A dsp-based sapf real-time phase shift detection system and its working method
A technology of phase shift detection and circuit, applied in the direction of reactive power/actual component measurement, etc., can solve problems such as asymmetry, inaccurate detection of reactive current, grid voltage waveform distortion, etc.
Active Publication Date: 2015-08-05
TIANJIN UNIVERSITY OF TECHNOLOGY
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Problems solved by technology
Currently widely used i p -i q Although the detection method can accurately detect the harmonic current in the system under the non-ideal grid voltage, it cannot accurately detect the reactive current in the system. There is a phase difference at the zero-crossing point of the fundamental wave
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Embodiment
[0032] Embodiment: a kind of real-time phase shift detection system of the SAPF based on DSP (see figure 1 ), which is characterized in that it includes a signal shaping transformation processing circuit, a DSP central data processing circuit, an isolation and driving circuit and a thyristor circuit; wherein, the input end of the signal shaping transformation processing circuit is connected to an external voltage transformer and a current transformer, Its output end is connected to the input end of the DSP central data processing circuit; the input end of the isolation and drive circuit is connected to the output end of the DSP central data processing circuit, and its output end is connected to the gate input end of the thyristor circuit.
[0033] The thyristor circuit is a three-phase gate turn-off thyristor IGBT circuit, and each phase circuit is composed of four IGBT tubes.
[0034] The signal shaping conversion processing circuit (see figure 2 ) consists of a voltage and...
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The invention discloses a DSP (Digital Signal Processor) and SAPF (Shunt Active Power Filter)-based real-time phase shift detection system, which is characterized by comprising a signal reshaping and transformation processing circuit, a DSP central data processing circuit, an isolating and driving circuit and a thyristor circuit. A working method of the DSP and SAPF-based real-time phase shift detection system comprises coordinate transformation, filtration, calculation, phase shift and coordinate inverse transformation. The system and the working method thereof have the advantages that 1 three-phase voltage distortion, and fundamental wave positive sequence active current in case of asymmetry can be detected in real time by using a real-time phase shift method, 2 the speed and the accuracy of control are improved and the system has excellent adjustment performance and reliability, 3 the device capacity and the voltage level are greatly improved, the stability of a power grid is enhanced, and operation of the entire system is prevented from being influenced by harmonic pollution, and 4 the system and the working method thereof have broad market application prospect.
Description
(1) Technical field: [0001] The invention belongs to the technical field of detection and control of a shunt active power filter (Shunt Active Power Filter—SAPF) in a power system, in particular a real-time phase detection system based on a DSP (Digital Signal Pprocessor—a high-speed digital signal processor) for a SAPF. Migration detection system and its working method. (two) background technology: [0002] The active power filter is a harmonic and reactive power compensation system based on power electronic technology, and is connected between the power supply and the harmonic source load, and has good dynamic performance and harmonic characteristics. The active power filter can be regarded as a controlled current source. Its basic working principle is to detect the harmonics and reactive currents contained in the system, and generate a compensation current equal to it and with a phase difference of 180°, and inject it into the transmission line , to offset the harmonics ...
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IPC IPC(8): G01R19/06
Inventor 马幼捷赵健周雪松
Owner TIANJIN UNIVERSITY OF TECHNOLOGY