Simulation model of controllable commutation converter and simulation method and system thereof

Abstract

The invention provides a simulation model of a controllable commutation converter and a simulation method and system thereof. The simulation model comprises a rectification side model, a controllable commutation converter model, an inversion side model and a control system model. The rectification side model, the controllable commutation converter model and the inversion side model are connected in sequence; the control system model is respectively connected with the rectification side model and the controllable commutation converter model; wherein the controllable commutation converter model runs in a simulation machine of a first time step, and the rectification side model, the inversion side model and the control system model respectively run in simulation machines of a second time step; the duration of the second time step length is greater than the first time step length, the controllable commutation converter model is operated in the simulation machine with the smaller step length duration, and the rectification side model, the inversion side model and the control system model are operated in the simulation machine with the larger step length duration, so that the limitation caused by the step length during simulation is overcome, and the simulation accuracy is improved. And the precision requirement of the controllable power grid commutation converter is further met.

Description

Technical Field

[0001] The present invention belongs to the technical field of power system automation, and in particular relates to a simulation model of a controllable phase-commutating converter and a simulation method and system thereof. Background Art

[0002] With the vigorous development of new energy, a large number of high-voltage DC lines have been built to complete large-scale transmission of new energy to meet the huge load demand. However, in the high-voltage DC line, there is a problem of multiple feeds at the receiving end of DC transmission, and commutation failure occurs frequently, affecting normal power transmission. In order to fundamentally solve the problem of commutation failure, a controllable grid commutation converter currently has engineering feasibility and is about to be used in engineering. Therefore, the work of testing the converter is imminent.

[0003] Real-time simulation is a necessary means to study and test converters. With the development of power electronics technology, the switching frequency of power electronic devices in converters has gradually increased. The traditional CPU-based real-time simulation platform can no longer meet the simulation step requirements of high-frequency power electronic devices. Although the FPGA platform can be used for real-time simulation with small step lengths, the discrete mathematical modeling of the entire system will occupy a large amount of FPGA hardware resources, and the discrete modeling will increase the difficulty of real-time simulation.

[0004] At present, the construction of controllable phase-commutated converter simulation models all uses a real-time simulation platform of a CPU. In this case, due to the limitation of the step size, the controllable phase-commutated converter cannot meet the accuracy requirements of the controllable grid phase-commutated converter during simulation. Summary of the invention

[0005] In order to overcome the above-mentioned deficiencies of the prior art, the present invention proposes a simulation model of a controllable commutation converter, including a rectifier side model, a controllable commutation converter model, an inverter side model and a control system model;

[0006] The rectifier side model, the controllable commutation converter model and the inverter side model are connected in sequence; the control system model is connected to the rectifier side model and the controllable commutation converter model respectively;

[0007] The controllable commutation converter model runs in a simulator of a first time step, and the rectifier side model, the inverter side model and the control system model respectively run in a simulator of a second time step;

[0008] The duration of the second time step is greater than that of the first time step;

[0009] The rectifier side model is used to convert AC into DC and provide electrical quantities; the inverter side model is used to receive the electrical quantities output by the controllable commutation converter model; the controllable commutation converter model is used to calculate the electrical quantities of the rectifier side model and the inverter side model to obtain calculation results; the control system model is used to control the rectifier side model and the controllable commutation converter model; the rectifier side model, the controllable commutation converter model and the inverter side model are updated respectively according to the calculation results, thereby completing a simulation cycle of the simulation model.

[0010] Preferably, the rectifier side model includes: a rectifier side power grid model, a rectifier side thyristor converter model and a DC line model;

[0011] The rectifier-side power grid model, the rectifier-side thyristor converter model and the DC line model are connected in sequence; the DC line model is connected to the controllable commutation converter model; the control system model is connected to the rectifier-side thyristor converter model;

[0012] The rectifier side grid model is used to provide AC electrical quantity; the rectifier side thyristor converter model is used to convert AC electrical quantity into DC electrical quantity; the DC line model is used to output DC electrical quantity; the control system model is used to control the rectifier side thyristor converter model.

[0013] Preferably, the control system model includes a rectifier-side thyristor converter control model and a controllable commutation converter control model;

[0014] The rectifier-side thyristor converter control model is connected to the rectifier-side thyristor converter model; the controllable commutation converter control model is connected to the controllable commutation converter model;

[0015] The rectifier-side thyristor converter control model is used to control the rectifier-side thyristor converter model, and the controllable commutation converter control model is used to control the controllable commutation converter model.

[0016] Preferably, the simulation machine operated by the rectifier side model, the simulation machine operated by the controllable commutation converter model and the simulation machine operated by the inverter side model are connected in sequence by means of optical fiber communication; the simulation machine operated by the control system model is respectively connected to the simulation machine operated by the rectifier side model and the simulation machine operated by the controllable commutation converter model by means of optical fiber communication.

[0017] Preferably, the simulation machine for the first time step is an FPGA simulation machine, and the simulation machine for the second time step is a CPU simulation machine.

[0018] Based on the same inventive concept, the present invention also proposes a simulation method based on a simulation model of a controllable commutation converter, comprising:

[0019] Acquire the AC side electrical quantities and the DC side electrical quantities of the rectifier side model in the simulation machine of the simulation model at the second time step;

[0020] Obtain the electrical quantity of the current inverter-side model in the simulation machine of the simulation model at the second time step, combine it with the DC-side electrical quantity of the rectifier-side model, calculate it through the controllable commutation converter model in the simulation machine of the first time step, and update the inverter-side model according to the calculation result;

[0021] The running state of the simulation model is judged according to the calculation result, a trigger signal corresponding to the running state is generated, and the rectifier side model and the controllable commutation converter model are updated through the trigger signal, thereby completing one simulation cycle of the simulation model;

[0022] The simulation model is a simulation model having the above-mentioned controllable commutation converter simulation model architecture.

[0023] Preferably, the AC side electrical quantities of the rectifier side model are the electrical quantities of the rectifier side power grid model; and the DC side electrical quantities of the rectifier side model are the electrical quantities of the DC line model.

[0024] Preferably, before obtaining the AC side electrical quantities and the DC side electrical quantities of the rectifier side model in the simulation machine of the second time step of the simulation model, the method further includes:

[0025] The simulation model is run according to the preset initial values ​​of the rectifier side model, the controllable commutation converter model, the inverter side model and the control system model in the simulation model.

[0026] Based on the same inventive concept, the present invention further proposes a simulation system based on a simulation model of a controllable commutation converter, comprising:

[0027] A data acquisition module, used for acquiring AC-side electrical quantities and DC-side electrical quantities of a rectifier-side model in a simulation machine of a simulation model at a second time step;

[0028] A data calculation module, used to obtain the electrical quantity of the current inverter-side model of the simulation model in the simulation machine at the second time step, combine the DC-side electrical quantity of the rectifier-side model, calculate through the controllable commutation converter model of the simulation model in the simulation machine at the first time step, and update the inverter-side model according to the calculation result;

[0029] A model updating module, used for judging the running state of the simulation model according to the calculation result, generating a trigger signal corresponding to the running state, and updating the rectifier side model and the controllable commutation converter model through the trigger signal, thereby completing a simulation cycle of the simulation model;

[0030] The simulation model is a simulation model having the above-mentioned controllable commutation converter simulation model architecture.

[0031] Preferably, the AC side electrical quantities of the rectifier side model in the data acquisition module are the electrical quantities of the rectifier side power grid model; the DC side electrical quantities of the rectifier side model in the data acquisition module are the electrical quantities of the DC line model.

[0032] Preferably, the system further comprises an initial operation module, which is used to execute, before calling the data acquisition module:

[0033] The simulation model is run according to the preset initial values ​​of the rectifier side model, the controllable commutation converter model, the inverter side model and the control system model in the simulation model.

[0034] Compared with the closest prior art, the present invention has the following beneficial effects:

[0035] The present invention provides a simulation model of a controllable commutation converter and a simulation method and system thereof, comprising a rectifier side model, a controllable commutation converter model, an inverter side model and a control system model; the rectifier side model, the controllable commutation converter model and the inverter side model are connected in sequence; the control system model is connected to the rectifier side model and the controllable commutation converter model respectively; wherein the controllable commutation converter model runs in a simulation machine of a first time step, and the rectifier side model, the inverter side model and the control system model are respectively run in a simulation machine of a second time step; the duration of the second time step is greater than The first time step; the controllable commutation converter model calculates the electrical quantities of the rectifier side model and the inverter side model to obtain calculation results, and the rectifier side model, the controllable commutation converter model and the inverter side model are updated according to the calculation results, thereby completing a simulation cycle of the simulation model. The present invention runs the controllable commutation converter model in a simulation machine with a smaller step time, and runs the rectifier side model, the inverter side model and the control system model in a simulation machine with a larger step time, thereby overcoming the limitations caused by the step size during simulation, and thus meeting the accuracy requirements of the controllable power grid commutation converter. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] Figure 1 A schematic diagram of the structure of a controllable commutation converter simulation model architecture provided by the present invention;

[0037] Figure 2 A schematic diagram of the topological structure of the controllable grid phase-commutation converter of the present invention;

[0038] Figure 3 It is a structural schematic diagram of the controllable commutation converter simulation model architecture using FPGA and CPU simulator of the present invention;

[0039] Figure 4 A schematic flow chart of a simulation method based on a controllable commutation converter simulation model provided by the present invention;

[0040] Figure 5 It is a configuration diagram of the real-time simulation of the present invention;

[0041] Figure 6 It is a schematic diagram of the process flow of real-time simulation of the present invention;

[0042] Fig. 7A It is a schematic diagram of the waveform of the main full-control valve of the large-step simulation model of the present invention in a steady state;

[0043] Figure 7B A schematic diagram of the waveform of the main full-control valve of the controllable commutation converter simulation model in steady state of the present invention;

[0044] Fig. 8A It is a schematic diagram of the waveform ratio of the main full-control valve of the large-step simulation model of the present invention under a fault scenario;

[0045] Figure 8B A schematic diagram of the waveform of the main full-control valve of the controllable commutation converter simulation model under a fault scenario of the present invention;

[0046] Fig. 9 A schematic diagram of the structure of a simulation system based on a controllable commutation converter simulation model provided by the present invention;

[0047] Fig.10 for Figure 3 A magnified view of the LCC control system;

[0048] Fig.11 for Figure 3 A magnified view of the CLCC control system. DETAILED DESCRIPTION

[0049] The specific implementation modes of the present invention are further described in detail below with reference to the accompanying drawings.

[0050] Embodiment 1:

[0051] The present invention provides a controllable phase-commutated converter simulation model architecture, such as Figure 1 As shown, it includes a rectifier side model, a controllable commutation converter model, an inverter side model and a control system model;

[0052] The rectifier side model, the controllable commutation converter model and the inverter side model are connected in sequence; the control system model is connected to the rectifier side model and the controllable commutation converter model respectively;

[0053] The controllable commutation converter model runs in a simulator of a first time step, and the rectifier side model, the inverter side model and the control system model respectively run in a simulator of a second time step;

[0054] The duration of the second time step is greater than that of the first time step;

[0055] The rectifier side model is used to convert AC into DC and provide electrical quantities; the inverter side model is used to receive the electrical quantities output by the controllable commutation converter model; the controllable commutation converter model is used to calculate the electrical quantities of the rectifier side model and the inverter side model to obtain calculation results; the control system model is used to control the rectifier side model and the controllable commutation converter model; the rectifier side model, the controllable commutation converter model and the inverter side model are updated respectively according to the calculation results, thereby completing a simulation cycle of the simulation model.

[0056] First, we introduce the topology of the phase-commutated converter in the controllable grid, such as Figure 2 As shown in FIG. 1 , a controllable grid-commutated converter topology structure of a hybrid thyristor and IGBT (insulated gate bipolar transistor) device is shown. The topology consists of a main branch and an auxiliary branch in parallel, both branches are composed of a thyristor valve and an IGBT valve in series, and the thyristor element and the IGBT element are respectively connected in parallel with an RC damping and an RCD damping circuit to dynamically balance the voltage across each valve.

[0057] The main and auxiliary branches are composed of high thyristors and fully controlled valves. Among them: the thyristor parallel RC damping circuit is used for voltage equalization to avoid thyristor damage; because the voltage resistance of IGBT is much smaller than that of thyristor, the RC damping circuit is connected in parallel at both ends of the IGBT for dynamic voltage equalization and the parallel diode is used for voltage resistance. In terms of connection method, the connection method of the RC resistor-capacitor circuit is the same as that of the traditional high-voltage direct current transmission converter valve; this topology contains diodes and lightning arresters. The lightning arrester is connected in parallel at both ends of the auxiliary branch IGBT to avoid device damage during the main-auxiliary switching. The diode is connected in parallel with the resistor of the RC resistor-capacitor circuit, and its conduction direction is opposite to that of the IGBT, which plays a role in protecting the IGBT during the voltage reversal process.

[0058] When the controllable commutation converter is used, first, V1, V2 and V3 are triggered at the same time. Since V4 is in the off stage, the branch where V1 and V2 are located is in the on stage. This stage is the same as the mechanism of the traditional high-voltage direct current transmission method. Then, after V1 and V2 are turned on for 120° or after a fault in the AC system is detected, commutation is performed. During the commutation period, V2 is turned off, and the current gradually transfers to the branch where V3 and V4 are located; after the commutation process is completed, the main branch current is zero at this time, V1 is subjected to reverse voltage and enters the blocking recovery period, at which time V3 and V4 continue to conduct; after the natural commutation is completed or the fault is cleared, V3 and V4 are turned off, and the converter waits for the next trigger cycle.

[0059] Next, we introduce the controllable commutation converter simulation model architecture. The simulation machine for the first time step is an FPGA simulation machine (small step simulation platform), and the simulation machine for the second time step is a CPU simulation machine (large step simulation platform). In order to make full use of the advantages of FPGA and CPU, Figure 3 As shown, the upper leftmost is the rectifier side model, the upper rightmost is the inverter side model, the upper middle is the controllable commutation converter model, and the two lower ones are control systems, such as Figure 3 Each part of the model is divided according to the requirements of the real-time simulation step size: the controllable power grid phase-commutation converter model that only requires a small step size during simulation is used as a small step size simulation system and simulated through the FPGA simulation platform; the remaining electrical part is used as a large step size simulation system and simulated through the CPU platform. The two platforms are combined to achieve heterogeneous multi-rate real-time simulation.

[0060] The real-time simulation effect depends on the coordination between the simulation machines and the transmission of signals. The model can adopt the Cigre_Benchmark DC transmission model. According to different functions, it can be divided into: (1) rectifier side grid, rectifier side thyristor converter (LCC) and DC line; (2) controllable grid commutation converter; (3) inverter side AC grid of controllable grid commutation converter; (4) LCC control system, such as Fig.10 As shown; (5) CLCC control system, such as Fig.11 As shown. To simulate the operation environment of the project, the above parts are modeled, and (1), (3)-(5) are run in different CPUs, and (2) is run in FPGA. The above parts are placed in different simulation machines, and optical fiber communication is used between simulation machines.

[0061] The simulation machine operated by the rectifier side model, the simulation machine operated by the controllable commutation converter model and the simulation machine operated by the inverter side model are connected in sequence by means of optical fiber communication; the simulation machine operated by the control system model is respectively connected to the simulation machine operated by the rectifier side model and the simulation machine operated by the controllable commutation converter model by means of optical fiber communication. In asynchronous communication simulation, it is necessary to focus on minimizing communication delay to reduce its impact on the accuracy of joint simulation results. The use of optical fiber communication can avoid the problem of communication delay.

[0062] Wherein, the rectifier side model includes: rectifier side power grid model ( Figure 3 The power supply part in the rectifier side model), the thyristor converter model on the rectifier side ( Figure 3 The transistor part in the rectifier side model) and the DC line model ( Figure 3 The tower part in the rectifier side model); the rectifier side power grid model, the rectifier side thyristor converter model and the DC line model are connected in sequence; the DC line model is connected to the controllable commutation converter model; the control system model is connected to the rectifier side thyristor converter model; the rectifier side power grid model is used to provide AC electrical quantity; the rectifier side thyristor converter model is used to convert AC electrical quantity into DC electrical quantity; the DC line model is used to output DC electrical quantity; the control system model is used to control the rectifier side thyristor converter model.

[0063] The control system model includes a rectifier-side thyristor converter control model ( Figure 3 LCC control system) and controllable commutated converter control model ( Figure 3 CLCC control system); the rectifier-side thyristor converter control model is connected to the rectifier-side thyristor converter model; the controllable commutation converter control model is connected to the controllable commutation converter model; the rectifier-side thyristor converter control model is used to control the rectifier-side thyristor converter model, and the controllable commutation converter control model is used to control the controllable commutation converter model.

[0064] In summary, the present invention adopts a simulation architecture based on FPGA+CPU. If only the FPGA platform is used for real-time simulation, the discrete mathematical modeling of the entire system will occupy a large amount of FPGA hardware resources, and the discrete modeling will increase the difficulty of real-time simulation. The CPU real-time simulation platform is compatible with the Simulink model and has the characteristics of easy control and data observation.

[0065] Embodiment 2:

[0066] Based on the same inventive concept, the present invention provides a simulation method based on a controllable commutation converter simulation model, such as Figure 4 As shown, the following steps are included:

[0067] Step 1: obtaining the AC side electrical quantities and the DC side electrical quantities of the rectifier side model in the simulation machine of the simulation model at the second time step;

[0068] Step 2: Obtain the current electrical quantity of the inverter side model in the simulation machine of the second time step of the simulation model, combine it with the DC side electrical quantity of the rectifier side model, calculate it through the controllable commutation converter model in the simulation machine of the first time step of the simulation model, and update the inverter side model according to the calculation result;

[0069] Step 3: judging the running state of the simulation model according to the calculation result, generating a trigger signal corresponding to the running state, and updating the rectifier side model and the controllable commutation converter model through the trigger signal, thereby completing a simulation cycle of the simulation model;

[0070] The simulation model is a simulation model having the above-mentioned controllable commutation converter simulation model architecture.

[0071] Among them, the AC side electrical quantities of the rectifier side model are the electrical quantities of the rectifier side power grid model; and the DC side electrical quantities of the rectifier side model are the electrical quantities of the DC line model.

[0072] Before step 1, the method further includes: running the simulation model according to the preset initial values ​​of the rectifier side model, the controllable commutation converter model, the inverter side model and the control system model in the simulation model.

[0073] Combination Figure 3 ,like Figure 5 Shown and Figure 6 As shown in the figure, the simulation model is set up using the host computer. First, the FPGA+CPU simulation model runs according to the initial value set by the host computer. After that, the simulation timing is performed, and the rectifier-side power grid model of the CPU sends the calculated LCC DC-side electrical quantities to the FPGA through optical fiber, and the LCC AC-side and DC-side electrical quantities are sent to the LCC control system model of the CPU. Then, the FPGA receives the LCC DC-side electrical quantities and the inverter-side electrical quantities of the controllable power grid phase-commutation converter and performs high-speed calculations, and sends the calculation results to the controllable power grid phase-commutation converter control model and inverter-side power grid model of the CPU. After that, each control model of the CPU judges the operating status of the system and generates corresponding trigger signals to send back to the LCC model of the CPU and the controllable power grid phase-commutation converter model of the FPGA. Finally, the CPU and FPGA models are updated to enter the next simulation cycle.

[0074] The present invention can improve the signal transmission efficiency between various simulation machines, avoid signal loss, and can simulate the operating characteristics of various valves of the controllable power grid phase-commutating converter to the greatest extent.

[0075] In the present invention, the communication protocol adopted between the simulation machines is Aurora communication; the host computer uses the Ethernet UDP protocol to communicate with the CPU and FPGA, and can monitor the CPU model, and the interface protocol is the RGMII protocol.

[0076] In order to verify the correctness of the present invention, a CPU large-step real-time simulation model and a real-time simulation model based on a mixture of CPU and FPGA were built based on the Cigre_Benchmark DC transmission model for comparative verification.

[0077] Example (1): Steady-state scenario verification

[0078] During stable operation, the simulation step length of the large-step simulation model is 50us, and the system adopts a startup strategy. In the simulation model of the present invention, the FPGA internal model is 4us, and the CPU model is 50us. Fig. 7A and Figure 7B As shown in the figure, it can be seen that compared with the large-step-size simulation model, the simulation model of the present invention reflects more high-frequency information and is more consistent with the actual electrical characteristics, which proves the accuracy of the simulation model of the present invention.

[0079] Case study (2): Fault scenario verification

[0080] After the real-time simulation model runs stably, the A-phase grounding fault is set to occur at 7s on the CLCC AC side, and the duration is 0.1s. The simulation waveform is as follows: Fig. 8A and Figure 8B As can be seen from the figure, the convergence speed of the simulation model of the present invention is better than that of the large step-size model, and is more consistent with engineering practice.

[0081] The method and specific implementation form proposed in this invention are compared with the existing real-time simulation method of large-step-size model based on PCI-E. The results show that this method is effective and practical. This method can also be used for simulation verification of other new power electronic topologies, with strong generalizability and suitable for various laboratory environments.

[0082] Embodiment 3:

[0083] Based on the same inventive concept, the present invention also provides a simulation system based on a controllable commutation converter simulation model, such as Fig. 9 As shown, including:

[0084] A data acquisition module, used for acquiring AC-side electrical quantities and DC-side electrical quantities of a rectifier-side model in a simulation machine of a simulation model at a second time step;

[0085] A data calculation module, used to obtain the current electrical quantity of the inverter side model of the simulation model in the simulation machine at the second time step, combine the DC side electrical quantity of the rectifier side model, calculate through the controllable commutation converter model of the simulation model in the simulation machine at the first time step, and update the inverter side model according to the calculation result;

[0086] A model updating module, used for judging the running state of the simulation model according to the calculation result, generating a trigger signal corresponding to the running state, and updating the rectifier side model and the controllable commutation converter model through the trigger signal, thereby completing a simulation cycle of the simulation model;

[0087] The simulation model is a simulation model having the above-mentioned controllable commutation converter simulation model architecture.

[0088] The AC side electrical quantities of the rectifier side model in the data acquisition module are the electrical quantities of the rectifier side power grid model; the DC side electrical quantities of the rectifier side model in the data acquisition module are the electrical quantities of the DC line model.

[0089] The system further includes an initial operation module, which is used to execute the following contents before calling the data acquisition module for execution (before the data acquisition module is executed):

[0090] The simulation model is run according to the preset initial values ​​of the rectifier side model, the controllable commutation converter model, the inverter side model and the control system model in the simulation model.

[0091] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit its protection scope. Although the present invention has been described in detail with reference to the above embodiments, ordinary technicians in the field should understand that after reading the present invention, those skilled in the art can still make various changes, modifications or equivalent substitutions to the specific implementation methods of the application, but these changes, modifications or equivalent substitutions are all within the protection scope of the claims to be approved.

Claims

1. A simulation model of a controllable phase-commutated converter, characterized in that: Including rectifier side model, controllable commutation converter model, inverter side model and control system model; The rectifier side model, the controllable commutation converter model and the inverter side model are connected in sequence; the control system model is connected to the rectifier side model and the controllable commutation converter model respectively; The controllable commutation converter model runs in a simulator of a first time step, and the rectifier side model, the inverter side model and the control system model respectively run in a simulator of a second time step; The duration of the second time step is greater than that of the first time step; The rectifier side model is used to convert AC into DC and provide electrical quantities; the inverter side model is used to receive the electrical quantities output by the controllable commutation converter model; the controllable commutation converter model is used to calculate the electrical quantities of the rectifier side model and the inverter side model to obtain calculation results; the control system model is used to control the rectifier side model and the controllable commutation converter model; the rectifier side model, the controllable commutation converter model and the inverter side model are updated respectively according to the calculation results, thereby completing a simulation cycle of the simulation model.

2. The simulation model according to claim 1, characterized in that: The rectifier side model includes: a rectifier side power grid model, a rectifier side thyristor converter model and a DC line model; The rectifier-side power grid model, the rectifier-side thyristor converter model and the DC line model are connected in sequence; the DC line model is connected to the controllable commutation converter model; the control system model is connected to the rectifier-side thyristor converter model; The rectifier side grid model is used to provide AC electrical quantity; the rectifier side thyristor converter model is used to convert AC electrical quantity into DC electrical quantity; the DC line model is used to output DC electrical quantity; the control system model is used to control the rectifier side thyristor converter model.

3. The simulation model according to claim 2, characterized in that: The control system model includes a rectifier-side thyristor converter control model and a controllable commutation converter control model; The rectifier-side thyristor converter control model is connected to the rectifier-side thyristor converter model; the controllable commutation converter control model is connected to the controllable commutation converter model; The rectifier-side thyristor converter control model is used to control the rectifier-side thyristor converter model, and the controllable commutation converter control model is used to control the controllable commutation converter model.

4. The simulation model according to claim 1, characterized in that: The simulation machine operated by the rectifier side model, the simulation machine operated by the controllable commutation converter model and the simulation machine operated by the inverter side model are connected in sequence by optical fiber communication; the simulation machine operated by the control system model is respectively connected to the simulation machine operated by the rectifier side model and the simulation machine operated by the controllable commutation converter model by optical fiber communication.

5. The simulation model according to claim 1, characterized in that: The simulator for the first time step is an FPGA simulator, and the simulator for the second time step is a CPU simulator.

6. A simulation method based on a simulation model of a controllable phase-commutated converter, characterized in that: include: Acquire the AC side electrical quantities and the DC side electrical quantities of the rectifier side model in the simulation machine of the simulation model at the second time step; Obtain the electrical quantity of the current inverter-side model in the simulation machine of the simulation model at the second time step, combine it with the DC-side electrical quantity of the rectifier-side model, calculate it through the controllable commutation converter model in the simulation machine of the first time step, and update the inverter-side model according to the calculation result; The running state of the simulation model is judged according to the calculation result, a trigger signal corresponding to the running state is generated, and the rectifier side model and the controllable commutation converter model are updated through the trigger signal, thereby completing one simulation cycle of the simulation model; The simulation model is a simulation model having a controllable commutation converter simulation model architecture as described in any one of claims 1-5.

7. The method according to claim 6, characterized in that The AC side electrical quantities of the rectifier side model are the electrical quantities of the rectifier side power grid model; the DC side electrical quantities of the rectifier side model are the electrical quantities of the DC line model.

8. The method according to claim 6, characterized in that Before obtaining the AC side electrical quantity and the DC side electrical quantity of the rectifier side model in the simulation machine of the second time step of the simulation model, the method further includes: The simulation model is run according to the preset initial values ​​of the rectifier side model, the controllable commutation converter model, the inverter side model and the control system model in the simulation model.

9. A simulation system based on a simulation model of a controllable phase-commutated converter, characterized in that: include: A data acquisition module, used for acquiring AC-side electrical quantities and DC-side electrical quantities of a rectifier-side model in a simulation machine of a simulation model at a second time step; A data calculation module, used to obtain the electrical quantity of the current inverter-side model of the simulation model in the simulation machine at the second time step, combine the DC-side electrical quantity of the rectifier-side model, calculate through the controllable commutation converter model of the simulation model in the simulation machine at the first time step, and update the inverter-side model according to the calculation result; A model updating module, used for judging the running state of the simulation model according to the calculation result, generating a trigger signal corresponding to the running state, and updating the rectifier side model and the controllable commutation converter model through the trigger signal, thereby completing a simulation cycle of the simulation model; The simulation model is a simulation model having a controllable commutation converter simulation model architecture as described in any one of claims 1-5.

10. The system according to claim 9, characterized in that The AC side electrical quantities of the rectifier side model in the data acquisition module are the electrical quantities of the rectifier side power grid model; the DC side electrical quantities of the rectifier side model in the data acquisition module are the electrical quantities of the DC line model.

11. The system according to claim 9, characterized in that The system further includes an initial operation module, which is used to execute, before calling the data acquisition module: The simulation model is run according to the preset initial values ​​of the rectifier side model, the controllable commutation converter model, the inverter side model and the control system model in the simulation model.

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