CN103580055A - Open type grid-connection experiment system of variable-speed constant-frequency double-fed wind power generator unit and open type grid-connection experiment method - Google Patents
Open type grid-connection experiment system of variable-speed constant-frequency double-fed wind power generator unit and open type grid-connection experiment method Download PDFInfo
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Abstract
The invention discloses an open type grid-connection experiment system of a variable-speed constant-frequency double-fed wind power generator unit and an open type grid-connection experiment method. The open type grid-connection experiment system is applied to a power grid. The open type grid-connection experiment system comprises a plurality of fuses, a plurality of contactors, a first voltage and current transducer, a second voltage and current transducer, a grid-side converter, a DC capacitor, a rotor-side converter and a double-fed motor. The open type grid-connection experiment system is characterized by further comprising a voltage adjustable isolation transformer, a DSP/FPGA control system, an encoder and an optical coupling isolation unit. The voltage adjustable transformer is arranged between the power grid and the fuses in series and can be adjusted manually so as to simulate and achieve grid connection of various voltage amplitudes. The DSP/FPGA control system is used for controlling a first set of control signals and a second set of control signals according to sampling signals of the first voltage and current transducer, wherein the first set of control signals and the second set of control signals are required by the grid-side converter and the rotor-side converter and outputted to the grid-side converter and the rotor-side converter. The encoder is connected with the double-fed motor and used for detecting the rotating speed of the rotor side of the double-fed motor. The optical coupling isolation unit is connected between the encoder and an FPGA unit and used for inputting the signals into the FPGA unit after the signals are subjected to filtering processing.
Description
Technical field:
The present invention relates to power electronics control technology field, particularly relate to based on the open grid-connected experimental system of speed-varying frequency constant dual feedback wind power generation unit and method.
Background technology:
Along with the mankind are to the giving more sustained attention of energy scarcity and problem of environmental pollution, the development and utilization of regenerative resource, is particularly just being subject to the great attention of various countries to the exploitation of wind energy.
Under traditional constant-speed and constant-frequency generation mode, generator output frequency depends on the speed of blower fan completely, must be through strict synchronous before generator connecting in parallel with system, also must strict control invariablenes turning speed after grid-connected, and process bad paralysis or the collapse that may cause system.
In variable-speed constant-frequency wind power generation system, between double-fed generator and electric power system, formed " flexibly connecting ", doubly-fed generation machine rotor winding and amplitude, frequency, phase place and phase sequence all adjustable four quadrant convertor are connected, can realize the decoupling zero of generator unit stator active power and reactive power and control, improve the flexibility of electric power system adjusting with Dong ﹑ static stability; Meanwhile, variable-speed constant-frequency wind power generation technology can realize maximal wind-energy and follow the trail of, and has greatly improved energy conversion efficiency, has reduced by wind and has been applied to the mechanical stress on wind energy conversion system.
The wind power plant of China is started late, most of core control equipment all adopts import equipment, take the system integration as main, therefore each colleges and universities, R&D institution are in the urgent need to a set of open grid-connected experimental system of variable speed constant frequency double-fed generator group, in addition, wind energy research for MW class large fan, also needs contrived experiment platform, simulation wind speed operation curve.
Summary of the invention:
For the problems referred to above, the object of the invention is to, open grid-connected experimental system and the method for a set of speed-varying frequency constant dual feedback wind power generation unit are provided, mainly realize following functions: the open two-way three-phase PWM current transformer of design based on 32 high accuracy, high-speed dsp Cell processor and FPGA unit coprocessor, by decoupling zero meritorious to doubly-fed generation machine stator, reactive power, calculate, the electric current of current transformer DC side, pusher side, the two closed-loop controls of voltage, realize the grid-connected control to generator.
In order to realize foregoing invention object, the invention discloses the open grid-connected experimental system of a kind of speed-varying frequency constant dual feedback wind power generation unit, be applied in an electrical network, comprise some fuses and some contactors, first, second voltage current transformer, a net side converter, one DC capacitor, one rotor-side converter and a double-fed generator, is characterized in that, comprising:
The isolating transformer of one pressure-adjustable, series connection is arranged between described electrical network and described fuse and connects, and for manual adjustments, to simulate, realizes the grid-connected of various voltage magnitudes;
One DSP/FPGA control system, according to the sampled signal of described the first voltage current transformer, controls first, second group control signal that outputs to described net side converter and described rotor-side converter needs;
One encoder, is connected with described double feedback electric engine, for detection of the rotating speed of described double fed electric machine rotor side;
One light-coupled isolation unit, is connected between described encoder and described FPGA unit, for signal, carries out inputing to described FPGA unit after filtering processing.
Reasonable, described DSP/FPGA control system further comprises:
One electric current and voltage collecting unit, for gathering voltage, the current signal of described double-fed generator stator side, the voltage signal of described electrical network, the voltage of described current transformer DC side, current signal, the voltage of described current transformer pusher side, current signal, described electric current and voltage collecting unit further comprises an operational amplifier and an AD acquisition chip of series connection, and the input of described operational amplifier is connected with the output of described the first voltage current transformer;
One FPGA unit, is connected with the output of described AD acquisition chip, described light-coupled isolation unit;
One DSP unit, the output that connects described FPGA unit, its first output connects the control end of described net side converter, and described first group of control signal is provided, its the second output connects the control end of described rotor-side converter, and described second group of control signal is provided.
Reasonablely be, described some fuses comprise first, second, third fuse, and described some contactors comprise first, second contactor, wherein, described the first fuse and described the first contactor tandem, be connected between described isolating transformer and described net side transformer; Described the second fuse and described the second contactor tandem, be connected between described second voltage current transformer and described double feedback electric engine; Described the 3rd fuse and the 3rd contactor tandem, be connected between described double feedback electric engine and described electrical network.
The method that the invention also discloses the open grid-connected experimental system of a kind of speed-varying frequency constant dual feedback wind power generation unit, the method comprises:
Step 4, calls the DSP unit decoupling zero of described net side converter and controls, and exports first group of PWM three-phase control signal to described net side converter;
Step 7, calls the described DSP unit decoupling zero of described rotor-side converter and controls, and exports second group of PWM three-phase control signal to described rotor-side converter;
Step 8, the rotor excitation current of linear given described double feedback electric engine is to preset value;
Step 10, by the 3rd contactor described in described DSP unit controls, makes the stator of described double feedback electric engine be connected to described electrical network, realizes and net operation;
Step 11, arranges given reactive power value;
Step 12, according to the rotating speed of described double feedback electric engine, tip speed ratio, carries out maximal wind-energy seizure.
Reasonable, the judgement of described step 9 comprises that whether amplitude, phase place, frequency be identical with desired value.
Whole system of the present invention all adopts open by design, by adopting the distributed control of FPGA unit, DSP unit to realize the synchronization to sampling, control, has improved control precision and stability; By the mode of series connection isolating transformer, realize simulation grid-connected, greatly increased operability, the fail safe to electrical network of experiment; By linear mode, progressively increase exciting current given, the control algolithm that adopts feedforward to combine with PID, has overcome grid-connected impulse current large, easily causes the shortcoming of device damage, has improved stability and the dynamic response of system.
Accompanying drawing explanation
Below, with reference to accompanying drawing, for those skilled in the art, to the detailed description of the inventive method, above and other object of the present invention, feature and advantage will be apparent.
Fig. 1 is the structural representation of native system;
Fig. 2 is the workflow diagram of DSP unit in native system;
Fig. 3 is the DSP unit Uncoupling Control Based schematic diagram of net side converter in native system;
Fig. 4 is the DSP unit Uncoupling Control Based schematic diagram of native system rotor side converter.
Embodiment:
Shown in Figure 1, system of the present invention is mainly comprised of isolating transformer 1, first, second, third fuse 21-23, first, second, third contactor 31-33, the first voltage current transformer 4, net side converter (AC/DC IGBT) 5, DC capacitor 6, rotor-side converter (DC/AC IGBT) 7, second voltage current transformer 8, double-fed generator 9, DSP/FPGA control system 10, encoder 11 and light-coupled isolation unit 12.
First, second voltage current transformer 4 and 8 is respectively used to gather the voltage and current signal of electrical network, double fed electric machine rotor, stator; Encoder 11 is for detection of the rotating speed of double feedback electric engine 9 rotor-side; DSP/FPGA control system 10 is according to the voltage and current signal, the tach signal that gather, produce and control the PWM1/2/3 signal of net side converter 5 and the PWM4/5/6 signal of rotor-side converter 7, with this, control rotor voltage, double feedback electric engine stator side is produced and the alternating voltage of expecting amplitude, phase place, frequency, realize grid-connected.
As experiment research equipment, for preventing in experiment because a variety of causes does not meet grid-connected condition by by mistake grid-connected, and affect grid stability, or in experiment, wish that simulation is grid-connected, in this driver element by the isolating transformer 1 of the pressure-adjustable of connecting between electrical network and fuse 1, in experiment or algorithm research, can pass through the output of manual adjustments isolating transformer 1, simulation realizes the grid-connected of various voltage magnitudes, especially carry out the grid-connected experiment of low-voltage, can meet the demand of grid-connected experiment, algorithm research, improve again the fail safe of experiment.
Further can see, the DSP/FPGA control system 10 in said system comprises electric current and voltage collecting unit 100,101HeDSP unit, FPGA unit 102 forms.
Electric current and voltage station acquisition unit 100 is wherein comprised of operational amplifier 1001 and AD sampling A/D chip 1002.
Main voltage, the current signal that gathers double-fed generator stator side of this collecting unit 100, mains voltage signal, the voltage of current transformer DC side, current signal, the voltage of current transformer pusher side, current signal, all signals export operational amplifier 1001 to after first, second current-voltage transformer 4,8 samplings, then input to AD sampling A/D chip 1002, after the interior sampling holder of chip 1002, synchronized sampling, AD conversion, by FPGA unit 101 parallel buss, export DSP unit 102 to.Encoder 11 inputs to FPGA unit 101 by signal after light-coupled isolation unit 12 carries out filtering processing, also by parallel bus, exports the aggregate-value of A/B phase pulse to DSP unit 102.Although DSP unit 102 possesses AD sampling functions, be serial samples, therefore can not guarantee the synchronism of each road signals collecting, and can parallel control multi-channel A/D acquisition chip 1002 by FPGA unit 101, realize synchronized sampling.
Below in conjunction with aforementioned structure block diagram, the control logic flow process of introducing DSP unit 102 is as follows:
S1: after system powers on, control corresponding relay 31-33 by DSP unit 102, DC capacitor 6 is carried out to precharge;
S2: the no preset value that reaches during judgement electric current capacitance voltage, carries out S3 step if reach;
S3: by DSP unit controls contactor 31, net side converter 5 (AC/DC IGBT) powers on;
S4: call the DSP unit Uncoupling Control Based of net side converter 5, export first group of PWM1/2/3 three-phase control signal;
S5: judge that whether current transformer 5 net side outputs are stable, carry out S6 step if stablized output;
S6: by DSP unit controls contactor 32, make current transformer 8 pusher sides export double fed electric machine rotor to;
S7: call the DSP unit Uncoupling Control Based of rotor-side converter 7, export second group of PWM4/5/6 three-phase control signal;
S8: the rotor excitation current of linear given double feedback electric engine 9 is to preset value;
S9: the stator side output voltage identical with desired value (amplitude, phase place, frequency) that judges double feedback electric engine 9? if identical, carry out S10 step; Difference continues to adjust two groups of PWM outputs;
S10: by DSP unit 102 control contactors 33, make the stator of double feedback electric engine 9 be connected to electrical network, realize and net operation;
S11: given reactive power value is set;
S12: according to the rotating speed of double feedback electric engine 9, tip speed ratio, carry out maximal wind-energy seizure.
In the step S8 of above-mentioned flow process, Linear Excitation Current set-point algorithm is specific as follows:
In unit starting process, if with the given magnetic force electric current of mode of step, will cause system overshoot, overvoltage phenomenon, cause Account Dept stable, in native system, adopt linear mode progressively to increase exciting current given, set up following exciting current to function:
I
r_qust=0.03*t+0.05
In formula, I
r_qustfor the given electric current of excitation, t is control cycle.Given exciting current 0.05 (perunit value) when unit initial launch, each control cycle later, exciting current increases by 0.03 (perunit value), until reach system set-point, with this, overcomes overshoot, overvoltage phenomenon, improves device reliability.
In the step S4 of above-mentioned flow process, the DSP unit Uncoupling Control Based of net side converter 5 is as follows:
Adopt voltage oriented control strategy, d axle is directed to voltage on line side, net side has realized the decoupling zero of active power and reactive power, from electrical network, gathers line voltage U
ga, U
gb, U
gc, power network current I
ga, I
gb, I
gc, after α β/abc conversion, dq/ α β conversion, obtain respectively, from current transformer DC side sampling direct voltage U
dc, the given voltage of DC side that system is inputted and power system reactive power and value of feedback are carried out respectively PID computing, are elimination d, q between centers current coupling and elimination grid disturbances, the ω Li of introducing based on current feedback
qwith ω Li
dvoltage feed-forward control compensation, obtains the control voltage of net side, then after dq/ α β conversion the control signal of controlled PWM1/2/3, drive AC/DC side IGBT.
In the step S7 of above-mentioned flow process, DSP unit 102 Uncoupling Control Baseds of rotor-side converter 7 are as follows:
The rotor current I collecting from pusher side
ra, I
rb, I
rc, the stator voltage U collecting from stator side
sa, U
sb, U
sc, stator current I
sa, I
sb, I
sc, after α β/abc conversion, dq/ α β conversion, obtain respectively I
rq, I
rd, U
sq, U
sd, I
sq, I
sd;
The rotor speed θ collecting from encoder
r, the phase angle θ that collects from stator voltage
1, through integration, decoupling zero, after calculating, obtain △ U respectively
rd, △ U
rq;
By to U
sq, U
sdand I
sq, I
sdpower calculation, obtain the active-power P of stator side feedback
sand reactive power Q
s;
According to the wind speed of blower fan, by maximal wind-energy, catch algorithm and obtain given expectation active power Q
s *, by power network reactive power compensation being obtained to given expectation reactive power P
s *, the expectation that obtains pusher side after PID computing is gained merit, reactive current I
rd *and I
rq *, then compare with actual feedback, after PID computing, feedforward compensation remove the cross-couplings item being caused by back electromotive force, obtain the control voltage U of pusher side
rd *and U
rq *, then after dq/ α β conversion the control signal of controlled PWM4/5/6, drive AC/DC side IGBT.
Before the description to preferred embodiment is provided so that any technical staff in this area can use or utilize the present invention.Various modifications to these embodiment are evident for personnel skilled in the art, and total application of principle described here can not used to creativeness to other embodiment.Thereby the present invention is the embodiment shown in being not limited to here, and should be according to meeting the principle that disclosed and the wide region of new feature here.
Claims (5)
1. the open grid-connected experimental system of speed-varying frequency constant dual feedback wind power generation unit, be applied in an electrical network, comprise some fuses and some contactors, first, second voltage current transformer, one net side converter, a DC capacitor, a rotor-side converter and a double-fed generator, it is characterized in that, comprising:
The isolating transformer of one pressure-adjustable, series connection is arranged between described electrical network and described fuse and connects, and for manual adjustments, to simulate, realizes the grid-connected of various voltage magnitudes;
One DSP/FPGA control system, according to the sampled signal of described the first voltage current transformer, controls first, second group control signal that outputs to described net side converter and described rotor-side converter needs;
One encoder, is connected with described double feedback electric engine, for detection of the rotating speed of described double fed electric machine rotor side;
One light-coupled isolation unit, is connected between described encoder and described FPGA unit, for signal, carries out inputing to described FPGA unit after filtering processing.
2. the open grid-connected experimental system of speed-varying frequency constant dual feedback wind power generation unit according to claim 1, is characterized in that, described DSP/FPGA control system further comprises:
One electric current and voltage collecting unit, for gathering voltage, the current signal of described double-fed generator stator side, the voltage signal of described electrical network, the voltage of described current transformer DC side, current signal, the voltage of described current transformer pusher side, current signal, described electric current and voltage collecting unit further comprises an operational amplifier and an AD acquisition chip of series connection, and the input of described operational amplifier is connected with the output of described the first voltage current transformer;
One FPGA unit, is connected with the output of described AD acquisition chip, described light-coupled isolation unit;
One DSP unit, the output that connects described FPGA unit, its first output connects the control end of described net side converter, and described first group of control signal is provided, its the second output connects the control end of described rotor-side converter, and described second group of control signal is provided.
3. the open grid-connected experimental system of speed-varying frequency constant dual feedback wind power generation unit according to claim 2, is characterized in that,
Described some fuses comprise first, second, third fuse, and described some contactors comprise first, second contactor, and wherein, described the first fuse and described the first contactor tandem, be connected between described isolating transformer and described net side transformer; Described the second fuse and described the second contactor tandem, be connected between described second voltage current transformer and described double feedback electric engine; Described the 3rd fuse and the 3rd contactor tandem, be connected between described double feedback electric engine and described electrical network.
4. application rights requires a method for the open grid-connected experimental system of speed-varying frequency constant dual feedback wind power generation unit described in 3, and the method comprises:
Step 1, after powering on, by first, second, third contactor described in described DSP unit controls, carries out precharge to described DC capacitor;
Step 2, the no preset value that reaches while judging the voltage of described DC capacitor, carries out step 3 if reach, if reach, does not return to step 1;
Step 3, by described DSP unit controls the first contactor, described net side converter powers on;
Step 4, calls the DSP unit decoupling zero of described net side converter and controls, and exports first group of PWM three-phase control signal to described net side converter;
Step 5, judges that whether the net side output of described net side converter is stable, if stablized output, carries out step 6, if the unstable step 4 of returning;
Step 6, by the second contactor described in described DSP unit controls, makes the pusher side of described the second current-voltage transformer export described double fed electric machine rotor to;
Step 7, calls the described DSP unit decoupling zero of described rotor-side converter and controls, and exports second group of PWM three-phase control signal to described rotor-side converter;
Step 8, the rotor excitation current of linear given described double feedback electric engine is to preset value;
Step 9, judges that whether the stator side output voltage of described double feedback electric engine is identical with desired value, if identical, carries out step 10, if difference continues to adjust two groups of PWM three-phase control signals;
Step 10, by the 3rd contactor described in described DSP unit controls, makes the stator of described double feedback electric engine be connected to described electrical network, realizes and net operation;
Step 11, arranges given reactive power value;
Step 12, according to the rotating speed of described double feedback electric engine, tip speed ratio, carries out maximal wind-energy seizure.
5. the method for the open grid-connected experimental system of speed-varying frequency constant dual feedback wind power generation unit according to claim 4, is characterized in that,
The judgement of described step 9 comprises that whether amplitude, phase place, frequency be identical with desired value.
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| CN109030968A (en) * | 2017-06-09 | 2018-12-18 | 中国电力科学研究院 | A kind of energy-storage system and off-network test macro and method |
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Application publication date: 20140212 |