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

Simulation system and simulation method of direct current circuit breaker Download PDF

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Publication number
CN112787345B
CN112787345B CN201911082446.2A CN201911082446A CN112787345B CN 112787345 B CN112787345 B CN 112787345B CN 201911082446 A CN201911082446 A CN 201911082446A CN 112787345 B CN112787345 B CN 112787345B
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breaker
value
resistance
circuit
current
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CN112787345A (en
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常彬
林畅
宗炫君
庞辉
闫鹤鸣
周家培
邹盛
周洪伟
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State Grid Corp of China SGCC
Global Energy Interconnection Research Institute
Economic and Technological Research Institute of State Grid Jiangsu Electric Power Co Ltd
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State Grid Corp of China SGCC
Global Energy Interconnection Research Institute
Economic and Technological Research Institute of State Grid Jiangsu Electric Power Co Ltd
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    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02JCIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J3/00Circuit arrangements for ac mains or ac distribution networks
    • H02J3/36Arrangements for transfer of electric power between ac networks via a high-tension dc link
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02EREDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/60Arrangements for transfer of electric power between AC networks or generators via a high voltage DC link [HVCD]

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  • Electronic Switches (AREA)
  • Driving Mechanisms And Operating Circuits Of Arc-Extinguishing High-Tension Switches (AREA)

Abstract

The invention relates to a simulation system and a simulation method of a direct current breaker, comprising the following steps: the main branch circuit analog circuit, the transfer branch circuit analog circuit and the energy consumption branch circuit analog circuit are sequentially connected in parallel; the main branch circuit analog circuit includes: a first controlled voltage source and a first adjustable resistor connected in series; the transfer branch circuit analog circuit includes: a second controlled voltage source and a second adjustable resistor connected in series; the technical scheme provided by the invention simplifies the scale of the matrix to be solved in the simulation system, improves the simulation efficiency and saves a large amount of computing resources.

Description

Simulation system and simulation method of direct current circuit breaker
Technical Field
The invention relates to the technical field of flexible direct current transmission of a power system, in particular to a simulation system and a simulation method of a direct current circuit breaker.
Background
The flexible direct current transmission is an important technical means for developing the intelligent power grid, and compared with a conventional direct current transmission mode, the flexible direct current transmission has stronger technical advantages in aspects of island power supply, interconnection of large-scale alternating current systems, new energy grid connection and the like, and has very wide development prospect. As one of key devices for ensuring the safe and reliable operation of a flexible direct current system, the direct current breaker plays an important role in the establishment of a direct current power grid, the improvement of the operation flexibility of the power grid, the power supply reliability and the like.
At present, in the method for switching on and off the direct current, the segmentation time of the mechanical circuit breaker is too long, and the requirement of a multi-terminal flexible direct current transmission system cannot be met; the solid-state switch based on the power electronic component has the economic problem of overlarge on-state loss. The hybrid circuit breaker combining the mechanical switch and the power electronic switch by a certain topological structure combines the advantages of low mechanical switch loss and short solid-state switch action time, and becomes the mainstream of development.
For modeling and learning of the hybrid circuit breaker in a flexible direct current system, two methods are mainly used at the present stage. The first method is equivalent to a switch with a delay function, namely, when the circuit breaker receives a turn-off signal, the action time of a mechanical switch in the hybrid circuit breaker is simulated through a certain delay, so that the system obtains the response characteristic similar to an actual circuit breaker. However, the modeling method cannot reflect the electromagnetic condition in the breaker during the breaking process, and the switching-off time of the hybrid breaker is different under different current conditions, so that the action time of replacing the breaker with a fixed delay is not accurate. The second method is to use a power electronic switch module to build a detailed hybrid circuit breaker in simulation software, and the method can accurately reflect the electromagnetic condition in the circuit breaker in the switching-off process. However, because the hybrid circuit breaker needs to use a large number of power electronic switches, the method greatly increases the scale of the matrix to be solved of the simulation system, not only reduces the simulation efficiency, but also wastes the calculation resources.
Disclosure of Invention
Aiming at the defects of the prior art, the invention aims to provide a simulation system of a direct current breaker, which simplifies the scale of a matrix to be solved in the simulation process, improves the simulation efficiency and saves a large amount of calculation resources.
The purpose of the invention is realized by adopting the following technical scheme:
the invention provides a simulation system of a direct current breaker, and the improvement is that the simulation system comprises: 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 resistance in series.
Preferably, the energy consumption branch analog circuit comprises an arrester.
The invention provides a simulation method of a simulation system of a direct current breaker, which is characterized by comprising the following steps:
judging whether a direct current breaker opening signal is received or not;
and 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 opening signal of the direct current breaker is received or not so as to simulate the running state of the direct current breaker.
Preferably, 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 whether the opening signal of the dc circuit breaker is received includes:
when the opening signal of the direct current breaker is not 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):
Figure BDA0002264368740000021
Adjusting the resistance of the first variable resistor according to the following formulaR 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):
Figure BDA0002264368740000022
Adjusting the resistance R of the second variable 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 topology of the DC breaker, delta t is the 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 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 on-voltage, V, of the IGBT device in the sub-module of the DC breaker topology 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 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 DC breaker topology e-off The switching-off resistance of the diode in the submodule of the direct current breaker topological structure.
Preferably, 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 whether the opening signal of the dc circuit breaker is received includes:
when a switching-off signal of the direct current circuit 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.
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 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):
Figure BDA0002264368740000031
Adjusting the resistance R of the first variable 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):
Figure BDA0002264368740000032
The resistance value R of the second variable resistor is adjusted 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):
Figure BDA0002264368740000033
The resistance value R of the first variable 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):
Figure BDA0002264368740000041
Adjusting the resistance R of the second variable 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 time t + Δ t, i 2 (t) is the current value i flowing through the transfer branch 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 time t + Δ t, n 1 The number of sub-modules in the main branch of the topology of the direct current 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, R, of the IGBT device in the sub-module of the DC breaker topology 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 Submodule for DC breaker topologyOff resistance of middle diode, C 1 Is the capacitance value, i, of the main branch in the topology of the DC 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 Capacitance value, i, for a transfer branch in a topology of a 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 is j-on Is the opening resistance of the mechanical switch in the main branch of the dc breaker topology.
Preferably, when the voltage value of the second controlled voltage source is greater than the preset voltage value, the lightning arrester on the energy consumption branch analog circuit is started.
Compared with the closest prior art, the invention has the following beneficial effects:
according to the technical scheme provided by the invention, the simulation system comprises: the main branch circuit analog circuit, the transfer branch circuit analog circuit and the energy consumption branch circuit analog circuit are sequentially connected in parallel; the main branch circuit analog circuit includes: a first controlled voltage source and a first adjustable resistor connected in series; the transfer branch circuit analog circuit includes: the second controlled voltage source and the second adjustable resistor which are connected in series reduce the scale of a matrix to be solved in the simulation process, improve the simulation efficiency and save a large amount of computing resources.
Drawings
Fig. 1 is a diagram of a simulation system of a dc circuit breaker;
fig. 2 is a topology structure diagram of the dc breaker.
Detailed Description
The following describes embodiments of the present invention in further detail with reference to the accompanying drawings.
In order to make the objects, 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 with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Generally, in practical applications, as shown in fig. 1, the topology of the dc circuit breaker includes: parallelly connected main branch road, transfer branch road and power consumption branch road, wherein the main branch road includes: the first parasitic inductor, the mechanical switch and the sub-modules are connected in sequence (the number of the sub-modules of the main branch can be multiple, and the value of the sub-modules is determined according to specific working conditions); the transfer branch comprises: the second parasitic inductor and the sub-module units are connected in sequence; the energy consumption branch is provided with a lightning arrester, and the sub-module unit is formed by connecting a plurality of sub-modules in series; the submodules of the submodule are composed of four power electronic devices and a capacitor.
When the direct current circuit breaker works, according to the working principle of the sub-module, the sub-module can be equivalent to a form of connecting a controlled voltage source and a resistor in series, and meanwhile, the inductor in the branch can also be regarded as a form of connecting the controlled voltage source and the resistor in series, so that the invention provides a simulation system of the direct current circuit breaker, and as shown in fig. 2, the simulation system comprises: 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 circuit analog circuit includes: a second controlled voltage source and a second adjustable resistance in series.
And the energy consumption branch analog circuit comprises an arrester. In the best embodiment of the invention, the circuit breaker can be ensured to have bidirectional conduction characteristic by arranging the voltage source and the resistor in series. By setting the R2 to simulate the turn-off of the neutron module in the transfer branch, the problem of circulation caused by different values of controlled voltage sources in the main branch and the transfer branch can be solved, and the circuit breaker model can truly reflect the operation characteristics of an actual circuit breaker.
The invention provides a simulation method of a direct current breaker based on the simulation system of the direct current breaker, which comprises the following steps:
judging whether a direct current breaker opening signal is received or not;
and 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 opening signal of the direct current breaker is received or not so as to simulate the running state of the direct current breaker.
In the specific embodiment of the invention, when the control protection module of the direct current system judges that the current flowing into the simulation system of the direct current circuit breaker is the fault current, the control protection module of the direct current system sends a direct current circuit breaker opening signal, otherwise, the control protection module of the direct current system does not send the direct current circuit breaker opening signal;
preferably, 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 whether the opening signal of the dc circuit breaker is received includes:
when the opening signal of the direct current breaker is not 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):
Figure BDA0002264368740000061
Adjusting the resistance R of the first variable 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):
Figure BDA0002264368740000062
Adjusting the resistance R of the second variable 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 straightInductance value, L, of parasitic inductances in the main branch of a circuit breaker topology 2 The inductance value of parasitic inductance in a transfer branch of the topology of the DC breaker, delta t is the 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 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 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, R, of an IGBT device in a submodule of a direct current 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 The switching-off resistance of the diode in the submodule of the direct current breaker topological structure.
When a brake-off signal of the direct-current breaker is not received, a mechanical switch of the direct-current breaker is closed, sub-modules in a main branch circuit are closed, hundreds of sub-modules in a transfer branch circuit are closed, at the moment, the value of resistance in the main branch circuit in the direct-current breaker is equal to the sum of on-resistance of an IGBT (insulated gate bipolar transistor) in the sub-modules, on-resistance of a diode and on-resistance of the mechanical switch, the value of resistance in the transfer branch circuit in the direct-current breaker is equal to the sum of off-resistance of the IGBT in the sub-modules and off-resistance of the diode, the value of resistance in the transfer branch circuit in the direct-current breaker is equal to the sum of on-resistance of the IGBT in the sub-modules and off-resistance of the diode, and the voltage of the main branch circuit and the transfer branch circuit is equal to the sum of on-voltage of the IGBT in the sub-modules in the branch circuit, the on-voltage of the diode and inductive voltage;
in order to be consistent with the electrical stress of a real direct current breaker, a first adjustable resistor of a simulation system of the direct current breaker is adjusted to be the sum of the on-resistance of an IGBT (insulated gate bipolar translator) in a main branch sub-module, the on-resistance of a diode and the on-resistance of a mechanical switch, and a second adjustable resistor is adjusted to be the sum of the off-resistance of the IGBT and the off-resistance of the diode in a transfer branch sub-module; the voltage of the first electrified voltage source is adjusted to be the sum of the conduction voltage of the IGBT, the conduction voltage of the diode and the inductance voltage of the submodule on the main branch, and the voltage of the second electrified voltage source is adjusted to be the sum of the conduction voltage of the IGBT, the conduction voltage of the diode and the inductance voltage of the submodule on the transfer branch.
Preferably, 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 whether the opening signal of the dc circuit breaker is received includes:
when a switching-off signal of the direct current circuit 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.
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 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):
Figure BDA0002264368740000071
The resistance value R of the first variable 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):
Figure BDA0002264368740000072
Adjusting the resistance R of the second variable resistor according to the following formula 2
R 2 =n 2 R I-on +n 2 R e-on
In the best embodiment of the invention, when a brake-off signal of the direct current breaker is not received and the current value flowing through the main branch circuit analog circuit is not 0, the sub-modules in the main branch circuit are turned off, hundreds of sub-modules of the transfer branch circuit are closed, the current flowing through the breaker starts to be transferred from the main branch circuit to the transfer branch circuit, at the moment, the resistance value in the main branch circuit in the direct current breaker is equal to the sum of the on-resistance of the IGBT, the on-resistance of the diode and the closed resistance of the mechanical switch in the sub-modules of the branch circuit, the resistance in the transfer branch circuit is the sum of the on-resistance of the IGBT and the on-resistance of the diode in the sub-modules of the branch circuit, the voltage of the main branch circuit is the sum of the capacitor voltage, the inductor voltage and the voltage in the previous capacitor in the branch circuit, and the voltage of the transfer branch circuit is the sum of the on-voltage of the IGBT, the diode and the inductor voltage in the sub-modules in the branch circuit;
in order to be consistent with the electrical stress of a real direct current breaker, the first adjustable resistor is adjusted to be the sum of the on-resistance of an IGBT (insulated gate bipolar translator) in a submodule of a main branch circuit, the on-resistance of a diode and the on-resistance of a mechanical switch, and the second adjustable resistor is adjusted to be the sum of the on-resistance of the IGBT and the on-resistance of the diode in a submodule of a transfer branch circuit; the voltage of the first electrified voltage source is adjusted to be the sum of the capacitor voltage and the inductor voltage of the main branch circuit and the capacitor voltage of the previous sub-module, and the voltage of the second electrified voltage source is adjusted to be the sum of the conduction voltage of the IGBT, the conduction voltage of the diode and the inductor voltage of the sub-module of the transfer branch circuit.
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):
Figure BDA0002264368740000081
Adjusting the first variable resistance byResistance value R of 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):
Figure BDA0002264368740000082
Adjusting the resistance R of the second variable 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 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 sub-modules in the main branch of the topology of the direct current 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, R, of an IGBT device in a submodule of a direct current breaker topology 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 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) flows through at time t-2 Δ tCurrent value, u, of the main branch analog circuit 1 (t- Δ t) is the voltage value of the first controlled voltage source at time t- Δ t, C 2 Capacitance value, i, for a transfer branch in a topology of a DC breaker 2 (t-2 Δ t) is the value of the current flowing through the transfer branch at time t-2 Δ t, u 2 (t- Δ t) is the voltage value of the second controlled voltage source at the time t- Δ t; r j-on Is the opening resistance of a mechanical switch in the main branch of the direct current breaker topology.
In the best embodiment of the invention, when a brake-off signal of the direct current breaker is not received and the current value flowing through the main branch circuit analog circuit is not 0, the mechanical switch is opened, after the machine is completely opened, the sub-module unit of the transfer branch circuit is turned off, at the moment, the resistance value in the main branch circuit in the direct current breaker is equal to the resistance of the branch circuit when the mechanical switch is opened, the resistance in the transfer branch circuit is the sum of the on-resistance of the IGBT and the on-resistance of the diode in the sub-module of the branch circuit, the voltage of the main branch circuit is the sum of the voltage of the capacitor, the voltage of the inductor and the voltage in the previous capacitor in the branch circuit, and the voltage of the transfer branch circuit is the sum of the voltage of the capacitor, the voltage of the inductor and the voltage in the previous capacitor in the branch circuit;
in order to be consistent with the electrical stress of a real direct current breaker, the first adjustable resistor is adjusted to be the resistance when a mechanical switch in a submodule of a main branch circuit is opened, and the second adjustable resistor is adjusted to be the sum of the on-resistance of an IGBT and the on-resistance of a diode in a submodule of a transfer branch circuit; the voltage of the first electrified voltage source is adjusted to be the sum of the capacitor voltage and the inductor voltage on the main branch circuit and the capacitor voltage in the previous sub-module, and the voltage of the second electrified voltage source is adjusted to be the sum of the capacitor voltage and the inductor voltage on the transfer branch circuit 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 lightning arrester on the energy consumption branch analog circuit is started.
In a preferred embodiment of the invention, when the voltage of the dc breaker transfer branch exceeds a preset voltage, the arrester of the energy consuming branch is activated, at which time the current flows through the energy consuming branch. When the current flowing through the energy consumption branch circuit is reduced to 0, the fault is isolated; in order to be consistent with the real electrical stress of the direct current breaker, in the technical scheme provided by the invention, when the voltage value of the second controlled voltage source is greater than the preset voltage value, the lightning arrester on the energy consumption branch circuit analog circuit is started.
As will be appreciated by one skilled in the art, embodiments of the present application may be provided as a method, system, or computer program product. 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, and the like) having computer-usable program code embodied therein.
The present application is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the application. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solutions of the present invention and not for limiting the same, and although the present invention is described in detail with reference to the above embodiments, those of ordinary skill in the art should understand that: modifications and equivalents may be made to the embodiments of the invention without departing from the spirit and scope of the invention, which is to be covered by the claims.

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):
Figure FDA0003838997780000011
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):
Figure FDA0003838997780000012
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):
Figure FDA0003838997780000021
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):
Figure FDA0003838997780000031
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):
Figure FDA0003838997780000032
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):
Figure FDA0003838997780000033
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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