Reactive power control method of contravariant topology circuit
A topological circuit and power control technology, applied in the direction of reactive power adjustment/elimination/compensation, irreversible DC power input conversion to AC power output, reactive power compensation, etc., can solve the inverter output current waveform distortion, which cannot meet Safety requirements and other issues, to achieve the effect of good reactive power and output current waveform quality
Active Publication Date: 2015-03-04
爱士惟电力设备贸易(上海)有限公司
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attached by image 3 It can be seen from the figure that when the inverter outputs reactive power, the inverter output current waveform is distorted, and parameters such as THDI and PF values cannot meet the safety requirements
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[0030] The preferred embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings, so that the advantages and features of the present invention can be more easily understood by those skilled in the art, so as to define the protection scope of the present invention more clearly.
[0031] like figure 1 As shown, the inverter topology circuit of the present invention includes a DC current source V DC ; six switching devices, which respectively have a first end and a second end, the second end of the first switching device S1 is connected to the first end of the third switching device S3, the third switching device The second end of S3 is connected to the first end of the fifth switching device S5, and the first end of the first switching device S1 and the second end of the fifth switching device S5 are respectively connected to the direct current source V DC The second end of the second switching device S2 is connect...
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The invention discloses a reactive power control method of a contravariant topology circuit. The contravariant topology circuit comprises a DC (Direct Current) source, six switching devices, six diodes, a seventh diode, an eighth diode, a first inductance and a second inductance, wherein the six diodes are respectively and reversely connected to two ends of the six switching devices in parallel, a first end of the first inductance is connected to a second end of a first switching device, a first end of the second inductance is connected to a second end of a second switching device, and a second end of the first inductance and a second end of the second inductance are connected to two ends of an alternating-current load or an electric supply; when the voltage of the electric supply is in a positive half cycle, a fourth switching device is continuously switched on, the working states of the first switching device and a sixth switching device are the same, and the first switching device and a third switching device are in complementary work; and when the voltage of the electric supply is in a negative half cycle, the third switching device is continuously switched on, the working states of the second switching device and a fifth switching device are the same, and the second switching device and the fourth switching device are in complementary work.
Description
technical field [0001] The invention relates to a reactive power control method of an inverter topology circuit. Background technique [0002] The inverter topology circuit is a high-efficiency inverter topology, which can realize the conversion of PV direct current to AC alternating current energy when used in photovoltaic inverters, and realize grid-connected power generation of solar energy. At present, the main goal of the control method of the inverter circuit is to meet the requirement of an output power factor of 1, that is, to achieve the same phase and frequency between the inverter output current and the grid voltage through phase-locking, and the inverter output PF value is 1, all Output active power, not output reactive power. [0003] For example figure 1 As shown, the specific structure of the H6 inverter topology circuit is that the inverter bridge arm 1 is composed of switching devices S1, S3, and S5, and the inverter bridge arm 2 is composed of switching d...
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IPC IPC(8): H02M7/48H02J3/18
CPCY02E40/30
Inventor 肖俊彦孙耀杰
Owner 爱士惟电力设备贸易(上海)有限公司