CN102969716A - Method for controlling active power filter of marine electrical network - Google Patents
Method for controlling active power filter of marine electrical network Download PDFInfo
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- CN102969716A CN102969716A CN2012104161766A CN201210416176A CN102969716A CN 102969716 A CN102969716 A CN 102969716A CN 2012104161766 A CN2012104161766 A CN 2012104161766A CN 201210416176 A CN201210416176 A CN 201210416176A CN 102969716 A CN102969716 A CN 102969716A
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Abstract
The invention discloses a method for controlling active power filter of a marine electrical network. The method comprises steps of collecting current voltage signals of an electric propulsion system, conducting self-adapting trapper and instantaneous reactive theory algorithm operation for the current voltage signals, obtaining real-time fundamental wave signals, subtracting sampled current input signals from the obtained real-time fundamental wave signals, obtaining harmonic signals, subjecting the signals to hysteresis control and space vector pulse width modulation algorithm, obtaining a command signal drive inverse module and obtaining the required opposite phase harmonic current. By the aid of the method, the limiting problem of prior active power filter for the grid frequency range is solved, the direct current voltage use rate is high, the direct current voltage dynamic performance is good, and the application field of the active power filter technology is widened.
Description
Technical field
The present invention relates to a kind of electrical network quality of power supply control field, relate to particularly that a kind of Electrical Propulsion Ship microgrid has minor scale power net, heavy load, close coupling, the load dynamic change is large and the network of ship active power filtering control method of the characteristics such as frequency fluctuation is large.
Background technology
In recent years, along with electronic technology, semiconductor technology, AC speed-regulating theory and Control Technique of Microcomputer develop rapidly, make the speed adjusting performance of alternating current machine can be comparable with the DC motor speed-regulating performance, the converter technique that generally adopts electric propulsion system realizes the rotating speed control to propulsion electric machine, to satisfy the different operating modes of boats and ships to the requirement of the speed of a ship or plane.But, no matter adopt the variable-frequency control technique of which kind of form, the turn-on and turn-off of power switch component cause current fluctuation and mains ripple in conversion process, can make the input side of frequency converter the different current harmonics of degree and voltage harmonic occur with outlet side, become the harmonic pollution source of electric propulsion system.Harmonic wave will cause the control signal wave distortion of the aggravation of power system power supply Quality Down, electric motor overheating, control system to cause the inaccurate even misoperation of control etc., thereby affect the runnability of electric propulsion system, even Capacity Selection and the safety of ship operation of electrical network made a big impact.For this reason, the harmonic wave of watercraft electric propulsion system suppresses to have become electric propulsion system and applies one of key technology that must solve.
Active filter (Active Power Filter, APF) as suppressing harmonic wave, improving a key technology of the electrical network quality of power supply, and can significantly improve stability of power system, be acknowledged as one of effective means that solves problem for power system harmonics.Active Power Filter-APF has obtained increasingly extensive application in advanced industrial countries such as Japan, the U.S., Germany, and application does not at home also reach the stage of ripeness.Development along with semi-conductor industry, the device performance cost ratio improves constantly, and the continuous progress of Digital Signal Processing, active power filtering obtains application more and more at home in the land large electrical network different electric power in recent years, the inventor is in implementing process of the present invention, find that existing land active filter is bad to electrical network parameter dynamic change tracking effect, so that become harmonic source of system.
The Active Power Filter Technology of existing land large electrical network generally adopts based on the changeless control method of mains frequency, has the shortcoming higher to the electrical network parameter stability requirement.And in the boats and ships microgrid, because the installed capacity of Ship Electrical Power System is little, the harmonic wave that the high-power frequency conversion drive unit produces in the electric propulsion system is more serious to the network of ship pollution problem, network of ship voltage and frequency parameter fluctuation are frequent, directly adopt the constant Active Power Filter Technology of land large mains frequency to solve the harmonic problem of network of ship, effect is often not good and may cause full ship dead electricity accident, and the correlation theory of suitable power propelling ship microgrid Active Power Filter Technology and the research of control method is not making a breakthrough property achievement also so far.
Summary of the invention
The object of the present invention is to provide a kind of network of ship active power filtering control method that can effectively solve harmonic pollution problem, the raising minor scale power net quality of power supply and the reliability of watercraft electric propulsion system, to promote the application of electric propulsion system in boats and ships.
For achieving the above object, technical solution of the present invention is: (temporarily slightly)
After adopting such scheme, because the present invention adopts LMP(least mean p-power) adaptive algorithm follows the tracks of trap parameter, in conjunction with the instantaneous reactive power frequency, realizes that the harmonic current of the larger minor scale power net of frequency change detects in real time; Detection capacitance direct voltage and output current in conjunction with PWM Algorithm, have proposed Current Control Strategy.The present invention proposes the active power filtering control method, can be in real time accurate detection of grid frequency, promptly and accurately the compensation harmonic electric current improves the minor scale power net quality of power supply and reliability.
The present invention is further illustrated below in conjunction with the drawings and specific embodiments.
Description of drawings
Fig. 1 is the schematic flow sheet of active power filtering control method provided by the invention;
Fig. 2 is the schematic flow sheet that current harmonics provided by the invention detects in real time;
Fig. 3 is the structural representation that current harmonics provided by the invention detects in real time;
Fig. 4 is that schematic flow sheet is obtained in current harmonics instruction provided by the invention;
Fig. 5 is the schematic flow sheet of output negative-phase sequence curent harmonic wave provided by the invention;
Fig. 6 is the structure chart of inverter output negative-phase sequence curent harmonic wave of the present invention;
Fig. 7 is the frequency-tracking figure that the present invention works as frequency bust adaptive algorithm when being 50Hz;
Fig. 8 is the present invention frequency-tracking figure of adaptive algorithm during by the slope conversion when working as frequency;
Fig. 9 is the current waveform figure of system power supply frequency of the present invention load input terminal when being linear change;
Figure 10 is the current waveform figure of supply frequency of the present invention power end when being linear change;
Figure 11 is the spectrogram of source current harmonic distortion of the present invention.
Embodiment
As shown in Figure 1, the present invention is a kind of network of ship active power filtering control method, and it may further comprise the steps:
1, obtain the real-time harmonic current signal: (1) carries out the computing of adaptive notch filter to the voltage signal that gathers, and obtains the fundamental frequency value; (2) on this fundamental frequency, in conjunction with the feedback of inverter capacitance voltage signal, described collection current signal is carried out the computing of Instantaneous Power Theory algorithm, obtain the fundamental current signal; (3) current signal with this fundamental current signal and collection subtracts each other, and obtains harmonic signal.
2, obtain the harmonic current command signal: (1) compares the real-time harmonic signal of inverter output current signal and gained, revises and also obtains the harmonic wave command signal; (2) the real-time harmonic signal with inverter output current signal and gained subtracts each other, and regulates through PI, revises the real-time harmonic signal, obtains the harmonic wave command signal.
3, obtain required anti-phase harmonic current: (1) is compared the harmonic current command signal with the trigger value of setting, obtains to stagnate to encircle the harmonic current signal of control output, realizes the stagnant ring control of harmonic current, and assurance can not exceed the switching frequency of inversion element; (2) according to the harmonic current signal of the ring control output that stagnates, through spatial vector pulse width modulation algorithm, obtain the driving signal of inversion driver module; (3) according to driving the signal controlling inversion module, obtain required anti-phase harmonic current.
More specifically, as shown in Figure 2.Step 1 of the present invention adopts Direct-type adaptive IIR trapper, the method has two parameters, and wherein β is the trapper frequency parameter, and K is the trapper bandwidth parameter, the two can be regulated separately, comes the variation of Tracking Frequency of Power Grids by regulating trapper frequency parameter β.Its transfer function of second order Direct-type IIR trapper is:
If the sampling time is
, order:
When Z gets when being worth zero point, the frequency response of trapper is zero.Have this moment:
Suppose that input signal is the phase in the three-phase voltage, be made as u (n), output signal is y (n), according to formula (1), can get its difference equation and is:
Adaptive IIR trapper algorithm is based on minimum average B configuration power (LMP) error criterion and decides, and makes the average power error be
, β is desired value when it gets minimum value.When adaptive notch filter was used for estimating mains frequency, the average power error of the algorithm during the average power error ratio p=2 of the algorithm during p=3 was less.Therefore, the adaptive algorithm when design factor β adopts p=3 is regulated, so that the cube average of output signal y (n) is minimum.The length of supposing input signal u (n) is N, and then estimated value is:
So, make coefficient
, adopt steepest descent method to ask β here, with
The point
The direction of directional derivative minimum as the direction of search, then have:
In the following formula,
Be step factor.
Consider the easy of calculating, use here
Instantaneous value replace mean value, then have
According to formula (6), can get again
Therefore factor beta can be calculated by formula (8) and (9), and then according to formula (3), the value ω of frequency can be got.
Detecting mains frequency according to above-mentioned adaptive notch filter, thereby obtain and the synchronous sinusoidal signal of supply voltage and cosine signal, is fundametal compoment after low-pass filtering.Behind LPF, increase pi regulator, form a closed-loop system.After increasing pi regulator, Systems balanth and control precision have been improved.In addition, the existing harmonic signal that obtains after C, C32 conversion has again fundamental signal, and what deliver to pi regulator after LPF filtering mainly is fundamental signal, and it delivers to C, C23 conversion again behind proportional-plus-integral action.
Concrete structure consists of as shown in Figure 3, in the relation of each variable as follows:
The circuit transformation constant is respectively:
In the formula:
,
,
It is the actual current that detects.
Getting at last the harmonic current signal is:
Further, as shown in Figure 4.Step 2 of the present invention is subtracted each other measuring-signal and the current harmonics signal of the inverter output harmonic wave electric current that detects, carrying out proportional integral according to error signal regulates, according to the regulation output value current harmonics signal is revised, realize the regulating error of harmonic current, obtain the harmonic current command signal.
Referring to Fig. 5.In the step 3 of the present invention, produce the logical signal that the power electronic device break-make is controlled according to the instruction current signal that draws above through current tracking control, the electric current that current transformer is sent can the real-Time Compensation harmonic current.Since space vector pulse width modulation (SVPWM) have the direct voltage utilance high, effectively reduced the switching loss of power switch pipe, better characteristics such as dynamic property, the present invention will stagnate, and ring is controlled and SVPWM control organically combines, when obtaining the fast current response, reduce switching frequency, improved running efficiency of system.Specifically, shown in Figure 6 such as modular structure, pass through the wide stagnant chain rate of fixed ring than the unit according to the harmonic current instruction of gained, the corresponding relatively state value of output
,
,
, and pass through command voltage vector
Area judging, finally select logic by space voltage vector, export one suitable
(
=0,1 ... 7), thus make three-phase VSR current tracking instruction current.
Foundation is based on the simulation model of the present invention of Simulink, and the system emulation parameter is set to: power supply is the three-phase sine-wave of standard, line voltage 380V, and set of frequency becomes different situations.Load resistance R=50 Ω, load inductance L=8mH, the coupling reactance of Active Power Filter-APF main circuit and system is 4mH, dc bus capacitor C=470 μ F, given voltage U dc=800V.Nonlinear-load is the load of three-phase diode rectifier band resistance sense, and the power device of main circuit 3-phase power converter is selected IGBT/Diodes.Simulation result such as Fig. 7-shown in Figure 11.
Can measure rapidly and accurately frequency under the different situations by the system that can draw in the oscillogram of Fig. 7 and Fig. 8, within less than 1/4 cycle, just can measure frequency, the well variation of real-time tracking frequency of adaptive notch filter is described.
Simulation result according to Figure 11 to Figure 17, under the different mains frequency conditions, the harmonic current that produces of compensating non-linear load effectively, obviously reduced the resultant distortion rate of network system, the percent harmonic distortion of power end output current is lower than 2.5%, almost having reached sine wave, proved that active power filtering control method of the present invention is effectively in wide frequency domain, is a kind of method that realizes the quality improvement of electric power micro net power quality.
The above, only for preferred embodiment of the present invention, so can not limit scope of the invention process with this, the equivalence of namely doing according to the present patent application claim and description changes and modifies, and all should still belong in the scope that patent of the present invention contains.
Claims (4)
1. network of ship active power filtering control method, it is characterized in that: it may further comprise the steps: (1) obtains the real-time harmonic signal: the current and voltage signals that gathers electric propulsion system, this signal is carried out adaptive notch filter and Instantaneous Power Theory algorithm computing (referring to formula 10), in conjunction with the feedback of inverter capacitance voltage signal, obtain the real-time harmonic signal; (2) obtain the harmonic current command signal: the real-time harmonic current signal of inverter output current signal and gained is compared, revise and also obtain the harmonic current command signal; (3) obtain required anti-phase harmonic current: the harmonic current command signal is through ring control and the spatial vector pulse width modulation algorithm of stagnating, and the drive inversion module of acquisition obtains required anti-phase harmonic current.
2. network of ship active power filtering control method according to claim 1 is characterized in that: step (1) obtains the real-time harmonic signal and may further comprise the steps: (11) carry out the computing of adaptive notch filter to the voltage signal that gathers, and obtain the fundamental frequency value; (12) on this fundamental frequency, in conjunction with the feedback of inverter capacitance voltage signal, described collection current signal is carried out the computing of Instantaneous Power Theory algorithm, obtain the fundamental current signal; (13) current signal with this fundamental current signal and collection subtracts each other, and obtains harmonic signal.
3. network of ship active power filtering control method according to claim 1, it is characterized in that: step (2) obtains the harmonic wave command signal and may further comprise the steps: (21) compare the real-time harmonic signal of inverter output current signal and gained, revise and also obtain the harmonic wave command signal; (22) the real-time harmonic signal with inverter output current signal and gained subtracts each other, and regulates through PI, revises the real-time harmonic signal, obtains the harmonic wave command signal.
4. network of ship active power filtering control method according to claim 1, it is characterized in that: step (3) obtains required anti-phase harmonic current and may further comprise the steps: (31) are compared the harmonic current command signal with the trigger value of setting, the ring that obtains to stagnate is controlled the harmonic current signal of exporting, realize the stagnant ring control of harmonic current, guarantee can not exceed the switching frequency of inversion element; (32) according to the harmonic current signal of the ring control output that stagnates, through spatial vector pulse width modulation algorithm, obtain the driving signal of inversion driver module; (33) according to driving the signal controlling inversion module, obtain required anti-phase harmonic current.
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103474995A (en) * | 2013-09-24 | 2013-12-25 | 江苏省质量安全工程研究院 | Active electric filter and compound control circuit and method of active electric filter |
| CN103683291A (en) * | 2013-12-20 | 2014-03-26 | 深圳市金宏威技术股份有限公司 | Active power filter and current control method thereof |
| CN110535164A (en) * | 2019-09-06 | 2019-12-03 | 集美大学 | A kind of non-capacitive ship DC grid system of DC side |
| CN112595891A (en) * | 2020-09-30 | 2021-04-02 | 国网陕西省电力公司经济技术研究院 | Method for detecting higher harmonics of power system |
| CN113964837A (en) * | 2021-10-09 | 2022-01-21 | 国电南瑞科技股份有限公司 | Composite control method and system suitable for LCL type parallel active power filter |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103474995A (en) * | 2013-09-24 | 2013-12-25 | 江苏省质量安全工程研究院 | Active electric filter and compound control circuit and method of active electric filter |
| CN103683291A (en) * | 2013-12-20 | 2014-03-26 | 深圳市金宏威技术股份有限公司 | Active power filter and current control method thereof |
| CN110535164A (en) * | 2019-09-06 | 2019-12-03 | 集美大学 | A kind of non-capacitive ship DC grid system of DC side |
| CN110535164B (en) * | 2019-09-06 | 2021-06-29 | 集美大学 | Ship direct-current power grid system with no capacitor on direct-current side |
| CN112595891A (en) * | 2020-09-30 | 2021-04-02 | 国网陕西省电力公司经济技术研究院 | Method for detecting higher harmonics of power system |
| CN112595891B (en) * | 2020-09-30 | 2023-12-01 | 国网陕西省电力公司经济技术研究院 | Method for detecting higher harmonic of power system |
| CN113964837A (en) * | 2021-10-09 | 2022-01-21 | 国电南瑞科技股份有限公司 | Composite control method and system suitable for LCL type parallel active power filter |
| CN113964837B (en) * | 2021-10-09 | 2023-12-12 | 北京南瑞数字技术有限公司 | Composite control method and system suitable for LCL type parallel active power filter |
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Application publication date: 20130313 |