Hybrid disturbance power grid simulation device

Abstract

The utility model provides a hybrid disturbance power grid simulation device. The hybrid disturbance power grid simulation device comprises a rectifier, an inverter, a filter inductor, a fling-cut switch, a filter capacitor and an access point, the alternating current end of the rectifier is used for being connected with an alternating current power supply, the direct current end of the rectifier is connected with the direct current end of the inverter, the alternating current end of the inverter is connected with one end of the filter inductor, and the other end of the filter inductor is connected with one end of the fling-cut switch and the access point. The other end of the fling-cut switch is connected with the filter capacitor; and the access point is used for accessing a tested device or a motor. The hybrid disturbance power grid simulation device not only can be used for generating disturbance voltage, but also can be used for dragging a motor, and the function of an original three-phase power grid disturbance generation device is expanded.

Description

Technical Field

[0001] This application relates to the field of power grid technology, and in particular to a hybrid disturbance power grid simulation device. Background Technology

[0002] As the proportion of new energy power generation in the power system continues to increase, three-phase grid disturbance generators used for grid adaptability testing have received more attention and development in order to meet the requirements for safe and stable operation of the power system. Common three-phase grid disturbance generators and motor drive devices have similar topologies and characteristics, and both have the ability to operate in four quadrants, which provides a foundation for the integration of grid adaptability testing functions and motor drive functions. Utility Model Content

[0003] This application provides a hybrid disturbance power grid simulation device that can be used to generate disturbance voltage and drive motors, thus expanding the functionality of the original three-phase power grid disturbance generator.

[0004] This application provides a hybrid disturbance power grid simulation device, including a rectifier, an inverter, a filter inductor, a switching switch, a filter capacitor, and a connection point;

[0005] The AC terminal of the rectifier is used to connect to the AC power supply, the DC terminal of the rectifier is connected to the DC terminal of the inverter, the AC terminal of the inverter is connected to one end of the filter inductor, the other end of the filter inductor is connected to one end of the switching switch and the access point, and the other end of the switching switch is connected to the filter capacitor.

[0006] The access point is used to connect to the device under test or the motor.

[0007] In one example, the rectifier or the inverter includes a two-level converter or a multi-level converter.

[0008] In one example, the rectifier includes a three-phase rectifier; and / or, the inverter includes a three-phase inverter or a single-phase inverter with three common DC buses.

[0009] In one example, the power devices in the rectifier or inverter include insulated-gate bipolar transistors or integrated gate-commutated thyristors.

[0010] In one example, the hybrid disturbance power grid simulation device further includes an input switch connected between the AC power source and the AC terminal of the rectifier.

[0011] In one example, the hybrid disturbance power grid simulation device further includes an input filter connected between the AC power source and the AC terminal of the rectifier.

[0012] In one example, the filter inductor is formed by the secondary winding of a transformer; or, the filter inductor is formed by a separate inductor; or, the filter inductor is formed by the secondary winding of a transformer and a separate inductor together.

[0013] In one example, the hybrid disturbance power grid simulation device further includes a damping resistor connected between the other end of the switching switch and the filter capacitor.

[0014] In one example, the filter capacitor includes one or more sets of delta-connected power capacitors.

[0015] In one example, the hybrid disturbance power grid simulation device further includes a controller for controlling the switching on or off of the switching device.

[0016] The hybrid disturbance grid simulation device provided above can be used to generate disturbance voltage and drive motors, thus expanding the functionality of the original three-phase grid disturbance generator. Attached Figure Description

[0017] Figure 1 A schematic diagram of a hybrid disturbance power grid simulation device provided in an embodiment of this application;

[0018] Figure 2 A schematic diagram illustrating a specific example of a hybrid disturbance power grid simulation device provided in this application embodiment;

[0019] Figure 3 This is a schematic diagram of another specific example of a hybrid disturbance power grid simulation device provided in the embodiments of this application.

[0020] The realization of the purpose, functional features and advantages of this application will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0021] To make the technical problems, technical solutions, and beneficial effects to be solved by this application clearer and more understandable, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of this application and are not intended to limit the scope of this application.

[0022] In the description of this application, it should be understood that the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0023] like Figure 1 As shown, this application provides a hybrid disturbance power grid simulation device, including a rectifier Q1, an inverter Q2, a filter inductor L1, a switching switch K2, a filter capacitor C1, and an access point A;

[0024] The AC terminal of rectifier Q1 is used to connect to the AC power supply. The DC terminal of rectifier Q1 is connected to the DC terminal of inverter Q2. The AC terminal of inverter Q2 is connected to one end of filter inductor L1. The other end of filter inductor L1 is connected to one end of switching switch K2 and access point A. The other end of switching switch K2 is connected to filter capacitor C1.

[0025] Access point A is used to connect to the device under test or the motor.

[0026] In one example, rectifier Q1 or inverter Q2 includes a two-level converter or a multi-level converter. The AC power supply is rectified by rectifier Q1 to provide a stable DC voltage as the input of inverter Q2. The DC power is then inverted by inverter Q2 into AC power with adjustable amplitude, frequency, and phase.

[0027] In one example, the power devices in rectifier Q1 or inverter Q2 include insulated gate bipolar transistors (IGBTs) or integrated gate commutated thyristors (IGCTs).

[0028] In one example, rectifier Q1 includes a three-phase rectifier; and / or, inverter Q2 includes a three-phase inverter or a single-phase inverter with three common DC buses.

[0029] In one example, the hybrid disturbance power grid simulation device also includes an input switch K1, which is connected between the AC power supply and the AC terminal of the rectifier Q1.

[0030] In one example, the hybrid disturbance power grid simulation device further includes an input filter T1 connected between the AC power supply and the AC terminal of the rectifier Q1.

[0031] In one example, the filter inductor L1 is formed by the secondary winding of the transformer; or, the filter inductor L1 is formed by a separate inductor; or, the filter inductor L1 is formed by the secondary winding of the transformer and a separate inductor together.

[0032] In one example, the hybrid disturbance power grid simulation device further includes a damping resistor R1, which is connected between the other end of the switching switch K2 and the filter capacitor C1.

[0033] In one example, the filter capacitor C1 comprises one or more sets of delta-connected power capacitors, i.e., the capacitors are connected one at a time in sequence.

[0034] In one example, the hybrid disturbance power grid simulation device also includes a controller (not shown) for controlling the switching on or off of the switching switch K2.

[0035] The working principle of the hybrid disturbance power grid simulation device is as follows:

[0036] When the device under test is connected to the access point A, the controller controls the switching switch K2 to close, connecting the damping resistor R1 and the filter capacitor C1. At the same time, the hybrid disturbance grid simulation device operates in power supply mode, and the inverter Q2 controls the output voltage, which includes the fundamental voltage and harmonic voltage.

[0037] When the motor is connected to the access point A, the controller controls the switching switch K2 to open, cutting off the damping resistor R1 and the filter capacitor C1. At the same time, the hybrid disturbance grid simulation device operates in drive mode, and the inverter Q2 adopts torque control for driving the motor.

[0038] In this way, by controlling the switching switch and changing the control mode, it can be used to generate disturbance voltage as well as drive the motor, thus expanding the function of the original three-phase power grid disturbance generator.

[0039] Figure 2 This is a schematic diagram illustrating a specific example of a hybrid disturbance power grid simulation device provided in an embodiment of this application.

[0040] exist Figure 2 In the middle, a transformer T10 is connected between the AC terminal of rectifier Q10 and the AC power supply.

[0041] exist Figure 2 In the diagram, rectifier Q10 is a three-phase rectifier, inverter Q20 is a three-phase inverter, and a DC bus capacitor is also provided between rectifier Q10 and inverter Q20, which is connected between the positive and negative DC buses.

[0042] exist Figure 2 In this configuration, the AC terminal of inverter Q20 is connected to the primary side of transformer L10, and the secondary side of transformer L10 is connected to the access point, thereby connecting the device under test or the motor. The impedance of transformer L10 acts as a filter inductor.

[0043] exist Figure 2 In the diagram, the switching switch K20, damping resistor R10, and filter capacitor C10 can be referenced. Figure 1 Example description.

[0044] and Figure 1 Similarly, the working principle of the hybrid disturbance power grid simulation device is as follows:

[0045] When the device under test is connected to the access point, the controller controls the switching switch K20 to close, connecting the damping resistor R10 and the filter capacitor C10. At the same time, the hybrid disturbance grid simulation device operates in power supply mode, and the inverter Q20 outputs disturbance voltage.

[0046] When a motor is connected to the access point, the controller controls the switching switch K20 to open, disconnecting the damping resistor R10 and the filter capacitor C10. At the same time, the hybrid disturbance grid simulation device switches to drive mode, and the inverter Q20 uses torque control for driving the motor.

[0047] Figure 3 This is a schematic diagram of another specific example of a hybrid disturbance power grid simulation device provided in the embodiments of this application.

[0048] exist Figure 3 In the middle, a transformer T11 is connected between the AC terminal of rectifier Q11 and the AC power supply.

[0049] exist Figure 3 In the diagram, rectifier Q11 is a three-phase rectifier, and inverters Q21, Q22, and Q23 are three single-phase inverters sharing a common DC bus. A DC bus capacitor is also provided between rectifier Q11 and the inverters, and the DC bus capacitor is connected between the positive and negative DC buses.

[0050] exist Figure 3 In this configuration, the AC terminal of inverter Q21 is connected to the primary winding of transformer L11, and the secondary winding of transformer L11 is connected to the connection point. The AC terminal of inverter Q22 is connected to the primary winding of transformer L12, and the secondary winding of transformer L12 is connected to the connection point. The AC terminal of inverter Q23 is connected to the primary winding of transformer L13, and the secondary winding of transformer L13 is connected to the connection point, thus connecting the device under test or the motor. The impedance of transformers L11-L13 acts as a filter inductor.

[0051] exist Figure 3 In the diagram, the switching switch K21, damping resistor R11, and filter capacitor C11 can be referenced. Figure 1 Example description.

[0052] and Figure 1 Similarly, the working principle of the hybrid disturbance power grid simulation device is as follows:

[0053] When the device under test is connected to the access point, the controller controls the switching switch K21 to close, connecting the damping resistor R11 and the filter capacitor C11. At the same time, the hybrid disturbance grid simulation device operates in power supply mode, and the inverters Q21-Q23 output disturbance voltage.

[0054] When a motor is connected to the access point, the controller controls the switching switch K21 to open, disconnecting the damping resistor R11 and the filter capacitor C11. At the same time, the hybrid disturbance grid simulation device switches to drive mode, and the inverters Q21-Q23 use torque control for driving the motor.

[0055] The preferred embodiments of this application have been described above with reference to the accompanying drawings, but this does not limit the scope of the claims. Any modifications, equivalent substitutions, and improvements made by those skilled in the art without departing from the scope and spirit of this application shall be within the scope of the claims.

Claims

1. A hybrid disturbance power grid simulation device, characterized in that, This includes rectifiers, inverters, filter inductors, switching devices, filter capacitors, and connection points; The AC terminal of the rectifier is used to connect to the AC power supply, the DC terminal of the rectifier is connected to the DC terminal of the inverter, the AC terminal of the inverter is connected to one end of the filter inductor, the other end of the filter inductor is connected to one end of the switching switch and the access point, and the other end of the switching switch is connected to the filter capacitor. The access point is used to connect to the device under test or the motor.

2. The hybrid disturbance power grid simulation device according to claim 1, characterized in that, The rectifier or the inverter includes a two-level converter or a multi-level converter.

3. The hybrid disturbance power grid simulation device according to claim 1, characterized in that, The rectifier includes a three-phase rectifier; and / or, the inverter includes a three-phase inverter or a single-phase inverter with three common DC buses.

4. The hybrid disturbance power grid simulation device according to claim 1, characterized in that, The power devices in the rectifier or the inverter include insulated-gate bipolar transistors or integrated gate commutated thyristors.

5. The hybrid disturbance power grid simulation device according to claim 1, characterized in that, The hybrid disturbance power grid simulation device also includes an input switch connected between the AC power supply and the AC terminal of the rectifier.

6. The hybrid disturbance power grid simulation device according to claim 1, characterized in that, The hybrid disturbance power grid simulation device also includes an input filter connected between the AC power supply and the AC terminal of the rectifier.

7. The hybrid disturbance power grid simulation device according to claim 1, characterized in that, The filter inductor is formed by the secondary winding of the transformer; or, the filter inductor is formed by an independent inductor; or, the filter inductor is formed by the secondary winding of the transformer and an independent inductor together.

8. The hybrid disturbance power grid simulation device according to claim 1, characterized in that, The hybrid disturbance power grid simulation device also includes a damping resistor, which is connected between the other end of the switching switch and the filter capacitor.

9. The hybrid disturbance power grid simulation device according to claim 1, characterized in that, The filter capacitor includes one or more sets of power capacitors connected in a delta configuration.

10. The hybrid disturbance power grid simulation device according to claim 1, characterized in that, The hybrid disturbance power grid simulation device also includes a controller for controlling the switching on or off of the switching device.

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