A PWM voltage regulation control circuit for solid-state load banks

Abstract

This invention discloses a PWM voltage regulation control circuit for solid-state load cells. The circuit includes a power supply, a control power supply, a control computer, a common control module, a power / data bus integrated module, and several load cell power modules. The power supply is connected to the common control module via a power supply interface, the control power supply is connected to the common control module via a control power supply interface, the control computer is connected to the common control module via a control computer interface, and the common control module is connected to the power / data bus integrated module via power and data lines. The power / data bus integrated module has several power / data integration interfaces, and each load cell power module is connected to the power / data bus integrated module via one of these interfaces. This invention not only effectively extends the service life of the load cell but also meets different capacity requirements, exhibiting wide applicability.

Description

Technical Field

[0001] This invention relates to the field of shipbuilding, and in particular to a PWM voltage regulation control circuit for a solid load cell. Background Technology

[0002] As modern ships increasingly demand electricity, generator capacity has grown accordingly to meet these needs. During the outfitting phase at the dock, the load cell capacity required for generator load testing also increases. Current load cells utilize tiered contactor control, which presents several problems. For instance, some heat pipes in certain load cells may operate at full load for extended periods, while non-operating heat pipes remain unpowered, easily leading to localized damage. Furthermore, repairs require disassembling and measuring each heat pipe individually, consuming significant time. Summary of the Invention

[0003] To address the shortcomings of the existing technology, this invention provides a PWM voltage regulation control circuit for solid-state load cells, which can not only effectively extend the service life of the load cell, but also meet the requirements of different capacities as needed, and has wide applicability.

[0004] To achieve the above-mentioned objectives, the present invention provides the following technical solution:

[0005] A PWM voltage regulation control circuit for a solid-state load bank, the circuit includes a power supply, a control power supply, a control computer, a common control module, a power / data bus integrated module, and several load bank power modules;

[0006] The power supply is connected to the common control module via a power supply interface, the control power supply is connected to the common control module via a control power supply interface, the control computer is connected to the common control module via a control computer interface, the common control module is connected to the power / data bus integration module via power lines and data lines, the power / data bus integration module is provided with several power / data integration interfaces, and the load box power modules are connected to the power / data bus integration module via one power / data integration interface.

[0007] Furthermore, the common control module includes a main switch, a power measurement and transmission module, a variable inductive load, a central control unit, a power switching module, and a cooling fan. The main switch and the power measurement and transmission module are both located on the main branch of the power cable line, while the variable inductive load and the power switching module are located on the branch branches of the power cable line. The power switching module is connected to the control power supply and is connected to the central control unit and the cooling fan via a power line. The power switching module includes a transformer module for adjusting the output voltage. The central control unit is connected to the control power supply, the main switch, the power measurement and transmission module, the variable inductive load, the power switching module, and the cooling fan via a data line. The central control unit receives control signals transmitted from the control computer and controls the operation of each component according to the control signals.

[0008] Furthermore, the power / data bus integration module is equipped with a control power / signal receiving terminal, a total power receiving terminal, several control power / signal output terminals, and several power output terminals. The control power / signal receiving terminals are respectively connected to the main control unit and the power switching module. The total power receiving terminal is located on the main line of the power cable. The control power / signal output terminals and the power output terminals are connected to the load box power module. The power output terminals are located on the branch lines of the power cable.

[0009] Furthermore, the power module of the load bank includes a three-phase voltage regulator, a resistive load, a three-phase solid-state contactor, a fixed inductive load, a power module control unit, and a power module cooling fan. One path of the power output terminal is used for the three-phase voltage regulator and the resistive load, and the other path is used for the three-phase solid-state contactor and the fixed inductive load. The power transmitted from the control power / signal output terminal is used for the power module control unit and the power module cooling fan. The power module control unit is connected to the three-phase voltage regulator, the three-phase solid-state contactor, and the power module cooling fan. The power module control unit is used to receive signals transmitted from the control power / signal output terminal and issue commands to control the three-phase voltage regulator, the three-phase solid-state contactor, and the power module cooling fan to work according to the received signals.

[0010] Furthermore, the circuit includes a common control module and up to 10 load bank power modules, wherein the load bank power modules have a maximum active power of 400KW and a maximum reactive power of 384Kvar.

[0011] Furthermore, the maximum reactive power of the variable inductive load is 127 kvar, the minimum reactive power is 1 kvar, and its accuracy is 1 kvar.

[0012] Furthermore, the fixed inductive load includes three fixed reactances of 450V and 128Kvar.

[0013] According to the above technical solution, the present invention has the following advantages: 1. Through the design of a common control module and several load box power modules, the number of connected load box power modules can be adjusted according to needs, thus having wide applicability and avoiding the problem of wasted capacity; 2. In the present invention, the resistive load's power output is adjusted by a three-phase voltage regulator, thus avoiding the problem of the heating element being easily damaged due to the partial work and partial inactivity of the resistive load; 3. In the present invention, when the main control unit, cooling fan, power module control unit, and power module cooling fan are powered by a control power supply, the use of the main power supply can be avoided, maximizing the efficiency of power supply. 4. When there is no control power supply, the power switching module provides power to the main control unit, cooling fan, power module control unit, and power module cooling fan after voltage adjustment; 5. Insulated gate bipolar transistors (IGBTs) are used extensively as power control devices, reducing the use of contactors, lowering manufacturing costs, and reducing vibration interference; 6. Since there are no contactor contacts, power can be smoothly and frequently changed; 7. Pulse width modulation (PWM) switching power supply output is used to keep the power supply output voltage constant when operating conditions change. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the overall structure of a PWM voltage regulation control circuit for a solid-state load bank according to the present invention. Detailed Implementation

[0015] The present invention will be further described in detail below with reference to the accompanying drawings and specific examples, so as to make a clearer understanding of its structural type and usage, but this should not be used to limit the scope of protection of the present invention patent.

[0016] like Figure 1 As shown, a PWM voltage regulation control circuit for a solid-state load bank includes a power supply 1, a control power supply 2, a control computer 3, a common control module 4, a power / data bus integrated module 5, and several load bank power modules 6.

[0017] The power supply 1 is connected to the common control module 4 through a power supply interface. The control power supply 2 is connected to the common control module 4 through a control power supply interface. The control computer 3 is connected to the common control module 4 through a control computer interface. The common control module 4 is connected to the power / data bus integration module 5 through power lines and data lines. The power / data bus integration module 5 is provided with several power / data integration interfaces. The load box power module 6 is connected to the power / data bus integration module 5 through one power / data integration interface.

[0018] The common control module 4 includes a main switch 4-1, a power measurement and transmission module 4-2, a variable inductive load 4-3, a main control unit 4-4, a power switching module 4-5, and a cooling fan 4-6. The main switch 4-1 and the power measurement and transmission module 4-2 are both located on the main branch of the power cable line. The variable inductive load 4-3 and the power switching module 4-5 are respectively located on the branch branches of the power cable line. The power switching module 4-5 is connected to the control power supply 2. The power switching module 4-5 is connected to the main control unit 4-4 and the cooling fan 4-6 via power lines. The switching module 4-5 includes a transformer module for adjusting the output voltage. The main control unit 4-4 is connected to the control power supply 2, the main switch 4-1, the power measurement and transmission module 4-2, the variable inductive load 4-3, the power switching module 4-5, and the cooling fan 4-6 via data lines. The main control unit 4-4 receives control signals transmitted from the control computer 3 and controls the operation of each component according to the control signals. The variable inductive load 4-3, under the control of the main control unit 4-4, provides a maximum reactive power of 127 kvar and a minimum of 1 kvar, with an accuracy of 1 kvar.

[0019] The power / data bus integration module 5 is equipped with a control power / signal receiving terminal, a total power receiving terminal, several control power / signal output terminals, and several power output terminals. The control power / signal receiving terminals are respectively connected to the main control unit 4-4 and the power switching module 4-5. The total power receiving terminal is located on the main line of the power cable line. The control power / signal output terminals and power output terminals are connected to the load box power module 6. The power output terminals are located on the branch lines of the power cable line.

[0020] The load bank power module 6 includes a three-phase voltage regulator 6-1, a resistive load 6-2, a three-phase solid-state contactor 6-3, a fixed inductive load 6-4, a power module control unit 6-5, and a power module cooling fan 6-6. One path of the power output terminal supplies power to the three-phase voltage regulator 6-1 and the resistive load 6-2, and the other path supplies power to the three-phase solid-state contactor 6-3 and the fixed inductive load 6-4. The power transmitted from the control power / signal output terminal supplies power to the power module control unit 6-5 and the power module cooling fan 6-6, respectively. The power module control unit 6-5 is connected to the three-phase voltage regulator 6-1, the three-phase solid-state contactor 6-3, and the power module cooling fan 6-6. The power module control unit 6-5 is used to receive signals transmitted from the control power / signal output terminal and issue commands to control the three-phase voltage regulator 6-1, the three-phase solid-state contactor 6-3, and the power module cooling fan 6-6 according to the received signals. The three-phase voltage regulator 6-1 is a PWM voltage regulation module, and the fixed inductive load 6-4 includes three fixed reactors with a voltage of 450V and a capacity of 128Kvar.

[0021] The control power supply 2 needs to be connected separately and kept constantly powered. When the load test is carried out continuously for a long time, the power supply 1 can be switched through the power supply and switching module 4-5 in the common control module 4 to supply power to the main control unit (4-4), the cooling fan 4-6 and the power module cooling fan 6-6.

[0022] The circuit includes a common control module 4 and up to 10 load bank power modules 6, wherein the load bank power module 6 has a maximum active power of 400KW and a maximum reactive power of 384Kvar.

[0023] The fan includes a cooling fan 4-6 and a power module cooling fan 6-6. The host computer refers to the control computer 3. Through the control computer 3 and the main control unit 4-4, the cooling fan 4-6 and the power module cooling fan 6-6 are turned on in advance and turned off after a delay to avoid damage to the variable inductive load 4-3, resistive load 6-2 and fixed inductive load 6-4 due to overheating.

[0024] In operation, the coordinated operation of each component is controlled step-by-step by the central control unit 4-4. The active power component calculates and adjusts the three-phase voltage regulator 6-1 in its load bank power module 6 to regulate the active load. Reactive power is regulated through a combination of the three-phase solid-state contactor 6-3 in the load bank power module 6 and the variable inductive load 4-3 in the common control module 4. The overall maximum load is... Ten power modules are used under maximum load.

[0025] The active power is 10 × 400 = 4000 KW.

[0026] The reactive power is (10×3+1)×128—1=3967Kvar (10 groups within the power module, 3 in each group, and one group of variable reactance in the common module, with a maximum of 127Kvar and a resolution of 1Kvar).

[0027] Users typically provide two parameters: active power and power factor. Reactive power parameters are calculated from these two parameters. Below are two examples illustrating the operating status of each module during operation.

[0028] Given a maximum load of 4000KW, At that time, its reactive power is calculated as follows:

[0029]

[0030] Because the designed reactive power capacity is 3967Kvar, which is greater than the actual maximum reactive power capacity required of 3000KVA, it can meet the reactive power requirements under the maximum active load.

[0031] At this time, through the calculation of the main control unit 4-4, the active part of the three-phase voltage regulator 6-1 of each load box power module 6 is ordered to be in full load state. The reactive part needs to be completed by turning on a total of 23 three-phase solid contactors 6-3 distributed on each module to connect the fixed inductive load 6-4 and the variable inductive load 4-3 on the common control module 4 (adjusted to 56Kvar). At this time, the reactive load is 128×23+56=3000Kvar.

[0032] Given an active power load of 3000KW, At that time, its reactive power is calculated as follows:

[0033]

[0034] At this time, through the calculation of the main control unit 4-4, the active part of the three-phase voltage regulator 6-1 of each load box power module 6 is ordered to be in a 75% load state. The reactive part needs to be completed by turning on a total of 11 three-phase solid contactors 6-3 distributed on each module to connect the fixed inductive load 6-4 and the variable inductive load 4-3 on the common control module 4 (adjusted to 45Kvar). At this time, the reactive load is 128×11+45=1453Kvar.

[0035] Undoubtedly, the present invention may have other similar structural compositions and uses besides the embodiments described above. In summary, the present invention also includes other modifications and substitutions that will be obvious to those skilled in the art.

Claims

1. A PWM voltage regulation control circuit for a solid-state load bank, characterized in that, The circuit includes a power supply (1), a control power supply (2), a control computer (3), a common control module (4), a power / data bus integrated module (5), and several load box power modules (6); The power supply (1) is connected to the common control module (4) through the power supply interface, the control power supply (2) is connected to the common control module (4) through the control power supply interface, the control computer (3) is connected to the common control module (4) through the control computer interface, the common control module (4) is connected to the power / data bus integration module (5) through the power line and the data line, the power / data bus integration module (5) is provided with several power / data integration interfaces, and the load box power module (6) is connected to the power / data bus integration module (5) through one power / data integration interface respectively; The common control module (4) includes a main switch (4-1), a power measurement and transmission module (4-2), a variable inductive load (4-3), a main control unit (4-4), a power switching module (4-5), and a cooling fan (4-6). The main switch (4-1) and the power measurement and transmission module (4-2) are both located on the main line of the power cable. The variable inductive load (4-3) and the power switching module (4-5) are respectively located on the branch lines of the power cable. The power switching module (4-5) is connected to the control power supply (2). -5) is connected to the main control unit (4-4) and the cooling fan (4-6) via a power line. The power switching module (4-5) is equipped with a transformer module for adjusting the output voltage. The main control unit (4-4) is connected to the control power supply (2), the main switch (4-1), the power measurement and transmission module (4-2), the variable inductive load (4-3), the power switching module (4-5), and the cooling fan (4-6) via a data line. The main control unit (4-4) is used to receive the control signal transmitted by the control computer (3) and control the operation of each component according to the control signal.

2. The PWM voltage regulation control circuit for a solid-state load bank according to claim 1, characterized in that, The power / data bus integration module (5) is provided with a control power / signal receiving terminal, a total power receiving terminal, several control power / signal output terminals and several power output terminals. The control power / signal receiving terminals are respectively connected to the main control unit (4-4) and the power switching module (4-5). The total power receiving terminal is located on the main line of the power cable line. The control power / signal output terminals and the power output terminals are connected to the load box power module (6). The power output terminals are located on the branch lines of the power cable line.

3. The PWM voltage regulation control circuit for a solid-state load bank according to claim 2, characterized in that, The load bank power module (6) includes a three-phase voltage regulator (6-1), a resistive load (6-2), a three-phase solid-state contactor (6-3), a fixed inductive load (6-4), a power module control unit (6-5), and a power module cooling fan (6-6). One path of the power output terminal is used for the three-phase voltage regulator (6-1) and the resistive load (6-2), and the other path is used for the three-phase solid-state contactor (6-3) and the fixed inductive load (6-4). The power output terminal transmits power to the three-phase voltage regulator (6-1) and the resistive load (6-2), respectively. Used for power module control unit (6-5) and power module cooling fan (6-6), the power module control unit (6-5) is connected to three-phase voltage regulator (6-1), three-phase solid-state contactor (6-3) and power module cooling fan (6-6) for data connection. The power module control unit (6-5) is used to receive signals transmitted from the control power / signal output terminal and issue instructions to control the three-phase voltage regulator (6-1), three-phase solid-state contactor (6-3) and power module cooling fan (6-6) to work according to the received signals.

4. The PWM voltage regulation control circuit for a solid-state load bank according to claim 1, characterized in that, The circuit includes a common control module (4) and up to 10 load bank power modules (6), wherein the load bank power modules (6) have a maximum active power of 400KW and a maximum reactive power of 384Kvar.

5. The PWM voltage regulation control circuit for a solid-state load bank according to claim 1, characterized in that, The maximum reactive power of the variable inductive load (4-3) is 127 kvar, the minimum reactive power is 1 kvar, and its accuracy is 1 kvar.

6. The PWM voltage regulation control circuit for a solid-state load bank according to claim 1, characterized in that, The fixed inductive load (6-4) consists of three fixed reactors with a voltage of 450V and a capacity of 128Kvar.

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