Power control module and power system

Abstract

Embodiments herein provide a power control module and a power system. The power control module (100) includes an alternating current (AC) chopper (90) for one of a plurality of phases of an AC power supply (200). The power control module (100) further comprises a first chopper resistor (80) connected in series to the first terminal (90a) of the AC chopper (90) and connectable to the first terminal (200a) of the AC power source (200). The first chopper resistor (80) is configured to be cooled by a liquid.

Description

Technical Field

[0001] This disclosure generally relates to power systems. More specifically, the present invention relates to a power control module with a liquid cooling device for use in power systems. Background Technology

[0002] Power systems (e.g., high-voltage direct current (HVDC) systems) provide the flexibility, controllability, and resilience required for the large-scale integration of renewable energy and the transmission of power from offshore to onshore stations.

[0003] In power systems, alternating current (AC) choppers (e.g., with wind power feeds) are used to prevent power transmission from tripping due to receiver failures. In the prior art, AC choppers use resistors configured to be air-cooled (hereinafter referred to as air-cooled resistors) to absorb active power during any fault in the power system.

[0004] In particular, in offshore power systems, AC choppers with air-cooled resistors are typically located on the DC side of onshore stations, but in some cases, it is advantageous to implement AC choppers at offshore stations. However, due to the large physical size of the air-cooled resistors in AC choppers, the placement of AC choppers at offshore stations can cause space (volume) issues.

[0005] Furthermore, offshore power systems (e.g., large wind farm systems) may require high power levels because voltage tends to increase, resulting in longer insulation distances. Consequently, as the voltage increases, all air-insulated components connected to the voltage require more space, which is extremely expensive when installed at offshore stations. Additionally, the temperature of the air-cooled resistors in AC choppers can rise within seconds and reach, for example, 600-700 Kelvin (K).

[0006] Therefore, the required high power processing capacity and air cooling make AC choppers unsuitable for implementation at offshore stations.

[0007] Furthermore, in offshore power systems, step-down transformers are typically connected between the thyristor valves of the AC chopper and the AC system. However, step-down transformers significantly increase the weight and size of the power system. Utility Model Content

[0008] Therefore, there is a need for an AC chopper arrangement with a reduced footprint / volume.

[0009] Therefore, the purpose of this disclosure is to provide a power control module including an improved AC chopper arrangement to mitigate, alleviate, or eliminate all or at least some of the aforementioned disadvantages of currently known solutions.

[0010] This and other objectives are achieved by the power control module as defined in the appended claims. The term "exemplary" is understood in this context to mean instance, example, or illustration.

[0011] According to a first aspect of this disclosure, a power control module is provided. The power control module includes an AC chopper for one phase of a multiphase AC power supply. The power control module also includes a first chopping resistor connected in series to a first terminal of the AC chopper and capable of being connected to a first terminal of the AC power supply. The first chopping resistor is configured to be liquid-cooled.

[0012] Advantageously, in the proposed power control module, the AC chopper can be directly connected to an AC power supply (typically 33, 66, or 138 kV). This eliminates the need for a step-down transformer to connect the AC chopper to the AC power supply, significantly reducing the AC chopper's footprint / volume. Furthermore, eliminating the need for a step-down transformer reduces reactive power consumption when the AC chopper is activated.

[0013] Furthermore, the proposed power control module provides a first chopper resistor configured to be liquid-cooled instead of (prior art) air-cooled. Liquid cooling makes the first chopper resistor physically smaller and reduces its temperature rise when absorbing high power across the AC power supply.

[0014] According to some embodiments, the power control module further includes a liquid cooling device configured to be connected to the first chopper resistor for liquid cooling of the first chopper resistor.

[0015] According to some embodiments, the liquid cooling device is a water cooling device that includes a water deionization unit.

[0016] According to some embodiments, a first chopper resistor is connected to a first measuring element. The first measuring element is configured to measure the current in the first chopper resistor, wherein the current is used to calculate the power loss of the first chopper resistor.

[0017] According to some embodiments, the first chopper resistor can be connected to a first terminal of the AC power supply via a second measuring element. The second measuring element is configured to measure the current in the AC power supply.

[0018] According to some embodiments, the power control module further includes a switching element configured to connect to the first chopper resistor and be connectable to a second measuring element. Advantageously, the switching element can be used to isolate the first chopper resistor and the AC chopper from the AC power supply.

[0019] According to some embodiments, the first chopper resistor includes a plurality of resistor units connected in series and / or in parallel.

[0020] According to some embodiments, the power control module further includes a second chopper resistor connected in series to a second terminal of the AC chopper and capable of being connected to a second terminal of an AC power supply. The second chopper resistor is configured to be liquid-cooled.

[0021] Therefore, in the proposed power control module, the AC chopper can be arranged between the first chopper resistor and the second chopper resistor, which divides the power loss of the AC chopper into the first and second resistors and protects the AC chopper from high fault current.

[0022] Furthermore, the liquid cooling of the second chopper resistor makes it physically smaller.

[0023] Therefore, due to the reduction in the physical size of the first and second chopper resistors, the power control module can be compact, thereby reducing the overall footprint / volume of the power system.

[0024] According to some embodiments, the power control module further includes a liquid cooling device configured to be connected to a second chopper resistor for liquid cooling of the second chopper resistor.

[0025] According to some embodiments, the liquid cooling device is a water cooling device that includes a water deionization module.

[0026] According to some embodiments, the AC chopper includes thyristor valves connected in series. According to some embodiments, the AC chopper includes switching devices connected in series. The switching devices include one or more of the following: insulated-gate bipolar transistors (IGBTs), integrated gate rectifier thyristors (IGCTs), and gate turn-off thyristors (GTOs).

[0027] According to some embodiments, a series combination of thyristor valves can be connected to an AC power supply via a first chopper resistor. Each thyristor valve includes multiple thyristors connected in series. Therefore, an AC chopper can include one or more branches of thyristor valves based on desired power absorption capabilities, which can reduce harmonic generation while reducing reactive power consumption.

[0028] According to some embodiments, the power control module includes a liquid cooling device configured to be connected to each thyristor valve for liquid cooling of the thyristor valve.

[0029] Advantageously, compared to existing air-cooling devices, the proposed liquid-cooling device for each of the first chopper resistor, the second chopper resistor, and each thyristor valve in an AC chopper requires significantly less space and reduces cooling time. Therefore, a highly efficient liquid-cooling device is provided for cooling the first chopper resistor, the second chopper resistor, and each thyristor valve in an AC chopper.

[0030] According to a second aspect of this disclosure, an electric power system is provided. The electric power system includes an alternating current (AC) power supply and at least one power control module according to the first aspect for at least one phase of the AC power supply. The at least one power control module is connected to a first terminal of the AC power supply via a first chopper resistor and to a second terminal of the AC power supply via an AC chopper.

[0031] According to some embodiments, at least one power control module includes a second chopper resistor and is connected to a second terminal of an AC power supply via the second chopper resistor.

[0032] According to some embodiments, the power system further includes an AC power supply comprising a first phase, a second phase, and a third phase. The power system also includes first, second, and third power control modules for the first, second, and third phases, respectively. Each of the first, second, and third power control modules is a power control module according to the first aspect.

[0033] According to some embodiments, the first, second, and third power control modules are configured to be arranged in a delta configuration. According to some embodiments, the first, second, and third power control modules are configured to be arranged in a Y-shaped configuration.

[0034] According to some embodiments, the AC power supply is a wind power device that is operatively coupled to the power grid at the point of coupling (PCC).

[0035] According to some embodiments, the power network is an offshore high-voltage direct current (HVDC) system.

[0036] Therefore, by arranging at least one proposed power control module, the footprint / volume and cost of the power system can be reduced.

[0037] In some embodiments, any of the foregoing aspects may additionally have the same or corresponding features as any of the various features explained above with respect to any other aspect.

[0038] Other advantages will likely be apparent to those skilled in the art. Certain embodiments may have some or all of the advantages listed. Attached Figure Description

[0039] The foregoing will become apparent from the following more detailed description of exemplary embodiments, as shown in the figures, where similar reference numerals refer to the same parts in different views. The figures are not necessarily drawn to scale, but rather to emphasize exemplary embodiments.

[0040] Figure 1 An example power system including a power control module with a first configuration, according to some embodiments, is disclosed;

[0041] Figure 2 An example power system including a power control module with a second configuration, according to some embodiments, is disclosed;

[0042] Figure 3 An example power system according to some embodiments is disclosed, which includes first and second power control modules for first and second phases of an alternating current (AC) power supply;

[0043] Figure 4A and Figure 4B An example power system according to some embodiments is disclosed, which includes first, second, and third power control modules for first, second, and third phases of an AC power supply; and

[0044] Figure 5A and Figure 5B A power control module according to some embodiments is disclosed. Detailed Implementation

[0045] The various aspects of this disclosure will now be described more fully with reference to the accompanying drawings. However, the power systems and power control modules disclosed herein can be implemented in many different forms and should not be construed as being limited to the aspects set forth herein. The same reference numerals throughout the drawings refer to the same elements.

[0046] The terminology used herein is for the purpose of describing specific aspects of this disclosure only and is not intended to limit the invention. It should be emphasized that the term "comprising / including" as used herein is used to specify the presence of the stated feature, integer, step, or component, but does not preclude the presence or addition of one or more other features, integers, steps, components, or groups thereof. As used herein, unless the context clearly indicates otherwise, the singular forms "a," "an," and "the" should also include the plural forms.

[0047] Typically, power systems are needed to integrate renewable energy on a large scale and transmit power from offshore stations to onshore stations. In power systems, alternating current (AC) choppers are used to absorb excess active power that may appear in the power system due to transient events / faults.

[0048] According to existing technology, AC choppers include thyristor valves that are connected to an AC power source via a step-down transformer. Furthermore, AC choppers use air-cooled resistors to absorb excess active power in the power system due to faults. However, this type of resistor and step-down transformer requires more space and increases the weight of the power system. This significantly increases the footprint / volume and cost of the power system.

[0049] In contrast to existing technologies, embodiments of this document provide a power system having at least one power control module that provides an improved AC chopper arrangement for absorbing excess active power in the power system.

[0050] Figure 1 and Figure 2 A power system 1000 is disclosed. The power system 1000 described herein can be configured to transmit power from an offshore station to an onshore station.

[0051] like Figure 1 and Figure 2 As shown, the power system 1000 includes an alternating current (AC) power source 200. In the disclosed embodiment, the AC power source 200 may be a wind power device operatively coupled to a power grid at a coupling point (PCC) 300. The power grid may be an offshore high-voltage direct current (HVDC) system. Alternatively, the AC power source 200 may be any other renewable energy-based power device (e.g., a photovoltaic (PV) source-based power device).

[0052] AC power supply 200 includes a first terminal 200a configured to connect to PCC 300 (e.g., via a switching element / connector) and a second terminal 200b configured to ground.

[0053] The power system 1000 also includes at least one power control module (also referred to as a thyristor-controlled braking resistor (TCBR)) 100 for at least one phase of the AC power supply 200. For simplicity, Figure 1 and Figure 2 The document describes a power system including a power control module 100 for a phase of an AC power supply 200.

[0054] The power control module 100 described herein can be configured to control power imbalance in a power system by absorbing excess active power. Two configurations of the power control module 100 are disclosed in the embodiments herein. The first configuration of the power control module 100 is as follows: Figure 1 As shown, the second configuration of the power control module 100 is as follows: Figure 2 As shown.

[0055] In the first configuration, such as Figure 1 As shown, the power control module 100 includes an AC chopper 90 and a first chopper resistor 80. The power control module 100 is connected to the first terminal 200a of the AC power supply 200 via the first chopper resistor 80. The power control module 100 is connected to the second terminal 200b of the AC power supply 200 via the AC chopper 90.

[0056] In the second configuration, such as Figure 2 As shown, the power control module 100 includes an AC chopper 90, a first chopper resistor 80, and a second chopper resistor 70. Specifically, in the second configuration, the power control module 100 is connected to the first terminal 200a of the AC power supply 200 via the first chopper resistor 80. The power control module 100 is connected to the second terminal 200b of the AC power supply 200 via the second chopper resistor 70.

[0057] refer to Figure 1 and Figure 2 The AC chopper 90 may include thyristor valves 75 connected in series. This series combination of thyristor valves 75 can be connected to the first terminal 200a of the AC power supply 200 via a first chopper resistor 80. Therefore, the need for a step-down transformer (as used in the prior art) to connect the AC chopper 90 to the AC power supply 200 is eliminated. Eliminating the need for a step-down transformer reduces the weight and footprint / volume of the power system 1000 and eliminates components containing large amounts of oil. Furthermore, eliminating the need for a step-down transformer when the AC chopper 90 is activated further reduces reactive power consumption.

[0058] The first chopper resistor 80 is configured to be liquid-cooled. In both the first and second configurations of the power control module 100, the first chopper resistor 80 is connected in series to the first terminal 90a of the AC chopper 90 and can be connected to the first terminal 200a of the AC power supply 200. The first chopper resistor 80 can be connected to the first terminal 200a of the AC power supply 200 via a second measuring element 52b. The second measuring element 52b is configured to measure the current in the AC power supply 200.

[0059] In addition, still refer to Figure 1 and Figure 2 The first chopper resistor 80 can be connected to the first measuring element 52a. In some examples, the first measuring element 52a can be located between the first chopper resistor 80 and the AC power supply 200, such as... Figure 1 and Figure 2As shown. In some examples, the first measuring element 52a may be located between the first chopper resistor 80 and the AC chopper 90 (not shown). Therefore, it should be understood that the arrangement or positioning of the first measuring element 52a may not be fixed. The first measuring element 52a is configured to measure the current of the first chopper resistor 80. The measured current is used to calculate the power loss of the first chopper resistor 80.

[0060] refer to Figure 2 The second chopper resistor 70 is configured to be liquid-cooled. Furthermore, the second chopper resistor 70 is connected in series to the second terminal 90b of the AC chopper 90. The second chopper resistor 70 can be connected to the second terminal 200b of the AC power supply 200.

[0061] Therefore, in the proposed power control module 100 of the power system 1000, the AC chopper 90 is directly connected to the AC power supply 200, and the first chopper resistor 80 and the second chopper resistor 70 (optionally) are configured to be liquid-cooled. As a result, the weight and volume of the power system 1000 can be significantly reduced.

[0062] Figure 3 A power system 1000 is disclosed, including first and second power control modules 100a and 100b for the first and second phases of an AC power supply 200. In one example, such as... Figure 3 As shown, the power system 1000 includes an AC power supply 200 having first and second phases. The AC power supply 200 is capable of being connected to a power network at a common coupling point (PCC) 300.

[0063] The power system 1000 also includes a first power control module 100a and a second power control module 100b for the first and second phases of the AC power supply 200, respectively.

[0064] The first power control module 100a is connected to a first terminal 200a corresponding to the first AC power supply 200 via a first chopper resistor 80. The first power control module 100a is connected to a second terminal 200b corresponding to the first AC power supply 200 via a second chopper resistor 70.

[0065] Similarly, the second power control module 100b is connected to the first terminal 200a corresponding to the second AC power supply 200 via the first chopper resistor 80. The second power control module 100b is connected to the second terminal 200b corresponding to the second AC power supply 200 via the second chopper resistor 70.

[0066] Each of the first and second power control modules 100a and 100b corresponds to Figure 2 and Figure 5BThe power control module 100 shown is used as an example; therefore, repeated descriptions of the first and second power control modules 100a and 100b are omitted here.

[0067] Figure 4A and Figure 4B A power system 1000 is disclosed, including first, second, and third power control modules 100a, 100b, and 100c for the first, second, and third phases of an AC power supply 200.

[0068] In one example, such as Figure 4A and Figure 4B As shown, the power system 1000 includes an AC power supply 200 having a first, second, and third phase. The AC power supply 200 is capable of being connected to the power network at a common coupling point (PCC) 300.

[0069] The power system 1000 also includes a first power control module 100a, a second power controller 100b, and a third power control module 100 for the first, second, and third phases of the AC power supply 200, respectively.

[0070] In some examples, such as Figure 4A As shown, the first, second, and third power control modules 100a, 100b, and 100c can be configured in a delta arrangement. In this delta arrangement, the first power control module 100a is connected to a first terminal 200a corresponding to the first AC power supply 200, and is connected to the second power control module 100b at a node 20b corresponding to the first chopper resistor 80 of the second power control module 100. The second power control module 100b is connected to a first terminal 200a corresponding to the second AC power supply 200, and is connected to the third power control module 100c at a node 20c corresponding to the first chopper resistor 80 of the third power control module 100c. The third power control module 100c is connected to a first terminal 200a corresponding to the third AC power supply 200, and is connected to the first power control unit 100a at a node 20a corresponding to the first chopper resistor 80 of the first power control module 100a.

[0071] In some examples, such as Figure 4BAs shown, the first, second, and third power control modules 100a, 100b, and 100c can be configured to be arranged in a Y-connection configuration. In the Y-connection, the first power control module 100a is connected to the first terminal 200a corresponding to the first AC power supply 200 and to a common connection node / point 25. The second power control module 100b is connected to the first terminal 200a corresponding to the second AC power supply 200 and to the common connection point 25. The third power control module 100c is connected to the first terminal 200a corresponding to the third AC power supply 200 and to the common connection node / point 25.

[0072] The first, second, and third power control modules 100a and 100b respectively correspond to Figure 2 and Figure 5B The power control module 100 shown is omitted here for further description.

[0073] Figure 5A A power control module 100 according to a first configuration is disclosed. For example... Figure 5A As shown, the power control module 100 includes an AC chopper 90 for one phase of a multiphase AC power supply and a first chopper resistor 80. The AC chopper 90 can use the first chopper resistor 80 to absorb excess active power in the power system, thereby addressing power imbalances in the power system.

[0074] AC chopper 200 includes thyristor valves 75 connected in series. The series combination of thyristor valves can be connected to an AC power supply via a first chopper resistor 80. Each thyristor valve 75 includes a plurality of thyristors connected in series.

[0075] The first chopper resistor 80 may include multiple resistor units connected in series and / or in parallel. Specifically, the first chopper resistor 80 is connected in series to the first terminal 90a of the AC chopper 90 and can be connected to the first terminal of the AC power supply. Thus, the AC chopper 90 is directly connected to the AC power supply.

[0076] In some examples, such as Figure 5A As shown, the first chopper resistor 80 can be connected to the first terminal 90a of the AC chopper 90 via the first measuring element 52a. The first chopper resistor 80 can be connected to the first terminal of the AC power supply via the second measuring element 52b. The first measuring element 52a can measure the current of the first chopper resistor 80, wherein the measured current is used to calculate the power loss of the first chopper resistor 80. The second measuring element 52b can measure the current in the AC power supply to detect any high current faults in the AC power supply.

[0077] Optionally, the power control module 100 may include a switching element 30. The switching element 30 may be configured to connect to a first chopper resistor 80 and to a second measuring element 52b. Thus, the switching element 30 may be used to isolate the first chopper resistor 80 and the thyristor valve 75 of the AC chopper 90 from the AC power supply 200.

[0078] In the disclosed embodiments, the first chopper resistor 80 is configured to be cooled by a liquid, that is, the first chopper resistor 80 can be cooled by any liquid, such as water or a mixture of water and ethylene glycol.

[0079] Still referencing Figure 5A The power control module 100 also includes a liquid cooling device 40. The liquid cooling device 40 can be configured to be connected to the first chopper resistor 80 for liquid cooling of the first chopper resistor 80. The liquid cooling device 40 can also be configured to be connected to each thyristor valve 75 of the AC chopper 90 for liquid cooling of the thyristor valve 75. It is understood that the same / general-purpose liquid cooling device 40 can be used for both the first chopper resistor 80 and the AC chopper 90, or a dedicated liquid cooling device 40 can be used for each of the first chopper resistor 80 and the AC chopper 90.

[0080] exist Figure 5A In some of the examples shown, the liquid cooling device 40 includes a water cooling device that uses water to cool the first chopper resistor 80 and / or each thyristor valve 75 of the AC chopper 90. The water cooling device includes a water deionization unit 40a. The water deionization unit 40a is configured to deionize raw water collected from the ocean via a water-to-water heat exchanger and uses the deionized water to cool or reduce the temperature of the first chopper resistor 80 and / or each thyristor valve 75 of the AC chopper 90. Therefore, the water deionization unit 40a may require considerably less space compared to prior art air cooling devices.

[0081] In some examples, the liquid cooling device 40 may use a mixture of water and ethylene glycol to cool the first chopper resistor 80 and / or each thyristor valve 75 of the AC chopper 90.

[0082] Figure 5B A power control module 100 according to a second configuration is disclosed. For example... Figure 5B As shown, the power control module 100 includes an AC chopper 90 for one phase of the multiphase AC power supply 200, a first chopper resistor 80, and a second chopper resistor 70.

[0083] Since they have already combined Figure 5AThe arrangement of the AC chopper 90 and the first chopper resistor 80 is described in detail; for the sake of brevity, repeated descriptions are omitted here.

[0084] The second chopper resistor 70 may include multiple resistor units connected in series and / or in parallel. Specifically, the second chopper resistor 80 is connected in series to the second terminal 90b of the AC chopper 90 and can be connected to the second terminal 200b of the AC power supply.

[0085] Furthermore, by implementing a second chopper resistor 70 in the power control module 100, the thyristor valve 75 of the AC chopper 90 can be connected between the first chopper resistor 80 and the second chopper resistor 70. This distributes the power loss of the AC chopper 90 across the first and second chopper resistors 80 and 70. Therefore, the thyristor valve can be protected from high fault currents.

[0086] In the disclosed embodiments, the second chopper resistor 70 is configured to be liquid-cooled, which makes it physically smaller compared to resistors configured to be air-cooled (as used in the prior art).

[0087] Still referencing Figure 5B The power control module 100 also includes a liquid cooling device 40. The liquid cooling device 40 can be configured to be connected to the first chopper resistor 80 for liquid cooling of the first chopper resistor 80. Furthermore, the liquid cooling device 40 can be configured to be connected to each thyristor valve 75 of the AC chopper 90 for liquid cooling of the thyristor valve 75. It is understood that in some examples, the same / general liquid cooling device (such as...) Figure 5B (As shown) can be used for the first chopper resistor 80, the second chopper resistor 70, and the AC chopper 90. In some examples, a dedicated liquid cooling device can be used for each of the first chopper resistor 80, the second chopper resistor 70, and the AC chopper 90.

[0088] In some examples, such as Figure 5B As shown, the liquid cooling device 40 includes a water cooling device that uses water to cool the first chopper resistor 80 and / or the second chopper resistor 70 and / or each thyristor valve 75 of the AC chopper 90. The water cooling device includes a water deionization unit 40a. The water deionization unit 40a is configured to deionize raw water collected from the ocean via a water-to-water heat exchanger and use the deionized water to cool or reduce the temperature of the first chopper resistor 80 and / or the second chopper resistor 70 and / or each thyristor valve 75 of the AC chopper 90.

[0089] In some examples, the liquid cooling device 40 may use a mixture of water and ethylene glycol to cool the first chopper resistor 80 and / or the second chopper resistor 70 and / or each thyristor valve 75 of the AC chopper 90.

[0090] Therefore, the power control module 100 is provided with a reduced footprint / volume for handling power imbalances in the power system.

[0091] The foregoing description of the specific embodiments will fully reveal the general nature of the embodiments herein, enabling others to readily modify and / or adapt such specific embodiments to various applications by applying present knowledge without departing from the general concepts. Therefore, such adaptations and modifications should and are intended to be understood within the meaning and scope of equivalents of the disclosed embodiments. It should be understood that the wording or terminology used herein is for descriptive purposes and not for limitation. Thus, while embodiments herein have been described with reference to preferred embodiments, those skilled in the art will recognize that the embodiments herein can be practiced with modifications within the scope of this disclosure.

Claims

1. A power control module (100), characterized in that, include: An AC chopper (90) is used for one phase of a multiphase AC power supply (200); as well as A first chopper resistor (80) is connected in series to the first terminal (90a) of the AC chopper (90) and is capable of being connected to the first terminal (200a) of the AC power supply (200), wherein the first chopper resistor (80) is configured to be cooled by a liquid.

2. The power control module (100) according to claim 1, characterized in that, The power control module (100) also includes: A liquid cooling device (40) is configured to be connected to the first chopper resistor (80) for liquid cooling of the first chopper resistor (80).

3. The power control module (100) according to claim 2, characterized in that, The liquid cooling device (40) is a water cooling device that includes a water deionization unit (40a).

4. The power control module (100) according to any one of the preceding claims, characterized in that, The first chopper resistor (80) is connected to the first measuring element (52a). The first measuring element (52a) is configured to measure the current of the first chopper resistor (80), which is used to calculate the power loss of the first chopper resistor (80).

5. The power control module (100) according to any one of the preceding claims, characterized in that, The first chopper resistor (80) can be connected to the first terminal (200a) of the AC power supply (200) via the second measuring element (52b). The second measuring element (52b) is configured to measure the current in the AC power supply (200).

6. The power control module (100) according to claim 5, characterized in that, The power control module (100) also includes: A switching element (30) is configured to be connected to the first chopper resistor (80) and is also capable of being connected to the second measuring element (52b).

7. The power control module (100) according to any one of the preceding claims, characterized in that, The first chopper resistor (80) includes multiple resistor units connected in series and / or in parallel.

8. The power control module (100) according to any one of the preceding claims, characterized in that, The power control module (100) also includes: A second chopper resistor (70) is connected in series to the second terminal (90b) of the AC chopper (90) and is capable of being connected to the second terminal (200b) of the AC power supply (200), wherein the second chopper resistor (70) is configured to be cooled by liquid.

9. The power control module (100) according to claim 8, characterized in that, The power control module (100) also includes: A liquid cooling device (40) is configured to be connected to the second chopper resistor (70) for liquid cooling of the second chopper resistor (70).

10. The power control module (100) according to claim 9, characterized in that, The liquid cooling device (40) is a water cooling device that includes a water deionization unit (40a).

11. The power control module (100) according to any one of the preceding claims, characterized in that, The AC chopper (90) includes: The series-connected thyristor valves (75) are connected to the AC power supply (200) via the first chopper resistor (80), wherein each thyristor valve (75) includes a plurality of thyristors connected in series.

12. The power control module (100) according to claim 11, characterized in that, The power control module (100) includes: A liquid cooling device (40) is configured to be connected to each thyristor valve (75) for liquid cooling of the thyristor valve (75).

13. A power system (1000), characterized in that, include: AC power supply (200V); as well as At least one power control module (100) according to any one of claims 1 to 11 is used for at least one phase of the AC power supply (200). The at least one power control module (100) is connected to the first terminal (200a) of the AC power supply (200) via the first chopper resistor (80) and to the second terminal of the AC power supply (200) via the AC chopper (90).

14. The power system (1000) according to claim 13, characterized in that, The at least one power control module (100) includes a second chopper resistor (70) and is connected to the second terminal (200b) of the AC power supply (200) via the second chopper resistor (70).

15. The power system (1000) according to any one of claims 13 to 14, characterized in that, The power system (1000) also includes: The AC power supply (200) includes a first phase, a second phase, and a third phase; and First, second, and third power control modules (100a, 100b, 100c) are respectively used for the first phase, the second phase, and the third phase, each of the first, second, and third power control modules (100a, 100b, 100c) is a power control module (100) according to any one of claims 1 to 11, wherein the first, second, and third power control modules (100a, 100b, 100c) are configured to be arranged in a triangular configuration.

16. The power system (1000) according to claim 15, characterized in that, The first, second, and third power control modules (100a, 100b, 100c) are configured to be arranged in a Y-shape.

17. The power system (1000) according to any one of claims 13 to 16, characterized in that, The AC power supply (200) is a wind power device that is operatively coupled to the power grid at the coupling point PCC (300).

18. The power system (1000) according to claim 17, characterized in that, The power network is an offshore high-voltage direct current (HVDC) system.

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