CN111550913B - Phase locking device and air conditioner - Google Patents
Phase locking device and air conditioner Download PDFInfo
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- CN111550913B CN111550913B CN202010432996.9A CN202010432996A CN111550913B CN 111550913 B CN111550913 B CN 111550913B CN 202010432996 A CN202010432996 A CN 202010432996A CN 111550913 B CN111550913 B CN 111550913B
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/88—Electrical aspects, e.g. circuits
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/62—Control or safety arrangements characterised by the type of control or by internal processing, e.g. using fuzzy logic, adaptive control or estimation of values
- F24F11/63—Electronic processing
- F24F11/64—Electronic processing using pre-stored data
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03L—AUTOMATIC CONTROL, STARTING, SYNCHRONISATION OR STABILISATION OF GENERATORS OF ELECTRONIC OSCILLATIONS OR PULSES
- H03L7/00—Automatic control of frequency or phase; Synchronisation
- H03L7/06—Automatic control of frequency or phase; Synchronisation using a reference signal applied to a frequency- or phase-locked loop
- H03L7/08—Details of the phase-locked loop
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Abstract
The invention provides a phase locking device, which is used for single-phase locking of an air conditioner and comprises: the PPLL phase-locked loop is used for calculating a first frequency, a first amplitude and a phase of the electric signal according to the electric signal after the uncontrolled rectifier bridge; the zero-crossing-like detection device is used for detecting a second amplitude of the electric signal, performing zero-crossing matching detection on the electric signal after the uncontrolled rectifier bridge, and calculating to obtain a second frequency of the electric signal according to the time corresponding to the zero-crossing point of the electric signal; and the Kalman filter is used for receiving the first frequency, the first amplitude, the phase, the second frequency and the second amplitude and performing Kalman filtering calculation to obtain the final amplitude, the final phase and the final frequency of the electric signal. The phase locking device combines the advantages of two phase locking methods, utilizes the advantages of Kalman filtering, such as capability of greatly eliminating sampling errors and high recursive computation response speed, realizes the rapid and accurate phase locking function of single-phase electric system voltage or current signals, and far exceeds the dynamic performance and static performance of the traditional phase-locked loop.
Description
Technical Field
The invention relates to the technical field of air conditioners, in particular to a phase locking device and an air conditioner.
Background
Power Factor Correction (PFC) is commonly applied to variable frequency air conditioners to achieve Power Factor Correction. For cost, reliability and compatibility considerations, grid voltage sampling is often placed on the rear side of the uncontrolled rectifier bridge. With the continuous upgrade of national standard to the power grid quality requirement and the continuous iteration of technology, the current PFC needs to have a phase locking function. The current phase-locking technology at the back end of the single-phase uncontrolled rectifier bridge is realized based on hardware zero-crossing point detection phase-locking or power-based PLL (PPLL) software phase-locking, and the two phase-locking technologies have some inherent disadvantages.
The zero-crossing-like detection method has the following defects: because the frequency can be determined and measured only at the moment when the comparison values of the voltages at the rear sides of the uncontrolled rectifier bridges are matched, the calculation step length of the phase-locked system is the shortest half power frequency period, and the frequency change in the period cannot be detected. Under the condition of harmonic interference or white noise interference, the voltage or current of a power grid can be triggered and compared for multiple times in a single period, so that a large error occurs in the frequency measurement of a signal, and the phase locking fails. If the amplitude parameter of the input signal measured by using the maximum value detection method is interfered by harmonics, a large deviation can occur; if the method of integral averaging is used to measure the amplitude parameter of the input signal, the measurement error will be inevitably caused due to the influence of the precision of the digital integrator and the sampling frequency.
The power-based PLL software phase lock has the following disadvantages: in a single-phase electric system, a PLL software phase locking technology based on power is realized by virtualizing a unit virtual current orthogonal to an input voltage and multiplying the unit virtual current by the unit virtual current to obtain a power value, wherein the frequency of the power value is twice of the frequency of a network-side fundamental wave and is not less than zero constantly, so that the phase locking can be realized at the rear end of an uncontrolled rectifier bridge. However, the dynamic response characteristic of the PLL is poor, and complete phase locking can be successfully achieved after multiple power frequency cycles are needed, so that the amplitude, the phase and the frequency of the power grid cannot be quickly tracked.
Disclosure of Invention
The present invention is directed to a phase locking device and an air conditioner, which at least partially solve the above technical problems.
To solve the above problems, an aspect of the present invention provides a phase-locking device for a single-phase lock of an air conditioner, including: the PPLL phase-locked loop is used for calculating a first frequency, a first amplitude and a phase of the electric signal according to the electric signal after the uncontrolled rectifier bridge; the zero-crossing-like detection device is used for detecting a second amplitude of the electric signal, performing zero-crossing matching detection on the electric signal after the uncontrolled rectifier bridge, and calculating to obtain a second frequency of the electric signal according to a moment corresponding to the zero-crossing point of the electric signal; and the Kalman filter is used for receiving the first frequency, the first amplitude, the phase, the second frequency and the second amplitude and performing Kalman filtering calculation to obtain a final amplitude, a final phase and a final frequency.
Therefore, the PPLL phase locking method and the zero crossing point-like detection phase locking method are cascaded through the extended Kalman filtering, the advantages of the two phase locking methods are combined, the advantages of the Kalman filtering that sampling errors can be greatly eliminated and the recursive computation response speed is high are utilized, the phase locking function of the single-phase electric system that voltage or current signals are fast and accurate is realized, and the dynamic performance and the static performance of the traditional phase-locked loop are far surpassed.
Optionally, the zero-crossing-like detection device includes: the zero crossing point-like frequency detection module is used for carrying out zero crossing point matching detection on the electric signal after the uncontrolled rectifier bridge and calculating to obtain a second frequency of the electric signal according to the time corresponding to the zero crossing point; and the maximum value method amplitude detection module is used for detecting the maximum value of the electric signal in one period and obtaining the second amplitude value according to the maximum value.
Optionally, the zero-crossing-like frequency detecting module includes: the detection device is used for detecting the voltage value or the current value of the electric signal output by the uncontrolled rectifier bridge; the comparator is used for judging whether the voltage value or the current value passes through a preset voltage value or a preset current value or not and outputting an electrical frequency signal when the voltage value or the current value passes through the preset voltage value or the preset current value; and the micro control unit is used for triggering interruption when the comparator outputs an electrical signal, recording the current trigger time, and calculating the frequency of the electrical signal output by the uncontrolled rectifier bridge at present according to the current trigger time.
Therefore, through reasonably designing the zero-crossing point frequency detection module, the zero-crossing detection of the electric signal output by the uncontrolled rectifier bridge can be quickly realized.
Optionally, the phase locking device further includes: and the analog-to-digital conversion module is used for converting the electric signal after the uncontrolled rectifier bridge into a discrete signal and inputting the discrete signal into the PPLL phase-locked loop and the maximum amplitude detection module.
Therefore, the electric signal is converted into the discrete signal through the analog-to-digital conversion module, calculation of the PPLL phase-locked loop and the maximum value method amplitude detection module is facilitated, and calculation efficiency is improved.
Optionally, when the voltage value or the current value passes through the preset voltage value or the preset current value for the first time, the comparator outputs a high electrical frequency, and the micro control unit detects a rising edge of the high electrical frequency and triggers an interrupt; when the voltage value or the current value passes through the preset voltage value or the preset current value again, the comparator outputs low electric frequency, and the micro control unit detects the falling edge of the low electric frequency and triggers interruption.
Therefore, in the zero crossing point detection process, only one comparator is used, and the micro control unit can be combined with the rising edge and the falling edge of the output voltage of the comparator to realize triggering interruption.
Optionally, the comparator comprises a device or circuit that can output different electrical frequency signals according to different input voltages or currents.
Therefore, the hardware comparator is used for comparing the voltage or the current, the time delay can be reduced to the minimum degree, and the precision is higher compared with the precision of software implementation. Therefore, the air conditioner phase lock is more accurate.
Optionally, the PPLL phase-locked loop calculates the electrical signal by a closed loop to obtain the first frequency, the first amplitude, and the phase.
Optionally, the kalman filter takes the phase, the first amplitude, and the first frequency as output predicted values of the single-phase electric phase-locked loop system, and takes the second amplitude and the second frequency as detection output values of the single-phase electric phase-locked loop system;
and respectively multiplying the output predicted value and the detection output value by a Kalman gain of a Kalman filter, and adding the multiplied values to obtain an output value of the Kalman filter, so as to obtain the final amplitude, the final phase and the final frequency according to the output value.
Optionally, the kalman filter adjusts the kalman gain in an iterative manner until the covariance between the output value of the kalman filter and the true value of the single-phase electric phase-locked loop system is minimum.
Therefore, by adjusting the Kalman gain, the minimum variance can be realized, and the accuracy of phase locking is further improved.
The invention also provides an air conditioner, which comprises the phase locking device, and the air conditioner can realize single-phase locking by using the phase locking device. The air conditioner has the advantages of the phase locking device, and the description is omitted.
Drawings
Fig. 1 is a block diagram schematically showing a phase locking apparatus provided in a first embodiment of the present invention;
fig. 2 is a schematic diagram showing a configuration of a zero-crossing-point-like detection apparatus according to a first embodiment of the present invention;
fig. 3 schematically shows a block diagram of a PPLL phase locked loop provided by a first embodiment of the present invention;
fig. 4 schematically shows a phase locking flow chart of the phase locking apparatus according to the first embodiment of the present invention.
Detailed Description
In order to make the purpose, features and advantages of the present invention more obvious and understandable, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The invention provides a phase locking device and an air conditioner, wherein the phase locking device is formed by cascading two phase locking methods through extended Kalman filtering, and the phase locking function of a single-phase electric system with high speed and accuracy of voltage or current signals is realized by utilizing the advantages of the Kalman filtering that sampling errors can be greatly eliminated and the response speed of recursive computation is high. The following description will be made by way of specific embodiments, and for convenience of description, the present invention will be described in detail by taking the voltage lock as an example, without limiting the present invention. The current phase locking mode can be referred to as a voltage phase locking mode, and details are not described again.
Example one
Fig. 1 schematically shows a structure diagram of a phase-locking device according to a first embodiment of the present invention, fig. 2 schematically shows a structure diagram of a zero-crossing-like detection device according to a first embodiment of the present invention, and fig. 3 schematically shows a structure diagram of a PPLL phase-locked loop according to a first embodiment of the present invention, as shown in fig. 1 to fig. 3, the phase-locking device may include: the PPLL phase-locked loop, the similar zero crossing point detection device and the Kalman filter, wherein the input of the PPLL phase-locked loop and the similar zero crossing point detection device is connected with the rear end of the uncontrolled rectifier bridge, and the input of the uncontrolled rectifier bridge is connected with the input of the Kalman filter.
And the PPLL phase-locked loop is used for calculating the first frequency, the first amplitude and the phase of the voltage signal according to the voltage signal after the uncontrolled rectifier bridge. Specifically, as shown in fig. 2, the PPLL pll receives the voltage signal V input after the uncontrolled rectifier bridgeacAs an input signal, the input signal is subjected to closed-loop calculation by the lock-ring structure shown in fig. 2, and then a first frequency, a first amplitude, and a phase of the input signal are obtained.
And the zero crossing point-like detection device is used for detecting a second amplitude of the voltage signal, performing zero crossing point matching detection on the voltage signal after the uncontrolled rectifier bridge, and calculating to obtain a second frequency of the voltage signal according to the time corresponding to the zero crossing point of the voltage signal. Specifically, as shown in fig. 3, the zero-crossing-point-like detection device is composed of two parts: a zero-crossing-like frequency detection module and a maximum amplitude detection module.
And the zero crossing point-like frequency detection module is used for receiving the voltage signal after the uncontrolled rectifier bridge as an input signal, performing zero crossing point matching detection on the input signal, and calculating to obtain a second frequency of the voltage signal according to a moment corresponding to the zero crossing point. The zero crossing point-like frequency detection module comprises a voltage detection device, a comparator and a Micro Control Unit (MCU), wherein the voltage detection device, the comparator and the micro control Unit are sequentially connected.
In a feasible manner of this embodiment, the voltage at the rear end of the uncontrolled rectifier bridge may be sampled by connecting two resistors in parallel at the rear end of the uncontrolled rectifier bridge, so as to implement real-time detection of the voltage. The voltage matching process is to determine whether a preset voltage value passes through the voltage variation process, and if the voltage output by the control rectifier bridge at a certain time just passes through (i.e., is equal to) the preset voltage value, it indicates that the voltage matching is successful.
In a feasible manner of this embodiment, the voltage matching process is implemented by a comparator, as shown in fig. 3, the comparator has two input terminals, one of the two input terminals inputs the voltage value V output by the uncontrolled rectifier bridge detected by the voltage detecting deviceacThe other end inputs a preset voltage value VrefAnd the comparator compares the voltage value with a preset voltage value to judge whether the voltage value is a voltage matching point or not, and outputs different electrical frequency signals according to the comparison result. When the voltage value passes through the preset voltage value for the first time, the comparator overturns to output high power frequency, and the micro control unit detects the rising edge of the high power frequency and triggers interruption; when the voltage value passes through the preset voltage value again, the comparator outputs low electric frequency in a turnover mode, and the micro control unit detects the falling edge of the low electric frequency and triggers interruption. Or when the voltage value passes through the preset voltage value for the first time, the comparator overturns to output low power frequency, and the micro control unit detects the falling edge of the high power frequency and triggers interruption; when the voltage value passes through the preset voltage value again, the comparator outputs high-frequency and low-frequency power in a turnover mode, and the micro control unit detects the rising edge of the low-frequency power and triggers interruption. At the voltage matching point, the comparator will flip output either at a high or low frequency, since the purpose of the comparator is to output a voltage flip when the voltages match, and the flip direction is not important and can be either high or low. The comparator in the present invention may be any device or hardware circuit capable of outputting different electrical frequency signals according to different input voltages, including but not limited to an operational amplifier, a digital optical coupler, etc., and the specific type of the present invention is not limited. In the embodiment, a hardware comparator is selected for voltage comparison, so that time delay can be reduced to the minimum degree, and the precision is higher compared with software implementation.
The micro control unit may include, for example: the interruption system can detect whether the output signal of the comparator is overturned or not and the overturning direction, and is used for triggering interruption when the comparator outputs an electrical frequency signal; the system clock is used for recording the current trigger time when the trigger is interrupted; and the frequency calculation unit is used for calculating the frequency of the voltage output by the current uncontrolled rectifier bridge according to the current trigger moment.
And the maximum value method amplitude detection module is used for receiving the single-phase uncontrolled rectified voltage signal as input, and taking the maximum value as the second amplitude of the electric signal by detecting the maximum value of the electric signal in a period (or other similar methods).
In order to facilitate calculation of the PPLL phase-locked loop and the maximum amplitude detection module and improve calculation efficiency, the phase-locked device can further comprise an analog-to-digital conversion module, the analog-to-digital conversion module collects voltage signals output after the uncontrolled rectifier bridge, converts the voltage signals into discrete signals, and inputs the discrete signals into the PPLL phase-locked loop and the maximum amplitude detection module as input signals to be calculated so as to obtain a first frequency, a first amplitude, a phase and a second amplitude. In this embodiment, the sampling system is provided in the micro control unit, and the sampling system has both signal sampling and analog-to-digital conversion functions, and the phase-locked calculating unit may include a maximum amplitude detecting module. That is, the maximum method amplitude detection module in the zero crossing point-like detection device may be set together with the frequency calculation unit to form a phase-locked calculation module (as shown in fig. 3), or may be set separately as the frequency calculation unit and the maximum method amplitude detection module (not shown in fig. 3), and the splitting and combining of the specific function modules are set according to actual requirements.
And the Kalman filter is used for receiving the first frequency, the first amplitude, the phase, the second frequency and the second amplitude and performing Kalman filtering calculation to obtain the final amplitude, the final phase and the final frequency of the voltage signal. Specifically, as shown in fig. 1, the Kalman Filter receives an input signal phase, a first amplitude, a first frequency signal generated by the PPLL phase-locked loop, and a second amplitude, a second frequency signal generated by the zero-crossing-point-like detection device as input signals, uses the phase, the first amplitude, and the first frequency as output predicted values of the single-phase electric phase-locked loop system, and uses the second amplitude and the second frequency as detection output values of the single-phase electric phase-locked loop system; the output predicted value and the detection output value are multiplied by Kalman gain of a Kalman filter respectively and then are added to be used as the output value of the Kalman filter, the final amplitude, the final phase and the final frequency of the input signal are obtained according to the output value, and single-phase locking is achieved according to the final amplitude, the final phase and the final frequency.
In order to further improve the accuracy of phase locking, the kalman filter in this embodiment adjusts the kalman gain in an iterative manner until the covariance between the output value of the kalman filter and the actual value of the single-phase electric phase-locked loop system is minimum.
Fig. 4 schematically shows a phase locking flowchart of a phase locking apparatus according to a first embodiment of the present invention, and as shown in fig. 4, the method may include:
step A: an uncontrolled rectified voltage input signal is received.
And B: the input signal is passed to a comparator and sampling system (as shown in figure 3).
And C: the sampling system performs analog-to-digital conversion on the input signal to obtain a discrete input signal, and transmits the discrete input signal to the PPLL calculation module and the maximum method amplitude detection module of the phase-locked calculation unit respectively to iteratively calculate the voltage amplitude, the phase and the frequency.
Step D: the PPLL calculation module calculates a first amplitude, a first frequency and a phase of the current input voltage and transmits the first amplitude, the first frequency and the phase to the Kalman filter.
Step E: the quasi-zero-crossing detection module records the rising edge time and the falling edge time of the comparator respectively, calculates the second frequency of the current input voltage at the falling edge moment of the comparator, calculates the second amplitude of the current period voltage by using a maximum value method, and finally transmits the second amplitude to the Kalman filter.
Step F: the Kalman filter takes the phase, the first amplitude and the first frequency as output predicted values of a single-phase electric phase-locked loop system model, takes the second amplitude and the second frequency as detection output values of the single-phase electric phase-locked loop system, multiplies the system detection output values by Kalman gain by the system model output predicted values and the system detection output values, and then adds the system detection output values as output values of the Kalman filter to obtain a final amplitude, a final phase and a final frequency.
Step G: and the Kalman filter adjusts the Kalman gain in an iterative mode to realize the minimum covariance of the output value of the Kalman filter and the real value of the system.
The phase-locking device provided by the embodiment cascades the PPLL phase-locking method and the zero-crossing-point-like detection phase-locking method through the extended Kalman filtering, combines the advantages of the two phase-locking methods, and utilizes the advantages of the Kalman filtering that the sampling error can be greatly eliminated and the response speed of recursive computation is high, so that the phase-locking function of the single-phase electric system with fast and accurate voltage or current signals is realized, and the dynamic performance and the static performance of the traditional phase-locking loop are far exceeded. Moreover, the zero crossing point-like detection device designed by the embodiment can quickly realize zero crossing detection, and further improves the phase locking speed of the phase locking device.
Example two
The embodiment provides an air conditioner, which comprises the phase locking device, and the air conditioner can realize single-phase locking by using the phase locking device. The air conditioner has the advantages of the phase locking device, and the description is omitted.
Although the present invention is disclosed above, the present invention is not limited thereto. Various changes and modifications may be effected therein by one skilled in the art without departing from the spirit and scope of the invention as defined in the appended claims.
Claims (7)
1. A phase-locking apparatus for a single-phase-lock of an air conditioner, comprising:
the PPLL phase-locked loop is used for calculating a first frequency, a first amplitude and a phase of the electric signal according to the electric signal after the uncontrolled rectifier bridge;
the zero-crossing-like detection device is used for detecting a second amplitude of the electric signal, performing zero-crossing matching detection on the electric signal after the uncontrolled rectifier bridge, and calculating to obtain a second frequency of the electric signal according to a moment corresponding to the zero-crossing point of the electric signal;
the Kalman filter is used for receiving the first frequency, the first amplitude, the phase, the second frequency and the second amplitude and performing Kalman filtering calculation to obtain a final amplitude, a final phase and a final frequency of the electric signal;
the zero-crossing-like point detection device includes:
the zero crossing point-like frequency detection module is used for carrying out zero crossing point matching detection on the electric signal after the uncontrolled rectifier bridge and calculating to obtain a second frequency of the electric signal according to the time corresponding to the zero crossing point;
the maximum value method amplitude detection module is used for detecting the maximum value of the electric signal in one period and obtaining the second amplitude according to the maximum value;
the zero-crossing-like frequency detection module comprises:
the detection device is used for detecting the voltage value or the current value of the electric signal output by the uncontrolled rectifier bridge;
the comparator is used for judging whether the voltage value or the current value passes through a preset voltage value or a preset current value or not and outputting an electrical frequency signal when the voltage value or the current value passes through the preset voltage value or the preset current value;
the micro control unit is used for triggering interruption when the comparator outputs an electrical signal, recording the current triggering time, and calculating the frequency of the electrical signal output by the uncontrolled rectifier bridge at present according to the current triggering time;
when the voltage value or the current value passes through the preset voltage value or the preset current value for the first time, the comparator outputs high electric frequency, and the micro control unit detects the rising edge of the high electric frequency and triggers interruption;
when the voltage value or the current value passes through the preset voltage value or the preset current value again, the comparator outputs low electric frequency, and the micro control unit detects the falling edge of the low electric frequency and triggers interruption;
the quasi-zero-crossing detection module records the rising edge time and the falling edge time of the comparator respectively, calculates the second frequency of the current input voltage at the falling edge moment of the comparator, calculates the second amplitude of the current period voltage by using a maximum value method, and finally transmits the second amplitude to the Kalman filter.
2. The phase-locking apparatus according to claim 1, wherein the comparator includes a device or circuit that outputs different electrical frequency signals according to the input voltage or current.
3. The phase-locking device according to claim 1, further comprising:
and the analog-to-digital conversion module is used for converting the electric signal after the uncontrolled rectifier bridge into a discrete signal and inputting the discrete signal into the PPLL phase-locked loop and the maximum amplitude detection module.
4. The phase-locking apparatus of claim 1, wherein the PPLL phase-locked loop calculates the electrical signal in a closed loop to obtain the first frequency, the first amplitude, and the phase.
5. The phase-locking device according to claim 1, wherein the kalman filter uses the phase, the first amplitude, and the first frequency as predicted output values of the single-phase electric phase-locked loop system, and uses the second amplitude and the second frequency as detected output values of the single-phase electric phase-locked loop system;
and respectively multiplying the output predicted value and the detection output value by a Kalman gain of a Kalman filter, and adding the multiplied values to obtain an output value of the Kalman filter, so as to obtain the final amplitude, the final phase and the final frequency according to the output value.
6. The phase-locking apparatus of claim 5, wherein the Kalman filter iteratively adjusts the Kalman gain until the covariance of the Kalman filter output and the true value of the single-phase electric phase-locked loop system is minimal.
7. An air conditioner comprising the phase-locking device as claimed in any one of claims 1 to 6, wherein the air conditioner can achieve single-phase-locking by using the phase-locking device.
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| CN201260080Y (en) * | 2008-08-29 | 2009-06-17 | 东莞市友美电源设备有限公司 | Device for passive compensation and harmonic wave control for intelligent electric power system |
| CN103178845A (en) * | 2013-03-04 | 2013-06-26 | 安徽省电力公司宣城供电公司 | Phase-locked loop and method for measuring voltage phase and frequency |
| CN104410408A (en) * | 2014-12-25 | 2015-03-11 | 国家电网公司 | Single phase locking method and device |
| CN204465509U (en) * | 2014-12-25 | 2015-07-08 | 国家电网公司 | A kind of single-phase phase-locking device |
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201260080Y (en) * | 2008-08-29 | 2009-06-17 | 东莞市友美电源设备有限公司 | Device for passive compensation and harmonic wave control for intelligent electric power system |
| CN103178845A (en) * | 2013-03-04 | 2013-06-26 | 安徽省电力公司宣城供电公司 | Phase-locked loop and method for measuring voltage phase and frequency |
| CN104410408A (en) * | 2014-12-25 | 2015-03-11 | 国家电网公司 | Single phase locking method and device |
| CN204465509U (en) * | 2014-12-25 | 2015-07-08 | 国家电网公司 | A kind of single-phase phase-locking device |
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