Generator set parallel control system and generator set parallel control method

Abstract

The application 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 multiple generator sets in parallel, a parallel switch cabinet and an upper computer controller. The control systems and communication protocols of at least two generator sets are different. The two generator sets comprise a first generator set and a second generator set. The first generator set is equipped with a special control system, and the second generator set is equipped with a general parallel unit controller for parallel operation with the first generator set. The parallel switch cabinet is connected with each generator set and is used for performing a synchronous closing operation. The upper computer controller is in communication connection with the special control system of the first generator set and the general parallel unit controller of the second generator set respectively, and is used for controlling the parallel operation of the first generator set and the second generator set by adopting a preset strategy. The scheme solves the problem that there is no technical scheme for effectively parallelizing different generator sets in the prior art.

Description

TECHNICAL FIELD

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

[0002] Under the background of digital economy, data centers and communication hubs increasingly rely on high-power emergency power supplies, and usually adopt different high-power diesel generator sets for parallel operation to provide stable and reliable power supply. However, due to incompatible control systems and ineffective communication, different brands of generator sets cannot be effectively synchronized and power distributed, which not only limits the flexibility and emergency response capability of the power system, but also poses risks of parallel failure, unit overload, and even system collapse. Especially in the case of unstable supply chain, single type of unit configuration may affect the normal operation of data centers due to supply crisis.

[0003] In the prior art, most generator sets have independent control systems, and their parallel communication protocols are different, making it difficult to effectively parallel. This technical barrier and supply chain limitation makes data centers have to continue to rely on the same type of generator set when expanding or updating the generator set, increasing the operating cost and reducing the system safety and supply chain controllability. There is a lack of technical solutions in the prior art to achieve effective parallel of generator sets with different control systems and communication protocols. SUMMARY

[0004] The main purpose of the present application is to provide a generator set parallel control system and a generator set parallel control method to at least solve the problem of lack of technical solutions in the prior art to achieve effective parallel 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 in parallel, control systems and communication protocols of at least two generator sets being different, the two generator sets comprising a first generator set and a second generator set, the first generator set being equipped with a special control system, a parallel speed and voltage regulating port of the special control system being in an open state or a non-fully open state, the second generator set being equipped with a general parallel unit controller for parallel operation with the first generator set; a parallel switch cabinet connected with each of the generator sets, for performing a synchronous closing operation; and an upper computer controller, the upper computer controller being communicatively connected with the special control system of the first generator set and the general parallel unit controller of the second generator set respectively, for controlling parallel operation of the first generator set and the second generator set by using a preset strategy, wherein the preset strategy comprises: when the parallel speed and voltage regulating port of the first generator set is in the open state, the upper computer controller takes over the speed and voltage regulating function and controls the parallel switch cabinet to be synchronously closed to realize parallel operation; and when the parallel speed and voltage regulating port of the first generator set is in the non-fully open state, the upper computer controller activates a port open driving circuit to drive the first generator set to open the parallel speed and voltage regulating port and takes over the speed and voltage regulating function, and controls the parallel switch cabinet to be synchronously closed to realize parallel operation.

[0006] Optionally, the upper computer controller comprises a speed and voltage regulating module for adjusting PID parameters of a voltage and speed regulating unit of each of the generator sets to match voltage, frequency and phase angle conditions required by the parallel operation.

[0007] Optionally, the generator set parallel control system further comprises a parallel communication interface, the parallel communication interface being composed of a communication cable between the upper computer controller and each of the generator set controllers, and the communication cable being provided with an impedance-matched terminal resistor at a head and tail generator set.

[0008] Optionally, the port open driving circuit comprises an intermediate relay for transmitting a control signal to activate the speed and voltage regulating function of the special control system of the first generator set.

[0009] Optionally, the parallel switch cabinet comprises a circuit breaker for performing synchronous closing and opening operations according to an instruction of the upper computer controller.

[0010] Optionally, the upper computer controller is built-in with a virtual bus voltage control system, the virtual bus voltage control system being used to generate a virtual bus signal to drive the special control system of the first generator set to open the parallel speed and voltage regulating port when the parallel speed and voltage regulating port of the first generator set is in the non-fully open state.

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

[0012] Optionally, if the parallel speed and voltage regulating port of the first generator set is in the open state, controlling the upper controller to take over the speed and voltage regulating function comprises: if the parallel speed and voltage regulating port of the first generator set is in the open state, detecting the actual voltage, frequency and phase angle of the parallel bus, and comparing them with the output voltage, frequency and phase angle of the first generator set to determine the initial deviation of the speed and voltage regulating; and according to the initial deviation, adjusting the PID parameters of the speed and voltage regulating unit of the first generator set 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 and voltage regulating port of the first generator set is in the non-fully open state, controlling the upper controller to activate the port opening driving circuit to drive the first generator set to open the parallel speed and voltage regulating port comprises: 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 opening the parallel speed and voltage regulating port of the first generator set, then controlling the upper controller to activate the port opening driving circuit to generate a corresponding control signal; and transmitting the control signal to the first generator set to drive the first generator set to open the parallel speed and voltage regulating port.

[0014] Optionally, after adjusting the PID parameters of the speed-regulating 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 the preset range, the method further comprises: transmitting the adjusted PID parameters to the controllers of the first generator set and the second generator set using the parallel communication interface to update the control parameters of the speed-regulating and voltage-regulating unit of each generator set.

[0015] With the technical solution of the present application, the generator set parallel control system comprises multiple generator sets in parallel, a parallel switch cabinet and an upper computer controller. The control systems and communication protocols of at least two generator sets are different. The two generator sets comprise a first generator set and a second generator set. The first generator set is equipped with a special control system. The parallel speed-regulating and voltage-regulating port of the special control system is in an open state or a non-completely open state. The second generator set is equipped with a general parallel set controller for parallel operation with the first generator set. The parallel switch cabinet is connected with each generator set and is used to perform a synchronous closing operation. The upper computer controller is in communication connection with the special control system of the first generator set and the general parallel set controller of the second generator set, respectively, and is used to control the parallel operation of the first generator set and the second generator set by using a preset strategy. The preset strategy comprises: when the parallel speed-regulating and voltage-regulating port of the first generator set is in an open state, the upper computer controller takes over the speed-regulating and voltage-regulating function and controls the parallel switch cabinet to perform a synchronous closing operation to realize parallel operation; and when the parallel speed-regulating and voltage-regulating port of the first generator set is in a non-completely open state, the upper computer controller activates a port open driving circuit to drive the first generator set to open the parallel speed-regulating and voltage-regulating port and takes over the speed-regulating and voltage-regulating function, and controls the parallel switch cabinet to perform a synchronous closing operation to realize parallel operation. In this solution, through the intelligent coordination of the upper computer controller, the speed-regulating and voltage-regulating function of the first generator set can be directly taken over when the parallel speed-regulating and voltage-regulating port of the first generator set is open, so that the first generator set and the second generator set can be quickly and synchronously closed and connected in parallel. When the port is in a non-completely open state, the speed-regulating and voltage-regulating function of the first generator set is taken over by activating the port open driving circuit to drive the first generator set to open the parallel speed-regulating and voltage-regulating port. The same parallel operation with the second generator set is achieved. Not only is the control obstacle caused by the incompatible communication protocols between different generator sets overcome, but also the consistency of the voltage, frequency and phase angle under parallel operation is ensured, so that the problem of lacking a technical solution to effectively parallel different generator sets in the prior art is solved. BRIEF DESCRIPTION OF DRAWINGS

[0016] The accompanying drawings, which form a part of the present application, are intended to provide further understanding of the present application and are incorporated herein for a purpose of explanations and are not intended as an undue limitation of the application. In the drawings:

[0017] Figure 1A structure diagram of a generator set parallel control system provided by an embodiment of the application is shown.

[0018] Figure 2 A flow diagram of a generator set parallel control method provided by an embodiment of the application is shown.

[0019] Figure 3 A first 2-second diesel generator set and 2-first diesel generator set parallel system diagram is shown.

[0020] Figure 4 A second 2-second diesel generator set and 2-first diesel generator set parallel system diagram is shown.

[0021] Figure 5 A structure block diagram of a generator set parallel control device provided by an embodiment of the application is shown.

[0022] Among the above drawings, the following reference signs are included:

[0023] 01, generator set parallel control system; 100, generator set; 200, parallel switch cabinet; 300, upper computer controller; 110, first generator set; 111, second generator set; 1, parallel system output cabinet; 2, parallel switch cabinet; 3, PT cabinet; 4, main control cabinet; 7, grounding resistance cabinet; 21, first diesel generator set; 22, first diesel generator set control system; 8, second diesel generator set; 6, general parallel unit controller; 9, parallel communication cable; 10, monitoring communication cable; 11, parallel busbar; 33, unit parallel speed regulation, voltage regulation port opening drive circuit; 34, port opening drive circuit control signal cable; 35, upper computer control screen. DETAILED DESCRIPTION

[0024] It should be noted that the embodiments and features in the embodiments in the application can be combined with each other without conflict. The technical solutions in the embodiments of the application will be described in detail below with reference to the drawings and in combination with the embodiments.

[0025] In order to enable persons skilled in the art to better understand the schemes of the present application, the technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by persons skilled in the art without creative labor should belong to the scope of protection of the present application.

[0026] It should be noted that the terms "first", "second", etc. in the specification and claims of the present application and in the above drawings are used to distinguish similar objects, and do not necessarily have to be used to describe a specific order or sequence. It should be understood that the data thus used can be interchanged under appropriate circumstances, so that the embodiments of the present application described herein can be implemented. In addition, the terms "include" and "have" and any variations thereof are intended to cover non-exclusive inclusion, for example, a process, method, system, product or device that includes a series of steps or units does not have to be limited to those steps or units clearly listed, but can 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, most of the existing generator sets have independent control systems, and the communication protocols are different, which is difficult to effectively parallel. To solve the problem that there is no technical solution to realize effective parallel of different generator sets in the prior art, 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 application will be described clearly and completely in combination with the drawings in the embodiments of the present application.

[0029] Figure 1 is a structural schematic diagram of a generator set parallel control system provided in an embodiment of the present application, referring to Figure 1The generator set parallel control system 01 includes multiple generator sets 100 in parallel, a parallel switch cabinet 200, and an upper computer controller 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 special control system. The parallel speed and voltage regulating port of the special control system is in an open state or a non-fully open state. The second generator set 111 is equipped with a general parallel unit controller for parallel operation with the first generator set. The parallel switch cabinet 200 is connected with each of the generator sets 100 and is used to perform a synchronous closing operation. The upper computer controller 300 is in communication connection with the special control system of the first generator set 110 and the general parallel unit controller of the second generator set 111, respectively, and is used to control the parallel operation of the first generator set 110 and the second generator set 111 by using a preset strategy. The preset strategy includes that when the parallel speed and voltage regulating port of the first generator set 110 is in the open state, the upper computer controller 300 takes over the speed and voltage regulating function and controls the parallel switch cabinet 200 to perform synchronous closing to realize parallel operation. When the parallel speed and voltage regulating port of the first generator set 110 is in the non-fully open state, the upper computer controller 300 activates a port open driving circuit to drive the first generator set 110 to open the parallel speed and voltage regulating port and takes over the speed and voltage regulating function, and controls the parallel switch cabinet 200 to perform synchronous closing to realize parallel operation.

[0030] Specifically, the generator set parallel control system includes multiple generator sets in parallel, wherein the control systems and communication protocols of at least two generator sets are different. This diversity comes from the mixed use of different generator sets in actual applications. There are at least two generator sets, i.e., a first generator set and a second generator set. The first generator set is equipped with a special control system that allows parallel operation, but its parallel speed and voltage regulating port can be in an open state or a non-fully open state. The second generator set is equipped with a general parallel unit controller for parallel operation with the first generator set, which can achieve compatibility even if the control systems and communication protocols of the two are different. A parallel switch cabinet is connected with each generator set and is responsible for performing a synchronous closing operation, thereby realizing the parallel operation of the generator sets. The parallel switch cabinet is a key electrical equipment in parallel operation, which ensures that each generator set can operate under the same voltage, frequency, and phase angle conditions when in parallel. An upper computer controller is in communication with the special control system of the first generator set and the general parallel unit controller of the second generator set, respectively, and adopts a preset strategy to coordinate parallel operation.

[0031] When the parallel speed and voltage adjustment port of the first generator set is in an open state, the host computer controller directly takes over the speed and voltage adjustment function, adjusts the operating parameters of each generator set, ensures that the parallel conditions are consistent, and controls the parallel switch cabinet to be synchronously closed to realize parallel operation. If the parallel speed and voltage adjustment port of the first generator set is in a non-fully open state (i.e., partially restricted or closed), the host computer controller first activates the port opening drive circuit to prompt the first generator set to open its parallel speed and voltage adjustment port. Once the port is opened, the host computer controller takes over the speed and voltage adjustment function, then controls the parallel switch cabinet to be synchronously closed, and finally realizes effective parallel operation of the generator sets.

[0032] The generator set parallel control system is highly flexible in design and can adapt to the parallel operation of generator sets with different control systems and communication protocols, solving the limitations in traditional parallel control of generator sets with the same control system and communication protocol. Through the cooperative work of the host computer controller and the general parallel set controller, communication compatibility and parallel operation control of generator sets with different control systems and communication protocols are realized, enhancing the stability and reliability of the emergency power supply system. The host computer controller adopts different control strategies according to the open state of the specific port of the generator set to ensure the smooth progress of parallel operation. Whether the port is fully open or not, a suitable control scheme can be found to achieve parallelization. Through the intelligent coordination of the host computer controller, when the parallel speed and voltage adjustment port of the first generator set is open, it can directly take over its speed and voltage adjustment function to realize rapid synchronous closing and parallelization with the second generator set; 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 adjustment port, and then the speed and voltage adjustment function is taken over, also achieving parallel operation with the second generator set. Not only does it overcome the control obstacles caused by incompatible communication protocols between different generator sets, but it also ensures the consistency of voltage, frequency, and phase angle under parallel operation conditions, thus solving the problem of lacking technical solutions for effective parallelization of different generator sets in the prior art.

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

[0034] Specifically, the host computer controller includes a speed and voltage regulation module, which is a specially designed part for adjusting the PID parameters of the generator set voltage and speed regulation unit. The purpose is to ensure that all generator sets can meet the unified parallel conditions, that is, the consistency of voltage, frequency and phase angle, when operating in parallel. PID parameters refer to proportional (P), integral (I) and derivative (D) control parameters used in the closed-loop control algorithm of the speed and voltage regulation unit, such as automatic voltage regulator (AVR) and engine auxiliary governor (GOV). By adjusting these parameters, the dynamic response and steady-state performance of the generator set can be optimized, so that it can adjust the voltage, frequency and phase angle more smoothly and stably when operating in parallel, to meet the requirements of parallel conditions. Parallel operation requires the voltage, frequency and phase angle between generator sets to 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 presence of the speed and voltage regulation module enables the host computer controller to actively adjust the PID parameters of each generator set, so that their voltage and speed regulation unit characteristics match, thereby ensuring that the parallel conditions are met.

[0035] The automatic adjustment capability of the speed and voltage regulation module significantly improves the adaptability and compatibility of the generator set parallel control system to different control systems and communication protocols of generator sets. This means that even if the control systems and communication protocols of the generator sets are different and have different basic PID settings, through the intervention of the host computer controller, they can still effectively operate in parallel without manual adjustment or relying on the original compatibility between generator sets. By precisely adjusting the PID parameters to ensure the consistency of parallel conditions, the speed and voltage regulation module helps to 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] Through the integration of the speed and voltage regulation module in the host computer controller, dynamic adjustment of the PID parameters of the generator set 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. Not only does it overcome the parallel problems caused by differences in control systems and communication protocols in traditional parallel systems, but it 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 external environmental changes and dynamic adjustments of parallel conditions, thereby avoiding common problems such as current surges and uneven power distribution, providing safer and more controllable emergency power protection for critical infrastructure such as data centers and communication hubs, and also providing a technical foundation for generator sets with different control systems and communication protocols to serve as backups for each other and be replaced flexibly.

[0037] In some embodiments of the present application, the above-mentioned generator set parallel control system further comprises a parallel communication interface, which is composed of communication cables between the host computer controller and each generator set controller. The communication cables are provided with impedance-matched terminal resistors at the head and tail generator sets.

[0038] Specifically, the parallel communication interface is mainly composed of communication cables between the host computer controller and each generator set controller, which form a multi-node network allowing the host computer controller to exchange information with all generator set controllers. In this parallel communication network, it is particularly emphasized that impedance-matched terminal resistors are provided at the communication cables of the head and tail generator sets. Generally, the resistance value of the terminal resistor is 120 ohms. The main function of the terminal resistor is to provide impedance matching, which is crucial for maintaining signal integrity and preventing signal reflection, especially on long communication cables. Terminal resistors at both ends of the bus-type network can reduce signal reflection during transmission, avoid data transmission errors, and ensure the stability and reliability of communication. In a multi-node network, signal reflection and delay are more complex, and proper use of terminal resistors can significantly improve this situation, ensuring that the host computer controller can accurately and timely communicate with each generator set controller to coordinate the entire parallel operation process.

[0039] The parallel communication interface enables the host computer controller to collect real-time status information of each generator set, including voltage, frequency, phase angle, etc., and send control instructions such as speed and voltage adjustment commands, closing and opening commands, etc., ensuring unified control of all generator sets during parallel operation. Through the host computer controller, even if there are differences in communication protocols between different generator sets, accurate information transmission can be achieved through the parallel communication interface, enhancing the communication compatibility between generator sets with different control systems and communication protocols, thereby supporting parallel operation. The reasonable setting of terminal resistors optimizes the signal quality of the communication network, reduces interference and loss in 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 enhances the communication capability within the system, but also effectively solves the problem of incompatible communication protocols in the parallel operation of generator sets with different control systems and communication protocols, providing solid technical support for the efficient parallel operation 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 control signals to activate the speed and voltage adjustment function of the dedicated control system of the first generator set.

[0041] Specifically, the port opening driving circuit is designed to address the challenge of parallel control of the parallel speed and voltage regulation port of the first generator set in a non-fully open state. As an auxiliary circuit, the port opening driving circuit is used to drive the dedicated control system of the first generator set to open its parallel speed and voltage regulation function, so that the host computer controller can take over and control the speed and voltage regulation. The intermediate relay plays a role in signal transmission in the system, receives the port opening control signal sent by the host computer controller, and amplifies and transmits this signal to the speed and voltage regulation function module of the dedicated control system of the first generator set. When receiving the control signal, the intermediate relay activates the parallel speed and voltage regulation function of the first generator set, and through the signal transmission of the driving circuit, it promotes the opening of the related ports in the dedicated control system, creating conditions for subsequent speed and voltage regulation control. The intermediate relay also provides a layer of safety isolation, avoiding the risks that may be caused by the direct interaction between the host computer controller and the control system of the generator set, such as overvoltage and overcurrent, and protecting the control system of the generator set from direct impact of external signals.

[0042] The use of the port opening driving circuit and the intermediate relay breaks through the limitations of the parallel speed and voltage regulation port of the generator set, enabling the host computer controller to activate and take over the speed and voltage regulation function of the generator set through appropriate control strategies even in the case of incomplete port opening or closure, and achieving effective parallel operation of generator sets with different control systems and communication protocols. This design improves the compatibility of the system for generator sets with different control systems and communication protocols, simplifies the parallel control strategy, and ensures that even in the face of technical barriers and system incompatibility, parallel operation between generator sets can still be achieved, enhancing the flexibility and reliability of the system. Through the signal transmission and amplification of the intermediate relay, the host computer controller can more accurately control the parallel speed and voltage regulation function of the first generator set, avoiding signal attenuation or distortion that may be caused by direct control, and 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 the instructions of the host computer controller.

[0044] Specifically, the parallel switch cabinet includes circuit breakers, which are primarily designed to control the closing and opening of circuits in power systems and rapidly cut off circuits in case of faults to ensure system safety. When the upper machine controller determines through its preset strategy that all generator sets have met the parallel operation conditions, i.e., voltage, frequency, and phase angle are consistent, the upper machine controller will send a closing command to the circuit breakers in the parallel switch cabinet. Upon receiving the command, the circuit breakers immediately perform a synchronous closing operation, connecting the generator sets to the parallel circuit, thereby achieving parallel operation of multiple generator sets. Similarly, when parallel operation needs to be stopped or system faults or abnormal conditions are detected, the upper machine controller sends an opening command to the circuit breakers. Upon receiving the command, the circuit breakers quickly perform an opening operation, disconnecting the generator sets from the parallel circuit, achieving safe and controllable tripping or system protection.

[0045] The circuit breakers can automatically operate according to the instructions of the upper machine controller without human intervention, improving the response speed and operation efficiency of the system and reducing errors that may be caused by human operation. Through precise control of the circuit breakers, smooth transition of the generator sets during parallel operation can be ensured, avoiding current surges and circulating currents, thereby maintaining stable operation of the power system and avoiding the risk of system collapse. The automatic opening operation of the circuit breakers upon detection of a fault can quickly isolate the faulty generator set, preventing the spread of faults and protecting the safety of the entire power system. In summary, the circuit breakers of the parallel switch cabinet, as the actuator in the generator set parallel control system, perform synchronous closing and opening operations according to the instructions of the upper machine controller, which is a key step in implementing the parallel control strategy. The automated control characteristics of the circuit breakers 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 aforementioned upper machine controller is built-in with a virtual bus voltage control system, which 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 regulating port when the parallel speed and voltage regulating port of the first generator set is in the aforementioned non-fully open state.

[0047] Specifically, during the parallel operation control of the generator set, if the parallel speed and voltage regulating port of the first generator set is not fully open, the virtual bus voltage control system built-in the host computer controller will generate virtual bus voltage and frequency signals. These virtual bus signals simulate the operating state of the actual bus, and play a crucial role for those generator set control systems that need to detect the bus voltage and frequency before parallel operation to open the parallel speed and voltage regulating function. The virtual bus signals are designed to be in a signal form that can be recognized and responded by the dedicated control system of the first generator set. When the dedicated control system receives these virtual signals, it will consider that the actual bus is ready, and automatically open the parallel speed and voltage regulating port, allowing the host computer controller to take over this function for speed and voltage control.

[0048] The above is the application of the virtual bus voltage control system when the parallel speed and voltage regulating port is not fully open, which means that even if the control port of the generator set is not fully open for direct control by the host computer controller, through the intervention of the virtual bus voltage control system, the parallel operation condition can still be realized. When the parallel speed and voltage regulating port of the generator set is limited by initial setting or other technical protection and is not fully open, the virtual bus voltage control system provides a mechanism to bypass these limitations, allowing the host computer controller to indirectly control the parallel speed and voltage regulating function, breaking through the technical barriers and realizing the 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 parallel control system. Not only can it cope with the opening restrictions of the parallel speed and voltage regulating port, but also can coordinate 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 opening of the parallel speed and voltage regulating port, the virtual bus voltage control system reduces the manual intervention during parallel operation, optimizes the operation process of the parallel system, and improves the efficiency and safety of parallel operation. For those generator sets whose parallel speed and voltage regulating port is not fully open, the virtual bus voltage control system enables these generator sets to effectively communicate and control with the host computer controller and other units, promoting the parallel operation between generator sets with different control systems and communication protocols.

[0049] In some embodiments of the present application, a virtual bus signal synchronization mechanism is introduced. By integrating a virtual signal generation module in the host controller, the voltage and frequency signals of the bus are simulated to achieve synchronized closing and parallel operation among the units. The specific steps are as follows: when the bus voltage and frequency signals cannot be directly obtained through the parallel communication cable, the host controller generates a virtual bus signal by analyzing the operating state of each unit, which simulates the actual electrical characteristics of the parallel bus. The host controller distributes the virtual bus signal to each generator unit through the parallel communication cable to ensure that the synchronization signals received by all units are consistent, achieving synchronized closing during parallel operation. Through the virtual bus signal, the host controller can more accurately detect the speed and voltage regulation characteristics of each generator unit, and then issue more accurate speed and voltage regulation instructions to make the output capacity of each unit closer, reducing the current impact and power fluctuation during parallel operation. The virtual bus technology bypasses the physical limitations of the unit control system, enabling generator units with partially open parallel ports to achieve synchronized parallel operation with other brands of units, greatly enhancing the equipment compatibility and operational stability of the parallel system.

[0050] The virtual bus signal synchronization mechanism enables units with partially open parallel GOV and AVR regulation ports to participate in parallel operation. Through the distribution of virtual signals, different units can operate according to a unified synchronization signal, enhancing the adaptability and flexibility of the system when facing different combinations of units. The virtual bus signal synchronization mechanism ensures synchronized closing of each unit during parallel operation, reduces the risk of parallel current impact and system collapse, and improves the overall safety and reliability of the parallel system.

[0051] The embodiments of the present application also provide a generator unit parallel control method. The generator unit parallel control method is used in any of the above-mentioned generator unit parallel control systems, such as the one shown in Figure 2 The generator unit parallel control method includes the following steps:

[0052] Step S201: Determine whether the parallel speed and voltage regulation port of the first generator unit is in an open state or a non-completely open state.

[0053] Specifically, accurately determining the status of the parallel speed and voltage regulating port of the first generator set is one of the basic conditions for parallel operation. The process of determining whether the parallel speed and voltage regulating port of the first generator set is in an open state or a non-fully open state is actually detecting whether the parallel control system is ready to support the parallel operation of the first generator set with other generator sets. Specifically, when the parallel speed and voltage regulating port is in an open state, it means that the control system of the first generator set allows the host controller to directly access and control its speed and voltage regulating functions. In this state, the host controller can directly send speed and voltage regulating instructions through the communication interface, and the control system of the first generator set will respond to the instructions to adjust the operating state of the generator set to meet the parallel conditions. The non-fully open state means that the parallel speed and voltage regulating port is subject to certain restrictions and does not allow the host controller to directly access or control the speed and voltage regulating functions unless a specific signal is received. In this state, the control system of the first generator set needs additional incentives or signals to open the corresponding port so that the host controller can take over and control the speed and voltage regulation.

[0054] The host controller first attempts to obtain the current status of the parallel speed and voltage regulating port through the communication interface with the first generator set, which is usually achieved by querying specific parameters in the communication protocol or using the self-checking function of the control system. According to the received signal or returned status code, the host controller determines whether the parallel speed and voltage regulating port is 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, further judgment is needed to determine whether it is in a non-fully open state. For the judgment of the non-fully open state, the host controller will try to send a specific request signal or control command and observe the response of the generator set. If the generator set opens the speed and voltage regulating port after receiving the signal, it is confirmed that it is in a non-fully open state; if the generator set does not respond or the response is not as expected, there may be other types of restrictions or faults.

[0055] This judgment step ensures the intelligent operation of the parallel control system, which can flexibly adapt to different technical conditions and provides necessary condition judgment and preparation mechanism for the parallel operation of generator sets with different control systems and communication protocols. Through this judgment, technical obstacles that may be encountered in the parallel process can be automatically identified and solved, thereby improving the success rate of the parallel process and the operating efficiency of the entire system, providing strong support for the safety of power supply and emergency backup capability in scenarios such as data centers and communication hubs.

[0056] Step S202, if the parallel speed and voltage regulating port of the first generator set is in the open state, the host controller is controlled to take over the speed and voltage regulating function, and the parallel switch cabinet is controlled to perform synchronous closing operation to realize the parallel operation between the first generator set and the second generator set;

[0057] Specifically, when the parallel speed and voltage regulating port of the first generator set is in an open state, it indicates that the control system of the generator set allows direct communication and control with the upper machine controller. At this time, the following control process can be performed to achieve parallel operation between the first and second generator sets. Under the condition that the parallel speed and voltage regulating port is open, the upper machine controller can directly access the control system of the first generator set and take over its speed and voltage regulating functions. This means that the upper machine controller will replace the dedicated control system of the original generator set and become the main unit for controlling and adjusting the voltage, frequency and phase angle of the generator set. The upper machine controller adjusts the speed and voltage regulating parameters of the generator set according to the needs of parallel operation, ensuring that it is consistent or close to consistent with the voltage, frequency and phase angle of the second generator set. This process includes adjusting the PID (Proportional-Integral-Derivative) controller parameters to ensure the matching of speed and voltage regulating performance. The upper machine controller coordinates the speed and voltage regulating functions between the first and second generator sets, enabling the two sets to run synchronously and share the load according to the set power distribution ratio, ensuring the stability and efficiency of parallel operation.

[0058] After the speed and voltage regulating functions are taken over and the parameters are adjusted, the upper machine controller will detect whether the voltage, frequency and phase angle of the first and second generator sets meet the parallel conditions. Once the conditions are met, the upper machine controller will send a synchronous closing signal to the parallel switch cabinet. After receiving the closing instruction from the upper machine controller, the parallel switch cabinet performs synchronous closing operation, i.e. closes the parallel circuit breaker at the correct time point, connecting the first generator set to the circuit parallel to the second generator set. After successful synchronous closing, the first and second generator sets begin to operate in parallel, jointly supplying power to the power system, and through the coordinated control of the upper machine controller, ensuring the stability of power quality and the balance of power distribution.

[0059] After the upper machine controller takes over the speed and voltage regulating functions, it can simplify the complexity of parallel operation, reduce human intervention and improve the automation level of the parallel process. Through the unified coordination of the upper machine controller, the speed and voltage of the generator set can be more accurately controlled, thereby improving the efficiency and stability of parallel operation and reducing power loss and unnecessary competition between sets. The synchronous closing operation ensures the safety of the parallel process, preventing the generation of current shock and circulating current, and avoiding the risk of set overload disconnection and system collapse. Under the condition that the parallel speed and voltage regulating port of the first generator set is in an open state, the upper machine controller takes over the speed and voltage regulating functions and controls the synchronous closing operation of the parallel switch cabinet, which can safely and efficiently realize the parallel operation between the generator sets. This process fully utilizes the coordinated control capability of the upper machine controller, simplifies the parallel operation and improves the stability and safety of parallel operation.

[0060] Step S203, if the parallel speed and voltage regulating port of the first generator set is in the non-full open state, the upper controller is controlled to activate the port opening driving circuit to drive the first generator set to open the parallel speed and voltage regulating port, and the upper controller is controlled to take over the speed and voltage regulating function, and the parallel switch cabinet is controlled to be synchronously closed to realize the parallel operation between the first and second generator sets.

[0061] Specifically, when the parallel speed and voltage regulating port of the first generator set is in the non-full open state, it means that the control system of the generator set will not automatically or directly respond to the control request of the upper controller. In this case, an additional activation mechanism is needed to open the parallel speed and voltage regulating port to realize the parallel operation of the generator set. The speed and voltage regulating port of the generator set in the non-full open state needs to be activated by a specific driving signal to activate its opening mechanism. After detecting this state, the upper controller will activate the port opening driving circuit. This circuit is designed to generate and send activation signals to prompt the control system of the first generator set to open the parallel speed and voltage regulating port. The port opening driving circuit contains intermediate relays or other similar signal amplification and conversion devices. These devices receive instructions from the upper controller, amplify and convert the signals into a format that the dedicated control system can recognize, and then transmit the converted signals to the control system of the generator set to drive the opening of the parallel speed and voltage regulating port.

[0062] Once the parallel speed and voltage regulating port of the first generator set is activated and opened, the upper controller can take over the speed and voltage regulating function, i.e., receive control from the dedicated control system of the first generator set and directly control the speed and voltage of the unit. The upper controller will adjust the speed and voltage regulating parameters of the first generator set according to the needs of parallel operation to ensure that its voltage, frequency and phase angle are consistent or close to consistent with those of the second generator set. This process involves adjusting the PID control parameters to match the speed and voltage regulating characteristics of the second generator set. After taking over the speed and voltage regulating function, the upper controller will coordinate the operation between the first and second generator sets to ensure the stability and efficiency of parallel operation, including power distribution, load balancing and power quality control.

[0063] After the speed and voltage regulating parameters of the first generator set are adjusted to be consistent with those of the second generator set, the upper controller will generate a synchronous closing signal to ensure that the two generator sets can be connected to the parallel circuit at the same time or at the appropriate time point. According to the instructions of the upper controller, the circuit breakers in the parallel switch cabinet are controlled to perform synchronous closing operation, i.e., close the parallel circuit breakers at the precisely calculated time to connect the first and second generator sets in parallel to supply power to the power system together. After successful synchronous closing, the first and second generator sets start parallel operation, and their operation states are coordinated by the upper controller to ensure the stability and safety of the power system.

[0064] In the non-complete open state, by activating the port opening driving circuit, the host computer controller can break through the limitation of the original control system on parallel speed regulation and voltage regulation function, realize direct control of the first generator set, and promote effective parallel operation of generator sets with different control systems and communication protocols. The above process enables the parallel operation of generator sets with different control systems and communication protocols even if the control system of the generator set has certain closedness, through the coordination of the additional driving circuit and the host computer controller, enhancing the compatibility and flexibility of the system. Through the takeover and parameter adjustment of the host computer controller, the stability and coordination of the first generator set and the second generator set in parallel operation can be ensured, and the power quality problems caused by mismatched speed regulation and voltage regulation characteristics can be reduced.

[0065] When the parallel speed regulation and voltage regulation port of the first generator set is in a non-complete open state, by activating the port opening driving circuit, the host computer controller can promote the opening of the parallel speed regulation and voltage regulation port, thereby taking over the speed regulation and voltage regulation function and controlling the synchronous closing operation of the parallel switch cabinet, realizing the parallel operation between the first generator set and the second generator set. This process overcomes technical barriers, enhances the compatibility of the system for generator sets with different control systems and communication protocols, and improves the stability and efficiency of parallel operation, which is of great significance for power backup in power emergency backup systems and data centers.

[0066] By judging the open state of the parallel speed regulation and voltage regulation port of the first generator set, the goal of effectively parallel controlling generator sets under different technical conditions is achieved. When the port is in an open state, the host controller directly takes over the speed regulation and voltage regulation function, accurately controls the synchronous closing of the parallel switch cabinet, and ensures the seamless parallel operation of the first generator set and the second generator set, improving the efficiency of the parallel process and the stability of the power system. When the port is in a non-complete open state, the port opening driving circuit is activated to drive the first generator set to open the parallel speed regulation and voltage regulation port, and then the host controller takes over the control, also achieving synchronous closing and parallel operation, solving the parallel operation problem caused by technical barriers. This method not only breaks through the limitation of parallel control of generator sets with different control systems and communication protocols, enhances the compatibility and control flexibility of the system, but also significantly improves the safety and power quality of parallel operation, providing more reliable and stable emergency power backup for critical infrastructure such as data centers and communication hubs, thereby solving the problem of lack of effective parallel control of generator sets with different control systems and communication protocols in existing technology.

[0067] In a specific implementation process, if the parallel speed and voltage adjustment port of the first generator set is in the open state, the host controller takes over the speed and voltage adjustment function, including: if the parallel speed and voltage adjustment 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 with the output voltage, frequency and phase angle of the first generator set to determine the initial deviation of speed and voltage adjustment; according to the initial deviation, adjusting the PID parameters of the speed and voltage adjustment unit of the first generator set, until the voltage, frequency and phase angle of the first generator set and the second generator set are within the preset range.

[0068] Specifically, when the parallel speed and voltage adjustment port of the first generator set is in the open state, the host controller first detects the actual voltage, frequency and phase angle on the parallel busbar. These parameters reflect the operating state of the existing parallel system or power grid and are important reference indicators before parallel operation. The host controller compares the detected parallel busbar parameters with the voltage, frequency and phase angle output by the first generator set to determine the difference between them, i.e. the initial deviation of speed and voltage adjustment. This initial deviation reflects the gap between the current operating state of the first generator set and the requirements of the parallel system.

[0069] According to the detected initial deviation, the host controller adjusts the PID (Proportional-Integral-Derivative) controller parameters of the speed and voltage adjustment unit of the first generator set. The adjustment of PID parameters aims to reduce the deviation, so that the output voltage, frequency and phase angle of the first generator set gradually approach the actual parameters of the parallel busbar until they are within the preset range. The adjustment of PID parameters is a dynamic process. According to the change of deviation, the host controller continuously optimizes the PID parameters until the output parameters of the first generator set and the parallel busbar parameters meet the preset matching standard, i.e. the voltage, frequency and phase angle difference is controlled within the allowable error range, creating conditions for parallel operation.

[0070] By precise deviation detection and PID parameter adjustment, the running state of the first generator set before parallel connection is optimized, ensuring that its voltage, frequency and phase angle match those of the second generator set, laying a foundation for parallel operation. The adjusted PID parameters can effectively control the speed and voltage regulating unit of the first generator set, reducing current impact and uneven power distribution during parallel connection, thereby improving the stability and safety of parallel operation. Through the coordinated control of the upper controller, the first generator set can quickly adjust to the optimal state before parallel connection, reducing the time delay during parallel connection and improving the response speed and overall efficiency of the parallel system. In summary, under the condition that the parallel speed and voltage regulating port of the first generator set is in the state of non-full opening, by detecting and adjusting the PID parameters, the output parameters of the first generator set are ensured to reach the preset matching range with the parameters of the parallel bus, creating favorable conditions for the parallel operation of the first and second generator sets. Not only does it optimize the preparation state before parallel connection of the generator set, but also enhances the stability and efficiency of parallel operation, providing a reliable emergency backup power solution for critical scenarios such as data centers and communication hubs.

[0071] In some embodiments of the present application, if the parallel speed and voltage regulating port of the first generator set is in the non-full opening state, the upper controller is controlled to activate the port opening driving circuit to drive the first generator set to open the parallel speed and voltage regulating port, including: if the parallel speed and voltage regulating port of the first generator set is in the non-full opening state, a port opening request signal is sent to the dedicated control system of the first generator set to request to open the parallel speed and voltage regulating port of the first generator set; if the dedicated control system responds and allows to open the parallel speed and voltage regulating port of the first generator set, the upper controller is controlled to activate the port opening driving 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 regulating port.

[0072] Specifically, when the parallel speed and voltage regulating port of the first generator set is detected to be in a non-fully open state, a port opening request signal will be sent to the dedicated control system of the first generator set. This request signal usually contains specific communication protocols or control codes to meet the input format of the dedicated control system. The purpose of the request is to indicate to the dedicated control system of the first generator set that the upper controller needs to access and control the parallel speed and voltage regulating port of the generator set to achieve parallel operation with the second generator set. After receiving the port opening request, the dedicated control system will determine whether to allow the opening of the parallel speed and voltage regulating port according to the pre-set rules or conditions. This judgment involves safety checks, operation state evaluation and confirmation of other technical conditions. If the dedicated control system determines that the current conditions meet the requirements of port opening, it will generate an allow signal to inform the upper controller that the parallel speed and voltage regulating port can be activated. After the dedicated control system allows the opening of the parallel speed and voltage regulating port, the upper controller will activate the port opening drive circuit. This circuit contains necessary electronic components and control modules, such as intermediate relays, for generating and sending drive signals. The port opening drive circuit generates corresponding control signals according to the instructions of the upper controller. These signals are customized according to the needs of the dedicated control system and the characteristics of the generator set, ensuring effective activation of the parallel speed and voltage regulating port. The upper controller transmits the generated control signals to the parallel speed and voltage regulating port of the first generator set through communication lines or hard-wired connections. After receiving the control signals, the parallel speed and voltage regulating port of the first generator set will be activated, i.e. opened to a state that can be directly accessed and controlled by the upper controller. This provides the necessary conditions for subsequent speed and voltage regulating function takeover and synchronous closing operation of the parallel switch cabinet.

[0073] This process solves the problem of parallel control when the parallel speed and voltage regulating port of the first generator set is in a non-fully open state. By sending a request, activating a drive circuit and transmitting control signals through the upper controller, it can break through technical barriers and achieve effective parallel operation between generator sets with different control systems and communication protocols. Not only does it improve the compatibility and efficiency of the system, but also enhances the safety of the parallel process and the stability of the power system. In summary, under the condition of non-fully open state, through the interaction between the upper controller and the dedicated control system, the port opening drive circuit is activated, the parallel speed and voltage regulating port is successfully opened, and key technical support is provided for the parallel operation of generator sets with different control systems and communication protocols.

[0074] Further, 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 the preset range, the method further comprises: transmitting the adjusted PID parameters to the controllers of the first generator set and the second generator set using the parallel communication interface to update the control parameters of the speed and voltage regulating unit of each generator set.

[0075] Specifically, after the upper controller takes over the speed and voltage regulation function and completes the PID parameter adjustment, the speed and voltage regulation characteristics of the first generator set are within the preset matching range of the actual voltage, frequency, and phase angle of the parallel bus. This means that through adjustment, the first generator set can stably operate in parallel with the parallel system or the second generator set. The parallel communication interface is a channel for data exchange between generator sets and between generator sets and the upper controller. It can support multiple communication protocols, such as 485 serial communication, Ethernet communication, or CAN bus communication, to meet the communication needs 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 generator set and the second generator set. This process ensures accurate transmission of parameters, 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 controller of the generator set will update the control parameters of its internal speed and voltage regulating unit to ensure consistency with the adjusted parameters. This updating process is a key step for each generator set to adapt to parallel operation, allowing each unit to maintain the same speed and voltage regulation performance in parallel, thereby achieving balanced power distribution and stable operation of the system.

[0076] By transmitting the adjusted PID parameters through the parallel communication interface, the control consistency between each generator set can be enhanced, ensuring the matching of voltage, frequency, and phase angle during parallel operation, reducing current impact and uneven power distribution during parallel operation, and improving the stability and safety of parallel operation. The updated PID parameters optimize the speed and voltage regulation characteristics of the generator set during parallel operation, helping to improve the response speed and power output quality of the parallel system, providing better power support for critical 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, improving the compatibility and expandability of the system, allowing efficient and stable parameter coordination when units with different control systems and communication protocols are operated in parallel.

[0077] In some embodiments of the present application, an intelligent adaptive PID parameter adjustment algorithm is introduced, which can automatically detect the voltage, frequency and phase angle changes on the parallel busbar, and adjust the PID parameters of each generator set in real time according to 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 running state of the parallel system. According to the monitored parameters, the algorithm automatically adjusts the PID parameters of the speed and voltage regulation unit of each generator set. The purpose of adjustment is to minimize the current impact during parallel connection, ensure the balanced power distribution of each unit, and maintain stable operation of the system. The algorithm establishes a closed-loop feedback system, sends the adjusted PID parameters to each generator set controller through the parallel communication cable, and receives and analyzes the unit operation data, continuously optimizes the parameters until the ideal parallel operation state is reached. The algorithm also has intelligent optimization function, which can predict potential faults or unstable states, and automatically adjust the PID parameters before the problem occurs, so as to prevent unit overload disconnection or system collapse.

[0078] By introducing the intelligent adaptive PID parameter adjustment algorithm, the dynamic response capability of the parallel system is enhanced, which can quickly respond to small changes in the parameters of the parallel system and maintain stable power output. By adjusting the PID parameters in real time, it ensures that each generator set bears the load according to its rated power ratio, avoiding the efficiency loss caused by uneven power distribution. The closed-loop control and intelligent optimization function of the algorithm can predict and prevent faults, ensuring the stable operation of the parallel system even in harsh working conditions.

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

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

[0081] The first parallel control strategy: using a dedicated control system, the parallel port open unit parallel control technology. This kind of generator set has a special unit control and function control system, although the parallel speed and voltage regulation ports of its engine and generator are open; but due to the incompatibility of the parallel communication protocol with other systems, the unit control systems cannot communicate with each other.

[0082] The control strategy is as follows: A parallel control panel is added to the original generator set as a host computer, with the same controller as the other generator sets to be paralleled. This new host computer takes over the parallel speed regulation and voltage regulation functions of the original generator set, as well as the synchronous opening and closing control of the parallel switchgear. Parallel communication between different generator sets is achieved through the host computer controller. This ensures the control performance of the original generator set while performing voltage, frequency, and phase angle detection and parallel synchronization adjustment (different generator sets adjust their analog speed regulation and voltage regulation units' PID controllers separately to make their parallel speed regulation and voltage regulation unit characteristics nearly identical). It enables the parallel functions of the generator set to be paralleled and the original generator set, such as proportional load distribution of active and reactive power and synchronous load transfer, achieving effective parallel operation of the two generator sets. This technical strategy overcomes the industry problem of system incompatibility between different generator sets, preventing communication and parallel control; through the host computer, the original generator set's speed regulation and voltage regulation control system was developed, breaking through communication limitations; and enabling parallel operation of different generator sets. (See also...) Figure 3 Parallel system output cabinet 1, parallel switch cabinet 2, PT cabinet 3, main control cabinet 4 (central control cabinet), grounding resistor cabinet 7, first diesel generator set 21, first diesel generator set control system 22, second diesel generator set 8, general parallel unit controller 6, parallel communication cable 9, monitoring communication cable 10, parallel busbar 11. Figure 3 The diagram shows a parallel system of two second diesel generator sets and two first diesel generator sets; the control system 22 of the first diesel generator sets has its parallel speed regulation and pressure regulation ports open to the outside.

[0083] Two of the original diesel generator sets (21) have independent unit control and systems. The two newly added diesel generator sets (8) use a general-purpose parallel unit controller (6). To ensure the operation of the new units in conjunction with the original units, the specific plan is as follows:

[0084] The control system of the first diesel generator set 21 is changed from parallel mode to single-unit mode, and manual closing and opening permissions are enabled. A general-purpose controller is added as the host computer of the first generator set control system. Through a wiring connection, it takes over the parallel analog speed regulation and voltage regulation signals of the first diesel generator set control system 22; it also takes over the closing and opening control of the synchronous switch cabinet of the first generator set control system (i.e., disconnecting the original generator set control system from the engine and generator auxiliary speed regulation and voltage regulation harness, and replacing the wiring with the host computer controller; disconnecting the original generator set control system from the parallel switch cabinet synchronous closing and opening, and replacing the wiring with the host computer controller; disconnecting the original generator set start signal from the host computer controller---hard wire or monitoring communication cable). The host computer controllers of the two first diesel generator sets 21 are connected to the newly added second diesel generator set 8 via a 485 communication cable. A 120-ohm resistor is added to the end of each communication cable of the first and last generator sets for impedance matching to ensure good communication between the generator sets.

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

[0086] The second parallel control strategy employs a dedicated control system, utilizing different control systems and communication protocols for parallel control of generator units, where the parallel speed and voltage regulation ports are not fully open. The GOV and AVR parallel speed and voltage regulation ports are not open before synchronous closing during parallel operation. The solution is to install a higher-level parallel control panel on the original generator unit. This panel's controller is identical to the controllers of the other units to be paralleled, and it takes over the original unit's parallel speed and voltage regulation ports and control functions. Simultaneously, a parallel port drive control circuit is added to drive the original unit to open the GOV and AVR parallel regulation ports, thereby achieving parallel detection, synchronous closing, and synchronous control functions between units, enabling effective parallel operation of multiple brand generator units. See also... Figure 4 Parallel system output cabinet 1, parallel switch cabinet 2, PT cabinet 3, main control cabinet 4 (central 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, general parallel unit controller 6, unit parallel speed regulation and voltage regulation port open drive circuit 33, port open drive circuit control signal cable 34, host computer control panel 35, parallel communication cable 9, monitoring communication cable 10, parallel busbar 11. Figure 4 A diagram showing a parallel system of two second diesel generator sets and two first diesel generator sets is presented; however, the parallel speed regulation and voltage regulation ports of the control system 22 of the first diesel generator sets are not fully open. Conversely, the parallel speed regulation and voltage regulation ports of the control system 22 of the first diesel generator sets are open.

[0087] Two of the second diesel generator sets are capacity-enhancing units to be connected in parallel, in order to achieve parallel operation of four units. The two second diesel generator sets use a universal parallel generator set controller 6; the control system for the two first diesel generator sets uses the universal parallel generator set controller 6 as the host computer controller. The host computer control panel 35 of the first diesel generator set 21 has the universal parallel generator set controller 6 built-in, and also integrates port development drive circuitry.

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

[0089] The control system of the first diesel generator set was changed from parallel mode to single-unit mode, and manual closing and opening permissions were enabled. The added host computer control panel integrates a general parallel generator set controller and 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; it also takes over the closing and opening control of the synchronous switch cabinet of the first diesel generator set control system (i.e., disconnecting the original generator set control system from the engine and generator auxiliary speed regulation and voltage regulation harness, and replacing the line with the host computer controller; disconnecting the original generator set control system from the parallel switch cabinet synchronous closing and opening, and replacing the line with the host computer controller; disconnecting the original generator set start signal from the host computer controller---hard wire or monitoring communication cable).

[0090] like Figure 4 As shown, after the generator set receives the start-up parallel command, the first diesel generator set 21 starts, and the generator set voltage and frequency become effective. After reaching the rated value, the generator set parallel speed regulation and voltage regulation port opening drive circuit 33 feeds the generator set voltage and frequency signal back to the original generator set bus input port through the intermediate relay, as a virtual signal of parallel virtual bus voltage and frequency signal, driving the original generator set to open the parallel speed regulation and voltage regulation simulation adjustment port. At this time, the host computer controller detects the voltage and frequency detected by the actual parallel busbar 11, and performs the parallel speed regulation and voltage regulation signal detection and PID adjustment of the original generator set; when the general parallel generator set controller 6 detects that the first diesel generator set 21 is synchronized with the busbar, it issues a synchronous closing command (if the first diesel generator set first reaches the load closing condition, the host computer controller first controls the parallel switch cabinet 2 to close and supply power; other generator sets are synchronously connected in parallel with it); then the generator sets with different operating systems and communication protocols adjust their speed regulation and voltage regulation unit PID respectively, so that their speed regulation and voltage regulation unit characteristics are matched, realizing the synchronous parallel connection and parallel operation control between the generator set to be connected in parallel and the original generator set, realizing the effective parallel stable operation of generator sets with two or more different operating systems and communication protocols.

[0091] By adding a host computer, a technology for taking over the original unit's speed regulation, voltage regulation, and parallel control system was developed, overcoming communication limitations and enabling parallel connection of units with different control systems and communication protocols. For units with different control systems and communication protocols that have dedicated parallel unit control systems, and whose engine and generator control units' parallel GOV and AVR parallel regulation ports are not fully open, a virtual bus voltage control system was developed. This system uses analog signals to drive the original unit's GOV and AVR ports to open, overcoming port limitations and bypassing communication restrictions, thus enabling parallel connection of units with different control systems and communication protocols.

[0092] This application also provides a generator set parallel control device. It should be noted that the generator set parallel control device of this application can be used to execute the generator set parallel control method provided in this application. This device is used to implement the above embodiments and preferred embodiments; details already described will not be repeated. As used below, the term "module" can refer to a combination of software and / or hardware that implements a predetermined function. Although the device described in the following embodiments is preferably implemented in software, hardware implementation, or a combination of software and hardware, is also possible and contemplated.

[0093] The following describes the generator set parallel control device provided in the embodiments of this application.

[0094] Figure 5 This is a structural block diagram of a generator set parallel control device according to an embodiment of this 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 determine whether the parallel speed regulation and voltage regulation port of the first generator set is in an open state or a partially open state. If the parallel speed regulation and voltage regulation port of the first generator set is in the open state, the first control unit is used to control the upper controller to take over the speed regulation and voltage regulation function and control the parallel switch cabinet to perform a synchronous closing operation to realize the 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 partially open state, 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 regulation and voltage regulation port, control the upper controller to take over the speed regulation and voltage regulation function, and control the parallel switch cabinet to close synchronously to realize the parallel operation between the first generator set and the second generator set.

[0095] By determining the open state of the parallel speed and voltage regulation port of the first generator set, the goal of effectively controlling generator sets under different technical conditions in parallel is achieved. When the port is open, the upper controller directly takes over the speed and voltage regulation function, precisely controlling the parallel switchgear to close synchronously, ensuring seamless parallel operation of the first and second generator sets, improving the efficiency of the parallel process and the stability of the power system. When the port is not fully open, the port opening drive circuit is activated, driving the first generator set to open its parallel speed and voltage regulation port. Subsequently, the upper controller takes over the control, similarly achieving synchronous closing and parallel operation, solving the parallel operation problem 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, providing more reliable and stable emergency power protection for critical infrastructure such as data centers and communication hubs. This solves the problem of the lack of technical solutions in existing technologies for effectively paralleling generator sets with different control systems and communication protocols.

[0096] In the 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 if 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 generator set and the second generator set are within a preset range.

[0097] By precisely detecting deviations and adjusting PID parameters, the operating state of the first generator set before parallel connection was optimized, ensuring that its voltage, frequency, and phase angle matched those of the second generator set, laying the foundation for parallel operation. The adjusted PID parameters effectively control the speed and voltage regulation unit of the first generator set, reducing current surges and uneven power distribution during parallel connection, 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 its optimal state before parallel connection, reducing time delays during the parallel connection process and improving the response speed and overall efficiency of the parallel system. In summary, with the parallel speed and voltage regulation port of the first generator set open, by detecting and adjusting the PID parameters, the output parameters of the first generator set are ensured to reach the preset matching range with the parallel bus parameters, creating favorable conditions for the parallel operation of the first and second generator sets. This not only optimizes the preparation state before generator parallel connection but also enhances the stability and efficiency of parallel operation, providing a reliable power emergency backup solution for critical scenarios such as data centers and communication hubs.

[0098] In some embodiments of this 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 if the parallel speed-regulating and voltage-regulating port of the first generator set is in the partially open state, requesting the opening of the parallel speed-regulating and voltage-regulating port of the first generator set. 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 the opening of the parallel speed-regulating and voltage-regulating port of the first generator set. The driving module is configured to transmit the control signal to the first generator set, driving the first generator set to open the parallel speed-regulating and voltage-regulating port.

[0099] The above solutions address the challenge of parallel control when the parallel speed and voltage regulation port of the first generator set is not fully open. By sending requests, activating the drive circuit, and transmitting control signals through the upper-level controller, technical barriers can be overcome to achieve effective parallel operation between generator sets with different control systems and communication protocols. This not only improves system compatibility and operating efficiency but also enhances the safety of the parallel operation process and the stability of the power system. In summary, by interacting with the dedicated control system in a partially open state, the interaction between the upper-level controller and the dedicated control system activates the port opening drive circuit, successfully opening the parallel speed and voltage regulation port. This provides crucial technical support for achieving parallel operation of generator sets with different control systems and communication protocols.

[0100] Furthermore, the aforementioned device also includes an update unit, used to adjust the PID parameters of the speed regulation and voltage regulation 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, and then use 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 regulation and voltage regulation unit of each generator set.

[0101] Transmitting adjusted PID parameters via the parallel communication interface enhances control consistency among generator sets, ensuring voltage, frequency, and phase angle matching during parallel operation. This reduces current surges and uneven power distribution during parallel operation, improving stability and safety. The updated PID parameters further optimize the speed and voltage regulation characteristics of generator sets during parallel operation, contributing to improved system response speed and power output quality, and providing superior power assurance for critical scenarios such as data centers and communication hubs. The parallel communication interface overcomes communication barriers between generator sets with different control systems and communication protocols, enhancing system compatibility and scalability, and enabling efficient and stable parameter coordination when generator sets with different control systems and communication protocols are running in parallel.

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

[0103] The memory may include non-permanent memory in computer-readable media, such as 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] This invention provides a computer-readable storage medium including a stored program, wherein, when the program is executed, it controls the device containing the computer-readable storage medium to perform the generator set parallel control method.

[0105] This invention provides a processor for running a program, wherein the program executes the generator set parallel control method.

[0106] This invention provides an electronic device, which includes a processor, a memory, and a program stored in the memory and executable on the processor. When the processor executes the program, it implements the steps of the above-described generator parallel control method. The device described herein can be a server, PC, PAD, mobile phone, etc.

[0107] This application also provides a computer program product that, when executed on a data processing device, is adapted to perform the steps of initializing the above-described generator set parallel control method.

[0108] It is obvious to those skilled in the art that the modules or steps of the present invention described above can be implemented using general-purpose computing devices. They can be centralized on a single computing device or distributed across a network of multiple computing devices. They can be implemented using computer-executable program code, and thus can be stored in a storage device for execution by a computing device. In some cases, the steps shown or described can be performed in a different order than those described herein, or they 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 understand that embodiments of this application can be provided as methods, systems, or computer program products. Therefore, this application can take the form of a completely hardware embodiment, a completely software embodiment, or an embodiment combining software and hardware aspects. Furthermore, this application can take the form of a computer program product embodied on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code.

[0110] This application is described with reference to flowchart illustrations and / or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of this application. It will be understood that each block of the flowchart illustrations and / or block diagrams, and combinations of blocks in the flowchart illustrations and / or block diagrams, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, special-purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, generate instructions for implementing the flowchart... Figure 1 One or more processes and / or boxes Figure 1 A device that provides the functions specified in one or more boxes.

[0111] These computer program instructions may also be stored in a computer-readable storage medium that can direct a computer or other programmable data processing device to function in a particular manner, such that the instructions stored in the computer-readable storage medium produce an article of manufacture including instruction means, which are implemented in a process Figure 1 One or more processes and / or boxes Figure 1 The function specified in one or more boxes.

[0112] These computer program instructions may also be loaded onto a computer or other programmable data processing equipment to cause a series of operational steps to be performed on the computer or other programmable equipment to produce a computer-implemented process, thereby providing instructions that execute on the computer or other programmable equipment for implementing the process.Figure 1 One or more processes and / or boxes Figure 1 The steps of the function specified in one or more boxes.

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

[0114] Memory may include non-persistent memory in computer-readable media, such as random access memory (RAM) and / or non-volatile memory, such as read-only memory (ROM) or flash RAM. Memory is an example of computer-readable media.

[0115] Computer-readable media includes both permanent and non-permanent, removable and non-removable media that can store information using any method or technology. Information can be computer-readable instructions, data structures, modules of programs, or other data. Examples of computer storage media include, but are not limited to, phase-change memory (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, CD-ROM, digital versatile optical disc (DVD) or other optical storage, magnetic tape, disk storage or other magnetic storage devices, or any other non-transferable medium that can be used to store information accessible by a computing device. As defined herein, computer-readable media does not include transient computer-readable media, such as modulated data signals and carrier waves.

[0116] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above 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 "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus. Unless otherwise specified, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes that element.

[0118] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A parallel control system for generator sets, 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 include a first generator set and a second generator set. The first generator set is equipped with a dedicated control system. The parallel speed regulation and voltage regulation port of the dedicated control system is in an open state or a partially open state. The second generator set is equipped with a general-purpose parallel generator set controller that operates in parallel with the first generator set. A parallel switchgear is connected to each of the generator sets to perform synchronous closing operations; A host computer controller is communicatively connected to both the dedicated control system of the first generator set and the general parallel generator set controller of the second generator set, and is used to control the parallel operation of the first generator set and the second generator set using a preset strategy. The preset strategy includes: when the parallel speed regulation and voltage regulation port of the first generator set is in the open state, the host 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 partially open state, the host computer controller activates the port opening drive circuit to drive the first generator set to open the parallel speed regulation and voltage regulation port, 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, which is used to adjust the PID parameters of the voltage and speed regulation units of each generator set to match the voltage, frequency and phase angle conditions required for 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 communication cables between the host computer controller and each generator set controller. The communication cables are equipped with impedance matching terminating resistors at the first and last generator sets.

4. The generator set parallel control system according to claim 1, characterized in that, The port open drive circuit includes an intermediate relay for transmitting control signals to activate the speed and voltage regulation functions 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 for performing synchronous closing and opening operations according to the instructions of the host computer 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 regulation and voltage regulation port of the first generator set is in the incompletely 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 regulation and voltage regulation port.

7. A method for parallel control of generator sets, characterized in that, The generator set parallel control method is used in 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 regulation and voltage regulation port of the first generator set is in an open state or not in a fully open state; If the parallel speed regulation and voltage regulation port of the first generator set is in the open state, the upper controller is controlled to take over the speed regulation and voltage regulation function, and the parallel switch cabinet is controlled to perform synchronous closing operation, so as to realize the 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 incompletely 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, and the upper controller is controlled to take over the speed regulation and voltage regulation function, and the parallel switch cabinet is controlled to close synchronously to realize the 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 regulation and voltage regulation port of the first generator set is in the open state, the upper controller is controlled to take over the speed regulation and voltage regulation functions, including: If the parallel speed regulation and voltage regulation port of the first generator set is in the open state, the actual voltage, frequency and phase angle of the parallel busbar are detected and compared with the output voltage, frequency and phase angle of the first generator set to determine the initial deviation of speed regulation and voltage regulation. Based on the initial deviation, adjust the PID parameters of the speed and voltage regulation unit of the first generator set until the voltage, frequency, and phase angle of the first and second generator sets are within the preset range.

9. The method according to claim 7, characterized in that, If the parallel speed regulation and voltage regulation port of the first generator set is in the incompletely 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 includes: If the parallel speed regulation and voltage regulation port of the first generator set is in the incompletely open state, a port opening request signal is sent to the dedicated control system of the first generator set to request the opening of the parallel speed regulation and voltage regulation port of the first generator set. If the dedicated control system responds and allows the opening of the parallel speed regulation and voltage regulation port of the first generator set, it controls the upper controller to activate the port opening drive circuit and generate a corresponding control signal. The control signal is transmitted to the first generator set, driving 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 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, the method further includes: The adjusted PID parameters are transmitted to the controllers of the first and second generator sets using a parallel communication interface to update the control parameters of the speed regulation and voltage regulation units of each generator set.

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