CN103872932B - Net side PWM rectifier - Google Patents
Net side PWM rectifier Download PDFInfo
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- CN103872932B CN103872932B CN201210545485.3A CN201210545485A CN103872932B CN 103872932 B CN103872932 B CN 103872932B CN 201210545485 A CN201210545485 A CN 201210545485A CN 103872932 B CN103872932 B CN 103872932B
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Abstract
The present invention provides a kind of net side PWM rectifier, including：Three phase half controlled bridge recti and controller, the three phase half controlled bridge recti includes three bridge circuits, each bridge circuit includes first triode and second triode, the colelctor electrode of the first triode of three bridge circuits is interconnected, and the emitter stage of the second triode of three bridge circuits is interconnected；The input connection three phase network of the controller, and connect the emitter stage tie point of the second triode of the colelctor electrode tie point and three bridge circuits of the first triode of three bridge circuits, output end connects the base stage of the first triode and the second triode, obtains control voltage signal according to the sampled value and default magnitude of voltage of three phase network and is conveyed to the base stage of the first triode and the second triode.The net side PWM rectifier that the present invention is provided, controls the voltage signal of transistor base in three phase half controlled bridge recti by controller so as to can be suitably used for the unbalanced state of three-phase power grid voltage.
Description
Technical field
The present invention relates to wind generating technology, more particularly to a kind of net side PWM rectifier.
Background technology
Pulse width modulation（Pulse Width Modulation, hereinafter referred to as：PWM）Rectifier can be controlled due to having
The unity power factor of rectification circuit processed, effectively suppresses harmonic wave and realizes the characteristic of energy in bidirectional flow, therefore be commonly applied to
In wind generator system.
The double-fed wind-driven power generation frequency converter that the double-fed wind-driven power generation system commonly used in existing wind generator system is adopted
For back-to-back bi-directional frequency converter, which is mainly made up of the part such as net side PWM rectifier and pusher side PWM rectifier, existing net side
PWM rectifier is applied to the state of three-phase power grid voltage balance, but due to electrical network itself and its some characteristics of additional facilities
Determine that unbalance response often occurs in its electric network state meeting Jing, when three-phase power grid voltage is uneven, to existing net side PWM rectification
Device forms large effect, so as to have influence on normal, the stable operation of whole wind power generation plant.
The content of the invention
The present invention provides a kind of net side PWM rectifier, for solving defect of the prior art, makes the net side PWM rectification
Device can be suitably used for the unbalanced state of three-phase power grid voltage.
The present invention provides a kind of net side PWM rectifier, including：Three phase half controlled bridge recti and controller；
The three phase half controlled bridge recti includes three bridge circuits, and each described bridge circuit includes the one or three pole
Pipe and second triode, the emitter stage of first triode connect the colelctor electrode of second triode and connect three-phase
A phase in electrical network, the colelctor electrode of the first triode of three bridge circuits are interconnected, three bridge circuits
The emitter stage of the second triode is interconnected, the emitter stage and colelctor electrode of each described first triode and second triode
Between connect first diode；
The input of the controller connects the three phase network, and connects the first triode of three bridge circuits
Colelctor electrode tie point and three bridge circuits the second triode emitter stage tie point, output end connection described first
The base stage of triode and second triode, the three-phase voltage sampled value, the three phase network according to the three phase network
The emitter stage of three-phase current sampled value, the colelctor electrode tie point of the first triode of three bridge circuits and the second triode
Voltage sample value and default magnitude of voltage between tie point, carries out positive-negative sequence rotational coordinates regulation, obtains control voltage signal
And it is conveyed to the base stage of first triode and second triode.
A kind of net side PWM rectifier that the present invention is provided, controls triode in three phase half controlled bridge recti by controller
The voltage signal of base stage so that the net side PWM rectifier can be suitably used for the unbalanced state of three-phase power grid voltage.
Description of the drawings
Structural representations of the Fig. 1 for the net side PWM rectifier of the embodiment of the present invention one；
Fig. 2 illustrates for the circuit structure of three phase half controlled bridge recti 11 in the net side PWM rectifier of the embodiment of the present invention two
Figure；
Structural representations of the Fig. 3 for the net side PWM rectifier of the embodiment of the present invention three；
Structural representations of the Fig. 4 for controller 12 in the net side PWM rectifier of the embodiment of the present invention four；
Fig. 5 shows for the structure of the first control unit 121 of controller 12 in the net side PWM rectifier of the embodiment of the present invention five
It is intended to；
Fig. 6 shows for the structure of the second control unit 122 of controller 12 in the net side PWM rectifier of the embodiment of the present invention six
It is intended to；
Fig. 7 shows for the structure of the 3rd control unit 123 of controller 12 in the net side PWM rectifier of the embodiment of the present invention seven
It is intended to；
Structural representations of the Fig. 8 for controller 12 in the net side PWM rectifier of the embodiment of the present invention eight；
Flow charts of the Fig. 9 for the operation method of controller 12 in the net side PWM rectifier of the embodiment of the present invention nine.
Specific embodiment
Structural representations of the Fig. 1 for the net side PWM rectifier of the embodiment of the present invention one.As shown in figure 1, the rectification of net side PWM
Device includes three phase half controlled bridge recti 11 and controller 12, and wherein three phase half controlled bridge recti 11 includes three bridge circuits, often
Individual bridge circuit includes first triode and second triode, and the emitter stage of the first triode connects the second triode
Colelctor electrode and connect the phase in three phase network, the colelctor electrode of the first triode of three bridge circuits is interconnected, three
The emitter stage of the second triode of bridge circuit is interconnected, the emitter stage and current collection of each first triode and the second triode
Connect first diode between pole；The input connection three phase network of controller 12, and connect the of three bridge circuits
The emitter stage tie point of the second triode of the colelctor electrode tie point of one triode and three bridge circuits, output end connection first
The base stage of triode and the second triode, the three-phase current sampling of three-phase voltage sampled value, three phase network according to three phase network
Value, the voltage between the colelctor electrode tie point of the first triode of three bridge circuits and the emitter stage tie point of the second triode
Sampled value and default magnitude of voltage, carry out positive-negative sequence rotational coordinates regulation, obtain control voltage signal and are conveyed to the one or three pole
The base stage of pipe and the second triode.
Using the technical scheme of the present embodiment, triode in three phase half controlled bridge recti 11 can be controlled by controller 12
The voltage signal of base stage so that the net side PWM rectifier can be suitably used for the unbalanced state of three-phase power grid voltage.
Fig. 2 illustrates for the circuit structure of three phase half controlled bridge recti 11 in the net side PWM rectifier of the embodiment of the present invention two
Figure.As shown in Fig. 2 each bridge circuit in three phase half controlled bridge recti 11 is by two insulated gate bipolar transistors
（Insulated Gate Bipolar Transistor, hereinafter referred to as：IGBT）Upper and lower half-bridge is constituted, such as T1-T6 institutes in figure
Show, and each IGBT is connected to an anti-paralleled diode respectively, three-phase bridge is connected with electrical network through Inductor Lg, its
In, three-phase power grid voltage is expressed as Ua, Ub and Uc.In the present embodiment, IGBT chooses rated voltage 1700V, rated current
The transistor unit of 200A.Diode chooses reversely pressure 3000V, the diode element of maximum current 2000A.Inductance Lg chooses
Inductance elements of the L for 0.45mH.Resistance Rg chooses the resistive element that can bear 1MJ power.Additionally, three phase half controlled bridge recti
Circuit also includes the DC link comprising DC bus capacitor C, and electric capacity C is connected between the positive and negative terminal of bus, when double-fed wind
The rated power of power generator is 1.5WM, and line voltage is 690VAC, and when frequency is 50Hz, DC bus capacitor C is designed as
5150uF.Additionally, arrow represents the flow direction of bus current, R in figureLExpression is considered as the pusher side PWM rectifier of DC load.
In the present embodiment, Inductor Lg can filter the harmonic current of AC PWM rectifier so that the rectification of net side PWM
Utensil has Boost type PWM AC/DC characteristics, and can isolate electrical network electromotive force whole with net side PWM to electrical grid transmission reactive power
Stream device AC voltage, by the four quadrant running of the control realization net side PWM rectifier to AC voltage.
DC bus capacitor C energy stable DCs side voltage, the energy swapped by AC and DC side in the present embodiment
Enter row buffering, and suppress DC side harmonics voltage.
Structural representations of the Fig. 3 for the net side PWM rectifier of the embodiment of the present invention three.As shown in figure 3, the rectification of net side PWM
Device includes three phase half controlled bridge recti 11, controller 12 and DC side protection circuit, and the DC side protection circuit includes the 3rd
Triode, inductance, resistance and the second diode, wherein the emitter stage of the 3rd triode connects the one or three pole of three bridge circuits
The colelctor electrode tie point of pipe, one end of the colelctor electrode connection inductance of the 3rd triode and the negative pole of diode, the other end of inductance
One end of connection resistance, the emitter stage of the second triode of the positive pole and three bridge circuits of the other end connection diode of resistance
Tie point.As shown in figure 3, the input connection three phase network of controller 12, and connect the first triode of three bridge circuits
Colelctor electrode tie point and three bridge circuits the second triode emitter stage tie point, output end connect the first triode,
The base stage of the second triode, the three-phase current sampled value of three-phase voltage sampled value, three phase network according to three phase network, three bridges
Voltage sample value between the emitter stage tie point of the colelctor electrode tie point and the second triode of the first triode of formula circuit and
Default magnitude of voltage, carries out positive-negative sequence rotational coordinates regulation, obtains control voltage signal A and is conveyed to the first triode and second
The base stage of triode, control voltage signal A include six voltages for corresponding respectively to first triode and the second triode
Signal A1-A6, to give switching signal of each triode in each controlling cycle, if for example control voltage signal A1 is
Then T1 is opening state to high level, and A1 is that then T1 is off state to low level, and other are similar, and then control the work shape of triode
State.Additionally, another output end of controller is also connected with the base stage of the 3rd triode, according to the first triode of three bridge circuits
Colelctor electrode tie point compare with predetermined threshold value with the voltage sample value between the emitter stage tie point of the second triode, controlled
Signal B processed is simultaneously conveyed to the base stage of the 3rd triode, in a certain controlling cycle, if sampled value is more than threshold value, to control
Signal B is high level, and the DC side protection circuit works, if sampled value is less than threshold value, control signal B is low level, and this is straight
Stream side protection circuit does not work, and then reaches and control the DC side protection circuit according to control signal B in each controlling cycle
Working condition purpose.In the present embodiment, DC side protection circuit inductance is 0.2mH, diode is pressure 1200V, resistance choosing
The power resistor that resistance is 0.25 ohm is selected, predetermined threshold value is set as 1100V.
Using the technical scheme of the present embodiment, 12 sampling three-phase line voltage value of controller, three phase network current value and
DC voltage value output control voltage signal A is conveyed to the base of triode in three phase half controlled bridge recti 11 Jing after processing
Pole so that electrical network positive sequence, negative sequence voltage are calculated in each controlling cycle, for using trapper positive sequence voltage
Extracted with negative sequence voltage, remove positive-negative sequence both sides' reciprocal influence, and negative sequence voltage is compensated, finally calculate IGBT
Carrier frequency is exported to the IGBT ground levels of hardware control, and control net side controller is controlled action, stable busbar voltage, with
Just net side PWM rectifier can be suitably used for the unbalanced state of three-phase power grid voltage in the presence of controller；Meanwhile, controller 12
Control signal B of output is conveyed to the 3rd triode, and it is unnecessary in bus to be consumed in unbalanced source voltage in time
Energy, reduces busbar voltage, keeps DC-side Voltage Stabilization.
Structural representations of the Fig. 4 for controller 12 in the net side PWM rectifier of the embodiment of the present invention four.Controller 12 includes
First control unit 121, the second control unit 122 and the 3rd control unit 123.
First control unit 121, for receiving the three-phase voltage sampled value and the three-phase current of three phase network of three phase network
Sampled value simultaneously carries out positive-negative sequence rotational coordinates regulation according to which, obtains positive sequence feedback current, negative phase-sequence feedback current, positive sequence anti-
Feedthrough voltage value and negative phase-sequence feedback voltage level；
Second control unit 122, for receiving the colelctor electrode tie point and second of the first triode of three bridge circuits
Voltage sample value between the emitter stage tie point of triode simultaneously carries out positive-negative sequence rotational coordinates with default magnitude of voltage according to which
Adjust, obtain the given current value of positive sequence and the given current value of negative phase-sequence；
3rd control unit 123, the first control unit 121 of connection and the second control unit 122, for being fed back according to positive sequence
Current value, negative phase-sequence feedback current, positive sequence give the given current value of current value, negative phase-sequence, positive sequence feedback voltage level and negative phase-sequence feedback
Magnitude of voltage carries out proportion integral control and superposition, obtains target voltage values, carries out pulse width modulation to target voltage values
PWM, obtains control voltage signal.
Using the technical scheme of the present embodiment, the magnitude of voltage and current value of 121 sampling three-phase electrical network of the first control unit are simultaneously
Positive-negative sequence feedback current and positive-negative sequence feedback voltage level, the sampling direct current side bus of the second control unit 122 are obtained Jing after processing
Magnitude of voltage simultaneously obtains the given current value of positive-negative sequence Jing after processing, and the first control unit 121 and second is controlled by the 3rd control unit 123
The acquisition value of unit processed 122 obtains control voltage signal A Jing after processing, and controls the working condition of the triode whereby.This enforcement
The technical scheme of example, on the basis of without external hardware, enters to electrical network positive sequence, negative sequence voltage in each controlling cycle
Row is calculated, and for positive sequence voltage and negative sequence voltage being extracted using trapper, removes positive-negative sequence both sides' reciprocal influence, and
Negative sequence voltage is compensated, IGBT carrier frequencies is finally calculated and is exported to the IGBT ground levels of hardware control, control net side control
Device processed is controlled action, stable busbar voltage so that net side PWM rectifier can be suitably used for three-phase electricity in the presence of controller
The state of net Voltage unbalance.
Fig. 5 shows for the structure of the first control unit 121 of controller 12 in the net side PWM rectifier of the embodiment of the present invention five
It is intended to.As shown in figure 5, the first control unit 121 includes coordinate system transformation device 1211, the first phase convertor 1212 and the first trapper
1213。
Coordinate system transformation device 1211, for receiving the three-phase voltage sampled value and the three-phase current of three phase network of three phase network
Sampled value simultaneously carries out coordinate system transformation respectively to which, and to 1212 output coordinate system transformation results of the first phase convertor；
First phase convertor 1212, connection coordinate system converter 1211 and the first trapper 1213, for coordinate system transformation
The coordinate system transformation result of the output of device 1211 carries out phse conversion, and exports covert result to the first trapper 1213；
First trapper 1213, connects the first phase convertor 1212, for the covert result exported to the first phase convertor 1212
Operation is filtered, positive sequence feedback current, negative phase-sequence feedback current, positive sequence feedback voltage level and negative phase-sequence feedback voltage is obtained
Value.
Fig. 6 shows for the structure of the second control unit 122 of controller 12 in the net side PWM rectifier of the embodiment of the present invention six
It is intended to.As shown in fig. 6, the second control unit 122 includes the first superimposer 1221, the first pi regulator 1222 and the second trapper
1223。
First superimposer 1221, for receiving the colelctor electrode tie point and the two or three of the first triode of three bridge circuits
Voltage sample value between the emitter stage tie point of pole pipe, is overlapped fortune to negative value of the default magnitude of voltage with voltage sample value
Calculate and stack result is exported to the first pi regulator 1222；
First pi regulator 1222, the first superimposer 1221 of connection and the second trapper 1223, for the first superimposer
The stack result of 1221 outputs carries out PI regulations, and adjusts result to the output PI of the second trapper 1223；
Second trapper 1223, connects the first pi regulator 1222, and the PI for exporting to the first pi regulator 1222 is adjusted
Nodule fruit is filtered operation, obtains the given current value of positive sequence and the given current value of negative phase-sequence.
Fig. 7 shows for the structure of the 3rd control unit 123 of controller 12 in the net side PWM rectifier of the embodiment of the present invention seven
It is intended to.As shown in fig. 7, the 3rd control unit 123 includes the second superimposer 1231, the second pi regulator 1232, the 3rd superimposer
1233rd, the 4th superimposer 1234, the second phase convertor 1235, the 5th superimposer 1241, the 3rd pi regulator 1242, the 6th superimposer
1243rd, the 7th superimposer 1244, the 3rd phase convertor 1245, the 8th superimposer 1236 and modulator 1237.
Second superimposer 1231, for receiving the given current value of positive sequence and positive sequence feedback current, to the given electric current of positive sequence
Value is overlapped with the negative value of positive sequence feedback current, and exports positive sequence stack result to the second pi regulator 1232；
Second pi regulator 1232, the second superimposer 1231 of connection, the 3rd superimposer 1233 and the 4th superimposer 1234, uses
PI regulations are carried out in the positive sequence stack result exported to the second superimposer 1231, a PI is obtained and is adjusted result and export to the 3rd
Superimposer 1233, and obtain the 2nd PI regulation results and export to the 4th superimposer 1234；
3rd superimposer 1233 connects the second pi regulator 1232 and the second phase convertor 1235, for decoupling amount and first
PI adjusts the negative value of result and is overlapped, and obtains the first stack result and exports to the second phase convertor 1235；
4th superimposer 1234 connects the second pi regulator 1232 and the second phase convertor 1235, for decoupling amount and second
PI adjusts the negative value of result and is overlapped, and obtains the second stack result and exports to the second phase convertor 1235；
Second phase convertor 1235, the 3rd superimposer 1233 of connection and the 4th superimposer 1234, for the first stack result
Phse conversion is carried out with the second stack result, and to the covert result of the output of the 8th superimposer 1236 positive sequence；
5th superimposer 1241, for receiving the given current value of negative phase-sequence and negative phase-sequence feedback current, to the given electric current of negative phase-sequence
Value is overlapped with the negative value of negative phase-sequence feedback current, and exports negative phase-sequence stack result to the 3rd pi regulator 1242；
3rd pi regulator 1242, the 5th superimposer 1241 of connection, the 6th superimposer 1243 and the 7th superimposer 1244, uses
PI regulations are carried out in the negative phase-sequence stack result exported to the 5th superimposer 1241, the 3rd PI is obtained and is adjusted result and export to the 6th
Superimposer 1243, and obtain the 4th PI regulation results and export to the 7th superimposer 1244；
6th superimposer 1243 connects the 3rd pi regulator 1242 and the 3rd phase convertor 1245, for decoupling amount and the 3rd
PI adjusts the negative value of result and is overlapped, and obtains the 3rd stack result and exports to the 3rd phase convertor 1245；
7th superimposer 1244 connects the 3rd pi regulator 1242 and the 3rd phase convertor 1245, for decoupling amount and the 4th
PI adjusts the negative value of result and is overlapped, and obtains the 4th stack result and exports to the 3rd phase convertor 1245；
3rd phase convertor 1245, the 6th superimposer 1243 of connection and the 7th superimposer 1244, for the 3rd stack result
Phse conversion is carried out with the 4th stack result, and to the covert result of the output of the 8th superimposer 1236 negative phase-sequence；
8th superimposer 1236, the second phase convertor 1235 of connection, the 3rd phase convertor 1245 and modulator 1237, becomes to positive sequence
Phase result is overlapped with the covert result of negative phase-sequence, is obtained target voltage values and is exported to modulator 1237；
Modulator 1237, connects the base stage of the 8th superimposer 1236 and the first triode and the second triode, for the
The target voltage values of the output of eight superimposer 1236 carry out space vector pulse width modulation（SpaceVector Pulse Width
Modulation；Hereinafter referred to as：SVPWM）, acquisition corresponds respectively to control voltage signal A1-A6 of six IGBT and difference is defeated
Give the base stage of the first triode and the second triode.
Additionally, the second superimposer 1231 connects the first control list shown in above-mentioned Fig. 5 in the 3rd control unit 123 shown in Fig. 7
Second trapper 1223 in first trapper 1213 and the second control unit 122 shown in Fig. 6 in unit 121, for falling into first
The positive sequence feedback current of the acquisition of ripple device 1213, positive sequence feedback voltage level, the given electric current of the positive sequence that the second trapper 1223 is obtained
Value carries out computing；In 3rd control unit 123 shown in Fig. 7, the 5th superimposer 1241 connects the first control unit shown in above-mentioned Fig. 5
Second trapper 1223 in first trapper 1213 and the second control unit 122 shown in Fig. 6 in 121, for the first trap
The negative phase-sequence feedback current of the acquisition of device 1213, negative phase-sequence feedback voltage level, the given current value of the negative phase-sequence that the second trapper 1223 is obtained
Carry out computing.
Structural representations of the Fig. 8 for controller 12 in the net side PWM rectifier of the embodiment of the present invention eight；.As shown in figure 8,
U in figuregabcRepresent line voltage value in three-phase static coordinate system（A, b, c）In three-phase voltage value general designation, which is respectively uga、
ugbAnd ugc, igabcRepresent power network current value in three-phase static coordinate system（A, b, c）In three-phase electricity flow valuve general designation, which is respectively
iga, igbAnd igc, ugαβRepresent that three-phase voltage value is transformed to two-phase rest frame（α, β）In two-phase magnitude of voltage general designation, its
Respectively ugαAnd ugβ, igαβRepresent that three-phase electricity flow valuve is transformed to two-phase rest frame（α, β）In two phase electricity flow valuve general designation,
Which is respectively igαAnd igβ, it is above-mentioned to be referred to as Clark conversion from three-phase static coordinate system to the conversion process of two-phase rest frame,
igdqRepresent rest frame（α, β）In two phase electricity flow valuve transform to rotating coordinate system（D, q）In current value general designation, its
Respectively igdAnd igq, the above-mentioned conversion process referred to as Park conversion that rotating coordinate system is tied to from static coordinate, thusRepresent
Rotating coordinate system（D, q）In positive sequence feedback current general designation,Represent rotating coordinate system（D, q）In negative phase-sequence feedback electricity
The general designation of flow valuve,Rotating coordinate system is represented respectively（D, q）In positive sequence feedback voltage level and negative
Sequence feedback voltage level, udcDC side busbar voltage value is represented,Represent preset voltage value,Represent rotating coordinate system（D, q）
In the given current value of positive sequence,Represent rotating coordinate system（D, q）In the given current value of negative phase-sequence,The initial positive-negative sequence magnitude of voltage of PWM rectifier is represented, Represent decoupling amount, wherein Rg、Lg
The respectively total impedance of net side wave filter and total inductance value, ω1For the line voltage angular velocity of rotation of phaselocked loop output.For positive-negative sequence current feedback quantity,To enter
The resistance drop of row feedforward compensation,For positive and negative sequence grid disturbances item,
Represent final PWM rectifier voltage that the initial positive-negative sequence magnitude of voltage of PWM rectifier obtained after adding each self-corresponding decoupling amount to
Definite value.
Flow charts of the Fig. 9 for the operation method of controller 12 in the net side PWM rectifier of the embodiment of the present invention nine.Such as Fig. 9
Shown, the method includes：
Step 91, acquisition electrical network three-phase voltage value, three-phase electricity flow valuve and DC side busbar voltage value.
In this step, the input connection three phase network of controller 12, and then three-phase voltage value u of the electrical network of samplinggabc
With three-phase electricity flow valuve igabc, additionally, the input of controller 12 is also connected with the colelctor electrode of the first triode of three bridge circuits
The emitter stage tie point of the second triode of tie point and three bridge circuits, and then the electrical network main flow side bus voltage value of sampling
udc。
Step 92, electrical network three-phase voltage value, three-phase electricity flow valuve are adjusted through positive-negative sequence rotational coordinates, obtain positive sequence feedback electricity
Flow valuve, negative phase-sequence feedback current, positive sequence feedback voltage level and negative phase-sequence feedback voltage level；DC side busbar voltage value is through positive-negative sequence
Component is adjusted, and obtains the given current value of positive sequence and the given current value of negative phase-sequence.
In this step, on the one hand, electrical network three-phase voltage value u of the sampling of controller 12gabcWith three-phase electricity flow valuve igabcBy lock
Xiang Huan（Phase-Locked Loop；Hereinafter referred to as：PLL）Obtain ω1And θ1, wherein PLL is existing device, can be by emulating system
The running parameter of system model and then acquisition PLL, is then realized the locking of electric network information, for example, magnitude of voltage is entered by parameter adjustment
After row vector, reactive voltage value is less than a certain setting value, that is, think to realize lock phase, and after lock phase, PLL is according to the running parameter
And the electrical network three-phase voltage value and three-phase electricity flow valuve of sampling obtain the ω under the phase locked state1And θ1Value, meanwhile, three-phase voltage
Value ugabcWith three-phase electricity flow valuve igabcCarry out Clarke（Clark）The magnitude of voltage u being converted into after conversion under two-phase rest framegαβ
Current value igαβ, i.e., three-phase voltage current value is transformed to by two-phase magnitude of voltage u by 3/2 convertergαβWith two phase electricity flow valuve igαβ,
The two-phase voltage x current value again passes by Parker（Park）The magnitude of voltage u being transformed to after conversion under two-phase rotating coordinate systemgdqAnd electricity
Flow valuve igdq, i.e., by e-jθ1And ejθ1Two-phase voltage x current value is transformed to two-phase positive-negative sequence voltage x current value by phase convertor, above-mentioned
Important parameter during computing is e-jθ1And ejθ1If, selection parameter e-jθ1Positive sequence voltage value is obtained thenAnd positive sequence current valuesRelative, if selection parameter ejθ1The magnitude of voltage of negative phase-sequence is obtained thenAnd negative sequence current valueAfter phase convertor
Positive-negative sequence voltage x current value respectively by filter the negative phase-sequence in positive sequence voltage current value interference trapper and filter negative phase-sequence electricity
The trapper of the positive sequence interference in piezoelectricity flow valuve is filtered, and obtains positive-negative sequence feedback currentFeed back with positive-negative sequence
Voltage
Trapper in the present embodiment is infinite impulse response digital filter, is very suitable for CF to be eliminated
Arrowband interference and other frequencies are not produced with the occasion of decay.The trapper can filter negative sequence component in positive-sequence coordinate system
The friendship of two times of mains frequencies that the of ac and positive-sequence component of two times of mains frequencies of middle generation is produced in negative phase-sequence coordinate system
Flow, obtains the direct current fundamental frequency in positive and negative sequence coordinate system（Mains frequency）Amount.Implementation method is according to the target frequency to be filtered
The coefficient of LINEAR DIFFERENCE EQUATION WITH CONSTANT COEFFICIENTS is calculated with sample frequency, then is digitized calculating.The constant coefficient linearity difference
Equation is：
Wherein x (n), y (n) are input and output signal sequence, ai、biFor the coefficient of LINEAR DIFFERENCE EQUATION WITH CONSTANT COEFFICIENTS, that is, filter
Ripple device coefficient.In the present embodiment, as, for the interference of the negative phase-sequence in positive sequence voltage current value is filtered, protected frequency is
Mains frequency 50Hz, the frequency for filtering be reversion 50Hz, i.e., relative to the frequency reverse 100Hz interference；It is negative for filtering
In sequence voltage current value for positive sequence interference, protected frequency is the 50Hz with electrical network Vector Rotation velocity reversal, is filtered
To rotate forward 50Hz, i.e., relative to the frequency rotatings forward 100Hz interference, therefore a filtering that can realize above-mentioned purpose of selection
Device.
On the other hand, DC side busbar voltage value u of the sampling of controller 12dcWith predeterminated voltageNegative value through superposition
Device is overlapped computing and obtains a superposition value, wherein, predeterminated voltageGiven by master control system, calculated by control system in outside
After the completion of, net side frequency converter is passed to through communication system.Then the superposition value is tracked control by pi regulator, produces
Watt current set-pointWherein the pi regulator is existing device, by Simulation Model and then can obtain PI regulations
The running parameter of device, then, the voltage superposition value is obtained watt current after the pi regulator of the given running parameter and is given
ValueThe watt current set-point of acquisitionWith System Reactive Power electric current igdThe given current value of positive sequence is obtained after trapperWith the given current value of negative phase-sequenceWherein, System Reactive Power electric current igdCan be obtained by the vector of electric current, trap
It is identical that the selection of device chooses mode with above-mentioned trapper.
Step 93, entered according to above-mentioned positive-negative sequence feedback current, the given current value of positive-negative sequence and positive-negative sequence feedback voltage level
Row PI is adjusted and is superimposed, and obtains target voltage values.
In this step, negative sequence component is aligned while carrying out independent tune with above-mentioned positive-negative sequence current set-point to track target
Section, the two is without coupling.For positive-sequence component, forward-order current set-pointWith forward-order current value of feedbackNegative value it is superimposed
Device be overlapped after Jing pi regulators export PWM rectifier initial positive sequence voltage valueWithWherein the pi regulator is
Existing device, can pass through Simulation Model and then obtain the running parameter of the pi regulator, then, the forward-order current superposition value
Initial positive sequence voltage value is obtained after the pi regulator of the given running parameter, then, initial positive sequence voltage valueNegative value
Corresponding decoupling amountIt is overlapped computing and obtains final PWM rectifier voltage set-pointInitial positive sequence voltage valueThe corresponding decoupling amount of negative valueIt is overlapped computing and obtains final
PWM rectifier voltage set-pointSimultaneously for negative sequence component, negative-sequence current set-pointWith negative-sequence current value of feedbackThe superimposed device of negative value be overlapped after Jing pi regulators export PWM rectifier initial negative sequence voltage valueWithIts
In the pi regulator be existing device, Simulation Model can be passed through and then the running parameter of the pi regulator is obtained, then, should
Negative-sequence current superposition value obtains initial negative sequence voltage value, then, initial negative phase-sequence after the pi regulator of the given running parameter
Magnitude of voltageThe corresponding decoupling amount of negative valueIt is overlapped computing and obtains final PWM rectifications
Device voltage set-pointInitial negative sequence voltage valueThe corresponding decoupling amount of negative valueEnter
Row superposition obtains final PWM rectifier voltage set-pointFinally, above-mentioned voltage set-pointWithJing ej θ 1 become
Value after phase device and above-mentioned voltage set-pointWithJing e-jθ1After phase convertor, value is overlapped computing, obtains target voltage
Value.
Step 94, above-mentioned target voltage is processed, obtain control voltage signal.
In this step, target voltage values correspond respectively to the control voltage of six IGBT through SVPWM modulation treatments, acquisition
Signal A1-A6, the control voltage signal are delivered to the base stage of six IGBT in three phase half controlled bridge recti respectively, and IGBT is according to control
Signal processed is opened and shut-off action, and for example when control signal A1 is high level, T1 is open-minded, T1 shut-offs when A1 is low level,
Other IGBT are similar.
Using the technical scheme of the present embodiment, by the control algolithm in controller, electricity when removing unbalanced source voltage
Impact of the net to PWM rectifier, by the use of trapper, eliminates double-fed wind power generator when line voltage includes negative sequence component
To the two frequency multiplication negative-sequence current components that electrical network is produced, while the harmonic component for filtering negative sequence voltage generation is rushed to PWM rectifier
Hit, protection when realizing unbalanced source voltage to rectifier electric electronic device, and line voltage is solved using trapper
When uneven, positive and negative sequence voltage is difficult to the problem while controlling.
One of ordinary skill in the art will appreciate that：Realize that all or part of step of above-mentioned each method embodiment can be led to
Cross the related hardware of programmed instruction to complete.Aforesaid program can be stored in a computer read/write memory medium.The journey
Sequence upon execution, performs the step of including above-mentioned each method embodiment；And aforesaid storage medium includes：ROM, RAM, magnetic disc or
Person's CD etc. is various can be with the medium of store program codes.
Finally it should be noted that：Various embodiments above only to illustrate technical scheme, rather than a limitation；To the greatest extent
Pipe has been described in detail to the present invention with reference to foregoing embodiments, it will be understood by those within the art that：Its according to
So the technical scheme described in foregoing embodiments can be modified, or which part or all technical characteristic are entered
Row equivalent；And these modifications or replacement, do not make the essence of appropriate technical solution depart from various embodiments of the present invention technology
The scope of scheme.
Claims (4)
1. a kind of net side pulse width modulation (PWM) rectifier, it is characterised in that include：Three phase half controlled bridge recti and controller；
The three phase half controlled bridge recti includes three bridge circuits, each described bridge circuit include first triode and
One the second triode, the emitter stage of first triode connect the colelctor electrode of second triode and connect three phase network
In a phase, the colelctor electrode of the first triode of three bridge circuits interconnects, the second of three bridge circuits
The emitter stage of triode is interconnected, between each described first triode and the emitter stage and colelctor electrode of second triode
One the first diode of connection；
The input of the controller connects the three phase network, and connects the collection of the first triode of three bridge circuits
The emitter stage tie point of the second triode of electrode connection points and three bridge circuits, output end connect the one or three pole
The base stage of pipe and second triode, the three-phase of three-phase voltage sampled value, the three phase network according to the three phase network
Current sampling data, the colelctor electrode tie point of the first triode of three bridge circuits are connected with the emitter stage of the second triode
Voltage sample value and default magnitude of voltage between point, carries out positive-negative sequence rotational coordinates regulation, and acquisition control voltage signal is simultaneously defeated
Give the base stage of first triode and second triode；The controller includes：
First control unit, for receiving the three-phase current of the three-phase voltage sampled value and the three phase network of the three phase network
Sampled value simultaneously carries out positive-negative sequence rotational coordinates regulation according to which, obtains positive sequence feedback current, negative phase-sequence feedback current, positive sequence anti-
Feedthrough voltage value and negative phase-sequence feedback voltage level；
Second control unit, for receiving colelctor electrode tie point and the two or three pole of the first triode of three bridge circuits
Voltage sample value between the emitter stage tie point of pipe simultaneously carries out positive and negative order components regulation according to itself and default magnitude of voltage, obtains
The given current value of positive sequence and the given current value of negative phase-sequence；
3rd control unit, connects first control unit and second control unit, for being fed back according to the positive sequence
Current value, the negative phase-sequence feedback current, positive sequence give current value, negative phase-sequence given current value, positive sequence feedback voltage level and negative phase-sequence
Feedback voltage level carries out proportion integral control and superposition, obtains target voltage values, carries out space arrow to the target voltage values
Amount pulsewidth modulation, obtains the control voltage signal；
Second control unit includes：
First superimposer, for receiving the colelctor electrode tie point and the second triode of the first triode of three bridge circuits
Emitter stage tie point between voltage sample value, fortune is overlapped to negative value of the default magnitude of voltage with the voltage sample value
Calculate and stack result is exported to the first pi regulator；
First pi regulator, connects first superimposer and the second trapper, for exporting to first superimposer
Stack result carry out PI regulations, and adjust result to second trapper output PI；
Second trapper, connects first pi regulator, and the PI for exporting to first pi regulator adjusts knot
Fruit is filtered operation, obtains the given current value of the positive sequence and the given current value of negative phase-sequence；
Each described bridge circuit constitutes upper half-bridge and lower half-bridge by two Insulated Gate Bipolar transistors, and each is described absolutely
Edge Gate Bipolar Transistors connect an anti-paralleled diode respectively, and the three phase half controlled bridge recti is through Inductor
It is connected with the three phase network.
2. net side PWM rectifier according to claim 1, it is characterised in that first control unit includes：
Coordinate system transformation device, for receiving the three-phase current of the three-phase voltage sampled value and the three phase network of the three phase network
Sampled value simultaneously carries out coordinate system transformation respectively to which, and to the first phase convertor output coordinate system transformation results；
First phase convertor, connects the coordinate system transformation device and the first trapper, for defeated to the coordinate system transformation device
The coordinate system transformation result for going out carries out phse conversion, and exports covert result to first trapper；
First trapper, connects first phase convertor, for carrying out to the covert result that first phase convertor is exported
Filtering operation, obtains the positive sequence feedback current, negative phase-sequence feedback current, positive sequence feedback voltage level and negative phase-sequence feedback voltage
Value.
3. net side PWM rectifier according to claim 2, it is characterised in that the 3rd control unit includes：
Second superimposer is for receiving the given current value of the positive sequence and the positive sequence feedback current, given to the positive sequence
Current value is overlapped with the negative value of the positive sequence feedback current, and exports positive sequence stack result to the second pi regulator；
Second pi regulator, connects second superimposer, the 3rd superimposer and the 4th superimposer, for being superimposed to described second
The positive sequence stack result of device output carries out PI regulations, obtains a PI and adjusts result and export to the 3rd superimposer, and obtains
Obtain the 2nd PI to adjust result and export to the 4th superimposer；
3rd superimposer connects the second pi regulator and the second phase convertor, ties for adjusting with a PI to decoupling amount
The negative value of fruit is overlapped, and obtains the first stack result and exports to second phase convertor；
4th superimposer connects the second pi regulator and second phase convertor, for adjusting with the 2nd PI to decoupling amount
The negative value of nodule fruit is overlapped, and obtains the second stack result and exports to second phase convertor；
Second phase convertor, connects the 3rd superimposer and the 4th superimposer, for first stack result
Phse conversion is carried out with second stack result, and to the covert result of the 8th superimposer output positive sequence；
5th superimposer is for receiving the given current value of the negative phase-sequence and the negative phase-sequence feedback current, given to the negative phase-sequence
Current value is overlapped with the negative value of the negative phase-sequence feedback current, and exports negative phase-sequence stack result to the 3rd pi regulator；
3rd pi regulator, connects the 5th superimposer, the 6th superimposer and the 7th superimposer, for being superimposed to the described 5th
The negative phase-sequence stack result of device output carries out PI regulations, obtains the 3rd PI and adjusts result and export to the 6th superimposer, and obtains
Obtain the 4th PI to adjust result and export to the 7th superimposer；
6th superimposer connects the 3rd pi regulator and the 3rd phase convertor, ties for adjusting with the 3rd PI to decoupling amount
The negative value of fruit is overlapped, and obtains the 3rd stack result and exports to the 3rd phase convertor；
7th superimposer connects the 3rd pi regulator and the 3rd phase convertor, for adjusting with the 4th PI to decoupling amount
The negative value of nodule fruit is overlapped, and obtains the 4th stack result and exports to the 3rd phase convertor；
3rd phase convertor, connects the 6th superimposer and the 7th superimposer, for the 3rd stack result
Phse conversion is carried out with the 4th stack result, and to the covert result of the 8th superimposer output negative phase-sequence；
8th superimposer, connects second phase convertor, the 3rd phase convertor and modulator, the positive sequence is in a disguised form tied
Fruit is overlapped with the covert result of the negative phase-sequence, is obtained the target voltage values and is exported to the modulator；
The modulator, connects the base stage of the 8th superimposer and first triode and second triode, is used for
Space vector pulse width modulation is carried out to the target voltage values of the 8th superimposer output, the control voltage signal is obtained and is conveyed to
The base stage of first triode and second triode.
4. the net side PWM rectifier according to any one of claim 1-3, it is characterised in that also include：Three or three pole
Pipe, inductance, resistance and the second diode；
The emitter stage of the 3rd triode connects the colelctor electrode tie point of the first triode of three bridge circuits, described
The colelctor electrode of the 3rd triode connects one end of the inductance and the negative pole of the diode, the other end connection institute of the inductance
One end of resistance is stated, the other end of the resistance connects the two or three pole of the positive pole and three bridge circuits of the diode
The emitter stage tie point of pipe；
The base stage of the 3rd triode connects the controller and is additionally operable to judge the first triode of three bridge circuits
Colelctor electrode tie point and the emitter stage tie point of the second triode between voltage sample value whether exceed predetermined threshold value, if
It is to send high-level control signal to the base stage of the 3rd triode, for making DC side protection circuit work, otherwise, to
The base stage of the 3rd triode sends low level control signal, for making the DC side protection circuit not work.
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| CN106208635A (en) * | 2016-07-20 | 2016-12-07 | 深圳市禾望电气股份有限公司 | Changer parallel control system and method |
| CN107104451B (en) * | 2017-05-03 | 2019-10-15 | 云南电网有限责任公司红河供电局 | A kind of distributed power generation current transformer imbalance suppressing method |
| CN107831364A (en) * | 2017-11-15 | 2018-03-23 | 哈尔滨理工大学 | A kind of electric energy harmonic detecting method |
| CN111371195A (en) * | 2020-03-17 | 2020-07-03 | 江苏方天电力技术有限公司 | Power conversion circuit for LCC-S wireless power transmission system |
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| US8035536B2 (en) * | 2007-11-08 | 2011-10-11 | Delta Electronics, Inc. | Digitally controlled three-phase PFC rectifier |
| CN203233325U (en) * | 2012-12-14 | 2013-10-09 | 华锐风电科技(集团)股份有限公司 | Grid side PWM rectifier |
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| JPH10136674A (en) * | 1996-10-29 | 1998-05-22 | Matsushita Electric Ind Co Ltd | Power circuit of motor control apparatus |
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| US8035536B2 (en) * | 2007-11-08 | 2011-10-11 | Delta Electronics, Inc. | Digitally controlled three-phase PFC rectifier |
| CN203233325U (en) * | 2012-12-14 | 2013-10-09 | 华锐风电科技(集团)股份有限公司 | Grid side PWM rectifier |
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