阅读说明：本技术 宽范围励磁发电及自动双充电的开关磁阻发电机变流系统 (Wide-range excitation power generation and automatic double-charging switched reluctance generator current transformation system ) 是由 孙冠群 李璟 翁馨 于 2019-08-20 设计创作，主要内容包括：宽范围励磁发电及自动双充电的开关磁阻发电机变流系统,其结构由两个蓄电池、十个开关管、九个二极管、五个电容器、三相绕组、两个变压器组成,两个蓄电池和三个开关管组成可以高中低宽范围励磁输出电压可调的励磁电源,极大提升了系统适应性和发电能力；直接依靠简单的各相绕组的变流回路,以及在励磁电源加持下,解决了输出发电电压可以大范围调节输出的问题,尤其高压输出时,节省了后续升压环节；对于励磁电源中不共地的两个蓄电池,本发明仅仅采用一个开关管就实现了对两个不共地的蓄电池自动隔离充电,提高了系统可持续性、可靠性,简化了结构和控制；本发明适用于各类动力输入和各类输出负载的开关磁阻发电机系统中应用。(The structure of the switched reluctance generator converter system comprises two storage batteries, ten switching tubes, nine diodes, five capacitors, a three-phase winding and two transformers, wherein the two storage batteries and the three switching tubes form an excitation power supply which can adjust high, medium and low wide range excitation output voltage, so that the system adaptability and the power generation capacity are greatly improved; the problem that the output of the output power generation voltage can be adjusted in a large range is solved by directly depending on simple variable current loops of each phase winding and under the condition of the addition of an excitation power supply, and particularly, a subsequent boosting link is saved during high-voltage output; for two storage batteries which are not in common with the ground in the excitation power supply, the invention realizes the automatic isolation charging of the two storage batteries which are not in common with the ground by only adopting one switching tube, thereby improving the sustainability and the reliability of the system and simplifying the structure and the control; the invention is suitable for application in switched reluctance generator systems of various power input and output loads.)

1. wide-range excitation power generation and automatic double-charging switched reluctance generator current transformation system is characterized by comprising: the first storage battery is connected with the anode of the first switching tube, the anode of the third switching tube, the cathode of the ninth diode and one end of the fifth capacitor, the first storage battery is connected with the anode of the second switching tube, the anode of the first diode, the anode of the second switching tube, the cathode of the fifth capacitor, the cathode of the first storage battery is connected with the anode of the second switching tube, the first diode, The cathode of the fifth switch tube, the anode of the third diode, the cathode of the seventh switch tube, the anode of the fifth diode, the cathode of the ninth switch tube, one end of the first capacitor, the other end of the fifth capacitor, one end of the secondary side winding of the second transformer, and the cathode of the tenth switch tube, wherein the cathode of the first switch tube is connected with the anode of the second storage battery, the anode of the fourth switch tube, the anode of the sixth switch tube, the anode of the eighth switch tube, the cathode of the eighth diode, one end of the fourth capacitor, the cathode of the third switch tube is connected with the cathode of the second storage battery, the cathode of the second switch tube, the other end of the fourth capacitor, and one end of the secondary side winding of the first transformer, the cathode of the fourth switch tube is connected with the cathode of the first diode and one end of the first phase winding, and the other end of the first phase winding is connected with the anode of the fifth switch tube, the cathode of a sixth switching tube is connected with the cathode of a third diode and one end of a second phase winding, the other end of the second phase winding is connected with the anode of a seventh switching tube and the anode of a fourth diode, the cathode of an eighth switching tube is connected with the cathode of a fifth diode and one end of a third phase winding, the other end of the third phase winding is connected with the anode of a ninth switching tube and the anode of a sixth diode, the cathode of the sixth diode is connected with the cathode of the second diode, the cathode of the fourth diode, the other end of a first capacitor, one end of a second capacitor and one end of a primary side winding of a first transformer, the other end of the primary side winding of the first transformer is connected with the anode of the seventh diode and one end of a third capacitor, the cathode of the seventh diode is connected with the other end of the second capacitor and one end of the, The other end of the secondary side winding of the first transformer is connected with the anode of a ninth diode;

the first storage battery, the second storage battery, the first switch tube, the second switch tube, the third switch tube and a connecting loop thereof form an excitation power supply of the switched reluctance generator, wherein the anode of the second storage battery, namely the cathode of the first switch tube, is an output anode end of the excitation power supply, and the anode of the second switch tube, namely the cathode of the first storage battery, is an output cathode end of the excitation power supply; the two ends of the first capacitor are the power generation output ends of the switched reluctance generator; the rated voltage of the first storage battery is greater than the rated voltage of the second storage battery; the first transformer transformation ratio is smaller than the second transformer transformation ratio, and the second transformer transformation ratio is smaller than 1.

2. The method for controlling the wide-range excitation power generation and automatic double-charging switched reluctance generator converter system according to claim 1, wherein the excitation power supply can selectively adopt the following three different excitation voltage supply modes according to the requirement of the converter system, wherein the three different excitation voltage supply modes are respectively as follows:

The first mode is as follows: the second switch tube is closed, the first switch tube and the third switch tube are in an off state, the off state is a low-voltage excitation mode, and only the second storage battery supplies power for excitation;

and a second mode: the first switching tube is closed, the second switching tube and the third switching tube are in an off state, the second switching tube and the third switching tube are in a medium-voltage excitation mode, and only the first storage battery supplies power for excitation;

And a third mode: the third switching tube is closed, the first switching tube and the second switching tube are in an off state, the high-voltage excitation strengthening mode is adopted, and the first storage battery and the second storage battery are connected in series to jointly supply power and excite;

when the electric quantity of one of the first storage battery and the second storage battery of the excitation power supply is lower than the lower limit value, the storage battery stops supplying power and excitation, and the other storage battery independently supplies power and excites the other storage battery;

When the switched reluctance generator operates, according to the position information of the rotor of the switched reluctance generator, when the first phase winding needs to be put into operation, the fourth switching tube and the fifth switching tube are closed, an excitation stage is started, and an excitation power supply supplies power to the first phase winding for excitation; when the excitation stage is finished according to the rotor position information, the fifth switching tube is disconnected, the power generation stage is started, when the fourth switching tube is also disconnected at the same time, the voltage reduction power generation output mode is adopted, when the fourth switching tube is continuously kept in a closed state, the voltage boosting power generation output mode is adopted, in addition, the fourth switching tube can also adopt a PWM mode, and the specific adopted mode and the duty ratio of the fourth switching tube in the PWM mode are determined according to the requirement of the power generation output end on the power generation voltage; when the power generation stage is finished according to the rotor position information, the fifth switching tube is disconnected, the fourth switching tube is also in a disconnected state, and when the current of the phase winding is reduced to zero, the power generation stage is that the first phase winding is finished;

When the second phase winding and the third phase winding need to be put into operation according to the rotor position information, the operation control mode is the same as that of the first phase winding, and the specific corresponding relation is as follows: the sixth switching tube and the eighth switching tube correspond to the fourth switching tube, and the seventh switching tube and the ninth switching tube correspond to the fifth switching tube;

When the electric quantity of the first storage battery and the electric quantity of the second storage battery are lower than the lower limit value, the electric energy at the side of the first capacitor is fed back to charge the first storage battery and the second storage battery at the same time, the tenth switching tube adopts a PWM mode, and the duty ratio of the tenth switching tube is determined according to the charging requirements of the first storage battery and the second storage battery and is less than 0.5; and when the electric quantity of at least one storage battery in the first storage battery and the second storage battery is detected to reach the upper limit value, the tenth switching tube is disconnected, and the charging is finished.

Technical Field

the invention relates to the field of switched reluctance motor systems, in particular to a switched reluctance generator current conversion system and a control method thereof, wherein the switched reluctance generator current conversion system automatically and simultaneously charges two excitation storage batteries through wide-range excitation voltage input, wide-range power generation voltage output and single-input double-output.

Background

The switched reluctance motor has simple and firm structure, low cost and high reliability, and has wide application prospect when used as a generator.

when the switched reluctance generator works, before each phase winding generates electric energy, the switched reluctance generator needs to firstly absorb the electric energy to carry out energy storage excitation of the winding of the switched reluctance generator, and the excitation current and the subsequent power generation output capability of the phase winding are greatly influenced by the excitation electric energy, particularly the excitation voltage, so that the variable excitation voltage can be adjusted, and particularly the adaptive surface of the power generation output can be increased; on the other hand, the battery pack is often used as an excitation power source in the industry, the charging problem of the battery pack arises, and especially when the battery pack is multiple and is not grounded, the charging system is challenged, and if the charging system is too much and complicated, the complexity and the cost of the structure and the control of the whole system are increased greatly, and the reliability is reduced.

The switched reluctance generator directly generates direct current, so that the current development requirements of more and more direct current load systems are met, the rectification link is saved, but the generated direct current needs to be converted in most occasions, particularly boost conversion; in addition, when a plurality of electric loads are in operation, the direct current voltage of the input end is often required to be adjusted according to needs so as to meet the operation performance needs of the electric loads, so that a voltage transformation device is bound to be added, and if the output of the switched reluctance generator system similar to a direct current power supply can be adjusted in a large range as required like an adjustable direct current power supply, the switched reluctance generator system has a wide application prospect.

Disclosure of Invention

according to the background technology, the invention provides the switched reluctance generator current transformation system which can provide different excitation voltages in a large range and can output the generated voltage in a large range in an adjustable manner, and realizes the automatic isolation charging of two storage batteries which are not in common with the ground by only one switching tube, and the control method thereof.

The technical scheme of the invention is as follows:

Wide-range excitation power generation and automatic double-charging switched reluctance generator current transformation system is characterized by comprising: the first storage battery is connected with the anode of the first switching tube, the anode of the third switching tube, the cathode of the ninth diode and one end of the fifth capacitor, the first storage battery is connected with the anode of the second switching tube, the anode of the first diode, the anode of the second switching tube, the cathode of the fifth capacitor, the cathode of the first storage battery is connected with the anode of the second switching tube, the first diode, The cathode of the fifth switch tube, the anode of the third diode, the cathode of the seventh switch tube, the anode of the fifth diode, the cathode of the ninth switch tube, one end of the first capacitor, the other end of the fifth capacitor, one end of the secondary side winding of the second transformer, and the cathode of the tenth switch tube, wherein the cathode of the first switch tube is connected with the anode of the second storage battery, the anode of the fourth switch tube, the anode of the sixth switch tube, the anode of the eighth switch tube, the cathode of the eighth diode, one end of the fourth capacitor, the cathode of the third switch tube is connected with the cathode of the second storage battery, the cathode of the second switch tube, the other end of the fourth capacitor, and one end of the secondary side winding of the first transformer, the cathode of the fourth switch tube is connected with the cathode of the first diode and one end of the first phase winding, and the other end of the first phase winding is connected with the anode of the fifth switch tube, the cathode of a sixth switching tube is connected with the cathode of a third diode and one end of a second phase winding, the other end of the second phase winding is connected with the anode of a seventh switching tube and the anode of a fourth diode, the cathode of an eighth switching tube is connected with the cathode of a fifth diode and one end of a third phase winding, the other end of the third phase winding is connected with the anode of a ninth switching tube and the anode of a sixth diode, the cathode of the sixth diode is connected with the cathode of the second diode, the cathode of the fourth diode, the other end of a first capacitor, one end of a second capacitor and one end of a primary side winding of a first transformer, the other end of the primary side winding of the first transformer is connected with the anode of the seventh diode and one end of a third capacitor, the cathode of the seventh diode is connected with the other end of the second capacitor and one end of the, The other end of the secondary side winding of the first transformer is connected with the anode of a ninth diode;

The first storage battery, the second storage battery, the first switch tube, the second switch tube, the third switch tube and a connecting loop thereof form an excitation power supply of the switched reluctance generator, wherein the anode of the second storage battery, namely the cathode of the first switch tube, is an output anode end of the excitation power supply, and the anode of the second switch tube, namely the cathode of the first storage battery, is an output cathode end of the excitation power supply; the two ends of the first capacitor are the power generation output ends of the switched reluctance generator; the rated voltage of the first storage battery is greater than the rated voltage of the second storage battery; the first transformer transformation ratio is smaller than the second transformer transformation ratio, and the second transformer transformation ratio is smaller than 1.

The control method of the wide-range excitation power generation and automatic double-charging switched reluctance generator converter system is characterized in that an excitation power supply can selectively adopt the following three different excitation voltage supply modes according to the requirements of the converter system, wherein the three different excitation voltage supply modes are respectively as follows:

the first mode is as follows: the second switch tube is closed, the first switch tube and the third switch tube are in an off state, the off state is a low-voltage excitation mode, and only the second storage battery supplies power for excitation;

and a second mode: the first switching tube is closed, the second switching tube and the third switching tube are in an off state, the second switching tube and the third switching tube are in a medium-voltage excitation mode, and only the first storage battery supplies power for excitation;

And a third mode: the third switching tube is closed, the first switching tube and the second switching tube are in an off state, the high-voltage excitation strengthening mode is adopted, and the first storage battery and the second storage battery are connected in series to jointly supply power and excite;

When the electric quantity of one of the first storage battery and the second storage battery of the excitation power supply is lower than the lower limit value, the storage battery stops supplying power and excitation, and the other storage battery independently supplies power and excites the other storage battery;

When the switched reluctance generator operates, according to the position information of the rotor of the switched reluctance generator, when the first phase winding needs to be put into operation, the fourth switching tube and the fifth switching tube are closed, an excitation stage is started, and an excitation power supply supplies power to the first phase winding for excitation; when the excitation stage is finished according to the rotor position information, the fifth switching tube is disconnected, the power generation stage is started, when the fourth switching tube is also disconnected at the same time, the voltage reduction power generation output mode is adopted, when the fourth switching tube is continuously kept in a closed state, the voltage boosting power generation output mode is adopted, in addition, the fourth switching tube can also adopt a PWM mode, and the specific adopted mode and the duty ratio of the fourth switching tube in the PWM mode are determined according to the requirement of the power generation output end on the power generation voltage; when the power generation stage is finished according to the rotor position information, the fifth switching tube is disconnected, the fourth switching tube is also in a disconnected state, and when the current of the phase winding is reduced to zero, the power generation stage is that the first phase winding is finished;

When the second phase winding and the third phase winding need to be put into operation according to the rotor position information, the operation control mode is the same as that of the first phase winding, and the specific corresponding relation is as follows: the sixth switching tube and the eighth switching tube correspond to the fourth switching tube, and the seventh switching tube and the ninth switching tube correspond to the fifth switching tube;

when the electric quantity of the first storage battery and the electric quantity of the second storage battery are lower than the lower limit value, the electric energy at the side of the first capacitor is fed back to charge the first storage battery and the second storage battery at the same time, the tenth switching tube adopts a PWM mode, and the duty ratio of the tenth switching tube is determined according to the charging requirements of the first storage battery and the second storage battery and is less than 0.5; and when the electric quantity of at least one storage battery in the first storage battery and the second storage battery is detected to reach the upper limit value, the tenth switching tube is disconnected, and the charging is finished.

The invention has the following main technical effects:

(1) the excitation power supply comprises two storage batteries and three switching tubes, can realize the output of high, medium and low wide-range excitation voltages, greatly adapts to the requirements of the switched reluctance generator on power generation control in a plurality of application occasions, improves the flexibility and expands the application range of the switched reluctance generator.

(2) The phase winding current transformation circuit has a simple structure, can realize wide-range power generation voltage output, can realize boost output or buck output by controlling the two switching tubes in the working process of a certain phase winding, has a wider power generation output voltage range by considering the wide voltage adjustable range of an excitation power supply, can further realize continuous voltage output adjustment by considering the matching of PWM modes of the fourth switching tube (or the sixth switching tube and the eighth switching tube) of each phase winding, and has strong flexibility and adaptability.

(3) when an excitation power supply needs to be charged, only the PWM (pulse width modulation) work of one switching tube (a tenth switching tube) is needed, the charging operation of two storage batteries can be automatically and simultaneously completed, the duty ratio of the tenth switching tube is adjusted, the output of the tenth switching tube, namely the charging electric parameter, can be adjusted, and the two transformers are high-frequency transformers, so that the transformer can participate in voltage transformation on the premise of realizing the function of an isolation link, and the volume, the weight and the cost are lower.

drawings

Fig. 1 is a circuit structure diagram of a wide-range excitation power generation and automatic double-charging switched reluctance generator converter system according to the present invention.

Detailed Description

A circuit structure of the switched reluctance generator converter system of the present embodiment with wide-range excitation power generation and automatic double charging is shown in fig. 1, and the converter system comprises a first battery X1, a second battery X2, a first switch tube V1, a second switch tube V2, a third switch tube V3, a fourth switch tube V4, a fifth switch tube V5, a sixth switch tube V6, a seventh switch tube V7, an eighth switch tube V8, a ninth switch tube V9, a tenth switch tube V10, a first phase winding M, a second phase winding N, a third phase winding P, a first diode D1, a second diode D2, a third diode D3, a fourth diode D4, a fifth diode D847, a sixth diode D6, a seventh diode D7, an eighth diode D7, a ninth diode D7, a first capacitor C7, a second capacitor C7, a third diode D8672, a fifth diode D7, a fifth capacitor C7, a fifth capacitor T7, a fifth capacitor C7, a, The anode of a first storage battery X1 is connected with the anode of a first switching tube V1, the anode of a third switching tube V3, the cathode of a ninth diode D9 and one end of a fifth capacitor C5, the cathode of the first storage battery X1 is connected with the anode of a second switching tube V2, the anode of a first diode D1, the cathode of a fifth switching tube V5, the anode of a third diode D3, the cathode of a seventh switching tube V7, the anode of a fifth diode D5, the cathode of a ninth switching tube V9, one end of a first capacitor C1, the other end of a fifth capacitor C5, the secondary side winding D end of the second transformer T5, and the cathode of a tenth switching tube V5, the cathode of the first switching tube V5 is connected with the anode of the second storage battery X5, the anode of a fourth switching tube V5, the anode of the sixth switching tube V5, the anode of the eighth switching tube D5, the cathode of the fourth switching tube C5, the cathode of the second switching tube V5 and the cathode of the second switching tube V5 are connected with the, The other end of a fourth capacitor C4, one end of a secondary winding b of a first transformer T1, the cathode of a fourth switching tube V4 is connected with the cathode of a first diode D1 and one end of a first phase winding M, the other end of the first phase winding M is connected with the anode of a fifth switching tube V5 and the anode of a second diode D2, the cathode of a sixth switching tube V6 is connected with the cathode of a third diode D3 and one end of a second phase winding N, the other end of the second phase winding N is connected with the anode of a seventh switching tube V7 and the anode of a fourth diode D4, the cathode of an eighth switching tube V8 is connected with the cathode of a fifth diode D5 and one end of a third phase winding P, the other end of the third phase winding P is connected with the anode of a ninth switching tube V9 and the anode of a sixth diode D6, the cathode of the sixth diode D6 is connected with the cathode of a second diode D8 and the cathode of a fourth diode D4, the other end of the first capacitor C1, one, the other end of the primary winding a of the first transformer T1 is connected with the anode of a seventh diode D7 and one end of a third capacitor C3, the cathode of a seventh diode D7 is connected with the other end of a second capacitor C2 and one end of a primary winding C of a second transformer T2, the other end of the primary winding C of the second transformer T2 is connected with the other end of a third capacitor C3 and the anode of a tenth switching tube V10, the other end of the secondary winding b of the first transformer T1 is connected with the anode of an eighth diode D8, and the other end of the secondary winding D of the second transformer T2 is connected with the anode of a ninth diode D36; the primary side winding and the secondary side winding of the first transformer T1 and the second transformer T2 are connected in reverse polarity;

The first storage battery X1, the second storage battery X2, the first switch tube V1, the second switch tube V2, the third switch tube V3 and a connecting loop thereof form an excitation power supply of the switched reluctance generator, wherein the positive pole of the second storage battery X2, namely the cathode of the first switch tube V1, is an output positive pole end of the excitation power supply, and the positive pole of the second switch tube V2, namely the negative pole of the first storage battery X1, is an output negative pole end of the excitation power supply; the two ends of the first capacitor C1 are the power generation output ends of the switched reluctance generator; the rated voltage of the first storage battery X1 is twice that of the second storage battery X2; the transformation ratio of the first transformer T1, namely the b/a turn ratio, is one half of the transformation ratio of the second transformer T2, namely the d/c turn ratio, and the transformation ratio of the second transformer T2 is smaller than 1.

the invention discloses a control method of a wide-range excitation power generation and automatic double-charging switched reluctance generator converter system, wherein an excitation power supply can selectively adopt the following three different excitation voltage supply modes according to the requirements of the converter system, and the three different excitation voltage supply modes are respectively as follows:

the first mode is as follows: the second switch tube V2 is closed, the first switch tube V1 and the third switch tube V3 are in an open state, the low-voltage excitation mode is adopted, and only the second storage battery X2 supplies power for excitation;

and a second mode: the first switch tube V1 is closed, the second switch tube V2 and the third switch tube V3 are in an open state, the open state is a medium-voltage excitation mode, only the first storage battery X1 supplies power for excitation, and the excitation voltage of the closed state is twice of that of the first mode in a rated state;

and a third mode: the third switching tube V3 is closed, the first switching tube V1 and the second switching tube V2 are in an open state, the high-voltage intensified excitation mode is adopted, the first storage battery X1 and the second storage battery X2 are connected in series to supply power and excite together, and the excitation voltage is three times of that of the mode one in a rated state;

the above three modes are selected according to the requirements of the whole power generation system, the excitation voltage requirement is larger when more power generation output is required, but when the first storage battery X1 and the second storage battery X2 of the excitation power supply have the electric quantity of one storage battery lower than the lower limit value, the storage battery stops supplying power and excitation, and the other storage battery separately supplies power and excites.

during the operation of the switched reluctance generator, according to the position information of the rotor of the switched reluctance generator, when the first phase winding M needs to be put into operation, the fourth switch tube V4 and the fifth switch tube V5 are closed, the excitation stage is entered, the excitation power supply supplies power to the first phase winding M for excitation, and the excitation loop is as follows: excitation power supply-V4-M-V5-excitation power supply; when the excitation phase is finished according to the rotor position information, the fifth switch tube V5 is disconnected, the power generation phase is started, and when the fourth switch tube V4 is also disconnected, the power generation loop is in a voltage reduction power generation output mode: M-D2-C1-D1-M, similar to the mode of the traditional BUCK chopper circuit, when the fourth switch tube V4 keeps a closed state continuously, the boost power generation output mode is adopted, and the power generation loop is as follows: M-D2-C1-excitation power supply-V4-M, the voltage at the power generation output end, namely two ends of the first capacitor C1 is the sum of two voltages of the excitation power supply and the first phase winding in series, in addition, the fourth switch tube V4 can also adopt a PWM mode, the specific adopted mode and the duty ratio in the PWM mode of the fourth switch tube V4 are determined according to the requirement of the power generation output end on the power generation voltage, so that the voltage at the power generation output end can be continuously adjusted, can be lower than the voltage of the excitation power supply and can also be higher than the voltage of the excitation power supply, and three selection modes of the excitation power supply are considered, namely the voltage input of the excitation power supply in high, medium and low wide ranges, therefore, the range of the power generation output voltage is extremely wide; when the power generation phase is finished according to the rotor position information, the fifth switch tube V5 is disconnected, the fourth switch tube V4 is also in a disconnected state, the first phase winding M independently bears reverse voltage from the power generation output end at the moment, the inductance of the first phase winding M is in a minimum area at the moment, and the current of the first phase winding M is rapidly reduced to zero under the combined action of the first phase winding M and the second phase winding M according to a switched reluctance generator theoretical model, so that the power generation phase is finished immediately when the first phase winding M works;

when the second phase winding N and the third phase winding P need to be put into operation according to the rotor position information, the operation control mode is the same as that of the first phase winding M, and the specific corresponding relation is as follows: the sixth switching tube V6 and the eighth switching tube V8 correspond to the fourth switching tube V4, the seventh switching tube V7 and the ninth switching tube V9 correspond to the fifth switching tube V5, the third diode D3 and the fifth diode D5 correspond to the first diode D1, and the fourth diode D4 and the sixth diode D6 correspond to the second diode D2.

When the first storage battery X1 and the second storage battery X2 are detected to be lower than the lower limit value, the electric energy feedback at the side of the first capacitor C1 simultaneously charges the first storage battery X1 and the second storage battery X2, and the tenth switching tube V10 adopts a PWM mode, and the duty ratio of the PWM mode depends on the charging requirements of the first storage battery X1 and the second storage battery X2, but is less than 0.5; when the electric quantity of at least one of the first storage battery X1 and the second storage battery X2 reaches the upper limit value, the tenth switch tube V10 is disconnected, and the charging is finished.

Considering that the conversion loops of the windings of all phases are relatively independent and work according to the position information of the rotor of the switched reluctance generator, the invention has strong expandability, namely, the switched reluctance generators of the other phases except the switched reluctance generator of the three-phase winding are naturally protected by the invention.