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Equivalent modeling method suitable for ISOP type DC-DC converter composed of DAB

A technology of DC-DC and equivalent modeling, which is applied to instruments, special data processing applications, electrical digital data processing, etc., and can solve the problems of large demand for simulation resources and low simulation efficiency of ISOP DC-DC converters

Inactive Publication Date: 2019-12-13
NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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Problems solved by technology

[0003] The present invention aims at the large demand for simulation resources of the ISOP DC-DC converter and the low simulation efficiency. Taking the typical dual active bridge structure as an example, the invention proposes an equivalent method for the ISOP DC-DC converter composed of DAB. modeling method

Method used

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  • Equivalent modeling method suitable for ISOP type DC-DC converter composed of DAB
  • Equivalent modeling method suitable for ISOP type DC-DC converter composed of DAB
  • Equivalent modeling method suitable for ISOP type DC-DC converter composed of DAB

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Embodiment Construction

[0017] The present invention provides an equivalent modeling method suitable for an ISOP type DC-DC converter composed of DAB; the modeling steps of the present invention will be further described in detail below.

[0018] Step 1: Process the switch group, inductor, capacitor and transformer respectively to form the accompanying network of the ISOP type DC-DC converter, such as figure 1 shown.

[0019] figure 2 The IGBT switch group shown in (a) can be regarded as a variable resistor switching between high and low resistance values, as shown in formula (1).

[0020]

[0021] The inductance and capacitance are discretized by the trapezoidal integral method, and the reference direction is as follows figure 2 shown, available figure 2 The adjoint networks shown in (d) and (f) have parameters as shown in equations (2) and (3) respectively:

[0022]

[0023]

[0024] G L and G C is the equivalent conductance, Vt is the simulation step size, J L_HIS and J C_HIS i...

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Abstract

The invention designs an equivalent modeling method suitable for an ISOP type DC-DC converter composed of DAB. According to the core technical scheme, the method comprises the steps that 1, inductance, capacitance and transformer elements of all DAB are discretized through a trapezoidal integral method, and a DC-DC converter accompanying network is formed; 2, a cut set network equation is listed,the internal nodes of the DAB unit and the internal nodes of the DC-DC converter are sequentially eliminated by utilizing the thought of a fast nesting solving algorithm, and an equivalent circuit expression of the DC-DC converter is obtained through equation transformation; 3, the equivalent circuit of the DC-DC converter is combined with an external circuit, and external node information is solved by using an electromagnetic transient simulation program; and 4, the port and internal node information of the DAB unit are inversely solved.

Description

technical field [0001] The invention relates to an equivalent modeling method suitable for an ISOP type DC-DC converter composed of DAB, and belongs to the technical field of flexible direct current transmission. Background technique [0002] Power electronic transformer (power electronic transformer, PET) has become an important solution to solve the problem of continuously increasing voltage levels of transmission and distribution networks and the integration of renewable energy into the grid. In order to solve the contradiction between the continuous improvement of voltage level and the limited withstand voltage level of power electronic devices, the commonly used PET topology mostly includes DC-DC converters with ISOP structure, and the number of power electronic devices, energy storage components and high-frequency transformers has increased significantly. The demand is high. Due to the existence of high-frequency transformers, the simulation of the ISOP type DC-DC con...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F17/50
Inventor 许建中高晨祥丁江萍邓伟成赵成勇
Owner NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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