Simulation analysis system, method and device for biogas generator set and medium

Abstract

The invention relates to a biogas generator set simulation analysis system, method and device and a medium. The system comprises a biogas prime mover, a speed regulation subsystem of the biogas prime mover, a synchronous generator and an excitation subsystem of the synchronous generator. The biogas prime mover and the speed regulation subsystem form a closed loop, the synchronous generator and the excitation subsystem form a closed loop, the biogas prime mover is connected with the synchronous generator, and the output end of the synchronous generator is connected to a power grid; the speed regulation subsystem is used for regulating the power output of the biogas generator set and keeping the rotating speed within a set precision range; the excitation subsystem adopts a self-excitation constant-voltage and controllable phase compound excitation system, and automatically adjusts and stabilizes the terminal voltage of a synchronous generator when a load fluctuates, so as to guarantee the normal operation of electrical equipment. By analyzing and verifying the working condition of the excitation subsystem, the overall operation stability of the power system can be accurately evaluated, so that a powerful basis is provided for exploring to enhance the stability of the system by optimizing the excitation of the synchronous generator and controlling the rotating speed of the biogas generator.

Description

Technical Field

[0001] The present invention relates to the technical field of electrical equipment simulation, and in particular to a biogas generator set simulation analysis system, method, device and medium. Background Art

[0002] In rural microgrids, the output of thermal power generating units has been declining year by year, while the penetration rate of new energy has been increasing year by year, resulting in a serious shortage of system flexibility resources. Efficiently utilizing the widespread biogas resources in rural areas and involving them in rural microgrids can effectively cope with the impact of the randomness of new energy output.

[0003] However, in the power system in rural areas, due to the small capacity of biogas generator sets, when faced with larger system disturbances, the frequency and voltage of the system will show dynamic changes. How to accurately analyze the stability and safety of biogas generator sets in the power system has become a technical problem that needs to be solved urgently. Summary of the invention

[0004] The object of the present invention is to provide a biogas generator set simulation analysis system, method, device and medium, aiming to accurately analyze the stability and safety of the biogas generator set in the power system.

[0005] To achieve the above-mentioned purpose, in a first aspect, the present invention provides a biogas generator set simulation analysis system, comprising: a biogas prime mover and a speed regulating subsystem thereof, and a synchronous generator and an excitation subsystem thereof; wherein the biogas prime mover and its speed regulating subsystem form a closed loop, the synchronous generator and its excitation subsystem form a closed loop, the biogas prime mover is connected to the synchronous generator, and the output end of the synchronous generator is connected to a power grid;

[0006] The speed regulation subsystem is used to adjust the power output of the biogas generator set and keep the speed within a set accuracy range; the excitation subsystem adopts a self-excited constant voltage and controllable phase compound excitation system, which is used to automatically adjust and stabilize the terminal voltage of the synchronous generator when the load fluctuates to ensure the normal operation of electrical equipment in the power grid.

[0007] Preferably, the speed regulation subsystem includes a speed measurement and amplification unit, a signal adjustment unit, a servo amplification unit, a failure zone unit and an oil motor unit, wherein the input of the speed regulation subsystem is connected to the speed measurement and amplification unit, the speed measurement and amplification unit is sequentially connected to the signal adjustment unit, the servo amplification unit, the failure zone unit and the oil motor unit, and is output by the oil motor unit; the input of the speed regulation subsystem is a speed / power reference value and a speed measurement signal, and the output of the speed regulation subsystem is a throttle opening adjustment of the biogas generator.

[0008] Preferably, the gain in the measurement amplification unit is a unit power adjustment coefficient, and its reciprocal is configured as a static adjustment coefficient of the speed control subsystem, which is used to control the steady-state speed adjustment deviation of the speed control subsystem, so as to determine the active load distribution between the units operating in parallel without performing carrier frequency adjustment; the servo amplifier unit is used to power amplify the control signal to drive the actuator; the failure zone unit is used to identify the dead zone of action of the mechanical speed measuring device or the hydraulic equipment, so as to avoid frequent action of the speed governor when the load fluctuation is relatively large; the oil motor unit is configured as the actuator of the speed control subsystem, including a pressure regulating valve and a servo motor, and adopts unit feedback to form a hydraulic follow-up system to execute the speed control output instruction.

[0009] Preferably, the biogas generator set simulation and analysis system further comprises a time lag unit connected to the output of the speed regulation subsystem and used for adjusting the time lag effect of throttle opening change on mechanical power output.

[0010] Preferably, the phase compound excitation excitation system includes a phase-shifting reactor, a current transformer, a phase compound excitation transformer and a rectifier; wherein the phase-shifting reactor performs phase-shifting processing on the three-phase voltage output by the synchronous generator to generate an excitation current component when the synchronous generator is unloaded, and sends the excitation current component to the phase compound excitation transformer; the load current compound excitation component measured by the current transformer is synthesized with the excitation current component, and the compound excitation component processed by the phase compound excitation transformer is used for excitation of the generator through a rectification process; the output voltage V E1 Directly corresponds to the terminal voltage V t With current I t The vector sum of to perform the regulation of the excitation current:

[0011]

[0012] Among them, K P , K I , j is the relevant variable parameter set;

[0013] The rectifier is configured as a three-phase full-wave bridge uncontrolled rectifier. Based on the commutation voltage drop of the rectifier during the commutation process of the diode, the output voltage V of the rectifier is calculated. B1 :

[0014] V B1 =F EX V E1

[0015] Among them, F EX =f(I N ), I N is the normalized current, I FDIis the rectifier load current, K C is a constant related to the commutation reactance, function f(I N ) is associated with the operating mode of the rectifier circuit.

[0016] Preferably, the phase compound excitation system also includes a shunt-type automatic voltage regulator, which is used to control the accuracy of the synchronous generator output voltage to match a predetermined standard; the shunt-type automatic voltage regulator includes a voltage measurement unit module, a setting voltage module, a PI regulator module, a PWM modulation unit module, a drive unit and a power module.

[0017] Preferably, the phase compound excitation system further comprises an excitation stabilizer using differential feedback compensation, which is used to compensate for the phase shift caused by the time delay of the excitation system within a specific frequency range by adjusting parameters.

[0018] In a second aspect, the present invention provides an analysis method for the above-mentioned biogas generator set simulation analysis system, the analysis method comprising:

[0019] Based on PSCAD / EMTDC, establish the biogas prime mover and its speed regulation subsystem, as well as the synchronous generator and its excitation subsystem;

[0020] Verify and analyze the performance of the excitation subsystem, including verifying the steady-state voltage regulation performance of the synchronous generator and / or verifying the steady-state voltage regulation rate of the synchronous generator;

[0021] Verify and analyze the performance of the speed regulation subsystem, including verification of steady-state and / or transient speed regulation.

[0022] In a third aspect, the present invention provides an electronic device, comprising a memory and a processor, wherein the memory stores a computer program executable on the processor, and the computer program implements the steps of the analysis method described above when executed by the processor.

[0023] In a fourth aspect, the present invention provides a computer-readable storage medium having a computer program stored thereon, wherein the computer program implements the steps of the analysis method described above when executed by a processor.

[0024] The beneficial effects of adopting the above embodiment are:

[0025] The biogas prime mover and its speed regulating subsystem, as well as the synchronous generator and its excitation subsystem are established by digital simulation technology; the speed regulating subsystem can adjust the power output of the biogas generator set and keep the speed within the set accuracy range; the excitation subsystem can automatically adjust and stabilize the terminal voltage of the synchronous generator when the load fluctuates to ensure the normal operation of the electrical equipment in the power grid. Furthermore, by establishing an accurate biogas power generation system model and simulating it using digital simulation software, a scientific basis can be provided for the evaluation of the working state of the biogas generator set, thereby accurately analyzing the stability and safety of the biogas generator set in the power system. In addition, the excitation subsystem in the present invention adopts a self-excited constant voltage and controllable phase compound excitation system, which can automatically adjust and stabilize the terminal voltage of the synchronous generator when the load fluctuates to ensure the normal operation of the electrical equipment. By analyzing and verifying the working condition of the excitation subsystem, the overall operating stability of the power system can be accurately evaluated, thereby providing a strong basis for exploring how to enhance the stability of the system by optimizing the excitation of the synchronous generator and the speed control of the biogas machine. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 A model block diagram of an embodiment of a biogas generator set simulation analysis system provided in this application;

[0027] Figure 2 It is the principle block diagram of the mathematical model of the biogas generator speed control system model;

[0028] Figure 3 This is the mathematical model diagram of the biogas generator;

[0029] Figure 4 This is the model diagram of the biogas generator speed control system;

[0030] Figure 5 It is the standard synchronous motor model diagram in the PSCAD / EMTDC model library;

[0031] Figure 6 This is the principle diagram of the phase compound excitation system;

[0032] Figure 7 It is the mathematical model diagram of the phase compound excitation transformer and rectifier;

[0033] Figure 8 This is the principle block diagram of the automatic voltage regulator;

[0034] Fig. 9 It is the mathematical model diagram of the differential feedback excitation system stabilizer;

[0035] Fig.10 It is the block diagram of the excitation system model;

[0036] Fig.11 This is a simulation model diagram of a biogas generator set;

[0037] Fig.12 is the generator terminal voltage waveform (with uniform addition and subtraction of load);

[0038] Fig.13 is the generator terminal voltage waveform (sudden load);

[0039] Fig.14 is the generator rotor speed waveform (sudden increase or decrease of load);

[0040] Fig.15 is the generator rotor speed waveform (evenly adding or subtracting load);

[0041] Fig.16 A method flow chart of an analysis method of an embodiment of a biogas generator set simulation analysis system provided in this application;

[0042] Fig.17 A functional block diagram of an electronic device according to an embodiment of the present invention. DETAILED DESCRIPTION

[0043] In order to make the purpose, technical scheme and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0044] It should be noted that the descriptions of "first", "second", etc. in the present invention are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the technical solutions between the various embodiments can be combined with each other, but they must be based on the ability of ordinary technicians in the field to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0045] The inventor of this application has considered that with the advancement of biomass energy technology, biogas power generation devices have not only been enhanced in capacity, but their structures have also become more complex. The system fluctuations, dynamically changing frequencies and voltages caused by the characteristics of biogas power generation, coupled with the low voltage and short power supply line problems of the system, make the stability and safety analysis of generators, power supply lines and circuit breakers challenging, and digital simulation technology can provide an effective tool to solve this problem. By establishing an accurate biogas power generation system model and simulating it using digital simulation software, for example, by simulating the key components of the biogas generator set through PSCAD / EMTDC software, explore ways to enhance the stability of the system by optimizing the excitation of the synchronous generator and the speed control of the biogas machine.

[0046] Based on this, the present application provides a biogas generator set simulation analysis system, method, device and medium, which are described in detail below.

[0047] Reference Figure 1 The present application discloses a simulation and analysis system for a biogas generator set, comprising: a biogas prime mover and its speed regulating subsystem, and a synchronous generator and its excitation subsystem; wherein the biogas prime mover and its speed regulating subsystem form a closed loop, the synchronous generator and its excitation subsystem form a closed loop, the biogas prime mover is connected to the synchronous generator, and the output end of the synchronous generator is connected to a power grid; the speed regulating subsystem is used to adjust the power output of the biogas generator set and keep the speed within a set accuracy range; the excitation subsystem adopts a self-excited constant voltage and controllable phase compound excitation system, which is used to automatically adjust and stabilize the terminal voltage of the synchronous generator when the load fluctuates, so as to ensure the normal operation of electrical equipment in the power grid.

[0048] This embodiment uses digital simulation technology to establish a biogas prime mover and its speed regulation subsystem, as well as a synchronous generator and its excitation subsystem; the speed regulation subsystem can adjust the power output of the biogas generator set and keep the speed within the set accuracy range; the excitation subsystem can automatically adjust and stabilize the terminal voltage of the synchronous generator when the load fluctuates to ensure the normal operation of electrical equipment in the power grid. Furthermore, by establishing an accurate biogas power generation system model and simulating it using digital simulation software, a scientific basis can be provided for the evaluation of the working state of the biogas generator set, thereby accurately analyzing the stability and safety of the biogas generator set in the power system. In addition, the excitation subsystem in the present invention adopts a self-excited constant voltage and controllable phase compound excitation system, which can automatically adjust and stabilize the terminal voltage of the synchronous generator when the load fluctuates to ensure the normal operation of the electrical equipment. By analyzing and verifying the working conditions of the excitation subsystem, the overall operating stability of the power system can be accurately evaluated, thereby providing a strong basis for exploring how to enhance the stability of the system by optimizing the excitation of the synchronous generator and the speed control of the biogas machine.

[0049] Furthermore, the present application is aimed at rural microgrids involving biogas generator sets, and studies a method for establishing a simulation model of a biogas generator set based on PSCAD / EMTDC.

[0050] like Figure 1 As shown in the figure, the biogas generator set is mainly composed of a biogas prime mover (internal combustion engine) and its speed control system, as well as a synchronous generator and its excitation system. Therefore, the biogas generator set has two closed loops: the speed control system and the phase compound excitation voltage regulation system. Specifically:

[0051] Regarding the model of the biogas generator and its speed control system, the biogas generator set consists of a biogas prime mover and its speed control system and a synchronous generator and its excitation system. The system framework diagram reveals the configuration of two closed loops: the speed control system and the phase compound excitation voltage regulation system. The main function of the speed control system is to adjust the power output of the unit and keep the speed within the specified accuracy range, such as Figure 2 As shown in the figure, it includes key links such as speed measurement amplification, signal conditioning and servo amplification. The principle block diagram of the system shows in detail how the above functions are implemented.

[0052] Figure 2 The input of the speed control system is the speed / power reference value (ω ref and P ref ) and the speed measurement signal ω, the output is the throttle opening μ of the biogas generator. The gain K of the measurement amplifier G is the unit power adjustment coefficient, and its reciprocal is the static adjustment coefficient b of the speed control system p , which determines the steady-state speed regulation deviation of the speed control system. It determines the active load distribution between the units running in parallel without carrier frequency regulation. The signal regulation link is to set the speed control unit to improve the dynamic response performance of the speed control system, depending on the specific speed control system. The servo amplifier is the link that amplifies the control signal to drive the actuator, which is usually considered as the first-order inertia link, T R is the corresponding time constant. The failure zone is used to indicate the dead zone of mechanical speed measuring devices or hydraulic equipment, which has an important impact on the sensitivity of the speed control system. On the other hand, the failure zone of the electric hydraulic or microcomputer speed regulator is very small. In order to avoid frequent operation of the speed regulator when the load fluctuation is relatively large, it is necessary to set the failure zone artificially. The oil motor link is the actuator of the speed control system, which consists of a pressure regulating valve and a servo motor. This link is equivalent to the integral link in mathematics. It uses unit feedback to form a hydraulic follow-up system to execute the speed control output command. Among them, T SM Represents the integral time constant of the oil motor, L C1 and L C2 Represent the opening and closing speed limits of the regulator door, μ max and μ minIndicates the opening limit of the regulating valve.

[0053] When conducting dynamic simulation analysis of the power system, the prime mover model of the biogas generator must include the time lag effect of the throttle opening change on the mechanical power output. Specifically, the activation of the biogas generator speed control system leads to an increase in the jet volume, and the expansion and combustion process of the gas in the cylinder delays the mechanical power output, which is manifested as an obvious power output delay. Figure 3 As shown, the simulation model of the biogas generator should include such time-delay features and be represented by time-delay links.

[0054] It should be noted that the speed control system model in the simulation is composed of a combination of proportional-integral regulation and series lead-lag compensation. The specific structure is as follows: Figure 4 shown.

[0055] About the synchronous generator model: Figure 5 As shown, the standard synchronous motor model is provided by the PSCAD / EMTDC model library, which supports direct interface with the excitation system, biogas generator speed control system and main distribution network. The model is established based on the ideal synchronous motor assumptions and Park transformation, and is suitable for power frequency steady-state and transient analysis of power systems. The synchronous motor model can also simulate the motor saturation characteristics. The motor no-load characteristic curve needs to be input to consider the saturation effect, which is mainly approximated by the D-axis magnetic circuit saturation. The design quality of the excitation system directly affects the stable operation of the power system. The excitation regulation system in this application adopts a self-excited constant voltage controllable phase compound excitation method, integrating components such as the phase compound excitation system and the automatic voltage regulator.

[0056] About the synchronous generator excitation system model. Electrical equipment in rural areas usually has inductive load characteristics, which causes the load current to have a demagnetizing effect on the AC synchronous generator, thereby affecting the voltage change at the generator end. For this reason, an automatic voltage regulator (AVR) or a self-excited constant voltage device must be used. These devices can automatically adjust and stabilize the generator terminal voltage when the load fluctuates to ensure the normal operation of the electrical equipment. Obviously, the design quality of the excitation system of the synchronous generator directly determines the overall operating stability of the power system. In this application, the excitation regulation system used is a self-excited constant voltage and controllable phase compound excitation system, including multiple components including a phase compound excitation system and an automatic voltage regulator. As Figure 6 As shown, the phase compound excitation system includes a phase-shifting reactor L1, a capacitor bank C1, a current transformer TA, a phase compound excitation transformer TC1 and a rectifier 1V1.

[0057] The reactor first performs phase shifting on the three-phase voltage output by the generator to generate the excitation current component when the generator is unloaded, which is then sent to the phase compound excitation transformer. Subsequently, the load current compound excitation component measured by the current transformer is synthesized with it, and the compound excitation component processed by the phase compound excitation transformer is used to excite the generator through a rectification process. The AC voltage produced by the phase compound excitation transformer directly corresponds to the vector sum of the terminal voltage and current, thereby achieving the regulation of the excitation current, as shown below.

[0058]

[0059] The rectifier used is a three-phase full-wave bridge non-controlled type, and the AC power supply at its input end usually has inductive reactance. During the commutation process of the diode, a commutation voltage drop will appear. This voltage drop is proportional to the load current on the DC side of the rectifier, which is equivalent to introducing a commutation reactance between the DC output of the rectifier and the load. Therefore, as the load current increases, the actual output voltage of the rectifier will decrease. Therefore, considering the commutation voltage drop, the output voltage expression of the rectifier is as follows:

[0060] V B1 =F EX V E1

[0061] In the formula, F EX =f(I N ), I N is the normalized current, K C is a constant related to the commutation reactance, function f(I N ) is related to the working mode of the rectifier circuit. For a three-phase full-wave uncontrolled rectifier, f(I N )=1-0.577I N Therefore, the detailed mathematical model of the phase compound excitation transformer and rectifier is as follows: Figure 7 shown.

[0062] Although the structure of the phase compound excitation system is simple and has high reliability, its performance in voltage regulation accuracy cannot fully meet the requirements of the generator output voltage quality. Therefore, the present invention uses a shunt-type automatic voltage regulator to supplement it to ensure that the accuracy of the generator output voltage meets the predetermined standard. The automatic voltage regulator system includes a voltage measurement unit module, a setting voltage module, a PI regulator module, a PWM modulation unit module, a drive unit and a power module. The detailed structure is shown in FIG. Figure 8 The principle block diagram is used to illustrate.

[0063] Excitation systems include two types, AC and DC. Both have components with significant time-delay characteristics. Without proper compensation, this will reduce the dynamic response capability of the system. Stable excitation control, especially those based on machine-end voltage feedback, requires that the steady-state gain of the excitation system be adjusted to a lower level to maintain stable operation under no-load conditions. Therefore, this application adds an excitation stabilizer to optimize its dynamic performance. The excitation stabilizer can be implemented in various forms, and can use either series compensation or feedback compensation. This application uses a differential feedback link. The core of the design of this link is to compensate for the phase shift caused by the time delay of the excitation system to the greatest extent within a specific frequency range by adjusting the parameters, such as Fig. 9 , Fig.10 shown.

[0064] Furthermore, the simulation model of biogas generator set established in PSCAD is as follows: Fig.11 As shown. In order to evaluate the performance of the excitation system of the biogas generator set, the following verifications were conducted: First, the steady-state voltage regulation performance of the generator set during the process of three-phase balanced load from full load to no load, and from no load to full load was tested; secondly, the transient load response of the generator to the three-phase balanced load with a power factor not exceeding 0.4 and an impedance per unit value of 1 was examined under the conditions of rated speed and no load close to the rated voltage, including the transient voltage regulation rate and the voltage recovery period. Since the load model in the PSCAD simulation is not adjustable, the scenario of putting in 40%, 30%, 20%, and 10% load in stages was simulated.

[0065] The specific simulation test includes the verification of the steady-state voltage regulation rate, and the simulation duration is set to 15 seconds: the initial 0 to 2 seconds, the generator operates stably under no-load conditions, taking into account the starting process; 2 to 6 seconds, the generator undergoes a change from no load to full load; during 6 to 8 seconds, the generator operates stably under full load; 8 to 12 seconds, the generator load returns from full load to no load; in the final 12 to 15 seconds, the generator re-enters the no-load stable state. The simulation duration for verifying the transient voltage regulation rate is 10 seconds, of which the generator is in a no-load state for the first 2 seconds, and then a specific three-phase balanced load is suddenly added at 2 seconds. In the simulation results, the generator terminal voltage waveforms are as follows Fig.12 and Fig.13 shown.

[0066] Through simulation analysis, it is found that the steady-state voltage regulation rate of the excitation system of the biogas generator set reaches 0.45%, while the transient voltage regulation rate is 6.24%. Within the voltage tolerance range of ±1%, the time required for voltage recovery is only 0.81 seconds, showing the excellent performance of the excitation system in terms of stability and response speed.

[0067] The performance of the biogas generator speed regulation system was further evaluated, involving the verification of steady-state and transient speed regulation. The test method for steady-state speed regulation is similar to the test of steady-state voltage regulation. For transient speed regulation, the simulation duration is set to 10 seconds, 50% load is added at 2 seconds, the load is further increased to 80% at 4 seconds, full load is increased at 6 seconds, and the load is suddenly reduced to no load at 8 seconds. The speed change of the generator rotor is simulated by the waveform Fig.14 and 15 From the simulation results, it can be calculated that the steady-state rate regulation is 3.59% and the transient rate regulation is 5.2%, which shows that the speed regulation system also has good steady-state and dynamic performance.

[0068] This embodiment also provides an analysis method based on the above-mentioned biogas generator set simulation analysis system, such as Fig.16 As shown, the analysis method comprises:

[0069] S1. Establish the biogas prime mover and its speed regulation subsystem, as well as the synchronous generator and its excitation subsystem based on PSCAD / EMTDC;

[0070] S2. Verify and analyze the performance of the excitation subsystem, including verifying the steady-state voltage regulation performance of the synchronous generator and / or verifying the steady-state voltage regulation rate of the synchronous generator;

[0071] S3. Verify and analyze the performance of the speed regulation subsystem, including verification of steady-state and / or transient speed regulation.

[0072] For the terms, technical solutions, etc. involved in each step of the analysis method, please refer to the description of the various embodiments of the biogas generator set simulation analysis system above, which will not be repeated here.

[0073] Each module in the above-mentioned biogas generator set simulation analysis system can be implemented in whole or in part by software, hardware and their combination. Each of the above-mentioned modules can be embedded in or independent of the processor in the computer device in the form of hardware, or can be stored in the memory in the computer device in the form of software, so that the processor can call and execute the corresponding operations of each of the above modules.

[0074] It should be understood that the size of the serial numbers of the steps in the above embodiments does not mean the order of execution. The execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiments of the present application.

[0075] Reference Fig.17 , is a schematic diagram of the operating environment of a preferred embodiment of the biogas generator set simulation analysis system 10 of the present invention.

[0076] In this embodiment, the biogas generator simulation analysis system 10 is installed and runs in an electronic device 1. The electronic device 1 is a device that can automatically perform numerical calculations and / or information processing according to pre-set or stored instructions. The electronic device 1 can be a computer, or a single network server, a server group consisting of multiple network servers, or a cloud based on cloud computing consisting of a large number of hosts or network servers, wherein cloud computing is a type of distributed computing, a super virtual computer composed of a group of loosely coupled computer sets. (The electronic device 1 can be a terminal device with storage and computing functions, such as a server, a smart phone, a tablet computer, a portable computer, a desktop computer, etc. In one embodiment, when the electronic device 1 is a server, the server can be one or more of a rack server, a blade server, a tower server, a cabinet server, etc.)

[0077] In this embodiment, the electronic device 1 may include, but is not limited to, a memory 11, a processor 12, and a network interface 13 that can be interconnected via a system bus, and the memory 11 stores a biogas generator set simulation analysis system 10 that can be run on the processor 12. It should be noted that Figure 1 The electronic device 1 is shown only with components 11 - 13 , but it should be understood that it is not required to implement all of the components shown, and more or fewer components may be implemented instead.

[0078] The memory 11 includes a memory and at least one type of readable storage medium. The memory provides a cache for the operation of the electronic device 1; the readable storage medium may be a non-volatile storage medium such as a flash memory, a hard disk, a multimedia card, a card-type memory (e.g., SD or DX memory, etc.), a random access memory (RAM), a static random access memory (SRAM), a read-only memory (ROM), an electrically erasable programmable read-only memory (EEPROM), a programmable read-only memory (PROM), a magnetic memory, a disk, an optical disk, etc. In some embodiments, the readable storage medium may be an internal storage unit of the electronic device 1, such as a hard disk of the electronic device 1; in other embodiments, the non-volatile storage medium may also be an external storage device of the electronic device 1, such as a plug-in hard disk equipped on the electronic device 1, a smart memory card (Smart Media Card, SMC), a secure digital (Secure Digital, SD) card, a flash card (Flash Card), etc. In this embodiment, the readable storage medium of the memory 11 is generally used to store an operating system and various application software installed on the electronic device 1, such as storing a biogas generator simulation analysis system 10 in an embodiment of the present invention. In addition, the memory 11 can also be used to temporarily store various types of data that have been output or are to be output.

[0079] The processor 12 may be a central processing unit (CPU), a controller, a microcontroller, a microprocessor, or other data processing chips in some embodiments. The processor 12 is generally used to control the overall operation of the electronic device 1, such as performing control and processing related to data interaction or communication with other devices. In this embodiment, the processor 12 is used to run the program code or process data stored in the memory 11, such as the biogas generator set simulation analysis system 10.

[0080] The network interface 13 may include a wireless network interface or a wired network interface. The network interface 13 is generally used to establish a communication connection between the electronic device 1 and other electronic devices.

[0081] The biogas power generation set simulation analysis system 10 includes at least one computer-readable instruction stored in the memory 11 , and the at least one computer-readable instruction can be executed by the processor 12 to implement various embodiments of the present application.

[0082] In addition, the present invention further provides a computer-readable storage medium, wherein the computer-readable storage medium stores a biogas generator set simulation analysis system, and the biogas generator set simulation analysis system can be executed by at least one processor, so that the at least one processor performs the following steps:

[0083] Based on PSCAD / EMTDC, establish the biogas prime mover and its speed regulation subsystem, as well as the synchronous generator and its excitation subsystem;

[0084] Verify and analyze the performance of the excitation subsystem, including verifying the steady-state voltage regulation performance of the synchronous generator and / or verifying the steady-state voltage regulation rate of the synchronous generator;

[0085] Verify and analyze the performance of the speed regulation subsystem, including verification of steady-state and / or transient speed regulation.

[0086] The specific implementation of the computer-readable storage medium of the present invention is substantially the same as the above-mentioned electronic device 1 and each embodiment of the method, and will not be described in detail here.

[0087] It should be noted that, in this article, the terms "include", "comprises" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, an element defined by the sentence "comprises a ..." does not exclude the existence of other identical elements in the process, method, article or device including the element.

[0088] Through the description of the above implementation methods, those skilled in the art can clearly understand that the above-mentioned embodiment methods can be implemented by means of software plus a necessary general hardware platform, and of course can also be implemented by hardware, but in many cases the former is a better implementation method. Based on such an understanding, the technical solution of the present invention is essentially or the part that contributes to the prior art can be embodied in the form of a software product, which is stored in a storage medium (such as ROM / RAM, a magnetic disk, or an optical disk), and includes a number of instructions for enabling a terminal device (which can be a mobile phone, a computer, a server, an air conditioner, or a network device, etc.) to execute the methods described in each embodiment of the present invention.

[0089] The preferred embodiments of the present invention are described above with reference to the accompanying drawings, but the scope of the present invention is not limited thereto. The serial numbers of the embodiments of the present invention are only for description and do not represent the advantages and disadvantages of the embodiments. In addition, although the logical order is shown in the flow chart, in some cases, the steps shown or described can be performed in a different order than that shown here.

[0090] Those skilled in the art may implement the present invention in a variety of variations without departing from the scope and essence of the present invention, such as using a feature of one embodiment to obtain another embodiment. Any modification, equivalent substitution and improvement made within the technical concept of the present invention shall be within the scope of the present invention.

Claims

1. A biogas generator set simulation analysis system, characterized in that: include: A biogas prime mover and its speed regulating subsystem, and a synchronous generator and its excitation subsystem; wherein the biogas prime mover and its speed regulating subsystem form a closed loop, the synchronous generator and its excitation subsystem form a closed loop, the biogas prime mover is connected to the synchronous generator, and the output end of the synchronous generator is connected to the power grid; The speed regulation subsystem is used to adjust the power output of the biogas generator set and keep the speed within a set accuracy range; the excitation subsystem adopts a self-excited constant voltage and controllable phase compound excitation system, which is used to automatically adjust and stabilize the terminal voltage of the synchronous generator when the load fluctuates to ensure the normal operation of electrical equipment in the power grid.

2. The biogas generator set simulation analysis system according to claim 1, characterized in that: The speed regulation subsystem includes a speed measurement and amplification unit, a signal adjustment unit, a servo amplification unit, a failure zone unit and an oil motor unit, wherein the input of the speed regulation subsystem is connected to the speed measurement and amplification unit, the speed measurement and amplification unit is sequentially connected to the signal adjustment unit, the servo amplification unit, the failure zone unit and the oil motor unit, and is output by the oil motor unit; the input of the speed regulation subsystem is a speed / power reference value and a speed measurement signal, and the output of the speed regulation subsystem is a throttle opening for adjusting the biogas generator.

3. The biogas generator set simulation analysis system according to claim 2, characterized in that: The gain in the measurement amplification unit is a unit power adjustment coefficient, the reciprocal of which is configured as a static adjustment coefficient of the speed control subsystem, which is used to control the steady-state speed adjustment deviation of the speed control subsystem to determine the active load distribution between the units running in parallel without carrier frequency adjustment; the servo amplification unit is used to power amplify the control signal to drive the actuator; The failure zone unit is used to identify the dead zone of action of the mechanical speed measuring device or the hydraulic equipment to avoid frequent action of the speed governor when the load fluctuation is relatively large; the hydraulic motor unit is configured as an actuator of the speed control subsystem, including a pressure regulating valve and a servo motor, and adopts unit feedback to form a hydraulic follow-up system to execute the speed control output instruction.

4. The biogas generator set simulation analysis system according to any one of claims 1 to 3, characterized in that: The biogas generator set simulation and analysis system further comprises a time lag unit connected to the output of the speed regulating subsystem and used for adjusting the time lag effect of the throttle opening change on the mechanical power output.

5. The biogas generator set simulation analysis system according to any one of claims 1 to 3, characterized in that: The phase compound excitation excitation system includes a phase-shifting reactor, a current transformer, a phase compound excitation transformer and a rectifier; wherein the phase-shifting reactor performs phase-shifting processing on the three-phase voltage output by the synchronous generator to generate an excitation current component when the synchronous generator is unloaded, and sends the excitation current component to the phase compound excitation transformer; the load current compound excitation component measured by the current transformer is synthesized with the excitation current component, and the compound excitation component processed by the phase compound excitation transformer is used for excitation of the generator through a rectification process; the output voltage V E1 Directly corresponds to the terminal voltage Vt and current I t The vector sum of to perform the regulation of the excitation current: Among them, K P , K I , j is the relevant variable parameter set; The rectifier is configured as a three-phase full-wave bridge uncontrolled rectifier. Based on the commutation voltage drop of the rectifier during the commutation process of the diode, the output voltage V of the rectifier is calculated. B1 : V B1 =F EX V E1 Among them, F EX =f(I N ), I N is the normalized current, I FDI is the rectifier load current, K C is a constant related to the commutation reactance, function f(I N ) is associated with the operating mode of the rectifier circuit.

6. The biogas generator set simulation analysis system according to any one of claims 1 to 3, characterized in that: The phase compound excitation system also includes a shunt-type automatic voltage regulator, which is used to control the accuracy of the synchronous generator output voltage to match a predetermined standard; the shunt-type automatic voltage regulator includes a voltage measurement unit module, a setting voltage module, a PI regulator module, a PWM modulation unit module, a drive unit and a power module.

7. The biogas generator set simulation analysis system according to any one of claims 1 to 3, characterized in that: The phase compound excitation system also includes an excitation stabilizer using differential feedback compensation, which is used to compensate for the phase deviation caused by the time delay of the excitation system within a specific frequency range by adjusting parameters.

8. An analysis method for a biogas generator set simulation analysis system according to any one of claims 1 to 7, the analysis method comprising: Based on PSCAD / EMTDC, establish the biogas prime mover and its speed regulation subsystem, as well as the synchronous generator and its excitation subsystem; Verify and analyze the performance of the excitation subsystem, including verifying the steady-state voltage regulation performance of the synchronous generator and / or verifying the steady-state voltage regulation rate of the synchronous generator; Verify and analyze the performance of the speed regulation subsystem, including verification of steady-state and / or transient speed regulation.

9. An electronic device, characterized in that: The electronic device includes a memory and a processor. The memory stores a computer program that can be run on the processor. When the computer program is executed by the processor, the steps of the analysis method according to claim 8 are implemented.

10. A computer-readable storage medium, characterized in that: The computer-readable storage medium stores a computer program, and when the computer program is executed by a processor, the steps of the analysis method according to claim 8 are implemented.

Images