A Control Method for Precisely Suppressing Power Network Harmonics
A control method and power grid technology, applied to the AC network to reduce harmonics/ripples, harmonic reduction devices, etc., can solve problems such as pollution, adjustment of control parameters, inability to accurately control and suppress grid harmonic voltage, and improve control The effect of resolution
Inactive Publication Date: 2018-08-21
HARBIN UNIV OF SCI & TECH +1
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Problems solved by technology
The application of all-digital grid harmonic suppression technology cannot accurately control and suppress grid harmonic voltage, so it cannot really solve the problem of grid harmonic pollution; the application of pure analog technology cannot adjust control parameters according to grid harmonic voltage in real time to control grid harmonics
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[0016] refer to figure 1 , the precise grid harmonic suppression controller designed by the present invention mainly includes a triangular wave signal unit sent by an analog circuit, a matching unit for adjusting the grid side voltage detection signal and a triangular wave signal sent by an analog circuit, a drive signal unit for comparing output power devices, and a power conversion reactor The output unit, the triangular wave signal unit sent by the analog circuit outputs a carrier signal with a fixed triangular wave amplitude and adjustable frequency; the conditioning grid side voltage detection signal and the triangular wave signal matching unit sent by the analog circuit realize the grid side voltage detection As a modulation signal, where x represents the grid three-phase voltage ABC, U m is the voltage amplitude, ω=2πf, In order to correspond to the phase of the voltage signal, the signal conditioning circuit transforms the voltage detection signal on the grid side t...
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The invention discloses a control method for accurately restraining power grid harmonics. According to the technical key points, the control method comprises the following steps that: step 1, a carrier signal of a driving signal of a power device is generated through an analog triangular wave generation circuit; and a power grid side voltage detection signal is processed by a signal conditioning circuit to output a modulation wave to a signal comparison circuit; step 2, a power grid side current detection signal is subjected to control chip A / D digitization calculation to obtain a sum of the real-time values of the voltage capable of restraining each harmonic current of the power grid, then the sum is subjected to D / A output and superposition with the modulation wave; next, the obtained value is compared with the carrier signal in the comparison circuit to obtain a PWM driving signal for the power device, wherein the PWM driving signal comprises the power grid harmonic restraining current; and step 3, the PWM driving signal is transmitted to a harmonic restraining controller; then the driving signal passes through a power conversion circuit; and the power grid harmonic restraining current is output through an electric reactor. According to the control method, the power grid side voltage measurement signal and the voltage signal of the power grid harmonic restraining current are taken as the modulating signal; then the modulating signal is directly compared with the carrier signal; and next, the driving signal capable of accurately restraining the power grid harmonics can be output.
Description
Technical field: [0001] The invention belongs to the field of power system control, and in particular relates to a control method for accurately suppressing harmonics of a power grid. Background technique: [0002] The extensive use of non-linear electrical equipment in the power grid, especially the application of power electronic equipment, while improving the level of industrial control, the nonlinearity of power electronic devices makes the harmonic pollution of the power grid increasingly serious. The application of all-digital grid harmonic suppression technology cannot accurately control and suppress grid harmonic voltage, so it cannot really solve the problem of grid harmonic pollution; the application of pure analog technology cannot adjust control parameters according to grid harmonic voltage in real time to control grid harmonics . Invention content: [0003] In order to solve the above problems, the present invention provides a control method for accurately su...
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IPC IPC(8): H02J3/01
CPCH02J3/01Y02E40/40
Inventor 康尔良谷博文韩康玮
Owner HARBIN UNIV OF SCI & TECH