WO2013155844A1 - 一种三相交流电相序检测方法及装置 - Google Patents
一种三相交流电相序检测方法及装置 Download PDFInfo
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- WO2013155844A1 WO2013155844A1 PCT/CN2012/085962 CN2012085962W WO2013155844A1 WO 2013155844 A1 WO2013155844 A1 WO 2013155844A1 CN 2012085962 W CN2012085962 W CN 2012085962W WO 2013155844 A1 WO2013155844 A1 WO 2013155844A1
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- phase
- alternating current
- phase alternating
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R25/00—Arrangements for measuring phase angle between a voltage and a current or between voltages or currents
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R29/00—Arrangements for measuring or indicating electric quantities not covered by groups G01R19/00 - G01R27/00
- G01R29/18—Indicating phase sequence; Indicating synchronism
Definitions
- the invention relates to the technical field of three-phase alternating current, in particular to a three-phase alternating current phase sequence detecting method, and a three-phase alternating current phase sequence detecting device using the detecting method.
- the three-phase alternating current phase sequence has a crucial impact on the normal operation of three-phase electrical equipment. Under normal circumstances, the three-phase AC power supply requirements of three-phase electrical equipment are positive (as shown in Figure 1), and negative sequence is not allowed (as shown in Figure 2). Taking the electric drive equipment as an example, if the phase sequence of the three-phase AC power supply is wrong, the power transmission equipment will be reversely operated, causing malfunction of the electric drive equipment and even causing personal injury to the operator. Therefore, it is necessary to introduce a three-phase alternating current phase sequence detection and discrimination function in the control of the electric power transmission equipment.
- the phase frequency information of the three-phase alternating current is extracted by extracting the angular frequency information of the three-phase alternating current, and the phase sequence of the three-phase alternating current is determined by judging the angular frequency information.
- the control system is complicated because the angular frequency information of the three-phase alternating current needs to be extracted, and the feedback loop and the error signal are adjusted during the angular frequency extraction process.
- the three-phase alternating current phase sequence detection method includes the following steps:
- the periodic function being a linear function in a minimum positive period, and the periodic function
- the period is the same as the period of the three-phase alternating current signal, and the positive and negative phases of the three-phase alternating current phase are judged according to the increase or decrease of the periodic function in a minimum positive period: if the periodic function is increased in a minimum positive period The function determines that the three-phase alternating current phase sequence is a positive sequence; if the periodic function is a subtractive function in a minimum positive period, determining that the three-phase alternating current phase sequence is a negative sequence.
- the three-phase alternating current signal is a three-phase alternating current voltage signal or a three-phase alternating current current signal.
- step 2) the manner of coordinate transformation is performed by Clarke coordinate transformation;
- the formula of Clarke coordinate transformation is:
- D a , D b and D e are instantaneous values of three-phase alternating current signals, and D a and Dp are instantaneous values
- DD b and D e perform the Clarke coordinate transformation to obtain the electrical signal component in the two-phase stationary coordinate system.
- the inverse tangent calculation of the electrical signal component is: iarctan(Z) / g /D a ) 0 ⁇ arctan(Z) / g / ⁇ ⁇ ) ⁇ ⁇
- the sampling period is greater than the sampling error and less than the period of the three-phase alternating current signal.
- the method for determining whether the periodic function is an increasing function or a decreasing function in a minimum positive period is:
- sampling period is less than or equal to 0.1 times the period of the three-phase alternating current signal.
- the step 1) further comprises: performing a standardization process on the set of instantaneous values, and the formula of the standardization process is:
- X is ab
- c, D a , D b and D c are the instantaneous values of the three-phase alternating current signal
- ( ⁇ is the maximum value of the three-phase alternating current signal
- d a , d b and d e are three phases The value of the instantaneous value of the AC signal.
- the step 3) further comprises: performing standardization processing on the output signal value, and the formula of the standardization processing is:
- the invention also provides a three-phase alternating current phase sequence detecting device, which comprises a three-phase alternating current power sampling module, a coordinate system transformation module, an inverse tangent function calculation module and a phase sequence direction determining module;
- the three-phase alternating current power sampling module is configured to perform real-time sampling on the instantaneous value of the three-phase alternating current signal
- the coordinate system conversion module is configured to convert instantaneous values of at least two groups of three-phase alternating current signals in a three-phase stationary coordinate system obtained by real-time sampling of a three-phase alternating current sample module into electricity in a two-phase stationary coordinate system. Signal component, and transmit it in real time to the inverse tangent function calculation module;
- the arctangent function calculation module is configured to perform arctangent calculation on the electrical signal component respectively, and obtain at least two output signal values, and output the same to the phase sequence direction determining module in real time;
- the phase sequence direction determining module is configured to determine the positive and negative phases of the three-phase alternating current phase sequence according to the increase or decrease of the periodic function of the at least two output signal values in a minimum positive period.
- the detecting device further includes a first standardization processing module and/or a second standardization processing module.
- the first standardization processing module is configured to perform standardization processing on the instantaneous values of at least two sets of three-phase alternating current signals obtained by the three-phase alternating current electric current sample module, and output the standard value to the real-time output to the target value.
- Coordinate system transformation module
- the second standardization processing module is configured to obtain at least two of the arctangent function calculation modules
- the output signal values are subjected to standardization processing, and the standard values are output to the phase sequence direction determination module in real time.
- the three-phase alternating current signal required by the present invention is a phase voltage signal or a phase current signal, and does not need to be converted into a line voltage signal or a line current signal, and is simple and practical.
- the invention can be directly applied to the field of digital control, and can quickly and accurately detect the phase sequence of the three-phase alternating current signal without adding a new peripheral hardware loop, and the judging method is simple and reliable, and has a simple detection algorithm and no feedback loop. It does not require parameter adjustment and is suitable for the development of embedded systems.
- the anti-interference ability of the invention is strong, and the phase sequence of the three-phase alternating current signal can be detected quickly and accurately under the condition that the three-phase alternating current signal has serious harmonics or imbalance.
- FIG. 1 is a schematic diagram of a three-phase AC voltage positive sequence vector in the prior art
- FIG. 2 is a schematic diagram of a three-phase AC voltage negative sequence vector in the prior art
- FIG. 3 is a schematic flow chart showing a three-phase alternating current phase sequence detecting method according to a first embodiment of the present invention
- 4-1 to 4-3 are waveform diagrams of respective parameters when the three-phase alternating current phase sequence is positive in accordance with the first embodiment of the present invention
- Figure 4-1 shows the instantaneous values of the two phases in the three-phase AC phase voltage.
- Ua and Ub are the waveforms of the values ua and ub (the waveform of Uc is not shown).
- Figure 4-2 is a waveform diagram of phase voltage components ua and ⁇ in a two-phase stationary coordinate system obtained by performing clarke coordinate transformation on the values ua, ub, and uc;
- Figure 4-3 is a waveform diagram of the value of the output signal value y* obtained by calculating the inverse tangent function of the voltage components ua and ⁇ in the two-phase stationary coordinate system and performing the labeling process;
- 5-1 to 5-3 are waveform diagrams of respective parameters when the three-phase alternating current phase sequence is in negative sequence according to the first embodiment of the present invention.
- Figure 5-1 shows the instantaneous values of the two phases in the three-phase AC phase voltage.
- Ua and Ub are the waveforms of the values ua and ub (the waveform of Uc is not shown).
- Figure 5-2 is a waveform diagram of the phase voltage components ua and ⁇ in the two-phase stationary coordinate system obtained by performing the Clarke coordinate transformation on the nominal values ua, ub, and uc;
- FIG. 5-3 is a waveform diagram of the value y* of the output signal value obtained by performing the inverse tangent function calculation of the voltage components ua and ⁇ in the two-phase stationary coordinate system and performing the labeling process;
- Fig. 6 is a view showing the structural composition of a three-phase alternating current phase sequence detecting apparatus according to a first embodiment of the present invention. detailed description
- a three-phase alternating current phase sequence detection method includes the following steps:
- the periodic function being a linear function in a minimum positive period, and the periodic function
- the period is the same as the period of the three-phase alternating current signal, and the positive and negative phases of the three-phase alternating current phase are judged according to the increase or decrease of the periodic function in a minimum positive period: if the periodic function is increased in a minimum positive period The function determines that the three-phase alternating current phase sequence is a positive sequence; if the periodic function is a subtractive function in a minimum positive period, determining that the three-phase alternating current phase sequence is a negative sequence.
- a three-phase alternating current phase sequence detecting device comprises a three-phase alternating current sampling module, a coordinate system conversion module, an inverse tangent function calculation module and a phase sequence direction determining module;
- the three-phase alternating current power sampling module is configured to perform real-time sampling on the instantaneous value of the three-phase alternating current signal
- the coordinate system conversion module is configured to convert instantaneous values of at least two sets of three-phase alternating current signals in a three-phase static coordinate system obtained by real-time sampling of a three-phase alternating current sample module into electric signals in a two-phase stationary coordinate system, respectively. Component, and transmit it in real time to the inverse tangent function calculation module;
- the arctangent function calculation module is configured to perform an arctangent calculation on the electrical signal component, respectively. Obtaining at least two output signal values and outputting them to the phase sequence direction judging module in real time; the phase sequence direction judging module is configured to calculate a periodic function of the at least two output signal values at a minimum positive The increase or decrease in the period is used to judge the positive and negative phase sequence of the three-phase alternating current.
- the three-phase alternating current signal (the instantaneous values of D a , D b and D e ) is a three-phase alternating current phase voltage signal (the instantaneous values are U a , U b and U c ).
- the three-phase alternating current phase sequence detection method includes the following steps:
- the sampling period is greater than the sampling error and less than the period of the three-phase alternating current voltage.
- the set of instantaneous values U a , U b and U c obtained by the real-time sampling are subjected to standardization processing to obtain the standard values u a , u b and u c of the instantaneous values of the set.
- the process of standardizing a certain / a group of parameters is the process of calculating its value. Applying the standardization process can save the scale factor in the formula, simplify the calculation, and make it easy to calculate and compare the results. In the present embodiment, it is preferable to use the standardization processing, but if the standardization processing is not used, the phase sequence judgment result of the three-phase alternating current signal is not affected.
- the formula for standardizing the instantaneous values u a , u b and u c of the three-phase alternating current phase voltage is:
- X is a, b, c, U a , U b and U c are the instantaneous values of the three-phase AC phase voltage
- u max is the maximum value of the three-phase AC phase voltage
- u a , u b and u c are three The value of the instantaneous value of the phase-to-phase voltage.
- the coordinate transformation method uses a Clarke coordinate transformation
- the Clarke coordinate transformation can convert a three-phase stationary coordinate system into a two-phase stationary coordinate system.
- the formula for the Clarke coordinate transformation is:
- u a , u b and u c are the standard values of the instantaneous values of the three-phase AC phase voltage
- u a and up are the two phases obtained by performing the Clarke coordinate transformation on the standard values u a , u b and u c
- the phase voltage in the stationary coordinate system is divided into sl04.
- the phase voltage components u a and up in the two-phase stationary coordinate system are subjected to arctangent calculation to obtain the sample time (ie, the set of phase voltage instantaneous values are obtained by the sample).
- An output signal value y corresponding to the time of U a , U b and U c ).
- y is the output signal value
- u a and up are the phase voltage components in the two-phase stationary coordinate system, and 0 ⁇ y ⁇ 2; r can be seen.
- the output signal value y corresponding to the sample time is subjected to a standardization process to obtain a value y* of the output signal value y.
- y is the output signal value and y* is the target value of the output signal value. Visible 0 ⁇ y* ⁇ l. Sl06.
- the steps sl01 ⁇ s105 are performed one or more times to obtain the value y* of the output signal value corresponding to one or more sample times adjacent to the sample time described in step sl05.
- the standard value y* of at least two output signal values constitutes a periodic function (the ordinate is the standard value y* of the output signal value, and the abscissa is the sampling period)
- the periodic function is a linear function in a minimum positive period, and the period of the periodic function is the same as the period of the three-phase alternating current voltage, according to the increase or decrease of the periodic function in a minimum positive period.
- the periodic function is an increasing function or a decreasing function in a minimum positive period, and only needs to obtain an output signal value corresponding to the instantaneous values of two sets of three-phase alternating current voltages acquired at two adjacent sampling times. can. That is to say, only the standard value y* of an output signal value corresponding to the sampling time obtained in step sl05 is needed, and one corresponding to the sampling time adjacent to the sampling time mentioned in step sl05 obtained in step sl06. The value of the output signal value is y*.
- the method for determining whether the periodic function is an increasing function or a decreasing function in a minimum positive period is specifically as follows:
- Figure 4-1 to Figure 4-3 and Figure 5-1 to Figure 5-3 are waveform diagrams of the parameters u a , u b , u a , up and y* for the three-phase alternating current phase sequence in positive and negative sequence, respectively. Since the three-phase AC phase voltage has a vector and a zero relationship, the waveform of the third phase voltage can be known from the waveform of any two-phase voltage, so Figure 4-1 to Figure 4-3 and Figure 5-1 to Figure 5 The waveform of u c is not shown in -3.
- the waveform between the adjacent two peaks in the waveform of any one of the three phase alternating current voltages is a waveform within a minimum positive period, that is, The waveform between the adjacent two peaks corresponds to a minimum positive period, and a certain phase voltage (for example) must exist in the three-phase alternating phase voltage, and the phase voltage values of adjacent two peaks in the waveform in the minimum positive period Corresponding to the maximum or minimum value of the primary function in a minimum positive period of the periodic function, as shown in FIGS. 4-1 to 4-3 and FIGS. 5-1 to 5-3.
- y*(nl) is an output corresponding to the instantaneous value of the three-phase AC phase voltage obtained by the adjacent sampling time in the minimum positive period of the same three-phase AC phase voltage at the time of the certain sampling time.
- the standard value of the signal that is, y*(n) and y*(nl) are respectively obtained from two adjacent sampling times in a minimum positive period of a phase voltage (such as u a ) of the three-phase AC phase voltage.
- the value of the output signal corresponding to the instantaneous value of the three-phase AC phase voltage.
- the periodic function when 0 ⁇ Ay* ⁇ l, the periodic function is an increasing function in a minimum positive period; when -l ⁇ Ay* ⁇ 0, the periodic function is a decreasing function in a minimum positive period. .
- the sampling period At is less than or equal to 0.1 times the period T of the three-phase alternating current signal, that is, At 0.1T.
- the embodiment further provides a three-phase alternating current phase sequence detecting device, including a three-phase alternating current power sampling module, a coordinate system conversion module, an inverse tangent function calculation module, a first standardization processing module, and a second The standardization processing module and the phase sequence direction judgment module.
- a three-phase alternating current phase sequence detecting device including a three-phase alternating current power sampling module, a coordinate system conversion module, an inverse tangent function calculation module, a first standardization processing module, and a second The standardization processing module and the phase sequence direction judgment module.
- the three-phase alternating current sample module is used for real-time sampling of the instantaneous value of the three-phase alternating current signal, and the instantaneous value of at least two groups of three-phase alternating current signals in a three-phase stationary coordinate system obtained in real time.
- D a , D b and D c are transmitted to the first standardization processing module in real time.
- the first standardization processing module is configured to respectively process the instantaneous values D a , D b and D c of the at least two groups of three-phase alternating current signals, and obtain at least two groups of labels
- the values d a , d b and d c are respectively output to the coordinate system transformation module in real time.
- the coordinate system transformation module is configured to convert the standard values d a , d b and d c of the instantaneous values of the three-phase alternating current signals of the at least two groups in the three-phase stationary coordinate system into two-phase stationary coordinate systems, respectively.
- the lower electrical signal components d a , dp , and the resulting at least two sets of electrical signal components are transmitted in real time to the inverse tangent function calculation module.
- the value of the instantaneous value of each set of three-phase AC signals corresponds to a different set of electrical signal components.
- the arctangent function calculation module is configured to perform arctangent calculation on the at least two sets of electrical signal components d a , dp , respectively, to obtain at least two output signal values y, and to generate the at least two output signal values y in real time Output to the second standardization processing module.
- the second standardization processing module is configured to respectively perform the labeling processing on the at least two output signal values y, and output the obtained at least two standard values y* to the phase sequence direction determining module in real time.
- the phase sequence direction determining module is configured to: according to the standard value y* of the at least two output signal values
- the periodic function of the periodic function is judged to increase or decrease in a minimum positive period to determine the positive and negative phase sequence of the three-phase alternating current. If the periodic function is an increasing function in a minimum positive period, the phase sequence of the three-phase alternating current is positive. If the periodic function is a decreasing function in a minimum positive period, the three-phase alternating current phase sequence is a negative sequence.
- the three-phase alternating current signal is a three-phase alternating current phase voltage signal (the instantaneous values of U a , U b and U e ) or a three-phase alternating current phase current signal (the instantaneous values of which are Ia, lb and Ic);
- the three-phase alternating current sampling module can use existing modules, such as a Hall sensor, a resistor divider module, a current transformer, etc.; the coordinate system conversion module can use an existing Clarke coordinate transformation module.
- the three-phase alternating current signal is a three-phase alternating current signal (its instantaneous values are Ia, lb, and Ic), and the period of the three-phase alternating current phase is known to be the same as the period of the three-phase alternating current voltage;
- the detection method described in this embodiment does not include step s102 and/or step s105, that is, the detection method does not include standardizing the instantaneous values (Ia, lb, and Ic) of the three-phase AC phase current. Steps and/or steps of standardizing the output signal values corresponding to the sample time.
- the difference between the three-phase alternating current phase sequence detecting device of this embodiment and the first embodiment is that the detecting device does not include the first standardizing processing module and/or the second standardizing processing module.
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