CN109917170A - A kind of dq electric current detecting method of Pulse rectifier no phase-locked loop - Google Patents
A kind of dq electric current detecting method of Pulse rectifier no phase-locked loop Download PDFInfo
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- CN109917170A CN109917170A CN201910269246.1A CN201910269246A CN109917170A CN 109917170 A CN109917170 A CN 109917170A CN 201910269246 A CN201910269246 A CN 201910269246A CN 109917170 A CN109917170 A CN 109917170A
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Abstract
The invention discloses a kind of dq electric current detecting methods of Pulse rectifier no phase-locked loop.The influence of SOGI and phaselocked loop to dq current observation can be effectively eliminated through the invention.And transplantability of the present invention is stronger, is suitable for single-phase AC/DC DC/AC device, and realizes easy, has stronger versatility.
Description
Technical field
The present invention relates to current transformer fields, and in particular to a kind of current detecting side dq of Pulse rectifier no phase-locked loop
Method.
Background technique
In the dq current control of single-phase AC/DC or DC/AC converter, the acquisition methods of dq electric current generally use second order broad sense
Integral (second-order generalized integrator, SOGI) or delay a quarter period obtain α β electric current
Then component recycles phaselocked loop to obtain the instantaneous phase of voltage, finally obtains dq shaft current using rotating coordinate transformation.But
It is that network voltage frequency has fluctuation, SOGI is more sensitive to frequency；And network voltage has distortion and energy imbalance, locking phase
Ring is affected by voltage distortion, imbalance, will lead to loss of lock under serious conditions.Above-mentioned factor all may cause dq electric current
The problem that observation and actual value are not allowed.
Summary of the invention
For above-mentioned deficiency in the prior art, a kind of dq electricity of Pulse rectifier no phase-locked loop provided by the invention
Stream detection method solves the problems, such as dq current detection value inaccuracy.
In order to achieve the above object of the invention, the technical solution adopted by the present invention are as follows: a kind of Pulse rectifier is without locking phase
The dq electric current detecting method of ring, comprising the following steps:
S1, occur with reference to sinusoidal signal using controller and refer to cosine signal, with reference to sinusoidal signal and cosine will be referred to
Signal is multiplied with the voltage and current of power grid respectively, and obtains voltage low frequency component and electric current low frequency point by productization and difference operation
Amount；
S2, the voltage low frequency component for having phase offset in voltage low frequency component is extracted by low-pass filter, pass through twice
The bandstop filter of mains frequency extracts electric current low frequency component and obtains the electric current low frequency component of not phase offset；
S3, trigonometric function is carried out to the voltage low frequency component for having phase offset, with reference to sinusoidal signal and with reference to cosine signal
Convert the mains voltage signal for having phase offset reconstructed；
S4, it is multiplied by the mains voltage signal for having phase offset of reconstruct with network voltage, and passes through low-pass filter
Obtain phase offset compensation matrix；
S5, by phase offset compensation matrix, have the voltage low frequency component and the not no electric current of phase offset of phase offset
Low frequency component calculates dq electric current.
Further: stating the calculation formula of voltage low frequency component in step S1 are as follows:
In above formula, usFor the voltage on line side of Pulse rectifier,WithRespectively control
The reference sinusoidal signal and refer to cosine signal, ω that device occurs0Fixed angular speed, ω are given for controller generation0=100 π are power grid
The corresponding angular speed of frequency, t are system local zone time, UsmFor the amplitude of voltage, α and β are intermediate variable,It is just remaining for reference
The initial phase of string signal；
The calculation formula of electric current low frequency component are as follows:
In above formula, isFor the current signal of Pulse rectifier, IsmFor the amplitude of electric current, θ is electric current initial phase angle；
The voltage on line side u of Pulse rectifiersWith the current signal i of Pulse rectifiersCalculation formula are as follows:
In above formula, ω is power grid actual angular frequency；
The calculation formula of α and β are as follows:
Further: having the voltage low frequency component of phase offset in the step S2 are as follows:
In above formula, Ud_cosAnd Ud_sinTo there is the voltage low frequency component of phase offset,Phase for voltage low frequency component is inclined
Shifting amount；
There is no the electric current low frequency component of phase offset are as follows:
In above formula, is_sinAnd is_cosFor the electric current low frequency component of not phase offset.
Further: the mains voltage signal for having phase offset reconstructed in the step S3 are as follows:
In above formula,WithFor the mains voltage signal for having phase offset of reconstruct.
Further: phase offset compensation matrix in the step S4 are as follows:
In above formula, CfFor phase offset compensation matrix, wherein
In above formula,WithFor DC component.
Further: the calculation formula of dq electric current in the step S5 are as follows:
In above formula, id、iqFor electric current isDq current component, usdFor voltage on line side usIn the component of d axis；
The invention has the benefit that can effectively eliminate SOGI and phaselocked loop through the invention to dq current observation
Influence.And transplantability of the present invention is stronger, is suitable for single-phase AC/DC DC/AC device, and realizes easy, has stronger
Versatility.
Detailed description of the invention
Fig. 1 is flow chart of the present invention；
Fig. 2 is Pulse rectifier no phase-locked loop dq current detecting schematic diagram in the present invention；
Fig. 3 is the dq given value of current value of Pulse rectifier and the waveform diagram of detected value under 49Hz in the present invention；
Fig. 4 is the dq given value of current value of Pulse rectifier and the waveform diagram of detected value under 50Hz in the present invention；
Fig. 5 is the dq given value of current value of Pulse rectifier and the waveform diagram of detected value under 51Hz in the present invention.
Specific embodiment
A specific embodiment of the invention is described below, in order to facilitate understanding by those skilled in the art this hair
It is bright, it should be apparent that the present invention is not limited to the ranges of specific embodiment, for those skilled in the art,
As long as various change is in the spirit and scope of the present invention that the attached claims limit and determine, these variations are aobvious and easy
See, all are using the innovation and creation of present inventive concept in the column of protection.
As shown in Figure 1, a kind of dq electric current detecting method of Pulse rectifier no phase-locked loop, comprising the following steps:
S1, as shown in Fig. 2, using controller occur with reference to sinusoidal signal and refer to cosine signal, sinusoidal signal will be referred to
Be multiplied respectively with the voltage and current of power grid with reference cosine signal, and by productization and difference operation obtain voltage low frequency component and
Electric current low frequency component.
The calculation formula of voltage low frequency component are as follows:
In above formula, usFor the voltage on line side of Pulse rectifier,WithRespectively control
The reference sinusoidal signal and refer to cosine signal, ω that device occurs0Fixed angular speed, ω are given for controller generation0=100 π are power grid
The corresponding angular speed of frequency, t are system local zone time, UsmFor the amplitude of voltage, α and β are intermediate variable,It is just remaining for reference
The initial phase of string signal；
The calculation formula of electric current low frequency component are as follows:
In above formula, isFor the current signal of Pulse rectifier, IsmFor the amplitude of electric current, θ is electric current initial phase angle；
The voltage on line side u of Pulse rectifiersWith the current signal i of Pulse rectifiersCalculation formula are as follows:
In above formula, ω is power grid actual angular frequency；
The calculation formula of α and β are as follows:
S2, the voltage low frequency component for having phase offset in voltage low frequency component is extracted by low-pass filter, pass through twice
The bandstop filter of mains frequency extracts electric current low frequency component and obtains the electric current low frequency component of not phase offset.
The voltage low frequency component of phase offset are as follows:
In above formula, Ud_cosAnd Ud_sinTo there is the voltage low frequency component of phase offset,Phase for voltage low frequency component is inclined
Shifting amount；
There is no the electric current low frequency component of phase offset are as follows:
In above formula, is_sinAnd is_cosFor the electric current low frequency component of not phase offset.
S3, trigonometric function is carried out to the voltage low frequency component for having phase offset, with reference to sinusoidal signal and with reference to cosine signal
Convert the mains voltage signal for having phase offset reconstructed.
The mains voltage signal for having phase offset of reconstruct are as follows:
In above formula,WithFor the mains voltage signal for having phase offset of reconstruct.
S4, it is multiplied by the mains voltage signal for having phase offset of reconstruct with network voltage, and passes through low-pass filter
Obtain phase offset compensation matrix.
Have the mains voltage signal of phase offset and network voltage mutually multiplied by reconstruct:
DC component is obtained by low-pass filterWith
By obtaining phase offset compensation matrix after further unit compensation are as follows:
In above formula, CfFor phase offset compensation matrix, wherein
In above formula,WithFor DC component.
S5, by phase offset compensation matrix, have the voltage low frequency component and the not no electric current of phase offset of phase offset
Low frequency component calculates dq electric current.
By phase offset compensation matrix, the electric current low frequency of the voltage low frequency component that has phase offset, not no phase offset
Component calculates active power and reactive power, calculation formula are as follows:
In above formula, P is active power, and Q is reactive power；
Calculate Pulse rectifier instantaneous power, calculation formula are as follows:
Pass through simultaneous active power, the calculating of the calculation formula of reactive power (14) and Pulse rectifier instantaneous power
Formula (15) obtains dq electric current.
The calculation formula of dq electric current in the step S5 are as follows:
In above formula, id、iqFor electric current isDq current component, usdFor voltage on line side usIn the component of d axis；
As shown in figure 3, can detect under network voltage frequency shift (FS) reference frequency 1Hz and obtain correct dq electric current.Such as Fig. 4
Shown, network voltage frequency works under normal circumstances, can also detect to obtain correct dq electric current.As shown in figure 5, network voltage
When frequency is 51Hz, remains to detection and obtain correct dq electric current.
Fig. 3-Fig. 5 shows correctly obtain dq electric current when network voltage frequency has fluctuation have certain work
Cheng Yiyi.
Claims (6)
1. a kind of dq electric current detecting method of Pulse rectifier no phase-locked loop, which comprises the following steps:
S1, occur with reference to sinusoidal signal using controller and refer to cosine signal, with reference to sinusoidal signal and cosine signal will be referred to
It is multiplied respectively with the voltage and current of power grid, and voltage low frequency component and electric current low frequency component is obtained by productization and difference operation；
S2, the voltage low frequency component for having phase offset in voltage low frequency component is extracted by low-pass filter, pass through twice of power grid
The bandstop filter of frequency extracts electric current low frequency component and obtains the electric current low frequency component of not phase offset；
S3, triangulate decomposition method is carried out to the voltage low frequency component for having phase offset, with reference to sinusoidal signal and with reference to cosine signal
What is reconstructed has the mains voltage signal of phase offset；
S4, it is multiplied by the mains voltage signal for having phase offset of reconstruct with network voltage, and is obtained by low-pass filter
Phase offset compensation matrix；
S5, by phase offset compensation matrix, the electric current low frequency point of the voltage low frequency component that has phase offset, no phase offset
Amount and Pulse rectifier instantaneous power calculate dq electric current.
2. the dq electric current detecting method of Pulse rectifier no phase-locked loop according to claim 1, which is characterized in that institute
State the calculation formula of voltage low frequency component in step S1 are as follows:
In above formula, usFor the voltage on line side of Pulse rectifier,WithRespectively controller occurs
Reference sinusoidal signal and refer to cosine signal, ω0Fixed angular speed, ω are given for controller generation0=100 π are mains frequency pair
The angular speed answered, t are system local zone time, UsmFor the amplitude of voltage, α and β are intermediate variable,For cosine and sine signal for reference
Initial phase；
The calculation formula of electric current low frequency component are as follows:
In above formula, isFor the current signal of Pulse rectifier, IsmFor the amplitude of electric current, θ is electric current initial phase angle；
The voltage on line side u of Pulse rectifiersWith the current signal i of Pulse rectifiersCalculation formula are as follows:
In above formula, ω is power grid actual angular speed；
The calculation formula of α and β are as follows:
3. the dq electric current detecting method of Pulse rectifier no phase-locked loop according to claim 2, which is characterized in that institute
State the voltage low frequency component for having phase offset in step S2 are as follows:
In above formula, Ud_cosAnd Ud_sinTo there is the voltage low frequency component of phase offset,For the phase pushing figure of voltage low frequency component；
There is no the electric current low frequency component of phase offset are as follows:
In above formula, is_sinAnd is_cosFor the electric current low frequency component of not phase offset.
4. the dq electric current detecting method of Pulse rectifier no phase-locked loop according to claim 3, which is characterized in that institute
State the mains voltage signal for having phase offset reconstructed in step S3 are as follows:
In above formula,WithFor the mains voltage signal for having phase offset of reconstruct.
5. the dq electric current detecting method of Pulse rectifier no phase-locked loop according to claim 4, which is characterized in that institute
State phase offset compensation matrix in step S4 are as follows:
In above formula, CfFor phase offset compensation matrix, wherein
In above formula,WithFor DC component.
6. the dq electric current detecting method of Pulse rectifier no phase-locked loop according to claim 5, which is characterized in that institute
State the calculation formula of dq electric current in step S5 are as follows:
In above formula, id、iqFor electric current isDq current component, usdFor voltage on line side usIn the component of d axis；
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