A Modeling and Simulation System and Method for a Generator Control System

Abstract

The present invention discloses a modeling and simulation system and method for a generator control system. The system includes: a real-time simulation device, a communication interface device, a first unit governor, a first unit exciter, and a monitoring system; the real-time simulation device is respectively communicatively connected to the first unit governor, the first unit exciter, and the monitoring system through the communication interface device, and the monitoring system is respectively connected to the first unit governor and the first unit exciter; wherein, the real-time simulation device constructs and runs a power system model, the communication interface device conducts data communication, the first unit governor and the first unit exciter respectively control the speed regulation and excitation of the first unit, and the monitoring system monitors the operating states of all units in the power plant and respectively sends instructions to the real-time simulation device, the first unit governor, and the first unit exciter. The present invention can shorten the construction period of the modeling and simulation system for the power plant control system, simplify the modeling process, and at the same time ensure the model accuracy of the generator control system.

Description

Technical Field

[0001] The present invention relates to the technical field of power system simulation, and in particular to a modeling and simulation system and method for a generator control system. Background Art

[0002] In power system simulation, the modeling accuracy of the generator control system directly affects the power system simulation results. Currently, simulation platforms applied to engineering and production guidance include electromechanical transient simulation software such as PSASP and BPA, and electromagnetic transient software such as PSCAD and EMTDC. Simulation users need to model each generator in these simulation software environments. Usually, the generator model is established by using the theoretical model structure + on-site measured parameters, and there is a certain degree of simplification and equivalence for the generator controller. The generator control system model established by this method still has different degrees of simplification from the actual site, affecting the accuracy of the simulation results.

[0003] With the development of real-time simulation technology, a dedicated real-time simulator is used to simulate a power plant. For some power generation units of power plants under key research, the actual control equipment is used for the controller, and the real-time simulator is connected to the generator controller through a dedicated communication device to form a hardware-in-the-loop real-time simulation platform. In this simulation method, the controller of the generator does not need to be modeled and is directly replaced by the actual on-site device, completely solving the problems of modeling simplification and modeling error of the generator controller.

[0004] In the prior art, the construction period of the hardware-in-the-loop real-time simulation platform for accessing the generator controller device is long, the capital occupation is large, and the operation and maintenance cost is high. It is impossible to install the controllers of all generators in the power system in the simulation laboratory. A method is needed that can ensure the model accuracy of the generator controller without connecting all the generator controller hardware devices to the real-time simulator. Summary of the Invention

[0005] The purpose of the present invention is to provide a modeling and simulation system and method for a generator control system to solve the technical problems of long construction period and large modeling error in the prior art when modeling and simulating the generator control system.

[0006] The purpose of the present invention can be achieved by the following technical solutions:

[0007] A modeling and simulation system for a generator control system includes:

[0008] A real-time simulation device, a communication interface device, a first unit governor, a first unit exciter, and a monitoring system;

[0009] The real-time simulation device is respectively communicatively connected to the first unit governor, the first unit exciter, and the monitoring system through the communication interface device, and the monitoring system is respectively connected to the first unit governor and the first unit exciter;

[0010] Among them, the real-time simulation device constructs and runs a power system model, the communication interface device conducts data communication, the first unit governor and the first unit exciter respectively control the speed regulation and excitation of the first unit, and the monitoring system monitors the operating states of all units in the power plant and sends instructions to the real-time simulation device, the first unit governor, and the first unit exciter respectively.

[0011] Optionally, the real-time simulation device is an RTDS real-time simulator.

[0012] Optionally, the power system model includes:

[0013] A power grid model and a power plant model, and the power plant model includes a first unit body model and at least one second unit model; the power grid model is respectively connected to the first unit body model and the second unit model;

[0014] Among them, the power grid model simulates the actual power grid, the first unit body model simulates the first generator unit body, and the second unit model simulates the second generator unit.

[0015] Optionally, the second unit model includes:

[0016] A second unit body model for simulating the second generator unit body, a second unit governor model for simulating the second generator unit governor, and a second unit exciter model for simulating the second generator unit exciter;

[0017] Among them, the second unit body model is respectively connected to the second unit governor model and the second unit exciter model.

[0018] Optionally, the monitoring system sending instructions to the real-time simulation model includes:

[0019] The monitoring system sends a speed regulation instruction and an excitation instruction to the real-time simulation device through the communication interface device so as to perform speed regulation control on the second unit governor model and excitation control on the second unit exciter model.

[0020] Optionally, the monitoring system sending instructions to the first unit governor includes:

[0021] The monitoring system sends an active power increase and decrease instruction to the first unit governor.

[0022] Optionally, the monitoring system sending an instruction to the first unit exciter includes:

[0023] The monitoring system sends a reactive power increase / decrease instruction to the first unit exciter.

[0024] The present invention also provides a method for modeling and simulation of a generator control system, which is applied to a modeling and simulation system and includes:

[0025] Set the parameters of the power system model;

[0026] Run the real-time simulation device, and start the first unit governor, the first unit exciter and the monitoring system;

[0027] Conduct real-time simulation and record the test data, and determine whether it is necessary to adjust the second unit exciter model and the second unit governor model according to the test data;

[0028] When adjustment is needed, adjust the structure and / or parameters of the second unit exciter model and the second unit governor model, and repeat the steps of conducting real-time simulation and recording the test data, and determining whether it is necessary to adjust the second unit exciter model and the second unit governor model until the simulation ends.

[0029] Optionally, conducting real-time simulation and recording the test data specifically includes:

[0030] Input the same frequency signal to the first unit governor and the second unit governor model respectively, and record the corresponding output first governor signal and second governor signal;

[0031] Input the same excitation voltage signal to the first unit exciter and the second unit exciter model respectively, and record the corresponding output first excitation signal and second excitation signal.

[0032] Optionally, determining whether it is necessary to adjust the second unit exciter model and the second unit governor model according to the test data includes:

[0033] When the error between the first governor signal and the second governor signal is less than a preset governor threshold, and the error between the first excitation signal and the second excitation signal is less than a preset excitation threshold, then it is not necessary to adjust the second unit exciter model and the second unit governor model.

[0034] The present invention provides a modeling and simulation system and method for a generator control system. The system includes: a real-time simulation device, a communication interface device, a first unit governor, a first unit exciter, and a monitoring system. The real-time simulation device is respectively communicatively connected to the first unit governor, the first unit exciter, and the monitoring system through the communication interface device. The monitoring system is respectively connected to the first unit governor and the first unit exciter. Among them, the real-time simulation device constructs and runs a power system model, the communication interface device conducts data communication, the first unit governor and the first unit exciter respectively control the speed regulation and excitation of the first unit, and the monitoring system monitors the operating states of all units in the power plant and sends instructions to the real-time simulation device, the first unit governor, and the first unit exciter respectively.

[0035] In view of this, the beneficial effects brought by the present invention are:

[0036] In the present invention, the first unit governor and the first unit exciter of the first generator unit are actual hardware devices. There is no need to simulate the governor and exciter of the first generator unit in the real-time simulation device, and there is no need to connect all the generator controller hardware devices in the power plant to the real-time simulation device, which can shorten the construction period of the modeling and simulation system and simplify the modeling process. The monitoring system of the power plant is connected to the real-time simulation device through the communication interface device to complete the monitoring of the operating states of all units in the power plant and the sending of instructions, which can ensure the accuracy of the model of the generator controller. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] Figure 1 It is a schematic structural diagram of the system of the present invention;

[0038] Figure 2 It is a schematic flow diagram of the method of the present invention;

[0039] Figure 3 It is a schematic structural diagram of an embodiment of the system of the present invention;

[0040] Figure 4 It is a schematic diagram of the method of an embodiment of the method of the present invention;

[0041] Figure 5 It is a comparison diagram of the test results of the first unit governor and the second unit governor models of an embodiment of the system of the present invention. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0042] The embodiments of the present invention provide a modeling and simulation system and method for a generator control system to solve the technical problems of long construction period and large modeling error in the prior art when modeling and simulating a generator control system.

[0043] To facilitate the understanding of the present invention, the present invention will be described more comprehensively below with reference to the relevant drawings. Preferred embodiments of the present invention are shown in the drawings. However, the present invention can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, these embodiments are provided to make the disclosure of the present invention more thorough and comprehensive.

[0044] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those of ordinary skill in the technical field to which the present invention belongs. The terms used in the specification of the present invention herein are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "and / or" used herein includes any and all combinations of one or more of the related listed items.

[0045] Please refer to Figure 1 , an embodiment of a modeling and simulation system for a generator control system of the present invention, comprising:

[0046] a real-time simulation device 11, a communication interface device 22, a first unit governor 33, a first unit exciter 44, and a monitoring system 55;

[0047] The real-time simulation device 11 is respectively communicatively connected to the first unit governor 33, the first unit exciter 44, and the monitoring system 55 through the communication interface device 22, and the monitoring system 55 is respectively connected to the first unit governor 33 and the first unit exciter 44;

[0048] Among them, the real-time simulation device 11 constructs and runs a power system model, the communication interface device conducts data communication, the first unit governor 33 and the first unit exciter 44 respectively control the speed regulation and excitation of the first unit, and the monitoring system 55 monitors the operating states of all units in the power plant and sends instructions to the real-time simulation device 11, the first unit governor 33, and the first unit exciter 44 respectively.

[0049] In this embodiment, the real-time simulation device 11 constructs and runs a power system model. In a preferred embodiment, the real-time simulation device 11 is an RTDS real-time simulator. The power system model includes: a power grid model accessed by the power plant and a power plant model. The power plant model includes a first unit body model and at least one second unit model; among them, the first unit body model simulates the first generator unit body, and the second unit model simulates the second generator unit.

[0050] Specifically, the second unit model includes: a second unit body model, a second unit governor model, and a second unit exciter model; among them, the second unit body model simulates the second generator unit body, the second unit governor model simulates the governor of the second generator unit, and the second unit exciter model simulates the exciter of the second generator unit.

[0051] It should be noted that in the power system model running in the real-time simulation device 11 in this embodiment, for the first generator unit (abbreviated as the 1# unit), only the first unit body model simulating the first generator unit body is established, and there is no need to establish the governor model and exciter model of the 1# unit. The governor and exciter of the 1# unit are actual hardware control devices, which are connected to the real-time simulation device 11 through the interface device 22 to complete the speed regulation and excitation control of the 1# unit.

[0052] For the second generator unit (abbreviated as the 2# unit), it is necessary to establish a second generator unit body model simulating the 2# unit body, a second unit governor model simulating the governor of the 2# unit, and a second unit exciter model simulating the exciter of the 2# unit. At the same time, the monitoring system 55 of the power plant is connected to the real-time simulation device 11 through the communication interface device 22 to complete the monitoring of the operating status of all generator units in the power plant and the sending of commands.

[0053] It is worth noting that in this embodiment, the grid model corresponding to the actual power grid is established by using the model library components (such as transformer models, generator models, overhead line models, load models, etc.) in the RTDS real-time simulator.

[0054] In this embodiment, the communication interface device 22 realizes the communication functions between the real-time simulation device 11 and the first unit exciter 44, the first unit governor 33, and the monitoring system 55. In a preferred implementation, data communication is carried out through RTDS dedicated communication devices such as GTDO, GTDI, GTAO, and GTAI.

[0055] In this embodiment, the model of the first unit governor 33 is the same as that of the 1# generator unit governor device operating in the engineering site, the model of the first unit exciter 44 is the same as that of the 1# generator unit exciter device operating in the engineering site, and the model of the monitoring system 55 is the same as that of the power plant monitoring system device operating in the engineering site.

[0056] In this embodiment, the input signals of the speed governor 33 of the first unit are signals such as the grid-side voltage, grid-side current, terminal voltage, terminal current, position of the unit circuit breaker, and guide vane stroke of the 1# unit, and its output signals are signals such as the given governor opening of the 1# unit. The input signals of the exciter 44 of the first unit are signals such as the grid-side voltage, grid-side current, terminal voltage, terminal current, position of the unit circuit breaker, and excitation current of the 1# unit, and its output signal is the excitation voltage signal of the exciter of the 1# unit.

[0057] The monitoring system 55 monitors the operating states of all units in the power plant and sends commands to the real-time simulation device, the speed governor of the first unit, and the exciter of the first unit respectively. It can be understood that the monitoring system of a power plant can monitor the operating states of all generating units in the power plant, and all the operating states of the generator speed governors, generator exciters, and electrical information of the generator body in the power plant are collected in the monitoring system.

[0058] Specifically, signals such as the grid-side voltage, grid-side current, terminal voltage, terminal current, and position of the terminal circuit breaker of all generator units (such as the 1# unit and the 2# unit) in the power plant are sent from the real-time simulation device 11 to the monitoring system 55 through the communication interface device 22. The monitoring system 55 receives these signals, thereby realizing the monitoring of the operating states of all generator units in the power plant. The monitoring system 55 sends a signal for increasing or decreasing active power (speed regulation command) to the speed governor of the 1# unit, that is, the speed governor 33 of the first unit, and sends a signal for increasing or decreasing reactive power (excitation command) to the exciter of the 1# unit, that is, the exciter 44 of the first unit; the monitoring system 55 sends a signal for increasing or decreasing active power (speed regulation command) and a signal for increasing or decreasing reactive power (excitation command) to the real-time simulation device 11, so as to perform speed regulation control on the speed governor model of the second unit and excitation control on the exciter model of the second unit.

[0059] It should be noted that the speed governor of the first unit and the exciter of the first unit of the 1# unit are both actual hardware devices. Therefore, the monitoring system 55 sends the speed regulation command and the excitation command to the speed governor and the exciter hardware devices of the 1# unit respectively; for the speed regulation command and the excitation command sent by the monitoring system 55 to the 2# unit, since the speed governor model of the second unit and the exciter model of the second unit of the 2# unit are both digital models, the monitoring system 55 directly sends the speed regulation command and the excitation command to the real-time simulation device 11.

[0060] The modeling and simulation system of the generator control system provided in this embodiment. The first unit governor and the first unit exciter of the first generator unit are actual hardware devices. There is no need to simulate the governor and exciter of the first generator unit in the real-time simulation device, and there is no need to connect all the generator controller hardware devices of the power plant to the real-time simulation device, which can shorten the construction period of the modeling and simulation system and simplify the modeling process. The monitoring system of the power plant is connected to the real-time simulation device through a communication interface device to complete the monitoring of the operating status of all units in the power plant and the sending of instructions, which can ensure the accuracy of the generator controller model.

[0061] The modeling and simulation system of the generator control system provided in this embodiment. By establishing a generator governor model and an exciter model in the real-time simulation device that are consistent with the engineering site, it is ensured that the responses of the generator governor model and the exciter model are consistent with the actual governor and exciter hardware devices, which can ensure the accuracy of the governor model and the exciter model of the 2# unit and provide a simple method for accurate simulation of all units in the power plant.

[0062] Please refer to Figure 3 , which is another embodiment of the modeling and simulation system of a generator control system of the present invention, including: an RTDS real-time simulator, a communication interface device, the 1# generator governor of the 1# power plant, the 1# generator exciter of the 1# power plant, and the 1# power plant monitoring system.

[0063] The RTDS real-time simulator constructs and runs a power system model. The power system model includes: a power grid model accessed by the 1# power plant and a power plant model. The power plant model includes the body model of the 1# generator unit of the 1# power plant, the body model, governor model, and exciter model of the 2# generator unit of the 1# power plant. For the convenience of explanation, Figure 3 only a power plant case including 2 generator units is exemplified. Without loss of generality, this solution can be applied to power plant models containing multiple generator units. The 3# unit and the 4# unit can be modeled in the same way as the 2# unit and communicate with the power plant monitoring system 55 through the communication interface device 22 to complete the simulation test of the entire power plant.

[0064] It should be noted that for the power system model running in this real-time simulator, only the generator body model is established for the 1# unit, and there is no need to establish the governor and exciter models of the 1# generator. The governor and exciter of the 1# unit are controlled by actual hardware control devices and connected to the real-time simulator through a communication interface device to complete the speed regulation and excitation control of the 1# unit. The generator body model, the governor model, and the exciter model of the 2# unit are established for the 2# unit. At the same time, the power plant monitoring system is connected to the real-time simulator through a communication interface device to complete the monitoring of the operating status of all units in the power plant and the sending of instructions.

[0065] Specifically, the connection line 1 is used to transmit the input signals of the 1# speed governor, mainly including: signals such as the grid-side voltage, grid-side current, machine-terminal voltage, machine-terminal current, position of the unit circuit breaker switch, and generator guide vane stroke of the 1# generating unit; the connection line 2 is used to transmit the output signals of the 1# speed governor, mainly being: signals such as the opening given of the 1# generator speed governor; the connection line 3 is used to transmit the input signals of the 1# exciter, mainly including: signals such as the grid-side voltage, grid-side current, machine-terminal voltage, machine-terminal current, position of the unit circuit breaker switch, and excitation current of the 1# generating unit; the connection line 4 is used to transmit the output signals of the 1# unit exciter, mainly being: the excitation voltage signal of the 1# generator exciter; the connection line 5 realizes the communication between the 1# unit speed governor and the 1# power plant monitoring system, and is used to transmit: the active power increase and decrease signals sent by the 1# power plant monitoring system to the 1# unit speed governor; the connection line 6 realizes the communication between the 1# unit exciter and the 1# power plant monitoring system, and is used to transmit: the reactive power increase and decrease signals sent by the 1# power plant monitoring system to the 1# unit exciter; the connection line 7: the active and reactive power increase and decrease signals sent by the 1# power plant monitoring system to the speed governor model and exciter model of the 2# unit; the connection line 8: the grid-side voltage, grid-side current, machine-terminal voltage, machine-terminal current, and machine-terminal circuit breaker position signals of the 1# and 2# generating units.

[0066] It should be noted that the connection line 7 is the speed regulation command and excitation command sent by the monitoring device to the 2# unit. Since the speed governor and exciter of the 2# unit are both digital models, these two signals are directly sent to the real-time simulator; the speed governor and exciter of the 1# unit are actual hardware devices, so these two signals are sent to the actual hardware devices of the 1# unit speed governor and exciter, respectively, through the connection lines 5 and 6.

[0067] The purpose of this embodiment is to accurately model and simulate the generator control system. The speed governor and exciter of the generator are the two key control systems that have the greatest impact on the power grid. In addition, the 1# generator body (including primary equipment such as the impeller, synchronous machine, and transmission mechanism) is huge in volume and high in cost, so the modeling method is adopted and simulated by the digital model. Of course, specifically whether it is the 1# generator or which generator is connected to the hardware control device is not the scope restricted by the present invention. It is only for convenience of description that the 1# generator is taken as an example. When the present invention is actually applied, connecting any generator hardware controller does not affect the applicability of the present invention.

[0068] Please refer to Figure 2 , an embodiment of the method for modeling and simulating a generator control system of the present invention, which is applied to a modeling and simulation system, includes:

[0069] S100: Set the parameters of the power system model;

[0070] S200: Run the real-time simulation device, start the speed governor of the first unit, the exciter of the first unit, and the monitoring system;

[0071] S300: Conduct real-time simulation and record the test data, and determine whether it is necessary to adjust the exciter model of the second unit and the speed governor model of the second unit according to the test data;

[0072] S400: When adjustment is required, adjust the structure and / or parameters of the exciter model of the second unit and the speed governor model of the second unit, and repeat the steps of conducting real-time simulation and recording the test data, and determining whether it is necessary to adjust the exciter model of the second unit and the speed governor model of the second unit until the simulation ends.

[0073] In this embodiment, it is applied to the modeling and simulation system of the constructed generator control system. The modeling and simulation system includes a real-time simulation device for constructing and running a power system model, a communication interface device, the speed governor of the first unit, the exciter of the first unit, and a monitoring system. Among them, the power system model includes: a power grid model, a first unit body model, and at least one second unit model. The second unit model includes a second unit body model, a second unit speed governor model, and a second unit exciter model.

[0074] In step S100, after the modeling and simulation system is constructed, the parameters of each model are set, mainly including setting generator parameters, speed control controller parameters, and excitation controller parameters. Specifically, the generator parameters are mainly: direct-axis synchronous reactance Xd, direct-axis transient synchronous reactance Xd’, direct-axis subtransient synchronous reactance Xd”, quadrature-axis synchronous reactance Xq, quadrature-axis transient synchronous reactance Xq’, quadrature-axis subtransient synchronous reactance Xq”, negative-sequence reactance X2, direct-axis transient open-circuit time constant Td0’, quadrature-axis transient open-circuit time constant Tqo’, direct-axis subtransient open-circuit time constant Tdo”, quadrature-axis subtransient open-circuit time constant Tqo”, zero-sequence reactance Xo, moment of inertia H. The excitation controller parameters are mainly: measurement time constant TR, rectifier bridge and its trigger unit time constant Ts, AVR steady-state gain Kr, lead-lag time constant T1, lead-lag time constant T2, lead-lag time constant T3, lead-lag time constant T4, positive peak voltage Uam, negative peak voltage Uami. The speed control controller parameters are mainly: main-loop proportional gain Kp, main-loop differential gain Ki, main-loop integral gain Kd, speed control system permanent speed droop Bp, frequency dead zone Ef, power difference coefficient Ep.

[0075] It should be noted that the source of the generator parameters can be the measured report of the generator set, the source of the excitation controller parameters can be the network access detection report of the excitation control system, and the source of the speed control controller parameters can be the network access detection report of the speed control system.

[0076] In step S200, run the real-time simulation device, start the governor of the first unit, the exciter of the first unit, and the monitoring system to perform real-time simulation on the generator control system.

[0077] In step S300, conduct tests, perform real-time simulation on the generator control system and record the test data. In a preferred implementation, record the output signal of the governor and the output signal of the exciter. Specifically, performing real-time simulation and recording the test data includes: inputting the same frequency signal to the governor model of the first unit and the governor model of the second unit respectively, and recording the first speed regulation signal and the second speed regulation signal of the corresponding outputs; inputting the same excitation voltage signal to the exciter model of the first unit and the exciter model of the second unit respectively, and recording the first excitation signal and the second excitation signal of the corresponding outputs.

[0078] Specifically, apply the same input to the governor of the first unit of the 1# unit and the governor model of the second unit of the 2# unit, for example, input the same frequency signal, and record the output signals of the governors of the two generators; apply the same input to the exciter of the first unit of the 1# unit and the exciter model of the second unit of the 2# unit, for example, input the same excitation voltage signal, and record the output signals of the exciters of the two generators; if the response of the governor model of the second unit of the 2# unit is consistent with that of the governor of the first unit of the 1# unit, and the response of the exciter model of the second unit of the 2# unit is consistent with that of the exciter of the first unit of the 1# unit, then the simulation ends; if the response of the governor model of the second unit of the 2# unit is inconsistent with that of the governor of the first unit of the 1# unit, or the response of the exciter model of the second unit of the 2# unit is inconsistent with that of the exciter of the first unit of the 1# unit, then adjust the structure and / or parameters of the governor model of the second unit of the 2# unit and the exciter model of the second unit, and then continue the simulation, repeating the process of judgment and adjustment until the simulation ends.

[0079] In a preferred implementation, judging whether it is necessary to adjust the exciter model of the second unit and the governor model of the second unit according to the test data includes: when the error between the first speed regulation signal and the second speed regulation signal is less than the preset speed regulation threshold, and the error between the first excitation signal and the second excitation signal is less than the preset excitation threshold, then it is not necessary to adjust the exciter model of the second unit and the governor model of the second unit.

[0080] In step S400, when adjusting the structure and / or parameters of the exciter model of the second unit and the governor model of the second unit, the structure and parameters can be adjusted according to the grid connection detection report of the speed regulation control system and the grid connection detection report of the excitation control system, so that the governor model of the 2# unit and the governor of the first unit of the 1# unit, and the exciter model of the 2# unit and the exciter of the first unit of the 1# unit have the same output under the same input.

[0081] In this embodiment, for the 1# generator unit, only the body model of the generator unit needs to be built, and its exciter and governor are realized by external hardware devices to perform the excitation and speed regulation functions of the 1# generator; for the 2# generator unit, the body model of the generator unit, the exciter model and the governor model need to be built. The purpose of doing this is to compare the waveforms of the inputs and outputs of the exciters and governors of the 1# and 2# generators. Taking the hardware exciter and hardware governor of the 1# generator as the target, the structures and parameters of the exciter model and governor model of the 2# generator are made exactly the same as those of the hardware exciter and governor of the 1# generator. Ensure that the responses of the exciter and governor models of the 2# generator are exactly the same as those of the hardware governor and exciter of the 1# generator under the same input.

[0082] In the present invention, the first unit governor and the first unit exciter of the first generator unit are actual hardware devices. There is no need to simulate the governor and exciter of the first generator unit in the real-time simulation device, and there is no need to connect all the generator controller hardware devices of the power plant to the real-time simulation device, which can shorten the construction period of the modeling and simulation system and simplify the modeling process; the monitoring system of the power plant is connected to the real-time simulation device through a communication interface device to complete the monitoring of the operating states of all units of the power plant and the sending of instructions, which can ensure the accuracy of the model of the generator controller.

[0083] The method for modeling and simulating the generator control system provided in this embodiment can build a generator governor model and an exciter model consistent with the engineering site in the real-time simulation device, ensure that the entity governor and exciter hardware devices of the 1# unit are consistent with the responses of the governor model and exciter model of the 2# unit in the real-time simulation device, and can accurately simulate all units of the power plant, providing a simple method for accurately simulating all units of the power plant.

[0084] Please refer to Figure 4 , another embodiment of the method for modeling and simulating a generator control system of the present invention, includes:

[0085] Step 1: Build a real-time simulation test platform for the generator control system according to Figure 1 the construction.

[0086] Step 2: Establish a simulation model and set the parameters of each model. The power grid model, the body model of the 1# generator unit and the body model of the 2# generator unit in the power system model can be built using the components in the real-time simulation software model library. The governor model of the 2# generator unit and the exciter model of the 2# generator unit are established in the real-time simulation model development environment according to the control schematic diagram of the 1# generator governor (prior art) and the control schematic diagram of the 1# generator exciter (prior art).

[0087] Step 3: Run the simulation model, and start the speed governor, exciter, and plant monitoring device of Generator 1.

[0088] Step 4: Conduct the test. Apply the same input to the exciters and speed governors of Generator 1 and Generator 2, and measure the outputs of the exciters and speed governors of Generator 1 and Generator 2. If the responses of the speed governor and exciter of Generator 2 are consistent with those of Generator 1, proceed to Step 6. If the responses of the speed governor and exciter of Generator 2 are inconsistent with those of Generator 1, proceed to Step 5.

[0089] Step 5: Adjust the model structure or parameters of the speed governor and exciter of Generator 2.

[0090] Step 6: End the test.

[0091] In this embodiment, by referring to the device manuals of the exciter and speed governor manufacturers of Generator 1, the models and parameters of the exciter and speed governor of Generator 2 are established. By comparing the test waveforms of Generator 1 and Generator 2, the correctness of the models is ensured.

[0092] It should be noted that in this embodiment, the structure and / or parameters of the speed governor model and exciter model of Unit 2 are established and adjusted to make their responses consistent with the actual speed governor and exciter hardware devices in Unit 1. The monitoring system in this embodiment does not need to be modeled, and only the necessary conditions for ensuring the normal operation of the actual speed governor and exciter are required, because commands are sent to the actual speed governor and exciter through the monitoring system.

[0093] In this embodiment, only the exciters and speed governors of one unit (Unit 1) need to be established. Through the method provided in this embodiment, the accurate models of the speed governor and exciter of Generator 2 can be established, ensuring that the responses of the hardware speed governor and exciter (Generator 1) and the digital model speed governor and exciter (Generator 2) in the simulation model are consistent, providing a simple method for the accurate simulation of all units in the power plant.

[0094] Please refer to Figure 5 , when performing real-time simulation, the same frequency signal (Freq) is input to the first unit speed governor of Unit 1 and the second unit speed governor model of Unit 2 through the monitoring system, and the output signals (YpidWddyouG1, YpidWddyouG2) of the speed governors of the two generators are recorded. Among them, the horizontal axis is time, with the unit of seconds (s). It can be seen that under the same input, the output curves of the first unit speed governor of Unit 1 (actual hardware device) and the second unit speed governor model of Unit 2 (digital model) basically coincide, proving the correctness of the modeling of the second unit speed governor model of Unit 2.

[0095] Similarly, during real-time simulation, the same excitation voltage signals (VpuWDDG1, VpuWDDG3) are input to the first unit exciter of Unit 1 and the second unit exciter model of Unit 2 through the monitoring system, and the output signals (IFWDDG1, IFWDDG3) of the exciters of the two generators are recorded. Among them, the horizontal axis is time, with the unit of seconds (s). Under the same input, the output curves of the first unit exciter (actual hardware device) of Unit 1 and the second unit exciter model (digital model) of Unit 2 basically coincide, proving the correctness of the modeling of the second unit exciter model of Unit 2.

[0096] Those skilled in the art can clearly understand that for the convenience and simplicity of description, the specific working processes of the systems, devices, and units described above can refer to the corresponding processes in the foregoing method embodiments and will not be elaborated here.

[0097] In the embodiments provided in the present application, it should be understood that the disclosed systems, devices, and methods can be implemented in other ways. For example, the device embodiments described above are merely illustrative. For example, the division of the units is only a logical function division, and there may be other division methods in actual implementation. For example, multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the displayed or discussed couplings or direct couplings or communication connections to each other can be through some interfaces, and the indirect couplings or communication connections of the devices or units can be in electrical, mechanical, or other forms.

[0098] The units described as separate components may or may not be physically separated, and the components displayed as units may or may not be physical units, that is, they can be located in one place or distributed to multiple network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0099] In addition, the functional units in the various embodiments of the present invention can be integrated in a processing unit, or each unit can exist physically alone, or two or more units can be integrated in one unit. The above-mentioned integrated units can be implemented in the form of hardware or in the form of software functional units.

[0100] If the integrated unit is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on such an understanding, the technical solution of the present invention, in essence, or the part that contributes to the prior art, or all or part of the technical solution, can be embodied in the form of a software product. The computer software product is stored in a storage medium and includes several instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) to execute all or part of the steps of the methods described in the various embodiments of the present invention. The foregoing storage medium includes: various media such as USB flash drives, mobile hard disks, read-only memories (ROM, Read-Only Memory), random access memories (RAM, Random Access Memory), magnetic disks, or optical discs that can store program codes.

[0101] The above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions recorded in the foregoing embodiments or perform equivalent replacements for some of the technical features; and these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the various embodiments of the present invention.

Claims

1. A modeling and simulation system for a generator control system, characterized in that, Comprising: A real-time simulation device, a communication interface device, a first unit governor, a first unit exciter, and a monitoring system; The real-time simulation device is respectively communicatively connected to the first unit governor, the first unit exciter, and the monitoring system through the communication interface device, and the monitoring system is respectively connected to the first unit governor and the first unit exciter; Wherein, the real-time simulation device constructs and runs a power system model, the communication interface device conducts data communication, the first unit governor and the first unit exciter respectively control the speed regulation and excitation of the first unit, and the monitoring system monitors the operating states of all units in the power plant and sends instructions to the real-time simulation device, the first unit governor, and the first unit exciter respectively; the power system model includes a power grid model and a power plant model, the power plant model includes a first unit body model and at least one second unit model, and the second unit model includes a second unit governor model for simulating the governor of the second generator unit and a second unit exciter model for simulating the exciter of the second generator unit; the second unit governor model and the first unit governor respond consistently under the same input, and the second unit exciter model and the first unit exciter respond consistently under the same input, wherein, with the first unit exciter and the first unit governor as the targets, the structures and parameters of the second unit exciter model and the second unit governor model are respectively made to be correspondingly consistent.

2. The modeling and simulation system of the generator control system according to claim 1, characterized in that, The real-time simulation device is an RTDS real-time simulator.

3. The modeling and simulation system of the generator control system according to claim 1, characterized in that, The power grid model is respectively connected to the first unit body model and the second unit model; Wherein, the power grid model simulates the actual power grid, the first unit body model simulates the body of the first generator unit, and the second unit model simulates the second generator unit.

4. The modeling and simulation system of the generator control system according to claim 3, characterized in that The second unit model includes: A second unit body model for simulating the body of the second generator unit; Wherein, the second unit body model is respectively connected to the second unit governor model and the second unit exciter model.

5. The modeling and simulation system of the generator control system according to claim 4, characterized in that The instructions sent by the monitoring system to the real-time simulation device include: The monitoring system sends speed regulation instructions and excitation instructions to the real-time simulation device through the communication interface device, so as to conduct speed regulation control on the second unit governor model and excitation control on the second unit exciter model.

6. The modeling and simulation system of the generator control system according to claim 1, characterized in that, The instructions sent by the monitoring system to the first unit governor include: The monitoring system sends active power increase and decrease instructions to the first unit governor.

7. The modeling and simulation system of the generator control system according to claim 1, characterized in that The instructions sent by the monitoring system to the first unit exciter include: The monitoring system sends reactive power increase and decrease instructions to the first unit exciter.

8. A method for modeling and simulating a generator control system, which is applied to the modeling and simulation system as described in any one of claims 1-7, characterized in that, Comprising: Setting the parameters of the power system model; Running the real-time simulation device, starting the first unit governor, the first unit exciter, and the monitoring system; Conducting real-time simulation and recording test data, and judging whether it is necessary to adjust the second unit exciter model and the second unit governor model according to the test data; When adjustment is needed, adjust the structure and / or parameters of the excitation regulator model and the governor model of the second unit, repeat the steps of performing real-time simulation and recording test data, and judge whether it is necessary to adjust the excitation regulator model and the governor model of the second unit according to the test data until the simulation ends; the governor model of the second unit and the governor of the first unit have the same response under the same input, and the excitation regulator model of the second unit and the excitation regulator of the first unit have the same response under the same input, wherein, with the excitation regulator and the governor of the first unit as the targets, the structures and parameters of the excitation regulator model and the governor model of the second unit are made to be correspondingly consistent respectively.

9. The method for modeling and simulating the generator control system according to claim 8, wherein Performing real-time simulation and recording test data specifically includes: Input the same frequency signal to the governor of the first unit and the governor model of the second unit respectively, and record the first governor signal and the second governor signal of the corresponding outputs. Input the same excitation voltage signal to the excitation regulator of the first unit and the excitation regulator model of the second unit respectively, and record the first excitation signal and the second excitation signal of the corresponding outputs.

10. The method for modeling and simulation of the generator control system according to claim 9, characterized in that, Judging whether it is necessary to adjust the excitation regulator model and the governor model of the second unit according to the test data includes: When the error between the first governor signal and the second governor signal is less than the preset governor threshold, and the error between the first excitation signal and the second excitation signal is less than the preset excitation threshold, there is no need to adjust the excitation regulator model and the governor model of the second unit.

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