CN102780443A - Aerial three-level electric excitation motor starting control method and aerial three-level electric excitation motor starting control device - Google Patents

Abstract

The invention relates to an aerial three-level electric excitation motor starting control method and an aerial three-level electric excitation motor starting control device. The method comprises the following steps of: determining the controller output voltage vector in the mode of directly controlling the module value of the voltage vector and an included angle between the voltage vector and a main generator rotor, transmitting a switching signal of a three-phase full-bridge inverter in a mode of modulating a support vector machine (SVM) through a space vector, controlling the inverter to drive the main generator, and realizing the starting function of the three-level electric excitation synchronous motor. The aerial three-level electric excitation motor starting control method has the advantages that 1) the control links are fewer, a speed ring PI regulator and a current ring PI regulator are independent, and the parameters are conveniently adjusted; 2) real-time state information of the system is not required, the acquired original information of the main generator can be processed by using a complicated filtering algorithm, the information has certain robustness on transient interference, and the control performance of the system can be effectively improved; and 3) control objectives are fewer, and the comprehensive control error caused by electromagnetic interference of an exciter on the main generator can be effectively reduced.

Description

Aviation three grades of electric excitation type synchronous motor startings control method and device

Technical field

The present invention relates to the method for starting-controlling and the device of three grades of electric excitation type synchronous machines of a kind of aviation; Be a kind of control method and device that utilizes space vector modulation to realize three grades of electric excitation type synchronous motor startings of aviation function, belong to alternating current machine drive technology field.

Background technology

Starting/generating difunctional integrated be an important development direction of following aviation AC power supply system.At present; In aviation high-power ac power system; Extensively adopt three grades of electric excitation type synchronous machines (theory diagram is seen Fig. 1) as generator, if can use this motor to accomplish the starting of aero-engine, can effectively reduce complexity, weight reduction, the raising reliability of aviation power system.But; This motor is mainly and satisfies the electricity generate function design; When motoring condition, have following problem: 1) static/during lower-speed state; The exciter output voltage is lower, the main generator excitation electric current is less, has a strong impact on the loaded starting ability of main generator, is difficult to adapt to the load characteristic of aero-engine in the big torque of starting process middle and slow speed of revolution; 2) there is stronger electromagnetic coupled between the main generator of three grades of electric excitation type synchronous machines and the exciter; And the non-brushing structure of motor makes its accurate mathematical model under rotation status be difficult to obtain, therefore can't be with the accurate decoupling zero of main generator three-phase current that collects.

At present; The domestic ongoing correlative study work that is directed against three grades of electric excitation type synchronous motor starting control methods; All based on conventional vector control method and direct torque control method, and be mostly simulation study, the part experiment adopts common electric excitation synchronous motor to verify.Simulate the starting process experiment of aero-engine finds through the 2PT115-T/2PT115-P loading bench that adopts three grades of electric excitation type synchronous machines and MAGTROL company; Because there are two problems mentioned above in this motor when motoring condition; No matter be vector control method or direct torque control method; Because the more and accurately decoupling zero of controlled quentity controlled variable all is difficult to reach and controls effect preferably, can't effectively bring into play the load capacity of motor.

Summary of the invention

The technical problem that solves

Weak point for fear of prior art; The present invention proposes a kind of method for starting-controlling and device that is applied to three grades of electric excitation type synchronous machines; Confirm the controller output voltage vector through the mould value of direct control voltage vector and the mode of voltage vector and main generator rotor angle; Send the switching signal of three-phase full-bridge inverter again with the mode of space vector modulation (SVM) generator; Control inverter drives main generator, to realize the method for three grades of electric excitation type synchronous motor starting functions.

Technical scheme

The method for starting-controlling of three grades of electric excitation type synchronous machines of a kind of aviation; It is characterized in that confirming the controller output voltage vector through the mould value of direct control voltage vector and the mode of voltage vector and main generator rotor angle; Send the switching signal of three-phase full-bridge inverter again with the mode of space vector modulation SVM; Control inverter drives main generator, realizes the method for three grades of electric excitation type synchronous motor starting functions; Contain following steps successively:

Step 1: calculate current exciter rotor induced potential, obtain A phase induced potential:

$e_A=N_2{k}_{N_2}{\mathrm{\Φ}}_m({\mathrm{\ω}}_1\sin {\mathrm{\ω}}_{1}t\cos \mathrm{\ωt}+\mathrm{\ω}\cos {\mathrm{\ω}}_{1}t\sin \mathrm{\ωt})$

Wherein: ω ₁=2 π f ₁, f ₁Be the exciter stator excitation frequency; N ₂Be the exciter rotor umber of turn that whenever is in series;

Be winding coefficient; φ _mThe amplitude of the every utmost point magnetic flux that produces for pulsating magnetic potential;

Step 2: calculate the main generator excitation current i _f: i _f=K _UC* e _A/ R _Zr, wherein: K _UCBe the coefficient of correspondence of exciter output voltage and main generator rotor terminal voltage, R _SrBe main generator rotor resistance;

Step 3: the desirable controlled target amount of calculating main generator d shaft current For:

Wherein: I is the main generator line current, M _SfBe the mutual inductance between main generator unit stator, rotor, L _dBe main generator d axle inductance, L _qBe main generator q axle inductance;

Step 4: with the desirable controlled target amount of main generator d shaft current

With actual i _dDifference carry out PI and regulate, obtain voltage vector and main generator rotor d axle clamp angle Δ θ: Δ θ=K _PcE _Id+ K _Ic∫ e _IdDt, wherein: K _PcProportionality coefficient and K for the electric current loop pi regulator _Pc＞0; K _IcIntegral coefficient and K for the electric current loop pi regulator _Ic＞0; $e_{\mathrm{Id}}=i_d^{*}-i_d;$

According to the motor speed reference value of setting

Carry out PI with the difference of motor speed value of feedback ω and regulate, obtain the mould value U:U=K of current modulation voltage vector _PsE _ω+ K _Is∫ e _ωDt; Wherein: K _PsProportionality coefficient and K for the speed ring pi regulator _Ps＞0, K _IsBe the integral coefficient of speed ring pi regulator, and K _Is＞0;

By the position θ of current main generator rotor and the angle Δ θ of voltage vector and main generator rotor d axle, unique establishment mould value is the voltage vector U of U ^*, its position

Step 5: according to space vector modulating method SVM to voltage vector U ^*It is synthetic to carry out vector, obtains the needed threephase switch control signal of inverter.

Described motor speed set-point

Described voltage vector and main generator rotor d axle clamp angle Δ θ satisfy:

A kind of device of realizing the method for starting-controlling of three grades of electric excitation type synchronous machines of said aviation is characterized in that comprising rectification circuit, filter circuit, three-phase full-bridge inverter, single-phase H bridge inverter, central controller, isolated drive circuit, current acquisition circuit and position transducer; Position transducer is connected with three grades of electric excitation type synchronous machines, and position transducer records the rotor position and the rotational speed omega of current main generator; The current acquisition circuit records main generator three-phase current i from the inverter circuit of Alternating Current Power Supply _A, i _B, i _CThe input of rectification circuit connects the three-phase alternating current power supply, and its output connects filter circuit, and the output of filter circuit connects three-phase full-bridge inverter and single-phase H bridge inverter; The output of single-phase H bridge inverter inserts the single-phase winding of stator of exciter; Control three grades of electric excitation type synchronous machines to realize the rotor-exciting of main generator; The three-phase full-bridge inverter output inserts main generator unit stator three phase windings of three grades of electric excitation type synchronous machines; After main generator rotor was realized excitation, the control main generator was realized the electric operation of three grades of electric excitation type synchronous machines.

Beneficial effect

Three grades of electric excitation type synchronous motor starting control methods of the present invention and device; Size through the direct control output voltage vector of speed closed loop pi regulator; Relative position through current closed-loop pi regulator adjustment voltage vector and rotor; The angle of torsion of control main generator is to regulate main generator d shaft current i _dReach the desirable d shaft current under the current rotating speed

This method does not need to control respectively main generator d shaft current i _dAnd q shaft current i _qSet-point, do not need to control respectively d shaft voltage U yet _dAnd q shaft voltage U _qOutput because the minimizing of controlled quentity controlled variable, the component that exciter is coupling in the main generator three-phase current reduces the influence of system control performance, adopts under the prerequisite of identical filtering technique, can obtain better starting control effect.

The present invention has the following advantages: 1) controlling unit is less, and speed ring pi regulator and electric current loop pi regulator are separate, and parameter adjustment is convenient; 2) do not need the real-time status information of system, can adopt comparatively the complicated filter algorithm that the main generator raw information that collects is handled, glitch is had certain robustness, can effectively improve system control performance; 3) the controlled target amount is few, can effectively reduce the Comprehensive Control error that electromagnetic interference caused of exciter to main generator.

Description of drawings

Fig. 1: three grades of electric excitation type synchronous machine theory diagrams

Fig. 2: the inventive method theory diagram

Fig. 3: each vector relations figure during the main generator electric operation

Fig. 4: the vectogram of span voltage vector

Fig. 5: system hardware circuit structure block diagram

Fig. 6: the main generator starting waveform when adopting this control method under the 45Nm stall square situation

Fig. 7: 600 (r/min) when adopting this control method, 70Nm load main generator stable speed operation waveform

Fig. 8: 1200 (r/min) when adopting this control method, 80Nm load main generator stable speed operation waveform

Fig. 9: 2000 (r/min) when adopting this control method, 80Nm load main generator stable speed operation waveform

Embodiment

Combine embodiment, accompanying drawing that the present invention is further described at present:

The control principle block diagram of the inventive method is as shown in Figure 2.Wherein, the speed closed loop controller is with the motor given rotating speed

Carry out the mould value U that PID regulates the back output voltage vector with the difference of actual speed ω ^*Exciter output estimator calculates exciter output voltage and main generator excitation electric current according to the current motor actual speed, in conjunction with the main generator i that records _d, i _qValue calculate the desirable i of current main generator operation ^* _dValue, and with the actual i of itself and main generator _dValue is done the angle that PID regulates back output voltage vector and main generator rotor d axle, realizes the voltage vector location, accomplishes main generator i _dThe adjusting of value; (Space Vector Modulation, SVM) output of method control three-phase full-bridge inverter drives main generator, realizes the loaded starting of three grades of electric excitation type synchronous machines through space vector modulation.

The system hardware structure of the embodiment of the invention is as shown in Figure 5, comprising: rectification circuit, filter circuit, three-phase full-bridge inverter, single-phase H bridge inverter, isolated drive circuit, current acquisition circuit, central controller and man-machine interface circuit.Native system adopts resolver to detect motor speed, constitutes three grades of electric excitation type synchronous motor starting control system.Be checking the inventive method, adopt the 2PT115-T/2PT115-P loading bench simulation aero-engine load of MAGTROL company, utilize three grades of electric excitation type synchronous machines to build verification platform.

The present invention is that a kind of technical characterictic is that it contains following steps successively:

(1), calculates current exciter output voltage and main generator excitation electric current through exciter output estimator, in conjunction with main generator model and the main generator i that records by the speed feedback value of current motor _d, i _qBe worth, calculate the ideal of current main generator electric operation

Value, concrete steps are following:

A) by the exciter model, calculate current exciter rotor induced potential, wherein, A phase induced potential can be expressed as:

$e_A=N_2{k}_{N_2}{\mathrm{\Φ}}_m({\mathrm{\ω}}_1\sin {\mathrm{\ω}}_{1}t\cos \mathrm{\ωt}+\mathrm{\ω}\cos {\mathrm{\ω}}_{1}t\sin \mathrm{\ωt})$

Wherein, ω ₁=2 π f ₁, f ₁Be exciter stator excitation frequency, N ₂Be the exciter rotor umber of turn that whenever is in series,

Be winding coefficient, φ _mThe amplitude of the every utmost point magnetic flux that produces for pulsating magnetic potential;

B) because main generator is realized rotor-exciting through exciter through the rectification of resolver three phase full bridge, so the main generator excitation current i _fCan be expressed as:

i _f＝K _UC*e _A/R _zr

Wherein, K _UCBe the coefficient of correspondence of exciter output voltage and main generator rotor terminal voltage, R _ZrIt is the main rotor resistance of sending out.

C) the desirable controlled target amount

of calculating main generator d shaft current is:

$i_d^{*}=\sqrt{\frac{I^2}{2}+{\left[\frac{M_{\mathrm{sf}}{i}_f}{4(L_d-L_q)}\right]}^2}-\frac{M_{\mathrm{sf}}{i}_f}{4(L_d-L_q)}$

Wherein: I is the main generator line current, M _SfBe the mutual inductance between main generator unit stator, rotor, L _dBe main generator d axle inductance, L _qBe main generator q axle inductance.

(2) with the ideal of main generator

With actual i _dDifference carry out PI and regulate, obtain voltage vector and main generator rotor d axle clamp angle Δ θ, Δ θ=K _PcE _Id+ K _Ic∫ e _IdDt, (K _Pc＞0, K _Ic＞0).Wherein, K _Pc, K _IcBe respectively ratio, the integral coefficient of electric current loop pi regulator,

(3) according to the motor speed reference value of setting

Carry out PI with the difference of motor speed value of feedback ω and regulate, obtain the mould value U:U=K of current modulation voltage vector _PsE _ω+ K _Is∫ e _ωDt (K _Ps＞0, K _Is＞0).Wherein, K _Ps, K _IsBe respectively ratio, the integral coefficient of speed ring pi regulator,

(4), can unique affirmation voltage vector position do in conjunction with the position θ of main generator rotor by the voltage vector and the main generator rotor d axle clamp angle Δ θ of step (2) gained

Voltage vector mould value by step (3) obtains can obtain voltage vector U ^*According to space vector modulating method SVM to voltage vector U ^*It is synthetic to carry out vector, obtains the needed threephase switch control signal of inverter.

Described motor speed set-point

Described voltage vector and main generator rotor d axle clamp angle Δ θ satisfy:

Described according to three grades of electric excitation type synchronous machine self characters and systematic function requirement setting K _Ps, K _IsAnd K _Pc, K _Ic, and satisfy K _Ps＞0, K _Is＞0 and K _Pc＞0, K _Ic＞0.

The concrete steps that specific embodiment comprises are following:

1. record the rotor position and the rotational speed omega of current main generator through position transducer;

2. calculate the current component under the current time main generator rotating coordinate system dq axle:

(2.1). from the inverter circuit of Alternating Current Power Supply, record main generator three-phase current i through the current acquisition circuit _A, i _B, i _C

(2.2). by the component of computes main generator unit stator electric current under static two phase coordinate system α β axles:

$i_{\mathrm{\α}}=\frac{2}{3}[i_A-\frac{1}{2}(i_B+i_C)]$

$i_{\mathrm{\β}}=\frac{\sqrt{3}}{3}(i_B-i_C)$

(2.3). by computes main generator unit stator electric current at the component of rotation under the two phase coordinate system dq axles:

i _q＝-i _αsinθ+i _βcosθ

i _d＝i _αcosθ+i _βsinθ

3. calculate main generator desirable

value through following steps:

(3.1). by the exciter model, calculate current exciter rotor induced potential, wherein, A phase induced potential can be expressed as:

$e_A=N_2{k}_{N_2}{\mathrm{\Φ}}_m({\mathrm{\ω}}_1\sin {\mathrm{\ω}}_{1}t\cos \mathrm{\ωt}+\mathrm{\ω}\cos {\mathrm{\ω}}_{1}t\sin \mathrm{\ωt})$

Wherein, ω ₁=2 π f ₁, f ₁Be exciter stator excitation frequency, N ₂Be the exciter rotor umber of turn that whenever is in series,

Be winding coefficient, φ _mThe amplitude of the every utmost point magnetic flux that produces for the exciter pulsating magnetic potential;

(3.2). because main generator is realized rotor-exciting through exciter through the rectification of resolver three phase full bridge, the therefore main exciting current i that sends out _fBut approximate representation is:

i _f＝K _UC*e _A?/R _zr

Wherein, K _UCBe the coefficient of correspondence of exciter output voltage and main generator rotor terminal voltage, R _ZrIt is the main rotor resistance of sending out.

(3.3). the desirable controlled target amount of calculating main generator d shaft current is:

$i_d^{*}=\sqrt{\frac{I^2}{2}+{\left[\frac{M_{\mathrm{sf}}{i}_f}{4(L_d-L_q)}\right]}^2}-\frac{M_{\mathrm{sf}}{i}_f}{4(L_d-L_q)}$

Wherein: I is the main generator line current, M _SfBe the mutual inductance between main generator unit stator, rotor, L _dBe main generator d axle inductance, L _qBe main generator q axle inductance.

4. implement the electric operation control of main generator through following steps:

(4.1). the adjusting parameter of setting speed ring pi regulator is respectively K _Ps=0.3, K _Is=0.25; Set the adjusting parameter K of electric current loop pi regulator _Pc=0.2, K _Ic=0.15;

(4.2). obtain the mould value U of the output voltage vector of main generator controller by following steps:

(4.2.1). $e_{\mathrm{\ω}}={\mathrm{\ω}}_r^{*}-\mathrm{\ω}$

(4.2.2).U＝K _ps·e _ω+K _is∫e _ωdt

(4.3). obtain voltage vector and main generator rotor d axle clamp angle Δ θ by following steps:

(4.3.1). $e_{\mathrm{id}}=i_d^{*}-i_d$

(4.3.2).Δθ＝K _pc·e _id+K _ic∫e _iddt

(4.4). the voltage vector that draws according to the rotor position of main generator and (4.3) and the relative position Δ θ of main generator rotor draw the position of voltage vector in rest frame

The voltage vector mould value U that obtains in the integrating step (4.2) can unique establishment voltage vector U ^*, by the component of computes voltage vector under static two phase coordinate system α β axles:

(4.5). carry out voltage vector synthetic (Fig. 4) according to space vector modulation (SVM), calculate the needed threephase switch control signal of inverter S _A, S _B, S _C:

(4.5.1). confirm two adjacent basic voltage vectors of synthesized reference stator voltage through

:

The stator voltage vector adopts U in the I sector ₁And U ₂

The stator voltage vector adopts U in the II sector ₂And U ₃

The stator voltage vector adopts U in the III sector ₃And U ₄

The stator voltage vector adopts U in the IV sector ₄And U ₅

The stator voltage vector adopts U in the V sector ₅And U ₆

The stator voltage vector adopts U in the VI sector ₆And U ₁

(4.5.2). adopt by the adjacent effective voltage vector U of computes stator voltage vector _NAnd U _N+1With zero vector U ₇And U ₈The time of effect:

$\left\{\begin{array}{c}{T}_1=\frac{T_s}{2U_{\mathrm{dc}}}(3U_{\mathrm{s\&alpha;}}-\sqrt{3}{U}_{\mathrm{s\&beta;}})\\ T_2=\sqrt{3}\frac{T_s}{U_{\mathrm{dc}}}{U}_{\mathrm{s\&beta;}}\\ {\mathrm{<figure-callout\; id="0"\; label="T"\; filenames="HDA00002006995400021.png,HDA00002006995400041.png"\; state="\{\{state\}\}">T</figure-callout>}}_0=T_s-T_1-T_2\end{array}\right.$

(4.5.3). along with the increase of U, the fundamental voltage amplitude of output voltage is also linear to increase the time T of zero vector effect ₀Reduce gradually, but should satisfy following relational expression:

$\left\{\begin{array}{c}{T}_1+T_2\&le;T_s\\ {\mathrm{<figure-callout\; id="0"\; label="T"\; filenames="HDA00002006995400021.png,HDA00002006995400041.png"\; state="\{\{state\}\}">T</figure-callout>}}_0\&GreaterEqual;0\end{array}\right.$

(4.5.4). confirm inverter threephase switch control signal S according to the time of basic voltage vectors and zero vector and each self-applying _A, S _B, S _C:

Effective voltage vector and the pairing threephase switch signal of zero vector that inverter produces are respectively U _i(S _AS _BS _C): U ₁(100), U ₂(110), U ₃(010), U ₄(011), U ₅(001), U ₆(101) and two no-voltage vector U ₇(000), U ₈(111); A SVM cycle T _sInterior basic voltage vectors U _NAnd U _N+1With zero vector U ₇And U ₈Sequence of operation is following:

U ₇Effect T ₀/ 4 → U _NEffect T _N/ 2 → U _N+1Effect T _N+1/ 2 → U ₈Effect T ₀/ 2 → U _N+1Effect Y _N+1/ 2 → U _NEffect T _N/ 2 → U ₇Effect T ₀/ 4;

(4.6). threephase switch signal S _A, S _B, S _CBehind corresponding isolation and signal processing, amplifying circuit, the action of control three-phase full-bridge inverter drives main generator, realizes the start-up function of three grades of electric excitation type synchronous machines.

Among the embodiment of described a kind of aviation method for starting-controlling; The output of the single-phase H bridge inverter in the hardware system shown in Figure 5 inserts the single-phase winding of stator of three grades of electric excitation type synchronous machines; Realize the rotor-exciting of main generator to control three grades of electric excitation type synchronous machines; The three-phase full-bridge inverter output inserts main generator unit stator three phase windings, and after main generator rotor was realized excitation, the control main generator was realized the electric operation of three grades of electric excitation type synchronous machines.

Fig. 6 to Fig. 9 is motor under the control of hardware system shown in Figure 5; Electric operation experimental waveform under different loads, speed conditions is respectively exciter excitation electric current (by single-phase H bridge inverter control output), main generator A phase current (by three-phase full-bridge inverter control output), the A phase input current of controller and the waveform of busbar voltage from top to bottom among the figure.

Claims (4)

1. the method for starting-controlling of three grades of electric excitation type synchronous machines of an aviation; It is characterized in that confirming the controller output voltage vector through the mould value of direct control voltage vector and the mode of voltage vector and main generator rotor angle; Send the switching signal of three-phase full-bridge inverter again with the mode of space vector modulation SVM; Control inverter drives main generator, realizes the method for three grades of electric excitation type synchronous motor starting functions; Contain following steps successively:

Step 1: calculate current exciter rotor induced potential, obtain A phase induced potential:

$e_A=N_2{k}_{N_2}{\mathrm{\&Phi;}}_m({\mathrm{\&omega;}}_1\sin {\mathrm{\&omega;}}_{1}t\cos \mathrm{\&omega;t}+\mathrm{\&omega;}\cos {\mathrm{\&omega;}}_{1}t\sin \mathrm{\&omega;t})$

Wherein: ω ₁=2 π f ₁, f ₁Be the exciter stator excitation frequency; N ₂Be the exciter rotor umber of turn that whenever is in series;

Be winding coefficient; φ _mThe amplitude of the every utmost point magnetic flux that produces for pulsating magnetic potential;

Step 2: calculate the main generator excitation current i _f: i _f=K _UC* e _A/ R _Zr, wherein: K _UCBe the coefficient of correspondence of exciter output voltage and main generator rotor terminal voltage, R _SrBe main generator rotor resistance;

Step 3: the desirable controlled target amount of calculating main generator d shaft current For:

Wherein: I is the main generator line current, M _SfBe the mutual inductance between main generator unit stator, rotor, L _dBe main generator d axle inductance, L _qBe main generator q axle inductance;

Step 4: with the desirable controlled target amount of main generator d shaft current

With actual i _dDifference carry out PI and regulate, obtain voltage vector and main generator rotor d axle clamp angle Δ θ: Δ θ=K _PcE _Id+ K _Ic∫ e _IdDt, wherein: K _PcProportionality coefficient and K for the electric current loop pi regulator _Pc＞0; K _IcIntegral coefficient and K for the electric current loop pi regulator _Ic＞0; $e_{\mathrm{Id}}=i_d^{*}-i_d;$

According to the motor speed reference value of setting

Carry out PI with the difference of motor speed value of feedback ω and regulate, obtain the mould value U:U=K of current modulation voltage vector _PsE _ω+ K _Is∫ e _ωDt; Wherein: K _PsProportionality coefficient and K for the speed ring pi regulator _Ps＞0, K _IsBe the integral coefficient of speed ring pi regulator, and K _Is＞0;

By the position θ of current main generator rotor and the angle Δ θ of voltage vector and main generator rotor d axle, unique establishment mould value is the voltage vector U of U ^*, its position

Step 5: according to space vector modulating method SVM to voltage vector U ^*It is synthetic to carry out vector, obtains the needed threephase switch control signal of inverter.

2. according to the method for starting-controlling of three grades of electric excitation type synchronous machines of the said aviation of claim 1, it is characterized in that:

Described motor speed set-point

3. according to the method for starting-controlling of three grades of electric excitation type synchronous machines of the said aviation of claim 1, it is characterized in that:

Described voltage vector and main generator rotor d axle clamp angle Δ θ satisfy:

4. a device of realizing the method for starting-controlling of three grades of electric excitation type synchronous machines of each said aviation of claim 1 ~ 3 is characterized in that comprising rectification circuit, filter circuit, three-phase full-bridge inverter, single-phase H bridge inverter, central controller, isolated drive circuit, current acquisition circuit and position transducer; Position transducer is connected with three grades of electric excitation type synchronous machines, and position transducer records the rotor position and the rotational speed omega of current main generator; The current acquisition circuit records main generator three-phase current i from the inverter circuit of Alternating Current Power Supply _A, i _B, i _CThe input of rectification circuit connects the three-phase alternating current power supply, and its output connects filter circuit, and the output of filter circuit connects three-phase full-bridge inverter and single-phase H bridge inverter; The output of single-phase H bridge inverter inserts the single-phase winding of stator of exciter; Control three grades of electric excitation type synchronous machines to realize the rotor-exciting of main generator; The three-phase full-bridge inverter output inserts main generator unit stator three phase windings of three grades of electric excitation type synchronous machines; After main generator rotor was realized excitation, the control main generator was realized the electric operation of three grades of electric excitation type synchronous machines.

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