CN118114428A - Simulation modeling method and modeling device for hybrid extra-high voltage direct current transmission system - Google Patents
Simulation modeling method and modeling device for hybrid extra-high voltage direct current transmission system Download PDFInfo
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Abstract
The invention discloses a simulation modeling method of a hybrid extra-high voltage direct current transmission system, which comprises the following steps: determining a control object of a controlled system in a hybrid extra-high voltage direct current transmission system, and establishing a first simulation model of the controlled system according to the control object; parameters of all equipment of an alternating current power grid and a direct current transmission main circuit connected with a rectification converter station and an inversion converter station in the mixed extra-high voltage direct current transmission system are determined, and a second simulation model of the alternating current power grid and the direct current transmission main circuit connected with the rectification converter station and the inversion converter station is established according to the parameters of all the equipment; and connecting the first simulation model and the second simulation model through a data interface module to obtain the simulation model of the hybrid extra-high voltage direct current transmission system. The invention can accurately simulate the steady state and transient state characteristics of the mixed extra-high voltage direct current, truly simulate and reflect the running state of the whole process of the mixed extra-high voltage direct current transmission, is convenient for controlling the development of protection equipment, and can discover the possible problems of the mixed extra-high voltage direct current topology in time.
Description
Technical Field
The invention relates to a simulation modeling method of a direct current transmission system, in particular to a simulation modeling method and device of a hybrid extra-high voltage direct current transmission system.
Background
In recent years, hybrid direct current transmission technology has been favored by all parties and has been rapidly developed. The capacity of the hybrid direct current transmission system is also larger and larger, so as to meet the requirement of long-distance large-capacity transmission, most of the hybrid direct current transmission projects which are currently being implemented in China adopt a novel topological structure, for example, a rectifying side adopts two grid commutated converters (LCCs) in series connection, and an inverting side adopts a topological structure of connecting two Voltage Source Converters (VSCs) in series or connecting a plurality of Voltage Source Converters (VSCs) in parallel connection and then connecting a thyristor converter in series connection, as shown in fig. 1. In order to better understand the physical characteristics of the new topology structure and research the control protection strategy, simulation analysis is generally carried out by establishing a simulation model, however, the hybrid direct current topology adopts both an LCC converter and a VSC converter, so that the simulation modeling method of the hybrid direct current topology needs to be further researched.
Whether the simulation model of the hybrid extra-high voltage direct current control protection system is consistent with the performance of an actual direct current control protection system often determines whether a simulation conclusion can correctly guide the research and development of products, whether the simulation conclusion can be directly applied to fault analysis in engineering, and whether the simulation conclusion can correctly guide the optimization and improvement of the direct current control protection system. The complete simulation model of the mixed extra-high voltage direct current control protection system is consistent with the actual engineering control protection system in function, implementation method and dynamic performance, and the calculation method and logic structure are consistent, and can be consistent in operation time and operation step length.
At present, in order to truly reflect the steady state and dynamic response characteristics of a direct current system, part of research institutions adopt an electromechanical transient modeling and simulation method, the simulation method has certain limitation, and the simulation model and an actual system have certain difference. Part of the research institutions adopt a mode that an actual control protection device is connected with a physical model. By adopting the scheme of physical model and actual control protection device, the modeling of the physical model has high investment, long time consumption and great difficulty, and the physical devices are easy to damage and complicated in finding problems. Part of research institutions adopt an electromagnetic transient modeling simulation method, but the electromagnetic transient simulation generally adopts a control system in an HVDC_ Cigre _benchmark test model, the Cigre test model control system cannot reflect the control characteristics of the electromagnetic transient modeling simulation system at all, and the simulation results have large differences, so that powerful technical support is difficult to provide for the construction and operation of hybrid extra-high voltage direct current engineering.
Disclosure of Invention
The invention aims to: the invention aims to provide a simulation modeling method and a modeling device for a hybrid extra-high voltage direct current transmission system, which can accurately simulate the steady state and transient state characteristics of the hybrid extra-high voltage direct current and the interaction mechanism between alternating current and direct current systems.
The technical scheme is as follows: a simulation modeling method of a hybrid extra-high voltage direct current transmission system comprises a rectification converter station, an alternating current power grid connected with an inversion converter station, a direct current transmission main loop and a controlled system; the direct current transmission main loop is a controlled object and comprises at least one group of voltage source type converter units and at least one group of power grid commutation converter units, and comprises the following steps:
Determining a control object of a controlled system in a hybrid extra-high voltage direct current transmission system, and establishing a first simulation model of the controlled system according to the control object;
Parameters of all equipment of an alternating current power grid and a direct current transmission main circuit connected with a rectification converter station and an inversion converter station in a hybrid extra-high voltage direct current transmission system are determined, and a second simulation model of the alternating current power grid and the direct current transmission main circuit connected with the rectification converter station and the inversion converter station is established according to the parameters of all the equipment;
And connecting the first simulation model and the second simulation model through a data interface module to obtain the simulation model of the hybrid extra-high voltage direct current transmission system.
Further, the controlled system refers to a control protection system and a valve control system of the hybrid extra-high voltage direct current transmission system.
Further, the first simulation model is constructed in any one of the following ways:
According to LCC control protection device program codes of the grid commutation converter units, LCC valve control device program codes of the grid commutation converter units, VSC control protection device program codes of the voltage source converter units and VSC valve control device program codes of the voltage source converter units in the control object, respectively generating a digital LCC control protection simulation module, a digital LCC valve control simulation module, a digital VSC control protection simulation module and a digital VSC valve control simulation module, wherein the digital LCC control protection simulation module, the digital LCC valve control simulation module, the digital VSC control protection simulation module and the digital VSC valve control simulation module are connected with a second simulation model through data interface modules; constructing a first simulation model based on the digital LCC control protection simulation module, the digital LCC valve control simulation module, the digital VSC control protection simulation module and the digital VSC valve control simulation module;
According to the LCC control protection device program code of the grid commutation converter unit and the VSC control protection device program code of the voltage source converter unit in the control object, a digital LCC control protection simulation module and a digital VSC control protection simulation module are respectively generated, wherein the digital LCC control protection simulation module, the digital VSC control protection simulation module, the LCC valve control device of the grid commutation converter unit and the VSC valve control device of the voltage source converter unit are respectively connected with a second simulation model through a data interface module; constructing a first simulation model based on the digital LCC control protection simulation module, the digital VSC control protection simulation module, the LCC valve control device and the VSC valve control device;
According to LCC control protection device program codes of the grid commutation converter unit, LCC valve control device program codes of the grid commutation converter unit and VSC control protection device program codes of the voltage source converter unit in the control object, respectively generating a digital LCC control protection simulation module, a digital LCC valve control simulation module and a digital VSC control protection simulation module, wherein the digital LCC control protection simulation module, the digital VSC control protection simulation module, the digital LCC valve control simulation module and the VSC valve control device of the grid commutation converter unit are respectively connected with a second simulation model through a data interface module; constructing a first simulation model based on the digital LCC control protection simulation module, the digital VSC control protection simulation module, the digital LCC valve control simulation module and the VSC valve control device;
According to the LCC valve control device program code of the grid commutation converter unit and the VSC valve control device program code of the voltage source converter unit in the control object, a digital LCC valve control simulation module and a digital VSC valve control simulation module are respectively generated, wherein the LCC control protection device of the grid commutation converter unit, the VSC control protection device of the voltage source converter unit, the digital LCC valve control simulation module and the digital VSC valve control simulation module are respectively connected with a second simulation model through a data interface module; constructing a first simulation model based on the digital LCC valve control simulation module, the digital VSC valve control simulation module, the LCC control protection device and the VSC control protection device;
A fifth mode is that a digital LCC control protection simulation module and a digital LCC valve control simulation module are respectively generated according to LCC control protection device program codes and LCC valve control device program codes of the grid commutation converter units in the control object, wherein the digital LCC control protection simulation module, the digital LCC valve control simulation module, the VSC control protection device of the voltage source converter units and the VSC valve control device of the voltage source converter units are respectively connected with a second simulation model through a data interface module directly; constructing a first simulation model based on the digital LCC control protection simulation module, the digital LCC valve control simulation module, the VSC control protection device and the VSC valve control device;
A sixth mode is that a digital VSC control protection simulation module and a digital VSC valve control simulation module are respectively constructed according to the VSC control protection device program code and the VSC valve control device program code of the voltage source type converter unit in the control object, wherein the digital VSC control protection simulation module, the digital VSC valve control simulation module, the LCC control protection device of the grid commutation converter unit and the LCC valve control device of the grid commutation converter unit are respectively connected with the second simulation model through a data interface module; and constructing a first simulation model based on the digital VSC control protection simulation module, the digital VSC valve control simulation module, the LCC control protection device and the LCC valve control device.
Further, parameters of all equipment of an alternating current power grid and a direct current transmission main circuit connected with a rectification converter station and an inversion converter station in the hybrid extra-high voltage direct current transmission system are determined, and a second simulation model of the alternating current power grid and the direct current transmission main circuit connected with the rectification converter station and the inversion converter station is established according to the parameters of all the equipment; the specific implementation steps are as follows:
Obtaining equipment parameters and tide data of a typical grid structure of an alternating current power grid connected with a rectification converter station and an inversion converter station of a hybrid extra-high voltage direct current power transmission system;
According to the equipment parameters and the tide data of a typical grid structure of the alternating current power grid, obtaining equivalent parameters of the alternating current power grid connected with a rectification converter station and an inversion converter station of the hybrid extra-high voltage direct current power transmission system by adopting a network multiport equivalent calculation method, and respectively constructing a first sub-simulation model corresponding to the alternating current power grid connected with the rectification converter station and a second sub-simulation model corresponding to the alternating current power grid connected with the inversion converter station according to the equivalent parameters and a large-step modeling method;
Parameters of all equipment except a voltage source type converter unit in a direct current transmission main circuit in the hybrid extra-high voltage direct current transmission system are obtained, and a third sub-simulation model corresponding to the direct current transmission main circuit in the hybrid extra-high voltage direct current transmission system is built according to the parameters of all the equipment and by using a large-step modeling method;
Parameters of a voltage source type converter unit in the hybrid extra-high voltage direct current transmission system are obtained, and a fourth sub-simulation model corresponding to a direct current transmission main loop in the hybrid extra-high voltage direct current transmission system is constructed according to the parameters of the voltage source type converter unit and by using a small step modeling method;
And connecting the first sub-simulation model, the second sub-simulation model, the third sub-simulation model and the fourth sub-simulation model according to the principle that an alternating current side is connected through an alternating current circuit or an alternating current transformer and a direct current side is connected through a reactor or a direct current circuit, so as to obtain a second simulation model of the primary alternating current power grid and the direct current transmission main circuit.
Further, in the first sub-simulation model, each port of the alternating current power grid connected with the rectifying converter station is simulated by adopting an equivalent voltage source with adjustable internal potential, the actual intensity of the alternating current power grid is reflected by adopting equivalent internal impedance, and each port is connected through mutual impedance;
in the second sub-simulation model, each port of an alternating current power grid connected with an inversion converter station is simulated by adopting an equivalent voltage source with adjustable internal potential, the actual intensity of the alternating current power grid is reflected by adopting equivalent internal impedance, and each port is connected through mutual impedance.
Further, the large-step modeling method is a simulation modeling method with a simulation step length of 50 microseconds or more; the small-step modeling method is a simulation modeling method with a simulation step length of 5 microseconds or less.
Further, the data interface module is a digital and analog hardware interface board card or device, or a digital and analog software interface module.
Further, the method further comprises the following steps: building an actual hybrid extra-high voltage direct current transmission system according to a fixed die ratio through an impedance matching principle to obtain a dynamic simulation real system of the hybrid extra-high voltage direct current transmission system;
And verifying the simulation model of the hybrid extra-high voltage direct current transmission system through a dynamic simulation real system of the hybrid extra-high voltage direct current transmission system.
Further, the principles of impedance matching include:
The actual alternating current impedance and the actual direct current impedance of the hybrid extra-high voltage direct current transmission system are respectively equal to the alternating current impedance and the direct current impedance of a dynamic simulation real system of the hybrid extra-high voltage direct current transmission system;
The actual alternating voltage and the actual alternating current of the hybrid extra-high voltage direct current transmission system are respectively in a certain proportion with the alternating voltage and the alternating current of a dynamic simulation true system of the hybrid extra-high voltage direct current transmission system;
The actual direct current voltage and the actual direct current of the hybrid extra-high voltage direct current transmission system are respectively in a certain proportion with the direct current voltage and the direct current of a dynamic simulation real system of the hybrid extra-high voltage direct current transmission system.
A hybrid extra-high voltage direct current transmission system simulation modeling device, the hybrid extra-high voltage direct current transmission system including a rectification converter station and an alternating current power grid to which an inversion converter station is connected, a direct current transmission main loop and a controlled system, wherein the direct current transmission main loop includes at least one group of voltage source type converter units and at least one group of power grid commutation converter units, the modeling device includes:
The system comprises a first simulation module, a second simulation module and a control module, wherein the first simulation module is used for determining a control object of a controlled system in a hybrid extra-high voltage direct current transmission system and establishing a first simulation model of the controlled system according to the control object;
The second simulation module is used for determining parameters of all equipment of an alternating current power grid and a direct current transmission main circuit connected with a rectification converter station and an inversion converter station in the hybrid extra-high voltage direct current transmission system, and establishing a second simulation model of the alternating current power grid and the direct current transmission main circuit connected with the rectification converter station and the inversion converter station according to the parameters of all the equipment;
And the connection module is used for connecting the first simulation model and the second simulation model through the data interface module to obtain the simulation model of the hybrid extra-high voltage direct current transmission system.
Compared with the prior art, the invention has the following remarkable effects:
1. the invention adopts a scheme combining the device and the program code, can accurately simulate the steady state and transient state characteristics of the mixed extra-high voltage direct current, and truly simulate and reflect the running state of the whole process of the mixed extra-high voltage direct current transmission;
2. According to the invention, an actual hybrid extra-high voltage direct current transmission system is built according to a fixed mould ratio through an impedance matching principle, so that a dynamic simulation real system of the hybrid extra-high voltage direct current transmission system is obtained, investment and occupied area can be saved for developing related research of the hybrid extra-high voltage direct current system and research of a control protection device, and favorable conditions are created for research of hybrid extra-high voltage direct current topology and a control protection strategy.
Drawings
Fig. 1 is a diagram of a hybrid extra-high voltage bipolar dc power transmission system in accordance with the present invention;
Fig. 2 is a flowchart of a simulation modeling method of a hybrid extra-high voltage direct current transmission system provided by an embodiment of the invention;
FIG. 3 is a schematic diagram of the conversion of device program code into a digital simulation module in accordance with the present invention;
FIG. 4 is a schematic diagram of a simulation model of embodiment 1 of the present invention;
FIG. 5 is a schematic diagram of a simulation model of embodiment 2 of the present invention;
FIG. 6 is a schematic diagram of a simulation model of embodiment 3 of the present invention;
FIG. 7 is a schematic diagram of a simulation model of embodiment 4 of the present invention;
FIG. 8 is a schematic diagram of a simulation model of embodiment 5 of the present invention;
FIG. 9 is a schematic diagram of a simulation model of embodiment 6 of the present invention;
FIG. 10 (a) is a schematic diagram showing a comparison between a first simulation result of DC current and a dynamic simulation result, wherein the upper graph shows the dynamic simulation result and the lower graph shows the first simulation result;
FIG. 10 (b) is a schematic diagram showing a comparison of a first simulation result and a dynamic simulation result of a DC voltage, wherein the upper graph shows the dynamic simulation result and the lower graph shows the first simulation result;
FIG. 10 (c) is a schematic diagram showing the comparison of the first simulation result and the dynamic simulation result of the trigger angle, wherein the upper graph shows the dynamic simulation result and the lower graph shows the first simulation result;
Fig. 11 is a schematic structural diagram of a simulation modeling device for a hybrid extra-high voltage direct current transmission system according to an embodiment of the present invention.
Detailed Description
The present invention will be described in further detail below with reference to the drawings and the detailed description, so that those skilled in the art can better understand the present invention and can practice it, but the examples are not limiting of the present invention.
A bipolar hybrid extra-high voltage dc power transmission system as shown in fig. 1, comprising: the rectification converter station and the inversion converter station are connected through two direct current transmission lines, wherein: the rectification converter station is used for converting three-phase alternating current of the transmitting-end alternating current power grid into direct current and transmitting the direct current to the inversion converter station through the direct current transmission line, and the inversion converter station is used for converting the direct current into three-phase alternating current and transmitting the three-phase alternating current to the receiving-end alternating current power grid.
Determining an input signal and an output signal of a controlled system in the hybrid extra-high voltage direct current transmission system shown in fig. 1 according to a simulation modeling method flow chart shown in fig. 2, and establishing a first simulation model of the controlled system according to the input signal and the output signal, namely establishing a simulation model of a secondary system; parameters of equipment of an alternating current power grid and a direct current transmission main circuit in a hybrid extra-high voltage direct current transmission system are determined, and a second simulation model of the alternating current power grid and the direct current transmission main circuit is established according to the parameters of the equipment; i.e. a simulation model of the primary system is built. And connecting the first simulation model and the second simulation model through a data interface module to obtain the simulation model of the hybrid extra-high voltage direct current transmission system.
The specific operation is as follows: in order to build the model of the hybrid extra-high voltage direct current transmission system shown in fig. 1, firstly, a digital simulation model, namely a second simulation model, of an alternating current power grid and a direct current transmission main loop connected with converter stations at two ends of the hybrid extra-high voltage direct current transmission system shown in fig. 1 is built in a simulator, such as a simulation model of an alternating current power grid connected with a rectifier converter station, a simulation model of a direct current loop of the hybrid extra-high voltage direct current transmission system, a simulation model of an alternating current power grid connected with an inverter converter station and the like shown in fig. 4-9, wherein the simulation model of the direct current loop of the hybrid extra-high voltage direct current transmission system comprises an alternating current filter, a converter transformer, a smoothing reactor, a power grid converter unit (LCC), a direct current line, a direct current filter, a voltage source type converter unit (VSC), a bridge arm reactor, a switch knife gate and the like; the simulation model of the alternating current power grid connected with the rectification converter station, the simulation model of the direct current loop of the hybrid extra-high voltage direct current transmission system and the simulation model of the alternating current power grid connected with the inversion converter station are respectively connected with the analog quantity interface module and the digital quantity interface module; the method specifically comprises the following steps:
Step 1, obtaining equipment parameters and tide data of a typical grid structure of an alternating current power grid connected with a rectification converter station and an inversion converter station of the hybrid extra-high voltage direct current power transmission system shown in fig. 1, namely obtaining the grid structure of the alternating current system connected with the converter stations at two ends and the condition of equipment such as a connected generator and reactive compensation and the like when the hybrid extra-high voltage direct current power transmission system is put into operation or needs to be researched, and obtaining network tide data in a typical operation mode. Meanwhile, parameters of all devices connected in the whole grid structure are required to be obtained, and the parameters of the devices comprise: system power parameters, ac line voltage class parameters, ac line impedance parameters, reactive compensation equipment parameters, circuit breaker parameters, and isolation switch parameters.
Step 2, obtaining equivalent parameters of the alternating current power grid connected with the rectification converter station and the inversion converter station of the hybrid extra-high voltage direct current power transmission system by adopting a network multiport equivalent calculation method according to the obtained equipment parameters and the tide data of a typical grid structure of the alternating current power grid connected with the two ends of the converter station, adopting a large-step modeling method with a simulation step length of 50 microseconds according to the equivalent parameters, and respectively constructing a first sub-simulation model of the alternating current power grid connected with the rectification converter station by utilizing a self-contained or self-built equipment element model in a simulator, namely adopting an equivalent voltage source simulation with adjustable internal potential for each port of the alternating current power grid connected with the rectification converter station, adopting an equivalent internal impedance to reflect the actual strength of the alternating current power grid, and connecting each port through mutual impedance; and the second sub-simulation model is connected with the alternating current power grid connected with the inversion convertor station, namely, each port of the alternating current power grid connected with the inversion convertor station is simulated by adopting an equivalent voltage source with adjustable internal potential, the actual intensity of the alternating current power grid is reflected by adopting equivalent internal impedance, and each port is connected through mutual impedance.
Step 3, obtaining parameters of equipment of a direct current main circuit of the hybrid extra-high voltage direct current transmission system, including parameters of an alternating current filter, parameters of a converter transformer, parameters of a grid converter (LCC), parameters of a smoothing reactor, parameters of a direct current line, parameters of a grounding electrode line and a grounding electrode, parameters of a direct current filter, parameters of a blocking filter, parameters of an impact capacitor, parameters of a lightning arrester and a protection level, parameters of a controllable lightning arrester and a protection level, parameters of a bridge arm reactor, parameters of a starting resistor, parameters of a low-voltage reactor and parameters of a low-voltage capacitor, parameters of a BPS (ByPass Switch bypass switch) shown in fig. 1, parameters of a switch knife switch such as HSS ((HIGH SPEED SWITCH high-speed switch), NHSS (Neutral HIGH SPEED SWITCH) and the like, and adopting a large-step modeling method with a simulation step length of 50 microseconds according to the parameters of the equipment, and simultaneously constructing a third sub-simulation model of the direct current main circuit of the hybrid extra-high voltage transmission system by using a self-contained or self-built equipment element model in the simulator.
And 4, acquiring parameters of a Voltage Source Converter (VSC) of the hybrid extra-high voltage direct current transmission system, wherein the parameters comprise a sub-module structure, the number, sub-module capacitor parameters, sub-module rated voltage, sub-module rated current, sub-module switching device on resistance, sub-module switching device off resistance and sub-module discharging resistance, a small step modeling method with a simulation step of 3 microseconds is adopted according to the parameters, and a fourth sub-simulation model of a direct current main loop of the hybrid extra-high voltage direct current transmission system is built by utilizing a self-contained or self-built equipment element model in a simulator.
And 5, connecting a first sub-simulation model of an alternating current power grid connected with the rectifying converter station and a second sub-simulation model of an alternating current power grid connected with the inverting converter station with a third sub-simulation model of a direct current main circuit of the hybrid extra-high voltage direct current power transmission system through a self-contained or self-built alternating current transformer model in the simulator, connecting a fourth sub-simulation model of the direct current main circuit of the hybrid extra-high voltage direct current power transmission system with the third sub-simulation model of the direct current main circuit of the hybrid extra-high voltage direct current power transmission system through a self-contained or self-built direct current reactor model in the simulator, and finally obtaining the digital simulation model, namely the second simulation model, of the alternating current power grid connected with the two ends of the hybrid extra-high voltage direct current power transmission system and the direct current power transmission main circuit shown in fig. 1.
Step 6, determining an input signal and an output signal of a controlled system in the hybrid extra-high voltage direct current transmission system shown in fig. 1, establishing a first simulation model of the controlled system according to the input signal and the output signal, namely establishing a simulation model of a direct current control protection system and a valve control system of the hybrid extra-high voltage direct current transmission system, wherein an analog interface module sends alternating current, alternating current bus voltage, direct current voltage/current, direct current filter current and the like of a converter transformer secondary side to each module in the controlled system, a digital interface module sends an opening and closing state of a circuit breaker/isolating switch, a converter transformer tap position state and the like to each module in the controlled system, and each module in the controlled system sends opening and closing state of the circuit breaker/isolating switch, a converter transformer tap lifting command, a control mode selection and trigger pulse and the like to a digital interface module, which can be realized by one of the following six modes:
Example 1
The method shown in fig. 3 is adopted, the actual LCC control protection device program code, VSC control protection device program code, LCC valve control device program code and VSC valve control device program code are utilized, different compilers (compiler 1 or compiler 2) are used for compiling codes and constructing a digital LCC control protection simulation module, a digital LCC valve control simulation module, a digital VSC control protection simulation module and a digital VSC valve control simulation module, and the digital LCC control protection simulation module, the digital LCC valve control simulation module, the digital VSC control protection simulation module and the digital VSC valve control simulation module are directly connected with a second simulation model through a digital quantity interface module and an analog quantity interface module, so that control of the second simulation model is realized, and the control is defined as a first simulation model a as shown in fig. 4.
Example 2
Adopting the method shown in fig. 3, using the actual LCC control protection device program code and VSC control protection device program code, performing code compiling by different compilers, constructing a digital LCC control protection simulation module and a digital VSC control protection simulation module, directly connecting the digital LCC control protection simulation module and the digital VSC control protection simulation module with a second simulation model through a digital and analog software interface module, and simultaneously directly connecting the actual valve control device of the LCC converter and the actual valve control device of the VSC converter with the second simulation model through a digital and analog hardware interface board card or device, thereby realizing the control of the second simulation model, and defining the second simulation model as a first simulation model B, as shown in fig. 5.
Example 3
The method shown in fig. 3 is adopted, the actual LCC control protection device program codes, VSC control protection device program codes and LCC valve control device program codes are utilized, different compilers are utilized to compile codes and construct a digital LCC control protection simulation module, a digital VSC control protection simulation module and a digital LCC valve control simulation module, the digital LCC control protection simulation module, the digital VSC control protection simulation module and the digital LCC valve control simulation module are directly connected with a second simulation model through a digital quantity and analog quantity software interface module, and meanwhile, the actual valve control device of the VSC converter is directly connected with the second simulation model through a digital quantity and analog quantity hardware interface board or device, so that control of the second simulation model is realized, and the digital LCC control protection simulation module is defined as a first simulation model C, as shown in fig. 6.
Example 4
The method shown in fig. 3 is adopted, the actual LCC valve control device program codes and the VSC valve control device program codes are utilized, different compilers are utilized to compile codes and construct a digital LCC valve control simulation module and a digital VSC valve control simulation module, the digital LCC valve control simulation module and the digital VSC valve control simulation module are directly connected with a second simulation model through a digital quantity and analog quantity software interface module, and meanwhile the actual LCC control protection device and the VSC control protection device are directly connected with the second simulation model through a digital quantity and analog quantity hardware interface board or device, so that control of the second simulation model is realized, and the digital LCC valve control simulation module and the digital VSC valve control simulation module are defined as a first simulation model D, as shown in fig. 7.
Example 5
The method shown in fig. 3 is adopted, the actual LCC control protection device program codes and the LCC valve control device program codes are utilized, different compilers are utilized to compile codes and construct a digital LCC control protection simulation module and a digital LCC valve control simulation module, the digital LCC control protection simulation module and the digital LCC valve control simulation module are directly connected with a second simulation model through a digital quantity and analog quantity software interface module, and meanwhile the VSC real control protection device and the VSC real valve control device are directly connected with the second simulation model through a digital quantity and analog quantity hardware interface board or device, so that control of the second simulation model is achieved, and the first simulation model E is defined, as shown in fig. 8.
Example 6
Adopting the method shown in fig. 3, using the actual program codes of the VSC control protection device and the program codes of the VSC valve control device, performing code compiling by using different compilers, constructing a digital VSC control protection simulation module and a digital VSC valve control simulation module, directly connecting the digital VSC control protection simulation module and the digital VSC valve control simulation module with a second simulation model through a digital and analog software interface module, and simultaneously directly connecting the LCC real control protection device and the LCC real valve control device with the second simulation model through a digital and analog hardware interface board card or device, thereby realizing the control of the second simulation model, and defining the second simulation model as a first simulation model F, as shown in fig. 9.
In order to verify that the models built by each modeling method are equivalent, the first simulation model A shown in FIG. 4 and the second simulation model are integrated to obtain a simulation model A of the hybrid extra-high voltage direct current transmission system, the simulation model A is utilized to simulate the hybrid extra-high voltage direct current transmission system, and a first simulation result of steady state and transient state operation characteristics of the hybrid extra-high voltage direct current transmission system is obtained.
And integrating the first simulation model B shown in fig. 5 with the second simulation model to obtain a simulation model B of the hybrid extra-high voltage direct current transmission system, and performing simulation of the hybrid extra-high voltage direct current transmission system by using the simulation model B to obtain a second simulation result of steady state and transient state operation characteristics of the hybrid extra-high voltage direct current transmission system.
And integrating the first simulation model C shown in FIG. 6 with the second simulation model to obtain a simulation model C of the hybrid extra-high voltage direct current transmission system, and performing simulation of the hybrid extra-high voltage direct current transmission system by using the simulation model C to obtain a third simulation result of steady state and transient state operation characteristics of the hybrid extra-high voltage direct current transmission system.
And integrating the first simulation model D shown in FIG. 7 with the second simulation model to obtain a simulation model D of the hybrid extra-high voltage direct current transmission system, and performing simulation of the hybrid extra-high voltage direct current transmission system by using the simulation model D to obtain a fourth simulation result of steady state and transient state operation characteristics of the hybrid extra-high voltage direct current transmission system.
And integrating the first simulation model E shown in fig. 8 with the second simulation model to obtain a simulation model E of the hybrid extra-high voltage direct current transmission system, and performing simulation of the hybrid extra-high voltage direct current transmission system by using the simulation model E to obtain a fifth simulation result of steady state and transient state operation characteristics of the hybrid extra-high voltage direct current transmission system.
And integrating the first simulation model F shown in FIG. 9 with the second simulation model to obtain a simulation model F of the hybrid extra-high voltage direct current transmission system, and performing simulation of the hybrid extra-high voltage direct current transmission system by using the simulation model F to obtain a sixth simulation result of steady state and transient state operation characteristics of the hybrid extra-high voltage direct current transmission system.
Setting up an actual hybrid extra-high voltage direct current transmission system according to a fixed mould ratio through an impedance matching principle to obtain a hybrid extra-high voltage direct current transmission system dynamic simulation real system, namely ensuring that the alternating current impedance and the direct current impedance of the actual hybrid extra-high voltage direct current transmission system are respectively equal to the alternating current impedance and the direct current impedance of the hybrid extra-high voltage direct current transmission system dynamic simulation real system; the alternating voltage and alternating current of the actual hybrid extra-high voltage direct current transmission system are respectively proportional to the alternating voltage and alternating current of the dynamic simulation real system of the hybrid extra-high voltage direct current transmission system; the direct current voltage and the direct current of the actual hybrid extra-high voltage direct current transmission system are respectively proportional to the direct current voltage and the direct current of the hybrid extra-high voltage direct current transmission system dynamic simulation real system.
And carrying out simulation of the hybrid extra-high voltage direct current transmission system by utilizing a dynamic simulation real system of the hybrid extra-high voltage direct current transmission system, and obtaining a dynamic simulation real result of steady state and transient state operation characteristics of the hybrid extra-high voltage direct current transmission system.
Comparing the first simulation result, the second simulation result, the third simulation result, the fourth simulation result, the fifth simulation result, and the sixth simulation result with the dynamic simulation result, respectively, fig. 10 (a), 10 (b), and 10 (c) are schematic diagrams of the first simulation result and the dynamic simulation result in an application example. As shown in fig. 10 (a) - (c), in the stable running state and the transient state, the simulation model a and the dynamic simulation model of the hybrid extra-high voltage direct current transmission system are consistent with the curves (examples of the first simulation result and the dynamic simulation result) of the respective physical quantity parameters (such as direct current voltage, direct current and trigger angle) along with time, so that the running state reflecting the whole process of the hybrid extra-high voltage direct current transmission can be simulated accurately by adopting the simulation modeling method of the direct current transmission system by combining the device and the program code.
As shown in fig. 11, the simulation modeling device of the hybrid extra-high voltage direct current transmission system of the invention comprises: the data acquisition module is used for acquiring parameters of an alternating current power grid and equipment of a direct current transmission main loop, which are connected with a rectification converter station and an inversion converter station in the hybrid extra-high voltage direct current transmission system in real time;
The file generation module is used for respectively generating a digital LCC control protection simulation module, a digital LCC valve control simulation module, a digital VSC control protection simulation module and a digital VSC valve control simulation module according to the LCC control protection device program code and the LCC valve control device program code of the control object grid commutation converter unit;
The file construction module is used for constructing a first simulation model based on the digital LCC control protection simulation module, the digital LCC valve control simulation module, the digital VSC control protection simulation module and the digital VSC valve control simulation module; establishing a second simulation model of the AC power grid and the DC power transmission main loop connected with the rectification converter station and the inversion converter station according to parameters of the AC power grid and the DC power transmission main loop connected with the rectification converter station and the inversion converter station;
and the direct current simulation module is used for constructing a simulation model of the hybrid extra-high voltage direct current transmission system by using simulation software according to the first simulation model and the second simulation model.
In this embodiment, the present invention further includes a storage medium, where the computer readable storage medium is used to store a program, and execute the stored program to implement a method for simulation modeling of a hybrid extra-high voltage dc power transmission system.
In this embodiment, the electronic device further includes a memory and a processor, where the memory stores a computer program for the hybrid extra-high voltage direct current transmission system simulation modeling method, and the computer program is executed by the processor.
It will be appreciated by those skilled in the art that embodiments of the present invention may be provided as a method, system, or computer program product. Accordingly, the present invention may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present invention may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
The present invention is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems) and computer program products according to embodiments of the invention. It will be understood that each flow and/or block of the flowchart illustrations and/or block diagrams, and combinations of flows and/or blocks in the flowchart illustrations and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks. These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
It should be finally understood that the foregoing embodiments are merely illustrative of the technical solutions of the present invention and not limiting the scope of protection thereof, and although the present invention has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that various changes, modifications or equivalents may be made to the specific embodiments of the invention, and these changes, modifications or equivalents are within the scope of protection of the claims appended hereto.
The foregoing description is only of the preferred embodiments of the present invention, and is not intended to limit the scope of the invention, but rather is intended to cover any equivalents of the structures disclosed herein or modifications in equivalent processes, or any application, directly or indirectly, within the scope of the invention.
Claims (10)
1. A simulation modeling method of a hybrid extra-high voltage direct current transmission system comprises a rectification converter station, an alternating current power grid connected with an inversion converter station, a direct current transmission main loop and a controlled system; the direct-current transmission main loop is a controlled object and comprises at least one group of voltage source type converter units and at least one group of power grid commutation converter units, and is characterized by comprising the following steps:
Determining a control object of a controlled system in a hybrid extra-high voltage direct current transmission system, and establishing a first simulation model of the controlled system according to the control object;
Parameters of all equipment of an alternating current power grid and a direct current transmission main circuit connected with a rectification converter station and an inversion converter station in a hybrid extra-high voltage direct current transmission system are determined, and a second simulation model of the alternating current power grid and the direct current transmission main circuit connected with the rectification converter station and the inversion converter station is established according to the parameters of all the equipment;
And connecting the first simulation model and the second simulation model through a data interface module to obtain the simulation model of the hybrid extra-high voltage direct current transmission system.
2. The simulation modeling method of the hybrid extra-high voltage direct current transmission system according to claim 1, wherein the controlled system is a control protection system and a valve control system of the hybrid extra-high voltage direct current transmission system.
3. The hybrid extra-high voltage direct current transmission system simulation modeling method according to claim 1, wherein the first simulation model is constructed in any one of the following modes:
According to LCC control protection device program codes of the grid commutation converter units, LCC valve control device program codes of the grid commutation converter units, VSC control protection device program codes of the voltage source converter units and VSC valve control device program codes of the voltage source converter units in the control object, respectively generating a digital LCC control protection simulation module, a digital LCC valve control simulation module, a digital VSC control protection simulation module and a digital VSC valve control simulation module, wherein the digital LCC control protection simulation module, the digital LCC valve control simulation module, the digital VSC control protection simulation module and the digital VSC valve control simulation module are connected with a second simulation model through data interface modules; constructing a first simulation model based on the digital LCC control protection simulation module, the digital LCC valve control simulation module, the digital VSC control protection simulation module and the digital VSC valve control simulation module;
According to the LCC control protection device program code of the grid commutation converter unit and the VSC control protection device program code of the voltage source converter unit in the control object, a digital LCC control protection simulation module and a digital VSC control protection simulation module are respectively generated, wherein the digital LCC control protection simulation module, the digital VSC control protection simulation module, the LCC valve control device of the grid commutation converter unit and the VSC valve control device of the voltage source converter unit are respectively connected with a second simulation model through a data interface module; constructing a first simulation model based on the digital LCC control protection simulation module, the digital VSC control protection simulation module, the LCC valve control device and the VSC valve control device;
According to LCC control protection device program codes of the grid commutation converter unit, LCC valve control device program codes of the grid commutation converter unit and VSC control protection device program codes of the voltage source converter unit in the control object, respectively generating a digital LCC control protection simulation module, a digital LCC valve control simulation module and a digital VSC control protection simulation module, wherein the digital LCC control protection simulation module, the digital VSC control protection simulation module, the digital LCC valve control simulation module and the VSC valve control device of the grid commutation converter unit are respectively connected with a second simulation model through a data interface module; constructing a first simulation model based on the digital LCC control protection simulation module, the digital VSC control protection simulation module, the digital LCC valve control simulation module and the VSC valve control device;
According to the LCC valve control device program code of the grid commutation converter unit and the VSC valve control device program code of the voltage source converter unit in the control object, a digital LCC valve control simulation module and a digital VSC valve control simulation module are respectively generated, wherein the LCC control protection device of the grid commutation converter unit, the VSC control protection device of the voltage source converter unit, the digital LCC valve control simulation module and the digital VSC valve control simulation module are respectively connected with a second simulation model through a data interface module; constructing a first simulation model based on the digital LCC valve control simulation module, the digital VSC valve control simulation module, the LCC control protection device and the VSC control protection device;
A fifth mode is that a digital LCC control protection simulation module and a digital LCC valve control simulation module are respectively generated according to LCC control protection device program codes and LCC valve control device program codes of the grid commutation converter units in the control object, wherein the digital LCC control protection simulation module, the digital LCC valve control simulation module, the VSC control protection device of the voltage source converter units and the VSC valve control device of the voltage source converter units are respectively connected with a second simulation model through a data interface module directly; constructing a first simulation model based on the digital LCC control protection simulation module, the digital LCC valve control simulation module, the VSC control protection device and the VSC valve control device;
A sixth mode is that a digital VSC control protection simulation module and a digital VSC valve control simulation module are respectively constructed according to the VSC control protection device program code and the VSC valve control device program code of the voltage source type converter unit in the control object, wherein the digital VSC control protection simulation module, the digital VSC valve control simulation module, the LCC control protection device of the grid commutation converter unit and the LCC valve control device of the grid commutation converter unit are respectively connected with the second simulation model through a data interface module; and constructing a first simulation model based on the digital VSC control protection simulation module, the digital VSC valve control simulation module, the LCC control protection device and the LCC valve control device.
4. The simulation modeling method of the hybrid extra-high voltage direct current transmission system according to claim 1, wherein parameters of equipment of an alternating current power grid and a direct current transmission main circuit connected with a rectification converter station and an inversion converter station in the hybrid extra-high voltage direct current transmission system are determined, and a second simulation model of the alternating current power grid and the direct current transmission main circuit connected with the rectification converter station and the inversion converter station is built according to the parameters of the equipment; the specific implementation steps are as follows:
Obtaining equipment parameters and tide data of a typical grid structure of an alternating current power grid connected with a rectification converter station and an inversion converter station of a hybrid extra-high voltage direct current power transmission system;
According to the equipment parameters and the tide data of a typical grid structure of the alternating current power grid, obtaining equivalent parameters of the alternating current power grid connected with a rectification converter station and an inversion converter station of the hybrid extra-high voltage direct current power transmission system by adopting a network multiport equivalent calculation method, and respectively constructing a first sub-simulation model corresponding to the alternating current power grid connected with the rectification converter station and a second sub-simulation model corresponding to the alternating current power grid connected with the inversion converter station according to the equivalent parameters and a large-step modeling method;
Parameters of all equipment except a voltage source type converter unit in a direct current transmission main circuit in the hybrid extra-high voltage direct current transmission system are obtained, and a third sub-simulation model corresponding to the direct current transmission main circuit in the hybrid extra-high voltage direct current transmission system is built according to the parameters of all the equipment and by using a large-step modeling method;
Parameters of a voltage source type converter unit in the hybrid extra-high voltage direct current transmission system are obtained, and a fourth sub-simulation model corresponding to a direct current transmission main loop in the hybrid extra-high voltage direct current transmission system is constructed according to the parameters of the voltage source type converter unit and by using a small step modeling method;
And connecting the first sub-simulation model, the second sub-simulation model, the third sub-simulation model and the fourth sub-simulation model according to the principle that an alternating current side is connected through an alternating current circuit or an alternating current transformer and a direct current side is connected through a reactor or a direct current circuit, so as to obtain a second simulation model of the primary alternating current power grid and the direct current transmission main circuit.
5. The simulation modeling method of the hybrid extra-high voltage direct current transmission system according to claim 4, wherein in the first sub-simulation model, each port of an alternating current power grid connected with a rectifying converter station is simulated by adopting an equivalent voltage source with adjustable internal potential, the actual strength of the alternating current power grid is reflected by adopting equivalent internal impedance, and each port is connected through transimpedance;
in the second sub-simulation model, each port of an alternating current power grid connected with an inversion converter station is simulated by adopting an equivalent voltage source with adjustable internal potential, the actual intensity of the alternating current power grid is reflected by adopting equivalent internal impedance, and each port is connected through mutual impedance.
6. The simulation modeling method of the hybrid extra-high voltage direct current transmission system according to claim 4, wherein the large step modeling method is a simulation modeling method with a simulation step of 50 microseconds or more; the small-step modeling method is a simulation modeling method with a simulation step length of 5 microseconds or less.
7. The hybrid extra-high voltage direct current transmission system simulation modeling method according to any one of claims 1 to 6, wherein the data interface module is a digital and analog hardware interface board or device, or a digital and analog software interface module.
8. The hybrid extra-high voltage direct current transmission system simulation modeling method according to claim 1, further comprising: building an actual hybrid extra-high voltage direct current transmission system according to a fixed die ratio through an impedance matching principle to obtain a dynamic simulation real system of the hybrid extra-high voltage direct current transmission system;
And verifying the simulation model of the hybrid extra-high voltage direct current transmission system through a dynamic simulation real system of the hybrid extra-high voltage direct current transmission system.
9. The simulation modeling method of the hybrid extra-high voltage direct current transmission system according to claim 8, wherein the principle of impedance matching comprises:
The actual alternating current impedance and the actual direct current impedance of the hybrid extra-high voltage direct current transmission system are respectively equal to the alternating current impedance and the direct current impedance of a dynamic simulation real system of the hybrid extra-high voltage direct current transmission system;
The actual alternating voltage and the actual alternating current of the hybrid extra-high voltage direct current transmission system are respectively in a certain proportion with the alternating voltage and the alternating current of a dynamic simulation true system of the hybrid extra-high voltage direct current transmission system;
The actual direct current voltage and the actual direct current of the hybrid extra-high voltage direct current transmission system are respectively in a certain proportion with the direct current voltage and the direct current of a dynamic simulation real system of the hybrid extra-high voltage direct current transmission system.
10. The simulation modeling device of the hybrid extra-high voltage direct current transmission system comprises a rectification converter station, an alternating current power grid connected with an inversion converter station, a direct current transmission main loop and a controlled system; the direct-current transmission main loop is a controlled object and comprises at least one group of voltage source type converter units and at least one group of power grid commutation converter units; characterized in that the modeling means comprises:
The system comprises a first simulation module, a second simulation module and a control module, wherein the first simulation module is used for determining a control object of a controlled system in a hybrid extra-high voltage direct current transmission system and establishing a first simulation model of the controlled system according to the control object;
The second simulation module is used for determining parameters of all equipment of an alternating current power grid and a direct current transmission main circuit connected with a rectification converter station and an inversion converter station in the hybrid extra-high voltage direct current transmission system, and establishing a second simulation model of the alternating current power grid and the direct current transmission main circuit connected with the rectification converter station and the inversion converter station according to the parameters of all the equipment;
And the connection module is used for connecting the first simulation model and the second simulation model through the data interface module to obtain the simulation model of the hybrid extra-high voltage direct current transmission system.
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