CN109298234A - Reactive power detection device and method - Google Patents
Reactive power detection device and method Download PDFInfo
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- CN109298234A CN109298234A CN201710612474.5A CN201710612474A CN109298234A CN 109298234 A CN109298234 A CN 109298234A CN 201710612474 A CN201710612474 A CN 201710612474A CN 109298234 A CN109298234 A CN 109298234A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R21/00—Arrangements for measuring electric power or power factor
- G01R21/001—Measuring real or reactive component; Measuring apparent energy
- G01R21/003—Measuring reactive component
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R21/00—Arrangements for measuring electric power or power factor
- G01R21/06—Arrangements for measuring electric power or power factor by measuring current and voltage
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Abstract
The embodiment of the invention discloses a kind of reactive power detection device and methods.This method comprises: acquiring the current voltage and current flow of target tested point for the target tested point in the circuit under test in the subsystems in wind generator system；Determine current voltage and respective first component of current flow and second component, wherein second component is 90 ° of phase phase difference of component corresponding with the first component；Based on respective first component of current voltage and current flow and second component, the current reactive power of target tested point is calculated.The reactive power detection device and method of the embodiment of the present invention can reduce the calculation amount and error of reactive power detection, and improve the real-time of reactive power detection.
Description
Technical field
The present invention relates to technical field of electric power more particularly to a kind of reactive power detection device and methods.
Background technique
In power grid, by power supply load electrical power there are two types of: one is active power, another kind is idle function
Rate.Active power is to maintain the electrical power needed for electrical equipment operates normally, that is, converts electrical energy into other forms energy
The electrical power of (mechanical energy, luminous energy, thermal energy).Reactive power is to be used for circuit internal electric field and magnetic field, and be used in the electrical apparatus
Establish and maintain the electrical power in magnetic field.
Inappropriate reactive power will cause electric system, and place capacity increases in the process of running, equipment and route are damaged
The problems such as consumption is aggravated, overheat and line transmission pressure drop are excessive.These problems will directly affect the efficiency of transmission of electric energy, transmit
Increase unnecessary economic loss in link.Therefore, quickly and accurately detection reactive power is necessary.
Currently, for reactive power detected there are mainly two types of method: fourier mensuration and digital phase shift mensuration.Its
In, fourier mensuration be on tested circuit voltage signal, current signal according to uniform sampling complete cycle, then just with one group
It hands over trigonometric function (sinusoidal quantity or cosine amount) to carry out Orthogonal Decomposition according to Fourier space to sampled value, is calculated using each decomposition value
The reactive power of route.Digital phase shift mensuration is then to use voltage sampled value to voltage, electric current uniform sampling within the complete period
Multiplied by the current sampling data of 90 ° of points (1/4 period) of lag, integral calculation is done, to obtain the average reactive power in the complete period.
But reactive power is detected using fourier mensuration, calculation amount is larger.It is detected using digital phase shift mensuration idle
Power, real-time is poor, and if be measured there are multiple harmonic, the reactive power error detected is larger.
Summary of the invention
The embodiment of the present invention provides a kind of reactive power detection device and method, can reduce the calculating of reactive power detection
Amount and error and the real-time for improving reactive power detection.
On the one hand, the embodiment of the invention provides a kind of reactive power detection device, device include: voltage acquisition module,
Current acquisition module, phase shift block and computing module, wherein
Voltage acquisition module and current acquisition module, for for be measured in the subsystems in wind generator system
Target tested point in circuit respectively corresponds the current voltage and current flow of acquisition target tested point；
Phase shift block, for determining current voltage and/or respective first component of current flow and second component, wherein
Second component is 90 ° of phase phase difference of component corresponding with the first component；Phase shift block is for determining current voltage and described
Quantity when respective first component of current flow and second component is one, for determining that current voltage or current flow are each
From the first component and second component when quantity be two；
Computing module, for calculating target based on current voltage and respective first component of current flow and second component
The current reactive power of tested point.
On the other hand, the embodiment of the invention provides a kind of reactive power detection method, method includes:
For the target tested point in the circuit under test in the subsystems in wind generator system, it is to be measured to acquire target
The current voltage and current flow of point；
Determine current voltage and respective first component of current flow and second component, wherein second component be and first
The component of 90 ° of the corresponding phase phase difference of component；
Based on respective first component of current voltage and current flow and second component, the current nothing of target tested point is calculated
Function power.
The reactive power detection device and method of the embodiment of the present invention, fourier mensuration compared with the prior art calculate
It measures small；And digital phase shift mensuration compared with the prior art, the voltage and current of the embodiment of the present invention are current voltage
And current flow, calculated reactive power is current reactive power, rather than average reactive power, real-time are stronger；And
The reactive power detection method of the embodiment of the present invention, influence from harmonic is smaller, so that the reactive power error detected is smaller.
Detailed description of the invention
In order to illustrate the technical solution of the embodiments of the present invention more clearly, will make below to required in the embodiment of the present invention
Attached drawing is briefly described, for those of ordinary skill in the art, without creative efforts, also
Other drawings may be obtained according to these drawings without any creative labor.
Fig. 1 shows the flow diagram of reactive power detection method provided in an embodiment of the present invention；
Fig. 2 shows the first structural schematic diagrams of reactive power detection device provided in an embodiment of the present invention；
Fig. 3 shows second of structural schematic diagram of reactive power detection device provided in an embodiment of the present invention；
Fig. 4 shows the third structural schematic diagram of reactive power detection device provided in an embodiment of the present invention.
Specific embodiment
The feature and exemplary embodiment of various aspects of the invention is described more fully below, in order to make mesh of the invention
, technical solution and advantage be more clearly understood, with reference to the accompanying drawings and embodiments, the present invention is further retouched in detail
It states.It should be understood that specific embodiment described herein is only configured to explain the present invention, it is not configured as limiting the present invention.
To those skilled in the art, the present invention can be real in the case where not needing some details in these details
It applies.Below the description of embodiment is used for the purpose of better understanding the present invention to provide by showing example of the invention.
It should be noted that, in this document, relational terms such as first and second and the like are used merely to a reality
Body or operation are distinguished with another entity or operation, are deposited without necessarily requiring or implying between these entities or operation
In any actual relationship or order or sequence.Moreover, the terms "include", "comprise" or its any other variant are intended to
Non-exclusive inclusion, so that the process, method, article or equipment including a series of elements is not only wanted including those
Element, but also including other elements that are not explicitly listed, or further include for this process, method, article or equipment
Intrinsic element.In the absence of more restrictions, the element limited by sentence " including ... ", it is not excluded that including
There is also other identical elements in the process, method, article or equipment of the element.
As shown in Figure 1, Fig. 1 shows the flow diagram of reactive power detection method provided in an embodiment of the present invention.Its
May include:
S101: for the target tested point in the circuit under test in the subsystems in wind generator system, mesh is acquired
Mark the current voltage and current flow of tested point.
S102: current voltage and respective first component of current flow and second component are determined.
Wherein, second component is 90 ° of phase phase difference of component corresponding with the first component.
S103: based on current voltage and respective first component of current flow and second component, target tested point is calculated
Current reactive power.
Wherein, wind generator system includes wind-power electricity generation subsystem, wind-power electricity generation control subsystem, wind-power electricity generation protection
System and electric pitch-changing control subsystem etc..
Above-mentioned circuit under test can be single-phase circuit.
In one embodiment of the invention, current voltage and respective first component of current flow and second point are determined
Amount may include: the first difference of the first component of calculating current voltage and last collected voltage, and, current flow
With the second difference of the first component of last collected electric current；Calculate the of the first difference and last collected voltage
Two-component third difference, and, the 4th difference of the second component of the second difference and last collected electric current；Calculate third
First product value of the frequency of difference and circuit under test, and, the second product value of the frequency of the 4th difference and circuit under test；To
One product value carries out integral calculation and obtains first integral value, and, integral calculation is carried out to the second product value and obtains second integral value,
First component of the first integral value as current voltage, first component of the second integral value as current flow；To first integral
Value carries out integral calculation and obtains third integral value, and, integral calculation is carried out to second integral value and obtains the 4th integrated value；Calculate the
The third product value of three integrated values and frequency, and, the 4th product value of the 4th integral and frequency is calculated, third product value, which is used as, works as
The corresponding second component of preceding voltage, the 4th product value is as the corresponding second component of current flow.
Illustratively, it is illustrated by taking voltage as an example below.
Assuming that collected current voltage is u (t), last collected voltage is u0(t), last collected electricity
First component of pressure is uα0(t), the second component of last collected voltage is uβ0(t)。
Then the difference of the first component of current voltage and last collected voltage is u (t)-uα0(t)。
The of the difference of first component of current voltage and last collected voltage and last collected voltage
Two component uβ0(t) difference is u (t)-uα0(t)-uβ0(t)。
Assuming that the frequency of circuit under test is ω.
Then the first component u of current voltage and last collected voltageα0(t) difference and last collected electricity
The second component u of pressureβ0(t) product of the frequencies omega of difference and circuit under test is ω (u (t)-uα0(t)-uβ0(t))。
ω (u (t)-u is calculated by Laplace transformα0(t)-uβ0(t)) integral makees the integrated value being calculated
For the first component of current voltage.
Wherein, Laplace transform is commonly a kind of integral transformation also known as Laplace transformation in engineering mathematics.Laplce
Transformation is a linear transformation, is that the function that one has parameter real number t is converted to the function that a parameter is plural number s.
The first representation in components of current voltage u (t) is as follows:
Wherein, UαIt (s) be current voltage u (t) with parameter is the first component that plural number s is indicated, ω is circuit under test
Frequency, s are Laplace transform operator, U (s) be current voltage u (t) it is corresponding with parameter be current voltage that plural number s is indicated.
U is calculated by Laplace transformα(s) integral, then calculate the integrated value that is obtained by integral calculation with it is to be measured
The product of the frequencies omega of circuit, using the product value being calculated as the second component of current voltage.
The second component of current voltage u (t) is expressed as follows:
Wherein, UβIt (s) be current voltage u (t) with parameter is second component that plural number s is indicated, ω is circuit under test
Frequency, s are Laplace transform operator, U (s) be current voltage u (t) it is corresponding with parameter be current voltage that plural number s is indicated.
Near s=j ω, wherein j is phase shift operator, is had
Uβ(s)=s*Uα(s) (3)
That is Uβ(s) compare Uα(s) 90 ° are lagged.It can obtain that two amplitudes are identical, frequency is equal but phase by the above process
90 ° of phase difference of two output quantity Uα(s) and Uβ(s), 90 ° of phase shift of effect is realized.
Calculate current flow the first component and second component process and above-mentioned calculating current voltage the first component and
The process of second component is identical, and the embodiment of the present invention does not repeat it herein, specifically can be currently electric with reference to above-mentioned calculating
First component of pressure and the process of second component.
The first representation in components of current flow i (t) is as follows:
The second component of current flow i (t) is expressed as follows:
Wherein, IαIt (s) be current flow i (t) with parameter is the first component that plural number s is indicated, Iβ(s is current flow I
(t) the second component indicated with parameter for plural number s, ω are the frequency of circuit under test, and s is Laplace transform operator, I (s)
For current flow i (t) it is corresponding with parameter be current flow that plural number s is indicated.
In one embodiment of the invention, the second component of the first difference and upper primary collected voltage is being calculated
Third difference, and, before the 4th difference of the second component of the second difference and last collected electric current, can also include:
By the first difference and/or the second difference multiplied by the first difference and/or the second difference after being adjusted after predetermined value.
Illustratively, it is illustrated by taking voltage as an example below.
Assuming that collected current voltage is u (t), last collected voltage is u0(t), last collected electricity
First component of pressure is uα0(t), the second component of last collected voltage is uβ0(t)。
Then the difference of the first component of current voltage and last collected voltage is u (t)-uα0(t)。
The difference is adjusted using regulation coefficient k, i.e., by u (t)-uα0(t) product calculation is carried out with predetermined value k, adjusted
Difference after whole is k (u (t)-uα0(t)).In one embodiment of the invention, k can be greater than 0 and be not more than 1.
The second component u of difference adjusted and last collected voltageβ0(t) difference is k (u (t)-uα0
(t))-uβ0(t)。
Assuming that the frequency of circuit under test is ω.
Then k (u (t)-uα0(t))-uβ0It (t) is ω (k (u (t)-u with the product of the frequencies omega of circuit under testα0(t))-uβ0
(t))。
ω (k (u (t)-u is calculated by Laplace transformα0(t))-uβ0(t)) integral, the integrated value that will be calculated
The first component as current voltage.
The first representation in components of current voltage u (t) is as follows:
Wherein, UαIt (s) be current voltage u (t) with parameter is the first component that plural number s is indicated, ω is circuit under test
Frequency, s are Laplace transform operator, U (s) be current voltage u (t) it is corresponding with parameter be current voltage that plural number s is indicated,
K is regulation coefficient, and k is greater than 0 and is not more than 1.
U is calculated by Laplace transformα(s) integral, then calculate the integrated value that is obtained by integral calculation with it is to be measured
The product of the frequencies omega of circuit, using the product value being calculated as the second component of current voltage.
The second component of current voltage u (t) is expressed as follows:
Wherein, UβIt (s) be current voltage u (t) with parameter is second component that plural number s is indicated, ω is circuit under test
Frequency, s are Laplace transform operator, U (s) be current voltage u (t) it is corresponding with parameter be current voltage that plural number s is indicated,
K is regulation coefficient.
Near s=j ω, wherein j is phase shift operator, is had
Uβ(s)=s*Uα(s) (8)
That is Uβ(s) compare Uα(s) 90 ° are lagged.It can obtain that two amplitudes are identical, frequency is equal but phase by the above process
90 ° of phase difference of two output quantity Uα(s) and Uβ(s), 90 ° of phase shift of effect is realized.
Wherein, the first difference is adjusted the adjustment of coefficient, and calculated result can be made more accurate.
Calculate current flow the first component and second component process and above-mentioned calculating current voltage the first component and
The process of second component is identical, and the embodiment of the present invention does not repeat it herein, specifically can be currently electric with reference to above-mentioned calculating
First component of pressure and the process of second component.
The first representation in components of current flow i (t) is as follows:
The second component of current flow i (t) is expressed as follows:
Wherein, IαIt (s) be current flow i (t) with parameter is the first component that plural number s is indicated, Iβ(s is current flow i
(t) the second component indicated with parameter for plural number s, ω are the frequency of circuit under test, and s is Laplace transform operator, I (s)
For current flow i (t) it is corresponding with parameter be current flow that plural number s is indicated, k is regulation coefficient.
In one embodiment of the invention, based on current voltage and respective first component of current flow and second point
Amount calculates the current reactive power of target tested point, may include: calculate current voltage second component and current flow the
The difference of the product of the second component of the product of one component and the first component of current voltage and current flow, will be calculated
Current reactive power of the difference as target tested point.
Q=Uβ(s)*Iα(s)-Uα(s)*Iβ(s) (11)
Wherein, q is the current reactive power of target tested point, Uα(s)、Uβ(s)、Iα(s) and IβIt (s) is respectively current electricity
Press u (t) and respective first component of current flow i (t) and second component.
The reactive power detection method of the embodiment of the present invention, fourier mensuration compared with the prior art, calculation amount are small；And
And digital phase shift mensuration compared with the prior art, the voltage and current of the embodiment of the present invention are current voltage and current electricity
Stream, calculated reactive power is current reactive power, rather than average reactive power, real-time are stronger；And the present invention is real
The reactive power detection method of example is applied, influence from harmonic is smaller, so that the reactive power error detected is smaller.
Corresponding with above-mentioned embodiment of the method, the embodiment of the present invention also provides a kind of reactive power detection device.
As shown in Fig. 2, Fig. 2 shows the first structural representations of reactive power detection device provided in an embodiment of the present invention
Figure.It may include: voltage acquisition module 201, current acquisition module 202, phase shift block 203 and computing module 204, wherein
Voltage acquisition module 201, for for the mesh in the circuit under test in the subsystems in wind generator system
Tested point is marked, the current voltage of target tested point is acquired.
Current acquisition module 202, for for the mesh in the circuit under test in the subsystems in wind generator system
Tested point is marked, the current voltage of target tested point is acquired.
Phase shift block 203, for determining current voltage and respective first component of current flow and second component, wherein
Second component is 90 ° of phase phase difference of component corresponding with the first component.
It should be noted that when being used to determine current voltage and respective first component of current flow and second component,
The quantity of phase shift block is one；When being used to determine current voltage or respective first component of current flow and second component,
The quantity of phase shift block is two.
Computing module 203, for calculating mesh based on current voltage and respective first component of current flow and second component
Mark the current reactive power of tested point.
Wherein, wind generator system includes wind-power electricity generation subsystem, wind-power electricity generation control subsystem, wind-power electricity generation protection
System and electric pitch-changing control subsystem etc..
In one embodiment of the invention, the phase shift block 202 of the embodiment of the present invention may include: that phase shift block includes
First component difference computational submodule, second component difference computational submodule, the first product computational submodule, first integral calculate
Submodule, second integral computational submodule and the second product computational submodule (not shown)；Wherein,
First component difference computational submodule, for calculating the first component of current voltage and last collected voltage
The first difference, and/or, calculate the second difference of the first component of current flow and last collected electric current.
Second component difference computational submodule, for calculating the second component of the first difference and last collected voltage
Third difference, and/or, calculate the 4th difference of the second component of the second difference and last collected electric current.
First product computational submodule, the first product value of the frequency for calculating third difference and circuit under test, and/
Or, calculating the second product value of the frequency of the 4th difference and circuit under test.
First integral computational submodule obtains first integral value for carrying out integral calculation to the first product value, and/or,
Integral calculation is carried out to the second product value and obtains second integral value, first component of the first integral value as current voltage, second
First component of the integrated value as current flow.
Second integral computational submodule obtains third integral value for carrying out integral calculation to first integral value, and/or,
Integral calculation is carried out to second integral value and obtains the 4th integrated value.
Second product computational submodule, for calculating the third product value of third integral value and frequency, and/or, calculate the
4th product value of four integrals and frequency, third product value is as the corresponding second component of current voltage, the 4th product value conduct
The corresponding second component of current flow.
Illustratively, it is illustrated by taking voltage as an example below.
Assuming that the collected current voltage of voltage acquisition module 201 is u (t)；Last collected voltage is u0(t),
First component of last collected voltage is uα0(t), the second component of last collected voltage is uβ0(t)。
First component difference computational submodule calculates the difference of the first component of current voltage and last collected voltage
Value is u (t)-uα0(t)。
Second component difference computational submodule calculates the difference of the first component of current voltage and last collected voltage
The second component u of value and last collected voltageβ0(t) difference is u (t)-uα0(t)-uβ0(t)。
Assuming that the frequency of circuit under test is ω.
Then the first product computational submodule calculates u (t)-uα0(t)-uβ0It (t) is ω with the product of the frequencies omega of circuit under test
(u(t)-uα0(t)-uβ0(t))。
First integral computational submodule calculates ω (u (t)-u by Laplace transformα0(t)-uβ0(t)) integral, will
First component of the integrated value being calculated as current voltage.
The first representation in components of current voltage u (t) is as follows:
Wherein, UαIt (s) be current voltage u (t) with parameter is the first component that plural number s is indicated, ω is circuit under test
Frequency, s are Laplace transform operator, U (s) be current voltage u (t) it is corresponding with parameter be current voltage that plural number s is indicated.
Second integral computational submodule calculates U by Laplace transformα(s) integral.
Second product computational submodule calculate the integrated value that obtains by second integral computational submodule integral calculation with to
The product of the frequencies omega of slowdown monitoring circuit, using the product value being calculated as the second component of current voltage.
The second component of current voltage u (t) is expressed as follows:
Wherein, UβIt (s) be current voltage u (t) with parameter is second component that plural number s is indicated, ω is circuit under test
Frequency, s are Laplace transform operator, U (s) be current voltage u (t) it is corresponding with parameter be current voltage that plural number s is indicated.
Near s=j ω, wherein j is phase shift operator, is had
Uβ(s)=s*Uα(s) (14)
That is Uβ(s) compare Uα(s) 90 ° are lagged.It can obtain that two amplitudes are identical, frequency is equal but phase by the above process
90 ° of phase difference of two output quantity Uα(s) and Uβ(s), 90 ° of phase shift of effect is realized.
Calculate current flow the first component and second component process and above-mentioned calculating current voltage the first component and
The process of second component is identical, and the embodiment of the present invention does not repeat it herein, specifically can be currently electric with reference to above-mentioned calculating
First component of pressure and the process of second component.
The first representation in components of current flow i (t) is as follows:
The second component of current flow i (t) is expressed as follows:
Wherein, IαIt (s) be current flow i (t) with parameter is the first component that plural number s is indicated, IβIt (s) is current flow i
(t) the second component indicated with parameter for plural number s, ω are the frequency of circuit under test, and s is Laplace transform operator, I (s)
For current flow i (t) it is corresponding with parameter be current flow that plural number s is indicated.
In one embodiment of the invention, the phase shift block 203 of the embodiment of the present invention can also include: adjustment submodule
Block, for first difference and/or second after being adjusted the first difference and/or the second difference later multiplied by predetermined value
Difference, and first difference adjusted and/or the second difference are exported to the second component difference computational submodule.
Illustratively, it is illustrated by taking voltage as an example below.
Assuming that the collected current voltage of voltage acquisition module 201 is u (t), last collected voltage is u0(t),
First component of last collected voltage is uα0(t), the second component of last collected voltage is uβ0(t)。
First component difference computational submodule calculates the difference of the first component of current voltage and last collected voltage
Value is u (t)-uα0(t)。
Adjusting submodule is to difference u (t)-uα0(t) it is adjusted using regulation coefficient k, i.e., by u (t)-uα0(t) and it is predetermined
Value k carries out product calculation, and difference adjusted is k (u (t)-uα0(t)).In one embodiment of the invention, k can be greater than 0
And it is not more than 1.
Second component difference computational submodule calculates k (u (t)-uα0(t)) with the second component of last collected voltage
uβ0(t) difference is k (u (t)-uα0(t))-uβ0(t)。
Assuming that the frequency of circuit under test is ω.
Then the first product computational submodule calculates k (u (t)-uα0(t))-uβ0(t) with the product of the frequencies omega of circuit under test
For ω (k (u (t)-uα0(t))-uβ0(t))。
First integral computational submodule calculates ω (k (u (t)-u by Laplace transformα0(t))-uβ0(t)) integral,
Using the integrated value being calculated as the first component of current voltage.
The first representation in components of current voltage u (t) is as follows:
Wherein, UαIt (s) be current voltage u (t) with parameter is the first component that plural number s is indicated, ω is circuit under test
Frequency, s are Laplace transform operator, U (s) be current voltage u (t) it is corresponding with parameter be current voltage that plural number s is indicated,
K is regulation coefficient, and k is greater than 0 and is not more than 1.
Second integral computational submodule calculates U by Laplace transformα(s) integral.
Second product computational submodule calculate again the integrated value that obtains by second integral computational submodule integral calculation with
The product of the frequencies omega of circuit under test, using the product value being calculated as the second component of current voltage.
The second component of current voltage u (t) is expressed as follows:
Wherein, UβIt (s) be current voltage u (t) with parameter is second component that plural number s is indicated, ω is circuit under test
Frequency, s are Laplace transform operator, U (s) be current voltage u (t) it is corresponding with parameter be current voltage that plural number s is indicated,
K is regulation coefficient.
Near s=j ω, wherein j is phase shift operator, is had
Uβ(s)=s*Uα(s) (19)
That is Uβ(s) compare Uα(s) 90 ° are lagged.It can obtain that two amplitudes are identical, frequency is equal but phase by the above process
90 ° of phase difference of two output quantity Uα(s) and Uβ(s), 90 ° of phase shift of effect is realized.
Wherein, the first difference is adjusted the adjustment of submodule, and calculated result can be made more accurate.
Calculate current flow the first component and second component process and above-mentioned calculating current voltage the first component and
The process of second component is identical, and the embodiment of the present invention does not repeat it herein, specifically can be currently electric with reference to above-mentioned calculating
First component of pressure and the process of second component.
The first representation in components of current flow i (t) is as follows:
The second component of current flow i (t) is expressed as follows:
Wherein, IαIt (s) be current flow i (t) with parameter is the first component that plural number s is indicated, IβIt (s) is current flow i
(t) the second component indicated with parameter for plural number s, ω are the frequency of circuit under test, and s is the plural number ginseng of Laplace transform
Number, I (s) be current flow i (t) it is corresponding with parameter be current flow that plural number s is indicated, k is regulation coefficient.
In one embodiment of the invention, the computing module 203 of the embodiment of the present invention may further be used for: calculating is worked as
The of the product of the first component and the first component of current voltage of the second component and current flow of preceding voltage and current flow
The difference of two-component product, using the difference being calculated as the current reactive power of target tested point.
Q=Uβ(s)*Iα(s)-Uα(s)*Iβ(s) (22)
Wherein, q is the current reactive power of target tested point, Uα(s)、Uβ(s)、Iα(s) and IβIt (s) is respectively current electricity
Press u (t) and respective first component of current flow i (t) and second component.
The reactive power detection device of the embodiment of the present invention, fourier mensuration compared with the prior art, calculation amount are small；And
And digital phase shift mensuration compared with the prior art, the voltage and current of the embodiment of the present invention are current voltage and current electricity
Stream, calculated reactive power is current reactive power, rather than average reactive power, real-time are stronger；And the present invention is real
The reactive power detection device of example is applied, influence from harmonic is smaller, so that the reactive power error detected is smaller.Therefore, this hair
The reactive power detection device of bright embodiment can reduce the calculation amount and error of reactive power detection, and improve idle function
The real-time of rate detection.
In addition, Fig. 3 shows reactive power detection device provided in an embodiment of the present invention in conjunction with the description of Fig. 1 and Fig. 2
Second of structural schematic diagram.Wherein, voltage acquisition module 201 can be voltage collector；Current acquisition module 202 can be electricity
Flow collector；Phase shift block can be two, respectively voltage phase shift block and electric current phase shift block.
The first component difference computational submodule, the second component difference computational submodule, first that voltage phase shift block includes
Product computational submodule, first integral computational submodule, second integral computational submodule and the second product computational submodule difference
For the first subtracter, the second subtracter, the first multiplier, first integrator, second integral device and the second multiplier.
The first component difference computational submodule, the second component difference computational submodule, first that electric current phase shift block includes
Product computational submodule, first integral computational submodule, second integral computational submodule and the second product computational submodule difference
For third subtracter, the 4th subtracter, third multiplier, third integral device, the 4th integrator and the 4th multiplier.
The computing module 203 of the embodiment of the present invention may include: for calculating the second component of current voltage and current electricity
One multiplier of the product of the first component of stream, i.e. the 5th multiplier shown in Fig. 3；For calculating the first of current voltage
Another multiplier of the product of the second component of component and current flow, i.e. the 6th multiplier shown in Fig. 3；For calculating
The product of the first component and the first component of current voltage of the second component and current flow of current voltage and current flow
The subtracter of the difference of the product of second component, i.e. the 5th multiplier shown in Fig. 3.
The acquisition of the input terminal of voltage collector and current collector is in the subsystems in wind generator system
The current voltage and current flow of target tested point in circuit under test.
The subtracting input and minuend input terminal of first subtracter are long-pending with the output end of voltage collector and first respectively
The output end of device is divided to be connected.
The subtracting input and minuend input terminal of second subtracter are defeated with the first subtracter and the second multiplier respectively
Outlet is connected.
One input terminal of the first multiplier is connected with the output end of the second subtracter, another input of the first multiplier
End receives the frequency of circuit under test.
The input with the output end of the first multiplier and second integral device respectively of the input terminal and output end of first integrator
End is connected.
One input terminal of the second multiplier is connected with the output end of second integral device, another input of the second multiplier
End receives the frequency of circuit under test.
The subtracting input and minuend input terminal of third subtracter are long-pending with the output end of current collector and third respectively
The output end of device is divided to be connected.
The subtracting input and minuend input terminal of 4th subtracter are defeated with third subtracter and the 4th multiplier respectively
Outlet is connected.
One input terminal of third multiplier is connected with the output end of the 4th subtracter, another input of third multiplier
End receives the frequency of circuit under test.
The input with the output end of third multiplier and third integral device respectively of the input terminal and output end of third integral device
End is connected.
One input terminal of the 4th multiplier is connected with the output end of the 4th integrator, another input of the 4th multiplier
End receives the frequency of circuit under test.
Two input terminals of the 5th multiplier are connected with the output end of the second multiplier and third integral device respectively.
Two input terminals of the 6th multiplier are connected with the output end of the 4th multiplier and first integrator respectively.
The subtracting input and minuend input terminal of 5th subtracter are defeated with the 5th multiplier and the 6th multiplier respectively
Outlet is connected.
The output end of 5th subtracter exports the reactive power being calculated.
Reactive power detection device provided in an embodiment of the present invention, fourier mensuration compared with the prior art, calculation amount
It is small；And digital phase shift mensuration compared with the prior art, the voltage and current of the embodiment of the present invention be current voltage and
Current flow, calculated reactive power is current reactive power, rather than average reactive power, real-time are stronger；And this
The reactive power detection method of inventive embodiments, influence from harmonic is smaller, so that the reactive power error detected is smaller.
In one embodiment of the invention, adjusting submodule can be amplifier.
In one embodiment of the invention, voltage phase shift block can also include the first amplifier.
In one embodiment of the invention, electric current phase shift block can also include the second amplifier.
Certainly, in one embodiment of the invention, voltage phase shift block can also include the first amplifier, and electric current moves
Phase module can also include the second amplifier.As shown in figure 4, Fig. 4 shows reactive power detection provided in an embodiment of the present invention
The third structural schematic diagram of device.On the basis of embodiment illustrated in fig. 4 embodiment shown in Fig. 3 of the present invention, voltage phase shift mould
Block further includes the first amplifier, and electric current phase shift block further includes the second amplifier.
In one embodiment of the invention, the amplification coefficient of the first above-mentioned amplifier and the second amplifier can be big
In 0 and be not more than 1.
Reactive power detection device provided in an embodiment of the present invention, fourier mensuration compared with the prior art, calculation amount
It is small；And digital phase shift mensuration compared with the prior art, the voltage and current of the embodiment of the present invention be current voltage and
Current flow, calculated reactive power is current reactive power, rather than average reactive power, real-time are stronger；And this
The reactive power detection method of inventive embodiments, influence from harmonic is smaller, so that the reactive power error detected is smaller.And
It can be further improved the accuracy of reactive power detection based on amplifier.
It should be clear that the invention is not limited to specific configuration described above and shown in figure and processing.
For brevity, it is omitted here the detailed description to known method.In the above-described embodiments, several tools have been described and illustrated
The step of body, is as example.But method process of the invention is not limited to described and illustrated specific steps, this field
Technical staff can be variously modified, modification and addition after understanding spirit of the invention, or suitable between changing the step
Sequence.
Functional block shown in structures described above block diagram can be implemented as hardware, software, firmware or their group
It closes.When realizing in hardware, it may, for example, be electronic circuit, specific integrated circuit (ASIC), firmware appropriate, insert
Part, function card etc..When being realized with software mode, element of the invention is used to execute program or the generation of required task
Code section.Perhaps code segment can store in machine readable media program or the data-signal by carrying in carrier wave is passing
Defeated medium or communication links are sent." machine readable media " may include any medium for capableing of storage or transmission information.
The example of machine readable media includes electronic circuit, semiconductor memory devices, ROM, flash memory, erasable ROM (EROM), soft
Disk, CD-ROM, CD, hard disk, fiber medium, radio frequency (RF) link, etc..Code segment can be via such as internet, inline
The computer network of net etc. is downloaded.
It should also be noted that, the exemplary embodiment referred in the present invention, is retouched based on a series of step or device
State certain methods or system.But the present invention is not limited to the sequence of above-mentioned steps, that is to say, that can be according in embodiment
The sequence referred to executes step, may also be distinct from that the sequence in embodiment or several steps are performed simultaneously.
The above description is merely a specific embodiment, it is apparent to those skilled in the art that,
For convenience of description and succinctly, the system, module of foregoing description and the specific work process of unit can refer to preceding method
Corresponding process in embodiment, details are not described herein.It should be understood that scope of protection of the present invention is not limited thereto, it is any to be familiar with
Those skilled in the art in the technical scope disclosed by the present invention, can readily occur in various equivalent modifications or substitutions,
These modifications or substitutions should be covered by the protection scope of the present invention.
Claims (10)
1. a kind of reactive power detection device, which is characterized in that described device include: voltage acquisition module, current acquisition module,
Phase shift block and computing module, wherein
The voltage acquisition module and the current acquisition module, for in the subsystems in wind generator system
Target tested point in circuit under test respectively corresponds the current voltage and current flow for acquiring the target tested point；
The phase shift block, for determining the current voltage and/or respective first component of the current flow and second point
Amount, wherein the second component is 90 ° of phase phase difference of component corresponding with first component；The phase shift block with
Quantity when determining the current voltage and respective first component of the current flow and second component is one, is being used for
Determine that the quantity when current voltage or respective first component of the current flow and second component is two；
The computing module, for being based on the current voltage and respective first component of the current flow and second component,
Calculate the current reactive power of the target tested point.
2. the apparatus according to claim 1, which is characterized in that the phase shift block includes that the first component difference calculates submodule
Block, second component difference computational submodule, the first product computational submodule, first integral computational submodule, second integral calculate
Submodule and the second product computational submodule；Wherein,
The first component difference computational submodule, for calculating the first of the current voltage and last collected voltage
First difference of component, and/or, calculate the first component of the current flow and last collected electric current second is poor
Value；
The second component difference computational submodule, for calculating first difference and the last time collected voltage
The third difference of second component, and/or, calculate the second component of second difference and the last time collected electric current
4th difference；
The first product computational submodule, the first product of the frequency for calculating the third difference and the circuit under test
Value, and/or, calculate the second product value of the frequency of the 4th difference and the circuit under test；
The first integral computational submodule obtains first integral value for carrying out integral calculation to first product value, and/
Or, carrying out integral calculation to second product value obtains second integral value, the first integral value is as the current voltage
The first component, first component of the second integral value as the current flow；
The second integral computational submodule obtains third integral value for carrying out integral calculation to the first integral value, and/
Or, carrying out integral calculation to the second integral value obtains the 4th integrated value；
The second product computational submodule, for calculating the third product value of the third integral value Yu the frequency, and/
Or, calculating the 4th product value of the 4th integral and the frequency, the third product value is corresponding as the current voltage
Second component, the 4th product value is as the corresponding second component of the current flow.
3. the apparatus of claim 2, which is characterized in that the phase shift block further includes adjusting submodule, and being used for will
First difference and/or second difference are multiplied by first difference after being adjusted after predetermined value and/or described
Second difference, and first difference adjusted and/or second difference are exported to the second component difference and calculated
Submodule.
4. according to claim 1 to device described in 3 any one, which is characterized in that the computing module is further used for:
Calculate the second component of the current voltage and the first component of the current flow product and the current voltage
The difference of the product of the second component of first component and the current flow, is waited for the difference being calculated as the target
The current reactive power of measuring point.
5. device according to claim 3, which is characterized in that the voltage acquisition module, the current acquisition module, institute
State the first component difference computational submodule, the second component difference computational submodule, the first product computational submodule, institute
State first integral computational submodule, the second integral computational submodule, the second product computational submodule and the adjustment
Submodule respectively corresponds as voltage collector, current collector, the first subtracter, the second subtracter, the first multiplier, the first product
Divide device, second integral device, the second multiplier and amplifier.
6. device according to claim 4, which is characterized in that the computing module includes:
For calculating a multiplier of the product of the second component of the current voltage and the first component of the current flow；
For calculating another multiplication of the product of the first component of the current voltage and the second component of the current flow
Device；
For calculate the second component of the current voltage and the first component of the current flow product and the current electricity
The subtracter of the difference of the product of the second component of the first component and current flow of pressure.
7. a kind of reactive power detection method, which is characterized in that the described method includes:
For the target tested point in the circuit under test in the subsystems in wind generator system, it is to be measured to acquire the target
The current voltage and current flow of point；
Determine the current voltage and respective first component of the current flow and second component, wherein the second component
For 90 ° of phase phase difference of component corresponding with first component；
Based on the current voltage and respective first component of the current flow and second component, the target tested point is calculated
Current reactive power.
8. the method according to the description of claim 7 is characterized in that the determination current voltage and the current flow are each
From the first component and second component, comprising:
The first difference of the first component of the current voltage and last collected voltage is calculated, and, the current flow
With the second difference of the first component of last collected electric current；
The third difference of the second component of first difference and the last time collected voltage is calculated, and, described second
4th difference of the second component of difference and the last time collected electric current；
Calculate the first product value of the frequency of the third difference and the circuit under test, and, the 4th difference and it is described to
Second product value of the frequency of slowdown monitoring circuit；
Integral calculation is carried out to first product value and obtains first integral value, and, integrating meter is carried out to second product value
Calculation obtains second integral value, first component of the first integral value as the current voltage, the second integral value conduct
First component of the current flow；
Integral calculation is carried out to the first integral value and obtains third integral value, and, integrating meter is carried out to the second integral value
Calculation obtains the 4th integrated value；
The third product value of the third integral value Yu the frequency is calculated, and, calculate the 4th integral and the frequency
4th product value, the third product value is as the corresponding second component of the current voltage, and the 4th product value is as institute
State the corresponding second component of current flow.
9. according to the method described in claim 8, it is characterized in that, calculating first difference described and upper once being adopted with described
The third difference of the second component of the voltage collected, and, the second of second difference and the last time collected electric current
Before 4th difference of component, further includes:
By first difference and/or the second difference multiplied by first difference and/or the after being adjusted after predetermined value
Two differences.
10. according to method described in claim 7 to 9 any one, which is characterized in that described to be based on the current voltage and institute
Respective first component of current flow and second component are stated, the current reactive power of the target tested point is calculated, comprising:
Calculate the second component of the current voltage and the first component of the current flow product and the current voltage
The difference of the product of the second component of first component and the current flow, is waited for the difference being calculated as the target
The current reactive power of measuring point.
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