CN112787345B - Simulation system and simulation method of direct current circuit breaker - Google Patents

Abstract

The invention relates to a simulation system and simulation method of a DC circuit breaker, comprising: a main branch simulation circuit, a transfer branch simulation circuit and an energy consumption branch simulation circuit connected in parallel in sequence; the main branch simulation circuit includes: The first controlled voltage source and the first adjustable resistance; the transfer branch simulation circuit includes: the second controlled voltage source and the second adjustable resistance connected in series; the technical scheme provided by the present invention simplifies the simulation system The size of the matrix to be solved improves the simulation efficiency and saves a lot of computing resources.

Description

A simulation system and simulation method for a DC circuit breaker

technical field

The invention relates to the technical field of flexible DC power transmission in power systems, in particular to a simulation system and simulation method for a DC circuit breaker.

Background technique

Flexible DC transmission is an important technical means for the development of smart grids. Compared with conventional DC transmission methods, flexible DC transmission has strong technical advantages in island power supply, interconnection of large-scale AC systems, and new energy grid integration. development prospects. As one of the key equipment to ensure the safe and reliable operation of the flexible DC system, the DC circuit breaker plays an important role in the establishment of the DC grid, improving the flexibility of the grid operation and the reliability of the power supply.

At present, in the method of breaking DC current, the segmentation time of mechanical circuit breaker is too long, which cannot meet the requirements of multi-terminal flexible DC transmission system; the solid-state switch based on power electronic components has the economic problem of excessive on-state loss . The hybrid circuit breaker, which combines mechanical switches and power electronic switches through a certain topology, combines the advantages of low loss of mechanical switches and short action time of solid-state switches, and has become the mainstream of development.

For the modeling and learning of hybrid circuit breakers in flexible DC systems, there are mainly two methods at this stage. In the first method, it is equivalent to a switch with a delay function, that is, when the circuit breaker receives a shutdown signal, a certain delay is used to simulate the action time of the mechanical switch in the hybrid circuit breaker, so that the system can be approximated Based on the response characteristics of the actual circuit breaker. However, this modeling method cannot reflect the electromagnetic situation inside the circuit breaker during the breaking process, and under different current conditions, the closing time of the hybrid circuit breaker is different, and it is not appropriate to replace the operating time of the circuit breaker with a fixed delay. precise. The second method is to use the power electronic switch module in the simulation software to build a detailed hybrid circuit breaker. This method can accurately reflect the electromagnetic conditions inside the circuit breaker during the breaking process. However, since the hybrid circuit breaker requires a large number of power electronic switches, this method greatly increases the size of the matrix to be solved in the simulation system, which not only reduces the simulation efficiency, but also wastes computing resources.

Contents of the invention

Aiming at the deficiencies of the prior art, the object of the present invention is to provide a simulation system of a DC circuit breaker, which simplifies the scale of the matrix to be solved in the simulation process, improves the simulation efficiency, and saves a lot of computing resources.

The object of the present invention is to adopt following technical scheme to realize:

The present invention provides a simulation system of a DC circuit breaker. The improvement is that the simulation system includes: a main branch simulation circuit, a transfer branch simulation circuit and an energy consumption branch simulation circuit connected in parallel in sequence;

The main branch analog circuit includes: a first controlled voltage source and a first adjustable resistor connected in series;

The transfer branch simulation circuit includes: a second controlled voltage source and a second adjustable resistor connected in series.

Preferably, the energy-consuming branch simulation circuit includes a lightning arrester.

The present invention provides a simulation method for a simulation system of a DC circuit breaker, characterized in that the method includes:

Judging whether the DC circuit breaker opening signal is received;

According to whether the DC circuit breaker opening signal is received, the voltage values of the first controlled voltage source and the second controlled voltage source and the resistance values of the first adjustable resistor and the second adjustable resistor are adjusted to simulate the DC circuit breaker Operating status.

Preferably, adjusting the voltage values of the first controlled voltage source and the second controlled voltage source and the resistance values of the first adjustable resistor and the second adjustable resistor according to whether the DC circuit breaker opening signal is received includes :

When the opening signal of the DC circuit breaker is not received, the voltage value u ₁ (t) of the first controlled voltage source at the current moment t is adjusted according to the following formula:

Adjust the resistance value R ₁ of the first variable resistor according to the following formula:

R ₁ ＝n ₁ R _I-on +n ₁ R _e-on +R _j-on

Adjust the voltage value u ₂ (t) of the second controlled voltage source at the current moment t according to the following formula:

Adjust the resistance value R ₂ of the second variable resistor according to the following formula:

R ₂ =n ₂ R _I-off +n ₂ R _e-off

In the formula, L ₁ is the inductance value of the parasitic inductance in the main branch of the DC circuit breaker topology, L ₂ is the inductance value of the parasitic inductance in the transfer branch of the DC circuit breaker topology, Δt is the simulation step size, i ₁ ( t) is the current value flowing through the analog circuit of the main branch at the current time t, i ₁ (t-Δt) is the current value flowing through the analog circuit of the main branch at the time t+Δt, and i ₂ (t) is the current flowing through the analog circuit at the current time t The current value passing through the analog circuit of the transfer branch, i ₂ (t-Δt) is the current value flowing through the analog circuit of the transfer branch at time t+Δt, n ₁ is the number of sub-modules in the main branch of the DC circuit breaker topology n ₂ is the number of sub-modules in the transfer branch of the DC circuit breaker topology, V _on1 is the turn-on voltage of the IGBT device in the sub-module of the DC circuit breaker topology, V _on2 is the sub-module of the DC circuit breaker topology The turn-on voltage of the diode in the module, R _I-on is the on-resistance of the IGBT device in the sub-module of the DC circuit breaker topology, R _e-on is the on-resistance of the diode in the sub-module of the DC circuit breaker topology, R _j-on is the closing resistance of the mechanical switch in the main branch of the DC circuit breaker topology, R _I-off is the turn-off resistance of the IGBT device in the sub-module of the DC circuit breaker topology, R _e-off is the DC circuit breaker topology The off-resistance of the diode in the submodule of .

Preferably, adjusting the voltage values of the first controlled voltage source and the second controlled voltage source and the resistance values of the first adjustable resistor and the second adjustable resistor according to whether the DC circuit breaker opening signal is received includes :

When the opening signal of the DC circuit breaker is received, the voltage values of the first controlled voltage source and the second controlled voltage source and the first adjustable resistance and the second adjustable voltage source are adjusted according to the current value flowing through the main branch analog circuit. Adjust the resistance value of the resistor.

Further, the adjusting the voltage values of the first controlled voltage source and the second controlled voltage source and the resistance values of the first adjustable resistor and the second adjustable resistor according to the current value flowing through the main branch analog circuit includes :

When the current value flowing through the main branch analog circuit is not 0, the voltage value u ₁ (t) of the first controlled voltage source at the current moment t is adjusted according to the following formula:

Adjust the resistance value R ₁ of the first variable resistor according to the following formula:

R ₁ ＝n ₁ R _I-on +n ₁ R _e-on +R _j-on

Adjust the voltage value u ₂ (t) of the second controlled voltage source at the current moment t according to the following formula:

Adjust the resistance value R ₂ of the second variable resistor according to the following formula:

R ₂ ＝n ₂ R _I-on +n ₂ R _e-on

When the current value flowing through the main branch analog circuit is 0, the voltage value u ₁ (t) of the first controlled voltage source at the current moment t is adjusted according to the following formula:

Adjust the resistance value R ₁ of the first variable resistor according to the following formula:

R ₁ =R _j-off

Adjust the voltage value u ₂ (t) of the second controlled voltage source at the current moment t according to the following formula:

Adjust the resistance value R ₂ of the second variable resistor according to the following formula:

R ₂ ＝n ₂ R _I-on +n ₂ R _e-on

In the formula, L ₁ is the inductance value of the parasitic inductance in the main branch of the DC circuit breaker topology, L ₂ is the inductance value of the parasitic inductance in the transfer branch of the DC circuit breaker topology, Δt is the simulation step size, i ₁ ( t) is the current value flowing through the analog circuit of the main branch at the current time t, i ₁ (t-Δt) is the current value flowing through the analog circuit of the main branch at the time t+Δt, and i ₂ (t) is the current flowing through the analog circuit at the current time t The current value passing through the analog circuit of the transfer branch, i ₂ (t-Δt) is the current value flowing through the analog circuit of the transfer branch at time t+Δt, n ₁ is the number of sub-modules in the main branch of the DC circuit breaker topology n ₂ is the number of sub-modules in the transfer branch of the DC circuit breaker topology, V _on1 is the turn-on voltage of the IGBT device in the sub-module of the DC circuit breaker topology, V _on2 is the sub-module of the DC circuit breaker topology The turn-on voltage of the diode in the module, R _I-on is the on-resistance of the IGBT device in the sub-module of the DC circuit breaker topology, R _e-on is the on-resistance of the diode in the sub-module of the DC circuit breaker topology, R _j-on is the closing resistance of the mechanical switch in the main branch of the DC circuit breaker topology, R _I-off is the turn-off resistance of the IGBT device in the sub-module of the DC circuit breaker topology, R _e-off is the DC circuit breaker topology The turn-off resistance of the diode in the sub-module of , C ₁ is the capacitance value of the main branch in the topology of the DC circuit breaker, i ₁ (t-2Δt) is the current value flowing through the analog circuit of the main branch at time t-2Δt, u ₁ (t-Δt) is the voltage value of the first controlled voltage source at the time t-Δt, C ₂ is the capacitance value of the transfer branch in the topology of the DC circuit breaker, and i ₂ (t-2Δt) is the current flow at the time t-2Δt The current value of the transfer branch, u ₂ (t-Δt) is the voltage value of the second controlled voltage source at the time t-Δt; R _j-on is the opening resistance of the mechanical switch in the main branch of the DC circuit breaker topology .

Preferably, when the voltage value of the second controlled voltage source is greater than the preset voltage value, the arrester on the analog circuit of the energy consumption branch is activated.

Compared with the closest prior art, the present invention has the beneficial effects:

According to the technical solution provided by the present invention, the simulation system includes: a main branch simulation circuit, a transfer branch simulation circuit and an energy consumption branch simulation circuit connected in parallel in sequence; the main branch simulation circuit includes: a first controlled circuit connected in series A voltage source and a first adjustable resistance; the transfer branch analog circuit includes: a second controlled voltage source connected in series and a second adjustable resistance, which reduces the scale of the matrix to be solved in the simulation process, improves simulation efficiency, and saves A lot of computing resources.

Description of drawings

Figure 1 is a structural diagram of a simulation system of a DC circuit breaker;

Figure 2 is a topology diagram of a DC circuit breaker.

detailed description

The specific implementation manners of the present invention will be further described in detail below in conjunction with the accompanying drawings.

In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions 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 It is a part of embodiments of the present invention, but not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

Usually, the topological structure of a DC circuit breaker in practical applications, as shown in Figure 1, in the topological structure of a DC circuit breaker, includes: parallel main branch, transfer branch and energy consumption branch, where the main branch includes : the first parasitic inductance, mechanical switch and sub-module connected in sequence (there may be multiple sub-modules in the main branch, and their values are determined according to specific working conditions); the transfer branch includes: the second parasitic inductance and sub-module units connected in sequence; A lightning arrester is arranged on the energy consumption branch, and the sub-module unit is composed of a plurality of sub-modules in series; the sub-module of the sub-module is composed of four power electronic devices and a capacitor.

When the above-mentioned DC circuit breaker is working, according to the working principle of the sub-module, the sub-module can be equivalent to a series connection of a controlled voltage source and a resistor. At the same time, the inductor in the branch circuit can also be regarded as a series connection of a controlled voltage source and a resistor. Form, based on this, the present invention provides a simulation system of a DC circuit breaker, as shown in Figure 2, the simulation system includes: a main branch simulation circuit, a transfer branch simulation circuit and an energy consumption branch simulation circuit connected in parallel in sequence ;

The main branch analog circuit includes: a first controlled voltage source and a first adjustable resistor connected in series;

The transfer branch simulation circuit includes: a second controlled voltage source and a second adjustable resistor connected in series.

Wherein, the analog circuit of the energy consumption branch includes a lightning arrester. In the preferred embodiment of the present invention, by setting the voltage source in series with the resistor, the circuit breaker can be guaranteed to have bidirectional conduction characteristics. By setting R2 to simulate the shutdown of the sub-module in the transfer branch, the problem of circulating current caused by the different values of the controlled voltage source in the main branch and the transfer branch can be solved, and the circuit breaker model can truly reflect the actual circuit breaker. operating characteristics.

Based on the above-mentioned simulation system of a DC circuit breaker, the present invention provides a simulation method of a DC circuit breaker, including:

Judging whether the DC circuit breaker opening signal is received;

According to whether the DC circuit breaker opening signal is received, the voltage values of the first controlled voltage source and the second controlled voltage source and the resistance values of the first adjustable resistor and the second adjustable resistor are adjusted to simulate the DC circuit breaker Operating status.

In a specific embodiment of the present invention, when the control and protection module of the DC system judges that the current flowing into the simulation system of the DC circuit breaker is a fault current, the control and protection module of the DC system sends a DC circuit breaker opening signal; otherwise, the DC system's The control protection module does not send the DC circuit breaker opening signal;

Preferably, adjusting the voltage values of the first controlled voltage source and the second controlled voltage source and the resistance values of the first adjustable resistor and the second adjustable resistor according to whether the DC circuit breaker opening signal is received includes :

When the opening signal of the DC circuit breaker is not received, the voltage value u ₁ (t) of the first controlled voltage source at the current moment t is adjusted according to the following formula:

Adjust the resistance value R ₁ of the first variable resistor according to the following formula:

R ₁ ＝n ₁ R _I-on +n ₁ R _e-on +R _j-on

Adjust the voltage value u ₂ (t) of the second controlled voltage source at the current moment t according to the following formula:

Adjust the resistance value R ₂ of the second variable resistor according to the following formula:

R ₂ =n ₂ R _I-off +n ₂ R _e-off

In the formula, L ₁ is the inductance value of the parasitic inductance in the main branch of the DC circuit breaker topology, L ₂ is the inductance value of the parasitic inductance in the transfer branch of the DC circuit breaker topology, Δt is the simulation step size, i ₁ ( t) is the current value flowing through the analog circuit of the main branch at the current time t, i ₁ (t-Δt) is the current value flowing through the analog circuit of the main branch at the time t+Δt, and i ₂ (t) is the current flowing through the analog circuit at the current time t The current value passing through the analog circuit of the transfer branch, i ₂ (t-Δt) is the current value flowing through the analog circuit of the transfer branch at time t+Δt, n ₁ is the number of sub-modules in the main branch of the DC circuit breaker topology n ₂ is the number of sub-modules in the transfer branch of the DC circuit breaker topology, V _on1 is the turn-on voltage of the IGBT device in the sub-module of the DC circuit breaker topology, V _on2 is the sub-module of the DC circuit breaker topology The turn-on voltage of the diode in the module, R _I-on is the on-resistance of the IGBT device in the sub-module of the DC circuit breaker topology, R _e-on is the on-resistance of the diode in the sub-module of the DC circuit breaker topology, R _j-on is the closing resistance of the mechanical switch in the main branch of the DC circuit breaker topology, R _I-off is the turn-off resistance of the IGBT device in the sub-module of the DC circuit breaker topology, R _e-off is the DC circuit breaker topology The off-resistance of the diode in the submodule of .

When the opening signal of the DC circuit breaker is not received, the mechanical switch of the real DC circuit breaker is closed, the sub-modules in the main branch are closed, and hundreds of sub-modules in the transfer branch are turned off. At this time, the DC circuit breaker The value of the resistance in the main branch is equal to the sum of the on-resistance of the IGBT in the sub-module, the on-resistance of the diode and the closing resistance of the mechanical switch, and the resistance in the transfer branch is the off-resistance of the IGBT in the sub-module and the closing resistance of the diode. The sum of the off resistance, the voltage of the main branch and the transfer branch is the sum of the conduction voltage of the IGBT in the sub-module on the branch, the conduction voltage of the diode and the inductor voltage;

In order to be consistent with the electrical stress of the real DC circuit breaker, the first adjustable resistance of the simulation system of the DC circuit breaker is adjusted to the sum of the on-resistance of the IGBT in the sub-module of the main branch, the on-resistance of the diode and the closing resistance of the mechanical switch , the second adjustable resistance is adjusted to the sum of the turn-off resistance of the IGBT in the sub-module of the transfer branch and the turn-off resistance of the diode; The sum of the conduction voltage and the inductor voltage, the voltage of the second received conduction voltage source is adjusted to be the sum of the conduction voltage of the IGBT in the sub-module on the transfer branch, the conduction voltage of the diode and the inductor voltage.

Preferably, adjusting the voltage values of the first controlled voltage source and the second controlled voltage source and the resistance values of the first adjustable resistor and the second adjustable resistor according to whether the DC circuit breaker opening signal is received includes :

When the opening signal of the DC circuit breaker is received, the voltage values of the first controlled voltage source and the second controlled voltage source and the first adjustable resistance and the second adjustable voltage source are adjusted according to the current value flowing through the main branch analog circuit. Adjust the resistance value of the resistor.

Further, the adjusting the voltage values of the first controlled voltage source and the second controlled voltage source and the resistance values of the first adjustable resistor and the second adjustable resistor according to the current value flowing through the main branch analog circuit includes :

When the current value flowing through the main branch analog circuit is not 0, the voltage value u ₁ (t) of the first controlled voltage source at the current moment t is adjusted according to the following formula:

Adjust the resistance value R ₁ of the first variable resistor according to the following formula:

R ₁ ＝n ₁ R _I-on +n ₁ R _e-on +R _j-on

Adjust the voltage value u ₂ (t) of the second controlled voltage source at the current moment t according to the following formula:

Adjust the resistance value R ₂ of the second variable resistor according to the following formula:

R ₂ ＝n ₂ R _I-on +n ₂ R _e-on

In the preferred embodiment of the present invention, when the opening signal of the DC circuit breaker is not received and the current value flowing through the analog circuit of the main branch is not 0, the sub-modules in the main branch are turned off, and transfer Hundreds of sub-modules of the branch circuit are closed, and the current flowing through the circuit breaker starts to shift from the main branch circuit to the transfer branch circuit. The sum of the on-resistance, the on-resistance of the diode and the closing resistance of the mechanical switch, the resistance in the transfer branch is the sum of the on-resistance of the IGBT in the sub-module of the branch and the on-resistance of the diode, the voltage of the main branch is The sum of the capacitor voltage, the inductor voltage and the voltage in the previous capacitor in this branch, the voltage of the transfer branch is the sum of the conduction voltage of the IGBT in the sub-module in the branch, the conduction voltage of the diode and the sum of the inductor voltage;

In order to be consistent with the electrical stress of a real DC circuit breaker, the first adjustable resistance of the present invention is adjusted to the sum of the on-resistance of the IGBT, the on-resistance of the diode and the closing resistance of the mechanical switch in the sub-module of the main branch circuit. The second adjustable resistance is adjusted to be the sum of the on-resistance of the IGBT in the sub-module in the sub-module of the transfer branch and the sum of the on-resistance of the diode; The sum of the capacitor voltages, the voltage of the second received voltage source is adjusted to be the sum of the conduction voltage of the IGBT in the sub-module on the transfer branch, the conduction voltage of the diode and the inductor voltage.

When the current value flowing through the main branch analog circuit is 0, the voltage value u ₁ (t) of the first controlled voltage source at the current moment t is adjusted according to the following formula:

Adjust the resistance value R ₁ of the first variable resistor according to the following formula:

R ₁ =R _j-off

Adjust the voltage value u ₂ (t) of the second controlled voltage source at the current moment t according to the following formula:

Adjust the resistance value R ₂ of the second variable resistor according to the following formula:

R ₂ ＝n ₂ R _I-on +n ₂ R _e-on

In the formula, L ₁ is the inductance value of the parasitic inductance in the main branch of the DC circuit breaker topology, L ₂ is the inductance value of the parasitic inductance in the transfer branch of the DC circuit breaker topology, Δt is the simulation step size, i ₁ ( t) is the current value flowing through the analog circuit of the main branch at the current time t, i ₁ (t-Δt) is the current value flowing through the analog circuit of the main branch at the time t+Δt, and i ₂ (t) is the current flowing through the analog circuit at the current time t The current value passing through the analog circuit of the transfer branch, i ₂ (t-Δt) is the current value flowing through the analog circuit of the transfer branch at time t+Δt, n ₁ is the number of sub-modules in the main branch of the DC circuit breaker topology n ₂ is the number of sub-modules in the transfer branch of the DC circuit breaker topology, V _on1 is the turn-on voltage of the IGBT device in the sub-module of the DC circuit breaker topology, V _on2 is the sub-module of the DC circuit breaker topology The turn-on voltage of the diode in the module, R _I-on is the on-resistance of the IGBT device in the sub-module of the DC circuit breaker topology, R _e-on is the on-resistance of the diode in the sub-module of the DC circuit breaker topology, R _j-on is the closing resistance of the mechanical switch in the main branch of the DC circuit breaker topology, R _I-off is the turn-off resistance of the IGBT device in the sub-module of the DC circuit breaker topology, R _e-off is the DC circuit breaker topology The turn-off resistance of the diode in the sub-module of , C ₁ is the capacitance value of the main branch in the topology of the DC circuit breaker, i ₁ (t-2Δt) is the current value flowing through the analog circuit of the main branch at time t-2Δt, u ₁ (t-Δt) is the voltage value of the first controlled voltage source at the time t-Δt, C ₂ is the capacitance value of the transfer branch in the topology of the DC circuit breaker, and i ₂ (t-2Δt) is the current flow at the time t-2Δt The current value of the transfer branch, u ₂ (t-Δt) is the voltage value of the second controlled voltage source at the time t-Δt; R _j-on is the opening resistance of the mechanical switch in the main branch of the DC circuit breaker topology .

In the preferred embodiment of the present invention, when the opening signal of the DC circuit breaker is not received and the current value flowing through the main branch analog circuit is not 0, the mechanical switch is opened, and when the machine is fully opened, the transfer The branch sub-module unit is turned off. At this time, the resistance in the main branch of the DC circuit breaker is equal to the resistance when the mechanical switch of the branch is turned on, and the resistance in the transfer branch is the conduction of the IGBT in the sub-module of the branch. The sum of the on-resistance and the on-resistance of the diode, the voltage of the main branch is the sum of the capacitor voltage, inductor voltage and the voltage in the previous capacitor in this branch, and the voltage of the transfer branch is the sum of the capacitor voltage, inductor voltage and The sum of the voltages in the previous capacitors;

In order to be consistent with the electrical stress of a real DC circuit breaker, the first adjustable resistance of the present invention is adjusted to the resistance when the mechanical switch in the sub-module of the main branch is turned on, and the second adjustable resistance is adjusted to the sub-module of the transfer branch. The sum of the on-resistance of the IGBT and the on-resistance of the diode in the module; the voltage of the first through-voltage source is adjusted to the sum of the capacitor voltage on the main branch, the inductor voltage and the capacitor voltage in the previous sub-module, and the second through-voltage source The voltage regulation of the transfer branch is the sum of the upper capacitor voltage, the inductor voltage and the capacitor voltage in the previous sub-module.

Preferably, when the voltage value of the second controlled voltage source is greater than the preset voltage value, the arrester on the analog circuit of the energy consumption branch is activated.

In the preferred embodiment of the present invention, when the voltage of the transfer branch of the DC circuit breaker exceeds a preset voltage, the arrester of the energy consumption branch is activated, and the current flows through the energy consumption branch. When the current flowing through the energy-consuming branch drops to 0, the fault is isolated; in order to be consistent with the electrical stress of the real DC circuit breaker, in the technical solution provided by the present invention, when the voltage value of the second controlled voltage source is greater than When the voltage value is preset, the lightning arrester on the analog circuit of the energy consumption branch is activated.

Those skilled in the art should understand that the embodiments of the present application may be provided as methods, systems, or computer program products. Accordingly, the present application may take the form of an entirely hardware embodiment, an entirely software embodiment, or an embodiment combining software and hardware aspects. Furthermore, the present application 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, etc.) having computer-usable program code embodied therein.

The present application is described with reference to flowcharts and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the present application. It should be understood that each procedure and/or block in the flowchart and/or block diagram, and a combination of procedures and/or blocks in the flowchart and/or block diagram can be realized by computer program instructions. These computer program instructions may be provided to a general purpose computer, special purpose computer, embedded processor, or processor of other programmable data processing equipment to produce a machine such that the instructions executed by the processor of the computer or other programmable data processing equipment produce a An apparatus for realizing the functions specified in one or more procedures of the flowchart and/or one or more blocks of the block diagram.

These computer program instructions may also be stored in a computer-readable memory capable of directing a computer or other programmable data processing apparatus to operate in a specific manner, such that the instructions stored in the computer-readable memory produce an article of manufacture comprising instruction means, the instructions The device realizes the function specified in one or more procedures of the flowchart and/or one or more blocks of the block diagram.

These computer program instructions can also be loaded onto a computer or other programmable data processing device, causing a series of operational steps to be performed on the computer or other programmable device to produce a computer-implemented process, thereby The instructions provide steps for implementing the functions specified in the flow chart or blocks of the flowchart and/or the block or blocks of the block diagrams.

Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and not to limit them. Although the present invention has been described in detail with reference to the above embodiments, those of ordinary skill in the art should understand that: the present invention can still be Any modifications or equivalent replacements that do not depart from the spirit and scope of the present invention shall fall within the protection scope of the claims of the present invention.

Claims (4)

1. A simulation method of a simulation system of a direct current breaker comprises the following steps:

the simulation system includes: the main branch circuit analog circuit, the transfer branch circuit analog circuit and the energy consumption branch circuit analog circuit are connected in parallel in sequence;

the main branch circuit analog circuit includes: a first controlled voltage source and a first adjustable resistor connected in series;

the transfer branch analog circuit includes: a second controlled voltage source and a second adjustable resistor connected in series;

the energy consumption branch circuit analog circuit comprises a lightning arrester;

characterized in that the method comprises:

judging whether a direct current breaker opening signal is received or not;

according to whether a direct current breaker opening signal is received or not, adjusting voltage values of a first controlled voltage source and a second controlled voltage source and resistance values of a first adjustable resistor and a second adjustable resistor to simulate the running state of the direct current breaker;

according to whether the direct current breaker opening signal is received, the voltage values of the first controlled voltage source and the second controlled voltage source and the resistance values of the first adjustable resistor and the second adjustable resistor are adjusted, and the method comprises the following steps:

when not usingWhen the opening signal of the direct current breaker is received, the voltage value u of the first controlled voltage source at the current moment t is adjusted according to the following formula ₁ (t)：

Adjusting the resistance R of the first adjustable resistor according to the following formula ₁ ：

R ₁ ＝n ₁ R _I-on +n ₁ R _e-on +R _j-on

Adjusting the voltage value u of the second controlled voltage source at the current moment t according to the following formula ₂ (t)：

Adjusting the resistance R of the second adjustable resistor according to the following formula ₂ ：

R ₂ ＝n ₂ R _I-off +n ₂ R _e-off

In the formula, L ₁ Is the inductance value, L, of parasitic inductances in the main branch of the DC breaker topology ₂ The inductance value of parasitic inductance in a transfer branch of the topological structure of the direct-current circuit breaker is shown, delta t is simulation step length, i ₁ (t) is the current value i flowing through the main branch circuit analog circuit at the current moment t ₁ (t- Δ t) is the value of the current flowing through the main branch analog circuit at the time t- Δ t, i ₂ (t) is the current value i flowing through the transfer branch circuit analog circuit at the current moment t ₂ (t- Δ t) is the value of the current flowing through the transfer branch analog circuit at the time t- Δ t, n ₁ The number of submodules in the main branch of the topology of the DC breaker, n ₂ Number of sub-modules in a transfer branch, V, of a DC breaker topology _on1 Is the conduction voltage, V, of an IGBT device in a submodule of a direct current breaker topological structure _on2 For the conduction voltage, R, of the diodes in the submodules of the DC breaker topology _I-on Is the on-resistance of the IGBT device in the sub-module of the direct current breaker topological structure,R _e-on is the on-resistance, R, of the diodes in the submodules of the DC breaker topology _j-on For closing the resistance, R, of a mechanical switch in the main branch of a DC breaker topology _I-off Is the turn-off resistance, R, of an IGBT device in a submodule of a direct current breaker topology _e-off The switching-off resistance of the diode in the submodule of the direct current breaker topological structure.

2. The method of claim 1, wherein adjusting the voltage values of the first controlled voltage source and the second controlled voltage source and the resistance values of the first adjustable resistor and the second adjustable resistor according to whether the dc breaker trip signal is received comprises:

when an opening signal of the direct current breaker is received, the voltage values of the first controlled voltage source and the second controlled voltage source and the resistance values of the first adjustable resistor and the second adjustable resistor are adjusted according to the current value flowing through the main branch circuit analog circuit.

3. The method of claim 2, wherein adjusting the voltage values of the first and second controlled voltage sources and the resistance values of the first and second adjustable resistors based on the value of the current flowing through the main branch analog circuit comprises:

when the current value flowing through the main branch circuit analog circuit is not 0, the voltage value u of the first controlled voltage source at the current moment t is adjusted according to the following formula ₁ (t)：

The resistance value R of the first adjustable resistor is adjusted according to the following formula ₁ ：

R ₁ ＝n ₁ R _I-on +n ₁ R _e-on +R _j-on

Adjusting the voltage value u of the second controlled voltage source at the current moment t according to the following formula ₂ (t)：

Adjusting the resistance R of the second adjustable resistor according to the following formula ₂ ：

R ₂ ＝n ₂ R _I-on +n ₂ R _e-on

When the current value flowing through the main branch circuit analog circuit is 0, the voltage value u of the first controlled voltage source at the current moment t is adjusted according to the following formula ₁ (t)：

The resistance value R of the first adjustable resistor is adjusted according to the following formula ₁ ：

R ₁ ＝R _j-off

Adjusting the voltage value u of the second controlled voltage source at the current moment t according to the following formula ₂ (t)：

Adjusting the resistance R of the second adjustable resistor according to the following formula ₂ ：

R ₂ ＝n ₂ R _I-on +n ₂ R _e-on

In the formula, L ₁ Is the inductance value, L, of the parasitic inductance in the main branch of the DC breaker topology ₂ The inductance value of parasitic inductance in a transfer branch of the topological structure of the direct-current circuit breaker is shown, delta t is simulation step length, i ₁ (t) is the current value i flowing through the main branch circuit analog circuit at the current moment t ₁ (t- Δ t) is the value of the current flowing through the main branch analog circuit at the time t- Δ t, i ₂ (t) is the current value i flowing through the transfer branch circuit analog circuit at the current moment t ₂ (t- Δ t) is the value of the current flowing through the transfer branch analog circuit at the time t- Δ t, n ₁ The number of submodules in the main branch of the topology of the DC breaker, n ₂ For dc circuit breakersNumber of sub-modules in transfer branch of topology, V _on1 Is the conduction voltage, V, of an IGBT device in a submodule of a direct current breaker topological structure _on2 For the conduction voltage, R, of the diodes in the submodules of the DC breaker topology _I-on Is the on-resistance, R, of the IGBT device in the sub-module of the DC breaker topology _e-on The on-resistance, R, of the diodes in the submodules of the topology of the DC breaker _j-on For closing the resistance, R, of a mechanical switch in the main branch of a DC breaker topology _I-off Is the turn-off resistance, R, of an IGBT device in a submodule of a direct current breaker topology _e-off For the turn-off resistance, C, of the diodes in the submodules of the DC breaker topology ₁ Is the capacitance value, i, of the main branch in the topology of the DC circuit breaker ₁ (t-2 Δ t) is the value of the current flowing through the main branch analog circuit at the time of t-2 Δ t, u ₁ (t- Δ t) is the voltage value of the first controlled voltage source at time t- Δ t, C ₂ For the capacitance value, i, of the transfer branch in the topology of the DC breaker ₂ (t-2. DELTA.t) is the value of the current flowing through the branch at the time t-2. DELTA.t, u ₂ (t- Δ t) is the voltage value of the second controlled voltage source at the time t- Δ t; r _j-Off Is the opening resistance of a mechanical switch in the main branch of the direct current breaker topology.

4. The method of claim 1, wherein the lightning arrester on the dissipative branch analog circuit is activated when the voltage level of the second controlled voltage source is greater than a predetermined voltage level.

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