CN102594157B - Signal acquisition device and processing method for alternating current power current-sharing output system - Google Patents
Signal acquisition device and processing method for alternating current power current-sharing output system Download PDFInfo
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Abstract
The invention discloses a signal acquisition device and a signal processing method for an alternating current power current-sharing output system, and belongs to the field of alternating current power current-sharing output. The signal acquisition device performs current and voltage acquisition on each single-phase power supply of an alternating current power supply and a current-sharing power supply to obtain accurate signals, so that the current-sharing control accuracy of a microprocessor for the current-sharing power supply is improved. By the signal processing method, the amplitude, frequency and phase of each single-phase power supply in the alternating current power supply and the current-sharing power supply can be accurately detected, so that the current-sharing control accuracy of the microprocessor for the alternating current power supply is further improved, and a load is prevented from being burnt down.
Description
Technical field
The present invention relates to alternating current power current-sharing output system, especially a kind of signal pickup assembly of alternating current power current-sharing output system and processing method thereof.
Background technology
In field of power, alternating current power current-sharing output system refers to provides power supply by an AC power to a plurality of loads, if now AC power is not carried out to accurate sharing control, may cause that to offer the electric current of a load or a plurality of loads excessive, thereby cause load to be burnt.
As shown in Figure 1, traditional alternating current power current-sharing output system is comprised of the first current sample module, the second current sample module, the first voltage sample module, second voltage sampling module and microprocessor conventionally, and wherein the first current sample module, the first voltage sample module are respectively used to gather electric current and the voltage of AC power and send to microprocessor; Microprocessor is used for this AC power to carry out sharing control, and exports N current-sharing power supply; The second current sample module, second voltage sampling module are respectively used to gather electric current and the voltage of corresponding current-sharing power supply and send to microprocessor.As can be seen here, traditional alternating current power current-sharing output system only carries out whole-sample to AC power and current-sharing power supply, makes microprocessor lower to the current sharing control accuracy of AC power.
In addition, microprocessor only carries out simple filtering processing to the electric current of the electric current of AC power, voltage and each current-sharing power supply, voltage, this detection that just causes frequency, phase place is inaccuracy very, if microprocessor carries out sharing control according to the method for controlling such as PID to AC power on this basis, control precision is lower, is easy to cause load to burn.
Summary of the invention
The signal pickup assembly that the object of this invention is to provide a kind of alternating current power current-sharing output system, respectively each single phase poaer supply of AC power and current-sharing power supply is carried out to electric current and voltage acquisition, make the signal that collects more accurate, thereby improved the current sharing control accuracy of microprocessor to AC power.
Another object of the present invention is to provide a kind of signal processing method of alternating current power current-sharing output system, can accurately detect amplitude, frequency and the phase place of each single phase poaer supply in AC power and current-sharing power supply, thereby further improve the current sharing control accuracy of microprocessor to AC power, prevent that load from burning.
To achieve these goals, the invention provides a kind of signal pickup assembly of alternating current power current-sharing output system, comprise microprocessor, it is characterized in that: also comprise three the first current sample modules, three the first voltage sample modules, 3*N the second current sample module and 3*N second voltage sampling modules, N is greater than zero integer, and wherein each phase of AC power connects this microprocessor by a first current sample module, a first voltage sample module respectively;
Described the first current sample module is for gathering the electric current of the corresponding single phase poaer supply of AC power and sending to microprocessor, and described the first voltage sample module is for gathering the voltage of the corresponding single phase poaer supply of AC power and sending to microprocessor;
Described microprocessor is used for this AC power to carry out sharing control, and exports N current-sharing power supply, and each phase of each current-sharing power supply connects this microprocessor by a second current sample module, a second voltage sampling module respectively;
Described the second current sample module is for gathering the electric current of corresponding current-sharing power supply single phase poaer supply and sending to microprocessor, and described second voltage sampling module is for gathering the voltage of corresponding current-sharing power supply single phase poaer supply and sending to microprocessor.
This the first current sample module and the second current sample module include current sampling circuit, this current sampling circuit is by filter coil, the second resistance (R2), the first polar capacitor (C1), the second polar capacitor (C2), switching device (Q) and diode (D), wherein this filter coil is equivalent to inductance (L) and first resistance (R1) of series connection, the free end of this inductance (L) connects the minus earth of anodal and this first polar capacitor (C1) of the first polar capacitor (C1) by the second resistance (R2), the free end of this first resistance (R1) connects the minus earth of anodal and this second polar capacitor (C2) of the second polar capacitor (C2), the free end of this inductance (L) connects the positive pole of diode (D) and the minus earth of diode (D), and the free end of this inductance (L) receives the electric current of corresponding single phase poaer supply in AC power or current-sharing power supply by this switching device (Q),
Because being, the electric current I L on inductance (L) treats sample rate current, therefore according to formula IL*R+U2=U1, R represents the resistance value of the first resistance R 1, U2 represents the magnitude of voltage on the second polar capacitor (C2), U1 represents the magnitude of voltage on the first polar capacitor (C1), in the situation that the resistance value R of the first resistance (R1) is certain, only need to measure the magnitude of voltage on the first electric capacity (C1) and the second electric capacity (C2), by microprocessor, calculate the current value that can obtain corresponding single phase poaer supply in AC power or current-sharing power supply.
This first voltage sample module and second voltage sampling module are all selected voltage transformer.
The present invention also provides a kind of signal processing method of the signal pickup assembly based on above-mentioned alternating current power current-sharing output system, comprise microprocessor, three the first current sample modules, three the first voltage sample modules, 3*N the second current sample module and 3*N second voltage sampling modules, N is greater than zero integer, and wherein each phase of AC power connects this microprocessor by a first current sample module, a first voltage sample module respectively;
Described the first current sample module is for gathering the electric current of the corresponding single phase poaer supply of AC power and sending to microprocessor, and described the first voltage sample module is for gathering the voltage of the corresponding single phase poaer supply of AC power and sending to microprocessor;
Described microprocessor is used for this AC power to carry out sharing control, and exports N current-sharing power supply, and each phase of each current-sharing power supply connects this microprocessor by a second current sample module, a second voltage sampling module respectively;
Described the second current sample module is for gathering the electric current of corresponding current-sharing power supply single phase poaer supply and sending to microprocessor, and described second voltage sampling module is for gathering the voltage of corresponding current-sharing power supply single phase poaer supply and sending to microprocessor;
It is characterized in that this microprocessor also processes electric current, the voltage of each single phase poaer supply in the electric current of each single phase poaer supply in this AC power, voltage and the plurality of current-sharing power supply respectively, thereby obtain respectively amplitude, frequency and the phase place of electric current and voltage, in AC power or current-sharing power supply, the electric current of single phase poaer supply and voltage signal processing procedure are carried out according to following steps:
A, respectively electric current and voltage signal are carried out to digital mixing, window function filtering and Fourier transform, obtain thus the amplitude of electric current and voltage signal;
B, respectively to the electric current after processing of step A and the filtering of voltage signal frequency-division section, realized the filtering of electric current and voltage signal frequency, obtain thus the frequency of electric current and voltage signal, and respectively the electric current after processing of step A and voltage signal are carried out to all-pass wave filtering, realized the filtering of electric current and voltage signal phase place;
C, respectively the electric current after all-pass wave filtering and voltage signal are carried out to two closed-loop digitals and control;
D, to electric current and voltage signal after step C processes, adopt improved zero crossing detection method to carry out phase-locked respectively;
E, respectively the current signal after phase-locked and voltage signal are carried out to filtering processing, convert rectangle square wave to, and the rectangle square wave of the rectangle square wave of current signal and voltage signal is carried out to XOR processing, the width of measurement waveform after XOR is processed, obtain the timing ga(u)ge numerical value T0 of microprocessor, according to formula
calculate the phase place of this single phase poaer supply, wherein Tc represents the instruction cycle of microprocessor, and T represents the cycle of AC power.
In this steps A during by digital mixing in required sine value and cosine value at least one, required butterfly computation is stored in memory cell when required window function and Fourier transform during window function filtering, in digital mixing, window function filtering and Fourier transform process, from memory cell, directly call.
The process of respectively electric current and voltage signal being carried out to digital mixing, window function filtering and Fourier transform in this steps A includes following steps:
A1, signal is sent in fifo queue, judge that whether fifo queue is half-full: if judge that this fifo queue is not half-full, the signal in fifo queue is carried out to analog-to-digital conversion, and required sine value or cosine value while transferring digital mixing from this memory cell, carries out digital mixing to the signal of this digital form;
A2, the signal after digital mixing is carried out CIC filtering and extracts the signal that D unit length is Mx, the binary system length M=Mx*D of this Fourier transform wherein, D is greater than zero integer;
The signal length that A3, judgement are extracted whether >=M: if the signal length >=M extracting transfers the window function in memory cell, the signal extracting is carried out to windowing process, i.e. window function filtering;
If the signal length < M extracting, end operation;
A4, from memory cell, transfer butterfly computation, the signal after windowing process is carried out to the Fourier transform of plural form.
If judge that this fifo queue is half-full in this steps A 1, further judge whether the frequency of signal changes: if the frequency of signal changes, automatically choose the resolution bandwidth of adaptation, according to this resolution bandwidth, recalculate the binary system length M of Fourier transform, and according to this binary system length M, obtain new window function and the butterfly computation factor, thereby upgrade window function and butterfly computation in memory cell;
If the frequency of signal does not change, do not upgrade window function and butterfly computation.
In this step B, when respectively the electric current after processing of step A and voltage signal being carried out to all-pass wave filtering, increased fuzzy control method.
In step B, during respectively to the electric current after processing of step A and the filtering of voltage signal frequency-division section, signal selects the filter adapting to carry out filtering processing according to following steps respectively in each frequency range:
B1, judge whether signal requires linear frequency response in a frequency range: if require linear frequency response, select finite impulse response filter to carry out filtering processing; If do not require linear frequency response, further judge whether signal allows multiband filtering in this frequency range;
If B2 signal does not allow multiband filtering in this frequency range, further judge whether to require narrow transition band: if require narrow transition band, select high-order Butterworth filter to carry out filtering processing, otherwise select low order Butterworth filter to carry out filtering processing;
If signal allows multiband filtering in this frequency range, further judge whether to require narrow as far as possible transitional region: if require narrow as far as possible transitional region, select elliptic filter to carry out filtering processing, if do not require narrow as far as possible transitional region, further judging whether to allow has ripple in passband;
If B3 signal does not have ripple in this frequency range does not allow passband, select Chebyshev II filter to carry out filtering processing; If signal allows there is ripple in passband in this frequency range, further judging whether to allow has ripple in arrowband;
If B4 signal does not have ripple in this frequency range does not allow arrowband, select Chebyshev filter to carry out filtering processing; If signal allows there is ripple in arrowband in this frequency range, further judge whether to allow multiband filtering;
If B5 signal allows multiband filtering in this frequency range, select elliptic filter to carry out filtering processing; If signal does not allow multiband filtering in this frequency range, select IIR filter to carry out filtering processing.
In this step B5, the filtering processing procedure of this IIR filter is comprised of following steps:
B50, signal is carried out to non-linear correction process of fitting treatment, improved thus IIR filter filtering accuracy;
B51, by the combination of matching signal and sampled signal and this composite signal is carried out to spectrum analysis, calculate the frequency parameter of this signal;
B52, this signal is carried out digital filtering processing and the signal of digital form is carried out to spectrum analysis, calculate the sample frequency that the frequency of this signal adapts;
B53, judge whether sample frequency changes: if sample frequency converts, the sample frequency of update signal, and sampled signal again;
B53, the signal of resampling is carried out to digital filtering processing, and the signal of digital form is carried out to power spectrum and numerical integration is processed;
B54, the quality of the signal after power spectrum and numerical integration are processed is detected: if quality meets the demands, finish filtering; If quality does not meet the demands, signal is weighted to processing, and repeating step B53～B54.
In sum, owing to having adopted technique scheme, the invention has the beneficial effects as follows:
1, in traditional alternating current power current-sharing output system, conventionally only AC power and current-sharing power supply are carried out to whole-sample, in the present invention, this signal pickup assembly is sampled to the electric current of each single phase poaer supply of AC power and current-sharing power supply, voltage respectively, the signal collecting is more accurate, thereby has improved the current sharing control accuracy of microprocessor to AC power;
2, in the first current sample module of this signal pickup assembly and the second current sample module, increased current sampling circuit, due to the electric current I on inductance
lbe and treat sample rate current, therefore according to formula I
l* R+U
2=U
1, R represents the resistance value of the first resistance R 1, U
2represent the magnitude of voltage on the second polar capacitor C2, U
1represent the magnitude of voltage on the first polar capacitor, in the situation that the resistance value R of the first resistance is certain, only need to measure the magnitude of voltage on the first electric capacity and the second electric capacity, by microprocessor, calculate the current value that can obtain corresponding single phase poaer supply in AC power or current-sharing power supply, this current sampling circuit is converted to voltage detecting by current sample, makes that this current sample method is simpler, lossless and cost is low;
3, in this signal processing method, when detected amplitude, adopt signal is carried out to digital mixing, window function filtering and Fourier transform, make the detection of amplitude more accurate; The form that adopts frequency-division section filtering when detecting frequency, makes the detection of frequency more accurate; When detected phase, adopt the form of all-pass wave filtering, before phase-locked, carry out two closed-loop digitals control, improved phase-locked precision, when phase-locked, adopt improved zero crossing detection method, realize the accurately phase-locked of phase place, and after phase-locked, the current signal of single phase poaer supply and voltage signal have been converted to rectangle square wave and carry out XOR processing, measured the width of waveform after XOR is processed, obtain the timing ga(u)ge numerical value T0 of microprocessor, according to formula
calculate the phase place of this single phase poaer supply, wherein Tc represents the instruction cycle of microprocessor, and T represents the cycle of AC power, has avoided thus in current signal and voltage signal acquisition process because distortion appears in non-linear factor;
4, signal is being carried out to digital mixing, in the process of window function filtering and Fourier transform, during by digital mixing in required sine value and cosine value at least one, during window function filtering, required butterfly computation is stored in memory cell when required window function and Fourier transform, at digital mixing, in window function filtering and Fourier transform process, from memory cell, directly call, needn't be separately for these programs be opened up internal memory, saved memory source, reduced hardware cost, and needn't read one by one these programs when carrying out, greatly improved the execution efficiency of program,
5, signal is being carried out in the process of digital mixing, window function filtering and Fourier transform, when conversion occurs the frequency of signal, automatically select the resolution bandwidth of adaptation, thereby obtain new window function and the butterfly computation factor, according to signal frequency, window function is upgraded, not only can in Fourier transform, identify better this signal frequency, and can prevent that computing time is long, improve the speed of Fourier transform, and according to signal frequency, butterfly computation is upgraded, improved the accuracy that Fourier transform is calculated;
6, in the process of signal being carried out to all-pass wave filtering, increase fuzzy control method, thereby improved the control precision of all-pass wave filtering and the real-time of control command;
7, in to signal frequency split section filtering, the filter that signal adapts in each Frequency Band Selection most carries out filtering processing, and cannot carry out when filtering is processed carrying out filtering processing by finite impulse response filter to signal in IIR filter, made up the deficiency of IIR filter, making signal can realize digital filtering completely processes, thereby improved filtering accuracy, improved the accuracy that signal frequency detects;
8, the filtering processing procedure of IIR filter is improved, increased sample frequency Automatic Calibration Technique, make this IIR filter there is adaptation function, and increased numerical integration techniques, the reliability of the filtering processing of IIR filter is increased.
Accompanying drawing explanation
Examples of the present invention will be described by way of reference to the accompanying drawings, wherein:
Fig. 1 is the circuit theory diagrams of conventional AC power supply current-sharing output system;
Fig. 2 is the circuit theory diagrams of signal pickup assembly in the present invention;
Fig. 3 is the circuit diagram of the first current sample module and second circuit sampling module in the present invention;
Fig. 4 is the overall flow figure of signal processing method in the present invention;
Fig. 5 is the flow chart of signal digital mixing in the present invention, window function filtering and Fourier transform;
Fig. 6 is the flow chart of the filter that in the present invention, signal adapts in each Frequency Band Selection;
Fig. 7 is the flow chart of the filtering processing procedure of IIR filter in the present invention.
Embodiment
Disclosed all features in this specification, or the step in disclosed all methods or process, except mutually exclusive feature and/or step, all can combine by any way.
Disclosed arbitrary feature in this specification (comprising any accessory claim, summary and accompanying drawing), unless narration especially all can be replaced by other equivalences or the alternative features with similar object.That is,, unless narration especially, each feature is an example in a series of equivalences or similar characteristics.
As shown in Figure 2, this AC power current equalization output device is comprised of three the first current sample modules, three the first voltage sample modules, 3*N the second current sample module, a 3*N second voltage sampling module and microprocessors, N is greater than zero integer, and wherein each phase of AC power connects this microprocessor by a first current sample module, a first voltage sample module respectively; The first current sample module is for gathering the electric current of the corresponding single phase poaer supply of AC power and sending to microprocessor, and described the first voltage sample module is for gathering the voltage of the corresponding single phase poaer supply of AC power and sending to microprocessor; Microprocessor is used for this AC power to carry out sharing control, and exports N current-sharing power supply, and each phase of each current-sharing power supply connects this microprocessor by a second current sample module, a second voltage sampling module respectively; The second current sample module is for gathering the electric current of corresponding current-sharing power supply single phase poaer supply and sending to microprocessor, and second voltage sampling module is for gathering the voltage of corresponding current-sharing power supply single phase poaer supply and sending to microprocessor.
In the present invention, this signal pickup assembly gathers respectively electric current and the voltage of AC power and each single phase poaer supply of current-sharing power supply, thereby for microprocessor carries out sharing control to AC power, provide more accurate data foundation, thereby improved the current sharing control accuracy of AC power.
As shown in Figure 3, this first current sample module and the second current sample module form by current transformer and current sampling circuit, and wherein the input of this current transformer is for receiving the electric current of AC power or the corresponding single phase poaer supply of current-sharing power supply.This current sampling circuit is by filter coil, the second resistance R 2, the first polar capacitor C1, the second polar capacitor C2, switching device Q and diode D, wherein this filter coil is equivalent to inductance L and first resistance R 1 of series connection, the free end of this inductance L connects the minus earth of anodal and this first polar capacitor C1 of the first polar capacitor C1 by the second resistance R 2, the free end of this first resistance R 1 connects the minus earth of anodal and this second polar capacitor C2 of the second polar capacitor C2; The free end of this inductance L connects the positive pole of diode D and the minus earth of diode D, and the free end of this inductance L treats sample rate current by this switching device Q input, connects the output of current transformer.
U in this current sampling circuit
l+ I
l* R+U
2=U
1+ I
c1* R ', wherein U
l, I
lrepresent respectively magnitude of voltage, current value in inductance L, R represents the resistance value of the first resistance R 1, U
2represent the magnitude of voltage on the second polar capacitor C2, U
1represent the magnitude of voltage on the first polar capacitor C1, I
c1represent the current value in the first capacitor C 1, R ' represents the resistance value of the second resistance R 2.Because inductance L powers on, to be pressed in the mean value in switch periods be 0, i.e. U
l=0, and the mean value of the first capacitor C 1 charging and discharging currents in a switch periods is 0, i.e. I
c1=0, above-mentioned formula can be expressed as I
l* R+U
2=U
1, due to the electric current I in inductance L
lbe and treat sample rate current, therefore in the situation that the resistance value R of the first resistance R 1 is certain, only need to measure the magnitude of voltage in the first capacitor C 1 and the second capacitor C 2, by microprocessor, calculate the current value that can obtain corresponding single phase poaer supply in AC power or current-sharing power supply.
Above-mentioned current sampling circuit is converted to voltage detecting by current sample, makes that this current sample method is simpler, lossless and cost is low.In addition, in the first embodiment of the present invention, this switching device Q selects MOSFET pipe, the free end of this inductance L connects the source electrode of this MOSFET pipe, and the drain electrode of this MOSFET pipe treats that for receiving sample rate current and grid are for reception control signal, realizes conducting and the disconnection of MOSFET pipe.It should be noted: this switching device Q can also adopt IGBT pipe, pliotron and other device for power switching.
In addition, in the present invention, this first voltage sample module and second voltage sampling module are selected voltage transformer.
In the present invention, microprocessor is also processed electric current, the voltage of each single phase poaer supply in the electric current of each single phase poaer supply in this AC power, voltage and the plurality of current-sharing power supply respectively, thereby obtains respectively amplitude, frequency and the phase place of electric current and voltage.In AC power or current-sharing power supply, the electric current of single phase poaer supply and voltage signal processing procedure are carried out according to following steps, as shown in Figure 4.
The first step, respectively electric current and voltage signal are carried out to digital mixing, window function filtering and Fourier transform, obtain thus the amplitude of electric current and voltage signal in this single phase poaer supply.
In the first step during by digital mixing in required sine value and cosine value at least one, required butterfly computation is stored in memory cell when required window function and Fourier transform during window function filtering, in digital mixing, window function filtering and Fourier transform process, only need from memory cell, directly call, needn't be separately for these programs be opened up internal memory, saved memory source, reduced hardware cost, and when carrying out, needn't read one by one these programs, greatly improve the execution efficiency of program.
Particularly, the process of respectively electric current and voltage signal being carried out to digital mixing, window function filtering and Fourier transform in the first step forms by following steps, as shown in Figure 5:
A1, signal is sent in FIFO (First Input First Output, first-in first-out) queue, is judged that whether this fifo queue is half-full:
If judge that this fifo queue is not half-full, the signal in fifo queue is carried out to analog-to-digital conversion, and required sine value or cosine value while transferring digital mixing from memory cell, the signal of this digital form is carried out to digital mixing;
If judge that this fifo queue is half-full, further judge whether the frequency of signal changes: if the frequency of signal changes, automatically choose the resolution bandwidth of adaptation, according to this resolution bandwidth, recalculate the binary system length M of Fourier transform, and according to this binary system length M, obtain new window function and the new butterfly computation factor, thereby upgrade window function and the butterfly computation in memory cell; If the frequency of signal does not change, do not upgrade window function and butterfly computation.
In Fourier transform process, resolution bandwidth is larger, and the binary system length M of Fourier transform is less; Resolution bandwidth is less, and the binary system length M of Fourier transform is larger.Yet, if resolution bandwidth is excessive, can cause each frequency that is not easily distinguishable in frequency spectrum, and if resolution bandwidth too small, can cause computing time long, therefore select suitable window function to seem extremely important.Steps A 1 is automatically selected the resolution bandwidth of adaptation when conversion occurs the frequency of signal, thereby obtain new window function and the butterfly computation factor, according to signal frequency, window function is upgraded, not only can in Fourier transform, identify better this signal frequency, and can prevent that computing time is long, improve the speed of Fourier transform, and according to signal frequency, butterfly computation is upgraded, improved the accuracy that Fourier transform is calculated.
A2, the signal after digital mixing is carried out to CIC (Cascaded Intergrator Comb, cascade integral comb filter) filtering, and extract the signal that D unit length is Mx, binary system length M=the Mx*D of Fourier transform wherein, D is greater than zero integer and can artificially sets, and in the present invention, this D gets 4.
The signal length that A3, judgement are extracted whether >=M: if the signal length >=M extracting transfers the window function in memory cell, the signal extracting is carried out to windowing process, i.e. window function filtering;
If the signal length < M extracting, end operation.
A4, from memory cell, transfer butterfly computation, the signal after windowing process is carried out to the Fourier transform of plural form.
Second step, respectively electric current and voltage signal after the first step is processed are carried out to all-pass wave filtering, realized the filtering of electric current and voltage signal phase place; And electric current and the filtering of voltage signal frequency-division section to after the first step is processed, realized the filtering of electric current and voltage signal frequency, obtains thus the frequency of electric current and voltage signal.
Particularly, in second step, when the signal to after the first step is processed carries out all-pass wave filtering, increased FUZZY ALGORITHMS FOR CONTROL, thereby improved the control precision of all-pass wave filtering and the real-time of control command.Because FUZZY ALGORITHMS FOR CONTROL is known technology for those of ordinary skills, therefore at this, will not tire out and state.
Particularly, in second step, when the electric current to after the first step is processed and the filtering of voltage signal frequency-division section, signal selects the filter adapting to carry out filtering processing according to following steps respectively in each frequency range, as shown in Figure 6:
B1, judge whether signal requires linear frequency response in a frequency range: if require linear frequency response, select finite impulse response filter (being FIR filter) to carry out filtering processing; If do not require linear frequency response, further judge whether signal allows multiband filtering in this frequency range;
If B2 signal does not allow multiband filtering in this frequency range, further judge whether to require narrow transition band: if require narrow transition band, select high-order Butterworth filter to carry out filtering processing, otherwise select low order Butterworth filter to carry out filtering processing;
If signal allows multiband filtering in this frequency range, further judge whether to require narrow as far as possible transitional region: if require narrow as far as possible transitional region, select elliptic filter to carry out filtering processing, if do not require narrow as far as possible transitional region, further judging whether to allow has ripple in passband;
If B3 signal does not have ripple in this frequency range does not allow passband, select Chebyshev II filter to carry out filtering processing; If signal allows there is ripple in passband in this frequency range, further judging whether to allow has ripple in arrowband;
If B4 signal does not have ripple in this frequency range does not allow arrowband, select Chebyshev filter to carry out filtering processing; If signal allows there is ripple in arrowband in this frequency range, further judge whether to allow multiband filtering;
If B5 signal allows multiband filtering in this frequency range, select elliptic filter to carry out filtering processing; If signal does not allow multiband filtering in this frequency range, select IIR filter (being iir filter) to carry out filtering processing.
In step B, not the signal after processing of step A is carried out to single filtering, but frequency-division section filtering, the filter adapting to most in each Frequency Band Selection carries out filtering processing, and cannot carry out when filtering is processed carrying out filtering processing by finite impulse response filter to signal in IIR filter, made up the deficiency of IIR filter, make signal can realize digital filtering completely and process, thereby improved filtering accuracy, improved the accuracy that signal frequency detects.
It should be noted: above-mentioned finite impulse response filter, high-order Butterworth filter, low order Butterworth filter, elliptic filter, Chebyshev II filter, ratio snow husband's filter and IIR filter are mature technology, at this, will not tire out and state.
In addition,, in order to improve the filtering speed of finite impulse response filter, the present invention carries out sine transform or cosine transform to the signal of finite impulse response filter output.
In order to improve filtering accuracy and the efficiency of IIR filter, increase adaptive ability and improve the reliability of filtering, the present invention has improved IIR filter.As shown in Figure 7, in step B5, the filtering processing procedure of this IIR filter is comprised of following steps:
B50, signal is carried out to non-linear correction process of fitting treatment, improved thus IIR filter filtering accuracy;
B51, by the combination of matching signal and sampled signal and this composite signal is carried out to spectrum analysis, calculate the frequency parameter of this signal;
B52, this signal is carried out digital filtering processing and the signal of digital form is carried out to spectrum analysis, calculate the sample frequency that the frequency of this signal adapts;
B53, judge whether sample frequency changes: if sample frequency converts, the sample frequency of update signal, and sampled signal again;
B53, the signal of resampling is carried out to digital filtering processing, and the signal of digital form is carried out to power spectrum and numerical integration is processed;
B54, the quality of the signal after power spectrum and numerical integration are processed is detected: if quality meets the demands, finish filtering; If quality does not meet the demands, signal is weighted to processing, and repeating step B53～B54.
In the filtering processing procedure of IIR filter, increased sample frequency Automatic Calibration Technique, make this IIR filter there is adaptation function, and increased numerical integration techniques, the reliability of the filtering processing of IIR filter is increased.
The 3rd step, respectively the electric current after all-pass wave filtering and voltage signal in second step being carried out to two closed-loop digitals controls, take input phase as fiducial value, output phase is that sampled value compares, by this pair of closed-loop digital, control, make output phase follow the tracks of input phase, thereby guarantee phase place real-time stabilization, accurately phase-locked.Because two closed-loop digitals are controlled as those of ordinary skills know technology, therefore at this, will not tire out and state.
The 4th step, to electric current and voltage signal after the 3rd step is processed, adopt improved zero crossing detection method to carry out phase-locked respectively.Traditional zero crossing detection method is subject to the impact of high-frequency interferencing signal, cannot accurately detect zero crossing, so the present invention adopts improved zero crossing detection method.
Generally, establishing certain single-phase fundamental phase voltage amplitude of survey is that U1, initial phase are φ 1, and angular frequency is ω.Disturbance is expressed as to the stack of high-frequency signal, the amplitude of n high fdrequency component is that Un, initial phase are φ n, and this phase voltage is expressed as
For eliminating the impact of high-frequency signal on zero point, adopt Coordinate Conversion to process, by a-b Coordinate Conversion to d-q coordinate
After elimination high fdrequency component, obtain two DC component
By the u obtaining
dand u
qa-b coordinate is changed in contravariant, obtains
eliminate thus the impact of high-frequency signal on zero point, thereby realized the accurately phase-locked of phase place.
The 5th step, respectively the current signal after phase-locked and voltage signal are carried out to filtering processing, convert rectangle square wave to, and the rectangle square wave of the rectangle square wave of current signal and voltage signal is carried out to XOR processing, the width of measurement waveform after XOR is processed, obtain the timing ga(u)ge numerical value T0 of microprocessor, according to formula
calculate the phase place of this single phase poaer supply, wherein Tc represents the instruction cycle of microprocessor, and T represents the cycle of AC power.By this step, avoided in current signal and voltage signal acquisition process because distortion appears in non-linear factor (such as load).
In the present invention, microcontroller, according to the AC power accurately detecting and amplitude, frequency and the phase place of current-sharing power supply, adopts PID method to carry out sharing control.In the first embodiment of the present invention, in sharing control process, only need by PID method, calculate respectively the duty ratio of switching device in each second current sampling circuit, can realize sharing control, proportionally demand is exported a plurality of current-sharing power supplies.
The present invention is not limited to aforesaid embodiment.The present invention expands to any new feature or any new combination disclosing in this manual, and the arbitrary new method disclosing or step or any new combination of process.
Claims (7)
1. the signal processing method of the signal pickup assembly based on alternating current power current-sharing output system, comprise microprocessor, three the first current sample modules, three the first voltage sample modules, 3*N the second current sample module and 3*N second voltage sampling modules, N is greater than zero integer, and wherein each phase of AC power connects this microprocessor by a first current sample module, a first voltage sample module respectively;
Described the first current sample module is for gathering the electric current of the corresponding single phase poaer supply of AC power and sending to microprocessor, and described the first voltage sample module is for gathering the voltage of the corresponding single phase poaer supply of AC power and sending to microprocessor;
Described microprocessor is used for this AC power to carry out sharing control, and exports N current-sharing power supply, and each phase of each current-sharing power supply connects this microprocessor by a second current sample module, a second voltage sampling module respectively;
Described the second current sample module is for gathering the electric current of corresponding current-sharing power supply single phase poaer supply and sending to microprocessor, and described second voltage sampling module is for gathering the voltage of corresponding current-sharing power supply single phase poaer supply and sending to microprocessor;
It is characterized in that this microprocessor also processes electric current, the voltage of each single phase poaer supply in the electric current of each single phase poaer supply in this AC power, voltage and a plurality of current-sharing power supply respectively, thereby obtain respectively amplitude, frequency and the phase place of electric current and voltage, in AC power or current-sharing power supply, the electric current of single phase poaer supply and voltage signal processing procedure are carried out according to following steps:
A, respectively electric current and voltage signal are carried out to digital mixing, window function filtering and Fourier transform, obtain thus the amplitude of electric current and voltage signal;
B, respectively to the electric current after processing of step A and the filtering of voltage signal frequency-division section, realized the filtering of electric current and voltage signal frequency, obtain thus the frequency of electric current and voltage signal, and respectively the electric current after processing of step A and voltage signal are carried out to all-pass wave filtering, realized the filtering of electric current and voltage signal phase place;
C, respectively the electric current after all-pass wave filtering and voltage signal are carried out to two closed-loop digitals and control;
D, to electric current and voltage signal after step C processes, adopt improved zero crossing detection method to carry out phase-locked respectively;
E, respectively the current signal after phase-locked and voltage signal are carried out to filtering processing, convert rectangle square wave to, and the rectangle square wave of the rectangle square wave of current signal and voltage signal is carried out to XOR processing, the width of measurement waveform after XOR is processed, obtain the timing ga(u)ge numerical value T0 of microprocessor, according to formula
calculate the phase place of this single phase poaer supply, wherein Tc represents the instruction cycle of microprocessor, and T represents the cycle of AC power.
2. the signal processing method of the signal pickup assembly based on alternating current power current-sharing output system according to claim 1, while it is characterized in that in this steps A digital mixing in required sine value and cosine value at least one, required butterfly computation is stored in memory cell when required window function and Fourier transform during window function filtering, in digital mixing, window function filtering and Fourier transform process, from memory cell, directly call.
3. the signal processing method of the signal pickup assembly based on alternating current power current-sharing output system according to claim 2, is characterized in that in this steps A that respectively the process of electric current and voltage signal being carried out to digital mixing, window function filtering and Fourier transform includes following steps:
A1, signal is sent in fifo queue, judge that whether fifo queue is half-full: if judge that this fifo queue is not half-full, the signal in fifo queue is carried out to analog-to-digital conversion, and required sine value or cosine value while transferring digital mixing from this memory cell, carries out digital mixing to the signal of this digital form;
A2, the signal after digital mixing is carried out CIC filtering and extracts the signal that D unit length is Mx, the binary system length M=Mx*D of this Fourier transform wherein, D is greater than zero integer;
The signal length that A3, judgement are extracted whether >=M: if the signal length >=M extracting transfers the window function in memory cell, the signal extracting is carried out to windowing process, i.e. window function filtering;
If the signal length <M extracting, end operation;
A4, from memory cell, transfer butterfly computation, the signal after windowing process is carried out to the Fourier transform of plural form.
4. the signal processing method of the signal pickup assembly based on alternating current power current-sharing output system according to claim 3, if it is characterized in that judging that this fifo queue is half-full in this steps A 1, further judge whether the frequency of signal changes: if the frequency of signal changes, automatically choose the resolution bandwidth of adaptation, according to this resolution bandwidth, recalculate the binary system length M of Fourier transform, and according to this binary system length M, obtain new window function and the butterfly computation factor, thereby upgrade window function and butterfly computation in memory cell;
If the frequency of signal does not change, do not upgrade window function and butterfly computation.
5. the signal processing method of the signal pickup assembly based on alternating current power current-sharing output system according to claim 1, is characterized in that: in this step B, when respectively the electric current after processing of step A and voltage signal being carried out to all-pass wave filtering, increased fuzzy control method.
6. the signal processing method of the signal pickup assembly based on alternating current power current-sharing output system according to claim 1, while it is characterized in that in step B respectively to the electric current after processing of step A and the filtering of voltage signal frequency-division section, signal selects the filter adapting to carry out filtering processing according to following steps respectively in each frequency range:
B1, judge whether signal requires linear frequency response in a frequency range: if require linear frequency response, select finite impulse response filter to carry out filtering processing; If do not require linear frequency response, further judge whether signal allows multiband filtering in this frequency range;
If B2 signal does not allow multiband filtering in this frequency range, further judge whether to require narrow transition band: if require narrow transition band, select high-order Butterworth filter to carry out filtering processing, otherwise select low order Butterworth filter to carry out filtering processing;
If signal allows multiband filtering in this frequency range, further judge whether to require narrow as far as possible transitional region: if require narrow as far as possible transitional region, select elliptic filter to carry out filtering processing, if do not require narrow as far as possible transitional region, further judging whether to allow has ripple in passband;
If B3 signal does not have ripple in this frequency range does not allow passband, select Chebyshev's II filter to carry out filtering processing; If signal allows there is ripple in passband in this frequency range, further judging whether to allow has ripple in arrowband;
If B4 signal does not have ripple in this frequency range does not allow arrowband, select Chebyshev filter to carry out filtering processing; If signal allows there is ripple in arrowband in this frequency range, further judge whether to allow multiband filtering;
If B5 signal allows multiband filtering in this frequency range, select elliptic filter to carry out filtering processing; If signal does not allow multiband filtering in this frequency range, select IIR filter to carry out filtering processing.
7. the signal processing method of the signal pickup assembly based on alternating current power current-sharing output system according to claim 6, is characterized in that: in this step B5, the filtering processing procedure of this IIR filter is comprised of following steps:
B50, signal is carried out to non-linear correction process of fitting treatment, improved thus IIR filter filtering accuracy;
B51, by the combination of matching signal and sampled signal and this composite signal is carried out to spectrum analysis, calculate the frequency parameter of this signal;
B52, this signal is carried out digital filtering processing and the signal of digital form is carried out to spectrum analysis, calculate the sample frequency that the frequency of this signal adapts;
B53, judge whether sample frequency changes: if sample frequency converts, the sample frequency of update signal, and sampled signal again;
B53, the signal of resampling is carried out to digital filtering processing, and the signal of digital form is carried out to power spectrum and numerical integration is processed;
B54, the quality of the signal after power spectrum and numerical integration are processed is detected: if quality meets the demands, finish filtering; If quality does not meet the demands, signal is weighted to processing, and repeating step B53～B54.
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