A power frequency power electronic transformer and its realization method
A technology of industrial frequency transformers and power electronics, applied in the direction of electrical components, circuit devices, AC network circuits, etc., can solve problems such as low power factor, low reliability, and low efficiency, and achieve low cost, high reliability, and good power. quality effect
Inactive Publication Date: 2018-01-30
HOHAI UNIV
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Problems solved by technology
[0003] Since the existing power electronic transformer adopts a five-level conversion structure and directly connects power electronic equipment to the grid, it has low capacity, low efficiency, and low reliability.
In the power system, there is always a certain degree of asymmetry in the load. When this asymmetric load is connected to the grid, a negative sequence current will appear on the low-voltage side of the traditional power electronic transformer, and the power factor is also low, thus improving the power quality. The effect is not ideal
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[0035] The present invention will be further described below in conjunction with the accompanying drawings. The following examples are only used to illustrate the technical solution of the present invention more clearly, but not to limit the protection scope of the present invention.
[0036] like figure 1 Shown is a schematic diagram of the system structure of a power frequency power electronic transformer of the present invention, which includes a three-winding power frequency transformer, a voltage source converter VSC 1 , voltage source converter VSC group, measuring element HT, measuring element LT, DC capacitance voltage measuring element DCPT, DC capacitor and controller, the controller includes input link, control link, man-machine interface subsystem and output link. The controller collects the current and voltage of the high-voltage side of the three-winding power frequency transformer, the current and voltage of the low-voltage first winding, and the DC capacitor v...
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The invention discloses a novel power frequency power electronic transformer and a realization method thereof, and belongs to the field of electric energy transmission and electric energy quality control applied to a power grid by electric power electronic technology. The present invention includes a three-winding power frequency transformer, a voltage source converter VSC1, a voltage source converter VSC group, a DC capacitor, and a controller, and collects the current and voltage of the high-voltage side of the three-winding power frequency transformer and the low-voltage first winding in real time According to the current and voltage of the current system, calculate the reactive power shortage and negative sequence current of the current system, and formulate a corresponding more direct, fine and selective compensation scheme according to the compensation capacity and the current component state of the low voltage side. The AC output of the first winding VSC group compensates the reactive power of the grid and allocates active power to effectively reduce the negative sequence current on the low-voltage side and improve the power factor on the low-voltage side. The invention has the advantages of large capacity, low cost, high reliability and good compatibility.
Description
technical field [0001] The invention relates to a power frequency power electronic transformer and its implementation method, which belongs to the field of electric energy transmission and power quality control applied to power grids by power electronics technology, relates to negative sequence and reactive power control devices of distribution networks, and is suitable for distribution networks of the substation. Background technique [0002] The existing power electronic transformer (Power Electronic Transformer, PET) is a power conversion device that contains a power electronic converter and realizes magnetic coupling through a high-frequency transformer. It realizes the voltage in the power system through power electronic conversion technology and a high-frequency transformer. Transformation and energy transfer to improve the power quality of the power supply. [0003] Since the existing power electronic transformer adopts a five-level conversion structure and directly ...
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IPC IPC(8): H02M5/10H02J3/00H02J3/18
CPCY02E40/30
Inventor 陈谦齐贝贝孙萌鞠平金宇清余方召唐莹莹
Owner HOHAI UNIV