Generator set parallel control system and generator set parallel control method

Abstract

The invention provides a generator set parallel control system and a generator set parallel control method, and belongs to the field of generator control. The system comprises a plurality of generator sets which are connected in parallel, a parallel switch cabinet and an upper computer controller, control systems and communication protocols of at least two generator sets are different, the two generator sets comprise the first generator set and the second generator set, the first generator set is provided with a special control system, and the second generator set is provided with a special switch cabinet. The second generator set is provided with a universal parallel unit controller which runs in parallel with the first generator set; the parallel switch cabinet is connected with each generator set and is used for executing synchronous closing operation; and the upper computer controller is in communication connection with the special control system of the first generator set and the universal parallel unit controller of the second generator set, and is used for controlling parallel operation of the first generator set and the second generator set by adopting a preset strategy. According to the scheme, the problem that a technical scheme for realizing effective parallel connection of different generator sets is lacked in the prior art is solved.

Description

Technical Field

[0001] The present application relates to the field of generator control, and in particular to a generator set parallel control system and a generator set parallel control method. Background Art

[0002] In the digital economy, data centers and communications hubs are increasingly reliant on high-power emergency power supplies. This often involves paralleling different high-power diesel generator sets to provide a stable and reliable power supply. However, due to incompatible control systems and ineffective communication between different brands of generator sets, synchronous paralleling and power distribution are difficult. This not only limits the flexibility and emergency response capabilities of the power system but also poses the risk of paralleling failure, overloaded unit disconnection, and even system collapse. Especially in unstable supply chains, a single-type generator set configuration can potentially impact data center operations due to supply crises.

[0003] In existing technology, most generator sets have independent control systems and differing parallel communication protocols, making effective parallel connection difficult. This technical barrier and supply chain limitations force data centers to rely on the same type of generator sets when expanding or upgrading their fleets, increasing operating costs and reducing system security and supply chain controllability. Existing technology lacks a technical solution for effectively paralleling generator sets with different control systems and communication protocols. Summary of the Invention

[0004] The main purpose of this application is to provide a generator set parallel control system and a generator set parallel control method, so as to at least solve the problem in the prior art of lacking a technical solution to achieve effective parallel connection of generator sets with different control systems and communication protocols.

[0005] In order to achieve the above-mentioned purpose, according to one aspect of the present application, a generator set parallel control system is provided, comprising: a plurality of generator sets connected in parallel, at least two of which have different control systems and communication protocols, the two generator sets comprising a first generator set and a second generator set, the first generator set being equipped with a dedicated control system, the parallel speed and voltage regulating port of the dedicated control system being in an open state or a non-fully open state, the second generator set being equipped with a universal parallel set controller running in parallel with the first generator set; a parallel switch cabinet connected to each of the generator sets for performing synchronous closing operations; a host computer controller, the host computer controller being respectively connected to the dedicated control system of the first generator set and the The universal parallel group controller of the second generator set is communicatively connected and is used to control the parallel operation of the first generator set and the second generator set using a preset strategy, wherein the preset strategy includes: when the parallel speed and voltage regulation port of the first generator set is in the open state, the host computer controller takes over the speed and voltage regulation function, and controls the parallel switch cabinet to close synchronously to achieve parallel operation; when the parallel speed and voltage regulation port of the first generator set is in the non-fully open state, the host computer controller activates the port opening drive circuit to drive the first generator set to open the parallel speed and voltage regulation port, and takes over the speed and voltage regulation function, and controls the parallel switch cabinet to close synchronously to achieve parallel operation.

[0006] Optionally, the host computer controller includes a speed and voltage regulation module for adjusting the PID parameters of the voltage and speed regulation units of each of the generator sets to match the voltage, frequency and phase angle conditions required for the parallel operation.

[0007] Optionally, the generator set parallel control system further includes a parallel communication interface, which is composed of a communication cable between the host computer controller and each of the generator set controllers, and the communication cable is provided with impedance-matching terminal resistors at the head and tail units.

[0008] Optionally, the port opening drive circuit includes an intermediate relay for transmitting a control signal to activate the speed and voltage regulation function of the dedicated control system of the first generator set.

[0009] Optionally, the parallel switch cabinet includes a circuit breaker for performing synchronous closing and opening operations according to instructions from the host controller.

[0010] Optionally, the host computer controller has a built-in virtual bus voltage control system. When the parallel speed and voltage regulation port of the first generator set is in the non-fully open state, the virtual bus voltage control system is used to generate a virtual bus signal to drive the dedicated control system of the first generator set to open the parallel speed and voltage regulation port.

[0011] According to another aspect of the present application, a generator set parallel control method is provided, which is used for any one of the generator set parallel control systems, and the generator set parallel control method includes: judging whether the parallel speed regulation and voltage regulation port of the first generator set is in an open state or a non-fully open state; if the parallel speed regulation and voltage regulation port of the first generator set is in the open state, controlling the upper controller to take over the speed regulation and voltage regulation function, and controlling the parallel switch cabinet to perform synchronous closing operation to achieve parallel operation between the first generator set and the second generator set; if the parallel speed regulation and voltage regulation port of the first generator set is in the non-fully open state, controlling the upper controller to activate the port opening drive circuit to drive the first generator set to open the parallel speed regulation and voltage regulation port, and controlling the upper controller to take over the speed regulation and voltage regulation function, and controlling the parallel switch cabinet to synchronously close to achieve parallel operation between the first generator set and the second generator set.

[0012] Optionally, if the parallel speed and voltage regulation port of the first generator set is in the open state, the upper controller is controlled to take over the speed and voltage regulation function, including: if the parallel speed and voltage regulation port of the first generator set is in the open state, the actual voltage, frequency and phase angle of the parallel bus are detected, and compared with the output voltage, frequency and phase angle of the first generator set to determine the initial deviation of speed and voltage regulation; according to the initial deviation, the PID parameters of the speed and voltage regulation unit of the first generator set are adjusted until the voltage, frequency and phase angle of the first generator set and the second generator set are within a preset range.

[0013] Optionally, if the parallel speed regulation and voltage regulation port of the first generator set is in the non-fully open state, the upper controller is controlled to activate the port opening drive circuit to drive the first generator set to open the parallel speed regulation and voltage regulation port, including: if the parallel speed regulation and voltage regulation port of the first generator set is in the non-fully open state, a port opening request signal is sent to the dedicated control system of the first generator set, requesting to open the parallel speed regulation and voltage regulation port of the first generator set; if the dedicated control system responds and allows the parallel speed regulation and voltage regulation port of the first generator set to be opened, the upper controller is controlled to activate the port opening drive circuit to generate a corresponding control signal; the control signal is transmitted to the first generator set to drive the first generator set to open the parallel speed regulation and voltage regulation port.

[0014] Optionally, after adjusting the PID parameters of the speed and voltage regulating unit of the first generator set according to the initial deviation until the voltage, frequency and phase angle of the first generator set and the second generator set are within a preset range, the method further includes: using a parallel communication interface to transmit the adjusted PID parameters to the controllers of the first generator set and the second generator set to update the control parameters of the speed and voltage regulating units of each generator set.

[0015] Applying the technical solution of the present application, the generator set parallel control system includes multiple generator sets in parallel, parallel switch cabinets and host computer controllers, the control systems and communication protocols of at least two generator sets are different, the two generator sets include a first generator set and a second generator set, the first generator set is equipped with a dedicated control system, the parallel speed and voltage regulating port of the dedicated control system is in an open state or a non-fully open state, the second generator set is equipped with a universal parallel set controller running in parallel with the first generator set; the parallel switch cabinet is connected to each generator set for performing a synchronous closing operation; the host computer controller is respectively connected to the dedicated control system of the first generator set and a communication connection with a universal parallel group controller of the second generator set, for controlling the parallel operation of the first generator set and the second generator set using a preset strategy, wherein the preset strategy includes: when the parallel speed and voltage regulation port of the first generator set is in an open state, the host computer controller takes over the speed and voltage regulation function and controls the parallel switch cabinet to close synchronously to achieve parallel operation; when the parallel speed and voltage regulation port of the first generator set is in a non-fully open state, the host computer controller activates the port opening drive circuit to drive the first generator set to open the parallel speed and voltage regulation port, and takes over the speed and voltage regulation function, and controls the parallel switch cabinet to close synchronously to achieve parallel operation. In this solution, through the intelligent coordination of the host computer controller, when the parallel speed and voltage regulation port of the first generator set is open, it can directly take over its speed and voltage regulation function, and achieve rapid synchronous closing and parallel operation with the second generator set; and when the port is in a non-fully open state, the port opening drive circuit is activated to prompt the first generator set to open the parallel speed and voltage regulation port, and then take over the speed and voltage regulation function, and also achieve parallel operation with the second generator set. It not only overcomes the control barriers caused by incompatible communication protocols between different generator sets, but also ensures the consistency of voltage, frequency and phase angle under parallel operation conditions, thereby solving the problem of lack of technical solutions in the existing technology to achieve effective parallel connection of different generator sets. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The drawings that constitute part of this application are used to provide a further understanding of this application. The illustrative embodiments of this application and their descriptions are used to explain this application and do not constitute an improper limitation on this application. In the drawings:

[0017] Figure 1A schematic structural diagram of a generator set parallel control system provided in an embodiment of the present application is shown;

[0018] Figure 2 A schematic flow chart of a method for controlling parallel connection of generator sets according to an embodiment of the present application is shown;

[0019] Figure 3 Shows a first system diagram of two second diesel generator sets connected in parallel with two first diesel generator sets;

[0020] Figure 4 A second system diagram of two second diesel generator sets connected in parallel with two first diesel generator sets is shown;

[0021] Figure 5 The figure shows a structural block diagram of a generator set parallel control device provided according to an embodiment of the present application.

[0022] The above drawings include the following reference numerals:

[0023] 01. Generator set parallel control system; 100. Generator set; 200. Parallel switchgear; 300. Host computer controller; 110. First generator set; 111. Second generator set; 1. Parallel system output cabinet; 2. Parallel switchgear; 3. PT cabinet; 4. Main control cabinet; 7. Grounding resistor cabinet; 21. First diesel generator set; 22. First diesel generator set control system; 8. Second diesel generator set; 6. Universal parallel unit controller; 9. Parallel communication cable; 10. Monitoring communication cable; 11. Parallel busbar; 33. Unit parallel speed regulation and voltage regulation port open drive circuit; 34. Port open drive circuit control signal cable; 35. Host computer control panel. DETAILED DESCRIPTION

[0024] It should be noted that, in the absence of conflict, the embodiments and features of the embodiments in this application can be combined with each other. The present application will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0025] In order to enable those skilled in the art to better understand the present invention, the following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments in the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts should fall within the scope of protection of this application.

[0026] It should be noted that the terms "first", "second", etc. in the specification and claims of the present application and the above-mentioned drawings are used to distinguish similar objects and are not necessarily used to describe a specific order or sequential order. It should be understood that the data used in this way can be interchanged where appropriate, so that the embodiments of the present application described here. In addition, the terms "including" and "having" and any of their variations are intended to cover non-exclusive inclusions. For example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0027] As introduced in the background technology, most generator sets in the existing technology have independent control systems, and their parallel communication protocols are different, making it difficult to carry out effective parallel connection. In order to solve the problem that there is a lack of technical solutions to achieve effective parallel connection of different generator sets in the existing technology, the embodiments of the present application provide a generator set parallel control system and a generator set parallel control method.

[0028] The technical solutions in the embodiments of the present invention will be described clearly and completely below with reference to the accompanying drawings in the embodiments of the present invention.

[0029] Figure 1 This is a schematic diagram of a generator set parallel control system according to an embodiment of the present application, see Figure 1, the generator set parallel control system 01 includes multiple generator sets 100 in parallel, parallel switch cabinets 200 and host computer controllers 300. The control systems and communication protocols of at least two generator sets in the multiple generator sets 100 in parallel are different. The two generator sets include a first generator set 110 and a second generator set 111. The first generator set 110 is equipped with a dedicated control system. The parallel speed and voltage regulating port of the dedicated control system is in an open state or a non-fully open state. The second generator set 111 is equipped with a universal parallel set controller that runs in parallel with the first generator set; the parallel switch cabinet 200 is connected to each of the above generator sets 100 for performing synchronous closing operations; the host computer controller 300 communicates with the dedicated control system of the first generator set 110 and the universal parallel set controller of the second generator set 111 respectively. The device is connected to the controller 300 for controlling the parallel operation of the first generator set 110 and the second generator set 111 by adopting a preset strategy, wherein the preset strategy includes: when the parallel speed regulation and voltage regulation port of the first generator set 110 is in the open state, the upper computer controller 300 takes over the speed regulation and voltage regulation function, and controls the parallel switch cabinet 200 to be synchronously closed to realize parallel operation; when the parallel speed regulation and voltage regulation port of the first generator set 110 is in the non-fully open state, the upper computer controller 300 activates the port opening drive circuit to drive the first generator set 110 to open the parallel speed regulation and voltage regulation port, and takes over the speed regulation and voltage regulation function, and controls the parallel switch cabinet 200 to be synchronously closed to realize parallel operation.

[0030] Specifically, a generator set parallel control system includes multiple generator sets connected in parallel, at least two of which have different control systems and communication protocols. This diversity stems from the mixed use of different generator sets in practical applications. There are at least two generator sets: a first generator set and a second generator set. The first generator set is equipped with a dedicated control system that allows parallel operation, but its parallel speed and voltage control ports may be open or partially open. The second generator set is equipped with a universal paralleling unit controller for parallel operation with the first generator set. This controller ensures compatibility even if the two have different control systems and communication protocols. Parallel switchgear connects the generator sets and is responsible for performing synchronous closing operations, thereby enabling parallel operation. Parallel switchgear is a key electrical device in parallel operation, ensuring that all generator sets operate under the same voltage, frequency, and phase angle conditions when connected in parallel. The host controller communicates with the dedicated control system of the first generator set and the universal paralleling unit controller of the second generator set, respectively, and coordinates parallel operation using a preset strategy.

[0031] When the parallel speed and voltage regulation ports of the first generator set are open, the host controller directly takes over the speed and voltage regulation functions, adjusts the operating parameters of each generator set, ensures that the parallel conditions are consistent, and then controls the parallel switchgear to close synchronously, achieving parallel operation. If the parallel speed and voltage regulation ports of the first generator set are not fully open (i.e., partially restricted or closed), the host controller first activates the port opening drive circuit, prompting the first generator set to open its parallel speed and voltage regulation ports. Once the ports are open, the host controller takes over the speed and voltage regulation functions and then controls the parallel switchgear to close synchronously, ultimately achieving effective parallel operation of the generator sets.

[0032] This generator set parallel control system is designed to be highly flexible, adapting to parallel operation between generator sets with different control systems and communication protocols. This overcomes the limitations of traditional parallel control for generator sets with the same control system and communication protocol. Through the collaborative operation of the host controller and the universal paralleling unit controller, communication compatibility and parallel operation control are achieved for generator sets with different control systems and communication protocols, enhancing the stability and reliability of the emergency power supply system. The host controller adopts different control strategies based on the open status of specific generator set ports to ensure smooth parallel operation. Regardless of whether the ports are fully open, it can find the appropriate control solution to achieve the paralleling goal. Through intelligent coordination, the host controller can directly take over the speed and voltage regulation functions of the first generator set when its parallel speed and voltage regulation ports are open, enabling rapid synchronous closing and paralleling with the second generator set. If the ports are not fully open, the host controller activates the port open drive circuit to force the first generator set to open its parallel speed and voltage regulation ports, then take over the speed and voltage regulation functions, similarly achieving parallel operation with the second generator set. It not only overcomes the control barriers caused by incompatible communication protocols between different generator sets, but also ensures the consistency of voltage, frequency and phase angle under parallel operation conditions, thereby solving the problem of lack of technical solutions in the existing technology to achieve effective parallel connection of different generator sets.

[0033] In some embodiments of the present application, the host controller includes a speed and voltage regulation module for adjusting the PID parameters of the voltage and speed regulation units of each of the generator sets to match the voltage, frequency and phase angle conditions required for the parallel operation.

[0034] Specifically, the host controller includes a speed and voltage regulation module, specifically designed to adjust the PID parameters of the generator set's voltage and speed regulation units. This ensures that all generator sets meet uniform parallel conditions when operating in parallel, namely, consistent voltage, frequency, and phase angle. PID parameters refer to the proportional (P), integral (I), and differential (D) control parameters, which are used in the closed-loop control algorithms of speed and voltage regulation units (such as the automatic voltage regulator (AVR) and the engine auxiliary speed regulator (GOV). By adjusting these parameters, the dynamic response and steady-state performance of the generator sets can be optimized, enabling smoother and more stable adjustment of voltage, frequency, and phase angle during parallel operation to meet parallel requirements. Parallel operation requires that the voltage, frequency, and phase angle of the generator sets be as consistent as possible. Otherwise, current surges will occur at the moment of synchronous closing, affecting the stability and efficiency of the power system. The speed and voltage regulation module enables the host controller to proactively adjust the PID parameters of each generator set to align the characteristics of their voltage and speed regulation units, thereby ensuring that parallel conditions are met.

[0035] The automated adjustment capabilities of the speed and voltage regulation module significantly improve the adaptability and compatibility of the generator set parallel control system for generator sets with different control systems and communication protocols. This means that even if the generator sets have different control systems and communication protocols, and different basic PID settings, they can still be effectively paralleled through the intervention of the host controller, without the need for manual adjustments or reliance on the original compatibility between the generator sets. By precisely adjusting the PID parameters to ensure the consistency of parallel conditions, the speed and voltage regulation module helps reduce transient fluctuations in the power system and avoid common problems in parallel operation, such as excessive current surges and uneven power distribution, thereby improving the stability and reliability of the entire parallel system.

[0036] By integrating the speed and voltage regulation module into the host controller, dynamic adjustment of the PID parameters of the generator set's voltage and speed regulation unit is achieved, ensuring that the generator sets participating in parallel operation can quickly and accurately match the voltage, frequency, and phase angle conditions required for parallel operation. This not only overcomes the paralleling difficulties caused by differences in control systems and communication protocols in traditional parallel systems, but also greatly improves the efficiency of parallel operation and the stability of the power system. The introduction of the speed and voltage regulation module enables the system to intelligently respond to changes in the external environment and dynamic adjustments to parallel conditions, thereby avoiding common problems such as current surges and uneven power distribution. It provides a safer and more controllable emergency power guarantee for critical infrastructure such as data centers and communication hubs, and also provides a technical basis for the mutual backup and flexible replacement of generator sets with different control systems and communication protocols.

[0037] In some embodiments of the present application, the above-mentioned generator set parallel control system also includes a parallel communication interface, which is composed of a communication cable between the above-mentioned host computer controller and each of the above-mentioned generator set controllers, and the above-mentioned communication cable is provided with impedance-matching terminal resistors at the head and tail units.

[0038] Specifically, the parallel communication interface primarily consists of communication cables between the host controller and each generator set controller. These cables form a multi-node network, allowing the host controller to exchange information with all generator set controllers. In this parallel communication network, particular emphasis is placed on the installation of impedance-matching termination resistors at the communication cables between the first and last generator sets. Typically, the termination resistors have a resistance of 120 ohms. The primary function of the termination resistors is to provide impedance matching, which is crucial for maintaining signal integrity and preventing signal reflections, especially over long communication cables. Installing termination resistors at both ends of a bus-type network reduces reflections during signal transmission, avoids data transmission errors, and ensures stable and reliable communication. In a multi-node network, signal reflections and delays are more complex. The proper use of termination resistors can significantly improve this situation, ensuring that the host controller can accurately and promptly communicate with each generator set controller and coordinate the entire parallel operation process.

[0039] The parallel communication interface enables the host controller to collect real-time status information from each generator set, including voltage, frequency, and phase angle, and transmit control commands such as speed and voltage regulation, as well as closing and opening commands, ensuring unified control of all generator sets during parallel operation. Through the host controller, even if the communication protocols of different generator sets differ, accurate information can be transmitted through the parallel communication interface. This enhances communication compatibility between generator sets with different control systems and communication protocols, thus supporting parallel operation. The appropriate setting of the terminal resistor optimizes signal quality in the communication network, reduces interference and loss during data transmission, and further enhances the stability and efficiency of the parallel control system. In summary, the design of the parallel communication interface and terminal resistors in the generator set parallel control system not only strengthens internal communication capabilities but also effectively resolves the issue of communication protocol incompatibility when generator sets with different control systems and communication protocols are operating in parallel, providing solid technical support for the efficient paralleling of generator sets with different control systems and communication protocols.

[0040] In some embodiments of the present application, the port opening drive circuit includes an intermediate relay for transmitting a control signal to activate the speed and voltage regulation function of the dedicated control system of the first generator set.

[0041] Specifically, the port-opening drive circuit addresses the parallel control challenges faced by the first generator set's parallel speed and voltage regulation ports when they are not fully open. As an auxiliary circuit, the port-opening drive circuit drives the first generator set's dedicated control system to open its parallel speed and voltage regulation functions, allowing the host controller to take over and implement speed and voltage regulation control. The intermediate relay serves as a signal transmission mechanism within the system, receiving the port-opening control signal from the host controller, amplifying it, and transmitting it to the speed and voltage regulation module of the first generator set's dedicated control system. Upon receiving the control signal, the intermediate relay activates the first generator set's parallel speed and voltage regulation functions. Signal transmission from the drive circuit prompts the relevant ports in the dedicated control system to open, facilitating subsequent speed and voltage regulation control. The intermediate relay also provides a layer of safety isolation, preventing risks associated with direct interaction between the host controller and the generator set's control system, such as overvoltage and overcurrent, and protecting the generator set's control system from direct impact from external signals.

[0042] The use of open-port drive circuits and intermediate relays overcomes the limitations of the generator set's parallel speed and voltage regulation ports. This allows the host controller to activate and take over the generator set's speed and voltage regulation functions through appropriate control strategies, even when the ports are not fully open or closed. This enables effective parallel operation of generator sets with different control systems and communication protocols. This design improves the system's compatibility with generator sets with different control systems and communication protocols, simplifies the parallel control strategy, and ensures that parallel operation between generator sets can be achieved even in the face of technical barriers and system incompatibilities, enhancing the system's flexibility and reliability. Through signal transmission and amplification via the intermediate relay, the host controller can more precisely control the parallel speed and voltage regulation functions of the first generator set, avoiding the signal attenuation or distortion that may result from direct control, further improving the accuracy and efficiency of parallel control.

[0043] In some embodiments of the present application, the parallel switch cabinet includes a circuit breaker for performing synchronous closing and opening operations according to instructions from the host controller.

[0044] Specifically, parallel switchgear includes circuit breakers, which are primarily designed to control the closing and opening of circuits in the power system and to rapidly disconnect circuits in the event of a fault, protecting the system. When the host controller determines, through its preset strategy, that all generator sets meet the conditions for parallel operation—that is, that the voltage, frequency, and phase angle are aligned—it sends a closing command to the circuit breaker in the parallel switchgear. Upon receiving the command, the circuit breaker immediately performs a synchronous closing operation, connecting the generator sets to the parallel circuit, thereby enabling parallel operation of multiple generator sets. Similarly, when parallel operation needs to be stopped or a system fault or abnormality is detected, the host controller sends an opening command to the circuit breaker. Upon receiving the command, the circuit breaker rapidly performs an opening operation, disconnecting the generator sets from the parallel circuit, achieving safe and controllable disconnection or system protection.

[0045] Circuit breakers can operate automatically according to instructions from the host controller, eliminating the need for human intervention. This improves system response speed and operational efficiency while also reducing potential errors caused by manual operation. Precise control of the circuit breaker ensures a smooth transition between generator sets during parallel connection, avoiding current surges and circulating currents, thereby maintaining stable operation of the power system and mitigating the risk of system collapse. Automatic tripping of the circuit breaker upon fault detection quickly isolates the faulty generator set, preventing the spread of the fault and protecting the safety of the entire power system. In summary, the circuit breaker in the parallel switchgear serves as the actuator in the generator set parallel control system. Its synchronized closing and opening operations, performed according to instructions from the host controller, are a key step in implementing the parallel control strategy. The circuit breaker's automated control features not only improve the convenience and efficiency of system operation but also ensure the stability and safety of the power system.

[0046] In some embodiments of the present application, the above-mentioned host computer controller has a built-in virtual bus voltage control system. When the above-mentioned parallel speed regulation and voltage regulation port of the above-mentioned first generator set is in the above-mentioned non-fully open state, the above-mentioned virtual bus voltage control system is used to generate a virtual bus signal to drive the above-mentioned dedicated control system of the above-mentioned first generator set to open the above-mentioned parallel speed regulation and voltage regulation port.

[0047] Specifically, during the parallel control process of generator sets, if the parallel speed and voltage regulation ports of the first generator set are not fully open, the virtual bus voltage control system built into the host controller will generate virtual bus voltage and frequency signals. These virtual bus signals simulate the operating status of the actual bus and play a vital role for generator set-specific control systems that need to detect bus voltage and frequency to enable parallel speed and voltage regulation functions before parallel operation. The virtual bus signals are designed to be in the form of signals that can be recognized and responded to by the dedicated control system of the first generator set. When the dedicated control system receives these virtual signals, it will assume that the actual bus is ready, and will automatically open the parallel speed and voltage regulation ports, allowing the host controller to take over this function for speed and voltage control.

[0048] The above demonstrates the application of a virtual bus voltage control system when the paralleling speed and voltage regulation ports are not fully accessible. This means that even if a generator set's control ports are not fully accessible to direct control by the host controller, parallel operation conditions can still be achieved through the intervention of the virtual bus voltage control system. When a generator set's paralleling speed and voltage regulation ports are not fully accessible due to initial settings or other technical protections, the virtual bus voltage control system provides a mechanism to circumvent these restrictions, enabling the host controller to indirectly control the paralleling speed and voltage regulation functions. This breaks down technical barriers and enables effective parallel operation of generator sets with different control systems and communication protocols. The introduction of the virtual bus voltage control system significantly enhances the compatibility and flexibility of the generator set paralleling control system. It not only addresses the access restrictions of the paralleling speed and voltage regulation ports but also coordinates the parallel operation of generator sets with different control systems and communication protocols, improving the adaptability and stability of the entire system. By generating virtual bus signals to drive the access of the paralleling speed and voltage regulation ports, the virtual bus voltage control system reduces manual intervention during the paralleling process, optimizes the operational process of the paralleling system, and improves the efficiency and safety of parallel operation. For those generator sets whose parallel speed and voltage regulation ports are not fully open, the virtual bus voltage control system enables these generator sets to effectively communicate and parallel control with the host controller and other sets, promoting parallel operation between generator sets with different control systems and communication protocols.

[0049] In other embodiments of the present application, a virtual bus signal synchronization mechanism is introduced. By integrating a virtual signal generation module into the host controller, the bus voltage and frequency signals are simulated, enabling synchronized closing and parallel operation between generator sets. The specific steps are as follows: When the parallel communication cable cannot directly obtain the bus voltage and frequency signals, the host controller analyzes the operating status of each generator set and generates a virtual bus signal that simulates the actual electrical characteristics of the parallel busbar. The host controller distributes the virtual bus signal to each generator set via the parallel communication cable, ensuring that all generator sets receive the same synchronization signal, enabling synchronized closing during the parallel operation. Using the virtual bus signal, the host controller can more accurately detect the speed and voltage regulation characteristics of each generator set and issue more precise speed and voltage regulation commands, bringing the output capabilities of each generator set closer together and reducing current surges and power fluctuations during the parallel operation. Virtual bus technology bypasses the physical limitations of the generator control system, enabling synchronized parallel operation with generator sets of other brands even if the parallel ports are not fully open, greatly enhancing the device compatibility and operational stability of the parallel system.

[0050] The virtual bus signal synchronization mechanism enables parallel operation of units even with partially open GOV and AVR control ports. By distributing virtual signals, different units can operate according to a unified synchronization signal, enhancing the system's adaptability and flexibility for diverse unit combinations. The virtual bus signal synchronization mechanism ensures synchronous closing of all units during the paralleling process, reducing the risk of parallel current surges and system crashes, and improving the overall safety and reliability of the parallel system.

[0051] The embodiment of the present application also provides a generator set parallel control method, which is applicable to any of the above generator set parallel control systems, such as Figure 2 As shown, the above-mentioned generator set parallel control method includes the following steps:

[0052] Step S201, determining whether the parallel speed and voltage regulating port of the first generator set is in an open state or a partially open state;

[0053] Specifically, accurately determining the status of the first generator set's parallel speed and voltage regulation ports is one of the fundamental conditions for achieving parallel operation. Determining whether the first generator set's parallel speed and voltage regulation ports are in an open or partially open state effectively verifies whether the parallel control system is ready to support parallel operation of the first generator set with the other generator sets. Specifically, when the parallel speed and voltage regulation ports are in the open state, this means the control system of the first generator set allows the host controller to directly access and control its speed and voltage regulation functions. In this state, the host controller can directly send speed and voltage regulation commands via the communication interface, and the control system of the first generator set will respond by adjusting the operating status of the units to meet the parallel conditions. A partially open state means that the parallel speed and voltage regulation ports are subject to certain restrictions, preventing the host controller from directly accessing or controlling the speed and voltage regulation functions unless a specific signal is received. In this state, the control system of the first generator set requires additional stimulation or signals to open the corresponding ports, allowing the host controller to take over and perform speed and voltage regulation control.

[0054] The host controller first attempts to obtain the current status of the parallel speed and voltage control ports through the communication interface with the first generator set. This is usually achieved by querying specific parameters in the communication protocol or using the control system's self-test function. Based on the received signal or returned status code, the host controller determines whether the parallel speed and voltage control ports are in an open state. If the port is open, it indicates that the first generator set is ready for parallel control. If the port is not open, it is necessary to further determine whether it is in a partially open state. To determine if it is in a partially open state, the host controller attempts to send a specific request signal or control command and observe the unit's response. If the unit opens the speed and voltage control ports after receiving the signal, it is confirmed that it is in a partially open state. If the unit does not respond or the response is not as expected, other types of restrictions or faults may exist.

[0055] This judgment step ensures intelligent operation of the parallel control system, enabling flexible adaptation to varying technical conditions. It also provides the necessary conditional judgment and preparation mechanism for the parallel operation of generator sets with different control systems and communication protocols. This judgment automatically identifies and resolves technical obstacles that may be encountered during the paralleling process, thereby improving the success rate of the paralleling process and the operational efficiency of the entire system. This provides strong support for power supply security and emergency backup capabilities in scenarios such as data centers and communication hubs.

[0056] Step S202: If the parallel speed and voltage regulation port of the first generator set is in the open state, the upper controller is controlled to take over the speed and voltage regulation function, and the parallel switch cabinet is controlled to perform a synchronous closing operation to achieve parallel operation between the first generator set and the second generator set;

[0057] Specifically, when the parallel speed and voltage regulation port of the first generator set is open, indicating that the generator set's control system allows direct communication and control with the host controller, the following control flow can be executed to achieve parallel operation between the first and second generator sets. With the parallel speed and voltage regulation port open, the host controller can directly access the first generator set's control system and take over its speed and voltage regulation functions. This means that the host controller replaces the original generator set's dedicated control system and becomes the primary unit for controlling and adjusting the generator set's voltage, frequency, and phase angle. Based on the requirements of parallel operation, the host controller adjusts the generator set's speed and voltage regulation parameters to ensure consistency or near consistency with the voltage, frequency, and phase angle of the second generator set. This process includes adjusting the parameters of the PID (Proportional-Integral-Derivative) controller to ensure matching speed and voltage regulation performance. The host controller coordinates the speed and voltage regulation functions of the first and second generator sets, enabling them to operate synchronously and share the load according to the set power distribution ratio, ensuring stability and efficiency of parallel operation.

[0058] After the speed and voltage regulation functions are taken over and the parameters are adjusted, the host controller checks whether the voltage, frequency, and phase angle of the first and second generator sets meet the parallel connection conditions. Once these conditions are met, the host controller sends a synchronous closing signal to the parallel switchgear. Upon receiving the closing command from the host controller, the parallel switchgear executes the synchronous closing operation, closing the parallel circuit breaker at the correct time to connect the first generator set to the circuit in parallel with the second generator set. After the synchronous closing is successful, the first and second generator sets begin operating in parallel, jointly supplying power to the power system. Through the coordinated control of the host controller, stable power quality and balanced power distribution are ensured.

[0059] After the host controller takes over the speed and voltage regulation functions, it simplifies the complexity of parallel operations, reduces human intervention, and improves the automation level of the paralleling process. Through unified coordination by the host controller, the speed and voltage regulation of the generator sets can be more precisely controlled, thereby improving the efficiency and stability of parallel operation, reducing power losses and unnecessary competition between units. Synchronous closing operations ensure the safety of the paralleling process, preventing current surges and circulating currents, and avoiding the risk of unit overload disconnection and system crashes. With the parallel speed and voltage regulation ports of the first generator set open, the host controller takes over the speed and voltage regulation functions and controls the paralleling switchgear for synchronous closing, enabling safe and efficient parallel operation of the generator sets. This process fully utilizes the coordinated control capabilities of the host controller, simplifies parallel operation, and improves the stability and safety of parallel operation.

[0060] Step S203: If the parallel speed and voltage regulation port of the first generator set is in the non-fully open state, control the upper controller to activate the port opening drive circuit to drive the first generator set to open the parallel speed and voltage regulation port, and control the upper controller to take over the speed and voltage regulation function, and control the parallel switch cabinet to close synchronously to realize parallel operation between the first generator set and the second generator set.

[0061] Specifically, when the parallel speed and voltage regulation ports of the first generator set are in a partially open state, this means that the generator set's control system will not automatically or directly respond to control requests from the host controller. In this situation, achieving parallel operation of the generator sets requires an additional activation mechanism to force the parallel speed and voltage regulation ports to open. Generator set speed and voltage regulation ports in a partially open state require a specific drive signal to activate their opening mechanism. Upon detecting this state, the host controller activates the port opening drive circuit. This circuit is designed to generate and transmit an activation signal, prompting the control system of the first generator set to open the parallel speed and voltage regulation ports. The port opening drive circuit includes an intermediate relay or other similar signal amplification and conversion device. These devices receive commands from the host controller, amplify the signals, and convert them into a format recognizable by the dedicated control system. The converted signals are then transmitted to the generator set's control system to activate the parallel speed and voltage regulation ports.

[0062] Once the parallel speed and voltage regulation ports for the first generator set are activated and open, the host controller takes over the speed and voltage regulation functions, effectively taking control from the first generator set's dedicated control system and directly controlling the speed and voltage regulation of the units. Based on the requirements of parallel operation, the host controller adjusts the speed and voltage regulation parameters of the first generator set to ensure consistency or near consistency with the voltage, frequency, and phase angle of the second generator set. This process involves adjusting the PID control parameters to match the speed and voltage regulation characteristics of the second generator set. After taking over the speed and voltage regulation functions, the host controller coordinates the operations of the first and second generator sets to ensure the stability and efficiency of the parallel operation, including power distribution, load balancing, and power quality control.

[0063] After the speed and voltage regulation parameters of the first generator set are aligned with those of the second, the host controller generates a synchronous closing signal to ensure that both generator sets can be connected to the parallel circuit simultaneously or at an appropriate time. Following the host controller's instructions, the circuit breakers in the parallel switchgear perform a synchronous closing operation, closing the parallel circuit breaker at a precisely calculated moment, connecting the first and second generator sets in parallel and supplying power to the power system together. After successful synchronous closing, the first and second generator sets begin operating in parallel, with the host controller coordinating their operating states to ensure the stability and safety of the power system.

[0064] In a partially open state, by activating the port-opening drive circuit, the host controller can overcome the limitations of the original control system on parallel speed and voltage regulation, achieving direct control of the first generator set and promoting effective parallel operation of generator sets with different control systems and communication protocols. This process allows for parallel operation of generator sets with different control systems and communication protocols, even if the generator set control system is relatively closed, through coordination between the external drive circuit and the host controller, thereby enhancing the system's compatibility and flexibility. Through the host controller's control and parameter adjustment, the stability and coordination of the first and second generator sets during parallel operation can be ensured, reducing power quality issues caused by mismatched speed and voltage regulation characteristics.

[0065] When the parallel speed and voltage regulation ports of the first generator set are not fully open, the host controller activates the port opening drive circuit to open the parallel speed and voltage regulation ports, taking over the speed and voltage regulation functions and controlling the parallel switchgear to perform synchronous closing operations, enabling parallel operation between the first and second generator sets. This process overcomes technical barriers, enhances the system's compatibility with generator sets using different control systems and communication protocols, and improves the stability and efficiency of parallel operation, which is of great significance for power security in scenarios such as power emergency backup systems and data centers.

[0066] By determining the open status of the first generator set's parallel speed and voltage control ports, the system achieves effective parallel control of generator sets under different technical conditions. When the ports are open, the upper-level controller directly takes over the speed and voltage control functions, precisely controlling the parallel switchgear for synchronous closing. This ensures seamless parallel operation of the first and second generator sets, improving the efficiency of the paralleling process and the stability of the power system. When the ports are not fully open, the port-opening drive circuit is activated, driving the first generator set to open its parallel speed and voltage control ports. The upper-level controller then takes over control, similarly achieving synchronous closing and parallel operation, thus resolving the parallel operation challenges caused by technical barriers. This method not only overcomes the limitations of parallel control of generator sets with different control systems and communication protocols, enhancing system compatibility and control flexibility, but also significantly improves the safety and power quality of parallel operation. This provides a more reliable and stable emergency power guarantee for critical infrastructure such as data centers and communication hubs, thereby addressing the lack of a technical solution for effectively paralleling generator sets with different control systems and communication protocols in the existing technology.

[0067] During the specific implementation process, if the parallel speed and voltage regulation port of the above-mentioned first generator set is in the above-mentioned open state, the upper controller is controlled to take over the speed and voltage regulation function, including: if the parallel speed and voltage regulation port of the above-mentioned first generator set is in the above-mentioned open state, the actual voltage, frequency and phase angle of the parallel bus are detected, and compared with the output voltage, frequency and phase angle of the above-mentioned first generator set to determine the initial deviation of speed and voltage regulation; according to the above-mentioned initial deviation, the PID parameters of the speed and voltage regulation unit of the above-mentioned first generator set are adjusted until the voltage, frequency and phase angle of the above-mentioned first generator set and the above-mentioned second generator set are within the preset range.

[0068] Specifically, when the parallel speed and voltage regulation ports of the first generator set are open, the upper-level controller first detects the actual voltage, frequency, and phase angle on the parallel busbar. These parameters reflect the operating status of the existing parallel system or power grid and serve as important reference indicators before parallel operation. The upper-level controller compares the detected parallel busbar parameters with the voltage, frequency, and phase angle output by the first generator set to determine the difference, which is the initial deviation for speed and voltage regulation. This initial deviation reflects the gap between the current operating status of the first generator set and the requirements of the parallel system.

[0069] Based on the detected initial deviation, the upper-level controller adjusts the PID (Proportional-Integral-Derivative) controller parameters of the first generator set's speed and voltage regulation unit. The PID parameter adjustment aims to reduce the deviation, gradually bringing the first generator set's output voltage, frequency, and phase angle closer to the actual parameters of the parallel busbar until both are within a preset range. PID parameter adjustment is a dynamic process. Based on the changes in the deviation, the upper-level controller continuously optimizes the PID parameters until the first generator set's output parameters and the parallel busbar parameters meet the preset matching criteria. This means that the differences in voltage, frequency, and phase angle are within the allowable error range, thus creating conditions for parallel operation.

[0070] Through precise deviation detection and PID parameter adjustment, the operating state of the first generator set before paralleling is optimized, ensuring that its voltage, frequency, and phase angle match those of the second generator set, laying the foundation for parallel operation. The adjusted PID parameters effectively control the speed and voltage regulation units of the first generator set, minimizing current surges and uneven power distribution during the paralleling process, thereby improving the stability and safety of parallel operation. Through coordinated control by the upper-level controller, the first generator set can quickly adjust to the optimal state before paralleling, reducing time delays during the paralleling process and improving the response speed and overall efficiency of the paralleling system. In short, with the first generator set's parallel speed and voltage regulation ports open, PID parameters are detected and adjusted to ensure that the first generator set's output parameters match the parallel busbar parameters within the preset matching range, creating favorable conditions for parallel operation between the first and second generator sets. This not only optimizes the generator set's pre-parallel readiness but also enhances the stability and efficiency of parallel operation, providing a reliable emergency power backup solution for critical scenarios such as data centers and communication hubs.

[0071] In some embodiments of the present application, if the parallel speed regulation and voltage regulation port of the above-mentioned first generator set is in the above-mentioned non-fully open state, the above-mentioned upper controller is controlled to activate the port opening drive circuit to drive the above-mentioned first generator set to open the above-mentioned parallel speed regulation and voltage regulation port, including: if the above-mentioned parallel speed regulation and voltage regulation port of the above-mentioned first generator set is in the above-mentioned non-fully open state, a port opening request signal is sent to the dedicated control system of the above-mentioned first generator set, requesting to open the above-mentioned parallel speed regulation and voltage regulation port of the above-mentioned first generator set; if the above-mentioned dedicated control system responds and allows the above-mentioned parallel speed regulation and voltage regulation port of the above-mentioned first generator set to be opened, the above-mentioned upper controller is controlled to activate the above-mentioned port opening drive circuit to generate a corresponding control signal; the above-mentioned control signal is transmitted to the above-mentioned first generator set to drive the above-mentioned first generator set to open the above-mentioned parallel speed regulation and voltage regulation port.

[0072] Specifically, when the dedicated control system detects that the parallel speed and voltage regulation port of the first generator set is not fully open, it sends a port opening request signal to the dedicated control system of the first generator set. This request signal typically contains a specific communication protocol or control code that conforms to the dedicated control system's input format. The purpose of the request is to inform the dedicated control system of the first generator set that the host controller needs to access and control the parallel speed and voltage regulation port of this generator set to achieve parallel operation with the second generator set. After receiving the port opening request, the dedicated control system determines whether to allow the parallel speed and voltage regulation port to be opened based on preset rules or conditions. This determination involves safety checks, operating status assessments, and confirmation of other technical conditions. If the dedicated control system determines that the current conditions meet the port opening requirements, it generates a permission signal to notify the host controller that the parallel speed and voltage regulation port can be activated. After the dedicated control system allows the parallel speed and voltage regulation port to be opened, the host controller activates the port opening drive circuit. This circuit contains the necessary electronic components and control modules, such as intermediate relays, to generate and transmit drive signals. The port opening drive circuit generates the corresponding control signal based on the instructions from the host controller. These signals are customized based on the needs of the dedicated control system and the characteristics of the generator sets to ensure effective activation of the parallel speed and voltage regulation ports. The upper-level controller transmits the generated control signals to the parallel speed and voltage regulation ports of the first generator set via a communication link or hardwired connection. Upon receiving the control signals, the first generator set's parallel speed and voltage regulation ports are activated, allowing them to be directly accessed and controlled by the upper-level controller. This ensures the necessary conditions for subsequent takeover of the speed and voltage regulation functions and the synchronized closing of the parallel switchgear.

[0073] This process solves the problem of parallel control when the parallel speed and voltage regulation port of the first generator set is not fully open. By sending a request through the upper controller, activating the drive circuit, and transmitting the control signal, it is possible to break through technical barriers and achieve effective parallel operation between generator sets with different control systems and communication protocols. This not only improves the compatibility and operational efficiency of the system, but also enhances the safety of the parallel process and the stability of the power system. In short, in a non-fully open state, through the interaction between the upper controller and the dedicated control system, the port opening drive circuit is activated, and the parallel speed and voltage regulation port is successfully opened, providing key technical support for the parallel operation of generator sets with different control systems and communication protocols.

[0074] Furthermore, after adjusting the PID parameters of the speed and voltage regulating unit of the first generator set according to the initial deviation until the voltage, frequency and phase angle of the first generator set and the second generator set are within a preset range, the method further includes: using a parallel communication interface to transmit the adjusted PID parameters to the controllers of the first generator set and the second generator set to update the control parameters of the speed and voltage regulating units of each generator set.

[0075] Specifically, after the upper controller takes over the speed and voltage regulation functions and completes PID parameter adjustment, the speed and voltage regulation characteristics of the first generator set are within the preset matching range with the actual voltage, frequency, and phase angle of the parallel busbar. This means that after adjustment, the first generator set can operate stably in parallel with the parallel system or the second generator set. The parallel communication interface is the channel for data exchange between generator sets and between a generator set and the upper controller. It supports multiple communication protocols, such as 485 serial communication, Ethernet communication, or CAN bus communication, to meet the communication requirements of generator sets with different control systems and communication protocols. The upper controller uses the parallel communication interface to transmit the adjusted PID parameters to the controllers of the first and second generator sets. This process ensures accurate parameter transmission, allowing each generator set to receive the latest control parameters in a timely manner. After receiving the PID parameters transmitted by the upper controller, the generator set controller updates the control parameters of its internal speed and voltage regulation unit to ensure consistency with the adjusted parameters. This update process is a key step in adapting each generator set to parallel operation, ensuring that each unit maintains the same speed and voltage regulation performance when in parallel, thereby achieving balanced power distribution and stable system operation.

[0076] Transmitting the adjusted PID parameters through the parallel communication interface can enhance the control consistency between the generator sets, ensure the matching of voltage, frequency and phase angle during parallel operation, reduce current shock and uneven power distribution during the parallel process, and improve the stability and safety of parallel operation. The updated PID parameters optimize the speed and voltage regulation characteristics of the generator sets during parallel operation, help improve the response speed and power output quality of the parallel system, and provide better power guarantee for key scenarios such as data centers and communication hubs. The use of the parallel communication interface overcomes the communication barriers between generator sets with different control systems and communication protocols, improves the compatibility and scalability of the system, and enables efficient and stable parameter coordination when units with different control systems and communication protocols are operated in parallel.

[0077] In other embodiments of the present application, an intelligent adaptive PID parameter adjustment algorithm is introduced. This algorithm can automatically detect changes in the voltage, frequency, and phase angle of the parallel busbar and adjust the PID parameters of each generator set in real time based on these changes. The specific steps are as follows: Real-time monitoring of parallel busbar parameters: The host computer controller continuously monitors the voltage, frequency, and phase angle of the parallel busbar to obtain the real-time operating status of the parallel system. Based on the monitored parameters, the algorithm automatically adjusts the PID parameters of each generator set's speed and voltage regulation unit. The purpose of this adjustment is to minimize current surges during the paralleling process, ensure balanced power distribution between units, and maintain stable system operation. The algorithm establishes a closed-loop feedback system, sending the adjusted PID parameters to each generator set controller via parallel communication cables. It also receives and analyzes unit operating data, continuously optimizing the parameters until the ideal parallel operating state is achieved. The algorithm also has intelligent optimization capabilities, capable of predicting potential failures or unstable conditions and automatically adjusting PID parameters before problems occur, thereby preventing unit overload and system failure.

[0078] The dynamic response capability of the parallel system is enhanced by the introduction of an intelligent adaptive PID parameter adjustment algorithm. This algorithm can quickly respond to even the slightest changes in the parallel system parameters and maintain stable power output. Real-time PID parameter adjustments ensure that each generator set carries the load in proportion to its rated power, avoiding efficiency losses caused by uneven power distribution. The algorithm's closed-loop control and intelligent optimization capabilities predict and prevent failures, ensuring stable operation of the parallel system even under adverse operating conditions.

[0079] In order to enable those skilled in the art to more clearly understand the technical solution of the present application, the implementation process of the generator set parallel control method of the present application will be described in detail below with reference to specific embodiments.

[0080] This embodiment relates to a specific generator set parallel control method, including two generator set parallel control strategies, which are described as follows:

[0081] The first parallel control strategy utilizes a dedicated control system with open parallel ports. This type of generator set has a dedicated unit control and functional control system. While the parallel speed and voltage control ports for the engine and generator are open, parallel communication between the unit control systems is impossible due to the incompatibility of the parallel communication protocol with other systems.

[0082] The control strategy is: add a parallel control panel to the original unit as the host computer, and its unit controller is the same as the controller of other units to be connected in parallel. The newly added host computer takes over the parallel speed regulation and voltage regulation functions of the original unit and the synchronous closing and opening control of the parallel switch cabinet; and realizes parallel communication between different units through the host computer controller. In this way, on the basis of ensuring the control performance of the original unit, voltage, frequency and phase angle detection and parallel synchronous adjustment are carried out (different units adjust their analog speed regulation and voltage regulation unit PID respectively, so that the characteristics of their parallel speed regulation and voltage regulation units are close to the same); the control of the group to be connected in parallel is made to distribute the active and reactive load proportionally with the original unit, as well as the parallel functions such as synchronous load transfer, so as to realize the effective parallel operation of the two generator sets. This technical strategy overcomes the industry problem of system incompatibility among different generator sets and the inability to communicate and control in parallel; through the host computer, a speed regulation and voltage regulation control system that takes over the original unit is developed, breaking through the communication limitation; and realizing the parallel connection of different units. See Figure 3 , parallel system output cabinet 1, parallel switch cabinet 2, PT cabinet 3, main control cabinet 4 (centralized control cabinet), grounding resistance cabinet 7, first diesel generator set 21, first diesel generator set control system 22, second diesel generator set 8, universal parallel set controller 6, parallel communication cable 9, monitoring communication cable 10, parallel busbar 11. Figure 3 A system diagram of two second diesel generator sets and two first diesel generator sets in parallel is shown; the first diesel generator set control system 22 has its parallel speed regulation and voltage regulation ports open to the outside.

[0083] The two first diesel generator sets 21 have independent unit control and systems and are the original configuration units. The two second diesel generator sets 8 are newly added units. The second diesel generator sets 8 use a universal parallel unit controller 6. To achieve the operation of the newly added units and the original units, the specific plan is as follows:

[0084] The control system for the first diesel generator set 21 was changed from parallel mode to stand-alone mode, with manual closing and opening permissions enabled. A universal controller was added as the host computer for the first generator set control system. Through wiring, it took over the parallel analog speed and voltage regulation signals of the first diesel generator set control system 22. It also took over the closing and opening control of the synchronous switchgear of the first generator set control system (this meant disconnecting the wiring harness from the original generator set control system to the engine and generator auxiliary speed regulation and voltage regulation, replacing the wiring to the host computer controller; disconnecting the original generator set control system from the parallel switchgear synchronous closing and opening, replacing the wiring to the host computer controller; and disconnecting the original generator set start signal from the host computer controller (either hardwired or monitoring communication cable). The host computer controllers of the two first diesel generator sets 21 communicated with the newly added second diesel generator set 8 via a 485 communication cable. A 120-ohm resistor was added to each end of the communication cable between the first and last generator sets for impedance matching, ensuring good communication between the units.

[0085] Through the above line connection and settings, communication, synchronous detection, synchronous closing and opening control, and operation control among the four units can be achieved; the speed and voltage regulation characteristics of the units with two different control systems and communication protocols are matched through the speed and voltage regulation PID adjustment link of the universal controller; thereby realizing the operation of the four units.

[0086] The second parallel control strategy: using a dedicated control system, whose parallel speed and voltage regulation ports are not fully open, and the parallel control technology of units with different control systems and communication protocols. Its GOV and AVR parallel speed and voltage regulation ports are not open before the parallel synchronous closing. The solution is to install a higher-level parallel control panel on the original unit, whose unit controller is the same as the controller of other units to be paralleled, and take over the parallel speed and voltage regulation ports and control functions of the original unit; at the same time, add a parallel port drive control circuit to drive the original unit to open the GOV and AVR parallel regulation ports, thereby realizing parallel detection, synchronous closing and synchronous control functions between units, and realizing the effective parallel operation of multi-brand generator sets. Figure 4 , parallel system output cabinet 1, parallel switch cabinet 2, PT cabinet 3, main control cabinet 4 (centralized control cabinet), grounding resistor cabinet 7, first diesel generator set 21, first diesel generator set control system 22, first diesel generator set control system 22, second diesel generator set 8, universal parallel unit controller 6, unit parallel speed regulation and voltage regulation port open drive circuit 33, port open drive circuit control signal cable 34, upper computer control panel 35, parallel communication cable 9, monitoring communication cable 10, parallel busbar 11. Figure 4 The diagram shows a system with two second diesel generator sets connected in parallel with two first diesel generator sets. The parallel speed control and voltage regulation ports of the first diesel generator set control system 22 are not fully open. The parallel speed control and voltage regulation ports of the first diesel generator set control system 22 are open.

[0087] The two second diesel generator sets are for capacity expansion and parallel connection, enabling four units to be connected in parallel. They utilize a universal parallel unit controller 6; the control systems for the two first diesel generator sets utilize the universal parallel unit controller 6 as the host controller. The host control panel 35 of the first diesel generator set 21 incorporates the universal parallel unit controller 6 and also integrates a port development driver circuit.

[0088] The control system of the first diesel generator set 21 is changed from parallel mode to single-machine mode, and manual closing and opening permission is enabled; a universal parallel set controller 6 is added as the host computer of the first diesel generator set control system, which takes over the parallel analog speed regulation and voltage regulation signals of the first diesel generator set 21 control system through line connection; takes over the closing and opening control of the synchronous switch cabinet of the first diesel generator set control system (that is, disconnecting the original set control system to the engine and generator auxiliary speed regulation and voltage regulation wiring harness, and replacing the wiring to the host controller; disconnecting the original set control system to the parallel switch cabinet synchronous closing and opening, and replacing the wiring to the host controller; disconnecting the original set start signal to the host controller - hard wire or monitoring communication cable).

[0089] The control system of the first diesel generator set is changed from parallel mode to stand-alone mode, and manual closing and opening permission is enabled; the added host computer control panel integrates the universal parallel set controller and the port development drive circuit, serving as the host computer of the first diesel generator set control system. Through line connection, it takes over the parallel analog speed regulation and voltage regulation signals of the first diesel generator set control system; takes over the closing and opening control of the synchronous switch cabinet of the first diesel generator set control system (that is, disconnect the original unit control system to the engine and generator auxiliary speed regulation and voltage regulation wiring harness, and replace the wiring to the host computer controller; disconnect the original unit control system to the parallel switch cabinet synchronous closing and opening, and replace the wiring to the host computer controller; disconnect the original unit start signal to the host computer controller - hard wire or monitoring communication cable).

[0090] like Figure 4 As shown, after the unit obtains the parallel start instruction, the first diesel generator set 21 is started, the unit voltage and frequency are effective, and after reaching the rated value, the unit parallel speed regulation and voltage regulation port opening drive circuit 33 feeds the unit voltage and frequency signal back to the original unit bus input port through the intermediate relay as a parallel virtual bus voltage and frequency signal virtual signal, driving the original unit to open the parallel speed regulation and voltage regulation analog adjustment port. At this time, the upper computer controller performs parallel speed regulation, voltage regulation signal detection and PID adjustment of the original unit according to the voltage and frequency detected by the actual parallel busbar 11; the universal parallel unit controller 6 issues a synchronous closing command when detecting that the first diesel generator set 21 is synchronized with the busbar (if the first diesel generator set first reaches the load closing condition, the upper computer controller first controls the parallel switch cabinet 2 to close and supply power; the other units are synchronized in parallel with it); then the units with different control systems and communication protocols adjust their speed regulation and voltage regulation unit PIDs respectively to match the characteristics of their speed regulation and voltage regulation units, thereby realizing synchronous parallel connection and parallel operation control between the group to be paralleled and the original unit, and realizing effective parallel and stable operation of two or more generator sets with different control systems and communication protocols.

[0091] By installing a host computer, we developed a technology that takes over the original generator's speed and voltage regulation, as well as a parallel control system, overcoming communication limitations and enabling the parallel connection of units with different control systems and communication protocols. For units with dedicated parallel control systems but different control systems and communication protocols, and whose engine and generator control units have incompletely open parallel GOV and AVR parallel adjustment ports, we developed a virtual bus voltage control system. This system uses analog signals to drive the original generator's GOV and AVR ports to open, overcoming port limitations and circumventing communication restrictions, enabling the parallel connection of units with different control systems and communication protocols.

[0092] The embodiments of the present application also provide a generator set parallel control device. It should be noted that the generator set parallel control device of the embodiments of the present application can be used to execute the generator set parallel control method provided by the embodiments of the present application. The device is used to implement the above-mentioned embodiments and preferred implementation methods, and the details that have been explained will not be repeated here. As used below, the term "module" can be a combination of software and / or hardware that implements a predetermined function. Although the devices described in the following embodiments are preferably implemented in software, implementation in hardware, or a combination of software and hardware, is also possible and conceivable.

[0093] The following is an introduction to the generator set parallel control device provided in the embodiment of the present application.

[0094] Figure 5 FIG is a block diagram of a parallel control device for generator sets according to an embodiment of the present application. Figure 5 As shown, the device includes a judgment unit 501, a first control unit 502, and a second control unit 503. The judgment unit is used to judge whether the parallel speed and voltage regulation port of the first generator set is in an open state or a non-fully open state; the first control unit is used to control the upper controller to take over the speed and voltage regulation function if the parallel speed and voltage regulation port of the first generator set is in the open state, and control the parallel switch cabinet to perform a synchronous closing operation to achieve parallel operation between the first generator set and the second generator set; the second control unit is used to control the upper controller to activate the port opening drive circuit to drive the first generator set to open the parallel speed and voltage regulation port if the parallel speed and voltage regulation port of the first generator set is in the non-fully open state, control the upper controller to take over the speed and voltage regulation function, and control the parallel switch cabinet to perform a synchronous closing operation to achieve parallel operation between the first generator set and the second generator set.

[0095] By determining the open status of the first generator set's parallel speed and voltage control ports, the system achieves effective parallel control of generator sets under different technical conditions. When the ports are open, the upper-level controller directly takes over the speed and voltage control functions, precisely controlling the parallel switchgear for synchronous closing. This ensures seamless parallel operation of the first and second generator sets, improving the efficiency of the paralleling process and the stability of the power system. When the ports are not fully open, the port-opening drive circuit is activated, driving the first generator set to open its parallel speed and voltage control ports. The upper-level controller then takes over control, similarly achieving synchronous closing and parallel operation, thus resolving the parallel operation challenges caused by technical barriers. This method not only overcomes the limitations of parallel control of generator sets with different control systems and communication protocols, enhancing system compatibility and control flexibility, but also significantly improves the safety and power quality of parallel operation. This provides a more reliable and stable emergency power guarantee for critical infrastructure such as data centers and communication hubs, thereby addressing the lack of a technical solution for effectively paralleling generator sets with different control systems and communication protocols in the existing technology.

[0096] In a specific implementation process, the first control unit includes a detection module and an adjustment module. The detection module is used to detect the actual voltage, frequency, and phase angle of the parallel busbar when the parallel speed and voltage regulation port of the first generator set is in the open state, and compare it with the output voltage, frequency, and phase angle of the first generator set to determine the initial deviation of speed and voltage regulation. The adjustment module is used to adjust the PID parameters of the speed and voltage regulation unit of the first generator set according to the initial deviation until the voltage, frequency, and phase angle of the first and second generator sets are within a preset range.

[0097] Through precise deviation detection and PID parameter adjustment, the operating state of the first generator set before paralleling is optimized, ensuring that its voltage, frequency, and phase angle match those of the second generator set, laying the foundation for parallel operation. The adjusted PID parameters effectively control the speed and voltage regulation units of the first generator set, minimizing current surges and uneven power distribution during the paralleling process, thereby improving the stability and safety of parallel operation. Through coordinated control by the upper-level controller, the first generator set can quickly adjust to the optimal state before paralleling, reducing time delays during the paralleling process and improving the response speed and overall efficiency of the paralleling system. In short, with the first generator set's parallel speed and voltage regulation ports open, PID parameters are detected and adjusted to ensure that the first generator set's output parameters match the parallel busbar parameters within the preset matching range, creating favorable conditions for parallel operation between the first and second generator sets. This not only optimizes the generator set's pre-parallel readiness but also enhances the stability and efficiency of parallel operation, providing a reliable emergency power backup solution for critical scenarios such as data centers and communication hubs.

[0098] In some embodiments of the present application, the second control unit includes a sending module, a generating module, and a driving module. The sending module is configured to send a port opening request signal to the dedicated control system of the first generator set to request opening of the parallel speed and voltage regulating port of the first generator set if the parallel speed and voltage regulating port of the first generator set is in the non-fully open state; the generating module is configured to control the upper controller to activate the port opening driving circuit and generate a corresponding control signal if the dedicated control system responds and allows opening of the parallel speed and voltage regulating port of the first generator set; and the driving module is configured to transmit the control signal to the first generator set to drive the first generator set to open the parallel speed and voltage regulating port.

[0099] The above solves the problem of parallel control when the parallel speed and voltage regulation port of the first generator set is in a non-fully open state. By sending a request, activating the drive circuit and transmitting the control signal through the upper controller, it is possible to break through technical barriers and realize effective parallel operation between generator sets with different control systems and communication protocols. Not only does it improve the compatibility and operating efficiency of the system, it also enhances the safety of the parallel process and the stability of the power system. In short, in a non-fully open state, through the interaction between the upper controller and the dedicated control system, the port opening drive circuit is activated and the parallel speed and voltage regulation port is successfully opened, providing key technical support for the parallel operation of generator sets with different control systems and communication protocols.

[0100] Furthermore, the above-mentioned device also includes an updating unit for adjusting the PID parameters of the speed and voltage regulating unit of the above-mentioned first generator set according to the above-mentioned initial deviation until the voltage, frequency and phase angle of the above-mentioned first generator set and the above-mentioned second generator set are within a preset range, and then using a parallel communication interface to transmit the adjusted PID parameters to the controllers of the above-mentioned first generator set and the above-mentioned second generator set to update the control parameters of the above-mentioned speed and voltage regulating units of each generator set.

[0101] Transmitting the adjusted PID parameters through the parallel communication interface can enhance the control consistency between the generator sets, ensure the matching of voltage, frequency and phase angle during parallel operation, reduce current shock and uneven power distribution during the parallel process, and improve the stability and safety of parallel operation. The updated PID parameters optimize the speed and voltage regulation characteristics of the generator sets during parallel operation, help improve the response speed and power output quality of the parallel system, and provide better power guarantee for key scenarios such as data centers and communication hubs. The use of the parallel communication interface overcomes the communication barriers between generator sets with different control systems and communication protocols, improves the compatibility and scalability of the system, and enables efficient and stable parameter coordination when units with different control systems and communication protocols are operated in parallel.

[0102] The generator set parallel control device includes a processor and memory. The judgment unit, first control unit, second control unit, etc. are stored as program units in the memory. The processor executes the program units stored in the memory to implement the corresponding functions. The modules are all located in the same processor; alternatively, the modules can be located in different processors in any combination.

[0103] The memory may include non-permanent memory in a computer-readable medium, random access memory (RAM) and / or non-volatile memory, such as read-only memory (ROM) or flash RAM, and the memory includes at least one memory chip.

[0104] An embodiment of the present invention provides a computer-readable storage medium, which includes a stored program. When the program is executed, the device where the computer-readable storage medium is located is controlled to execute the generator set parallel control method.

[0105] An embodiment of the present invention provides a processor, which is used to run a program, wherein the program executes the generator set parallel control method when running.

[0106] An embodiment of the present invention provides an electronic device comprising a processor, a memory, and a program stored in the memory and executable on the processor. When the processor executes the program, the steps of the above-described method for controlling parallel connection of generator sets are implemented. The device herein may be a server, a PC, a PAD, a mobile phone, or the like.

[0107] The present application also provides a computer program product, which, when executed on a data processing device, is suitable for executing a program that initializes the steps of the above-mentioned generator set parallel control method.

[0108] Obviously, those skilled in the art will appreciate that the various modules or steps of the present invention described above can be implemented using a general-purpose computing device, can be centralized on a single computing device, or can be distributed across a network of multiple computing devices. They can be implemented using program code executable by the computing device, and thus, can be stored in a storage device and executed by the computing device. In some cases, the steps shown or described herein can be performed in a different order than that shown, or can be fabricated as separate integrated circuit modules, or multiple modules or steps can be fabricated as a single integrated circuit module. Thus, the present invention is not limited to any particular combination of hardware and software.

[0109] Those skilled in the art will appreciate that the embodiments of the present application may be provided as methods, systems, or computer program products. Therefore, the present application may take the form of an entirely hardware embodiment, an entirely software embodiment, or an embodiment combining software and hardware. Furthermore, the present application may take the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to magnetic disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code.

[0110] The present application is described with reference to the flowcharts and / or block diagrams of the methods, devices (systems), and computer program products according to the embodiments of the present application. It should be understood that each process and / or block in the flowchart and / or block diagram, as well as the combination of processes and / or blocks in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing device to produce a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the processes in the flowchart and / or block diagram. Figure 1 a process or multiple processes and / or boxes Figure 1 A device that provides the functions specified in a block or multiple blocks.

[0111] These computer program instructions may also be stored in a computer readable memory that can direct a computer or other programmable data processing device to work in a specific manner, so that the instructions stored in the computer readable memory produce an article of manufacture comprising an instruction device, which implements the process Figure 1 a process or multiple processes and / or boxes Figure 1 The function specified in one or more boxes.

[0112] These computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operational steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing the instructions executed on the computer or other programmable device for implementing the process. Figure 1 a process or multiple processes and / or boxes Figure 1 A step that specifies a function in one or more boxes.

[0113] In a typical configuration, a computing device includes one or more processors (CPUs), input / output interfaces, network interfaces, and memory.

[0114] The memory may include non-permanent memory in a computer-readable medium, random access memory (RAM) and / or non-volatile memory in the form of read-only memory (ROM) or flash RAM. The memory is an example of a computer-readable medium.

[0115] Computer-readable media includes both permanent and non-permanent, removable and non-removable media that can be implemented using any method or technology for information storage. Information can be computer-readable instructions, data structures, program modules, or other data. Examples of computer storage media include, but are not limited to, phase-change RAM (PRAM), static random access memory (SRAM), dynamic random access memory (DRAM), other types of random access memory (RAM), read-only memory (ROM), electrically erasable programmable read-only memory (EEPROM), flash memory or other memory technologies, compact disc read-only memory (CD-ROM), digital versatile disc (DVD) or other optical storage, magnetic cassettes, magnetic disk storage or other magnetic storage devices, or any other non-transmission media that can be used to store information that can be accessed by a computing device. As defined herein, computer-readable media does not include transitory computer-readable media, such as modulated data signals and carrier waves.

[0116] The technical features of the above-mentioned embodiments can be combined arbitrarily. In order to make the description concise, not all possible combinations of the technical features in the above-mentioned embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0117] It should also be noted that the terms "comprises," "includes," or any other variations thereof are intended to encompass non-exclusive inclusion, such that a process, method, commodity, or apparatus that includes a series of elements includes not only those elements but also other elements not explicitly listed, or includes elements inherent to such process, method, commodity, or apparatus. In the absence of further limitations, an element defined by the phrase "comprises a ..." does not exclude the presence of other identical elements in the process, method, commodity, or apparatus that includes the element.

[0118] The above description is merely a preferred embodiment of the present application and is not intended to limit the present application. Various modifications and variations are possible for those skilled in the art. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present application shall be included within the scope of protection of the present application.

Claims

1. A generator set parallel control system, characterized in that: include: Multiple generator sets connected in parallel, at least two of which have different control systems and communication protocols, the two generator sets comprising a first generator set and a second generator set, the first generator set being equipped with a dedicated control system, the parallel speed and voltage regulating ports of the dedicated control system being in an open state or a partially open state, and the second generator set being equipped with a universal parallel set controller operating in parallel with the first generator set; A parallel switch cabinet, connected to each of the generator sets, for performing a synchronous closing operation; a host computer controller, the host computer controller being in communication with the dedicated control system of the first generator set and the universal parallel unit controller of the second generator set, and being configured to control the parallel operation of the first generator set and the second generator set using a preset strategy; Among them, the preset strategy includes: when the parallel speed regulation and voltage regulation port of the first generator set is in the open state, the upper computer controller takes over the speed regulation and voltage regulation function, and controls the parallel switch cabinet to close synchronously to achieve parallel operation; when the parallel speed regulation and voltage regulation port of the first generator set is in the non-fully open state, the upper computer controller activates the port opening drive circuit to drive the first generator set to open the parallel speed regulation and voltage regulation port, and takes over the speed regulation and voltage regulation function, and controls the parallel switch cabinet to close synchronously to achieve parallel operation.

2. The generator set parallel control system according to claim 1, characterized in that: The host computer controller includes a speed and voltage regulation module for adjusting the PID parameters of the voltage and speed regulation units of each of the generator sets to match the voltage, frequency and phase angle conditions required for the parallel operation.

3. The generator set parallel control system according to claim 1, characterized in that: The generator set parallel control system also includes a parallel communication interface, which is composed of a communication cable between the host computer controller and each of the generator set controllers. The communication cable is provided with impedance-matching terminal resistors at the head and tail units.

4. The generator set parallel control system according to claim 1, characterized in that: The port opening drive circuit includes an intermediate relay for transmitting a control signal to activate the speed and voltage regulation function of the dedicated control system of the first generator set.

5. The generator set parallel control system according to claim 1, characterized in that: The parallel switch cabinet includes a circuit breaker, which is used to perform synchronous closing and opening operations according to the instructions of the host controller.

6. The generator set parallel control system according to claim 1, characterized in that: The host computer controller has a built-in virtual bus voltage control system. When the parallel speed and voltage regulation port of the first generator set is in the non-fully open state, the virtual bus voltage control system is used to generate a virtual bus signal to drive the dedicated control system of the first generator set to open the parallel speed and voltage regulation port.

7. A method for controlling parallel connection of generator sets, characterized in that: The generator set parallel control method is used for the generator set parallel control system according to any one of claims 1 to 6, and the generator set parallel control method includes: Determine whether the parallel speed and voltage regulating port of the first generator set is in an open state or a partially open state; If the parallel speed and voltage regulation port of the first generator set is in the open state, control the upper controller to take over the speed and voltage regulation function, and control the parallel switch cabinet to perform a synchronous closing operation to achieve parallel operation between the first generator set and the second generator set; If the parallel speed and voltage regulation port of the first generator set is in the non-fully open state, the upper controller is controlled to activate the port opening drive circuit to drive the first generator set to open the parallel speed and voltage regulation port, and the upper controller is controlled to take over the speed and voltage regulation function, and the parallel switch cabinet is controlled to close synchronously to realize parallel operation between the first generator set and the second generator set.

8. The method according to claim 7, characterized in that If the parallel speed and voltage regulation port of the first generator set is in the open state, controlling the upper controller to take over the speed and voltage regulation function includes: If the parallel speed and voltage regulation port of the first generator set is in the open state, detecting the actual voltage, frequency and phase angle of the parallel busbar, and comparing them with the output voltage, frequency and phase angle of the first generator set to determine the initial deviation of speed and voltage regulation; According to the initial deviation, the PID parameters of the speed and voltage regulating unit of the first generator set are adjusted until the voltage, frequency and phase angle of the first generator set and the second generator set are within a preset range.

9. The method according to claim 7, characterized in that If the parallel speed and voltage regulation port of the first generator set is in the non-fully open state, controlling the upper controller to activate the port opening drive circuit to drive the first generator set to open the parallel speed and voltage regulation port includes: If the parallel speed and voltage regulating port of the first generator set is in the non-fully open state, sending a port opening request signal to the dedicated control system of the first generator set to request opening the parallel speed and voltage regulating port of the first generator set; If the dedicated control system responds and allows the parallel speed and voltage regulating port of the first generator set to be opened, the upper controller is controlled to activate the port opening drive circuit to generate a corresponding control signal; The control signal is transmitted to the first generator set to drive the first generator set to open the parallel speed and voltage regulation port.

10. The method according to claim 8, characterized in that After adjusting the PID parameters of the speed and voltage regulating unit of the first generator set according to the initial deviation until the voltage, frequency, and phase angle of the first generator set and the second generator set are within a preset range, the method further includes: The adjusted PID parameters are transmitted to the controllers of the first generator set and the second generator set using a parallel communication interface to update the control parameters of the speed and voltage regulating units of each generator set.

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