CN104502674A - Three-phase voltage effective value detection method and device - Google Patents
Three-phase voltage effective value detection method and device Download PDFInfo
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- CN104502674A CN104502674A CN201410844474.4A CN201410844474A CN104502674A CN 104502674 A CN104502674 A CN 104502674A CN 201410844474 A CN201410844474 A CN 201410844474A CN 104502674 A CN104502674 A CN 104502674A
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Abstract
The invention relates to a three-phase voltage effective value detection method and device. The method includes: sampling three-phase voltages Ua, Ub and Uc in real time; subjecting the three-phase voltages Ua, Ub and Uc to ABC/dq rotating coordinate system transformation and phase locking to acquire grid voltage phase theta; when the phase theta is less than a phase threshold thetath, structuring three-phase reference sines Sintheta, Sin(theta-2pi/3) and Sin(theta+2pi/3) synchronous with the three-phase electric phases according to the three-phase voltage phase theta; dividing the three-phase voltages Ua, Ub and Uc by the corresponding three-phase reference sines Sintheta, Sin(theta-2pi/3) and Sin(theta+2pi/3) to obtain three-phase voltage peak values Uam, Ubm and Ucm, namely Uam=Ua/Sintheta, Ubm=Ub/Sin(theta-2pi/3) and Ucm=Uc/Sin(theta+2pi/3); according to that the three-phase voltage peak values are equal to square root of 2 times of effective values correspondingly, respectively calculating three-phase voltage effective values Uarms=Uam/square root of 2, Ubrms=Ubm/square root of 2 and Ucrms=Ucm/square root of 2, namely Uarms=Ua/square root of 2*Sintheta, Ubrms=Ub/ square root of 2*Sin(theta-2pi/3) and Ucrms=Uc/square root of 2* Sin(theta+2pi/3). By the method, the problems of high real-time difficulty and large occupation on system memory due to the traditional effective value calculation method in the power electronic digital control system are solved.
Description
Technical field
The present invention relates to a kind of three-phase voltage RMS to DC method and pick-up unit.
Background technology
In power electronics Digitizing And Control Unit, to be sampled by three-phase voltage and three-phase electricity is phase-locked utilizes the definition of effective value to calculate effective value afterwards, as follows:
In above formula,
--three-phase voltage effective value,
--three-phase voltage instantaneous value.
Wherein, N is that discrete sampling in one-period is counted.Adopt this kind of method, need to do N multiplication, N sub-addition, a division and once open radical sign to calculate.If control to calculate this N number of sampled point in beat at one simultaneously, larger CPU running space and Installed System Memory can be taken, cannot meet the very high control system of current requirement of real-time.Therefore, the method that other calculates fast need be sought.
Mention in some document and utilize mean value to carry out the sinusoidal wave effective value of Equivalent Calculation, both relations are as follows:
--three-phase voltage peak value,
--mean value in three-phase voltage one-period.
It only needs to do N sub-addition and a multiplication, substantially reduces required CPU running space.But in the control system that requirement of real-time is very high, sometimes this also cannot meet the demands, need the thought adopting parallel computation, store the sampled value of one-period with queue and calculate mean value in advance, then according to the principle of " first-in first-out ", mean value is upgraded, thus reach the object calculated fast.Utilize mean value to be that voltage waveform is standard sine wave, harmonic content is little to calculate the method prerequisite of effective value, when wave form distortion, can there is larger error in the effective value that the method is calculated.Said method can take larger Installed System Memory equally.
Summary of the invention
For above technical background mention the shortcoming of existing scheme, the invention provides a kind of three-phase voltage RMS to DC method and pick-up unit, solve the problem of the large and larger internal memory of the system that takies of real-time difficulty that effective value computing method traditional in power electronics Digitizing And Control Unit bring.
For achieving the above object, the present invention adopts following technical scheme: a kind of three-phase voltage RMS to DC method, is characterized in that comprising the following steps:
S1: sampling three-phase electricity phase voltage Ua, Ub and Uc;
S2: described three-phase electricity phase voltage Ua, Ub and Uc convert phase-locked acquisition three-phase voltage phase theta by ABC/dq rotating coordinate system;
S3: when described electric network voltage phase θ satisfies condition: during θ < θ th, wherein θ th is phase threshold, constructs the three-phase reference sinusoidal synchronous with three-phase potential according to three-phase voltage phase theta
,
,
, otherwise get back to S1;
S4: described three-phase electricity phase voltage Ua, Ub and Uc are divided by the three-phase reference sinusoidal of correspondence
,
,
, obtain peak value Uam, Ubm, Ucm of described three-phase electricity phase voltage, namely
;
S5: equal effective value according to three-phase voltage peak value
doubly, the effective value of described three-phase electricity phase voltage is calculated respectively
,
,
, namely
.
In an embodiment of the present invention, the span of described phase threshold θ th is
.
In an embodiment of the present invention, average after the effective value also comprising effective value Uarms (k) and the A phase voltage in a front m-1 cycle calculating current period A phase voltage further adds up, average after effective value Ubrms (k) of current period B phase voltage and the effective value of the B phase voltage in a front m-1 cycle add up, average after effective value Ucrms (k) of current period C phase voltage and the effective value of the C phase voltage in a front m-1 cycle add up, namely the effective value of three-phase voltage is respectively
,
,
, wherein m is positive integer.
A kind of three-phase voltage RMS to DC device, comprise an ABC/dq rotating coordinate system conversion phase lock circuitry, one reference sinusoidal generative circuit, first divider and the second divider, it is characterized in that: described ABC/dq rotating coordinate system conversion phase lock circuitry first, second, 3rd input end and described first divider second, 3rd, four-input terminal connects one to one, described ABC/dq rotating coordinate system conversion phase lock circuitry output terminal is connected with described reference sinusoidal generative circuit input end, described reference sinusoidal generative circuit output terminal is connected with described first divider first input end, described first divider first, second, 3rd output terminal and described second divider first, second, 3rd input end connects one to one.
In an embodiment of the present invention, be also provided with a wave filter, described second divider first, second, third output terminal and described wave filter first, second, third input end connect one to one.
In an embodiment of the present invention, described first divider first, second, third output end signal be respectively the first divider first input end signal divided by the first divider second, third, four-input terminal signal.
In an embodiment of the present invention, described second divider first, second, third output end signal be respectively the second divider first, second, third input end signal divided by
.
The present invention compared with prior art has following beneficial effect:
1, the problem that large needs of real-time operation difficulty that traditional three-phase voltage RMS to DC computing method bring take larger CPU running space is overcome;
2, each cycle has the sampled point of more than half the time to calculate effective value, real-time;
3, without the need to expanding the effective value of memory headroom for calculating after store sample, the memory headroom of use is reduced.
Accompanying drawing explanation
Fig. 1 is three-phase voltage RMS to DC method flow diagram of the present invention.
Fig. 2 is three-phase voltage RMS to DC device circuit theory diagram of the present invention.
1-ABC/dq rotating coordinate system conversion phase lock circuitry, 2-reference sinusoidal generative circuit in figure
3-the first divider 4-the second divider 5-wave filter.
Embodiment
Below in conjunction with drawings and Examples, the present invention will be further described.
Please refer to Fig. 1, the invention provides a kind of three-phase voltage RMS to DC method, it is characterized in that comprising the following steps:
S1: sampling three-phase electricity phase voltage Ua, Ub and Uc;
S2: described three-phase electricity phase voltage Ua, Ub and Uc convert phase-locked acquisition three-phase voltage phase theta by ABC/dq rotating coordinate system;
S3: when described electric network voltage phase θ satisfies condition: during θ < θ th, wherein θ th is phase threshold, constructs the three-phase reference sinusoidal synchronous with three-phase potential according to three-phase voltage phase theta
,
,
, otherwise get back to S1;
S4: described three-phase electricity phase voltage Ua, Ub and Uc are divided by the three-phase reference sinusoidal of correspondence
,
,
, obtain peak value Uam, Ubm, Ucm of described three-phase electricity phase voltage, namely
;
S5: equal effective value according to three-phase voltage peak value
doubly, the effective value of described three-phase electricity phase voltage is calculated respectively
,
,
, namely
.
In the present embodiment, the span of described phase threshold θ th is
.
In the present embodiment, average after the effective value also comprising effective value Uarms (k) and the A phase voltage in a front m-1 cycle calculating current period A phase voltage further adds up, average after effective value Ubrms (k) of current period B phase voltage and the effective value of the B phase voltage in a front m-1 cycle add up, average after effective value Ucrms (k) of current period C phase voltage and the effective value of the C phase voltage in a front m-1 cycle add up, namely the effective value of three-phase voltage is respectively
,
,
, wherein m is positive integer.
Please refer to Fig. 2, the present invention also provides a kind of three-phase voltage RMS to DC device, comprise an ABC/dq rotating coordinate system conversion phase lock circuitry 1, one reference sinusoidal generative circuit 2, first divider 3 and the second divider 4, it is characterized in that: described ABC/dq rotating coordinate system conversion phase lock circuitry 1 first, second, 3rd input end and described first divider 3 second, 3rd, four-input terminal connects one to one, described ABC/dq rotating coordinate system conversion phase lock circuitry 1 output terminal is connected with described reference sinusoidal generative circuit 2 input end, described reference sinusoidal generative circuit 2 output terminal is connected with described first divider 3 first input end, described first divider 3 first, second, 3rd output terminal and described second divider 4 first, second, 3rd input end connects one to one.
Continue referring to Fig. 2, be also provided with a wave filter 5, described second divider 4 first, second, third output terminal and described wave filter 5 first, second, third input end connect one to one.
In the present embodiment, described first divider 3 first, second, third output end signal be respectively the first divider 3 first input end signal divided by the first divider 3 second, third, four-input terminal signal.
In the present embodiment, described second divider 4 first, second, third output end signal be respectively the second divider 4 first, second, third input end signal divided by
.
The foregoing is only preferred embodiment of the present invention, all equalizations done according to the present patent application the scope of the claims change and modify, and all should belong to covering scope of the present invention.
Claims (7)
1. a three-phase voltage RMS to DC method, is characterized in that comprising the following steps:
S1: sampling three-phase electricity phase voltage Ua, Ub and Uc;
S2: described three-phase electricity phase voltage Ua, Ub and Uc convert phase-locked acquisition three-phase voltage phase theta by ABC/dq rotating coordinate system;
S3: when described electric network voltage phase θ satisfies condition: during θ < θ th, wherein θ th is phase threshold, constructs the three-phase reference sinusoidal synchronous with three-phase potential according to three-phase voltage phase theta
,
,
, otherwise get back to S1;
S4: described three-phase electricity phase voltage Ua, Ub and Uc are divided by the three-phase reference sinusoidal of correspondence
,
,
, obtain peak value Uam, Ubm, Ucm of described three-phase electricity phase voltage, namely
;
S5: equal effective value according to three-phase voltage peak value
doubly, the effective value of described three-phase electricity phase voltage is calculated respectively
,
,
, namely
.
2. three-phase voltage RMS to DC method according to claim 1, is characterized in that: the span of described phase threshold θ th is
.
3. three-phase voltage RMS to DC method according to claim 1, it is characterized in that: average after the effective value also comprising effective value Uarms (k) and the A phase voltage in a front m-1 cycle calculating current period A phase voltage further adds up, average after effective value Ubrms (k) of current period B phase voltage and the effective value of the B phase voltage in a front m-1 cycle add up, average after effective value Ucrms (k) of current period C phase voltage and the effective value of the C phase voltage in a front m-1 cycle add up, namely the effective value of three-phase voltage is respectively
,
,
, wherein m is positive integer.
4. a three-phase voltage RMS to DC device, comprise an ABC/dq rotating coordinate system conversion phase lock circuitry, one reference sinusoidal generative circuit, first divider and the second divider, it is characterized in that: described ABC/dq rotating coordinate system conversion phase lock circuitry first, second, 3rd input end and described first divider second, 3rd, four-input terminal connects one to one, described ABC/dq rotating coordinate system conversion phase lock circuitry output terminal is connected with described reference sinusoidal generative circuit input end, described reference sinusoidal generative circuit output terminal is connected with described first divider first input end, described first divider first, second, 3rd output terminal and described second divider first, second, 3rd input end connects one to one.
5. three-phase voltage RMS to DC device according to claim 4, is characterized in that: be also provided with a wave filter, and described second divider first, second, third output terminal and described wave filter first, second, third input end connect one to one.
6. three-phase voltage effective value monitoring device according to claim 4, is characterized in that: described first divider first, second, third output end signal be respectively the first divider first input end signal divided by the first divider second, third, four-input terminal signal.
7. three-phase voltage effective value monitoring device according to claim 4, is characterized in that: described second divider first, second, third output end signal be respectively the second divider first, second, third input end signal divided by
.
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| CN108020720A (en) * | 2017-11-08 | 2018-05-11 | 中国航空工业集团公司金城南京机电液压工程研究中心 | Sinusoidal signal real-time resolving method based on FPGA |
| CN111293982A (en) * | 2019-12-30 | 2020-06-16 | 扬州船用电子仪器研究所(中国船舶重工集团公司第七二三研究所) | Three-phase sine wave generation method and system with phase locking and amplitude modulation functions |
| CN112583402A (en) * | 2021-02-24 | 2021-03-30 | 沈阳微控新能源技术有限公司 | Phase locking method, phase-locked loop, three-phase grid-connected system and computer storage medium |
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Effective date of registration: 20231201 Address after: Room 208-38, Hengye Building, No. 100 Xiangxing Road, Xiang'an Industrial Zone, Xiamen Torch High tech Zone, Xiamen, Fujian Province, 361000 Patentee after: Xiamen Kehua shuneng Technology Co.,Ltd. Address before: 363000 Zhangzhou Kehua Technology Co., Ltd., Beidou Industrial Park, Jinfeng Industrial Zone, Zhangzhou City, Fujian Province Patentee before: ZHANGZHOU KEHUA TECHNOLOGY Co.,Ltd. |