CN107729690B - Simulation method and device for direct-current power distribution and utilization system - Google Patents
Simulation method and device for direct-current power distribution and utilization system Download PDFInfo
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Abstract
The invention discloses a simulation method and a simulation device for a direct-current power distribution and utilization system, which solve the technical problem that the prior art does not have a simulation method for the direct-current power distribution and utilization system comprising a power electronic converter and a direct-current circuit breaker, so that the basis and the reference for the actual development and the test of the direct-current power distribution and utilization system are lacked.
Description
Technical Field
The invention relates to the field of power simulation, in particular to a simulation method and device for a direct-current power distribution and utilization system.
Background
In recent years, a direct current power distribution and utilization technology is widely considered as a main development direction in the field of power distribution and new energy, and a direct current-based related technology is paid much attention, however, for research and development and application of the direct current power distribution and utilization technology, a direct current power distribution system is required to be put into practical use, theoretical research is firstly required to determine a topological structure of the direct current power distribution system, and then simulation verification is required to provide bases and references for subsequent actual development and experiments, wherein a power electronic converter and a direct current circuit breaker are key equipment and simulation objects in the direct current power distribution and utilization system. In a direct current distribution system, an alternating current-direct current system is connected, power distribution buses with different voltage levels need to realize power exchange through a power electronic converter, the performance of the direct current-direct current system directly determines working parameters such as power, stability and the like of a power distribution and utilization system, in addition, a direct current breaker is needed for providing support when the direct current system is subjected to fault isolation and disconnection, and compared with an alternating current system, the direct current system is lack of zero crossing points, so that the breaker is more difficult to develop.
In the prior art, a simulation method for a direct current distribution power system comprising a power electronic converter and a direct current breaker is not provided, so that the technical problem that the basis and reference for actual development and test of the direct current distribution power system are lacked is caused.
Disclosure of Invention
The invention provides a simulation method and a simulation device for a direct-current power distribution and utilization system, which are used for solving the technical problem that the prior art lacks of basis and reference for actual development and test of the direct-current power distribution and utilization system due to the fact that a simulation method for the direct-current power distribution and utilization system comprising a power electronic converter and a direct-current breaker does not exist.
The invention provides a simulation method of a direct-current power distribution and utilization system, which comprises the following steps:
constructing a direct current power distribution system topological structure, wherein the topological structure comprises: the circuit comprises a line, a power electronic converter, a direct current breaker and a load, wherein the power electronic converter specifically comprises: an MMC converter, the DC circuit breaker comprising: the system comprises a mechanical switch model branch, a solid-state switch model branch and a voltage-limiting buffer absorption model branch, wherein the mechanical switch model branch, the solid-state switch model branch and the voltage-limiting buffer absorption model branch are connected in parallel;
determining simulation parameters of the topological structure of the direct current power distribution system, wherein the simulation parameters comprise: the direct current voltage class, the line length, the interelectrode capacitance, the valve side inductance of the MMC converter, the filter capacitance of the MMC converter, the bridge arm reactance of the MMC converter, the line resistance, the line capacitance, the line inductance and the load reactance;
determining simulation parameters of the power electronic converter, the simulation parameters comprising: maximum capacity, alternating voltage, direct voltage, the number of submodules, selectable submodule nominal, submodule capacitor and bridge arm reactance;
determining the arcing resistance of the mechanical switch model branch according to an arc voltage-current curve;
setting an action time sequence of the direct current circuit breaker;
and determining the boundary state and the boundary constraint condition of the direct current power distribution system, and simulating the direct current power distribution system according to the topological structure of the direct current power distribution system, the boundary state and the boundary constraint condition.
Preferably, the building of the topology of the direct current power distribution system includes: the circuit comprises a line, a power electronic converter, a direct current breaker and a load, wherein the power electronic converter specifically comprises: an MMC converter; specifically comprises the following steps of;
constructing a direct current power distribution system topological structure, wherein the topological structure comprises: the system comprises a first alternating current power supply, a first switch, a first alternating current transformer, a first fully-controlled current converter, a first inductor, a first direct current breaker, first one-way current conversion equipment, a second fully-controlled current converter, a sensitive load, an alternating current microgrid, a direct current load, a first direct current transformer, a first one-way direct current transformer, a direct current microgrid, a second direct current breaker, a second inductor, a third fully-controlled current converter, a second alternating current transformer, a second switch and a second alternating current power supply, wherein the first fully-controlled current converter, the second fully-controlled current converter, the third fully-controlled current converter and the first one-way current conversion equipment are specifically as follows: an MMC converter;
the first ac power source is connected to the first ac transformer through the first switch, the first ac transformer is connected to the first inductor through the first fully-controlled converter, the first inductor is connected to the first unidirectional converter device through the first dc breaker, the first unidirectional converter device is connected to the sensitive load, the second fully-controlled converter is connected to the ac microgrid, the first unidirectional dc transformer is connected to the dc load, the first dc transformer is connected to the dc microgrid, the first unidirectional converter device, the first fully-controlled converter, the first dc transformer and the first unidirectional dc transformer are sequentially connected in series, the first dc breaker is connected to the second dc breaker, and the second dc breaker is connected to the third fully-controlled converter through the second inductor, the third fully-controlled converter is connected with the second alternating current transformer, and the second alternating current transformer is connected with the second alternating current power supply through the second switch.
Preferably, the determining simulation parameters of the power electronic converter comprises: maximum capacity, alternating voltage, direct voltage, the number of submodules, selectable submodule nominal, submodule capacitor and bridge arm reactance; the method specifically comprises the following steps:
determining simulation parameters of the first fully-controlled converter, the second fully-controlled converter, the third fully-controlled converter and the first unidirectional converter device, wherein the simulation parameters comprise: maximum capacity, alternating voltage, direct voltage, number of submodules, selectable submodule nominal, submodule capacitor and bridge arm reactance.
Preferably, the pressure-limiting buffering absorption model branch specifically includes:
the device comprises an RC buffer absorption branch and a metal oxide piezoresistor voltage limiting branch, wherein the RC buffer absorption branch is connected with the metal oxide piezoresistor voltage limiting branch in parallel.
Preferably, the setting of the action sequence of the direct current circuit breaker specifically includes:
when the direct current distribution power system has a short-circuit fault, sending a trigger signal to a mechanical switch of the mechanical switch model branch circuit to switch on or off the mechanical switch;
when a solid-state switch in the solid-state switch model branch is switched off, sending a switching-on signal to the solid-state switch to switch on the solid-state switch;
and when the short-circuit current is transferred to the solid-state switch model branch circuit and the voltage at the two ends of the mechanical switch is lower than a first preset voltage, sending a switching-off signal to the solid-state switch to switch off the solid-state switch.
The invention provides a simulation device of a direct-current power distribution and utilization system, which comprises:
the first building module is used for building a topological structure of a direct current power distribution system, and the topological structure comprises: the circuit comprises a line, a power electronic converter, a direct current breaker and a load, wherein the power electronic converter specifically comprises: an MMC converter, wherein the DC breaker comprises: the system comprises a mechanical switch model branch, a solid-state switch model branch and a voltage-limiting buffer absorption model branch, wherein the mechanical switch model branch, the solid-state switch model branch and the voltage-limiting buffer absorption model branch are connected in parallel;
a first determining module, configured to determine simulation parameters of the topology of the dc power distribution system, where the simulation parameters include: the direct current voltage class, the line length, the interelectrode capacitance, the valve side inductance of the MMC converter, the filter capacitance of the MMC converter, the bridge arm reactance of the MMC converter, the line resistance, the line capacitance, the line inductance and the load reactance;
a second determination module for determining simulation parameters of the power electronic converter, the simulation parameters comprising: maximum capacity, alternating voltage, direct voltage, the number of submodules, selectable submodule nominal, submodule capacitor and bridge arm reactance;
the third determining module is used for determining the arcing resistance of the mechanical switch model branch according to an arc voltage-current curve;
the setting module is used for setting the action time sequence of the direct current circuit breaker;
the fourth determining module is used for determining the boundary state and the boundary constraint condition of the direct current power distribution system;
and the simulation module is used for simulating the direct-current power distribution system according to the topological structure of the direct-current power distribution system, the boundary state and the boundary constraint condition.
Preferably, the first building block is specifically configured to:
constructing a direct current power distribution system topological structure, wherein the topological structure comprises: the system comprises a first alternating current power supply, a first switch, a first alternating current transformer, a first fully-controlled current converter, a first inductor, a first direct current breaker, first one-way current conversion equipment, a second fully-controlled current converter, a sensitive load, an alternating current microgrid, a direct current load, a first direct current transformer, a first one-way direct current transformer, a direct current microgrid, a second direct current breaker, a second inductor, a third fully-controlled current converter, a second alternating current transformer, a second switch and a second alternating current power supply, wherein the first fully-controlled current converter, the second fully-controlled current converter, the third fully-controlled current converter and the first one-way current conversion equipment are specifically as follows: an MMC converter, the first DC breaker and the second DC breaker include: the system comprises a mechanical switch model branch, a solid-state switch model branch and a voltage-limiting buffer absorption model branch, wherein the mechanical switch model branch, the solid-state switch model branch and the voltage-limiting buffer absorption model branch are connected in parallel;
the first ac power source is connected to the first ac transformer through the first switch, the first ac transformer is connected to the first inductor through the first fully-controlled converter, the first inductor is connected to the first unidirectional converter device through the first dc breaker, the first unidirectional converter device is connected to the sensitive load, the second fully-controlled converter is connected to the ac microgrid, the first unidirectional dc transformer is connected to the dc load, the first dc transformer is connected to the dc microgrid, the first unidirectional converter device, the first fully-controlled converter, the first dc transformer and the first unidirectional dc transformer are sequentially connected in series, the first dc breaker is connected to the second dc breaker, and the second dc breaker is connected to the third fully-controlled converter through the second inductor, the third fully-controlled converter is connected with the second alternating current transformer, and the second alternating current transformer is connected with the second alternating current power supply through the second switch.
Preferably, the second determining module is specifically configured to:
determining simulation parameters of the first fully-controlled converter, the second fully-controlled converter, the third fully-controlled converter and the first unidirectional converter device, wherein the simulation parameters comprise: maximum capacity, alternating voltage, direct voltage, number of submodules, selectable submodule nominal, submodule capacitor and bridge arm reactance.
Preferably, the first building block is specifically configured to:
constructing a direct current power distribution system topological structure, wherein the topological structure comprises: the system comprises a first alternating current power supply, a first switch, a first alternating current transformer, a first fully-controlled current converter, a first inductor, a first direct current breaker, first one-way current conversion equipment, a second fully-controlled current converter, a sensitive load, an alternating current microgrid, a direct current load, a first direct current transformer, a first one-way direct current transformer, a direct current microgrid, a second direct current breaker, a second inductor, a third fully-controlled current converter, a second alternating current transformer, a second switch and a second alternating current power supply, wherein the first fully-controlled current converter, the second fully-controlled current converter, the third fully-controlled current converter and the first one-way current conversion equipment are specifically as follows: an MMC converter, the first DC breaker and the second DC breaker include: the circuit comprises a mechanical switch model branch, a solid-state switch model branch and a voltage limiting buffer absorption model branch, wherein the mechanical switch model branch, the solid-state switch model branch and the voltage limiting buffer absorption model branch are connected in parallel, and the voltage limiting buffer absorption model branch specifically comprises: the RC buffer absorption branch circuit is connected with the metal oxide piezoresistor voltage limiting branch circuit in parallel;
the first ac power source is connected to the first ac transformer through the first switch, the first ac transformer is connected to the first inductor through the first fully-controlled converter, the first inductor is connected to the first unidirectional converter device through the first dc breaker, the first unidirectional converter device is connected to the sensitive load, the second fully-controlled converter is connected to the ac microgrid, the first unidirectional dc transformer is connected to the dc load, the first dc transformer is connected to the dc microgrid, the first unidirectional converter device, the first fully-controlled converter, the first dc transformer and the first unidirectional dc transformer are sequentially connected in series, the first dc breaker is connected to the second dc breaker, and the second dc breaker is connected to the third fully-controlled converter through the second inductor, the third fully-controlled converter is connected with the second alternating current transformer, and the second alternating current transformer is connected with the second alternating current power supply through the second switch.
Preferably, the second determining module is specifically configured to:
determining simulation parameters of the first fully-controlled converter, the second fully-controlled converter, the third fully-controlled converter and the first unidirectional converter device, wherein the simulation parameters comprise: maximum capacity, alternating voltage, direct voltage, number of submodules, selectable submodule nominal, submodule capacitor and bridge arm reactance.
Preferably, the tuning module specifically includes:
the first sending submodule is used for sending a trigger signal to a mechanical switch of the mechanical switch model branch circuit to enable the mechanical switch to be switched on and off after the direct-current power distribution system has a short-circuit fault;
the second sending submodule is used for sending a conducting signal to the solid-state switch after the solid-state switch in the solid-state switch model branch circuit is switched on, so that the solid-state switch is conducted;
and the third sending submodule is used for sending a switching-on/off signal to the solid-state switch after the short-circuit current is transferred to the solid-state switch model branch circuit and the voltage at the two ends of the mechanical switch is lower than the first preset voltage, so that the solid-state switch is switched on and off.
According to the technical scheme, the invention has the following advantages:
the invention provides a simulation method of a direct-current power distribution and utilization system, which comprises the following steps: constructing a direct current power distribution system topological structure, wherein the topological structure comprises: the circuit comprises a line, a power electronic converter, a direct current breaker and a load, wherein the power electronic converter specifically comprises: an MMC converter, the DC circuit breaker comprising: the system comprises a mechanical switch model branch, a solid-state switch model branch and a voltage-limiting buffer absorption model branch, wherein the mechanical switch model branch, the solid-state switch model branch and the voltage-limiting buffer absorption model branch are connected in parallel; determining simulation parameters of the topological structure of the direct current power distribution system, wherein the simulation parameters comprise: the direct current voltage class, the line length, the interelectrode capacitance, the valve side inductance of the MMC converter, the filter capacitance of the MMC converter, the bridge arm reactance of the MMC converter, the line resistance, the line capacitance, the line inductance and the load reactance; determining simulation parameters of the power electronic converter, the simulation parameters comprising: maximum capacity, alternating voltage, direct voltage, the number of submodules, selectable submodule nominal, submodule capacitor and bridge arm reactance; determining the arcing resistance of the mechanical switch model branch according to an arc voltage-current curve; setting an action time sequence of the direct current circuit breaker; and determining the boundary state and the boundary constraint condition of the direct current power distribution system, and simulating the direct current power distribution system according to the topological structure of the direct current power distribution system, the boundary state and the boundary constraint condition.
According to the invention, by constructing the topological structure of the direct current distribution system, determining the simulation parameters, the boundary state and the boundary constraint conditions of the topological structure, and performing the system simulation of the direct current distribution power according to the topological structure and the simulation parameters, the technical problem that the actual development and test basis and reference of the direct current distribution power system are lacked because a simulation method for the direct current distribution power system comprising a power electronic converter and a direct current breaker is not available in the prior art is solved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without inventive exercise.
Fig. 1 is a schematic flow chart of an embodiment of a simulation method of a dc power distribution system according to the present invention;
fig. 2 is a schematic flow chart of another embodiment of a simulation method of a dc power distribution system according to the present invention;
FIG. 3 is a waveform diagram illustrating a simulated fault process for different inter-electrode capacitance values according to the present invention;
FIG. 4 is a waveform diagram of a simulated fault process for different current-limiting inductance values according to the present invention;
FIG. 5 is a waveform diagram of a simulated fault process for different load resistance values according to the present invention;
FIG. 6 is a waveform diagram of a simulated fault process for different line capacitance values in accordance with the present invention;
FIG. 7 is a waveform diagram of a simulated fault process for different line resistance values according to the present invention;
fig. 8 is a schematic flow chart of an embodiment of a simulation apparatus for a dc power distribution system according to the present invention.
Detailed Description
The embodiment of the invention provides a simulation method for a direct-current power distribution and utilization system, which is used for solving the technical problem that the prior art lacks basis and reference for actual development and test of the direct-current power distribution and utilization system due to the fact that the simulation method for the direct-current power distribution and utilization system comprising a power electronic converter and a direct-current breaker does not exist.
In order to make the objects, features and advantages of the present invention more obvious and understandable, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the embodiments described below are only a part of the embodiments of the present invention, and not all of the embodiments. 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.
The terms "first," "second," "third," and the like in the description and in the claims, and in the above-described drawings, are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It will be appreciated that the data so used may be interchanged where appropriate.
Referring to fig. 1, a simulation method of a dc power distribution system according to an embodiment of the present invention includes:
101: constructing a topological structure of the direct current power distribution system, wherein the topological structure comprises: the circuit comprises a circuit, a power electronic converter, a direct current breaker and a load, wherein the power electronic converter specifically comprises: MMC converter, direct current breaker include: the system comprises a mechanical switch model branch, a solid-state switch model branch and a voltage limiting buffer absorption model branch, wherein the mechanical switch model branch, the solid-state switch model branch and the voltage limiting buffer absorption model branch are connected in parallel;
102: determining simulation parameters of a topological structure of the direct-current power distribution system, wherein the simulation parameters comprise: the direct current voltage class, the line length, the interelectrode capacitance, the valve side inductance of the MMC converter, the filter capacitance of the MMC converter, the bridge arm reactance of the MMC converter, the line resistance, the line capacitance, the line inductance and the load reactance;
103: determining simulation parameters of the power electronic converter, wherein the simulation parameters comprise: maximum capacity, alternating voltage, direct voltage, the number of submodules, selectable submodule nominal, submodule capacitor and bridge arm reactance;
104: determining the arcing resistance of the mechanical switch model branch according to the arc voltage-current curve;
105: setting an action time sequence of the direct current breaker;
106: and determining the boundary state and the boundary constraint condition of the direct current power distribution system, and simulating the direct current power distribution system according to the topological structure, the boundary state and the boundary constraint condition of the direct current power distribution system.
In the embodiment of the invention, the technical problem that the basis and reference for actual development and test of the direct-current power distribution system are lacked because a simulation method aiming at the direct-current power distribution system comprising a power electronic converter and a direct-current breaker is not available in the prior art is solved by constructing the topological structure of the direct-current power distribution system, determining the simulation parameters, the boundary state and the boundary constraint conditions of the topological structure and carrying out the system simulation of the direct-current power distribution according to the topological structure and the simulation parameters.
The above is a description of an embodiment of a simulation method for a dc power distribution system, and another embodiment of a simulation method for a dc power distribution system will be described in detail below.
Referring to fig. 2, a simulation method of a dc power distribution system according to an embodiment of the present invention includes:
201: constructing a topological structure of the direct current power distribution system, wherein the topological structure comprises: the system comprises a first alternating current power supply, a first switch, a first alternating current transformer, a first fully-controlled converter, a first inductor, a first direct current breaker, first one-way converter equipment, a second fully-controlled converter, a sensitive load, an alternating current microgrid, a direct current load, a first direct current transformer, a first one-way direct current transformer, a direct current microgrid, a second direct current breaker, a second inductor, a third fully-controlled converter, a second alternating current transformer, a second switch and a second alternating current power supply, wherein the first fully-controlled converter, the second fully-controlled converter, the third fully-controlled converter and the first one-way converter equipment are specifically as follows: an MMC converter;
a first alternating current power supply is connected with a first alternating current transformer through a first switch, the first alternating current transformer is connected with a first inductor through a first fully-controlled current converter, the first inductor is connected with first one-way current conversion equipment through a first direct current breaker, the first one-way current conversion equipment is connected with a sensitive load, a second fully-controlled current converter is connected with an alternating current microgrid, a first one-way direct current transformer is connected with a direct current load, the first direct current transformer is connected with the direct current microgrid, the first one-way current conversion equipment and the first fully-controlled current converter are connected, the first direct current transformer and the first unidirectional direct current transformer are sequentially connected in series, the first direct current breaker is connected with the second direct current breaker, the second direct current breaker is connected with the third fully-controlled converter through a second inductor, the third fully-controlled converter is connected with the second alternating current transformer, and the second alternating current transformer is connected with the second alternating current power supply through a second switch;
the first and second dc breakers include: the system comprises a mechanical switch model branch, a solid-state switch model branch and a voltage limiting buffer absorption model branch, wherein the mechanical switch model branch, the solid-state switch model branch and the voltage limiting buffer absorption model branch are connected in parallel;
in terms of selecting parameters of the direct current breaker, as an example, the most severe condition is considered, an inter-electrode short-circuit fault at the outlet of the commutation equipment is set, the fault time is 0.6s, and the fault automatically disappears after 0.05 s. The solid-state switch branch circuit considers that IGBT elements of 3.3kV/1500A are connected in series and parallel to form a switch group of 2 parallel/11 series, 22 elements are used in total, the maximum turn-off current is 3kA, the instantaneous turn-off current can reach 5-6 kA within 1-3 ms, the conduction voltage drop is 2.5 multiplied by 11 which is 27.5V, and the whole voltage drop of the branch circuit is about 30V. In order to ensure that the arcing voltage exceeds the conduction voltage drop of the solid-state switch group, the actual curve is translated to a higher voltage integrally by referring to the vacuum arc arcing voltage data, and the curve variation trend is unchanged. The breaking time of a solid-state switch is set to be 0.6018ms for the circuit breaker, the rated voltage of an MOV branch lightning arrester is set to be 17.0kV for the buffer voltage-limiting branch, the residual voltage under 3.8kA steep wave impact current (1 mus/5 mus) is set to be 6kV, and simulation shows that the 1 st time of the current flowing through the circuit breaker is reduced to 0A after 4.5 ms. Therefore, the circuit breaker can rapidly cut off the fault current within 5ms, limit the peak value of the fault current and protect system equipment from being burnt.
202: determining simulation parameters of a topological structure of the direct-current power distribution system, wherein the simulation parameters comprise: the direct current voltage class, the line length, the interelectrode capacitance, the valve side inductance of the MMC converter, the filter capacitance of the MMC converter, the bridge arm reactance of the MMC converter, the line resistance, the line capacitance, the line inductance and the load reactance;
203: determining simulation parameters of a first full-control type current converter, a second full-control type current converter, a third full-control type current converter and first unidirectional current conversion equipment, wherein the simulation parameters comprise: maximum capacity, alternating voltage, direct voltage, the number of submodules, selectable submodule nominal, submodule capacitor and bridge arm reactance;
204: determining the arcing resistance of the mechanical switch model branch according to the arc voltage-current curve;
205: when the direct current distribution power system has a short-circuit fault, sending a trigger signal to a mechanical switch of a mechanical switch model branch so as to switch on or off the mechanical switch;
206: when a solid-state switch in the solid-state switch model branch is switched off, a conducting signal is sent to the solid-state switch, so that the solid-state switch is conducted;
207: and when the short-circuit current is transferred to the branch circuit of the solid-state switch model and the voltage at the two ends of the mechanical switch is lower than a first preset voltage, sending a switching-off signal to the solid-state switch to switch off the solid-state switch.
208: and determining the boundary state and the boundary constraint condition of the direct current power distribution system, and simulating the direct current power distribution system according to the topological structure, the boundary state and the boundary constraint condition of the direct current power distribution system.
Referring to fig. 3, fig. 3 is a waveform diagram of a simulated fault process for setting different interelectrode capacitance values.
The interelectrode capacitance values are set to be 1500 muF, 3000 muF, 4500 muF and 6000 muF respectively, a fault process waveform is obtained, and the interelectrode capacitance discharges through a fault point in the interelectrode short-circuit fault process, so that the larger the interelectrode capacitance is, the higher the short-circuit peak current is, the larger the corresponding current rising rate is, the smaller the voltage falling rate is, and the higher the recovery instantaneous voltage peak value is.
Referring to fig. 4, fig. 4 is a waveform diagram of a simulated fault process with different current-limiting inductance values.
The current-limiting inductance values are respectively set to be 1, 2, 4, 20 and 200mH, a fault process waveform is obtained, the current-limiting inductance is similar to a high-frequency reactance in a fault period, the peak value of short-circuit current can be limited, the time of the peak value of the short-circuit current can be delayed by reducing the rising rate of the short-circuit current, but the recovery voltage peak value after the fault is removed is very high.
Referring to fig. 5, fig. 5 is a waveform diagram of a simulated fault process with different load resistance values.
Respectively setting the load resistance values to be 10, 15, 20 and 25 omega to obtain a fault process waveform, wherein if the steady-state voltage or the constant current of the system is not considered, the larger the load resistance is, the smaller the steady-state current of the system is, and the higher the steady-state voltage is; no matter the magnitude of the steady-state current, after a fault occurs, the peak value of the fault current is 7-9 kV, the time for reaching the peak value is about 10ms, because load resistance has no influence on a system after a short-circuit fault occurs, the fault voltage and current rising rate gradually rise along with the increase of the load resistance, the peak value of the fault current gradually increases, at the moment of fault removal, the voltage and current rising rate increases along with the increase of the load resistance, the recovery voltage has an oscillation process, and the amplitude gradually increases.
Referring to fig. 6, fig. 6 is a waveform diagram of a simulated fault process with different line capacitance values.
The line capacitance values are respectively set to be 0.075, 0.15, 0.30 and 0.60 muF, a fault process waveform is obtained, it can be seen that the change of the line capacitance has no influence on the steady-state voltage and current, the current rise rate at the fault moment is relatively close, but no obvious change trend exists, and the voltage amplitude is reduced along with the increase of the line capacitance.
Referring to fig. 7, fig. 7 is a waveform diagram of a simulated fault process with different line resistance values.
The resistance values of the lines are respectively set to be 0.075, 0.15, 0.30 and 0.60 omega, the waveform of the fault process is obtained, the line resistance almost has no influence on the steady-state voltage and current, the current peak value is gradually reduced in the fault stage along with the increase of the line resistance, and the current and voltage rising rate is gradually reduced; after the fault is removed, the voltage and current rising rate is gradually reduced, the voltage peak value is gradually reduced, and the voltage oscillation amplitude is also gradually reduced.
The above is a description of an embodiment of a simulation method for a dc power distribution system, and a detailed description of an embodiment of a simulation apparatus for a dc power distribution system is provided below.
Referring to fig. 8, an embodiment of the present invention provides a dc power distribution system simulation apparatus, including:
a first building module 801, configured to build a topology of a dc power distribution system, where the topology includes: the system comprises a first alternating current power supply, a first switch, a first alternating current transformer, a first fully-controlled converter, a first inductor, a first direct current breaker, first one-way converter equipment, a second fully-controlled converter, a sensitive load, an alternating current microgrid, a direct current load, a first direct current transformer, a first one-way direct current transformer, a direct current microgrid, a second direct current breaker, a second inductor, a third fully-controlled converter, a second alternating current transformer, a second switch and a second alternating current power supply, wherein the first fully-controlled converter, the second fully-controlled converter, the third fully-controlled converter and the first one-way converter equipment are specifically as follows: the MMC transverter, first direct current breaker and second direct current breaker include: mechanical switch model branch road, solid-state switch model branch road and voltage limiting buffering absorption model branch road, mechanical switch model branch road, solid-state switch model branch road and voltage limiting buffering absorption model branch road parallel connection, wherein, voltage limiting buffering absorption model branch road specifically includes: the RC buffer absorption branch and the metal oxide piezoresistor voltage limiting branch are connected in parallel;
a first alternating current power supply is connected with a first alternating current transformer through a first switch, the first alternating current transformer is connected with a first inductor through a first fully-controlled current converter, the first inductor is connected with first one-way current conversion equipment through a first direct current breaker, the first one-way current conversion equipment is connected with a sensitive load, a second fully-controlled current converter is connected with an alternating current microgrid, a first one-way direct current transformer is connected with a direct current load, the first direct current transformer is connected with the direct current microgrid, the first one-way current conversion equipment and the first fully-controlled current converter are connected, the first direct current transformer and the first unidirectional direct current transformer are sequentially connected in series, the first direct current breaker is connected with the second direct current breaker, the second direct current breaker is connected with the third fully-controlled converter through a second inductor, the third fully-controlled converter is connected with the second alternating current transformer, and the second alternating current transformer is connected with the second alternating current power supply through a second switch;
a first determining module 802, configured to determine simulation parameters of a topology of a dc power distribution system, where the simulation parameters include: the direct current voltage class, the line length, the interelectrode capacitance, the valve side inductance of the MMC converter, the filter capacitance of the MMC converter, the bridge arm reactance of the MMC converter, the line resistance, the line capacitance, the line inductance and the load reactance;
a second determining module 803, configured to determine simulation parameters of the first fully controlled converter, the second fully controlled converter, the third fully controlled converter, and the first unidirectional converter device, where the simulation parameters include: maximum capacity, alternating voltage, direct voltage, the number of submodules, selectable submodule nominal, submodule capacitor and bridge arm reactance;
a third determining module 804, configured to determine an arcing resistance of the mechanical switch model branch according to the arc voltage-current curve;
the setting module 805 specifically includes:
the first sending submodule 8051 is configured to send a trigger signal to a mechanical switch of the mechanical switch model branch to turn on or off the mechanical switch when the direct-current power distribution system has a short-circuit fault;
the second sending submodule 8052 is configured to send a conducting signal to the solid-state switch to conduct the solid-state switch after the solid-state switch in the solid-state switch model branch is turned on;
the third sending submodule 8053 is configured to send a switching-off signal to the solid-state switch to switch off the solid-state switch when the short-circuit current is transferred to the branch of the solid-state switch model and the voltage at the two ends of the mechanical switch is lower than the first preset voltage.
A fourth determining module 806, configured to determine a boundary state and a boundary constraint condition of the dc power distribution system;
the simulation module 807 is configured to perform simulation of the dc power distribution system according to the topology, the boundary state, and the boundary constraint condition of the dc power distribution system.
It is clear to those skilled in the art that, for convenience and brevity of description, the specific working processes of the above described systems, systems and units may refer to the corresponding processes in the foregoing method embodiments, and are not described herein again.
In the several embodiments provided in the present application, it should be understood that the disclosed system, apparatus and method may be implemented in other manners. For example, the above-described apparatus embodiments are merely illustrative, and for example, the division of the units is only one logical division, and other divisions may be realized in practice, for example, a plurality of units or components may be combined or integrated into another system, or some features may be omitted, or not executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection through some interfaces, devices or units, and may be in an electrical, mechanical or other form.
The units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of the embodiment.
In addition, functional units in the embodiments of the present invention may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit. The integrated unit can be realized in a form of hardware, and can also be realized in a form of a software functional unit.
The above-mentioned embodiments are only used for illustrating the technical solutions of the present invention, and not for limiting the same; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (9)
1. A simulation method of a direct current power distribution system is characterized by comprising the following steps:
constructing a direct current power distribution system topological structure, wherein the topological structure comprises: the circuit comprises a line, a power electronic converter, a direct current breaker and a load, wherein the power electronic converter specifically comprises: an MMC converter, the DC circuit breaker comprising: the system comprises a mechanical switch model branch, a solid-state switch model branch and a voltage-limiting buffer absorption model branch, wherein the mechanical switch model branch, the solid-state switch model branch and the voltage-limiting buffer absorption model branch are connected in parallel;
determining simulation parameters of the topological structure of the direct current power distribution system, wherein the simulation parameters comprise: the direct current voltage class, the line length, the interelectrode capacitance, the valve side inductance of the MMC converter, the filter capacitance of the MMC converter, the bridge arm reactance of the MMC converter, the line resistance, the line capacitance, the line inductance and the load reactance;
determining simulation parameters of the power electronic converter, the simulation parameters comprising: maximum capacity, alternating voltage, direct voltage, the number of submodules, selectable submodule nominal, submodule capacitor and bridge arm reactance;
determining the arcing resistance of the mechanical switch model branch according to an arc voltage-current curve;
setting an action time sequence of the direct current circuit breaker;
and determining the boundary state and the boundary constraint condition of the direct current power distribution system, and simulating the direct current power distribution system according to the topological structure of the direct current power distribution system, the boundary state and the boundary constraint condition.
2. The method for simulating a dc power distribution system according to claim 1, wherein the constructing a topology of the dc power distribution system comprises: the circuit comprises a line, a power electronic converter, a direct current breaker and a load, wherein the power electronic converter specifically comprises: an MMC converter; the method specifically comprises the following steps:
constructing a direct current power distribution system topological structure, wherein the topological structure comprises: the system comprises a first alternating current power supply, a first switch, a first alternating current transformer, a first fully-controlled current converter, a first inductor, a first direct current breaker, first one-way current conversion equipment, a second fully-controlled current converter, a sensitive load, an alternating current microgrid, a direct current load, a first direct current transformer, a first one-way direct current transformer, a direct current microgrid, a second direct current breaker, a second inductor, a third fully-controlled current converter, a second alternating current transformer, a second switch and a second alternating current power supply, wherein the first fully-controlled current converter, the second fully-controlled current converter, the third fully-controlled current converter and the first one-way current conversion equipment are specifically as follows: an MMC converter;
the first ac power source is connected to the first ac transformer through the first switch, the first ac transformer is connected to the first inductor through the first fully-controlled converter, the first inductor is connected to the first unidirectional converter device through the first dc breaker, the first unidirectional converter device is connected to the sensitive load, the second fully-controlled converter is connected to the ac microgrid, the first unidirectional dc transformer is connected to the dc load, the first dc transformer is connected to the dc microgrid, the first unidirectional converter device, the first fully-controlled converter, the first dc transformer and the first unidirectional dc transformer are sequentially connected in series, the first dc breaker is connected to the second dc breaker, and the second dc breaker is connected to the third fully-controlled converter through the second inductor, the third fully-controlled converter is connected with the second alternating current transformer, and the second alternating current transformer is connected with the second alternating current power supply through the second switch.
3. The method for simulating a dc power distribution system according to claim 2, wherein the determining simulation parameters of the power electronic converter includes: maximum capacity, alternating voltage, direct voltage, the number of submodules, selectable submodule nominal, submodule capacitor and bridge arm reactance; the method specifically comprises the following steps:
determining simulation parameters of the first fully-controlled converter, the second fully-controlled converter, the third fully-controlled converter and the first unidirectional converter device, wherein the simulation parameters comprise: maximum capacity, alternating voltage, direct voltage, number of submodules, selectable submodule nominal, submodule capacitor and bridge arm reactance.
4. The direct current distribution power system simulation method according to claim 3, wherein the voltage limiting buffer absorption model branch specifically comprises:
the device comprises an RC buffer absorption branch and a metal oxide piezoresistor voltage limiting branch, wherein the RC buffer absorption branch is connected with the metal oxide piezoresistor voltage limiting branch in parallel.
5. The direct current distribution power system simulation method according to claim 4, wherein the setting of the action timing sequence of the direct current breaker specifically comprises:
when the direct current distribution power system has a short-circuit fault, sending a trigger signal to a mechanical switch of the mechanical switch model branch circuit to switch on or off the mechanical switch;
when a solid-state switch in the solid-state switch model branch is switched off, sending a switching-on signal to the solid-state switch to switch on the solid-state switch;
and when the short-circuit current is transferred to the solid-state switch model branch circuit and the voltage at the two ends of the mechanical switch is lower than a first preset voltage, sending a switching-off signal to the solid-state switch to switch off the solid-state switch.
6. A direct current power distribution system simulation device is characterized by comprising:
the first building module is used for building a topological structure of a direct current power distribution system, and the topological structure comprises: the circuit comprises a line, a power electronic converter, a direct current breaker and a load, wherein the power electronic converter specifically comprises: an MMC converter, wherein the DC breaker comprises: the system comprises a mechanical switch model branch, a solid-state switch model branch and a voltage-limiting buffer absorption model branch, wherein the mechanical switch model branch, the solid-state switch model branch and the voltage-limiting buffer absorption model branch are connected in parallel;
a first determining module, configured to determine simulation parameters of the topology of the dc power distribution system, where the simulation parameters include: the direct current voltage class, the line length, the interelectrode capacitance, the valve side inductance of the MMC converter, the filter capacitance of the MMC converter, the bridge arm reactance of the MMC converter, the line resistance, the line capacitance, the line inductance and the load reactance;
a second determination module for determining simulation parameters of the power electronic converter, the simulation parameters comprising: maximum capacity, alternating voltage, direct voltage, the number of submodules, selectable submodule nominal, submodule capacitor and bridge arm reactance;
the third determining module is used for determining the arcing resistance of the mechanical switch model branch according to an arc voltage-current curve;
the setting module is used for setting the action time sequence of the direct current circuit breaker;
the fourth determining module is used for determining the boundary state and the boundary constraint condition of the direct current power distribution system;
and the simulation module is used for simulating the direct-current power distribution system according to the topological structure of the direct-current power distribution system, the boundary state and the boundary constraint condition.
7. The direct current distribution system simulation device according to claim 6, wherein the first building block is specifically configured to:
constructing a direct current power distribution system topological structure, wherein the topological structure comprises: the system comprises a first alternating current power supply, a first switch, a first alternating current transformer, a first fully-controlled current converter, a first inductor, a first direct current breaker, first one-way current conversion equipment, a second fully-controlled current converter, a sensitive load, an alternating current microgrid, a direct current load, a first direct current transformer, a first one-way direct current transformer, a direct current microgrid, a second direct current breaker, a second inductor, a third fully-controlled current converter, a second alternating current transformer, a second switch and a second alternating current power supply, wherein the first fully-controlled current converter, the second fully-controlled current converter, the third fully-controlled current converter and the first one-way current conversion equipment are specifically as follows: an MMC converter, the first DC breaker and the second DC breaker include: the system comprises a mechanical switch model branch, a solid-state switch model branch and a voltage-limiting buffer absorption model branch, wherein the mechanical switch model branch, the solid-state switch model branch and the voltage-limiting buffer absorption model branch are connected in parallel;
the first ac power source is connected to the first ac transformer through the first switch, the first ac transformer is connected to the first inductor through the first fully-controlled converter, the first inductor is connected to the first unidirectional converter device through the first dc breaker, the first unidirectional converter device is connected to the sensitive load, the second fully-controlled converter is connected to the ac microgrid, the first unidirectional dc transformer is connected to the dc load, the first dc transformer is connected to the dc microgrid, the first unidirectional converter device, the first fully-controlled converter, the first dc transformer and the first unidirectional dc transformer are sequentially connected in series, the first dc breaker is connected to the second dc breaker, and the second dc breaker is connected to the third fully-controlled converter through the second inductor, the third fully-controlled converter is connected with the second alternating current transformer, and the second alternating current transformer is connected with the second alternating current power supply through the second switch.
8. The direct current distribution system simulation device according to claim 7, wherein the second determination module is specifically configured to:
determining simulation parameters of the first fully-controlled converter, the second fully-controlled converter, the third fully-controlled converter and the first unidirectional converter device, wherein the simulation parameters comprise: maximum capacity, alternating voltage, direct voltage, number of submodules, selectable submodule nominal, submodule capacitor and bridge arm reactance.
9. The direct current distribution power system simulation device according to claim 8, wherein the setting module specifically comprises:
the first sending submodule is used for sending a trigger signal to a mechanical switch of the mechanical switch model branch circuit to enable the mechanical switch to be switched on and off after the direct-current power distribution system has a short-circuit fault;
the second sending submodule is used for sending a conducting signal to the solid-state switch after the solid-state switch in the solid-state switch model branch circuit is switched on, so that the solid-state switch is conducted;
and the third sending submodule is used for sending a switching-on/off signal to the solid-state switch after the short-circuit current is transferred to the solid-state switch model branch circuit and the voltage at the two ends of the mechanical switch is lower than the first preset voltage, so that the solid-state switch is switched on and off.
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