winding of each phase of the stator of the three-phase AC wind turbine generator is changed from fixed connection to contact connection. There are three ways to connect the four groups of coils of the armature winding of each phase of the stator of the three-phase AC wind turbine generator, and the three-phase AC wind turbine generator alternately uses the star connection method and the triangle connection method to set six groups of connection circuits outside the stator.

[0062] like Figure 4-Figure 9 As shown, the insulating liquid cooling chamber is arranged between the stator of the three-phase AC wind turbine generator and the six groups of array-type electromagnetic switches. Each end of each coil of the four groups of coils of the armature winding of each phase of the stator of the three-phase AC wind turbine generator is immersed in the insulating liquid cooling chamber. Each of the six groups of wiring circuits extends into the insulating liquid cooling chamber after passing through a corresponding group of array-type electromagnetic switches and is connected one by one with each end of each coil of the four groups of coils of the armature winding of each phase of the stator of the three-phase AC wind turbine generator.

[0063] like Figure 4-Figure 9 As shown, six groups of array electromagnetic switches are arranged between the insulating liquid cooling chamber and the intelligent gear switch, and one group of array electromagnetic switches is arranged between the front end of each group of wiring circuits and the insulating liquid cooling chamber; the current loops of the four groups of coils of the armature windings of each phase of the stator of the three-phase AC wind turbine are closed or disconnected through the contacts of the array electromagnetic switches; the number of the six groups of array electromagnetic switches is equal to the number of the six groups of wiring circuits; each contact of each group of array electromagnetic switches is connected to each wire end of each group of wiring circuits in turn, and the control coil loops of the six groups of array electromagnetic switches are connected with the gear switches, and each gear of the gear switches is correspondingly connected to the control coil loop of one group of array electromagnetic switches.

[0064] like Figure 4-Figure 9As shown, six groups of wiring circuits are arranged in sequence beside the six groups of array electromagnetic switches. The first group of wiring circuits is that the four groups of coils of the armature winding of each phase of the three-phase AC wind turbine stator adopt the wiring method that all the coils are connected in series head to tail by the four groups and the three-phase AC wind turbine adopts the star connection method; the second group of wiring circuits is that the four groups of coils of the armature winding of each phase of the three-phase AC wind turbine stator adopt the wiring method that all the coils are connected in series head to tail by the four groups and the three-phase AC wind turbine adopts the triangle connection method; the third group of wiring circuits is that the four groups of coils of the armature winding of each phase of the three-phase AC wind turbine stator adopt the wiring method that the four groups are divided into two groups, all the coils of each group are connected in series head to tail, and the two groups are connected in parallel, and the three-phase AC wind turbine adopts the star connection method; the four groups of coils of the armature winding of each phase of the three-phase AC wind turbine stator adopt the wiring method that the four groups are divided into two groups, all the coils of each group are connected in series head to tail, and the three-phase AC wind turbine adopts the star connection method; The fourth wiring circuit is a wiring method in which 4 groups are equally divided into two groups, all coils in each group are connected in series, and the two groups are connected in parallel, and the three-phase AC wind turbine adopts a triangle connection method; the 4 groups of coils of the armature winding of each phase of the three-phase AC wind turbine stator are equally divided into three groups, and they cannot be divided into three groups and are discarded; the 4 groups of coils of the armature winding of each phase of the three-phase AC wind turbine stator are equally divided into four groups, and the four groups are connected in parallel head to head and tail to tail, and the three-phase AC wind turbine adopts a star connection method as the fifth wiring circuit; the 4 groups of coils of the armature winding of each phase of the three-phase AC wind turbine stator are equally divided into four groups, and the four groups are connected in parallel head to head and tail to tail, and the three-phase AC wind turbine adopts a triangle connection method as the sixth wiring circuit.

[0065] like Figure 4-Figure 9 As shown, an intelligent gear switch is set in the control coil current loop of the six-group array electromagnetic switch. The intelligent gear switch is provided with six groups of gears, Ⅰref is the first gear, Ⅰref is the second gear, 2Ⅰref is the third gear, Ⅰref is the fourth gear, 4Ⅰref is the fifth gear, Ⅰref is the sixth gear. Each gear of the intelligent gear switch corresponds to a control coil current loop connected to a group of array electromagnetic switches, and the gear selection of the intelligent gear switch is determined by the range of the AC current value Ⅰf collected by the intelligent AC current detector.

[0066] like Figure 4-Figure 9 As shown, the intelligent AC current detector is connected in series to any one of the three wires of the three-phase AC wind turbine. The intelligent AC current detector is responsible for collecting the AC current value Ⅰf output by the three-phase AC wind turbine in real time, and transmitting the AC current value If to the intelligent gear switch.

[0067] like Figure 4-Figure 9As shown, the intelligent AC current detector, the intelligent gear switch, the array electromagnetic switch, the wiring circuit, and the three-phase AC generator are in a one-to-one corresponding and linked relationship with each other.

[0068] like Figure 4 As shown, the intelligent AC current detector collects the real-time AC current value Ⅰf in The range is transmitted to the intelligent gear switch, and the intelligent gear switch selects the first gear according to the range of the AC current value IF. This first gear is connected to the control coil circuit of the first group of array electromagnetic switches corresponding to it. The control coil circuit gets power and starts working. The first group of array electromagnetic switches is attracted from the normally open state to the closed state, and each contact of the first group of array electromagnetic switches is connected to the first group of wiring circuits corresponding to it. At the same time, the insulating liquid cooling chamber cools the heat generated by the four groups of coils of the armature windings of each phase of the stator of the three-phase AC wind turbine. At this time, the three-phase AC wind turbine is both a generator and a transformer, so that the output voltage range matches the rated line voltage of the load.

[0069] like Figure 5 As shown, the intelligent AC current detector collects the real-time AC current value Ⅰf in The current is transmitted to the intelligent gear switch within the range of Ⅰref≤Ⅰf<2Ⅰref. The intelligent gear switch selects the second gear according to the range of AC current value Ⅰf. This second gear is connected to the control coil circuit of the corresponding second group of array electromagnetic switches. The control coil circuit gets power and starts working. The second group of array electromagnetic switches is attracted from the normally open state to the closed state. Each contact of the second group of array electromagnetic switches is connected to the corresponding second group of wiring circuits. At the same time, the insulating liquid cooling chamber cools the heat generated by the four groups of coils of the armature winding of each phase of the three-phase AC wind turbine stator. At this time, the three-phase AC wind turbine is both a generator and a transformer, so that the output voltage range matches the rated line voltage of the load.

[0070] like Figure 6 As shown, the intelligent AC current detector collects the real-time AC current value Ⅰf in The range is transmitted to the intelligent gear switch, and the intelligent gear switch selects the third gear according to the range of the AC current value IF. This third gear is connected to the control coil circuit of the corresponding third group of array electromagnetic switches. The control coil circuit gets power and starts working. The third group of array electromagnetic switches is attracted from the normally open state to the closed state. Each contact of the third group of array electromagnetic switches is connected to the corresponding third group of wiring circuits. At the same time, the insulating liquid cooling chamber cools the heat generated between the coil groups of each phase of the stator winding of the three-phase AC wind turbine. At this time, the three-phase AC wind turbine is both a generator and a transformer, so that the output voltage range matches the rated line voltage of the load.

[0071] like Figure 7 As shown, the intelligent AC current detector collects the real-time AC current value Ⅰf in The current is transmitted to the intelligent gear switch within the range of Ⅰref≤Ⅰf<4Ⅰref. The intelligent gear switch selects the fourth gear according to the range of AC current value Ⅰf. The fourth gear is connected to the control coil circuit of the corresponding fourth group of array electromagnetic switches. The control coil circuit gets power and starts working. The fourth group of array electromagnetic switches is attracted from the normally open state to the closed state. Each contact of the fourth group of array electromagnetic switches is connected to the corresponding fourth group of wiring circuits. At the same time, the insulating liquid cooling chamber cools the heat generated between the coil groups of each phase of the stator winding of the three-phase AC wind turbine. At this time, the three-phase AC wind turbine is both a generator and a transformer, so that the output voltage range matches the rated line voltage of the load.

[0072] like Figure 8 As shown, the intelligent AC current detector collects the real-time AC current value Ⅰf in The range is transmitted to the intelligent gear switch, and the intelligent gear switch selects the fifth gear according to the range of the AC current value IF. This fifth gear is connected to the control coil circuit of the corresponding fifth group of array electromagnetic switches. The control coil circuit gets power and starts working. The fifth group of array electromagnetic switches is attracted from the normally open state to the closed state, and each contact of the fifth group of array electromagnetic switches is connected to the corresponding fifth group of wiring circuits. At the same time, the insulating liquid cooling chamber cools the heat generated between the coil groups of each phase of the stator winding of the three-phase AC wind turbine. At this time, the three-phase AC wind turbine is both a generator and a transformer, so that the output voltage range matches the rated voltage of the load.

[0073] like Fig. 9 As shown, the intelligent AC current detector collects the real-time AC current value Ⅰf in The current is transmitted to the intelligent gear switch within the range of Ⅰref≤Ⅰf<rated line current. The intelligent gear switch selects the sixth gear according to the range of AC current value Ⅰf. The sixth gear is connected to the control coil circuit of the corresponding sixth group of array electromagnetic switches. The control coil circuit starts to work after receiving power. The sixth group of array electromagnetic switches is attracted from the normally open state to the closed state. Each contact of the sixth group of array electromagnetic switches is connected to the corresponding sixth group of wiring circuits. At the same time, the insulating liquid cooling chamber cools the heat generated between the coil groups of each phase of the stator winding of the three-phase AC wind turbine. At this time, the three-phase AC wind turbine is both a generator and a transformer, thereby outputting a voltage range that matches the rated line voltage of the load.

[0074] like Figures 1 to 9As shown, the embodiments provided by the present invention can also be applied to use environments where the line current output by the three-phase AC generator in real time is greater than N times the line current output when it is cut in for power generation, such as locomotive generators, hydroelectric generators, etc. It can also be applied to use environments where the DC current output in real time is greater than N times the DC current output when it is cut in for power generation, such as photovoltaic power generation, etc.

[0075] The voltage regulation method of the three-phase AC wind turbine output line voltage of the present embodiment is used to output the voltage of the phase difference of the integral multiple by using different series, parallel and series-parallel connection methods between the battery groups; and the output line voltage of the three-phase AC generator using the star connection method is the output line voltage of the triangle connection method. The working principle of the multiple; the method also includes a three-phase AC generator, an insulating liquid cooling chamber, a plurality of wiring circuits, a plurality of array electromagnetic switches, an intelligent gear switch with a plurality of gears, and an intelligent AC current detector; the three-phase AC wind turbine outputs an AC current value IF signal in real time through the intelligent AC current detector, and transmits it to the intelligent gear switch, the intelligent gear switch selects a gear that matches the current value IF according to the current value IF signal, and this gear is connected to a corresponding group of control coil circuits of the array electromagnetic switches, the control coil circuit gets power and starts working, each contact of this group of array electromagnetic switches is attracted from a normally open state to a closed state, each contact of this group of array electromagnetic switches is connected to each wire end of a corresponding group of wiring circuits, this group of wiring circuits and each end of each coil of the N groups of coils of the stator of each phase of the three-phase AC wind turbine, the combination mode between the N groups of coils of the stator of each phase of the three-phase AC generator changes accordingly, this group of wiring circuits is in a working state, and the other groups of wiring circuits are in an idle state. At the same time, the insulating liquid cooling chamber cools the heat generated by the N groups of coils of the stator armature windings of each phase of the three-phase AC wind turbine. When the rated line voltage of the load remains unchanged and the real-time output AC current If value is 1 to N times greater than the AC current Iref value of the cut-in power generation output, the output line voltage of the three-phase AC wind turbine can be adjusted by an integer multiple and The voltage is adjusted by multiples to match the rated line voltage of the load, reducing costs; reducing copper loss, iron loss, leakage magnetic loss, etc., and improving output efficiency.

[0076] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited by the above embodiments. The above embodiments and descriptions are only preferred examples of the present invention and are not intended to limit the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which fall within the scope of the present invention. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. A method for regulating the output line voltage of a three-phase AC wind turbine generator, characterized in that: It includes a three-phase AC wind turbine, an insulating liquid cooling chamber, a wiring circuit, an array electromagnetic switch, an intelligent gear switch, and an intelligent AC current detector; The wiring circuit is provided with n1 groups, the array electromagnetic switch is provided with n2 groups, the intelligent gear switch is provided with n3 groups of gears, and n1=n2=n3≥2; The intelligent AC current detector collects the real-time output AC current value IF of the three-phase AC wind turbine and transmits the signal to the intelligent gear switch; The intelligent gear switch selects a group of gears that match the range of the AC current value If signal, and this group of gears is connected to a corresponding group of control coil circuits of the array electromagnetic switch. This group of gears is in working state, and other groups of gears are in idle state; The control coil circuit of the group of array-type electromagnetic switches receives power and starts to work, the group of array-type electromagnetic switches is in working state, and the electromagnetic switches of other groups are in idle state; Each contact of the array electromagnetic switch is attracted from the normally open state to the closed state, each contact of the array electromagnetic switch is connected to each wire end of one of the wiring circuits of the wiring circuits connected thereto, the wiring circuits are connected to each end of each coil of the N sets of coils of the stator armature windings of each phase of the three-phase AC wind generator, the combination mode between the N sets of coils of the stator armature windings of each phase of the three-phase AC wind generator is changed accordingly, the wiring circuits are in the working state, and the other wiring circuits are in the idle state; The insulating liquid cooling chamber cools the heat generated by the N sets of coils of the armature windings of each phase of the stator of the three-phase AC wind generator, thereby outputting a voltage range that matches the rated line voltage of the load.

2. The method for regulating the output line voltage of a three-phase AC wind turbine generator according to claim 1, characterized in that: The connection mode between the N (N≥1) groups of coils of the armature winding of each phase of the stator of the three-phase AC wind turbine is changed from a fixed connection to a contact connection through each contact of the array electromagnetic switch; Each end of each coil of the N groups of coils of the armature winding of each phase of the stator of the three-phase AC wind generator extends into the insulating liquid cooling chamber.

3. The method for regulating the output line voltage of a three-phase AC wind turbine generator according to claim 2, characterized in that: The insulating liquid cooling chamber is arranged between the stator of the three-phase AC wind turbine and the array electromagnetic switch; Each end of each coil of the N groups of coils of the armature winding of each phase of the stator of the three-phase AC wind generator is immersed in the insulating liquid in the insulating liquid cooling chamber, and each group of wiring circuits of the wiring circuit sequentially passes through each group of array electromagnetic switches of the array electromagnetic switch and extends into the insulating liquid cooling chamber and is connected one by one with each end of each coil of the N groups of coils of the armature winding of each phase of the stator of the three-phase AC wind generator.

4. The method for regulating the output line voltage of a three-phase AC wind turbine generator according to claim 3, characterized in that: There are multiple connection methods between the N groups of coils of the armature winding of each phase of the stator of the three-phase AC wind turbine, and the three-phase AC wind turbine adopts the star connection method and the triangle connection method, and the connection circuit n1 group is arranged outside the stator; The three-phase AC wind generator adopts a wiring method in which the N groups of coils of the armature winding of each phase of the stator are evenly divided into one group, and the coils are all connected in series end to end, and the three-phase AC wind generator adopts a star wiring method as the first wiring circuit; The three-phase AC wind generator adopts a wiring method in which the N groups of coils of the armature winding of each phase of the stator are evenly divided into one group, and the coils are all connected in series end to end, and the three-phase AC wind generator adopts a triangle wiring method as the second wiring circuit; The stator armature winding of each phase of the three-phase AC wind turbine adopts a wiring method in which the N groups of coils are evenly divided into two groups, all coils in each group are connected in series, and the two groups are connected in parallel, and the three-phase AC wind turbine adopts a star wiring method as the third wiring circuit; The stator armature winding of each phase of the three-phase AC wind turbine adopts a wiring method in which the N groups of coils are evenly divided into three groups, all coils in each group are connected in series, and the three groups are connected in parallel, and the three-phase AC wind turbine adopts a star wiring method as a fourth wiring circuit; The three-phase AC wind generator adopts a wiring method in which the N groups of coils of the armature winding of each phase of the stator are divided into two groups, all the coils of each group are connected in series, and the two groups are connected in parallel, and the three-phase AC wind generator adopts a triangle wiring method as the fifth wiring circuit; The stator armature windings of each phase of the three-phase AC wind turbine have N groups of coils that are evenly divided into four groups, all coils in each group are connected in series, and the four groups are connected in parallel, and the three-phase AC wind turbine uses a star connection method as the sixth group of connection circuits; The three-phase AC wind turbine adopts a connection method in which the N groups of coils of the armature winding of each phase of the stator are connected in series, and the five groups are connected in parallel. The three-phase AC wind turbine adopts a star connection method as the seventh group of connection circuits; The voltage is reduced successively, and the same logic is applied until the N groups of coils of the stator armature windings of each phase of the three-phase AC wind turbine are evenly divided into N groups, and all the coils of each group are connected in parallel first and then last, and then the N groups are connected in parallel, and the three-phase AC wind turbine adopts a triangle connection method as the n1th group connection circuit.

5. The method for regulating the output line voltage of a three-phase AC wind turbine generator according to claim 4, characterized in that: A group of the array-type electromagnetic switches is provided between the front end of each group of the wiring circuits and the insulating liquid cooling chamber; the number of the groups of the array-type electromagnetic switches is equal to the number of the groups of the wiring circuits; Each contact of each group of array electromagnetic switches of the array electromagnetic switches is sequentially connected to each wire head of each group of wiring circuits of the wiring circuit; The current circuit of each coil of the N groups of coils of the armature winding of each phase of the stator of the three-phase AC wind turbine is closed or opened in turn through the contacts of each group of the array electromagnetic switches; the intelligent gear switch is connected to the control coil circuit of each group of the array electromagnetic switches.

6. The method for regulating the output line voltage of a three-phase AC wind turbine generator according to claim 5, characterized in that: The intelligent gear switch is provided with n3 groups of gears, the same number as n1 groups; The AC current If value corresponding to the first group of gears is: The second group of gears corresponds to the AC current If value The third group of gears corresponds to an AC current If value of 2Iref≤If<3Iref; The fourth gear position corresponds to the AC current If value of The fifth gear position corresponds to the AC current If value The sixth gear position corresponds to an AC current If value of 4Iref≤If<5Iref; The seventh gear position corresponds to the AC current If value And so on. The AC current If corresponding to the n3th gear position is Each group of gears of the intelligent gear switch corresponds to a group of control coil loops of the array electromagnetic switch; the gear selection of the intelligent gear switch is determined by the range of the AC current value If collected by the intelligent AC current detector.

7. The method for regulating the output line voltage of a three-phase AC wind turbine generator according to claim 6, characterized in that: The intelligent AC current detector is connected in series to any one of the three-phase three-wire system of the three-phase AC wind turbine. The intelligent current detector is responsible for collecting the AC current value If output by the three-phase AC wind turbine in real time and transmitting it to the intelligent gear switch.

8. The voltage regulation method for output line voltage of a three-phase AC wind turbine generator according to claim 7 is characterized in that: N≥1, n1=n2=n3≥2, the current loop of the first group of wiring circuits of the n1 group of wiring circuits is opened or closed through the contacts of the first group of array electromagnetic switches of the n2 group of array electromagnetic switches, and the current loop of the control coil of the first group of array electromagnetic switches of the n2 group of array electromagnetic switches is connected or disconnected through the first gear of the intelligent gear switch with n3 groups of gears, and the selection of the first gear of the intelligent gear switch is determined by the If collected by the intelligent AC current detector. range to select; the current loop of the second group of wiring circuits of the n1 group of wiring circuits is opened or closed through each contact of the second group of array electromagnetic switches of the n2 group of array electromagnetic switches, and the current loop of the control coil of the second group of array electromagnetic switches of the n2 group of array electromagnetic switches is connected or disconnected through the second gear of the intelligent gear switch with n3 group of gears, and the selection of the second gear of the intelligent gear switch is determined by the If collected by the intelligent AC current detector. range to select; the current loop of the third group of wiring circuits of the n1 group of wiring circuits is disconnected or closed through each contact of the third group of array electromagnetic switches of the n2 group of array electromagnetic switches, and the current loop of the control coil of the third group of array electromagnetic switches of the n2 group of array electromagnetic switches is connected or disconnected through the third gear of the intelligent gear switch with n3 group gears, and the selection of the third gear of the intelligent gear switch is selected by the If collected by the intelligent AC current detector in the range of 2Iref≤If<3Iref; the current loop of the fourth group of wiring circuits of the n1 group of wiring circuits is disconnected or closed through each contact of the fourth group of array electromagnetic switches of the n2 group of array electromagnetic switches, and the current loop of the control coil of the fourth group of array electromagnetic switches of the n2 group of array electromagnetic switches is connected or disconnected through the fourth gear of the intelligent gear switch with n3 group gears, and the selection of the fourth gear of the intelligent gear switch is selected by the If collected by the intelligent AC current detector in the range of 2Iref≤If<3Iref. range to select; the current loop of the fifth group of wiring circuits of the n1 group of wiring circuits is disconnected or closed through each contact of the fifth group of array electromagnetic switches of the n2 group of array electromagnetic switches, and the current loop of the control coil of the fifth group of array electromagnetic switches of the n2 group of array electromagnetic switches is connected or disconnected through the fifth gear of the intelligent gear switch with n3 group gears, and the selection of the fifth gear of the intelligent gear switch is determined by the If collected by the intelligent AC current detector. range to select; the current loop of the sixth wiring circuit of the wiring circuit of the n1 group is disconnected or closed through each contact of the sixth array electromagnetic switch of the n2 group of array electromagnetic switches, and the current loop of the control coil of the sixth array electromagnetic switch of the n2 group of array electromagnetic switches is connected or disconnected through the sixth gear of the intelligent gear switch with n3 group gears, and the selection of the sixth gear of the intelligent gear switch is selected by the If collected by the intelligent AC current detector in the range of 4Iref≤If<5Iref; the current loop of the seventh wiring circuit of the wiring circuit of the n1 group is disconnected or closed through each contact of the seventh array electromagnetic switch of the n2 group of array electromagnetic switches, and the current loop of the control coil of the seventh array electromagnetic switch of the n2 group of array electromagnetic switches is connected or disconnected through the seventh gear of the intelligent gear switch with n3 group gears, and the selection of the seventh gear of the intelligent gear switch is selected by the If collected by the intelligent AC current detector in the range of 4Iref≤If<5Iref. range to select; by analogy based on the current increasing in sequence, the current loop of the n1th group of wiring circuits of the n1th group of wiring circuits is disconnected or closed through the contacts of the n2th group of array electromagnetic switches of the n2th group of array electromagnetic switches, and the current loop of the control coil of the n2th group of array electromagnetic switches of the n2th group of array electromagnetic switches is connected or disconnected through the n3th gear of the intelligent gear switch with n3th group of gears, and the selection of the n3th gear of the intelligent gear switch is determined by the If collected by the intelligent AC current detector. Range to choose.

9. The method for regulating the output line voltage of a three-phase AC wind turbine generator according to claim 8, characterized in that: When the wind speed is vm / s, the intelligent gear switch is in the first gear and the three-phase AC wind turbine is switched on to generate electricity to a load with a rated line voltage of V, the AC current value collected by the intelligent AC current detector is used as a reference value Iref; The three-phase AC wind turbine generator has a rated line voltage of When the same load is powered, the intelligent AC current detector collects the AC current value If The intelligent gear switch selects the second gear according to the range of If, so that the output line voltage is within the rated line voltage. When the three-phase AC wind turbine supplies power to a load of the same nature with a rated line voltage of V / 2 under the same wind speed conditions above, the intelligent AC current detector collects an AC current value If within the range of 2Iref≤If<3Iref and transmits it to the intelligent gear switch, and the intelligent gear switch selects the third gear according to the range of If, so that the output line voltage matches the rated line voltage V / 2; When the three-phase AC wind turbine supplies power to a load of the same nature with a rated line voltage of V / 3 under the same wind speed conditions above, the intelligent AC current detector collects an AC current value If within the range of 2Iref≤If<3Iref and transmits it to the intelligent gear switch, and the intelligent gear switch selects the third gear according to the range of If, so that the output line voltage matches the rated line voltage V / 2; When the three-phase AC wind turbine supplies power to a load of the same nature with a rated line voltage of V / 3 under the same wind speed conditions above, the intelligent AC current detector collects an AC current value If within the range of The intelligent gear switch selects the fourth gear according to the range of If, so that the output line voltage matches the rated line voltage V / 3; the three-phase AC wind turbine outputs the rated line voltage to the range of V / 3 under the same wind speed conditions. When the same load is powered, the intelligent AC current detector collects the AC current value If The intelligent gear switch selects the fifth gear according to the range of If, so that the output line voltage is within the rated line voltage. When the three-phase AC wind turbine supplies power to a load of the same nature with a rated line voltage of V / 4 under the same wind speed conditions above, the intelligent AC current detector collects an AC current value If within the range of 4Iref≤If<5Iref and transmits it to the intelligent gear switch, and the intelligent gear switch selects the sixth gear according to the range of If, so that the output line voltage matches the rated line voltage V / 4; When the three-phase AC wind turbine supplies power to a load of the same nature with a rated line voltage of V / 5 under the same wind speed conditions above, the intelligent AC current detector collects an AC current value If within the range of 4Iref≤If<5Iref and transmits it to the intelligent gear switch, and the intelligent gear switch selects the sixth gear according to the range of If, so that the output line voltage matches the rated line voltage V / 4; When the three-phase AC wind turbine supplies power to a load of the same nature with a rated line voltage of V / 5 under the same wind speed conditions above, the intelligent AC current detector collects an AC current value If within the range of The intelligent gear switch selects the seventh gear according to the range of If, so that the output line voltage matches the rated line voltage V / 5; and so on; the three-phase AC wind turbine generates a rated line voltage of When the same load is powered, the intelligent AC current detector collects the AC current value If And transmitted to the intelligent gear switch, the intelligent gear switch selects the Nth gear according to the range of If, so that the output line voltage is equal to the rated line voltage Matching range; As mentioned above, the line voltage output by the three-phase AC wind turbine is V, V / 2, V / 3, V / 4, Integer multiple of the step-down Multiple buck mode.

10. The method for regulating the output line voltage of a three-phase AC wind turbine generator according to claim 9, characterized in that: When the wind speed is vm / s, the intelligent gear switch is in the first gear and the three-phase AC wind turbine is switched on to generate electricity to a load with a rated line voltage of V, the AC current value collected by the intelligent AC current detector is used as a reference value Iref; The three-phase AC wind turbine generator has a rated line voltage of When the same load is powered, the intelligent AC current detector collects the AC current value If And transmitted to the intelligent gear switch, the intelligent gear switch selects the n3th gear according to the range of If, so that the output line voltage is equal to the rated line voltage Inversely, when the three-phase AC wind turbine supplies power to a load of the same nature with a rated line voltage of V / 5 under the same wind speed conditions above, the AC current value If collected by the intelligent AC current detector is in And transmit it to the intelligent gear switch, the intelligent gear switch selects the seventh gear according to the range of If, so that the output line voltage matches the rated line voltage V / 5; when the three-phase AC wind turbine supplies power to the same load with a rated line voltage of V / 4 under the same wind speed conditions above, the intelligent AC current detector collects the AC current value If in the range of 4Iref≤If<5ref and transmits it to the intelligent gear switch, the intelligent gear switch selects the sixth gear according to the range of If, so that the output line voltage matches the rated line voltage V / 4; when the three-phase AC wind turbine supplies power to the same load with a rated line voltage of V / 4 under the same wind speed conditions above, the intelligent AC current detector collects the AC current value If in the range of 4Iref≤If<5ref and transmits it to the intelligent gear switch, the intelligent gear switch selects the sixth gear according to the range of If, so that the output line voltage matches the rated line voltage V / 4; When the same load is powered, the intelligent AC current detector collects the AC current value If And transmitted to the intelligent gear switch, the intelligent gear switch selects the fifth gear according to the range of If, so that the output line voltage is consistent with the rated line voltage When the three-phase AC wind turbine supplies power to a load of the same nature with a rated line voltage of V / 3 under the same wind speed conditions above, the AC current value If collected by the intelligent AC current detector is And transmit it to the intelligent gear switch, the intelligent gear switch selects the fourth gear according to the range of If, so that the output line voltage matches the rated line voltage V / 3; when the three-phase AC wind turbine supplies power to the same load with a rated line voltage of V / 2 under the same wind speed conditions above, the intelligent AC current detector collects the AC current value If in the range of 2Iref≤If<3Iref and transmits it to the intelligent gear switch, the intelligent gear switch selects the third gear according to the range of If, so that the output line voltage matches the rated line voltage V / 2; when the three-phase AC wind turbine supplies power to the same load with a rated line voltage of V / 2 under the same wind speed conditions above, the intelligent AC current detector collects the AC current value If in the range of 2Iref≤If<3Iref and transmits it to the intelligent gear switch, the intelligent gear switch selects the third gear according to the range of If, so that the output line voltage matches the rated line voltage V / 2; When the same load is powered, the intelligent AC current detector collects the AC current value If And transmitted to the intelligent gear switch, the intelligent gear switch selects the second gear according to the range of If, so that the output line voltage is within the rated line voltage Matching range; As mentioned above, the line voltage output by the three-phase AC wind turbine generator is V / 4, V / 3, V / 2, Integer multiples of V Multiple boost mode.

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