A hybrid electromechanical transient-electromagnetic transient simulation method and system

Abstract

The present invention relates to an electromechanical transient-electromagnetic transient hybrid simulation method and system, comprising: connecting a power compensation device with one end grounded to a bidirectionally open simulation interface of a hybrid simulation model; closing a controlled switch in the power compensation device and starting simulation; when the output power of a clamping voltage source in the power compensation device is not less than a preset threshold value within a preset duration, the simulation fails; otherwise, turning off the controlled switch of the power compensation device and outputting a simulation result. The technical solution provided by the present invention connects a controllable power compensation device at a bidirectionally open simulation interface, and decouples the electromechanical model and the electromagnetic model during the simulation startup phase through the power compensation effect of the clamping voltage source of the power compensation device, so that the electromechanical model is not affected by the unstable state of the electromagnetic model, and the electromagnetic model can quickly enter a steady state with the support of the clamping voltage source; thereby, the electromechanical transient-electromagnetic transient hybrid simulation is carried out smoothly.

Description

Technical Field

[0001] The present invention relates to the field of simulation and calculation of power systems, and in particular to a hybrid electromechanical transient-electromagnetic transient simulation method and system. Background Art

[0002] There are great differences between the two types of simulation, namely, electromagnetic transient simulation and electromechanical transient simulation of power systems, in terms of calculation step, simulation time range, variable representation, mathematical model, etc.

[0003] The difference is that electromagnetic transient simulation usually describes the fast transient characteristics of the system with a process duration of nanoseconds, microseconds, and milliseconds, and the calculation step is generally 20-200 microseconds, with a typical calculation step of 50 microseconds, while electromechanical transient simulation usually describes the transient stability characteristics of the system with a process duration of several seconds to tens of seconds, with a typical calculation step of 10 milliseconds. The typical calculation step of electromagnetic transient and electromechanical transient simulation differs by 200 times.

[0004] Electromagnetic transient simulation uses ABC three-phase instantaneous values ​​to describe the system's three-phase asymmetry, waveform distortion, harmonic superposition and other characteristics; electromechanical transient simulation is based on the assumption of industrial frequency sinusoidal waves, and the system is converted from a three-phase network into mutually decoupled positive, negative, and zero-sequence networks through linear transformation for separate calculations. The system variables are represented by fundamental wave phasors.

[0005] The electromagnetic transient simulation component model is described by differential equations or partial differential equations composed of capacitors, inductors and other components that are widely present in the network; while in electromechanical transient simulation, the system component model is linearly represented by phasor equations except for dynamic components such as generators. Compared with the electromagnetic transient model, the electromechanical transient simulation model has been simplified to a certain extent according to the simulation conditions.

[0006] As mentioned above, the electromechanical transient simulation process and the electromagnetic transient simulation process of the power system are two processes characterized by different mathematical models and have different time constants, and there are great differences in simulation principles and methods. In order to integrate the electromechanical transient simulation of large-scale complex power systems and the electromagnetic transient simulation of local systems in one process, it is necessary to adopt interface technology to achieve electromagnetic transient and electromechanical transient hybrid simulation of large-scale power systems by exchanging the calculation information of the electromechanical transient network and the calculation information of the electromagnetic transient network at any time during the simulation process.

[0007] The electromechanical transient-electromagnetic transient hybrid simulation interface technology adopts the method of equalizing the two networks. When calculating the electromagnetic transient network, the electromechanical transient network is equalized; when calculating the electromechanical transient network, the electromagnetic transient network is equalized.

[0008] Since the electromechanical transient network is a three-sequence phasor network, and the electromagnetic transient network is a three-phase instantaneous value network, it is also necessary to perform sequence-phase transformation and instantaneous quantity-phasor transformation. In addition, the calculation step of the electromechanical transient network is large, while the calculation step of the electromagnetic transient network is small. Therefore, the data exchange between the electromechanical transient network and the electromagnetic transient network is carried out in units of electromechanical transient step length.

[0009] Based on the above characteristics of the hybrid simulation interface technology, the electromechanical transient-electromagnetic transient hybrid simulation model of the simulation interface is difficult to complete in the simulation process. The reason is that the electromagnetic model of the electromechanical transient-electromagnetic transient hybrid simulation model is not stable at startup, and it interacts with the electromechanical model of the electromechanical transient-electromagnetic transient hybrid simulation model, resulting in large fluctuations in the interactive data at the simulation interface, which in turn causes system instability.

[0010] Currently, no method has been proposed to solve the above problems. Summary of the invention

[0011] In view of the deficiencies in the prior art, the purpose of the present invention is to provide an electromechanical transient-electromagnetic transient hybrid simulation method, which connects a controllable power compensation device at a bidirectionally open simulation interface, and realizes decoupling of the electromechanical model and the electromagnetic model during the simulation startup phase through the power compensation effect of the clamping voltage source of the power compensation device, so that the electromechanical model is not affected by the unstable state of the electromagnetic model, and the electromagnetic model can quickly enter a steady state with the support of the clamping voltage source; when the clamping voltage source reaches a small power output, it is automatically cut off, and the bidirectionally open simulation interface independently undertakes the data interaction between the electromechanical model and the electromagnetic model, thereby enabling the smooth progress of the electromechanical transient-electromagnetic transient hybrid simulation.

[0012] The purpose of the present invention is achieved by adopting the following technical solutions:

[0013] The present invention provides an electromechanical transient-electromagnetic transient hybrid simulation method, the improvement of which lies in that the method comprises:

[0014] Connect a power compensation device with one end grounded to a bidirectionally open simulation interface of a pre-built AC / DC power grid electromechanical transient-electromagnetic transient hybrid simulation model;

[0015] Closing the controlled switch in the power compensation device, and performing electromagnetic transient simulation and electromechanical transient simulation on the electromagnetic model and the electromechanical model in the hybrid simulation model respectively;

[0016] When the output power of the clamping voltage source in the power compensation device is not less than a preset threshold within a preset duration, the simulation fails, and an unreasonable alarm message of the power flow simulation data setting assigned by the hybrid simulation model is output; otherwise, the controlled switch of the power compensation device is turned off, the simulation continues to the end, and the simulation result is output.

[0017] Preferably, the process of pre-building an AC / DC power grid electromechanical transient-electromagnetic transient hybrid simulation model includes:

[0018] Based on preset operation information and preset power flow constraints, a power flow simulation is performed on a pre-built electromechanical model of an AC or DC power grid to obtain power flow simulation data;

[0019] Building an electromagnetic model corresponding to a preselected area in the AC / DC power grid;

[0020] intercepting an electromechanical model corresponding to a non-preselected area in the AC / DC power grid in the electromechanical model of the AC / DC power grid;

[0021] The electromagnetic model corresponding to the pre-selected area is connected to the busbar with the same name in the electromechanical model corresponding to the non-pre-selected area by using the bidirectionally open simulation interface;

[0022] The power flow simulation data is assigned to the corresponding electromagnetic model of the preselected area and the electromechanical model of the non-preselected area to generate an electromechanical transient-electromagnetic transient hybrid simulation model of the AC / DC power grid.

[0023] Preferably, the connection point between the power compensation device and the simulation interface is located close to the electromagnetic model of the pre-built AC / DC power grid electromechanical transient-electromagnetic transient hybrid simulation model;

[0024] The power compensation device comprises a clamping voltage source and a controlled switch connected in series;

[0025] Among them, the voltage effective value and phase angle of the clamping voltage source are respectively set to the voltage effective value and phase angle of the bus connected to the bidirectional open simulation interface connected to the power compensation device to which it belongs; the clamping voltage source is used to compensate for the power deviation of the bus with the same name in the corresponding electromagnetic model of the preselected area and the electromechanical model corresponding to the non-preselected area at the bidirectional open simulation interface.

[0026] The present invention provides an electromechanical transient-electromagnetic transient hybrid simulation system, the improvement of which lies in that the system comprises:

[0027] A connection module is used to connect a power compensation device with one end grounded to a bidirectionally opened simulation interface of a pre-built AC / DC power grid electromechanical transient-electromagnetic transient hybrid simulation model;

[0028] A closing module, used for closing the controlled switch in the power compensation device, and performing electromagnetic transient simulation and electromechanical transient simulation on the electromagnetic model and the electromechanical model in the hybrid simulation model respectively;

[0029] The output module is used to fail the simulation and output an unreasonable alarm message of the power flow simulation data setting assigned by the hybrid simulation model when the output power of the clamping voltage source in the power compensation device is not less than a preset threshold value within a preset duration; otherwise, turn off the controlled switch of the power compensation device, continue the simulation until the end, and output the simulation result.

[0030] Preferably, the system further comprises a building module for pre-building an electromechanical transient-electromagnetic transient hybrid simulation model of an AC / DC power grid, wherein the building module specifically comprises:

[0031] A power flow simulation unit, used to perform power flow simulation on a pre-built AC / DC power grid electromechanical model based on preset operation information and preset power flow constraints, and obtain power flow simulation data;

[0032] A construction unit, used for constructing an electromagnetic model corresponding to a preselected area in the AC / DC power grid;

[0033] An interception unit, used for intercepting the electromechanical model corresponding to the non-preselected area in the AC / DC power grid in the electromechanical model of the AC / DC power grid;

[0034] A connection unit, used to connect the electromagnetic model corresponding to the preselected area with the busbar with the same name in the electromechanical model corresponding to the non-preselected area by using a bidirectionally open simulation interface;

[0035] The generating unit is used to assign the power flow simulation data to the corresponding electromagnetic model of the preselected area and the corresponding electromechanical model of the non-preselected area, so as to generate an electromechanical transient-electromagnetic transient hybrid simulation model of the AC / DC power grid.

[0036] Preferably, the connection point between the power compensation device and the simulation interface is located close to the electromagnetic model of the pre-built AC / DC power grid electromechanical transient-electromagnetic transient hybrid simulation model;

[0037] The power compensation device comprises a clamping voltage source and a controlled switch connected in series;

[0038] Among them, the voltage effective value and phase angle of the clamping voltage source are respectively set to the voltage effective value and phase angle of the bus connected to the bidirectional open simulation interface connected to the power compensation device to which it belongs; the clamping voltage source is used to compensate for the power deviation of the bus with the same name in the corresponding electromagnetic model of the preselected area and the electromechanical model corresponding to the non-preselected area at the bidirectional open simulation interface.

[0039] Compared with the closest prior art, the present invention has the following beneficial effects:

[0040] The technical solution provided by the present invention,

[0041] A power compensation device with one end grounded is connected to a bidirectional open simulation interface of a pre-built electromechanical transient-electromagnetic transient hybrid simulation model of an AC / DC power grid; a controlled switch in the power compensation device is closed, and electromagnetic transient simulation and electromechanical transient simulation are performed on the electromagnetic model and the electromechanical model in the hybrid simulation model respectively; when the output power of the clamping voltage source in the power compensation device is not less than a preset threshold value within a preset duration, the simulation fails, and an unreasonable alarm message of the power flow simulation data setting assigned by the hybrid simulation model is output; otherwise, the controlled switch of the power compensation device is turned off, the simulation is continued until the end, and the simulation result is output. The technical solution provided by the present invention connects a controllable power compensation device at a simulation interface with a two-way opening, and realizes decoupling of the electromechanical model and the electromagnetic model in the simulation startup phase through the power compensation effect of the clamping voltage source of the power compensation device, so that the electromechanical model is not affected by the unstable state of the electromagnetic model, and the electromagnetic model can quickly enter a steady state with the support of the clamping voltage source; when the clamping voltage source reaches a small power output, it is automatically cut off, and the simulation interface with a two-way opening independently undertakes the data interaction between the electromechanical model and the electromagnetic model, which solves the problem that the unstable state of the electromagnetic model in the simulation startup phase affects the electromechanical model, resulting in large fluctuations in the interactive data of the simulation interface with a two-way opening and difficulty in stable startup, thereby enabling the smooth progress of the electromechanical transient-electromagnetic transient hybrid simulation.

[0042] The technical solution provided by the present invention has wide adaptability, simple means and high speed. BRIEF DESCRIPTION OF THE DRAWINGS

[0043] Figure 1 It is a flow chart of the electromechanical transient-electromagnetic transient hybrid simulation method;

[0044] Figure 2 is a schematic diagram of the access method of the power compensation device in an embodiment of the present invention;

[0045] Figure 3 It is a schematic diagram of a hybrid electromechanical transient-electromagnetic transient simulation model of a certain AC / DC hybrid power grid in an embodiment of the present invention;

[0046] Figure 4 It is a comparison diagram of electromechanical transient-electromagnetic transient hybrid simulation effects of a certain AC / DC hybrid power grid in an embodiment of the present invention;

[0047] Figure 5 It is a result diagram of the electromechanical transient-electromagnetic transient hybrid simulation system. DETAILED DESCRIPTION

[0048] The specific implementation modes of the present invention will be further described in detail below in conjunction with the accompanying drawings.

[0049] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0050] The present invention provides a hybrid electromechanical transient-electromagnetic transient simulation method, such as Figure 1 As shown, the method includes:

[0051] Step 101 is used to connect a power compensation device with one end grounded to a bidirectionally open simulation interface of a pre-built AC / DC power grid electromechanical transient-electromagnetic transient hybrid simulation model;

[0052] Step 102 is used to close the controlled switch in the power compensation device, and perform electromagnetic transient simulation and electromechanical transient simulation on the electromagnetic model and the electromechanical model in the hybrid simulation model respectively; Step 103 is used to fail the simulation when the output power of the clamping voltage source in the power compensation device is not less than a preset threshold value within a preset duration, and output an unreasonable alarm message of the power flow simulation data set assigned by the hybrid simulation model; otherwise, turn off the controlled switch of the power compensation device, continue the simulation to the end, and output the simulation result.

[0053] Specifically, the process of pre-building the AC / DC power grid electromechanical transient-electromagnetic transient hybrid simulation model includes:

[0054] Step A is used to perform power flow simulation on a pre-built AC / DC power grid electromechanical model based on preset operation information and preset power flow constraints to obtain power flow simulation data;

[0055] In the best embodiment of the present invention, the flow simulation of the pre-built AC / DC power grid electromechanical model based on the preset information and the preset flow constraints, after obtaining the flow simulation data, may also include:

[0056] S1: Set the calculation step size, total calculation time and iteration allowable error, and perform electromechanical transient stability calculation on the electromechanical model of the AC / DC power grid based on the power flow simulation data;

[0057] S2: If the calculation result is unstable, reset the preset operation information, perform power flow simulation on the electromechanical model of the AC / DC power grid again, obtain power flow simulation data, and return to S1; otherwise, update the power flow simulation data to the power flow simulation data obtained by the last power flow simulation.

[0058] Step B is used to build an electromagnetic model corresponding to a preselected area in the AC / DC power grid;

[0059] Step C, for intercepting the electromechanical model corresponding to the non-preselected area in the AC / DC power grid in the electromechanical model of the AC / DC power grid;

[0060] Step D, for connecting the electromagnetic model corresponding to the preselected area with the busbar with the same name in the electromechanical model corresponding to the non-preselected area by using the bidirectionally opened simulation interface;

[0061] Step E is used to assign the power flow simulation data to the corresponding electromagnetic model of the preselected area and the corresponding electromechanical model of the non-preselected area to generate an AC / DC power grid electromechanical transient-electromagnetic transient hybrid simulation model.

[0062] Further, the preset operation information includes at least one of the following: active power and reactive power of some generators of the AC / DC power grid, effective value and phase angle of line voltage of some buses, active power on the DC rectifier side, total capacity of compensation capacitor filter on the DC rectifier side, total capacity of compensation capacitor filter on the DC inverter side, DC voltage on the DC rectifier side, trigger angle on the DC rectifier side, shut-off angle on the DC inverter side, and DC single-pole and bipolar operation mode;

[0063] The preset power flow constraint includes at least one of the following: the line transmission power does not exceed the thermal stability limit of the line itself, and the transformer input power does not exceed the rated capacity of the transformer.

[0064] In the best embodiment of the present invention, the preset power flow constraint may also include the convergence of power flow results and ensuring that the deviation value of the node voltage complies with the relevant provisions of the "Technical Guidelines for Voltage and Reactive Power of Power Systems".

[0065] Furthermore, the power flow simulation data includes at least one of the following: the initial effective value and initial phase angle of the line voltage of each bus of the simulated AC / DC power grid, the initial active power and initial reactive power of each generator, the initial active power on the DC rectifier side, the initial active power on the DC inverter side, the total capacity of the compensation capacitor filter on the DC rectifier side, the total capacity of the compensation capacitor filter on the DC inverter side, the initial DC voltage and initial DC current on the DC rectifier side, the initial DC voltage and initial DC current on the DC inverter side, the initial trigger angle on the DC rectifier side, the initial shutdown angle on the DC inverter side, the DC single-pole and bipolar operation modes, the tap position of the converter transformer on the DC rectifier side, and the tap position of the converter transformer on the DC inverter side.

[0066] Specifically, the connection point between the power compensation device and the simulation interface is located close to the electromagnetic model of the pre-built AC / DC power grid electromechanical transient-electromagnetic transient hybrid simulation model;

[0067] The power compensation device comprises a clamping voltage source and a controlled switch connected in series;

[0068] Among them, the voltage effective value and phase angle of the clamping voltage source are respectively set to the voltage effective value and phase angle of the bus connected to the bidirectional open simulation interface connected to the power compensation device to which it belongs; the clamping voltage source is used to compensate for the power deviation of the bus with the same name in the corresponding electromagnetic model of the preselected area and the electromechanical model corresponding to the non-preselected area at the bidirectional open simulation interface.

[0069] In the preferred embodiment of the present invention, Figure 2 As shown in the figure, the reconstructed electromechanical transient-electromagnetic transient hybrid model is as follows Figure 2 As shown, the internal resistance of the clamping voltage source is set to 0.000001 ohm, the internal inductance is set to 0 Henry, and the internal resistance of the controlled switch is set to 0.000001 ohm.

[0070] In the best embodiment of the present invention, the preset threshold value can be one thousandth of the short-circuit capacity of the electromechanical model, and the output power of the clamping voltage source includes the active power output power and reactive power output power of the clamping voltage source; the alarm time can be set to 5 seconds.

[0071] use Figure 3 The hybrid simulation model shown is used as an example to illustrate the technical solution of the present invention:

[0072] Step 1: Build an electromechanical model of the AC / DC hybrid power grid, and perform power flow simulation on the model to obtain power flow simulation results;

[0073] Step 2: Set the calculation step size to 0.01 seconds, the total calculation time to 20 seconds, the iteration allowable error to 0.00050, and perform electromechanical transient stability calculation on the electromechanical model of the AC / DC hybrid power grid based on the power flow simulation results. If it is unstable, repeat step 1, otherwise proceed to step 3;

[0074] Step 3: Select the AC busbar on the DC rectifier side and the AC busbar on the inverter side as the contact points for the electromechanical transient-electromagnetic transient hybrid simulation, and determine the pre-selected area and non-pre-selected area of ​​this AC / DC hybrid power grid;

[0075] Step 4: Build an electromagnetic model corresponding to the preselected area of ​​this AC / DC hybrid power grid, set the simulation step of the electromagnetic model to 50 microseconds, and use the trapezoidal implicit integration method as the integration method;

[0076] Step 5: intercepting the electromechanical model corresponding to the non-preselected area of ​​the AC / DC hybrid power grid;

[0077] Step 6: Use the bidirectionally open simulation interface to connect the electromagnetic model corresponding to the preselected area with the busbars with the same name in the electromechanical model corresponding to the non-preselected area, that is, a bidirectionally open simulation interface is connected between each pair of busbars with the same name;

[0078] Step 7: Assign the power flow simulation data to the corresponding electromagnetic model of the preselected area and the electromechanical model of the non-preselected area to generate an electromechanical transient-electromagnetic transient hybrid simulation model of the AC / DC power grid;

[0079] Step 8: Connect a power compensation device with one end grounded to the bidirectional open simulation interface of the hybrid simulation model, and make its contact point close to the direction of the electromagnetic model; wherein the power compensator is composed of a clamping voltage source and a controlled switch in series, the internal resistance of the clamping voltage source is set to 0.000001 ohm, the internal inductance is set to 0 Henry, and the internal resistance of the controlled switch is set to 0.000001 ohm;

[0080] Step 9: The voltage effective value and phase angle of the clamping voltage source are respectively set to the voltage effective value and phase angle of the bus connected to the bidirectional open simulation interface connected to the power compensation device to which it belongs;

[0081] Step 10: closing the controlled switch of the power compensation device, and starting to perform electromagnetic transient simulation on the electromagnetic model corresponding to the preselected area, and performing electromechanical transient simulation on the electromechanical model corresponding to the non-preselected area;

[0082] Step 11: monitoring the output power of the clamping voltage source of the power compensation device;

[0083] Step 12: If the output power of the clamping voltage source of the monitored power compensation device is not less than the preset threshold value within the preset duration, the unreasonable alarm information of the power flow simulation data assigned by the hybrid simulation model is output, and the simulation state is exited; otherwise, the controlled switch of the power compensation device is turned off, the simulation is continued to the end, and the simulation result is output.

[0084] like Figure 4 As shown, when the technical solution provided by the present invention is adopted, the active power on the DC rectifier side enters a steady state after 1 second, and then the clamping voltage source is cut off, and the power fluctuates only slightly; if the method provided by the present invention is not adopted, the active power on the DC rectifier side fluctuates greatly all the time, cannot enter a steady state, and the interface cannot start normally.

[0085] The present invention provides a hybrid electromechanical transient-electromagnetic transient simulation system, such as Figure 5 As shown, the system comprises:

[0086] A connection module is used to connect a power compensation device with one end grounded to a bidirectionally opened simulation interface of a pre-built AC / DC power grid electromechanical transient-electromechanical transient hybrid simulation model; a closing module is used to close the controlled switch in the power compensation device, and perform electromagnetic transient simulation and electromechanical transient simulation on the electromagnetic model and the electromechanical model in the hybrid simulation model respectively; an output module is used to fail the simulation when the output power of the clamping voltage source in the power compensation device is not less than a preset threshold value within a preset duration, and output an unreasonable alarm message of the power flow simulation data setting assigned by the hybrid simulation model; otherwise, turn off the controlled switch of the power compensation device, continue the simulation until the end, and output the simulation result.

[0087] Specifically, the system further includes a building module for pre-building an electromechanical transient-electromagnetic transient hybrid simulation model of an AC / DC power grid, and the building module specifically includes:

[0088] A power flow simulation unit, used to perform power flow simulation on a pre-built AC / DC power grid electromechanical model based on preset operation information and preset power flow constraints, and obtain power flow simulation data;

[0089] A construction unit, used for constructing an electromagnetic model corresponding to a preselected area in the AC / DC power grid;

[0090] An interception unit, used for intercepting the electromechanical model corresponding to the non-preselected area in the AC / DC power grid in the electromechanical model of the AC / DC power grid;

[0091] A connection unit, used to connect the electromagnetic model corresponding to the preselected area with the busbar with the same name in the electromechanical model corresponding to the non-preselected area by using a bidirectionally open simulation interface;

[0092] The generating unit is used to assign the power flow simulation data to the corresponding electromagnetic model of the preselected area and the corresponding electromechanical model of the non-preselected area, so as to generate an electromechanical transient-electromagnetic transient hybrid simulation model of the AC / DC power grid.

[0093] Further, the preset operation information includes at least one of the following: active power and reactive power of some generators of the AC / DC power grid, effective value and phase angle of line voltage of some buses, active power on the DC rectifier side, total capacity of compensation capacitor filter on the DC rectifier side, total capacity of compensation capacitor filter on the DC inverter side, DC voltage on the DC rectifier side, trigger angle on the DC rectifier side, shut-off angle on the DC inverter side, and DC single-pole and bipolar operation mode;

[0094] The preset power flow constraint includes at least one of the following: the line transmission power does not exceed the thermal stability limit of the line itself, and the transformer input power does not exceed the rated capacity of the transformer.

[0095] Furthermore, the power flow simulation data includes at least one of the following: the initial effective value and initial phase angle of the line voltage of each bus of the simulated AC / DC power grid, the initial active power and initial reactive power of each generator, the initial active power on the DC rectifier side, the initial active power on the DC inverter side, the total capacity of the compensation capacitor filter on the DC rectifier side, the total capacity of the compensation capacitor filter on the DC inverter side, the initial DC voltage and initial DC current on the DC rectifier side, the initial DC voltage and initial DC current on the DC inverter side, the initial trigger angle on the DC rectifier side, the initial shutdown angle on the DC inverter side, the DC single-pole and bipolar operation modes, the tap position of the converter transformer on the DC rectifier side, and the tap position of the converter transformer on the DC inverter side.

[0096] Specifically, the connection point between the power compensation device and the simulation interface is located close to the electromagnetic model of the pre-built AC / DC power grid electromechanical transient-electromagnetic transient hybrid simulation model;

[0097] The power compensation device comprises a clamping voltage source and a controlled switch connected in series;

[0098] Among them, the voltage effective value and phase angle of the clamping voltage source are respectively set to the voltage effective value and phase angle of the bus connected to the bidirectional open simulation interface connected to the power compensation device to which it belongs; the clamping voltage source is used to compensate for the power deviation of the bus with the same name in the corresponding electromagnetic model of the preselected area and the electromechanical model corresponding to the non-preselected area at the bidirectional open simulation interface.

[0099] Those skilled in the art will appreciate that the embodiments of the present application may be provided as methods, systems, or computer program products. Therefore, the present application may adopt the form of a complete hardware embodiment, a complete software embodiment, or an embodiment in combination with software and hardware. Moreover, the present application may adopt the form of a computer program product implemented in one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) that include computer-usable program code.

[0100] The present application is described with reference to the flowcharts and / or block diagrams of the methods, devices (systems), and computer program products according to the embodiments of the present application. It should be understood that each process and / or box in the flowchart and / or block diagram, as well as the combination of the processes and / or boxes in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing device to generate a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the processes in the flowchart and / or block diagram. Figure 1 A process or multiple processes and / or boxes Figure 1 A device that provides the functions specified in a block or multiple blocks.

[0101] These computer program instructions may also be stored in a computer-readable memory capable of directing a computer or other programmable data processing device to operate in a specific manner, so that the instructions stored in the computer-readable memory produce an article of manufacture comprising an instruction device, which implements the process Figure 1 A process or multiple processes and / or boxes Figure 1 A function specified in one or more boxes.

[0102] These computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operating steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing instructions for implementing the process. Figure 1 A process or multiple processes and / or boxes Figure 1 The steps for the functions specified in one or more boxes.

[0103] 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 it. Although the present invention has been described in detail with reference to the above embodiments, ordinary technicians in the relevant field should understand that the specific implementation methods of the present invention can still be modified or replaced by equivalents. Any modification or equivalent replacement that does not depart from the spirit and scope of the present invention should be covered within the scope of protection of the claims of the present invention.

Claims

1. A hybrid electromechanical transient-electromagnetic transient simulation method, characterized in that: The method comprises: Connect a power compensation device with one end grounded to a bidirectionally open simulation interface of a pre-built AC / DC power grid electromechanical transient-electromagnetic transient hybrid simulation model; Closing the controlled switch in the power compensation device, and performing electromagnetic transient simulation and electromechanical transient simulation on the electromagnetic model and the electromechanical model in the hybrid simulation model respectively; When the output power of the clamping voltage source in the power compensation device is not less than the preset threshold value within the preset duration, the simulation fails, and an unreasonable alarm message of the power flow simulation data setting assigned by the hybrid simulation model is output; otherwise, the controlled switch of the power compensation device is turned off, the simulation is continued until the end, and the simulation result is output; The connection point between the power compensation device and the simulation interface is located close to the electromagnetic model of the pre-built AC / DC power grid electromechanical transient-electromagnetic transient hybrid simulation model; The power compensation device includes a clamping voltage source and a controlled switch connected in series; Among them, the voltage effective value and phase angle of the clamping voltage source are respectively set to the voltage effective value and phase angle of the bus connected to the bidirectional open simulation interface connected to the power compensation device to which it belongs; the clamping voltage source is used to compensate for the power deviation of the bus with the same name in the corresponding electromagnetic model of the preselected area and the electromechanical model corresponding to the non-preselected area at the bidirectional open simulation interface.

2. The method according to claim 1, characterized in that The pre-built AC / DC power grid electromechanical transient-electromagnetic transient hybrid simulation model includes: Based on preset operation information and preset power flow constraints, a power flow simulation is performed on a pre-built electromechanical model of an AC or DC power grid to obtain power flow simulation data; Building an electromagnetic model corresponding to a preselected area in the AC / DC power grid; intercepting an electromechanical model corresponding to a non-preselected area in the AC / DC power grid in the electromechanical model of the AC / DC power grid; The electromagnetic model corresponding to the pre-selected area is connected to the busbar with the same name in the electromechanical model corresponding to the non-pre-selected area by using the bidirectionally open simulation interface; The power flow simulation data is assigned to the corresponding electromagnetic model of the preselected area and the electromechanical model of the non-preselected area to generate an electromechanical transient-electromagnetic transient hybrid simulation model of the AC / DC power grid.

3. The method according to claim 2, characterized in that The preset operation information includes at least one of the following: active power and reactive power of some generators of the AC / DC power grid, effective value and phase angle of line voltage of some buses, active power on the DC rectifier side, total capacity of compensation capacitor filter on the DC rectifier side, total capacity of compensation capacitor filter on the DC inverter side, DC voltage on the DC rectifier side, trigger angle on the DC rectifier side, shut-off angle on the DC inverter side, and DC single-pole and bipolar operation mode; The preset power flow constraint includes at least one of the following: the line transmission power does not exceed the thermal stability limit of the line itself, and the transformer input power does not exceed the rated capacity of the transformer.

4. The method according to claim 2, characterized in that The power flow simulation data includes at least one of the following: the initial effective value and initial phase angle of the line voltage of each bus of the simulated AC / DC power grid, the initial active power and initial reactive power of each generator, the initial active power on the DC rectifier side, the initial active power on the DC inverter side, the total capacity of the compensation capacitor filter on the DC rectifier side, the total capacity of the compensation capacitor filter on the DC inverter side, the initial DC voltage and initial DC current on the DC rectifier side, the initial DC voltage and initial DC current on the DC inverter side, the initial trigger angle on the DC rectifier side, the initial shutdown angle on the DC inverter side, the DC single-pole and bipolar operation modes, the tap position of the converter transformer on the DC rectifier side, and the tap position of the converter transformer on the DC inverter side.

5. A hybrid electromechanical transient-electromagnetic transient simulation system, characterized in that: The system comprises: A connection module is used to connect a power compensation device with one end grounded to a bidirectionally opened simulation interface of a pre-built AC / DC power grid electromechanical transient-electromagnetic transient hybrid simulation model; A closing module, used for closing the controlled switch in the power compensation device, and performing electromagnetic transient simulation and electromechanical transient simulation on the electromagnetic model and the electromechanical model in the hybrid simulation model respectively; An output module, for when the output power of the clamping voltage source in the power compensation device is not less than a preset threshold value within a preset duration, the simulation fails and an alarm message indicating that the power flow simulation data assigned by the hybrid simulation model is set unreasonable is output; otherwise, the controlled switch of the power compensation device is turned off, the simulation is continued until the end, and the simulation result is output; The connection point between the power compensation device and the simulation interface is located close to the electromagnetic model of the pre-built AC / DC power grid electromechanical transient-electromagnetic transient hybrid simulation model; The power compensation device comprises a clamping voltage source and a controlled switch connected in series; Among them, the voltage effective value and phase angle of the clamping voltage source are respectively set to the voltage effective value and phase angle of the bus connected to the bidirectional open simulation interface connected to the power compensation device to which it belongs; the clamping voltage source is used to compensate for the power deviation of the bus with the same name in the corresponding electromagnetic model of the preselected area and the electromechanical model corresponding to the non-preselected area at the bidirectional open simulation interface.

6. The system according to claim 5, characterized in that The system also includes a building module for pre-building an AC / DC power grid electromechanical transient-electromagnetic transient hybrid simulation model, and the building module specifically includes: A power flow simulation unit, used to perform power flow simulation on a pre-built AC / DC power grid electromechanical model based on preset operation information and preset power flow constraints, and obtain power flow simulation data; A construction unit, used for constructing an electromagnetic model corresponding to a preselected area in the AC / DC power grid; An interception unit, used for intercepting the electromechanical model corresponding to the non-preselected area in the AC / DC power grid in the electromechanical model of the AC / DC power grid; A connection unit, used to connect the electromagnetic model corresponding to the preselected area with the busbar with the same name in the electromechanical model corresponding to the non-preselected area by using a bidirectionally open simulation interface; The generating unit is used to assign the power flow simulation data to the corresponding electromagnetic model of the preselected area and the corresponding electromechanical model of the non-preselected area, so as to generate an electromechanical transient-electromagnetic transient hybrid simulation model of the AC / DC power grid.

7. The system according to claim 6, characterized in that The preset operation information includes at least one of the following: active power and reactive power of some generators of the AC / DC power grid, effective value and phase angle of line voltage of some buses, active power on the DC rectifier side, total capacity of compensation capacitor filter on the DC rectifier side, total capacity of compensation capacitor filter on the DC inverter side, DC voltage on the DC rectifier side, trigger angle on the DC rectifier side, shut-off angle on the DC inverter side, and DC single-pole and bipolar operation mode; The preset power flow constraint includes at least one of the following: the line transmission power does not exceed the thermal stability limit of the line itself, and the transformer input power does not exceed the rated capacity of the transformer.

8. The system according to claim 6, characterized in that The power flow simulation data includes at least one of the following: the initial effective value and initial phase angle of the line voltage of each bus of the simulated AC / DC power grid, the initial active power and initial reactive power of each generator, the initial active power on the DC rectifier side, the initial active power on the DC inverter side, the total capacity of the compensation capacitor filter on the DC rectifier side, the total capacity of the compensation capacitor filter on the DC inverter side, the initial DC voltage and initial DC current on the DC rectifier side, the initial DC voltage and initial DC current on the DC inverter side, the initial trigger angle on the DC rectifier side, the initial shutdown angle on the DC inverter side, the DC single-pole and bipolar operation modes, the tap position of the converter transformer on the DC rectifier side, and the tap position of the converter transformer on the DC inverter side.

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