Grid-connected inverter PWM (Pulse Width Modulation) control method based on measured voltage modulation
A control method and voltage modulation technology, applied in the direction of single-network parallel feeding arrangement, etc., can solve the problems of lack of real-time performance and complex implementation, and achieve the effect of simplifying the implementation process of grid-connection, improving real-time performance of grid-connection, and improving power quality
Inactive Publication Date: 2011-11-23
NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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[0009] The purpose of the present invention is to propose a PWM control method for grid-connected inverters based on measured voltage modulation, aiming at problems such as complex implementation and lack of real-time performance in current grid-connected inverter control methods
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[0028] The preferred embodiments will be described in detail below in conjunction with the accompanying drawings. It should be emphasized that the following description is only exemplary and not intended to limit the scope of the invention and its application.
[0029] figure 1 It is a flowchart of a PWM control method for a grid-connected inverter based on measured voltage modulation, figure 1 Among them, the PWM control method of the grid-connected inverter based on the measured voltage modulation provided by the present invention includes:
[0030] Step 101: Collect the grid side line voltage.
[0031] The line voltage is collected through a sampling program. During specific implementation, only any two of the three line voltages can be collected, and the third can be obtained by calculation. For example, you can only collect the line voltage and line voltage Derived from the sum of the three line-to-line voltage phasors in a three-phase system.
[0032] Step 102:...
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The invention discloses a grid-connected inverter PWM (Pulse Width Modulation) control method based on measured voltage modulation in the technical field of power system control. The grid-connected inverter PWM (Pulse Width Modulation) control method comprises the steps of: acquiring line voltages at a power grid side; calculating three phases of phase voltages according to the line voltages at the power grid side; after subjecting the three phases of phase voltages to forward phase shifting and setting phase positions, comparing the three phases of phase voltages with a triangular carrier inside a PWM modulation circuit and generating PWM waves, wherein the PWM waves are taken as driving pulses of an inverter to drive the inverter for grid connection; acquiring three phases of phase currents at the present moment; calculating phase differences between the three phases of phase currents and the three phase of phase voltages; judging whether the power of a power grid is completely compensated by active power / passive power output by the inverter, if so, ending the process; or else, regulating the set phases and the increments of the three phases of phase voltage, and returning to the phase shifting step for the three phases of the phase voltages. According to the invention, the active power or the passive power of the power grid can be compensated correspondingly at the same time when a grid-connected implementation process is simplified and the instantaneity of grid connection is increased, so that the electric energy quality of the power grid is further improved.
Description
technical field [0001] The invention belongs to the technical field of power system control, and in particular relates to a PWM control method of a grid-connected inverter based on measured voltage modulation. Background technique [0002] With the decreasing and shortage of fossil energy, as well as our government's emphasis on environmental protection and new energy development, the government and power grid companies have introduced a series of policies to advocate and encourage the development of new energy, in order to achieve the purpose of energy saving, emission reduction and environmental protection . Local governments, relevant enterprises and scientific research institutes in the industry are actively developing and applying new energy sources. [0003] At present, new energy power generation is developing rapidly all over the world, and grid-connected inverters are more and more widely used. Grid-connected inverters can effectively realize grid-connected, but i...
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IPC IPC(8): H02J3/38
Inventor 韩民晓林少伯
Owner NORTH CHINA ELECTRIC POWER UNIV (BAODING)