CN108459202A - A kind of high-precision detecting method of active power and reactive power - Google Patents
A kind of high-precision detecting method of active power and reactive power Download PDFInfo
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- CN108459202A CN108459202A CN201711356842.0A CN201711356842A CN108459202A CN 108459202 A CN108459202 A CN 108459202A CN 201711356842 A CN201711356842 A CN 201711356842A CN 108459202 A CN108459202 A CN 108459202A
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- power
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- inductive current
- reactive power
- active power
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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 invention discloses the high-precision detecting methods of a kind of active power and reactive power.This method is mainly：1) active power and reactive power are calculated instead of output current using inductive current, even if since there are reactive current, inductive current is not 0, it is ensured that the accuracy that reactive power calculates under unloaded or small loading condition.2) there are the ripples of switch periods, the sampling instant of inductive current will generate significant impact to the precision of power calculation, the precision of power calculation is significantly improved using the double instance samples of inductive current Wave crest and wave trough for inductive current.Voltage source parallel current-sharing under this method effective solution is unloaded or small loading condition there are the problem of, the considerable reliability for improving voltage source converter.
Description
Technical field
The invention belongs to power electronics control fields, are related to a kind of follow-on active power and idle computational methods,
It is particularly suitable for the equal flow algorithm of voltage source converter mean power.
Background technology
Either industry spot application or power grid field application have very more alternating-current voltage source parallel connection applications, such as
UPS is exactly a very typical voltage source converter, it usually needs multiple UPS modules carry out parallel connection, and be bound to voltage to be solved
The circulation problem of source parallel connection.The most commonly used equal flow algorithm of current application is that active power, reactive power based on CAN bus are equal
Flow algorithm, this algorithm only need the connecting of CAN communication line, not too large influence voltage source regulation, so using most
To be extensive, advantage is the most apparent.
But in unloaded or low-power load, voltage source output current very little, since the precision of current sensor limits,
There are large errors for the output current signal measured, cause active or wattless power measurement result inaccurate, to cause to flow
Control performance declines, or even occurs causing DC bus-bar voltage excessively high due to active power circulation, and power device is caused when serious
Damage.So active power when unloaded and low-power load, there is an urgent need to be resolved for the detection accuracy problem of reactive power.
Invention content
It is asked to solve prior art detection active power, the accuracy of reactive power in unloaded and low-power load
Topic, the present invention propose a kind of high-precision detecting method of active power and reactive power.
Scheme is as follows：
The high-precision detecting method is in the double instance samples of inductive current Wave crest and wave trough, by detecting inductive current iL, defeated
Go out voltage uo, the average active power and average reactive power of output current is calculated.
Specifically include following steps：
A. sample clock generator underflow is interrupted, sampling inductive current il1 (k)；
B. sample clock generator cycle interruption, sampling inductive current il2 (k), sampling and outputting voltage Uo (k)；
C. discretization active power calculating is carried out.
D. discretization reactive power calculating is carried out.
The invention has the advantages that：
The present invention calculates active power and reactive power using inductive current instead of output current, though unloaded or
Since there are reactive current, inductive current is not 0, it is ensured that the accuracy that reactive power calculates under small loading condition.
There are the ripple of switch periods, the sampling instant of inductive current will generate the precision of power calculation to be shown inductive current
The influence of work, the present invention significantly improve the precision of power calculation using the double instance samples of inductive current Wave crest and wave trough.
The present invention solves the problems, such as that the voltage source parallel current-sharing under unloaded or small loading condition exists, appreciably
Improve the reliability of voltage source converter.
Description of the drawings
Fig. 1 is the topological diagram of single-phase electricity source converter, illustrates to calculate active power and nothing using output current in figure
The traditional scheme of work(power.
Fig. 2 is the topological diagram of single-phase electricity source converter, illustrates to calculate active power and nothing using inductive current in figure
The present invention program of work(power.
Fig. 3 is corresponding output voltage, output current and filter inductance current waveform of the invention.
Specific implementation mode
The present invention is described in more detail with attached drawing With reference to embodiment：
It is the topological diagram of single-phase electricity source converter as shown in Figure 1, by detecting output current io, output voltage uo, meter
Calculate average active power, the average reactive power of output current.
Specific implementation and error analysis when unloaded or small load：
Assuming that voltage source output voltage is：uo=Usin (ω t), output current are：io=Iosin(ωt-φ)。
The active power of output is：
The reactive power of output is：
From rating formula above it can easily be shown that in unloaded or low-power load, output current io is very
Small, since the precision of current sensor limits, there are large errors for the output current signal measured, cause active or reactive power
Measurement result is inaccurate, to cause sharing control performance to decline, or even occurs leading to DC bus due to active power circulation
Overtension causes power device to damage when serious
It is illustrated in figure 2 the topological diagram of single-phase electricity source converter, by detecting inductive current iL, output voltage uo, meter
Calculate average active power, the average reactive power of output current.
Inductive current iL is：
Active power is：
Reactive power is：
As can be seen from the above equation, the active power calculated using inductive current and the active power calculated using output current
It is identical, but use the reactive power that inductive current calculates to differ an output with the reactive power calculated using output current and filter
Reactive power component on wave capacitance is in unloaded and underloading, since capacitive reactive power exists always, using inductive current meter
The more accurate of reactive power of calculation
There are the ripple of switch periods, the sampling instant of inductive current will generate the precision of power calculation to be shown inductive current
The influence of work.The computational accuracy of active power and reactive power and inductive current sampling instant are closely related, by changing inductance
The current sample moment can significantly improve the precision of power calculation.Pass through double instance samples of wave crest and trough, averaged
Method, true inductive current instantaneous value can be restored to greatest extent.It, can also in the case of controller resource abundance
The even number of samples point for increasing a switch periods can continue the precision for improving inductance instantaneous value.
It is corresponding output voltage, output current and filter inductance current waveform of the invention as shown in Figure 3, wherein improving
Active power, the careful computational methods of reactive power calculating of type are as follows：
It is 2 inductive current of sampling instant that wherein il1 (k), which is 1 inductive current of sampling instant, il2 (k),.Uo (t) is output electricity
Corrugating, iL (t) are inductive current, wherein the switch containing larger composition time ripple.
Steps are as follows for specific implementation：
A. controller sample clock generator underflow is interrupted, sampling inductive current il1 (k).
B. controller sample clock generator cycle interruption, sampling inductive current il2 (k), sampling and outputting voltage Uo (k), because
Carrier wave ratio is very big, it is believed that output voltage does not change substantially when underflow is interrupted with cycle interruption.
C. discretization active power calculating is carried out.
Calculation formula is as follows：
D. discretization reactive power calculating is carried out.
Calculation formula is as follows：
Claims (2)
1. the high-precision detecting method of a kind of active power and reactive power, it is characterised in that：It is double in inductive current Wave crest and wave trough
The average active power of output current and average nothing is calculated by detecting inductive current iL, output voltage uo in instance sample
Work(power.
2. the high-precision detecting method of active power according to claim 1 and reactive power, which is characterized in that specific packet
Include following steps：
A. sample clock generator underflow is interrupted, sampling inductive current il1 (k)；
B. sample clock generator cycle interruption, sampling inductive current il2 (k), sampling and outputting voltage Uo (k)；
C. discretization active power calculating is carried out；
D. discretization reactive power calculating is carried out.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201711356842.0A CN108459202A (en) | 2017-12-16 | 2017-12-16 | A kind of high-precision detecting method of active power and reactive power |
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| CN201711356842.0A CN108459202A (en) | 2017-12-16 | 2017-12-16 | A kind of high-precision detecting method of active power and reactive power |
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| CN108459202A true CN108459202A (en) | 2018-08-28 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111030169A (en) * | 2019-12-06 | 2020-04-17 | 深圳市优优绿能电气有限公司 | Calculation method of power grid parameters under phase-locked condition and readable storage medium |
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