TWI312030B - A maximum power point tracking method and device for a wind power generator - Google Patents

Description

1312030 IX. Description of the invention: [Technical field to which the invention pertains] 'The present invention relates to a maximum power tracking method and apparatus for a wind power generation system, and more particularly to the amplitude and observation of an alternating current output current using a constant current/alternating current converter The maximum power of the wind power generation system of a permanent magnet synchronous wind turbine through the change of the DC output voltage of the AC/DC converter to determine the adjustment direction of the next-order AC output current amplitude • Tracking method and device . [Prior Art] In recent years, due to the high development of industry, the use of petrochemical energy has not only led to the rapid depletion of petrochemical energy on the earth, but also caused serious environmental pollution. Based on the perspective of energy multi-environment and environmental protection, the development of renewable energy is The inevitable trend One is that wind energy is one of the important sources of renewable energy. If it can effectively use wind energy, it can not only solve the problem of energy demand, but also reduce environmental pollution and reduce the global greenhouse effect. _ - The wind power generation system drives at least one blade to rotate by the wind, and then rotates - the wind turbine generates electric power, and the electric power generated by the wind power generation system changes the speed of the wind generator, in order to generate electricity from the wind power The maximum power is taken in the system, so the speed of the wind turbine must be controlled to achieve this purpose. The maximum power tracking method and the installation of the conventional wind power generation system, such as US Patent Nos. 6,900, 899 and US 6,608,397 The control of the mechanical device of the wind power generation system is used to control the rotational speed of the wind power generator, thereby obtaining the maximum power wind power generation, and the mechanical device is used to control the rotational speed of the wind power generator, and the Reliability and response speed are not good. In recent years, D:\linda\PK Pat\PKl0iB5.d〇c 06/12/13/11:53 Μ 6 131203Ό 2: Less mechanical use, but use-solid The electric energy conversion system is further configured to: input the alternating current electric energy generated by the wind power generator to the voltage amplitude term, and convert the stable alternating current electric energy into a matching

Electric power system or supply at least - load, and another wind power generation secret maximum power tracking method and device, that is, _ - the output of the wind turbine generator connected to the electric energy conversion - control circuit towel combined maximum identification Longitudinal control to control the speed of the wind machine, the maximum Wei, the maximum power tracking method of the gastric power machine is the disturbance observation method (p- and -_ti〇nmetil〇d), such as the paper "Shi-face anti-medication (4) She Chun (10) 钿wind tu on es, ', IEEE PESC, view 3, let, pp Xie 4 lion it is used - by means of -f can change the age of the control gamma squad light - wind turbine speed ' And measuring the output power of the wind power generator, determining a direction of adjustment of the rotational speed of the wind power generator by the change of the power output of the wind power generator, and repeating the above steps to increase the power output of the wind power generator to achieve maximum Power tracking method and device 'This method must calculate the wheel power and control the speed of the wind generator', so the control circuit is more complicated. In view of the fact that the present invention improves the above disadvantages, it only uses the change one. Power conversion The amplitude of the AC output current of a DC/AC converter, and observe the change of the DC output voltage of the AC/DC converter of the power conversion system. The DC/voltage converter determines the DC/ The direction of the AC current output of the AC converter is adjusted to achieve the maximum power tracking, so the control complexity of the power conversion system can be effectively reduced. [Summary] A 7 D:\Linda\fK PaUPKlOISi doc

06/12/13/11:53 «I 1312030 The main object of the present invention is to provide a maximum power tracking method and apparatus for a wind power generation system, which is connected to a permanent magnet synchronous wind turbine output by control. - an electric energy conversion system for achieving the maximum power tracking of the wind power generation system, the electric energy conversion system comprising an AC/DC converter and a money/AC converter ^, the flow/money converter is connected to the ς water magnetic type Synchronous wind turbine output, the AC/DC conversion crying direct output is connected to the input of the DC/AC converter, and the DC/AC converter AC output is connected to the power distribution system. The maximum power chasing method is to change the amplitude of the AC output current of the DC/AC converter of the electric energy conversion system, and observe the change of the DC output electric castle of the AC/DC conversion hard by the electric energy conversion, by the DC The change of the output power repeatedly determines the direction of the adjustment of the amplitude of the AC output current of the next DC/AC converter, ▲ the amount of change in the DC output voltage of the AC/DC converter, and the DC/parent flow. The AC output current of the device - the same amount of change, the amplitude of the AC output current of the DC / AC converter is adjusted according to the original direction ^, and vice versa, the change of the output of the AC / money transfer surface If the change direction of the AC output current of the DC/AC converter is reversed, the adjustment of the pure magnitude of the DC/AC-varying AC output current is changed. The above steps are repeated in sequence, so the present invention does not need to actually calculate the output power' The purpose of the maximum power tracking of the wind power generation system can be achieved, so that the invention has the effects of reducing the tilting power (10) and controlling the complexity. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS In order to make the other objects, features and advantages of the present invention more obvious, the following is a description of the preferred embodiments of the present invention, and with reference to the drawings, 1312030 is described as follows:风力包丄,,, Figure 1 is not a preferred embodiment of the wind power generation system of the present invention;;; (4) synchronous wind power ray - money / DC converter whip with maximum power chase 2 can be written —_ Distribution System 6. The AC/DC converter of the flow converter"it body diode rectification-DC/straight

调 之 % ϋΓ ϋΓ 112 112 112 112 112 112 112 112 112 112 112 112 112 该 该 该 该 该 该 该 该 该 该 该 该 该 该 该 该 该 该 该 该 该 该 该 该 该 该 该 该 该 该The DC capacitor 3 of the terminal t 2 AC/DC converter 2 is established. The AC/DC converter 2 is proportional to the permanent magnet synchronous wind power generation in the wheel of the energy machine 1 . Gong Si, Pirate 2 conversion produces a continuous flow of power to produce a further feed into the DC / AC converter 4, to the system 6. ^ Output current' to output AC power to the power distribution system. Referring to the 1st maximum power chase: 2: It discloses a control block diagram of the high power tracking h system early 5 of the preferred embodiment of the present invention. The control block of the control unit 5 having the most unit 51 has a current_a multiplier 54 detecting unit 52, a phase locked loop control unit 53, and a moving circuit 57. The controller 55, the controller 56 and the intersection of the pulse width modulation converter 4 are used to extract the DC/AC variable current 1 inv' to generate a current signal. The voltage detection U:\Linda\M! p8t\Wl0ie5.doc 1312030 3 early 疋52 series, used to retrieve the AC system I Vs (1) of the power distribution system, the second letter _ from the generation of the electrical finder unit 5 2 - The voltage signal ^ the pulse voltage signal of the dust detection 52 is sent to the phase locked loop control unit 53 to generate a sinusoidal signal in phase with the voltage of the power distribution system 6. The multiplication = 54 is used to multiply the output signal of the phase-locked loop control unit 53 by an amplitude, κ, of the sigh, DC/AC converter 4 AC output current signal, and a raw-output current reference signal. The subtractor 55 is configured to subtract the current signal outputted from the test unit=51 with the output power of the multiplier 54 and the output of the subtractor 55 is sent to the controller %. A control signal is generated 'finally, the control signal is sent to the pulse width modulation drive circuit 57 to generate the DC/AC converter ϋ 4 power electronic power switch η pulse width modulation signal. The amplitude κ of the AC/AC converter 4 AC current output signal set in Fig. 2 is determined by the flowchart of Fig. 3. έ] Assume that the AC voltage of the power distribution system 6 is vs(t) = Vpsin(Wt) (1, the output current of the DC/AC converter If 4 is controlled to be sinusoidal and is in phase with the AC voltage of the power distribution system 6, That is, iinv(t) = IinvSin(〇t) , _ (2, then the DC/AC converter 4 has a round-out power of

Pinv = 2VplinV (3, and the wind power after the wind energy is converted into a DC voltage by the AC/DC converter 2

Pwind =V- wind

Xlwi, (4) 10 — D:\Lin<Ja\PK Pat'vPKlOlflS. doe

Hfi/12/I3/Il:53 AK 1312030 Assuming that the AC/DC converter 2 has no loss, then p

Inv = Vwin/1 χ J wind X Awind

The variation of Vplinv (5) is not due to the AC accompaniment method of the distribution system 6. It can be regarded as a tilt between a certain scale, because the two amplitude output power is proportional to the DC/AC variable filament 4 In the wheel (5), it can be found that the control of the straight her current = amplitude. = The output power of the wind power generation system can be controlled, and then the amplitude of the heart will be the speed of the motor 2, and changing the permanent magnet type synchronization will affect the transmission of the permanent magnet type wind turbine generator J) Referring to FIG. 1 again, the maximum performance of the present invention is as follows: the order S 5 is completed by a digital signal processor. The maximum power chasing county (4) shirt 5 side take the streamer / DC converter 2 straight output voltage vwind (t), DC / AC converter 4 AC output power M Iinv (t) and power distribution system, The signal of the AC voltage v(8) of the system 6 is input to determine the amplitude K of the AC output current signal in the control unit 5 of the maximum power tracking device. Referring to Figure 3, there is disclosed a method of maximum power tracking in accordance with a preferred embodiment of the present invention. The method includes the following steps: [S11] setting the initial value of the amplitude κ of one of the DC/AC 々丨i_k々丨 “• 4 ac current output signals; [S12] extracting the DC of the AC/DC converter 2 The output voltage is used as an initial value Vwind_u, [S13] provides an output current reference signal of the DC/AC converter 4; [S14] the wind power generation system is referenced to the output current

0^/12/13/11:53 AM 0:\Lifldfi\PK Pat\Pi(l0195.(l« 11 — 1312030

Operation under L - time interval; [S15] feedback of the permanent magnet synchronous wind turbine 1 "mosquito flow / direct replacement m direct recording" pressure reference value Vwindj, the DC output voltage reference value is due to DC / The AC converter 4=outputs the electric age phase; the [can] ratio (4) the DC wheel output voltage changes with respect to one of the initial values of the DC output voltage, and changes the DC/AC in the same direction as the change The vibrating field K of the current output signal of the converter 4, [S17] replaces the initial value of the DC output voltage with the changed DC output voltage reference value; and the repeating step [sn] to [yang] printing and then refer to 3 ® shows the 'fine AC/DC converter, the change of the voltage of the turn-off' to adjust the DC/AC converter 1 to mine: The method of the machine vibration field is described below: Adjust the DC/AC Converter 4 Μ 'Heart 丨,, observe the output voltage of the parent / DC converter 2 f \ 鸠 锐 直流 DC / AC current ^ AC 丨 current 掮 心: the heart of the two permanent magnet synchronization The wind turbine 1 is determined by the AC/DC turn: the change of the wheel current voltage The DC/AC change, turn: the amplitude of the heart output current, the difficult direction, if the amplitude of the DC/AC AC output current is increased, observe the AC/DC turn·*, /吉直 directly If the permanent magnet synchronous wind turbine 1 is turned over by the exchange, crying for 112 output DC cake rises, the job shows the DC/AC change: the change of the flow of the brain is _ large, and vice versa, if the DC / drag the cry 9 After the amplitude of the read-out current is increased, the AC/DC turns to the top of the Wei, and the amplitude of the flow of the parent flow of the DC/AC converter 4 is reversed. D:\LiwIa'PK Pet\PICJOI9S.doc

06/Ι2/13/η:53 AM —12 — 1312030 Please refer to Fig. 3 again, by setting the initial value of the output current amplitude K value of the DC/AC converter 4, and feedback corresponding to the initial The value of the AC / DC converter 2 DC output voltage [proportional to the permanent magnet synchronous generator 1 output voltage] as Vwind-rH, increase the K value and delay for a period of time, so that the wind power system is stable and then read the AC/DC converter 2 output DC voltage

Vwind-n ' is compared with VwincU-Ι to determine the direction of K value change. If Vdncug Vwind_rH, the value of K increases. Otherwise, if the value of K decreases, after the new value of K, 'Save Vwind_n to Vwind_n- 1. Carry out the next sampling and comparison. Please refer to FIG. 3 again. The maximum power tracking method is not limited to setting the initial value amplitude K of the AC output current of the DC/AC converter 4, and the permanent magnet synchronization is fed back at this K value. After the wind turbine has passed the DC output voltage of the AC/DC converter 2, the amplitude of the parent current output current of the DC/AC converter 'V is 4 (ie, the value of K is increased) must be increased; that is, it can also be reduced. The amplitude κ of the AC output current of the DC/AC converter 4 is used to provide the output current reference signal (as shown in FIG. 3, that is, the κ value reduction block is substituted for the κ value increase block), and more importantly, after comparison The permanent magnet synchronous wind power generator 1 is changed in the same direction as the DC output voltage of the AC/DC converter H2 after the DC output voltage of the AC/DC converter 2 is changed with respect to Vwindj i. The amplitude of the preset AC output current κ. In addition, as shown in the first and second figures, the AC first-voltage side unit 52 of the power distribution end of the power system 6 is detected, and a voltage signal is generated to pass through the phase-locked loop control unit 53. A phase-locked loop signal that is in phase with the distribution tank of the power distribution system 6 and is a sine wave is generated, and the amplitude of the phase-locked loop signal and the set DC/AC converter 4 AC output current signal is κ: Linde\m Pat\m〇l95.doc —13 — «/I2/J3/H:S3 1312030 After the fine multiplication of the ^ method & 54, the output of the DC/AC converter 114 is measured. Looking up the value, and then, the current signal generated by the AC output current of the DC/AC converter 4 operated by the current detecting unit 51 is subtracted from the expected value of the output current reference signal by the subtractor 55, and then = control H 56 generates the control money, and sends the control signal to the pulse width modulation drive circuit 57 to generate the pulse width modulation (PWMMs number required by the DC/AC converter 4 to achieve the tracking wind energy). The purpose of maximum power; more importantly, because it is not necessary to actually calculate the output of the wind power system The actual circuit configuration using the maximum power tracking method of the present invention is therefore simpler and more cost effective than conventional techniques. As described above, the maximum power tracking compared to conventional wind power systems. The method and the device must calculate the output power for the maximum power tracking, and have the disadvantages of increasing the control complexity. The present invention adjusts the amplitude of the AC/four current stream 4 by adjusting the DC/parent current converter 4 Check the AC/DC, change the dc output voltage of one of the DC output voltages to determine the amplitude of the AC output current of the DC/AC converter 4 _ the whole direction to achieve the maximum power tracking - the purpose of its The invention can effectively reduce the overall control complexity, and thus the present invention has been developed, and the present invention has been disclosed. It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. The scope of protection of the present invention is defined by the scope of the patent application. D:\UiKb\re ftt\WI0l9S.<k>c —14 — 0r,/»2/l3/U:53 ΑΧ 1312030 [ BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a block diagram of a wind power generation system architecture according to a preferred embodiment of the present invention. FIG. 2 is a block diagram showing the control of a maximum power tracking method and apparatus for a wind power generation system according to a preferred embodiment of the present invention. Figure 3 is a flow chart showing the control of the maximum power tracking method and the maximum power tracking device of the wind power generation system according to the preferred embodiment of the present invention.

[Main component symbol description] AC/DC converter DC/AC converter 1 Permanent magnet synchronous wind turbine 2 3 Energy storage capacitor 4 5 Control unit with maximum power tracking device 6 Power distribution system

51 current detecting unit 53 phase-locked loop control unit 55 subtractor 57 pulse width modulation drive circuit S11 set DC / AC variable current amplitude K initial value 52 voltage detection unit 54 multiplier 56 controller one of the AC wheel current One of the signals S12 draws AC/DC conversion

The DC output voltage of the V is used as the initial value. Wind η-1 S13 provides the output current of the DC/AC converter. The reference number S14 makes the wind power generation season-a temple interval electric signal under the signal P:\ Linde\PK P8t\PK10IS5. doc

06/12/13/11:53 AM —15 — 1312030

S15 feedbacks the DC output voltage reference value of the permanent magnet synchronous wind turbine via the AC/DC converter. Vwind_n S16 compares the DC output voltage reference value with respect to the initial value of the DC output voltage and judges the increase or decrease direction of the K value. Replace the DC output voltage with the changed DC output voltage reference value. O:\Linde\PK Pat\PKI0195.doc —16 — nr</l2/l3/ll:S3 ΛΜ

Claims (1)

131203Ό Ten, the scope of application for patents: _ The largest god tracking device for wind power generation system, which includes: When the wind sends money, its conversion to - exchange: handover ^ (4), money connected to the permanent magnet synchronous wind power = == Saki material tender weaving energy conversion The AC converter is connected to the output of the AC/DC converter, and converts the DC power generated by the AC/DC converter into an AC power output into a power distribution system; and two maximum chases The control unit of the vertical device adopts the amplitude of the AC output current of the DC parent current converter, and observes the amount of change of the DC output voltage of the AC/DC converter to further the DC / exchange 赖 之 之 ώ ώ 叙 叙 叙 叙 叙 叙 叙 叙 叙 叙 叙 叙 叙 叙 叙 叙 叙 叙 叙 叙 叙 叙 该 该 该 该 该 该 该 该 该 该 广 广 广 广 广 广 广 广 广 广 广 广 广 广 广 广The amount of change in the same direction 'adjusts the amplitude of the AC output current of the DC/AC converter according to the original direction; otherwise, the change of the DC output voltage of the AC/money converter is the AC output of the DC/AC red When the magnitude of the change in the amplitude of the current is opposite, the direction of adjustment of the amplitude of the AC output current of the DC/AC converter is changed. 2. According to the application of the special observation section, the maximum power tracking device for power generation secrets, the control unit of the maximum power tracking device is D:\Linda\PK Pat\PKlOieS.doc 06/12 /13/11:53 « —17 — 1312030 A digital processor is used to capture the DC output voltage of the AC/DC converter, the AC output current of the DC/AC converter, and the signal of the parent voltage of the power distribution system. An input is provided to control the DC/AC converter to draw maximum energy from the permanent magnet synchronous wind turbine. °°3, according to the maximum tracking device of the wind power generation system according to item 2 of the patent application scope, the unit (4) of the largest god tracking device has a current detecting unit, a voltage detecting unit, and a phase lock. Loop control unit =, a multiplier, a subtractor, a controller, and a pulse width modulation drive 4, a maximum face chasing device of the wind power generation system according to claim 3, wherein the voltage_unit _ to capture the AC voltage of the distribution system to generate a voltage signal. ', 5, according to the application of the special machine around the third item of the wind-fighting shirt system, the largest vertical f set 'the towel touch phase loop control unit _ capture the voltage generated by the voltage detection unit 彳 ancient number I ink in phase 2. Generate an exchange with the power distribution system. 6. According to the application, the maximum power of the wind-powered shirt system is used. The multiplier is used to rotate the phase-locked circuit to the positive mountain number and the maximum rate. Chasing the amplitude of the output current signal determined by the control unit to generate-output electricity: the maximum power disk of the wind-based shirts in the third item of Hi (4) mu The output current reference signal "port" / the parent current converter AC wheel current signal phase DALinda \ re Pet \ PKI 〇 i9S. (be 1312030 minus, and through the controller to generate a "control variable drive circuit To generate the DC current == one of the electronic power switching elements of the pulse width modulation signal. Force, "species wind:! The maximum power of the electric system", which includes the steps. One amplitude initial value; the recurrent output current signal [b] Draw the DC wheel of the AC/DC converter. The initial value is due to the initial value of the current of the AC current, [c] Provide the wheel of the New Zealand/AC New__4 stream, and (4) make the wind The time interval of the power generation system at the reference value of the wheel current; [e] the feedback value of the DC output voltage of the permanent magnet synchronous wind turbine after the AC/DC converter is returned, and the reference value of the DC output voltage is a rim current reference signal is generated; 8 v [f] Compare the money input iiif pressure reference value to one of the initial values of the DC output voltage, and change the DC/AC converter wheel current reference signal in the same direction as the change; [g] to change The money input voltage reference value replaces the initial value of the DC output voltage; and [h] repeats steps [c] to [g]. '115. —19 — 06/12/13/11:53 Μ