CN109406854A - Harmonic wave instruction current acquisition methods, device and the equipment of single-phase active power filter - Google Patents
Harmonic wave instruction current acquisition methods, device and the equipment of single-phase active power filter Download PDFInfo
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Abstract
The invention discloses harmonic wave instruction current acquisition methods, device and the equipment of a kind of single-phase active power filter, this method comprises: obtaining load current, network voltage and the DC voltage at current time；Using the phaselocked loop of single-phase active power filter, the angular frequency value and phase value of the AC network at network voltage corresponding current time are obtained；According to load current, active component, DC voltage feedback and phase value, the harmonic wave instruction current at current time is obtained；According to DC voltage, the DC voltage feedback at current time is obtained；According to load current, active component and phase value, the harmonic wave instruction current at current time is obtained；It can be seen that, the present invention obtains harmonic wave instruction current using integral element, influence of low-pass filter during obtaining harmonic wave instruction current is eliminated, keeps the algorithm for obtaining harmonic wave instruction current more simple, and improve the precision and compensation effect of the harmonic wave instruction current of acquisition.
Description
Technical field
The present invention relates to Active Power Filter Technology field, in particular to the harmonic wave instruction current of a kind of single-phase active power filter obtains
Take method, device and equipment.
Background technique
With being widely used for Monophase electric power electronic equipment, a large amount of harmonic waves of generation have seriously affected the electric energy of single-phase power grid
Quality.Therefore, the use of single-phase active electric-power filter becomes the important means of harmonics restraint and reactive compensation.It is main former
Reason is as shown in Figure 1, harmonic wave instruction current module (instruction current calculating) can calculate the harmonic wave instruction current work that compensation needs
For the given of control module, control module passes through control VT1~VT4Turn on and off and make APF (Active Power
Filter, active filter) main circuit generates the electric current of one and instruction current opposite in phase equal in magnitude to reach active filter
The purpose of wave.So the precision of harmonic wave instruction current directly influences the compensation effect of entire single-phase APF system.
It in the prior art, the use of the detection method of most wide harmonic wave instruction current is the detection side based on instantaneous power theory
Method, the mode that this method obtains harmonic wave instruction current are to convert to realize by dq, and schematic diagram is as shown in Fig. 2, pass through low pass
Filter (Low Pass Filter:LPF) is to load current iLCarry out the transformed d axis component of dqIt is handled, obtains d
Axis DC quantityDq inverse transformation is carried out again obtains fundamental current active component if.Load current iLAgain and fundamental current active component
ifIt makes the difference and harmonic current and reactive current summation i can be obtainedh, along with harmonic wave instruction electricity can be obtained in DC side feedback current
Stream
It clearly can be seen that LPF becomes key component in entire detection system by Fig. 2, the performance of LPF determines
The precision of last harmonic wave instruction current.However the type, cutoff frequency such as LPF Bu Tong all can cause final harmonic wave to refer to order
The difference for enabling electric current, including amplitude attenuation, phase delay etc..
Therefore, how simpler convenient acquisition harmonic wave instruction current, avoid the low-pass filtering in traditional algorithm
Influence of the device to harmonic wave instruction current promotes the precision of the harmonic wave instruction current of acquisition, is urgent problem now.
Summary of the invention
The object of the present invention is to provide a kind of harmonic wave instruction current acquisition methods of single-phase active power filter, device and set
It is standby, to obtain harmonic wave instruction current using simple and easy integral element, promote the precision of the harmonic wave instruction current of acquisition.
In order to solve the above technical problems, the present invention provides a kind of harmonic wave instruction current acquisition side of single-phase active power filter
Method, comprising:
Obtain load current, network voltage and the DC voltage at current time；
Using the phaselocked loop of the single-phase active power filter, the friendship at the network voltage corresponding current time is obtained
The angular frequency value and phase value of galvanic electricity net；
According to the load current, the network voltage and the angular frequency value, active point of the load current is calculated
Amount；
According to the DC voltage, the DC voltage feedback at the current time is obtained；
According to the load current, the active component, the DC voltage is fed back and the phase value, described in acquisition
The harmonic wave instruction current at current time.
Optionally, described according to the DC voltage, obtain the DC voltage feedback at the current time, comprising:
The difference of the DC voltage and preset voltage value is input to PI controller, and by the output of the PI controller
It is fed back as the DC voltage.
Optionally, described according to the load current, the network voltage and the angular frequency value, calculate the load electricity
The active component of stream, comprising:
It utilizesCalculate the active power virtual value of the predetermined period where the current time；
Wherein,For the network voltage period, ω (k) is the angular frequency value, and i is the number of samples of the predetermined period, and k is
The current time, VSFor the network voltage, iLFor the load current；
It utilizesCalculate the voltage effective value of the predetermined period；Wherein, | | VS| | it is the electricity
It is pressed with valid value；
It utilizesCalculate the equivalent conductance of the predetermined period；Wherein, G is the equivalent conductance；
Utilize ia(k)=Gvs(k), the active component is calculated；Wherein, vsIt (k) is the network voltage, ia(k) it is
The active component.
Optionally, when the predetermined period is a cycle,Wherein, f is single-phase power grid rated frequency, fsFor institute
State the sample frequency of load current, the network voltage and the DC voltage.
Optionally, described according to the load current, the active component and the phase value, obtain the current time
Harmonic wave instruction current, comprising:
Utilize ih(k)=iL(k)-ia(k), the harmonic current at the current time is calculated；Wherein, ihIt (k) is the harmonic wave
Electric current；
It utilizesCalculate the harmonic wave instruction current；Wherein, idcIt (k) is the direct current
Side Voltage Feedback, θ (k) are the phase value,For the harmonic wave instruction current.
Optionally, load current, network voltage and the DC voltage for obtaining current time, comprising:
The load current, the network voltage and the DC voltage are obtained by sample circuit.
Optionally, described according to the load current, the active component and the phase value, obtain the current time
Harmonic wave instruction current after, further includes:
The compensation difference between currents at the harmonic wave instruction current and the current time are output to hysteresis comparison control device, are obtained
The PWM modulation pulse of the hysteresis comparison control device output is taken, to carry out current tracking compensation.
It is optionally, described that the load current, the network voltage and the DC voltage are obtained by sample circuit,
Include:
The load current, the network voltage, the DC voltage and compensation electricity are obtained by sample circuit
Stream.
The present invention also provides a kind of harmonic wave instruction current acquisition device of single-phase active power filter, comprising:
Sampling obtains module, for obtaining the load current, network voltage and DC voltage at current time；
Computing module obtains the corresponding institute of the network voltage for the phaselocked loop using the single-phase active power filter
State the angular frequency value and phase value of the AC network at current time；
Active component computing module, for calculating according to the load current, the network voltage and the angular frequency value
The active component of the load current；
DC voltage feeds back computing module, for obtaining the direct current at the current time according to the DC voltage
Side Voltage Feedback；
Harmonic wave instruction current computing module, for obtaining according to the load current, the active component and the phase value
Take the harmonic wave instruction current at the current time.
In addition, the present invention also provides a kind of harmonic wave instruction currents of single-phase active power filter to obtain equipment, comprising:
Memory, for storing computer program；
Processor realizes single-phase active power filter as described in any one of the above embodiments when for executing the computer program
The step of harmonic wave instruction current acquisition methods.
The harmonic wave instruction current acquisition methods of a kind of single-phase active power filter provided by the present invention, comprising: obtain current
Load current, network voltage and the DC voltage at moment；Using the phaselocked loop of single-phase active power filter, network voltage pair is obtained
The angular frequency value and phase value of the AC network at the current time answered；According to load current, network voltage and angular frequency value, calculate
The active component of load current；According to DC voltage, the DC voltage feedback at current time is obtained；According to load current,
Active component, DC voltage feedback and phase value, obtain the harmonic wave instruction current at current time；
As it can be seen that the present invention obtains harmonic wave instruction current using integral element, eliminates low-pass filter and refer in acquisition harmonic wave
The influence in current course is enabled, keeps the algorithm for obtaining harmonic wave instruction current more simple, and improves the harmonic wave instruction electricity of acquisition
The precision of stream, so that more preferably, the user experience is improved for compensation effect compared to the single-phase active power filter of traditional algorithm；In addition,
The present invention also provides the harmonic wave instruction current acquisition device and equipment of a kind of single-phase active power filter, equally have above-mentioned beneficial
Effect.
Detailed description of the invention
In order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, to embodiment or will show below
There is attached drawing needed in technical description to be briefly described, it should be apparent that, the accompanying drawings in the following description is only this
The embodiment of invention for those of ordinary skill in the art without creative efforts, can also basis
The attached drawing of offer obtains other attached drawings.
Fig. 1 is a kind of topological structure of single-phase active power filter provided by the embodiment of the present invention and its showing for system control
It is intended to；
Fig. 2 is the schematic diagram of the harmonic wave instruction current acquisition methods of single-phase active power filter in the prior art；
Fig. 3 is a kind of stream of the harmonic wave instruction current acquisition methods of single-phase active power filter provided by the embodiment of the present invention
Cheng Tu；
Fig. 4 is the harmonic wave instruction current acquisition methods of another kind single-phase active power filter provided by the embodiment of the present invention
Flow diagram；
Fig. 5 shows for effect after the compensation of the harmonic wave instruction current acquisition methods of single-phase active power filter in the prior art
Figure；
Fig. 6 is the harmonic wave instruction current acquisition methods of another kind single-phase active power filter provided by the embodiment of the present invention
Effect display diagram after compensation；
Fig. 7 is a kind of knot of the harmonic wave instruction current acquisition device of single-phase active power filter provided by the embodiment of the present invention
Composition.
Specific embodiment
In order to make the object, technical scheme and advantages of the embodiment of the invention clearer, below in conjunction with the embodiment of the present invention
In attached drawing, technical scheme in the embodiment of the invention is clearly and completely described, it is clear that described embodiment is
A part of the embodiment of the present invention, instead of all the embodiments.Based on the embodiments of the present invention, those of ordinary skill in the art
Every other embodiment obtained without making creative work, shall fall within the protection scope of the present invention.
Referring to FIG. 3, Fig. 3 obtains for a kind of harmonic wave instruction current of single-phase active power filter provided by the embodiment of the present invention
Take the flow chart of method.This method may include:
Step 101: obtaining the load current, network voltage and DC voltage at current time.
Wherein, the purpose of this step can be for such as DSP (Digital Signal Processing, Digital Signal Processing)
Load current (nonlinear load side electric current) needed for the processor of chip obtains the harmonic wave instruction current for calculating current time, electricity
Net voltage (single-phase mains voltage) and DC voltage, such as the load current i in Fig. 4L, network voltage VSWith control electric current output
Value idcCorresponding DC voltage Vdc。
Specifically, obtaining load current, network voltage and the DC side electricity at current time for the processor of such as dsp chip
The concrete mode of pressure, can be by designer according to practical scene and user demand self-setting, such as can be direct by dsp chip
Acquisition obtains load current, network voltage and the DC voltage at current time；In view of existing dsp chip sampling rate and
Computing capability can be set sample circuit also as dsp chip and provide load current, network voltage and the DC side electricity at current time
Corresponding sampled signal is pressed, as the sample frequency of sample circuit can be set to fs=10kHz, i.e. dsp chip pass through sampling electricity
Load current, network voltage and the DC voltage at road acquisition current time.As long as processor available current time is negative
It carries electric current, network voltage and DC voltage, the present embodiment and does not do any restrictions to this.
Step 102: using the phaselocked loop of single-phase active power filter, obtaining the alternating current at network voltage corresponding current time
The angular frequency value and phase value of net.
Wherein, the purpose of this step be using in single-phase active power filter phaselocked loop (Phase Locked Loop,
PLL), the network voltage at the current time obtained to sampling calculates, and obtains the angular frequency value and phase of corresponding AC network
The phaselocked loop (PLL) of place value, single-phase shunt active power filter as shown in figure 1 partially will be implemented as digital phase-locked loop, soft-lock phase
Ring will be to the network voltage V for sampling obtained current timeSIt is calculated, and finds out the angular frequency value ω (k) and phase at this moment
Place value θ (k).
Specifically, uncontrollable diode bridge connects RC load simulation nonlinear load in Fig. 1 circuit, in addition to this also wrap
Include the H bridge being made of 4 full-control type power switch, the major loop electricity that the external inductance in exchange side and DC side storage capacitor are constituted
Road.
It is understood that for single-phase active power filter in this step phaselocked loop to the network voltage at current time into
Row calculates, and obtains the angular frequency value of the AC network at current time and the detailed process of phase value, can use and the prior art
The same or similar mode is realized, as long as the processor such as dsp chip can use the phaselocked loop using single-phase active power filter,
Obtain the angular frequency value and phase value of the AC network at the network voltage corresponding current time at current time.The present embodiment is to this
Do not do any restrictions.
Step 103: according to load current, network voltage and angular frequency value, the active component of computational load electric current.
Wherein, the purpose of this step can be the processor such as dsp chip, utilize the load current at current time, power grid
The active component of the load current at current time is calculated in voltage and angular frequency value.
Specifically, this step may include:
Step 201: utilizingThe active power for calculating the predetermined period where current time is effective
Value；Wherein,For the network voltage period, ω (k) is angular frequency value, and i is the number of samples of predetermined period, and k is current
Moment.
It is understood that the predetermined period where current time k in this step, can by designer or user from
Row setting, such as single-phase power grid rated frequency f=50Hz, the sample frequency f of sample circuits=10kHz, that is, processor obtains load
When the frequency of electric current, network voltage and DC voltage is 10kHz, predetermined period can be a cycle, i.e.,
Namely predetermined period be every 200 groups of samples at a cycle.
Step 202: utilizingCalculate the voltage effective value of predetermined period；Wherein, | | VS| | for electricity
It is pressed with valid value.
Step 203: utilizingCalculate the equivalent conductance of predetermined period；Wherein, G is equivalent conductance.
It is understood that the purpose of this step can be to have using the active power virtual value P and voltage of predetermined period
Valid value | | VS| |, the equivalent conductance G of predetermined period is calculated.
Step 204: utilizing ia(k)=Gvs(k), active component is calculated；Wherein, vsIt (k) is load current, ia(k) it is
Active component.
It is understood that the purpose of this step can be the equivalent conductance G for utilizing the predetermined period where current time k
The network voltage v obtained with current time ks(k), the load current i that current time k is obtained is calculatedL(k) active component ia
(k)。
Specifically, with single-phase power grid rated frequency f=50Hz, the sample frequency f of sample circuitsFor=10kHz, it is assumed that
The network voltage v at current times(k)=VmSin θ (k), load currentWherein, VmFor electricity
Pressure amplitude value, INFor current amplitude,For electric current n times component phase, then when predetermined period can be a cycle, by power grid frequency
Rate and sample frequency can obtain a cycle number of samplesIt can be concluded that the active power virtual value of a cycle:
It can be concluded that the voltage effective value of a cycle:
It is corresponding, it can be deduced that the equivalent conductance of a cycle:
Using the equivalent conductance of a cycle, the active component of available load current:
It should be noted that step 201 to step 204 can for by calculate current time where predetermined period etc.
Conductance is imitated, the active component of load current is obtained.For, according to load current, network voltage and angular frequency value, being counted in step 103
The concrete mode of the active component of load current is calculated, it can be by designer's self-setting, as long as the processor such as dsp chip can
To calculate the active component for the load current for obtaining current time, the present embodiment does not do any restrictions to this.
Step 104: according to DC voltage, obtaining the DC voltage feedback at current time.
It is understood that due to line impedance and being opened during controlling the compensation electric current of Active Power Filter-APF
Variation of the system to active power demand caused by the influence and load current for closing loss change, can all lead to DC bus capacitor
The fluctuation of voltage makes DC bus capacitor under-voltage even overvoltage, affects the compensation effect to harmonic current, when serious even
The reliability service of filter can be jeopardized.So while control compensates electric current, it is necessary to DC voltage be kept to be basically unchanged.
It can be as shown in Figure 1, adjusting that control methods control DC voltage and this step can be for by current time using PID
DC voltage Vdc(k) and the difference of preset voltage value (preset reference voltage value) is input to PI controller, and by PI controller
Output as current time DC voltage feedback idc(k)。
Specifically, obtaining the DC voltage at current time for the DC voltage in this step according to current time
The concrete mode of feedback, can be by designer according to practical scene and user demand self-setting, such as using shown in FIG. 1
It, can be above-mentioned in the way of PI controller, when obtaining current when PID adjusting control methods control DC voltage
The DC voltage at quarter is fed back；When being controlled using other modes DC voltage, the DC voltage at current time is anti-
The acquisition modes of feedback can also correspond to change, and the present embodiment does not do any restrictions to this.
It should be noted that the present embodiment does not do any limit for the sequence of this step and step 102 and step 103
System, as long as guaranteeing to hold before obtaining the harmonic wave instruction current at current time using the DC voltage at current time feedback
This step of row obtains the DC voltage feedback at current time, and the present embodiment does not do any restrictions to this.
Step 105: according to load current, active component, DC voltage feedback and phase value, obtaining the humorous of current time
Wave instruction current.
It is understood that as shown in figure 4, this step can be first according to the load current (i at current timeL) and load electricity
Active component (the i of streama), calculate the harmonic current (i at current timeh), such as utilize ih(k)=iL(k)-ia(k), when calculating current
The harmonic current i at quarterh(k)；Further according to the harmonic current (i at current timeh), DC voltage feed back (idc) and phase value (θ),
The harmonic wave instruction current at current time is calculated, is such as utilizedHarmonic wave instruction current is calculated,
In, idc(k) it being fed back for the DC voltage at current time, θ (k) is the phase value at current time,It is humorous for current time
Wave instruction current.
Specifically, for the concrete mode for the harmonic wave instruction current for obtaining current time in this step, it can be by designer
Member's self-setting can such as be realized using aforesaid way, as long as the processor such as dsp chip can be according to the load at current time
Electric current, active component, DC voltage feedback and phase value, obtain the harmonic wave instruction current at current time, the present embodiment is to this
Do not do any restrictions.
It should be noted that active filter can generate one and harmonic current due to when current tracking is compensated and controlled
So that them is offset each other Deng big reversed electric current, to achieve the purpose that compensation harmonic, compensates tracking of the electric current to expectation electric current
Situation is directly related to the compensation effect of harmonic wave.As shown in Figure 1, being needed using current hysteresis comparison control method by this step meter
The harmonic wave instruction current at obtained current timeWith the actual compensation current i at current timeCIt carries out making poor calculating, and
Obtained difference is given in hysteresis comparison control device, corresponding PWM modulation pulse is obtained.Due to electric current in hysteresis comparison control
The presence of feedback, accelerates dynamic responding speed, enhances the ability for inhibiting to disturb in ring, control precision is higher, to load
It is adaptable.But switching frequency, switching loss and the precision of control are all influenced by stagnant annulus ring width, and stagnant annulus is got over
Narrow, the precision of control is higher, and switching frequency is also higher, to increase switching loss.Conversely, stagnant annulus is wider, control essence
Degree is lower, but switching frequency reduces, to reduce switching loss.
That is, can also include by the harmonic wave instruction current at current time and the compensation at current time after this step
Difference between currents are output to hysteresis comparison control device, obtain the PWM modulation pulse of hysteresis comparison control device output, with carry out electric current with
The step of track compensates.It is corresponding, the not only load current, network voltage and DC side at available current time in step 101
Voltage can also obtain the compensation electric current at current time；As processor can obtain the load at current time by sample circuit
Electric current, network voltage, DC voltage and compensation electric current.
Specifically, with single-phase power grid rated frequency f=50Hz, the sample frequency f of sample circuitsFor=10kHz, it is assumed that
The network voltage v at current times(k)=VmSin θ (k), load currentAnd predetermined period can
When thinking a cycle, the method provided by the present embodiment and conventional method pair are established at MATLAB/Simulink
The simulation model of ratio, under the premise of guaranteeing that other parts are all consistent, respectively with biography in current calculation module
System algorithm and this patent propose that method is emulated.Two methods can be such that single-phase APF works normally as the result is shown, and can have
Effect compensates.Power network current i compensated to two methodsSFFT (fast algorithm of discrete fourier transform) analysis is carried out,
Figure five and figure six are respectively i after two methods compensationSTHD (total harmonic distortion), traditional algorithm THD=3.44%, this implementation
Method THD=1.27% provided by example.Method provided by apparent the present embodiment is not only algorithmically compared to tradition
Method is simpler, and compensation effect is promoted there has also been great.
In the present embodiment, the embodiment of the present invention obtains harmonic wave instruction current using integral element, eliminates low-pass filter
Influence during obtaining harmonic wave instruction current keeps the algorithm for obtaining harmonic wave instruction current more simple, and improves acquisition
Harmonic wave instruction current precision so that compensation effect more preferably, improves use compared to the single-phase active power filter of traditional algorithm
Family experience.
Referring to FIG. 7, Fig. 7 obtains for a kind of harmonic wave instruction current of single-phase active power filter provided by the embodiment of the present invention
Take the structure chart of device.The apparatus may include:
Sampling obtains module 100, for obtaining the load current, network voltage and DC voltage at current time；
Computing module 200 obtains network voltage corresponding current time for the phaselocked loop using single-phase active power filter
AC network angular frequency value and phase value；
Active component computing module 300, for according to load current, network voltage and angular frequency value, computational load electric current
Active component；
DC voltage feeds back computing module 400, for obtaining the DC voltage at current time according to DC voltage
Feedback；
Harmonic wave instruction current computing module 500 is used for according to load current, active component and phase value, when obtaining current
The harmonic wave instruction current at quarter.
Optionally, DC voltage feeds back computing module 400, may include:
DC voltage feeds back computational submodule, for the difference of DC voltage and preset voltage value to be input to PI control
Device, and fed back the output of PI controller as DC voltage.
Optionally, active component computing module 300 may include:
The sub- computational submodule of active power, for utilizingIt is default where calculating current time
The active power virtual value in period；Wherein,For the network voltage period, ω (k) is angular frequency value, and i is predetermined period
Number of samples, k is current time, VSFor network voltage, iLFor load current；
Voltage effective value computational submodule, for utilizingThe voltage for calculating predetermined period is effective
Value；Wherein, | | VS| | it is voltage effective value；
Equivalent conductance computational submodule, for utilizingCalculate the equivalent conductance of predetermined period；Wherein, G be etc.
Imitate conductance；
Active component computational submodule, for utilizing ia(k)=Gvs(k), active component is calculated；Wherein, vsIt (k) is electricity
Net voltage, iaIt (k) is active component.
Optionally, harmonic wave instruction current computing module 500 may include:
Harmonic current computational submodule, for utilizing ih(k)=iL(k)-ia(k), the harmonic current at current time is calculated；
Wherein, ihIt (k) is harmonic current；
Harmonic wave instruction current computational submodule, for utilizingCalculate harmonic wave instruction electricity
Stream；Wherein, idc(k) it being fed back for DC voltage, θ (k) is phase value,For harmonic wave instruction current.
Optionally, sampling obtains module 100, may include:
Acquisition submodule is sampled, for obtaining load current, network voltage and DC voltage by sample circuit.
Optionally, which can also include:
Current tracking compensating module, for the compensation difference between currents at harmonic wave instruction current and current time to be output to stagnant ring
Comparison controller obtains the PWM modulation pulse of hysteresis comparison control device output, to carry out current tracking compensation.
Optionally, sampling acquisition submodule can be specifically used for by sample circuit obtain load current, network voltage, directly
Flow side voltage and compensation electric current.
In the present embodiment, the embodiment of the present invention obtains harmonic wave instruction current using integral element, eliminates low-pass filter
Influence during obtaining harmonic wave instruction current keeps the algorithm for obtaining harmonic wave instruction current more simple, and improves acquisition
Harmonic wave instruction current precision so that compensation effect more preferably, improves use compared to the single-phase active power filter of traditional algorithm
Family experience.
In addition, the present invention also provides a kind of harmonic wave instruction currents of single-phase active power filter to obtain equipment, comprising: storage
Device, for storing computer program；Processor is realized single-phase as provided by above-described embodiment when for executing computer program
The step of harmonic wave instruction current acquisition methods of active filter.
Each embodiment is described in a progressive manner in specification, the highlights of each of the examples are with other realities
The difference of example is applied, the same or similar parts in each embodiment may refer to each other.For device disclosed in embodiment and
For equipment, since it is corresponded to the methods disclosed in the examples, so being described relatively simple, related place is referring to method portion
It defends oneself bright.
Professional further appreciates that, unit described in conjunction with the examples disclosed in the embodiments of the present disclosure
And algorithm steps, can be realized with electronic hardware, computer software, or a combination of the two, in order to clearly demonstrate hardware and
The interchangeability of software generally describes each exemplary composition and step according to function in the above description.These
Function is implemented in hardware or software actually, the specific application and design constraint depending on technical solution.Profession
Technical staff can use different methods to achieve the described function each specific application, but this realization is not answered
Think beyond the scope of this invention.
The step of method described in conjunction with the examples disclosed in this document or algorithm, can directly be held with hardware, processor
The combination of capable software module or the two is implemented.Software module can be placed in random access memory (RAM), memory, read-only deposit
Reservoir (ROM), electrically programmable ROM, electrically erasable ROM, register, hard disk, moveable magnetic disc, CD-ROM or technology
In any other form of storage medium well known in field.
It to a kind of harmonic wave instruction current acquisition methods of single-phase active power filter provided by the present invention, device and sets above
It is standby to be described in detail.Used herein a specific example illustrates the principle and implementation of the invention, above
The explanation of embodiment is merely used to help understand method and its core concept of the invention.It should be pointed out that for the art
Those of ordinary skill for, without departing from the principle of the present invention, can also to the present invention carry out it is several improvement and repair
Decorations, these improvements and modifications also fall within the scope of protection of the claims of the present invention.
Claims (10)
1. a kind of harmonic wave instruction current acquisition methods of single-phase active power filter characterized by comprising
Obtain load current, network voltage and the DC voltage at current time；
Using the phaselocked loop of the single-phase active power filter, the alternating current at the network voltage corresponding current time is obtained
The angular frequency value and phase value of net；
According to the load current, the network voltage and the angular frequency value, the active component of the load current is calculated；
According to the DC voltage, the DC voltage feedback at the current time is obtained；
According to the load current, the active component, DC voltage feedback and the phase value, obtain described current
The harmonic wave instruction current at moment.
2. the harmonic wave instruction current acquisition methods of single-phase active power filter according to claim 1, which is characterized in that described
According to the DC voltage, the DC voltage feedback at the current time is obtained, comprising:
The difference of the DC voltage and preset voltage value is input to PI controller, and using the output of the PI controller as
The DC voltage feedback.
3. the harmonic wave instruction current acquisition methods of single-phase active power filter according to claim 1, which is characterized in that described
According to the load current, the network voltage and the angular frequency value, the active component of the load current is calculated, comprising:
It utilizesCalculate the active power virtual value of the predetermined period where the current time；Wherein,For the network voltage period, ω (k) is the angular frequency value, and i is the number of samples of the predetermined period, and k is described
Current time, VSFor the network voltage, iLFor the load current；
It utilizesCalculate the voltage effective value of the predetermined period；Wherein, | | VS| | have for the voltage
Valid value；
It utilizesCalculate the equivalent conductance of the predetermined period；Wherein, G is the equivalent conductance；
Utilize ia(k)=Gvs(k), the active component is calculated；Wherein, vsIt (k) is the network voltage, ia(k) have to be described
Function component.
4. the harmonic wave instruction current acquisition methods of single-phase active power filter according to claim 3, which is characterized in that described
When predetermined period is a cycle,Wherein, f is single-phase power grid rated frequency, fsFor the load current, the power grid
The sample frequency of voltage and the DC voltage.
5. the harmonic wave instruction current acquisition methods of single-phase active power filter according to claim 3, which is characterized in that described
According to the load current, the active component and the phase value, the harmonic wave instruction current at the current time is obtained, is wrapped
It includes:
Utilize ih(k)=iL(k)-ia(k), the harmonic current at the current time is calculated；Wherein, ihIt (k) is the harmonic current；
It utilizesCalculate the harmonic wave instruction current；Wherein, idcIt (k) is the DC side electricity
Pressure feedback, θ (k) are the phase value,For the harmonic wave instruction current.
6. the harmonic wave instruction current acquisition methods of single-phase active power filter according to any one of claims 1 to 5, feature
It is, load current, network voltage and the DC voltage for obtaining current time, comprising:
The load current, the network voltage and the DC voltage are obtained by sample circuit.
7. the harmonic wave instruction current acquisition methods of single-phase active power filter according to claim 6, which is characterized in that described
According to the load current, the active component and the phase value, after the harmonic wave instruction current for obtaining the current time,
Further include:
The compensation difference between currents of the harmonic wave instruction current and the current time are output to hysteresis comparator, are obtained described stagnant
The PWM modulation pulse of ring comparator output, to carry out current tracking compensation.
8. the harmonic wave instruction current acquisition methods of single-phase active power filter according to claim 7, which is characterized in that described
The load current, the network voltage and the DC voltage are obtained by sample circuit, comprising:
The load current, the network voltage, the DC voltage and the compensation electric current are obtained by sample circuit.
9. a kind of harmonic wave instruction current acquisition device of single-phase active power filter characterized by comprising
Sampling obtains module, for obtaining the load current, network voltage and DC voltage at current time；
Computing module obtains that the network voltage is corresponding described to work as the phaselocked loop using the single-phase active power filter
The angular frequency value and phase value of the AC network at preceding moment；
Active component computing module, for according to the load current, the network voltage and the angular frequency value, described in calculating
The active component of load current；
DC voltage feeds back computing module, for obtaining the DC side electricity at the current time according to the DC voltage
Pressure feedback；
Harmonic wave instruction current computing module, for obtaining institute according to the load current, the active component and the phase value
State the harmonic wave instruction current at current time.
10. a kind of harmonic wave instruction current of single-phase active power filter obtains equipment characterized by comprising
Memory, for storing computer program；
Processor realizes single-phase active filtering as claimed in any one of claims 1 to 8 when for executing the computer program
The step of harmonic wave instruction current acquisition methods of device.
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