CN103337863A - Power factor compensation control method based on static dynamic reactive adjusting device - Google Patents
Power factor compensation control method based on static dynamic reactive adjusting device Download PDFInfo
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- CN103337863A CN103337863A CN 201310279339 CN201310279339A CN103337863A CN 103337863 A CN103337863 A CN 103337863A CN 201310279339 CN201310279339 CN 201310279339 CN 201310279339 A CN201310279339 A CN 201310279339A CN 103337863 A CN103337863 A CN 103337863A
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Abstract
The invention discloses a power factor compensation control method based on a static dynamic reactive adjusting device. The method comprises the steps that an obtained reactive current instruction value serves as an instruction value of a current inner ring Q shaft of the static dynamic reactive adjusting device, and an obtained reactive current value serves as a feedback value of the current inner ring Q shaft of the static dynamic reactive adjusting device. The method has the technical benefits that a power factor control outer ring is reduced, so that control parameters set by a whole system are reduced, debugging of engineering technicians is facilitated, and an application of the method is facilitated; a power factor value is not required to be computed by detecting voltage and current of a power grid, and only voltage at a connection point of the static dynamic reactive adjusting device and output current of a new energy power generation system are required to be detected, so that a voltage detection device can be reduced, and the cost of the system is saved; and the control method is simple, and less in computation quantity, and facilitates engineering practice.
Description
Technical field
The present invention relates to a kind of control method, relate in particular to a kind of power factor compensation control method based on the silent oscillation dynamic reactive-load adjusting device.
Background technology
Therefore there is a large amount of emotional resistances in the renewable energy system such as wind power generation, photovoltaic generation, the power electronic equipment that can carry out the dynamic reactive power adjusting need be installed at the place of being incorporated into the power networks of these systems solves its low power factor problem in being incorporated into the power networks.What present power factor compensation control method based on the silent oscillation dynamic reactive-load adjusting device generally adopted is the power factor closed loop control method, that is: on the basis of original current inner loop decoupling zero control, follow the tracks of the power factor command value constantly by power factor closed-loop control realization bucking-out system power factor, but, in engineering practice, increase pi regulator and can increase variety of problems such as system debug difficulty and algorithm complexity, the Project Realization difficulty is bigger.
Summary of the invention
The object of the present invention is to provide a kind of power factor compensation control method based on the silent oscillation dynamic reactive-load adjusting device, existing control method is improved, simplify control method, reduce the control parameter, the low power factor problem in being incorporated into the power networks with renewable energy systems such as solution wind power generation, photovoltaic generations.
The present invention adopts following technical scheme to realize:
Based on the power factor compensation control method of silent oscillation dynamic reactive-load adjusting device, it is characterized in that this method comprises following each step:
(1) obtains the line voltage of silent oscillation dynamic reactive-load adjusting device and site, be designated as: u
Su, u
Sv, u
Sw, and utilize digital phase-locked loop to calculate line voltage electrical degree _ t and line voltage amplitude V
Sd
(2) obtain silent oscillation dynamic reactive-load adjusting device output current, be designated as: i
u, i
v, i
wAnd the electricity generation system output current, be designated as: i
Su, i
Sv, i
Sw
(3) the line voltage electrical degree that obtains according to step 1 is utilized the 3s/2r coordinate transformation method, with electricity generation system output current i
Su, i
Sv, i
SwBe transformed to active current component and reactive current component, be designated as i respectively
SdAnd i
Sq
(4) the line voltage amplitude V that obtains according to above-mentioned steps 1
SdThe active current component i that obtains with step 3
SdAnd reactive current component i
Sq, utilize formula
With
Obtain active power p and the reactive power q of electricity generation system output respectively;
(5) according to power factor of electric network command value l
*, utilize formula
Obtain the required output reactive power value of silent oscillation dynamic reactive-load adjusting device;
(6) pass through formula
Obtain the command value of the required output reactive current of silent oscillation dynamic reactive-load adjusting device;
(7) the line voltage electrical degree that obtains according to step 1 is utilized the 3s/2r coordinate transformation method, with silent oscillation dynamic reactive-load adjusting device output current i
u, i
v, i
wBe transformed to active current component and reactive current component, be designated as i respectively
dAnd i
q
(8) the referenced reactive current value that step 6 is obtained is as the command value of silent oscillation dynamic reactive-load adjusting device current inner loop Q axle, and the reactive current value that step 7 is obtained is as the value of feedback of silent oscillation dynamic reactive-load adjusting device current inner loop Q axle.
Further, be the line voltage that obtains silent oscillation dynamic reactive-load adjusting device and site by voltage sensor in step (1).
Further, be to obtain silent oscillation dynamic reactive-load adjusting device output current by current sensor in step (2).
The useful technique effect that the present invention possesses is: reduced the power factor controlling outer shroud, the control parameter that makes whole system arrange reduces, and is easy to engineers and technicians' debugging, therefore is conducive to the application of the inventive method; Do not need detection of grid voltage and power network current to come the rated output factor value, only need to detect a silent oscillation dynamic reactive-load adjusting device be incorporated into the power networks point voltage and grid-connected power generation system output current, thereby can reduce by a voltage check device, save system cost; Control method is simple, amount of calculation is few, is conducive to engineering practice.
Description of drawings
Fig. 1 is the detail flowchart that the inventive method is found the solution silent oscillation dynamic reactive-load adjusting device referenced reactive current value.
Fig. 2 is to use the master control block diagram of the high-power chain static type dynamic reactive-load adjusting device of the inventive method.
Fig. 3 uses a system configuration sketch of the present invention.
Fig. 4 is when system shown in Figure 3 is carried out emulation, and utilizing the inventive method control power factor of electric network is 0.9 o'clock simulation waveform figure:
Fig. 4 (a) is the electrical network output power factor;
Fig. 4 (b) is U point voltage and the U power network current mutually that is incorporated into the power networks mutually;
Fig. 4 (c) is U point voltage and the silent oscillation reactive-load adjusting device output U phase current that is incorporated into the power networks mutually;
Fig. 5 is when system shown in Figure 3 is carried out emulation, and utilizing the inventive method control power factor of electric network is 1 o'clock simulation waveform figure:
Fig. 5 (a) is the electrical network output power factor;
Fig. 5 (b) is U point voltage and the U power network current mutually that is incorporated into the power networks mutually;
Fig. 5 (c) is U point voltage and the silent oscillation reactive-load adjusting device output U phase current that is incorporated into the power networks mutually
Embodiment
By following description to embodiment; to help public understanding the present invention more; but can't the specific embodiment that the applicant is given be considered as the restriction to technical solution of the present invention, any definition to parts or technical characterictic change and/or to overall structure do form but not the conversion of essence all should be considered as the protection range that technical scheme of the present invention limits.
Based on the power factor compensation control method of silent oscillation dynamic reactive-load adjusting device, this method comprises following each step:
(1) obtains the line voltage of silent oscillation dynamic reactive-load adjusting device and site, be designated as: u
Su, u
Sv, u
Sw, and utilize digital phase-locked loop to calculate line voltage electrical degree _ t and line voltage amplitude V
Sd
(2) obtain silent oscillation dynamic reactive-load adjusting device output current, be designated as: i
u, i
v, i
wAnd the electricity generation system output current, be designated as: i
Su, i
Sv, i
Sw
(3) the line voltage electrical degree that obtains according to step 1 is utilized the 3s/2r coordinate transformation method, with electricity generation system output current i
Su, i
Sv, i
SwBe transformed to active current component and reactive current component, be designated as i respectively
SdAnd i
Sq
(4) the line voltage amplitude V that obtains according to above-mentioned steps 1
SdThe active current component i that obtains with step 3
SdAnd reactive current component i
Sq, utilize formula
With
Obtain active power p and the reactive power q of electricity generation system output respectively;
(5) according to power factor of electric network command value l
*, utilize formula
Obtain the required output reactive power value of silent oscillation dynamic reactive-load adjusting device;
(6) pass through formula
Obtain the command value of the required output reactive current of silent oscillation dynamic reactive-load adjusting device;
(7) the line voltage electrical degree that obtains according to step 1 is utilized the 3s/2r coordinate transformation method, with silent oscillation dynamic reactive-load adjusting device output current i
u, i
v, i
wBe transformed to active current component and reactive current component, be designated as i respectively
dAnd i
q
(8) the referenced reactive current value that step 6 is obtained is as the command value of silent oscillation dynamic reactive-load adjusting device current inner loop Q axle, and the reactive current value that step 7 is obtained is as the value of feedback of silent oscillation dynamic reactive-load adjusting device current inner loop Q axle.
Step in another embodiment (1) lining obtains the line voltage of silent oscillation dynamic reactive-load adjusting device and site by voltage sensor, and remaining control method step is identical with previous embodiment.
In another embodiment be to obtain silent oscillation dynamic reactive-load adjusting device output current by current sensor in step (2) lining, remaining control method step is identical with first embodiment, and three embodiment among the application can mutually combine and form new embodiment certainly.
Below with among instantiation explanation the present invention based on the power factor compensation control method of silent oscillation dynamic reactive-load adjusting device.In order to test conveniently, be example with system configuration shown in Figure 3, the parameters of system is as shown in the table:
Under the MATLAB simulated environment, on the basis of power decoupled control, the design power Power Factor Controller.The simulation result that obtains is as shown in Figure 4 and Figure 5:
Fig. 4 shows that before silent oscillation dynamic reactive-load adjusting device off-duty, the power factor of electric network value is 0.6; When 0.1s, setting the power factor of electric network value is 0.9, this moment, the silent oscillation dynamic reactive-load adjusting device put into operation, the device output current wave is shown in Fig. 4 (c), the silent oscillation dynamic reactive-load adjusting device provides grid-connected power generation system required lagging reactive power, and this moment, PCC point voltage and power network current waveform were shown in Fig. 4 (b); The power factor of electric network value is 0.9, and the power factor simulation waveform is shown in Fig. 4 (a).
Fig. 5 shows that before silent oscillation dynamic reactive-load adjusting device off-duty, the power factor of electric network value is 0.6; When 0.1s, setting the power factor of electric network value is 1, this moment, the silent oscillation dynamic reactive-load adjusting device put into operation, the device output current wave is shown in Fig. 5 (c), the silent oscillation dynamic reactive-load adjusting device provides grid-connected power generation system required lagging reactive power fully, this moment, PCC point voltage and power network current waveform differed 0 degree, shown in Fig. 5 (b); The power factor of electric network value is 1, and the power factor simulation waveform is shown in Fig. 5 (a).
Certainly; the present invention can also have other various embodiments; under the situation that does not deviate from spirit of the present invention and essence thereof; those of ordinary skill in the art can make various corresponding changes and distortion according to the present invention, but these corresponding changes and distortion all should belong to the protection range of the appended claim of the present invention.
Claims (3)
1. based on the power factor compensation control method of silent oscillation dynamic reactive-load adjusting device, it is characterized in that this method comprises following each step:
(1) obtains the line voltage of silent oscillation dynamic reactive-load adjusting device and site, be designated as: u
Su, u
Sv, u
Sw, and utilize digital phase-locked loop to calculate line voltage electrical degree _ t and line voltage amplitude V
Sd
(2) obtain silent oscillation dynamic reactive-load adjusting device output current, be designated as: i
u, i
v, i
wAnd the electricity generation system output current, be designated as: i
Su, i
Sv, i
Sw
(3) the line voltage electrical degree that obtains according to step 1 is utilized the 3s/2r coordinate transformation method, with electricity generation system output current i
Su, i
Sv, i
SwBe transformed to active current component and reactive current component, be designated as i respectively
SdAnd i
Sq
(4) the line voltage amplitude V that obtains according to above-mentioned steps 1
SdThe active current component i that obtains with step 3
SdAnd reactive current component i
Sq, utilize formula
With
Obtain active power p and the reactive power q of electricity generation system output respectively;
(5) according to power factor of electric network command value l
*, utilize formula
Obtain the required output reactive power value of silent oscillation dynamic reactive-load adjusting device;
(6) pass through formula
Obtain the command value of the required output reactive current of silent oscillation dynamic reactive-load adjusting device;
(7) the line voltage electrical degree that obtains according to step 1 is utilized the 3s/2r coordinate transformation method, with silent oscillation dynamic reactive-load adjusting device output current i
u, i
v, i
wBe transformed to active current component and reactive current component, be designated as i respectively
dAnd i
q
(8) the referenced reactive current value that step 6 is obtained is as the command value of silent oscillation dynamic reactive-load adjusting device current inner loop Q axle, and the reactive current value that step 7 is obtained is as the value of feedback of silent oscillation dynamic reactive-load adjusting device current inner loop Q axle.
2. the power factor compensation control method based on the silent oscillation dynamic reactive-load adjusting device according to claim 1 is characterized in that, is the line voltage that obtains silent oscillation dynamic reactive-load adjusting device and site by voltage sensor in step (1).
3. the power factor compensation control method based on the silent oscillation dynamic reactive-load adjusting device according to claim 1 is characterized in that, is to obtain silent oscillation dynamic reactive-load adjusting device output current by current sensor in step (2).
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104821591A (en) * | 2015-05-14 | 2015-08-05 | 东方日立(成都)电控设备有限公司 | Power factor compensation control method based on static-type dynamic reactive power regulation device |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104821591A (en) * | 2015-05-14 | 2015-08-05 | 东方日立(成都)电控设备有限公司 | Power factor compensation control method based on static-type dynamic reactive power regulation device |
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Application publication date: 20131002 |