Bidirectional high-voltage DC converter topology with filter bridge

Abstract

The present invention discloses a bidirectional high-voltage DC converter topology with a filter bridge arm, wherein the bidirectional high-voltage DC converter topology is constructed by a power transmission unit and a filter bridge arm unit, wherein: the low-voltage side port of the power transmission unit U L In parallel with the input port of the filter bridge unit, the high-voltage side port of the power transmission unit U H The present invention requires fewer submodules than high-voltage, high-capacity DC converters based on modular multilevel converters. Three bridge arms are required, and each bridge arm only needs to output a certain DC voltage, eliminating the need for additional AC voltage components. This reduces the need for submodules.

Description

Technical Field

[0001] The present invention belongs to the technical field of power electronics and relates to a direct current voltage converter, in particular to a bidirectional high-voltage direct current converter with a filter bridge arm. Background Art

[0002] HVDC transmission technology boasts low transmission losses and zero reactive power, offering significant advantages in large-capacity, long-distance power transmission. It has been widely adopted in areas such as renewable energy transmission and national and regional interconnection. To build DC grids and further enhance the flexibility and reliability of HVDC transmission, high-voltage, high-capacity DC converters are required to connect DC lines of varying voltage levels.

[0003] For high-voltage, high-capacity DC converters, converter structures such as "face-to-face" and "DC autocoupler" are based on the optimization and modification of modular multilevel converters. Power transmission requires a large-capacity transformer and involves both rectification and inversion. This results in a large number of components, bulk, and high cost, making these structures difficult to implement in practice.

[0004] CN106160463B discloses a DC voltage conversion device consisting of a multiphase device cascade structure and a submodule cascade structure. The alternating power transfer of the submodule cascade structure eliminates the need for bulky passive components, saving converter volume and cost. However, the device requires an excessive number of cascaded devices, resulting in high costs, increased system control complexity, and reduced reliability. Summary of the Invention

[0005] In order to solve the above problems existing in the prior art, the present invention provides a bidirectional high-voltage DC converter topology including a filter bridge arm.

[0006] The purpose of the present invention is achieved through the following technical solutions:

[0007] A bidirectional high-voltage DC converter topology with a filter bridge arm is constructed from a power transmission unit and a filter bridge arm unit, wherein:

[0008] The low-voltage side port of the power transmission unit U L In parallel with the input port of the filter bridge unit, the high-voltage side port of the power transmission unit U H connected in parallel with the output port of the filter bridge arm unit;

[0009] The power transmission unit is used to alternately transfer energy between the high and low voltage sides through the cooperation of the energy storage bridge arm and the switch;

[0010] The filter bridge arm unit is used to compensate for the discontinuous current generated by the power transmission unit on the high and low voltage sides, ensuring smooth and continuous transmission of the high and low voltage side currents.

[0011] In the present invention, the power transmission unit has three unit structures: Type 1, Type 2, and Type 3. The specific structures are as follows:

[0012] The type 1 power transmission unit is composed of two switching devices S1 and S2, an energy storage bridge arm, an inductor L and four terminals. Terminal 1 is connected to one end of the switching device S1, the other end of the switching device S1 is connected to the inductor L and one end of the switching device S2, the other end of the inductor L is connected to one end of the energy storage bridge arm, the other end of the energy storage bridge arm is connected to terminals 2 and 4, the other end of the switching device S2 is connected to terminal 3, and terminals 1 and 2 are connected to the low-voltage side port U L , terminals 3 and 4 are connected to the high voltage side port U H , low pressure side port U L In parallel with the input port of the filter bridge unit, the high-voltage side port U H connected in parallel with the output port of the filter bridge arm unit;

[0013] The type 2 power transmission unit is composed of two switching devices S1 and S2, an energy storage bridge arm, an inductor L and four terminals. Terminal 1 is connected to one end of the switching device S2, the other end of the switching device S2 is connected to the inductor L and one end of the switching device S1, the other end of the inductor L is connected to one end of the energy storage bridge arm, the other end of the energy storage bridge arm is connected to terminal 3, the other end of the switching device S1 is connected to terminals 2 and 4, and terminals 1 and 2 are connected to the low-voltage side port U L , terminals 3 and 4 are connected to the high voltage side port U H , low pressure side port U L In parallel with the input port of the filter bridge unit, the high-voltage side port U H connected in parallel with the output port of the filter bridge arm unit;

[0014] The type 3 power transmission unit is composed of two switching devices S1 and S2, an energy storage bridge arm, an inductor L and four terminals. Terminal 3 is connected to one end of the switching device S1, the other end of the switching device S1 is connected to the inductor L and one end of the switching device S2, the other end of the switching device S2 is connected to terminals 2 and 4, the other end of the inductor L is connected to one end of the energy storage bridge arm, the other end of the energy storage bridge arm is connected to terminal 1, and terminals 1 and 2 are connected to the low-voltage side port U L, terminals 3 and 4 are connected to the high voltage side port U H , low pressure side port U L In parallel with the input port of the filter bridge unit, the high-voltage side port U H Connected in parallel with the output port of the filter bridge arm unit.

[0015] In the present invention, the filter bridge arm unit has three unit structures: Type 1, Type 2, and Type 3. The specific structures are as follows:

[0016] The type 1 filter bridge arm unit consists of two filter bridge arms, two inductors L1 and L2, and four terminals. The input terminal 1 is connected to one end of the inductors L1 and L2, and the other ends of the inductors L1 and L2 are connected to one end of the filter bridge arm 1 and the filter bridge arm 2 respectively. The other end of the filter bridge arm 1 is connected to the input terminal 2 and the output terminal 2, and the other end of the filter bridge arm 2 is connected to the output terminal 1. The input terminal 1 and the input terminal 2 are connected to the input port, and the output terminal 1 and the output terminal 2 are connected to the output port.

[0017] The type 2 filter bridge arm unit consists of two filter bridge arms, two inductors L1 and L2, and four terminals. The input terminal 1 is connected to one end of the inductor L1, the other end of the inductor L1 is connected to one end of the filter bridge arm 1, the other end of the filter bridge arm 1 is connected to one end of the inductor L2 and the output terminal 1, the other end of the inductor L2 is connected to one end of the filter bridge arm 2, the other end of the filter bridge arm 2 is connected to the input terminal 2 and the output terminal 2, the input terminal 1 and the input terminal 2 are connected to the input port, and the output terminal 1 and the output terminal 2 are connected to the output port.

[0018] The type 3 filter bridge arm unit is composed of two filter bridge arms, two inductors L1 and L2, and four terminals. The input terminal 1 is connected to one end of the inductor L1, the other end of the inductor L1 is connected to one end of the filter bridge arm 1, the output terminal 1 is connected to one end of the inductor L2, the other end of the inductor L2 is connected to one end of the filter bridge arm 2, the other end of the filter bridge arm 1 is connected to the input terminal 2, and the other end of the filter bridge arm 2 is connected to the output terminal 2. The input terminal 1 and the input terminal 2 are connected to the input port, and the output terminal 1 and the output terminal 2 are connected to the output port.

[0019] In the present invention, the filtering bridge arm and the energy storage bridge arm can be composed of a cascade of full-bridge submodules, a cascade of half-bridge submodules, or a mixed cascade of full-bridge submodules and half-bridge submodules.

[0020] In the present invention, the switching devices S1 and S2 may be composed of two half-controlled thyristor devices connected in series and in anti-parallel.

[0021] In the present invention, the low-voltage side port of any of the above power transmission units UL and high-voltage side port U H , respectively connected to the input port and output port of any of the above-mentioned filter bridge arm units, can form a bidirectional high-voltage DC converter topology containing a filter bridge arm, specifically including the following nine topologies from Type I to Type IX:

[0022] 1. A type I bidirectional high-voltage DC converter topology with a filter bridge arm, consisting of a type I power transmission unit and a type I filter bridge arm unit;

[0023] 2. A type II bidirectional high-voltage DC converter topology with a filter bridge arm, consisting of a type 1 power transmission unit and a type 2 filter bridge arm unit;

[0024] 3. A type III bidirectional high-voltage DC converter topology with a filter bridge arm, consisting of a type 1 power transmission unit and a type 3 filter bridge arm unit;

[0025] 4. A type IV bidirectional high-voltage DC converter topology with a filter bridge arm, consisting of a type 2 power transmission unit and a type 1 filter bridge arm unit;

[0026] 5. A V-type bidirectional high-voltage DC converter topology with a filter bridge arm, consisting of a Type 2 power transmission unit and a Type 2 filter bridge arm unit;

[0027] 6. A type VI bidirectional high-voltage DC converter topology with a filter bridge arm, consisting of a type 2 power transmission unit and a type 3 filter bridge arm unit;

[0028] 7. A type VII bidirectional high-voltage DC converter topology with a filter bridge arm, consisting of a type 3 power transmission unit and a type 1 filter bridge arm unit;

[0029] 8. A type VIII bidirectional high-voltage DC converter topology with a filter bridge arm, consisting of a type 3 power transmission unit and a type 2 filter bridge arm unit;

[0030] 9. A type IX bidirectional high-voltage DC converter topology with a filter bridge arm consisting of a type 3 power transmission unit and a type 3 filter bridge arm unit.

[0031] Compared with the prior art, the present invention has the following advantages:

[0032] 1. Compared to high-voltage, high-capacity DC converters based on modular multilevel converters, the present invention requires fewer submodules. The present invention requires three bridge arms, each of which only needs to output a certain DC voltage, without the need to output additional AC voltage components, thus reducing the need for submodules.

[0033] 2. Compared to multiphase device cascades and submodule cascades in DC converters, the present invention requires fewer device cascade structures. To achieve continuous and smooth power transmission, multiphase device cascades and submodule cascades in DC converters require six or more device cascade structures. However, the present invention uses only two device cascade structures, saving on the number of device cascade structures. This further reduces the number of auxiliary components such as device drivers and cooling, reducing system complexity and improving reliability. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 The basic structural connection diagram of the bidirectional high-voltage DC converter topology with a filter bridge arm;

[0035] Figure 2 Three power transmission unit structure diagrams, where (a) is the structure of type 1 power transmission unit; (b) is the structure of type 2 power transmission unit; (c) is the structure of type 3 power transmission unit;

[0036] Figure 3 The following are three types of filter bridge arm unit structures: (a) is the type 1 filter bridge arm unit structure; (b) is the type 2 filter bridge arm unit structure; (c) is the type 3 filter bridge arm unit structure;

[0037] Figure 4 This is the circuit structure diagram of the energy storage bridge arm and the filter bridge arm;

[0038] Figure 5 is a circuit structure diagram of a switching device;

[0039] Figure 6 The topological structure diagram of the type I bidirectional high-voltage DC converter with a filter bridge arm;

[0040] Figure 7 The topological structure diagram of the type II bidirectional high-voltage DC converter with a filter bridge arm;

[0041] Figure 8 The topological structure diagram of the type III bidirectional high-voltage DC converter with a filter bridge arm;

[0042] Figure 9 The topological structure diagram of the IV-type bidirectional high-voltage DC converter with a filter bridge arm;

[0043] Figure 10 The topological structure diagram of a V-type bidirectional high-voltage DC converter with a filter bridge arm;

[0044] Figure 11 The topological structure diagram of the VI-type bidirectional high-voltage DC converter with a filter bridge arm;

[0045] Figure 12 The topological structure diagram of the VII-type bidirectional high-voltage DC converter with a filter bridge arm;

[0046] Figure 13 The topological structure diagram of the Type VIII bidirectional high-voltage DC converter with a filter bridge arm;

[0047] Figure 14 This is the topology diagram of a Type IX bidirectional high-voltage DC converter with a filter bridge arm. DETAILED DESCRIPTION

[0048] The technical solution of the present invention is further described below with reference to the accompanying drawings, but is not limited thereto. Any modification or equivalent replacement of the technical solution of the present invention that does not depart from the spirit and scope of the technical solution of the present invention should be included in the scope of protection of the present invention.

[0049] The present invention discloses a bidirectional high-voltage DC converter topology with a filter bridge arm. The bidirectional high-voltage DC converter topology has nine types of topological structures, namely, type I to type IX. The common feature of the nine topological structures is that they are all composed of a power transmission unit and a filter bridge arm unit. The low-voltage side port of the power transmission unit is connected to the power transmission unit. U L Both are connected in parallel with the input port of the filter bridge unit and the high-voltage side port of the power transmission unit U H Both are connected in parallel with the output port of the filter bridge arm unit, and the different feature is that the structures of the power transmission unit and the filter bridge arm unit are different.

[0050] Figure 1 The basic structure connection diagram of the bidirectional high-voltage DC converter topology with a filter bridge arm is as follows: the input port of the filter bridge arm unit and the low-voltage side port of the power transmission unit U L In parallel, the output port of the filter bridge arm unit is connected in parallel with the high voltage side of the power transmission unit.

[0051] Figure 2 (a) to (c) are type 1 to type 3 power transmission unit structures. The common feature of this group of unit structures is that they are composed of two switching devices S1 and S2, a storage bridge arm, an inductor L and four terminals. Terminals 1 and 2 are connected to the low-voltage side port. U L , terminals 3 and 4 are connected to the high voltage side port U H The difference lies in the different connection methods between the four terminals and the two switching devices, the energy storage bridge arm and the inductor. The specific structure is as follows:

[0052] Type 1 power transmission unit: Terminal 1 is connected to one end of the switching device S1, the other end of the switching device S1 is connected to the inductor L and one end of the switching device S2, the other end of the inductor L is connected to one end of the energy storage bridge arm, the other end of the energy storage bridge arm is connected to terminals 2 and terminal 4, and the other end of the switching device S2 is connected to terminal 3.

[0053] Type 2 power transmission unit: Terminal 1 is connected to one end of the switching device S2, the other end of the switching device S2 is connected to the inductor L and one end of the switching device S1, the other end of the inductor L is connected to one end of the energy storage bridge arm, the other end of the energy storage bridge arm is connected to terminal 3, and the other end of the switching device S1 is connected to terminals 2 and 4.

[0054] Type 3 power transmission unit: Terminal 3 is connected to one end of the switching device S1, the other end of the switching device S1 is connected to the inductor L and one end of the switching device S2, the other end of S2 is connected to terminals 2 and 4, the other end of the inductor L is connected to one end of the energy storage bridge arm, and the other end of the energy storage bridge arm is connected to terminal 1.

[0055] Figure 3 (a) to (c) are type 1 to type 3 filter bridge arm unit structures. The common feature of this group of unit structures is that they are composed of two filter bridge arms, two inductors L1 and L2, and four terminals. Input terminals 1 and 2 are connected to the input port, and output terminals 1 and 2 are connected to the output port. The different features are that the four terminals are connected to the two filter bridge arms and two inductors in different ways. The specific structure is as follows:

[0056] Type 1 filter bridge arm unit: input terminal 1 is connected to one end of inductors L1 and L2, the other ends of inductors L1 and L2 are connected to one end of filter bridge arm 1 and filter bridge arm 2 respectively, the other end of filter bridge arm 1 is connected to input terminal 2 and output terminal 2, and the other end of filter bridge arm 2 is connected to output terminal 1.

[0057] Type 2 filter bridge arm unit: input terminal 1 is connected to one end of inductor L1, the other end of inductor L1 is connected to one end of filter bridge arm 1, the other end of filter bridge arm 1 is connected to one end of inductor L2 and output terminal 1, the other end of inductor L2 is connected to one end of filter bridge arm 2, and the other end of filter bridge arm 2 is connected to input terminal 2 and output terminal 2.

[0058] Type 3 filter bridge arm unit: input terminal 1 is connected to one end of inductor L1, the other end of inductor L1 is connected to one end of filter bridge arm 1, output terminal 1 is connected to one end of inductor L2, the other end of inductor L2 is connected to one end of filter bridge arm 2, the other end of filter bridge arm 1 is connected to input terminal 2 and the other end of filter bridge arm 2, and the other end of filter bridge arm 2 is connected to output terminal 2.

[0059] Figure 4Figure 3 is the internal circuit structure diagram of the filter bridge arm and the energy storage bridge arm. Both the filter bridge arm and the energy storage bridge arm can be composed of a cascade of full-bridge sub-modules, a cascade of half-bridge sub-modules, or a mixed cascade of full-bridge sub-modules and half-bridge sub-modules.

[0060] Figure 5 The actual circuit structure diagram of the switching device is shown in FIG. 1 . The switching device can be composed of two half-controlled thyristor devices connected in series and in anti-parallel.

[0061] Figures 6 to 14 This is a diagram of the type I to type IX filter bridge arm topology structure consisting of a power transmission unit and a filter bridge arm unit. The common feature of this group of filter bridge arm topologies is that they all consist of a power transmission unit, a filter bridge arm unit, and four terminals. Input terminals 1 and 2 are connected to the low-voltage side input port. U L , output terminal 1 and output terminal 2 are connected to the high voltage side output port U H The different features are that the structures of the power transmission unit and the filter bridge arm unit are different. The specific filter bridge arm topologies of types I to IX are as follows:

[0062] Type I filter bridge arm topology structure is as follows Figure 6 As shown, it consists of a type 1 power transmission unit, a type 1 filter bridge arm unit, and four terminals, wherein: the type 1 power transmission unit consists of a switch device S1, a switch device S2, an energy storage bridge arm, and an inductor L3; the type 1 filter bridge arm unit consists of a filter bridge arm 1, a filter bridge arm 2, an inductor L1, and an inductor L2. Input terminal 1 is connected to one end of inductor L1, inductor L2, and switch device S1, respectively. The other ends of inductor L1 and inductor L2 are connected to one end of filter bridge arm 1 and filter bridge arm 2, respectively. The other end of filter bridge arm 1 is connected to input terminal 2, the other end of filter bridge arm 2 is connected to one end of switch device S2 and output terminal 1, and the other end of switch device S2 is connected to one end of inductor L3 and the other end of switch device S1, respectively. The other end of inductor L3 is connected to one end of the energy storage bridge arm, and the other end of the energy storage bridge arm is connected to the other end of filter bridge arm 1 and output terminal 2, respectively. Input terminal 1 and input terminal 2 are connected to the low-voltage side input port U L , output terminal 1 and output terminal 2 are connected to the high voltage side output port U H .

[0063] Type II topology Figure 7As shown, it consists of a Type 1 power transmission unit, a Type 2 filter bridge arm unit, and four terminals. The Type 1 power transmission unit consists of a switch device S1, a switch device S2, an energy storage bridge arm, and an inductor L3; the Type 2 filter bridge arm unit consists of a filter bridge arm 1, a filter bridge arm 2, an inductor L1, and an inductor L2. Input terminal 1 is connected to one end of inductor L1 and one end of switch device S1, respectively. The other end of inductor L1 is connected to one end of filter bridge arm 1. The other end of filter bridge arm 1 is connected to one end of switch device S2, one end of inductor L2, and output terminal 1. The other end of inductor L2 is connected to one end of filter bridge arm 2, and the other end of filter bridge arm 2 is connected to output terminal 2. The other end of switch device S2 is connected to one end of inductor L3 and the other end of switch device S1. The other end of inductor L3 is connected to one end of the energy storage bridge arm, and the other end of the energy storage bridge arm is connected to the other end of filter bridge arm 2 and input terminal 2. Input terminal 1 and input terminal 2 are connected to the low-voltage side input port. U L , output terminal 1 and output terminal 2 are connected to the high voltage side output port U H .

[0064] Type III topology Figure 8 As shown, it consists of a Type 1 power transmission unit, a Type 3 filter bridge arm unit, and four terminals. The Type 1 power transmission unit consists of a switch device S1, a switch device S2, an energy storage bridge arm, and an inductor L3; the Type 3 filter bridge arm unit consists of a filter bridge arm 1, a filter bridge arm 2, an inductor L1, and an inductor L2. Input terminal 1 is connected to one end of inductor L1 and switch device S1, respectively. The other end of inductor L1 is connected to one end of filter bridge arm 1, which in turn is connected to input terminal 2. The other end of switch device S1 is connected to one end of inductor L3 and switch device S2. The other end of inductor L3 is connected to the energy storage bridge arm, which in turn is connected to the other end of filter bridge arm 1. The other end of switch device S2 is connected to one end of inductor L2 and output terminal 1. The other end of inductor L2 is connected to one end of filter bridge arm 2, which in turn is connected to the other end of the energy storage bridge arm and output terminal 2. Input terminals 1 and 2 are connected to the low-voltage input port. U L , output terminal 1 and output terminal 2 are connected to the high voltage side output port U H .

[0065] Type IV topology Figure 9As shown, it consists of a Type 2 power transmission unit, a Type 1 filter bridge arm unit, and four terminals. The Type 1 power transmission unit consists of a switch device S1, a switch device S2, an energy storage bridge arm, and an inductor L3; the Type 2 filter bridge arm unit consists of a filter bridge arm 1, a filter bridge arm 2, an inductor L1, and an inductor L2. Input terminal 1 is connected to one end of inductor L1, inductor L2, and the energy storage bridge arm, respectively. The other end of inductor L1 is connected to one end of filter bridge arm 1, the other end of inductor L2 is connected to one end of filter bridge arm 2, and the other end of the energy storage bridge arm is connected to one end of inductor L3. The other end of filter bridge arm 1 is connected to input terminal 2. The other end of inductor L3 is connected to one end of switch device S1 and switch device S2. The other end of switch device S1 is connected to the other end of filter bridge arm 1 and output terminal 2, and the other end of switch device S2 is connected to the other end of filter bridge arm 2 and output terminal 1. Input terminal 1 and input terminal 2 are connected to the low-voltage side input port. U L , output terminal 1 and output terminal 2 are connected to the high voltage side output port U H .

[0066] Type V topology Figure 10 As shown, it consists of a Type 2 power transmission unit, a Type 2 filter bridge arm unit, and four terminals. The Type 1 power transmission unit consists of a switch device S1, a switch device S2, an energy storage bridge arm, and an inductor L3; the Type 2 filter bridge arm unit consists of a filter bridge arm 1, a filter bridge arm 2, an inductor L1, and an inductor L2. Input terminal 1 is connected to one end of inductor L1 and one end of the energy storage bridge arm; the other end of inductor L1 is connected to one end of filter bridge arm 1; and the other end of the energy storage bridge arm is connected to one end of inductor L3. The other end of inductor L3 is connected to one end of switch device S1 and one end of switch device S2. The other end of switch device S2 is connected to the other end of filter bridge arm 1 and one end of inductor L2; the other end of inductor L2 is connected to one end of filter bridge arm 2; the other end of switch device S1 is connected to the other end of filter bridge arm 2 and input terminal 2. Output terminal 1 is connected to one end of inductor L2, and output terminal 2 is connected to the other end of filter bridge arm 2. Input terminal 1 and input terminal 2 are connected to the low-voltage side input port U L , output terminal 1 and output terminal 2 are connected to the high voltage side output port U H .

[0067] Type VI topology Figure 11As shown, it consists of a Type 2 power transmission unit, a Type 3 filter bridge arm unit, and four terminals. The Type 1 power transmission unit consists of a switch device S1, a switch device S2, an energy storage bridge arm, and an inductor L3; the Type 2 filter bridge arm unit consists of a filter bridge arm 1, a filter bridge arm 2, an inductor L1, and an inductor L2. Input terminal 1 is connected to one end of inductor L1 and one end of the energy storage bridge arm. The other end of inductor L1 is connected to one end of filter bridge arm 1. The other end of the energy storage bridge arm is connected to one end of inductor L3. The other end of inductor L3 is connected to one end of switch device S1 and one end of switch device S2. The other end of filter bridge arm 1 is connected to input terminal 2 and the other end of switch device S1. One end of inductor L2 is connected to the other end of switch device S2 and output terminal 1. The other end of inductor L2 is connected to one end of filter bridge arm 2. The other end of filter bridge arm 2 is connected to the other end of switch device S1 and output terminal 2. Input terminal 1 and input terminal 2 are connected to the low-voltage side input port. U L , output terminal 1 and output terminal 2 are connected to the high voltage side output port U H .

[0068] Type VII topology Figure 12 As shown, it consists of a Type 3 power transmission unit, a Type 1 filter bridge arm unit, and four terminals. The Type 1 power transmission unit consists of a switch device S1, a switch device S2, an energy storage bridge arm, and an inductor L3; the Type 2 filter bridge arm unit consists of a filter bridge arm 1, a filter bridge arm 2, an inductor L1, and an inductor L2. Input terminal 1 is connected to one end of inductor L1, inductor L2, and switch device S2, respectively. The other end of inductor L1 is connected to one end of filter bridge arm 1, the other end of inductor L2 is connected to one end of filter bridge arm 2, and the other end of switch device S2 is connected to one end of switch device S1 and one end of inductor L3. The other end of filter bridge arm 1 is connected to input terminal 2 and the other end of switch device S1, and output terminal 2 is connected to the other end of switch device S1. The other end of inductor L3 is connected to one end of the energy storage bridge arm, and the other end of the energy storage bridge arm is connected to the other end of filter bridge arm 2 and output terminal 1. Input terminal 1 and input terminal 2 are connected to the low-voltage side input port. U L , output terminal 1 and output terminal 2 are connected to the high voltage side output port U H .

[0069] Type VIII topology Figure 13As shown, it consists of a Type 3 power transmission unit, a Type 2 filter bridge arm unit, and four terminals. The Type 1 power transmission unit consists of a switch device S1, a switch device S2, an energy storage bridge arm, and an inductor L3; the Type 2 filter bridge arm unit consists of a filter bridge arm 1, a filter bridge arm 2, an inductor L1, and an inductor L2. Input terminal 1 is connected to one end of inductor L1 and one end of switch device S2, respectively. The other end of inductor L1 is connected to one end of filter bridge arm 1, and the other end of switch device S2 is connected to one end of switch device S1 and one end of inductor L3. Input terminal 2 is connected to the other end of switch device S1. The other end of inductor L3 is connected to one end of the energy storage bridge arm, and the other end of the energy storage bridge arm is connected to the other end of filter bridge arm 1 and one end of inductor L2. Output terminal 1 is connected to one end of inductor L2, the other end of inductor L2 is connected to one end of filter bridge arm 2, and the other end of filter bridge arm 2 is connected to the other end of switch device S1 and output terminal 2. Input terminal 1 and input terminal 2 are connected to the low-voltage side input port U L , output terminal 1 and output terminal 2 are connected to the high voltage side output port U H .

[0070] Type IX topology such as Figure 14 As shown, it consists of three types of power transmission units, three types of filter bridge arm units, and four terminals. The type 1 power transmission unit consists of a switch device S1, a switch device S2, an energy storage bridge arm, and an inductor L3; the type 2 filter bridge arm unit consists of a filter bridge arm 1, a filter bridge arm 2, an inductor L1, and an inductor L2. Input terminal 1 is connected to one end of inductor L1 and switch device S2, respectively. The other end of inductor L1 is connected to one end of filter bridge arm 1, and the other end of filter bridge arm 1 is connected to input terminal 2 and one end of switch device S1. The other end of switch device S1 is connected to the other end of switch device S2 and one end of inductor L3. The other end of L3 is connected to one end of the energy storage bridge arm. The other end of the energy storage bridge arm is connected to output terminal 1 and one end of inductor L2. The other end of inductor L2 is connected to one end of filter bridge arm 2. The other end of filter bridge arm 2 is connected to one end of switch device S1 and output terminal 2. Input terminal 1 and input terminal 2 are connected to the low-voltage side input port. U L , output terminal 1 and output terminal 2 are connected to the high voltage side output port U H .

Claims

1. A bidirectional high-voltage DC converter topology with a filter bridge arm, characterized in that The bidirectional high-voltage direct current converter topology is constructed by a power transmission unit and a filter bridge arm unit, wherein: The low-voltage side port of the power transmission unit U L In parallel with the input port of the filter bridge unit, the high-voltage side port of the power transmission unit U H connected in parallel with the output port of the filter bridge arm unit; The power transmission unit is composed of two switching devices S1 and S2, an energy storage bridge arm, an inductor L and four terminals. Terminal 1 is connected to one end of the switching device S1, the other end of the switching device S1 is connected to the inductor L and one end of the switching device S2, the other end of the inductor L is connected to one end of the energy storage bridge arm, the other end of the energy storage bridge arm is connected to terminals 2 and 4, the other end of the switching device S2 is connected to terminal 3, and terminals 1 and 2 are connected to the low-voltage side port U L , terminals 3 and 4 are connected to the high voltage side port U H , low pressure side port U L In parallel with the input port of the filter bridge unit, the high-voltage side port U H Connected in parallel with the output port of the filter bridge arm unit.

2. The bidirectional high-voltage DC converter topology with a filter bridge arm according to claim 1 is characterized in that The power transmission unit is used to alternately transfer energy between the high and low voltage sides through the cooperation of the energy storage bridge arm and the switch; the filter bridge arm unit is used to compensate for the discontinuous current generated by the power transmission unit on the high and low voltage sides, ensuring smooth and continuous transmission of the current on the high and low voltage sides.

3. The bidirectional high-voltage DC converter topology with a filter bridge arm according to claim 1 is characterized in that The filtering bridge arm and the energy storage bridge arm may both be formed by cascading full-bridge submodules, cascading half-bridge submodules, or a mixed cascade of full-bridge submodules and half-bridge submodules.

4. The bidirectional high-voltage DC converter topology with a filter bridge arm according to claim 1 is characterized in that The switch devices S1 and S2 are composed of two half-controlled thyristor devices connected in series and in anti-parallel.

5. A bidirectional high-voltage DC converter topology with a filter bridge arm, characterized in that The bidirectional high-voltage direct current converter topology is constructed by a power transmission unit and a filter bridge arm unit, wherein: The low-voltage side port of the power transmission unit U L In parallel with the input port of the filter bridge unit, the high-voltage side port of the power transmission unit U H connected in parallel with the output port of the filter bridge arm unit; The power transmission unit is composed of two switching devices S1 and S2, an energy storage bridge arm, an inductor L and four terminals. Terminal 1 is connected to one end of the switching device S2, the other end of the switching device S2 is connected to the inductor L and one end of the switching device S1, the other end of the inductor L is connected to one end of the energy storage bridge arm, the other end of the energy storage bridge arm is connected to terminal 3, the other end of the switching device S1 is connected to terminals 2 and 4, and terminals 1 and 2 are connected to the low-voltage side port U L , terminals 3 and 4 are connected to the high voltage side port U H , low pressure side port U L In parallel with the input port of the filter bridge unit, the high-voltage side port U H Connected in parallel with the output port of the filter bridge arm unit.

6. A bidirectional high-voltage DC converter topology with a filter bridge arm, characterized in that The bidirectional high-voltage direct current converter topology is constructed by a power transmission unit and a filter bridge arm unit, wherein: The low-voltage side port of the power transmission unit U L In parallel with the input port of the filter bridge unit, the high-voltage side port of the power transmission unit U H connected in parallel with the output port of the filter bridge arm unit; The power transmission unit is composed of two switching devices S1 and S2, an energy storage bridge arm, an inductor L and four terminals. Terminal 3 is connected to one end of the switching device S1, the other end of the switching device S1 is connected to the inductor L and one end of the switching device S2, the other end of the switching device S2 is connected to terminals 2 and 4, the other end of the inductor L is connected to one end of the energy storage bridge arm, the other end of the energy storage bridge arm is connected to terminal 1, and terminals 1 and 2 are connected to the low-voltage side port U L , terminals 3 and 4 are connected to the high voltage side port U H , low pressure side port U L In parallel with the input port of the filter bridge unit, the high-voltage side port U H Connected in parallel with the output port of the filter bridge arm unit.

7. A bidirectional high-voltage DC converter topology with a filter bridge arm, characterized in that The bidirectional high-voltage direct current converter topology is constructed by a power transmission unit and a filter bridge arm unit, wherein: The low-voltage side port of the power transmission unit U L In parallel with the input port of the filter bridge unit, the high-voltage side port of the power transmission unit U H connected in parallel with the output port of the filter bridge arm unit; The filter bridge arm unit is composed of two filter bridge arms, two inductors L1 and L2 and four terminals. The input terminal 1 is connected to one end of the inductors L1 and L2, and the other ends of the inductors L1 and L2 are respectively connected to one end of the filter bridge arm 1 and the filter bridge arm 2. The other end of the filter bridge arm 1 is connected to the input terminal 2 and the output terminal 2. The other end of the filter bridge arm 2 is connected to the output terminal 1. The input terminal 1 and the input terminal 2 are connected to the input port, and the output terminal 1 and the output terminal 2 are connected to the output port.

8. A bidirectional high-voltage DC converter topology with a filter bridge arm, characterized in that The bidirectional high-voltage direct current converter topology is constructed by a power transmission unit and a filter bridge arm unit, wherein: The low-voltage side port of the power transmission unit U L In parallel with the input port of the filter bridge unit, the high-voltage side port of the power transmission unit U H connected in parallel with the output port of the filter bridge arm unit; The filter bridge arm unit consists of two filter bridge arms, two inductors L1 and L2, and four terminals. The input terminal 1 is connected to one end of the inductor L1, the other end of the inductor L1 is connected to one end of the filter bridge arm 1, the other end of the filter bridge arm 1 is connected to one end of the inductor L2 and the output terminal 1, the other end of the inductor L2 is connected to one end of the filter bridge arm 2, the other end of the filter bridge arm 2 is connected to the input terminal 2 and the output terminal 2, the input terminal 1 and the input terminal 2 are connected to the input port, and the output terminal 1 and the output terminal 2 are connected to the output port.

9. A bidirectional high-voltage DC converter topology with a filter bridge arm, characterized in that The bidirectional high-voltage direct current converter topology is constructed by a power transmission unit and a filter bridge arm unit, wherein: The low-voltage side port of the power transmission unit U L In parallel with the input port of the filter bridge unit, the high-voltage side port of the power transmission unit U H connected in parallel with the output port of the filter bridge arm unit; The filter bridge arm unit is composed of two filter bridge arms, two inductors L1 and L2, and four terminals. The input terminal 1 is connected to one end of the inductor L1, the other end of the inductor L1 is connected to one end of the filter bridge arm 1, the output terminal 1 is connected to one end of the inductor L2, the other end of the inductor L2 is connected to one end of the filter bridge arm 2, the other end of the filter bridge arm 1 is connected to the input terminal 2, and the other end of the filter bridge arm 2 is connected to the output terminal 2. The input terminal 1 and the input terminal 2 are connected to the input port, and the output terminal 1 and the output terminal 2 are connected to the output port.

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