A shaft generator parallel operation system and a parallel operation control method

Abstract

This invention provides a shaft-driven generator parallel operation system and parallel operation control method, comprising: a management and control module, multiple switches, multiple diesel engines and a shaft-driven engine, wherein each diesel generator and each shaft-driven engine corresponds to a switch. The management and control module is connected to the multiple diesel engines and the shaft-driven engine via a PMS detection circuit, a PMS adjustment circuit, a PMS switch control circuit, a PMS-inverter communication circuit, an inverter detection circuit, and an inverter switch control circuit. The multiple switches are connected to the multiple diesel engines and the shaft-driven engine respectively. Utilizing the ultra-high response speed of the shaft-driven generator system, the system can follow the diesel generator, solving the problem of parallel operation being affected by inconsistent response speeds, and reducing the serious risk of significant economic losses and even impact on ship delivery caused by parallel operation failure.

Description

Technical Field

[0001] This invention belongs to the field of generator technology, and specifically relates to a shaft-driven generator parallel operation system and parallel operation control method. Background Technology

[0002] Fixed-pitch propeller shaft-driven generator systems are becoming increasingly widely used. As is well known, ships are propelled by the thrust generated by a rotating propeller. A fixed-pitch propeller shaft-driven generator system involves mounting the shaft-driven generator system and propeller on the same shaft (which may be divided into several sections). The rotation of the shaft simultaneously drives the propeller and the shaft-driven generator to generate electricity. When the voltage, frequency, and phase of the shaft-driven generator and the diesel generator are adjusted to be essentially the same (hereinafter referred to as the three elements of parallel operation), the shaft-driven generator's power generation is successfully paralleled with the ship's diesel generator, achieving parallel operation. Current parallel operation technology typically treats the shaft-driven generator as an ordinary diesel generator, with the power plant management system (PMS) separately detecting, adjusting, and controlling the three elements of parallel operation for both the power grid and the generator to be paralleled. (See brief...) Figure 1 In the diagram, 1 represents the detection circuit, 2 represents the adjustment circuit, and 3 represents the switch control circuit. The working principle is that the PMS detects the three elements of parallel operation of the power grid and the generator to be paralleled through circuit 1, then issues a command through circuit 2 to adjust these three elements. After adjustment, the PMS controls the switch of the generator to be paralleled through circuit 3 to achieve parallel operation. The existing technology has the following problems: (1) The response speeds of shaft-driven generators and diesel generators differ greatly, which can easily lead to paralleling failure. The adjustment circuit of a diesel generator is a mechanical response, while the adjustment circuit of a shaft-driven generator is an electronic response, which is much faster than the mechanical response and affects paralleling.

[0003] (2) Since the parallel operation test of the fixed-pitch propeller shaft generator system can only be carried out during the sea trial phase, and since it has not been verified at the dock, the parallel operation system of the shaft generator is extremely prone to problems, which will take a lot of time to troubleshoot and will also result in huge economic losses, and may even have serious consequences that affect the delivery of the ship. Therefore, how to solve the problem of the large difference in response speed between the shaft generator and the diesel generator is a technical problem that urgently needs to be solved in this field. Summary of the Invention

[0004] The purpose of this invention is to provide a shaft-driven generator parallel operation system and a parallel operation control method.

[0005] According to a first aspect of the present invention, a shaft-driven generator parallel operation system is provided, comprising a management control module, multiple switches, multiple diesel engines and a shaft-driven engine, wherein each diesel generator and each shaft-driven engine corresponds to one switch, wherein: The management and control module is connected to the multiple diesel engines and the shaft-driven engine respectively through the PMS detection circuit, PMS adjustment circuit, PMS switch control circuit, PMS and inverter communication circuit, inverter detection circuit and inverter switch control circuit.

[0006] Optionally, the management and control module is connected to the frequency converter via a fourth switch, the frequency converter is connected to the shaft-driven motor, and the fourth switch is connected to the second bus.

[0007] Optionally, the management and control module is connected to the first diesel engine via a first speed governor, and the first diesel generator is connected to the first bus via a first switch.

[0008] Optionally, the management and control module is connected to the second diesel engine via the second speed governor, and the second diesel engine is connected to the first bus via the second switch.

[0009] Optionally, the management and control module is connected to the third diesel engine via a third speed governor, and the second diesel generator is connected to the second bus via a third switch.

[0010] Optionally, the second busbar is connected to the first busbar via a control switch.

[0011] Optionally, the first busbar and the second busbar are busbars of a switchboard.

[0012] Optionally, the management control module is connected to the frequency converter through the frequency converter detection circuit and the PMS-frequency converter communication circuit.

[0013] According to a second aspect of the present invention, a method for parallel operation control of a shaft-driven generator is provided, comprising the shaft-driven generator parallel operation system as described in any one of the first aspects of the present invention; the method comprising: When parallel operation is required, the PMS notifies the inverter through the PMS-inverter communication loop. The frequency converter detects the three requirements for parallel operation of the power grid through the frequency converter detection circuit, and adjusts the three elements of parallel operation of the shaft-driven generator system through the frequency converter so that the three elements of parallel operation of the shaft-driven generator system are the same as those of the power grid.

[0014] Optionally, the method further includes: Parallel operation is achieved through the inverter switch control circuit. After parallel operation is completed, the PMS controls the shaft-driven generator through the PMS detection circuit, PMS adjustment circuit, and inverter communication circuit.

[0015] The beneficial effects of this invention are as follows: As can be seen from the above scheme, the embodiments of the present invention provide a shaft-driven generator parallel operation system, including: a management and control module, multiple switches, multiple diesel engines and shaft-driven engines, wherein each diesel generator and each shaft-driven engine corresponds to a switch, wherein: the management and control module is connected to the multiple diesel engines and the shaft-driven engine respectively through a PMS detection circuit, a PMS adjustment circuit, a PMS switch control circuit, a PMS and inverter communication circuit, an inverter detection circuit and an inverter switch control circuit, and the multiple switches are used to connect to the multiple diesel engines and the shaft-driven engines respectively. By utilizing the ultra-high response speed of the shaft-driven generator system, the shaft-driven generator system can follow the diesel generator to operate, thus solving the problem of parallel operation being affected by inconsistent response speeds. Attached Figure Description

[0016] Figure 1 A schematic diagram of a shaft-driven generator parallel operation system provided for the prior art; Figure 2 This is a schematic diagram of a shaft-driven generator parallel operation system provided in an embodiment of this application. Detailed Implementation

[0017] To make the objectives, technical solutions, and advantages of this invention clearer, the technical solutions of the embodiments of this invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this invention. Based on the embodiments of this invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this invention.

[0018] According to a first aspect of the present invention, a shaft-driven generator parallel operation system is provided, comprising a management control module, multiple switches, multiple diesel engines and shaft-driven engines, wherein each diesel generator and shaft-driven engine corresponds to one switch, wherein: The management and control module is connected to multiple diesel engines G and shaft-driven engines SG via PMS detection loop 1, PMS adjustment loop 2, PMS switch control loop 3, PMS and inverter communication loop 4, inverter detection loop 5 and inverter switch control loop 6, using multiple switches respectively.

[0019] The number of switches is not specifically limited in this application. The switches can be connected to a diesel engine or a shaft-driven engine.

[0020] Optionally, the management control module is connected to the frequency converter via the fourth switch, the frequency converter is connected to the shaft-driven motor, and the fourth switch is connected to the second bus.

[0021] Optionally, the management and control module is connected to the first diesel engine via the first speed governor, and the first diesel generator is connected to the first bus via the first switch.

[0022] Optionally, the management control module is connected to the second diesel engine via the second speed governor, and the second diesel generator is connected to the first bus via the second switch.

[0023] Optionally, the management control module is connected to the third diesel engine via the third speed governor, and the second diesel generator is connected to the second bus via the third switch.

[0024] Optionally, the second busbar is connected to the first busbar via a control switch.

[0025] Optionally, the first busbar and the second busbar are busbars of the switchboard.

[0026] Optionally, the management control module is connected to the frequency converter through the frequency converter detection loop and the PMS communication loop with the frequency converter.

[0027] According to a second aspect of the present invention, a method for parallel operation control of a shaft-driven generator is provided, comprising the shaft-driven generator parallel operation system of any one of the embodiments in the first embodiment, the method comprising: When parallel operation is required, the PMS (Power Management System) notifies the inverter through the communication loop between the PMS and the inverter. The frequency converter detects the three requirements for parallel operation of the power grid through the frequency converter detection circuit, and adjusts the three elements of parallel operation of the shaft-driven generator system through the frequency converter so that the three elements of parallel operation of the shaft-driven generator system are the same as those of the power grid.

[0028] Optionally, the method further includes: Parallel operation is achieved through the inverter switch control circuit. After parallel operation is completed, the PMS controls the shaft-driven generator through the PMS detection circuit, PMS adjustment circuit, and inverter communication circuit.

[0029] Specifically, such as Figure 2 As shown, G1-G3 represent diesel generators, SG represents shaft-driven generators, Q1-Q4 represent generator switches, busbar A and busbar B represent the busbars of the distribution board, speed governor represents the speed governor of the diesel generator, frequency converter represents the frequency converter of the shaft-driven generator, PMS represents the ship power station management system, 1 represents the PMS detection circuit, 2 represents the PMS adjustment circuit, 3 represents the PMS switch control circuit, 4 represents the PMS and frequency converter communication circuit, 5 represents the frequency converter detection circuit, and 6 represents the frequency converter switch control circuit.

[0030] When parallel operation is required, the PMS informs the inverter through the PMS-inverter communication circuit (4). The inverter detects the three requirements for parallel operation of the power grid through the inverter detection circuit (5) and adjusts the three elements of parallel operation of the shaft-driven generator system through the inverter, so that the three elements of parallel operation of the shaft-driven generator system are consistent with the power grid (the ultra-high response speed of the shaft-driven generator system enables the shaft-driven generator system to follow the diesel generator). Finally, parallel operation is achieved through the inverter switch control circuit (6). After parallel operation is completed, the PMS controls the shaft-driven generator through the PMS detection circuit (1), the PMS adjustment circuit (2), and the inverter communication circuit (4).

[0031] In summary, this invention provides a shaft-driven generator parallel operation system, comprising: a management and control module, multiple switches, multiple diesel engines and shaft-driven engines, with each diesel generator and shaft-driven engine corresponding to a switch. The management and control module uses multiple switches connected to the multiple diesel engines and shaft-driven engines via a PMS detection circuit, a PMS adjustment circuit, a PMS switch control circuit, a PMS-inverter communication circuit, an inverter detection circuit, and an inverter switch control circuit. Utilizing the ultra-high response speed of the shaft-driven generator system, the system enables the shaft-driven generator system to follow the diesel generator, solving the problem of parallel operation being affected by inconsistent response speeds. This reduces the risk of significant economic losses and even serious impacts on ship delivery caused by parallel operation failures.

[0032] The above are preferred embodiments of the present invention. It should be noted that, for those skilled in the art, several improvements and modifications can be made without departing from the principle of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A shaft-driven generator parallel operation system, characterized in that, The shaft-driven generator parallel operation system includes: a management and control module, multiple switches, multiple diesel engines and shaft-driven engines, wherein each diesel generator and each shaft-driven engine corresponds to one switch, wherein: The management and control module is connected to the multiple diesel engines and the shaft-driven engine respectively through the PMS detection circuit, PMS adjustment circuit, PMS switch control circuit, PMS and inverter communication circuit, inverter detection circuit and inverter switch control circuit.

2. The shaft-driven generator parallel operation system according to claim 1, characterized in that, The management and control module is connected to the frequency converter via the fourth switch, the frequency converter is connected to the shaft-driven motor, and the fourth switch is connected to the second bus.

3. The shaft-driven generator parallel operation system according to claim 1, characterized in that, The management and control module is connected to the first diesel engine via the first speed governor, and the first diesel generator is connected to the first bus via the first switch.

4. The shaft-driven generator parallel operation system according to claim 1, characterized in that, The management and control module is connected to the second diesel engine via the second speed governor, and the second diesel engine is connected to the first bus via the second switch.

5. The shaft-driven generator parallel operation system according to claim 1, characterized in that, The management and control module is connected to the third diesel engine via the third speed governor, and the second diesel generator is connected to the second bus via the third switch.

6. The shaft-driven generator parallel operation system according to claim 5, characterized in that, The second busbar is connected to the first busbar via a control switch.

7. The shaft-driven generator parallel operation system according to claim 6, characterized in that, The first busbar and the second busbar are the busbars of the distribution board.

8. The shaft-driven generator parallel operation system according to claim 1, characterized in that, The management and control module is connected to the frequency converter through the frequency converter detection circuit and the PMS-frequency converter communication circuit.

9. A method for parallel operation control of a shaft-driven generator, characterized in that, Applied to the shaft-driven generator parallel operation system as described in any one of claims 1-8, the method comprises: When parallel operation is required, the PMS notifies the inverter through the PMS-inverter communication loop. The frequency converter detects the three requirements for parallel operation of the power grid through the frequency converter detection circuit, and adjusts the three elements of parallel operation of the shaft-driven generator system through the frequency converter so that the three elements of parallel operation of the shaft-driven generator system are the same as those of the power grid.

10. The parallel control method according to claim 9, characterized in that, The method further includes: Parallel operation is achieved through the inverter switch control circuit. After parallel operation is completed, the PMS controls the shaft-driven generator through the PMS detection circuit, PMS adjustment circuit, and inverter communication circuit.

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