Patent
Sliding weighting single-phase soft phase locking method based on reactive compensation
Guo Duowen,Xu Jin,Liu Wei,Sun Shanqin +3 more
- 01 Jan 2014
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TL;DR: In this paper, a sliding weighting single-phase soft phase locking method based on reactive compensation was proposed to achieve fast frequency response and accurate phase locking deviation at the same time, the key point is that the output of the beta semaphore is generated accurately and the output is made to be zero through a q-axis component obtained through dq transformation and through PI adjustment, the adjusted output quantity controls frequency, and the purpose of phase locking is achieved.
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Abstract: The invention discloses a sliding weighting single-phase soft phase locking method based on reactive compensation. According to the method, in order to guaranteeing that a single-phase grid-connected inverter can gain good performance, soft phase locking is achieved, fast frequency response and accurate phase locking deviation can be obtained at the same time, the key point is that beta semaphore is generated accurately and the output of the beta semaphore is made to be zero through a q-axis component obtained through dq transformation and through PI adjustment, the adjusted output quantity controls frequency, and the purpose of phase locking is achieved. Positive and negative zero sequence cross decoupling is carried out on transformation results by using two sets of Park transformation with reversed rotating directions, orthometric virtual quantity with 90-degree phase shifting is added to a system to carry out feedback regulation to eliminate noise interference in a single-phase system, therefore, the q-axis component obtained through phase locking is made to be more accurate, and the response speed is made to be faster.
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Citations
Patent
Single phase locking method and device
Deng Zhe,Zhao Bo,Zhang Xuesong,Wang Ke,Wang Ziling +4 more
- 11 Mar 2015
TL;DR: In this paper, a Kalman filter is used for combing a zero crossing point detection phase locker and a DQ coordinate system phase locker to obtain a final phase position, a final amplitude and a final frequency.
6
Patent
Single phase voltage digital phase locking method
Yi Longqiang,Wang Dingfu,Cai Zhongshan +2 more
- 20 Jun 2017
TL;DR: In this article, a single phase voltage digital phase locking method was proposed, where the current sampling point of the voltage signal to be measured and a previous (k-n)th sampling point are used to form level vectors.
2
Patent
Digital phase locking method applied to active power filter
Lin Daofei,Jin Liangzan,Lin Tingting +2 more
- 03 Dec 2014
TL;DR: In this paper, a digital phase locking method applied to an active power filter is described, with the characteristic that the spatial rotation curve of a three-phase system is the same as that of a phase A, and trigonometric values of the current phase of the system can be worked out in real time by applying the mathematic trigonometrical conversion relationships.
1
Patent
Single-phase voltage phase-locking method based on tracking differentiator
Rongkun Wang,Qiyong Chen,Sigun Sun,Dong Yan,Jie Wang +4 more
- 04 Sep 2018
TL;DR: In this article, a single-phase voltage phase-locking method based on a tracking differentiator is proposed, which comprises a step of generating orthogonal signals x1(k) and x2(k), carrying out amplitude calibration on the signals x 1k and x 2k, and carrying out alpha beta -dq coordination transformation on the signal to obtain a phase difference component uq(k).
Patent
Dq impedance measurement method for single-phase alternating current system
Liu Zhigang,Wu Siqi +1 more
- 19 Jun 2020
TL;DR: In this paper, a dq impedance measurement method for a single-phase alternating current system is proposed, which consists of injecting disturbance, and measuring a response current and voltage of the system; step 2, acquiring phases and peak values of currents and voltages with corresponding frequencies omega1+omegap and omega1-omegap in an alpha axis through a fast Fourier transform FFT method; step 3, respectively converting the response current under the alpha-beta coordinate system into the dq coordinate system, and step 5, calculating a total response current, and a total voltage
References
Patent
Control method of single-phase phase locked loop based on second-order integrator
Fuqiang Xu,Wu Chunhua,Huang Jianming +2 more
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TL;DR: In this paper, a control method of a single-phase phase locked loop based on a second-order integrator is presented, which can exactly and rapidly lock the phase position under the conditions that the grid frequency changes and the voltage distorts.
6
Patent
Single-phase phase-locked loop
Shi Wei,Yang Hao,Wang Yu,Yang Bing,Fang Taixun,Liu Weiqun +5 more
- 01 May 2013
TL;DR: In this paper, a single-phase phase-locked loop consisting of a phase discriminator, a loop filter and a voltage-controlled oscillator is presented, which can accurately track the phase and amplitude of a power grid when the phase of the power grid varies.
5
Patent
High speed lock-up phase locked loop circuit
Makoto Mizokuchi
- 16 Apr 1999
TL;DR: In this article, a phase comparator is connected to a phase-locked loop circuit for receiving output signals from phase comparators, and a switching operation control circuit is also connected to the phase-locked circuit for transmitting selected first and second switching control signals to the response speed switching circuit.
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