AC / DC power supply integrated simulation device

Abstract

The utility model discloses an AC / DC power supply integrated simulation device comprising a three-phase multi-winding transformer and a power converter which are connected together, and the power converter is connected with the input end of a change-over switch. The output end of the change-over switch is communicated with the input end of the alternating-current output filter or the direct-current output filter through a change-over contact, a primary winding of the three-phase multi-winding transformer is connected with a three-phase power grid, and the output end of the alternating-current output filter or the output end of the direct-current output filter are respectively connected with corresponding tested units; the alternating current and direct current power supply integrated simulation device can simulate alternating current power supply output or direct current power supply output in the same simulation device, the occupied area of the device is small, the operation is convenient, and the cost is saved.

Description

Technical Field

[0001] The utility model relates to the technical field of high voltage test and experiment, in particular to an AC / DC power supply integrated simulation device. Background Art

[0002] With the rapid development of new energy, a large number of distributed new energy power generation systems have been built, and the power generation equipment connected to the power grid will cause many adverse effects on the power grid, mainly including the following: voltage deviation, large power fluctuations, frequency problems, excessive harmonic content and other power quality problems. In order to ensure the safe operation of the large power grid, the new energy power generation equipment needs to be tested for grid adaptability before being connected to the grid. However, the failures of the large power grid are random and cannot be intervened by humans. Therefore, the power grid simulator, as a key device for power grid adaptability testing, can simulate and output various fault states of the power grid, and its existence is of great value.

[0003] At present, with the development of new energy power generation systems, DC power grids are gradually emerging, and more and more equipment have the demand for DC power grid testing. The current measure is to equip a set of AC source simulation devices and a set of DC source simulation devices, which are costly, large in size, and extremely inconvenient. Utility Model Content

[0004] The technical problem to be solved by the utility model is to provide an AC / DC power supply integrated simulation device, which can simulate AC power supply output or DC power supply output in the same set of simulation devices, has a small equipment footprint, is easy to operate, and saves costs.

[0005] In order to solve the above technical problems, the utility model provides an integrated AC / DC power supply simulation device, comprising a three-phase multi-winding transformer and a power converter connected in sequence, wherein the power converter is connected to the input end of a conversion switch; the conversion switch connects its output end to the input end of an AC output filter or a DC output filter through a conversion contact, the primary winding of the three-phase multi-winding transformer is connected to a three-phase power grid, and the output end of the AC output filter or the DC output filter is respectively connected to the corresponding unit under test;

[0006] The power converter includes three groups of power module groups corresponding to one-phase output respectively, each group of power module groups includes n power modules, and each of the power modules includes a rectifier unit, a DC bus unit and a single-phase H-bridge inverter unit connected in sequence; the input end of the rectifier unit is connected to the secondary winding of the three-phase multi-winding transformer, and the DC bus unit includes a DC capacitor group; the output ends of all single-phase H-bridge inverters of each group of the power module groups are cascaded to form a cascade output end corresponding to one phase; wherein n≥2.

[0007] Preferably, when the AC power supply simulates output, the three-phase cascade output end of the power converter is connected to the input end line of the AC output filter through the conversion switch, and the output end of the AC output filter serves as the AC output end of the AC / DC power supply integrated simulation device.

[0008] Preferably, when the DC power supply simulates output, two of the phase cascade output ends of the power converter are connected to the input end line of the DC output filter through the conversion switch, the other phase cascade output end of the power converter is suspended, and the output end of the DC output filter serves as the DC output end of the AC / DC integrated power supply simulation device.

[0009] Preferably, when the DC power supply is simulating output, the power module groups of the corresponding two phases of the power converter operate in a DC source mode, and the power module group of the other phase is blocked.

[0010] Preferably, the DC output filter includes a DC reactor and a DC capacitor.

[0011] Preferably, the AC output filter includes a three-phase AC reactor and a three-phase filter capacitor.

[0012] After adopting the above device, the AC / DC power supply integrated simulation device includes a three-phase multi-winding transformer and a power converter connected together, the power converter is connected to the input end of the conversion switch; the conversion switch makes its output end connected to the input end of the AC output filter or the DC output filter through the conversion contact, the primary winding of the three-phase multi-winding transformer is connected to the three-phase power grid, and the output end of the AC output filter or the DC output filter is respectively connected to the corresponding measured unit; the power converter includes three groups of power module groups corresponding to one phase output respectively, each group of power module groups includes n power modules, and each of the power modules includes a rectifier unit, a DC bus unit and a single-phase H-bridge inverter unit connected in sequence; the input end of the rectifier unit is connected to the secondary winding of the three-phase multi-winding transformer, and the DC bus unit includes a DC capacitor group; the output ends of all single-phase H-bridge inverters of each group of the power module groups are cascaded to form a cascade output end corresponding to one phase; the AC / DC power supply integrated simulation device can simulate AC power output or DC power output in the same set of simulation devices, and the equipment occupies a small area, is easy to operate, and saves costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is the overall topology diagram of the AC / DC power supply integrated simulation device of the utility model;

[0014] Figure 2 A circuit diagram of a group of power modules of a power converter of the AC / DC power supply integrated simulation device of the utility model;

[0015] Figure 3 It is a connection diagram of the power converter and the AC output filter when the AC / DC power supply integrated simulation device of the utility model works in the AC power supply simulation output;

[0016] Figure 4 The utility model is a connection diagram of a power converter and a DC output filter when the AC / DC power supply integrated simulation device works in a DC power supply simulation output.

[0017] The realization of the purpose, functional features and advantages of this application will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0018] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present application clearer and more understandable, the present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0019] In the description of the present application, it should be understood that the orientations or positional relationships indicated by the terms "center", "upper", "lower", "front", "back", "left", "right", etc. are based on the orientations or positional relationships shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present application. In addition, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance.

[0020] Embodiment 1

[0021] See also Figure 1 and Figure 2 , Figure 1 This is the overall topology diagram of the AC / DC power supply integrated simulation device of the utility model. Figure 2 A circuit diagram of a group of power modules of a power converter of the AC / DC power supply integrated simulation device of the utility model;

[0022] The present embodiment discloses an integrated AC / DC power supply simulation device, comprising a three-phase multi-winding transformer 10 and a power converter 11 connected together, wherein the power converter 11 is connected to the input end of a conversion switch 12; the conversion switch 12 connects its output end to the input end of an AC output filter 13 or a DC output filter 14 through a conversion contact, the primary winding of the three-phase multi-winding transformer 10 is connected to a three-phase power grid, and the output end of the AC output filter 13 or the DC output filter 14 is respectively connected to the corresponding unit under test;

[0023] The power converter 11 includes three groups of power module groups corresponding to one-phase output respectively, each group of power module groups includes n power modules, each of the power modules includes a rectifier unit, a DC bus unit and a single-phase H-bridge inverter unit connected in sequence; the input end of the rectifier unit is connected to the secondary winding of the three-phase multi-winding transformer, and the DC bus unit includes a DC capacitor group; the output ends of all single-phase H-bridge inverters of each group of the power module groups are cascaded to form a cascade output end corresponding to one phase; wherein n≥2.

[0024] Embodiment 2

[0025] See also Figure 3 , Figure 3 It is a connection diagram of the power converter and the AC output filter when the AC / DC power supply integrated simulation device of the utility model works in the AC power supply simulation output;

[0026] This embodiment is based on the first embodiment. In this embodiment, when the AC power supply simulates output, the three-phase cascade output end of the power converter 11 is connected to the input end line of the AC output filter 13 through the conversion switch 12, and the output end of the AC output filter 13 serves as the AC output end of the AC / DC power supply integrated simulation device.

[0027] In this embodiment, the AC output filter 13 includes a three-phase AC reactor and a three-phase filter capacitor.

[0028] Embodiment 3

[0029] See also Figure 4 , Figure 4 It is a connection diagram of a power converter and a DC output filter when the AC / DC power supply integrated simulation device of the utility model works in a DC power supply simulation output;

[0030] When the DC power supply simulates output, two phase cascade output ends of the power converter 11 are connected to the input end line of the DC output filter 14 through the conversion switch 12, and the other phase cascade output end of the power converter 11 is suspended, and the output end of the DC output filter 14 serves as the DC output end of the AC / DC power supply integrated simulation device.

[0031] When the DC power supply is in analog output, the corresponding two-phase power module group of the power converter 11 operates in the DC source mode, and the other phase power module group is blocked.

[0032] In this embodiment, the DC output filter 14 includes a DC reactor and a DC capacitor.

[0033] The integrated AC / DC power supply simulation device can simulate AC power output or DC power output in the same set of simulation devices, and the device occupies a small area, is easy to operate, and saves costs.

[0034] The preferred embodiments of the present application are described above with reference to the accompanying drawings, but the scope of the present application is not limited thereby. Any modification, equivalent substitution and improvement made by a person skilled in the art without departing from the scope and essence of the present application shall be within the scope of the present application.

Claims

1. An integrated AC / DC power supply simulation device, characterized in that: It includes a three-phase multi-winding transformer and a power converter connected together, the power converter is connected to the input end of a conversion switch; the conversion switch makes its output end connected to the input end of an AC output filter or a DC output filter through a conversion contact, the primary winding of the three-phase multi-winding transformer is connected to a three-phase power grid, and the output ends of the AC output filter or the DC output filter are respectively connected to corresponding units under test; The power converter includes three groups of power module groups corresponding to one-phase output respectively, each group of power module groups includes n power modules, and each of the power modules includes a rectifier unit, a DC bus unit and a single-phase H-bridge inverter unit connected in sequence; the input end of the rectifier unit is connected to the secondary winding of the three-phase multi-winding transformer, and the DC bus unit includes a DC capacitor group; the output ends of all single-phase H-bridge inverters of each group of the power module groups are cascaded to form a cascade output end corresponding to one phase; wherein n≥2.

2. The AC / DC power integrated simulation device according to claim 1, characterized in that: When the AC power supply simulates output, the three-phase cascade output end of the power converter is connected to the input end line of the AC output filter through the conversion switch, and the output end of the AC output filter serves as the AC output end of the AC / DC power supply integrated simulation device.

3. The AC / DC power integrated simulation device according to claim 1, characterized in that: When the DC power supply simulates output, two of the phase cascade output ends of the power converter are connected to the input end line of the DC output filter through the conversion switch, the other phase cascade output end of the power converter is suspended, and the output end of the DC output filter serves as the DC output end of the AC / DC power supply integrated simulation device.

4. The AC / DC power integrated simulation device according to claim 3, characterized in that: When the DC power supply is in analog output, the power module groups of the corresponding two phases of the power converter operate in a DC source mode, and the power module group of the other phase is blocked.

5. The AC / DC power integrated simulation device according to claim 1, characterized in that: The DC output filter includes a DC reactor and a DC capacitor.

6. The AC / DC power integrated simulation device according to claim 1, characterized in that: The AC output filter includes a three-phase AC reactor and a three-phase filter capacitor.

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