CN114336953B - Control method of energy router, central controller and energy router - Google Patents

Control method of energy router, central controller and energy router Download PDF

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Publication number
CN114336953B
CN114336953B CN202011062083.9A CN202011062083A CN114336953B CN 114336953 B CN114336953 B CN 114336953B CN 202011062083 A CN202011062083 A CN 202011062083A CN 114336953 B CN114336953 B CN 114336953B
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voltage
power module
voltage side
low
side capacitor
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CN114336953A (en
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陈凯
王传川
李毅
张振兴
马亮
贾乐
陶斐
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China XD Electric Co Ltd
Xian XD High Voltage Apparatus Co Ltd
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China XD Electric Co Ltd
Xian XD High Voltage Apparatus Co Ltd
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    • Y—GENERAL 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
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y—GENERAL 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
    • Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
    • Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
    • Y04S10/00—Systems supporting electrical power generation, transmission or distribution
    • Y04S10/20—Systems supporting electrical power generation, transmission or distribution using protection elements, arrangements or systems

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Abstract

The invention provides a control method of an energy router, a central controller and the energy router, wherein the control method comprises the steps of acquiring the switching states of all switches of the energy router and the communication states of all power modules, and acquiring a starting instruction of starting the energy router when the switching states indicate that all switches of the energy router are in a breaking state and the communication states indicate that all power modules are in a communication interruption state; if the starting instruction is a high-voltage side starting instruction, controlling a switch component in the energy router to finish charging at a high voltage side and then finish charging at a low voltage side; if the starting instruction is a low-voltage side starting instruction, controlling a switch component in the energy router to finish low-voltage side charging and then finish high-voltage side charging; isolating the faulty power module during start-up. When the power module is started, the power module can be started from the high-voltage side or the low-voltage side of the energy router, and the power module with faults is determined and isolated in the starting process, so that normal starting is ensured, and the starting stability and the starting reliability of the energy router are improved.

Description

Control method of energy router, central controller and energy router
Technical Field
The invention relates to the technical field of control, in particular to a control method of an energy router, a central controller and the energy router.
Background
With the development of energy technology, the traditional power system equipment cannot meet the requirement of access of renewable energy power generation devices, energy storage devices and various types of electric energy loads, and currently, an energy router formed based on a power electronic conversion technology is generally utilized to provide various electric interface forms for new energy power generation devices and various types of loads.
The research application of the energy router mainly aims at the modular cascading technology, namely, the module cascading with low voltage and low power is utilized to meet the application requirements of high voltage and high power, and the energy router is widely used in the energy internet as a core device. Therefore, how to ensure the start-up stability and the start-up reliability of the energy router is a problem to be solved.
Disclosure of Invention
In view of this, the embodiment of the invention provides a control method of an energy router, a central controller and the energy router, so as to improve the starting stability and the starting reliability of the energy router.
In order to achieve the above object, the embodiment of the present invention provides the following technical solutions:
the first aspect of the embodiment of the invention discloses a control method of an energy router, which is suitable for a central controller for controlling the energy router, wherein the energy router at least comprises a high-voltage side isolating switch, a high-voltage side starting circuit formed by connecting a first contactor and a first starting resistor in parallel, a low-voltage side starting circuit formed by connecting a second contactor and a second starting resistor in parallel, a low-voltage side circuit breaker and N power modules, N is a positive integer, and the power modules at least comprise a bypass switch, a first high-voltage side capacitor, a second high-voltage side capacitor and a low-voltage side capacitor, and the method comprises the following steps:
acquiring the switching states of all switches of the energy router and the communication states of all power modules;
when the switch state indicates that all switches of the energy router are in a breaking state and the communication state indicates that all power modules are in a communication interruption state, acquiring a starting instruction for starting the energy router, wherein the starting instruction is a high-voltage side starting instruction or a low-voltage side starting instruction;
if the starting instruction is a high-voltage side starting instruction, controlling a high-voltage side isolating switch, a second contactor and a bypass switch, charging a first high-voltage side capacitor, a second high-voltage side capacitor and a low-voltage side capacitor, and isolating fault power modules in all the power modules according to a first voltage of the first high-voltage side capacitor, a second voltage of the second high-voltage side capacitor and a third voltage of the low-voltage side capacitor;
When the first voltage, the second voltage and the third voltage corresponding to the normal power module in all the power modules meet the preset voltage stabilizing condition, closing the first contactor, adjusting the first voltage, the second voltage and the third voltage corresponding to the normal power module to reach the preset rated voltage, and closing the low-voltage side circuit breaker;
if the starting instruction is a low-voltage side starting instruction, controlling a low-voltage side circuit breaker, a first contactor and a bypass switch, charging a low-voltage side capacitor, a first high-voltage side capacitor and a second high-voltage side capacitor, and isolating fault power modules in all the power modules according to a first voltage of the first high-voltage side capacitor, a second voltage of the second high-voltage side capacitor and a third voltage of the low-voltage side capacitor;
when the first voltage, the second voltage and the third voltage corresponding to the normal power module in all the power modules meet the preset voltage stabilizing condition, the second contactor is closed, the first voltage, the second voltage and the third voltage corresponding to the normal power module are adjusted to reach the preset rated voltage, and the high-voltage side isolating switch is closed.
Preferably, if the start command is a high-voltage side start command, controlling a high-voltage side isolation switch, a second contactor and a bypass switch to charge a first high-voltage side capacitor, a second high-voltage side capacitor and a low-voltage side capacitor, and isolating all fault power modules in the power modules according to a first voltage of the first high-voltage side capacitor, a second voltage of the second high-voltage side capacitor and a third voltage of the low-voltage side capacitor, including:
If the starting instruction is a high-voltage side starting instruction, closing a high-voltage side isolating switch and a second contactor, charging a first high-voltage side capacitor and a second high-voltage side capacitor of each power module, and collecting a first voltage of the first high-voltage side capacitor and a second voltage of the second high-voltage side capacitor in real time;
determining a first fault power module and a first normal power module in all the power modules according to all the first voltages and all the second voltages;
if the number of the first fault power modules is smaller than a number threshold, closing a bypass switch of the first fault power module to isolate the first fault power module;
charging a low-voltage side capacitor of the first normal power module by using the first normal power module, and collecting a third voltage of the low-voltage side capacitor of the first normal power module in real time;
determining a second fault power module and a second normal power module in the first normal power module according to the first voltage, the second voltage and the third voltage corresponding to the first normal power module;
if the sum of the numbers of the first fault power module and the second fault power module is smaller than the number threshold, closing a bypass switch of the second fault power module to isolate the second fault power module;
Correspondingly, when the first voltage, the second voltage and the third voltage corresponding to the normal power module in all the power modules meet a preset voltage stabilizing condition, closing the first contactor, adjusting the first voltage, the second voltage and the third voltage corresponding to the normal power module to reach preset rated voltages, and closing the low-voltage side circuit breaker, wherein the method comprises the following steps:
when the first voltage, the second voltage and the third voltage corresponding to the second normal power module accord with preset voltage stabilizing conditions, a first contactor is closed;
and adjusting the first voltage, the second voltage and the third voltage corresponding to the second normal power module to reach preset rated voltage, and closing the low-voltage side circuit breaker.
Preferably, if the start command is a low voltage side start command, controlling a low voltage side breaker, a first contactor and a bypass switch, charging a low voltage side capacitor, a first high voltage side capacitor and a second high voltage side capacitor, and isolating all fault power modules in the power modules according to a first voltage of the first high voltage side capacitor, a second voltage of the second high voltage side capacitor and a third voltage of the low voltage side capacitor, including:
If the starting instruction is a low-voltage side starting instruction, closing a low-voltage side circuit breaker and a first contactor, charging a low-voltage side capacitor of each power module, and collecting a third voltage of the low-voltage side capacitor in real time;
determining a first fault power module and a first normal power module in all the power modules according to the third voltage;
if the number of the first fault power modules is smaller than a number threshold, closing a bypass switch of the first fault power module to isolate the first fault power module;
charging a first high-voltage side capacitor and a second high-voltage side capacitor of the first normal power module by using the first normal power module, and collecting a first voltage of the first high-voltage side capacitor and a second voltage of the second high-voltage side capacitor of the first normal power module in real time;
determining a second fault power module and a second normal power module in the first normal power module according to the first voltage, the second voltage and the third voltage corresponding to the first normal power module;
if the sum of the numbers of the first fault power module and the second fault power module is smaller than the number threshold, closing a bypass switch of the second fault power module to isolate the second fault power module;
Correspondingly, when the first voltage, the second voltage and the third voltage corresponding to the normal power module in all the power modules meet a preset voltage stabilizing condition, closing the second contactor, adjusting the first voltage, the second voltage and the third voltage corresponding to the normal power module to reach preset rated voltages, and closing the high-voltage side isolating switch, including:
when the first voltage, the second voltage and the third voltage corresponding to the second normal power module accord with preset voltage stabilizing conditions, a second contactor is closed;
and adjusting the first voltage, the second voltage and the third voltage corresponding to the second normal power module to reach preset rated voltage, and closing the high-voltage side isolating switch.
Preferably, the method further comprises:
and if the number of the first fault power modules is greater than or equal to the number threshold, or if the sum of the number of the first fault power modules and the number of the second fault power modules is greater than or equal to the number threshold, stopping starting the energy router.
Preferably, after the closing of the low-voltage side circuit breaker or after the closing of the high-voltage side disconnecting switch, the method further comprises:
And if the abnormal state of the energy router is determined according to the switch state and the communication state, controlling the energy router to switch from a starting mode to an operation mode.
The second aspect of the embodiment of the invention discloses a central controller, which is used for controlling an energy router, wherein the energy router at least comprises a high-voltage side isolating switch, a high-voltage side starting circuit formed by connecting a first contactor and a first starting resistor in parallel, a low-voltage side starting circuit formed by connecting a second contactor and a second starting resistor in parallel, a low-voltage side circuit breaker and N power modules, N is a positive integer, and the power modules at least comprise a bypass switch, a first high-voltage side capacitor, a second high-voltage side capacitor and a low-voltage side capacitor, and the central controller comprises:
the first acquisition unit is used for acquiring the switching states of all the switches of the energy router and the communication states of all the power modules;
the second obtaining unit is used for obtaining a starting instruction for starting the energy router when the switch state indicates that all switches of the energy router are in a breaking state and the communication state indicates that all power modules are in a communication interruption state, wherein the starting instruction is a high-voltage side starting instruction or a low-voltage side starting instruction, executing the first processing unit if the starting instruction is the high-voltage side starting instruction, and executing the third processing unit if the starting instruction is the low-voltage side starting instruction;
The first processing unit is used for controlling the high-voltage side isolating switch, the second contactor and the bypass switch, charging the first high-voltage side capacitor, the second high-voltage side capacitor and the low-voltage side capacitor, isolating fault power modules in all the power modules according to the first voltage of the first high-voltage side capacitor, the second voltage of the second high-voltage side capacitor and the third voltage of the low-voltage side capacitor, and executing the second processing unit;
the second processing unit is used for closing the first contactor when the first voltage, the second voltage and the third voltage corresponding to the normal power module in all the power modules meet the preset voltage stabilizing condition, adjusting the first voltage, the second voltage and the third voltage corresponding to the normal power module to reach the preset rated voltage, and closing the low-voltage side circuit breaker;
the third processing unit is used for controlling the low-voltage side circuit breaker, the first contactor and the bypass switch, charging the low-voltage side capacitor, the first high-voltage side capacitor and the second high-voltage side capacitor, isolating fault power modules in all the power modules according to the first voltage of the first high-voltage side capacitor, the second voltage of the second high-voltage side capacitor and the third voltage of the low-voltage side capacitor, and executing the fourth processing unit;
And the fourth processing unit is used for closing the second contactor when the first voltage, the second voltage and the third voltage corresponding to the normal power modules in all the power modules meet the preset voltage stabilizing condition, adjusting the first voltage, the second voltage and the third voltage corresponding to the normal power modules to reach the preset rated voltage, and closing the high-voltage side isolating switch.
Preferably, the first processing unit includes:
the first processing subunit is used for closing a high-voltage side isolating switch and a second contactor if the starting instruction is a high-voltage side starting instruction, charging a first high-voltage side capacitor and a second high-voltage side capacitor of each power module, and collecting a first voltage of the first high-voltage side capacitor and a second voltage of the second high-voltage side capacitor in real time;
a first determining subunit, configured to determine, according to all the first voltages and all the second voltages, a first faulty power module and a first normal power module in all the power modules;
the first isolation subunit is used for closing a bypass switch of the first fault power module to isolate the first fault power module if the number of the first fault power modules is smaller than a number threshold;
The second processing subunit is used for charging the low-voltage side capacitor of the first normal power module by utilizing the first normal power module and collecting the third voltage of the low-voltage side capacitor of the first normal power module in real time;
a second determining subunit, configured to determine a second fault power module and a second normal power module in the first normal power module according to the first voltage, the second voltage, and the third voltage corresponding to the first normal power module;
the second isolation subunit is used for closing a bypass switch of the second fault power module to isolate the second fault power module if the sum of the numbers of the first fault power module and the second fault power module is smaller than the number threshold;
correspondingly, the second processing unit is specifically configured to: when the first voltage, the second voltage and the third voltage corresponding to the second normal power module meet a preset voltage stabilizing condition, a first contactor is closed, the first voltage, the second voltage and the third voltage corresponding to the second normal power module are adjusted to reach preset rated voltages, and a low-voltage side circuit breaker is closed.
Preferably, the third processing unit includes:
the first processing subunit is used for closing a low-voltage side circuit breaker and a first contactor if the starting instruction is a low-voltage side starting instruction, charging a low-voltage side capacitor of each power module and collecting a third voltage of the low-voltage side capacitor in real time;
a first determining subunit, configured to determine, according to the third voltage, a first faulty power module and a first normal power module in all the power modules;
the first isolation subunit is used for closing a bypass switch of the first fault power module to isolate the first fault power module if the number of the first fault power modules is smaller than a number threshold;
the second processing subunit is used for charging the first high-voltage side capacitor and the second high-voltage side capacitor of the first normal power module by utilizing the first normal power module, and collecting the first voltage of the first high-voltage side capacitor and the second voltage of the second high-voltage side capacitor of the first normal power module in real time;
a second determining subunit, configured to determine a second fault power module and a second normal power module in the first normal power module according to the first voltage, the second voltage, and the third voltage corresponding to the first normal power module;
The second isolation subunit is used for closing a bypass switch of the second fault power module to isolate the second fault power module if the sum of the numbers of the first fault power module and the second fault power module is smaller than the number threshold;
correspondingly, the fourth processing unit is specifically configured to: when the first voltage, the second voltage and the third voltage corresponding to the second normal power module meet a preset voltage stabilizing condition, a second contactor is closed, the first voltage, the second voltage and the third voltage corresponding to the second normal power module are adjusted to reach preset rated voltages, and a high-voltage side isolating switch is closed.
Preferably, the central controller further comprises:
and the switching unit is used for controlling the energy router to switch from a starting mode to an operation mode if the energy router is determined to have no abnormal state according to the switching state and the communication state.
A third aspect of an embodiment of the present invention discloses an energy router, which at least includes: the high-voltage side isolating switch is a high-voltage side starting circuit formed by connecting a first contactor and a first starting resistor in parallel, and a low-voltage side starting circuit formed by connecting a second contactor and a second starting resistor in parallel, wherein N power modules at least comprise a bypass switch, a first high-voltage side capacitor, a second high-voltage side capacitor and a low-voltage side capacitor, and N is a positive integer;
The positive port of the first direct current bus and the negative port of the first direct current bus are respectively connected with a first input end and a second input end of the high-voltage side isolating switch, a first output end of the high-voltage side isolating switch is connected with the high-voltage side of a first power module through the high-voltage side starting circuit, and a second output end of the high-voltage side isolating switch is connected with the high-voltage side of an Nth power module;
the high-voltage sides among the N power modules are connected in series, and the low-voltage sides among the N power modules are connected in parallel;
the positive port of the second direct current bus and the negative port of the second direct current bus are respectively connected with the first input end and the second input end of the low-voltage side circuit breaker, the first output end of the low-voltage side circuit breaker is connected with the first end of the low-voltage side of the power module through the low-voltage side starting circuit, and the second output end of the low-voltage side circuit breaker is connected with the second end of the low-voltage side of the power module.
Based on the control method of the energy router, the central controller and the energy router provided by the embodiment of the invention, the switch states of all switches of the energy router and the communication states of all power modules are obtained, when the switch states indicate that all switches of the energy router are in a breaking state, and the communication states indicate that all power modules are in a communication interruption state, a starting instruction for starting the energy router is obtained; if the starting instruction is a high-voltage side starting instruction, controlling a switch component in the energy router to finish charging at a high voltage side and then finish charging at a low voltage side, and isolating a fault power module in the starting process; if the starting instruction is a low-voltage side starting instruction, a switch component in the energy router is controlled to finish low-voltage side charging and then finish high-voltage side charging, and a fault power module is isolated in the starting process. When the energy router is started, starting operation can be performed from the high-voltage side or the low-voltage side of the energy router, and a power module with faults is determined and isolated in the starting process, so that the energy router can be continuously and normally started, and the starting stability and the starting reliability of the energy router are improved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are required to be used in the embodiments or the description of the prior art will be briefly described below, and it is obvious that the drawings in the following description are only embodiments of the present invention, and that other drawings can be obtained according to the provided drawings without inventive effort for a person skilled in the art.
Fig. 1 is a schematic diagram of an architecture of an energy router according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of a connection between a central controller and an energy router according to an embodiment of the present invention;
FIG. 3 is a flowchart of a method for controlling an energy router according to an embodiment of the present invention;
FIG. 4 is a flow chart of a high side start-up and isolation fault power module provided by an embodiment of the present invention;
FIG. 5 is a flow chart of a low side start-up and isolation fault power module provided by an embodiment of the present invention;
fig. 6 is a block diagram of a central controller according to an embodiment of the present invention.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
In the present disclosure, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.
As known from the background art, the research application of the energy router is mainly in the modular cascading technology, and the energy router is usually used as a core device in the energy internet, so how to ensure the starting stability and the starting reliability of the energy router is a problem to be solved.
Therefore, the embodiment of the application provides a control method of an energy router, a central controller and the energy router, when the energy router is started, starting operation can be performed from a high-voltage side or a low-voltage side of the energy router, and a power module with faults is determined and isolated in the starting process, so that the energy router can be continuously and normally started, and the starting stability and the starting reliability of the energy router are improved.
It should be noted that, according to the application scenario, the energy router according to the embodiment of the present invention may also be referred to as a solid-state transformer, a dc transformer, or an electronic power transformer.
See the figure1, an architecture schematic diagram of an energy router provided by an embodiment of the present invention is shown, where the energy router includes: high-voltage side isolation switch (QF in figure 1) H ) By a first contactor (KM in figure 1 H ) With a first starting resistor (R in figure 1 H ) A high-voltage side start-up circuit constituted in parallel, which is constituted by a second contactor (KM in fig. 1 L ) With a second starting resistor (R in FIG. 1 L ) Low-voltage side starting circuit of parallel configuration, low-voltage side breaker (QF in fig. 1) L ) The N stages at least comprise bypass switches (K in FIG. 1 1 -K N ) A first high side capacitor (C in FIG. 1 11 -C N1 ) A second high side capacitor (C in FIG. 1 12 -C N2 ) And a low side capacitor (C in FIG. 1 10 -C N0 ) Is a positive integer, N is a positive integer.
The first direct current bus positive port (+10 kV, by way of example only) and the first direct current bus negative port (-10 kV, by way of example only) are respectively connected with a high-voltage side isolating switch (QF) H ) The first input end and the second input end of the high-voltage side isolating switch are connected, the first output end of the high-voltage side isolating switch is connected with the high-voltage side of the first power module through the high-voltage side starting circuit, and the second output end of the high-voltage side isolating switch is connected with the high-voltage side of the Nth power module.
The high-voltage sides among the N power modules are connected in series, and the low-voltage sides among the N power modules are connected in parallel.
A second direct current bus positive port (+375V, by way of example only) and a second direct current bus negative port (-375V, by way of example only) are respectively associated with the low side circuit breaker QF L The first output end of the low-voltage side circuit breaker is connected with the first end of the low-voltage side of the first power module through the low-voltage side starting circuit, and the second output end of the low-voltage side circuit breaker is connected with the second end of the low-voltage side of the first power module.
It will be appreciated that the power module further comprises 4 switch modules, a high side sub-module in the high side power unit (SM in fig. 1 1H -SM NH ) An intermediate frequency transformer (MFT 1-MFTN in fig. 1) and a low voltage side sub-module (SM in fig. 1) in a low voltage side power cell 1L -SM NL )。
It should be noted that the high-voltage side power unit is composed of a bypass switch, 4 switch modules, a first high-voltage side capacitor, a second high-voltage side capacitor and a high-voltage side submodule, and the low-voltage side power unit is composed of a low-voltage side submodule and a low-voltage side capacitor.
It should be further noted that the types of the high-voltage side sub-module and the low-voltage side sub-module may be any one of a half-bridge sub-module, a full-bridge sub-module and a clamping double sub-module, and the types of the high-voltage side sub-module and the low-voltage side sub-module are not particularly limited.
The 4 switch modules are the first switch module (Q in FIG. 1 11 -Q N1 ) Second switch module (Q in figure 1) 12 -Q N2 ) Third switch module (Q in FIG. 1) 13 -Q N3 ) And a fourth switch module (Q in FIG. 1) 14 -Q N4 ) Each switch module is integrated by an insulated gate bipolar transistor (Insulated Gate Bipolar Transistor, IGBT) and a diode, and the connection relation of components in each switch module (integrated with the IGBT and the diode) is as follows: the emitter of the IGBT is connected with the anode of the diode, and the collector of the IGBT is connected with the cathode of the diode.
The first output end of the high-voltage side isolating switch is respectively connected with a bypass switch (K) of the first power module through a high-voltage side starting circuit 1 ) A first end of (A) a first switch module (Q) 11 ) Emitter of (c) and second switch module (Q) 12 ) Is connected to the collector of the first power module by-pass switch (K 1 ) And a third switch module (Q) 13 ) Emitter connection of (c).
The first output end of the low-voltage side circuit breaker is connected with the low-voltage side capacitor (C 10 ) The second output of the low-side circuit breaker is connected to the low-side capacitor (C 10 ) Is connected to the second end of the first connector.
Taking the first power module as an example, the connection relation of the internal components of each power module is explained, namely, in the first power module, a first switch module (Q 11 ) Is set of (1)The electrodes are respectively connected with the first high-voltage side capacitor (C 11 ) Positive and high-side submodules (SM 1H ) The emitter of the first switch module is connected with the bypass switch (K 1 ) And a second switch module (Q) 12 ) Is connected to the collector of the capacitor.
Emitter of the second switch module and the third switch module (Q 13 ) The emitter of the third switch module is connected with the bypass switch (K 1 ) And a fourth switch module (Q) 14 ) The emitter of the fourth switch module is connected with the second high-side capacitor (C 12 ) Is connected to the third terminal of the high-side sub-module.
The second end of the high-voltage side sub-module is respectively connected with the emitter of the second switch module, the cathode of the first high-voltage side capacitor and the anode of the second high-voltage side capacitor.
The fourth terminal of the high-side sub-module is connected to the first terminal of an intermediate frequency transformer (MFT 1), the second terminal of which is connected to the low-side sub-module (SM 1L ) Is connected to the first end of the low-side sub-module, and the second end of the low-side sub-module is connected to a low-side capacitor (C 10 ) And are connected in parallel.
It can be understood that the connection diagram of the internal components of the other power modules can refer to the content of the first power module, and the connection relation between the power modules is that the high-voltage sides are connected in series and the low-voltage sides are connected in parallel.
In the embodiment of the present invention, the state of each component in the energy router is controlled by the central controller, and in order to better explain the connection relationship between the central controller and the component of the energy router, the description is given by referring to fig. 2 in conjunction with the content of fig. 1, and fig. 2 is only used for illustration.
Referring to fig. 2, a schematic diagram of connection between a central controller and an energy router according to an embodiment of the present invention is shown.
The central controller is respectively connected with the first contactor (KM) H ) High-voltage side isolation switch (QF) H ) Each power module (including bypass switch), a second contactor (KM L ) And low-voltage side breaker (QF) L ) Connected withAnd (5) connecting. Wherein the thick unbended solid lines represent cable monitoring and the thin unbended solid lines represent fiber optic communications.
It can be understood that the power modules have their own controllers, and the power modules are controlled by the power module's own controller, and the controller of each power module is divided into a high-voltage side control unit and a low-voltage side control unit.
The power supply mode of the high-voltage side control unit and the low-voltage side control unit in each power module is self-powered, namely the high-voltage side control unit acquires voltage through the first high-voltage side capacitor and the second high-voltage side capacitor to ensure normal operation of the high-voltage side control unit, and the low-voltage side control unit acquires voltage through the low-voltage side capacitor to ensure normal operation of the high-voltage side control unit.
The power supply mode of other switches and components supplies power for an external power supply.
It should be noted that the above power supply modes of the components are also merely examples, and the specific power supply modes may be set according to actual situations.
Referring to fig. 3, a flowchart of a control method of an energy router according to an embodiment of the present invention is shown, where the control method is applicable to a central controller for controlling the energy router, and a specific architecture of the energy router is shown in fig. 1, and the control method includes:
step S301: the switching states of all the switches of the energy router and the communication states of all the power modules are obtained.
After the central controller is started, the central controller performs state self-checking on the central controller, and after the state self-checking has no fault, the central controller performs relevant control on the energy router.
In the specific implementation process of step S301, the switch states of all the switches of the energy router are acquired, where the switch states may indicate whether the switches are in a closed state or an open state.
As is apparent from the above description of fig. 2, the power modules are controlled by the controller (the high-voltage side control unit and the low-voltage side control unit) of each power module, so that the communication states of the high-voltage side control unit and the low-voltage side control unit of each power module are obtained, the communication states of the high-voltage side control unit may indicate whether the high-voltage side control unit is in the communication interrupt state, and the communication states of the low-voltage side control unit may indicate whether the low-voltage side control unit is in the communication interrupt state.
Step S302: when the switch state indicates that all switches of the energy router are in a breaking state and the communication state indicates that all power modules are in a communication interruption state, a starting instruction for starting the energy router is obtained. If the start command is a high-voltage side start command, step S303 is executed, and if the start command is a low-voltage side start command, step S305 is executed.
It should be noted that, when the energy router is started, all switches of the energy router need to be in a disconnected state, and all the high-voltage side control units and the low-voltage side control units need to be in a communication interruption state (i.e., all the power modules are in a communication interruption state).
If the switch is in a closed state before the energy router is started, the switch in the closed state is disconnected, so that the switch is in a disconnected state.
In the specific implementation process of step S302, when all switches of the energy router are in a breaking state, and all the high-voltage side control units and the low-voltage side control units are in a communication interruption state, a starting instruction for starting the energy router is obtained.
It can be understood that the start command is a high-voltage side start command or a low-voltage side start command, i.e. if the start command is a high-voltage side start command, the energy router is started from the high-voltage side of the energy router, and if the start command is a low-voltage side start command, the energy router is started from the low-voltage side of the energy router.
Step S303: if the starting instruction is a high-voltage side starting instruction, the high-voltage side isolating switch, the second contactor and the bypass switch are controlled to charge the first high-voltage side capacitor, the second high-voltage side capacitor and the low-voltage side capacitor, and fault power modules in all power modules are isolated according to the first voltage of the first high-voltage side capacitor, the second voltage of the second high-voltage side capacitor and the third voltage of the low-voltage side capacitor.
As can be seen from the foregoing description of fig. 2, the high-voltage side control unit in the power module performs self-powered on via the first high-voltage side capacitor and the second high-voltage side capacitor, and the low-voltage side control unit performs self-powered on via the low-voltage side capacitor.
In the specific implementation process of step S303, if the start command is a high-voltage side start command, the high-voltage side start energy router is instructed to be started from the high-voltage side, the high-voltage side isolation switch and the second contactor of the low-voltage side start circuit are closed, the second start resistor of the low-voltage side start circuit is short-circuited, the first high-voltage side capacitor and the second high-voltage side capacitor of each power module are charged through the first resistor of the high-voltage side start circuit, the high-voltage side control unit of each power module is started, and communication is established between the high-voltage side control unit of each power module and the central controller.
It can be appreciated that after the high-side control unit establishes communication with the central controller, the fault power module in each power module is determined by using the first voltage of the first high-side capacitor of each power module and the second voltage of the second high-side capacitor, and fault isolation is performed by closing the bypass switch of the fault power module.
The high-voltage side control unit and the low-voltage side sub-module in the first normal power module (normal power module after fault isolation of all power modules by using the first voltage and the second voltage) are controlled to charge the low-voltage side capacitor, so that the low-voltage side control unit in the first normal power module is started, and the low-voltage side control unit in the first normal power module is communicated with the central controller.
After the low-voltage side control unit in the first normal power module establishes communication with the central controller, the fault power module in each first normal power module is determined by utilizing the first voltage of the first high-voltage side capacitor, the second voltage of the second high-voltage side capacitor and the third voltage of the low-voltage side capacitor of the first normal power module, and fault isolation is performed by closing the bypass switch of the fault power module.
That is, if the start command is a high-voltage side start command, after the high-voltage side control unit is started, fault isolation is performed on all the power modules by using the first voltage and the second voltage (at this time, the normal power module after fault isolation is the first normal power module), and then the low-voltage side control unit in the first normal power module is started.
After the low-voltage side control unit in the first normal power module is started, the first voltage, the second voltage and the second voltage are utilized to perform fault isolation on all the first normal power modules, and fault power modules in all the first normal power modules are isolated.
Step S304: when the first voltage, the second voltage and the third voltage corresponding to the normal power module in all the power modules meet the preset voltage stabilizing condition, the first contactor is closed, the first voltage, the second voltage and the third voltage corresponding to the normal power module are adjusted to reach the preset rated voltage, and the low-voltage side circuit breaker is closed.
In the specific implementation step S304, after fault isolation is performed on all the first normal power modules, when the first voltage, the second voltage and the third voltage of the second normal power module (the normal power module after fault isolation is performed on all the first normal power modules) meet a preset voltage stabilizing condition, which indicates that charging of the high-voltage side of the energy router is completed, the first contactor of the second normal power is closed to short-circuit the first starting resistor of the high-voltage side starting circuit. And regulating the duty ratio of the front-stage IGBT of the high-voltage side control unit of the second normal power module to enable the first voltage, the second voltage and the third voltage corresponding to the second normal power module to reach preset rated voltage, and closing the low-voltage side circuit breaker.
Step S305: if the starting instruction is a low-voltage side starting instruction, the low-voltage side circuit breaker, the first contactor and the bypass switch are controlled to charge the low-voltage side capacitor, the first high-voltage side capacitor and the second high-voltage side capacitor, and fault power modules in all power modules are isolated according to the first voltage of the first high-voltage side capacitor, the second voltage of the second high-voltage side capacitor and the third voltage of the low-voltage side capacitor.
In the specific implementation process of step S305, if the start command is a low-voltage side start command, the low-voltage side start energy router is instructed to start, the first contactor of the low-voltage side circuit breaker and the high-voltage side start circuit is closed, the first start resistor of the high-voltage side start circuit is short-circuited, the low-voltage side capacitor of each power module is charged through the second resistor of the low-voltage side start circuit, and the low-voltage side control unit of each power module is started, so that the low-voltage side control unit of each power module and the central controller establish communication.
It can be understood that after the low-voltage side control unit of each power module establishes communication with the central controller, the fault power module in each power module is determined by using the third voltage of the low-voltage side capacitor of each power module, and fault isolation is performed by closing the bypass switch of the fault power module.
The high-voltage side control unit of the first normal power module is started by controlling the low-voltage side control unit and the high-voltage side submodule in the first normal power module (the normal power module after fault isolation is carried out on all the power modules by utilizing the third voltage) to charge the first high-voltage side capacitor and the second high-voltage side capacitor, so that the high-voltage side control unit of the first normal power module is communicated with the central controller.
After the high-voltage side control unit of the first normal power module establishes communication with the central controller, the fault power module in each first normal power module is determined by utilizing the first voltage of the first high-voltage side capacitor, the second voltage of the second high-voltage side capacitor and the third voltage of the low-voltage side capacitor of the first normal power module, and fault isolation is performed by closing the bypass switch of the fault power module.
That is, if the start command is a low-voltage side start command, after the low-voltage side control unit is started, fault isolation is performed on all the power modules by using the third voltage (at this time, the normal power module after fault isolation is the first normal power module), and then the high-voltage side control unit in the first normal power module is started.
After the high-voltage side control unit in the first normal power module is started, the first voltage, the second voltage and the second voltage are utilized to perform fault isolation on all the first normal power modules, and fault power modules in all the first normal power modules are isolated.
Step S306: when the first voltage, the second voltage and the third voltage corresponding to the normal power module in all the power modules meet the preset voltage stabilizing condition, the second contactor is closed, the first voltage, the second voltage and the third voltage corresponding to the normal power module are adjusted to reach the preset rated voltage, and the high-voltage side isolating switch is closed.
In the specific implementation process of step S306, after fault isolation is performed on all the first normal power modules, when the first voltage, the second voltage and the third voltage of the second normal power module (the normal power module after fault isolation is performed on all the first normal power modules) meet a preset voltage stabilizing condition, which means that charging of the low-voltage side of the energy router is completed, the second contactor of the second normal power is closed to short-circuit the second starting resistor of the low-voltage side starting circuit, the duty ratio of the front-stage IGBT of the high-voltage side control unit of the second normal power module is adjusted, so that the first voltage, the second voltage and the third voltage corresponding to the second normal power module reach a preset rated voltage, and the high-voltage side isolating switch is closed.
In the process of starting the energy router, if the switch position of any one (or more) of the switches is abnormal according to the switch states of all the switches, starting the energy router is stopped, and alarm information is sent to a designated device (such as a front-end display).
The switch position anomaly designation is: for a switch, the switch should be in a disconnected state during activation of the energy router, but the switch is monitored to be in a closed state based on the switch states of all switches.
Preferably, as is apparent from the foregoing, the relevant control of each switch, the high-side control unit, and the low-side control unit is involved in the execution of the above-described step S303 and step S304, or in the execution of the above-described step S305 and step S306. Therefore, after executing the step S304 or the step S306, if it is determined that the energy router has no abnormal state according to the switch state and the communication state, the energy router is controlled to switch from the start mode to the operation mode.
It should be noted that, the energy router has no abnormal state refers to: the switch state is consistent with the control content for controlling each switch, and the communication state is consistent with the control content for controlling each high-voltage side control unit and each low-voltage side control unit.
In the embodiment of the invention, when the energy router is started, the state of each component of the energy router can be controlled to select to start operation from the high-voltage side or the low-voltage side of the energy router, and the power module with faults is determined and isolated in the starting process, so that the energy router can be continuously and normally started, and the starting stability and the starting reliability of the energy router are improved.
The content of the startup energy router when the startup instruction referred to in step S303 of the foregoing embodiment of the present invention is a high-voltage side startup instruction, referring to fig. 4, is shown in a flowchart of starting up and isolating a fault power module at the high-voltage side, which is provided by the embodiment of the present invention, and includes the following steps:
step S401: if the starting instruction is a high-voltage side starting instruction, the high-voltage side isolating switch and the second contactor are closed, the first high-voltage side capacitor and the second high-voltage side capacitor of each power module are charged, and the first voltage of the first high-voltage side capacitor and the second voltage of the second high-voltage side capacitor are collected in real time.
In the specific implementation process of step S401, if the start command is a high-voltage side start command, the high-voltage side isolation switch and the second contactor of the low-voltage side start circuit are closed, and the first high-voltage side capacitor and the second high-voltage side capacitor of each power module are charged through the first start resistor of the high-voltage side start circuit of each power module.
For each power module, when the first voltage of the first high-voltage side capacitor and the second voltage of the second high-voltage side capacitor of the power module rise to a preset percentage specified voltage (for example, rise to 16% to 40% specified voltage), the high-voltage side control unit of the power module starts and establishes communication with the central controller, and the started high-voltage side control unit sends the first voltage and the second voltage to the central controller in real time.
Step S402: and determining a first fault power module and a first normal power module in all the power modules according to all the first voltages and all the second voltages.
In the specific implementation process of step S402, after determining that the communication of all the high-voltage side control units is stable according to the communication states of all the high-voltage side control units, the central controller determines the first fault power module and the first normal power module in all the power modules by using all the first voltages and all the second voltages.
It will be appreciated that under normal conditions (where all power modules are normal), the error between the first voltages of the respective power modules is no greater than a predetermined percentage (e.g., 2%) and the error between the second voltages of the respective power modules is no greater than a predetermined percentage, i.e., the first voltages are substantially the same between the respective power modules and the second voltages are substantially the same between the respective power modules.
Therefore, for a power module, whether the power module fails or not is judged by two judging conditions, and the first judging condition is whether the communication state of the high-voltage side control unit of the power module is normal or not. The second judgment condition is: whether the error between the first voltage of the power module and the first voltage of other power modules is larger than a preset percentage, and whether the error between the second voltage of the power module and the second voltage of other power modules is larger than a preset percentage.
That is, for a power module, if the communication state of the high-voltage side control unit of the power module is abnormal, and/or an error between the first voltage of the power module and the first voltage of other power modules is greater than a preset percentage, and/or an error between the second voltage of the power module and the second voltage of other power modules is greater than a preset percentage, the power module is indicated to be a first failure power module.
In the process of concretely implementing step S402, a first faulty power module and a first normal power module are determined from all the power modules according to all the first voltages and all the second voltages.
Step S403: it is determined whether the number of first failed power modules is less than a number threshold. If the number of the first fault power modules is greater than or equal to the number threshold, step S404 is executed, and if the number of the first fault power modules is less than the number threshold, step S405 is executed.
The redundancy number (number threshold) of a failed power module is preset, namely when the number of the failed power modules in the energy router is smaller than the number threshold, the energy router can continue to start normally. In the process of implementing step S403 specifically, it is determined whether the number of the first fault power modules (the number may be 0) is smaller than the number threshold, if the number of the first fault power modules is smaller than the number threshold, the energy router is continuously started, and if the number of the first fault power modules is greater than or equal to the number threshold, the process of starting the energy router is stopped.
Step S404: the energy router is disabled.
Step S405: and closing a bypass switch of the first fault power module to isolate the first fault power module.
In the specific implementation process of step S405, the number of the first fault power modules is smaller than the number threshold, and the first fault power modules are cut off and exit from the operation of the device, that is, the first fault power modules are isolated by closing the bypass switch of the first fault power modules.
Step S406: and charging the low-voltage side capacitor of the first normal power module by using the first normal power module, and collecting the third voltage of the low-voltage side capacitor of the first normal power module in real time.
In the specific implementation process of step S406, for each first normal power module, the high-voltage side control unit is utilized to convert the voltage to the low-voltage side sub-module, so as to charge the low-voltage side capacitor of the first normal power module.
The specific process for charging the low-voltage side capacitor is as follows: and transmitting a conversion instruction to the high-voltage side control unit, wherein the high-voltage side control unit converts direct current voltage into alternating current voltage by controlling the on and off of the IGBT of the high-voltage side sub-module, converts the voltage grade of the alternating current voltage (the charging voltage grade corresponding to the low-voltage side capacitor) by using the intermediate frequency transformer, and converts the alternating current voltage after converting the voltage grade into direct current voltage by the low-voltage side sub-module, so that the low-voltage side capacitor is charged.
For each first normal power module, when the third voltage of the low-voltage side capacitor of the first normal power module rises to a preset percentage of a specified voltage (for example, to 24% to 40% of the specified voltage), the low-voltage side control unit of the first normal power module starts and establishes communication with the central controller, and the low-voltage side control unit sends the third voltage of the first normal power module to the central controller in real time.
Step S407: and determining a second fault power module and a second normal power module in the first normal power module according to the first voltage, the second voltage and the third voltage corresponding to the first normal power module.
In the specific implementation process of step S407, after determining that the high-voltage side control units and the low-voltage side control units of all the first normal power modules are stable in communication, the central controller determines the second fault power module and the second normal power module in the first normal power modules by using the first voltage, the second voltage and the third voltage corresponding to all the first normal power modules.
It can be understood that, in combination with the content of step S402, for a first normal power module, whether the first normal power module is faulty is determined by two determining conditions, where the first determining condition is whether the communication states of the high-voltage side control unit and the low-voltage side control unit of the first normal power are normal.
The second judgment condition is: whether the error between the first voltage of the first normal power module and the first voltage of the other first normal power modules is larger than a preset percentage, whether the error between the second voltage of the first normal power module and the second voltage of the other first normal power modules is larger than a preset percentage, and whether the error between the third voltage of the first normal power module and the third voltage of the other first normal power modules is larger than a preset percentage.
In the specific implementation process of step S407, the second fault power module and the second normal power module are determined from the first normal power modules according to the first voltage, the second voltage and the third voltage corresponding to all the first normal power modules.
The content of the second fault power module in the first normal power module can be specifically determined by referring to the content of step S402, which is not described herein.
Step S408: and judging whether the sum of the numbers of the first fault power module and the second fault power module is smaller than a number threshold value. If the sum of the numbers of the first fault power module and the second fault power module is smaller than the number threshold, step S409 is executed, and if the sum of the numbers of the first fault power module and the second fault power module is greater than or equal to the number threshold, step S404 is executed.
In the process of implementing step S408, it is determined whether the sum of the numbers of the first fault power modules and the second fault power modules is smaller than a number threshold, that is, whether the total number of power modules that fail in the energy router is smaller than the number threshold.
If the sum of the numbers of the first fault power module and the second fault power module is smaller than the number threshold, the energy router can be continuously started, the bypass switch of the second fault power module is closed, and the second fault power module is isolated, wherein the bypass switch of the first fault power module is closed, namely the first fault power module is isolated.
If the sum of the numbers of the first fault power module and the second fault power module is larger than or equal to a number threshold, indicating that the energy router cannot be started continuously, and stopping the process of starting the energy router.
Step S409: and closing a bypass switch of the second fault power module to isolate the second fault power module.
Preferably, after executing step S409, the specific implementation content of step S304 in the embodiment of the present invention described above is: when the first voltage, the second voltage and the third voltage corresponding to the second normal power module meet preset voltage stabilizing conditions, the high-voltage side charging is indicated to be completed, and the first contactor is closed to enable the first starting resistor to be short-circuited. The process of adjusting the first voltage, the second voltage and the third voltage of the second normal power module to reach the preset rated voltage, and closing the low-voltage side circuit breaker is described in detail, referring to the above-mentioned embodiment of the present invention, in step S304 of fig. 3.
In the embodiment of the invention, if the starting instruction is a high-voltage side starting instruction, starting from the high-voltage side of the energy router by controlling the states of all components of the energy router, and judging and isolating the power module with multiple faults in the starting process, so that the energy router can continue to start normally, and the starting stability and the starting reliability of the energy router are improved.
The content of the startup energy router when the startup instruction referred to in step S305 of the foregoing embodiment of the present invention is a low-voltage side startup instruction, referring to fig. 5, is shown in a flowchart of low-voltage side startup and fault power module isolation provided by the embodiment of the present invention, and includes the following steps:
step S501: if the starting instruction is a low-voltage side starting instruction, closing the low-voltage side circuit breaker and the first contactor, charging the low-voltage side capacitor of each power module, and collecting the third voltage of the low-voltage side capacitor in real time.
In the specific implementation process of step S501, if the start command is a low-voltage side start command, the first contactors of the low-voltage side circuit breaker and the high-voltage side start circuit are closed, and the low-voltage side capacitor of each power module is charged through the second start resistor of the low-voltage side start circuit of each power module.
For each power module, when the third voltage of the low-voltage side capacitor of the power module rises to a preset percentage specified voltage (for example, to 24% to 40% specified voltage), the low-voltage side control unit of the power module starts and establishes communication with the central controller, and the low-voltage side control unit after starting sends the third voltage to the central controller in real time.
Step S502: and determining a first fault power module and a first normal power module in all the power modules according to the third voltage.
In the specific implementation process of step S502, after determining that the communication of all low-voltage side control units is stable according to the communication states of all low-voltage side control units, the central controller determines the first fault power module and the first normal power module in all power modules by using all third voltages.
It can be understood that, in conjunction with the description of step S402 of fig. 4 in the above embodiment of the present invention, under normal operation, the error between the third voltages of the power modules is not greater than a predetermined percentage, i.e. the third voltages between the power modules are substantially the same.
Therefore, for a power module, whether the power module fails or not is judged by two judging conditions, and the first judging condition is whether the communication state of the low-voltage side control unit of the power module is normal or not. The second determination condition is whether the error between the third voltage of the power module and the third voltages of the other power modules is greater than a preset percentage (e.g., 2%).
That is, for a power module, if the communication state of the high-voltage side control unit of the power module is abnormal, and/or an error between the third voltage of the power module and the third voltage of other power modules is greater than a preset percentage, the power module is indicated to be the first fault power module.
Step S503: and judging whether the number of the first fault power modules is smaller than a number threshold value. If the number of the first fault power modules is greater than or equal to the number threshold, step S504 is executed, and if the number of the first fault power modules is less than the number threshold, step S505 is executed.
In the specific implementation process of step S503, it is determined whether the number of the first fault power modules is smaller than the number threshold, if the number of the first fault power modules is smaller than the number threshold, the energy router is continuously started, and if the number of the first fault power modules is greater than or equal to the number threshold, the process of starting the energy router is stopped.
Step S504: the energy router is disabled.
Step S505: and closing a bypass switch of the first fault power module to isolate the first fault power module.
In the specific implementation process of step S505, the number of the first fault power modules is smaller than the number threshold, and the first fault power modules are cut off and exit from the operation of the device, that is, the first fault power modules are isolated by closing the bypass switch of the first fault power modules.
Step S506: and charging the first high-voltage side capacitor and the second high-voltage side capacitor of the first normal power module by using the first normal power module, and collecting the first voltage of the first high-voltage side capacitor and the second voltage of the second high-voltage side capacitor of the first normal power module in real time.
In the specific implementation process of step S506, for each first normal power module, the low-voltage side control unit is utilized to convert the voltage to the high-voltage side sub-module, so as to charge the first high-voltage side capacitor and the second high-voltage side capacitor of the first normal power module.
The charging process of the first high-voltage side capacitor and the second high-voltage side capacitor comprises the following steps: and the low-voltage side control unit converts direct current voltage into alternating current voltage by controlling the on and off of the IGBT of the low-voltage side sub-module, converts the voltage level of the alternating current voltage (the charging voltage level corresponding to the first high-voltage side capacitor and the second high-voltage side capacitor) by using the intermediate frequency transformer, and converts the alternating current voltage after the voltage level conversion into direct current voltage by the high-voltage side sub-module so as to charge the first high-voltage side capacitor and the second high-voltage side capacitor.
For each first normal power module, when the first voltage of the first high-voltage side capacitor and the second voltage of the second high-voltage side capacitor of the first normal power module rise to a preset percentage of specified voltage (for example, rise to 16% to 40% of specified voltage), the high-voltage side control unit of the first normal power module starts and establishes communication with the central controller, and the high-voltage side control unit sends the first voltage and the second voltage of the first normal power module to the central controller in real time.
Step S507: and determining a second fault power module and a second normal power module in the first normal power module according to the first voltage, the second voltage and the third voltage corresponding to the first normal power module.
In the specific implementation process of step S507, after determining that the high-voltage side control units and the low-voltage side control units of all the first normal power modules are stable in communication, the central controller determines the second fault power module and the second normal power module in the first normal power modules by using the first voltage, the second voltage and the third voltage corresponding to all the first normal power modules.
The process of determining the second fault power module is specifically referred to the content of step S407 in fig. 4 in the above embodiment of the present invention, and will not be described herein.
Step S508: and judging whether the sum of the numbers of the first fault power module and the second fault power module is smaller than a number threshold value. If the sum of the numbers of the first fault power module and the second fault power module is smaller than the number threshold, step S509 is executed, and if the sum of the numbers of the first fault power module and the second fault power module is greater than or equal to the number threshold, step S504 is executed again.
In the specific implementation process of step S508, it is determined whether the sum of the numbers of the first fault power module and the second fault power module is smaller than a number threshold, that is, whether the total number of power modules with faults of the energy router is smaller than the number threshold.
If the sum of the numbers of the first fault power module and the second fault power module is smaller than the number threshold, the energy router can be continuously started, the bypass switch of the second fault power module is closed, and the second fault power module is isolated, wherein the bypass switch of the first fault power module is closed, namely the first fault power module is isolated.
If the sum of the numbers of the first fault power module and the second fault power module is larger than or equal to a number threshold, indicating that the energy router cannot be started continuously, and stopping the process of starting the energy router.
Step S509: and closing a bypass switch of the second fault power module to isolate the second fault power module.
Step S510: the energy router is disabled.
Preferably, after executing step S509, the specific execution procedure of step S306 in fig. 3 of the above embodiment of the present invention is: and when the first voltage, the second voltage and the third voltage corresponding to the second normal power module accord with preset voltage stabilizing conditions, indicating that the charging of the low-voltage side is completed, closing a second contactor to enable the second starting resistor to be short-circuited. And adjusting the first voltage, the second voltage and the third voltage corresponding to the second normal power module to reach preset rated voltage, and closing the high-voltage side isolating switch. In detail, how to adjust the first voltage, the second voltage and the third voltage of the second normal power module to reach the preset rated voltage is described in the above embodiment of the present invention, in step S306 of fig. 3.
In the embodiment of the invention, if the starting instruction is a low-voltage side starting instruction, starting from the low-voltage side of the energy router by controlling the states of all components of the energy router, and judging and isolating the power module with multiple faults in the starting process, so that the energy router can continue to start normally, and the starting stability and the starting reliability of the energy router are improved.
Corresponding to the control method of the energy router provided in the above embodiment of the present invention, referring to fig. 6, the embodiment of the present invention further provides a structural block diagram of a central controller, where the central controller is used to control the energy router, and a specific architecture of the energy router is shown in fig. 1, and the central controller includes: a first acquisition unit 601, a second acquisition unit 602, a first processing unit 603, a second processing unit 604, a third processing unit 605, and a fourth processing unit 606;
the first acquiring unit 601 is configured to acquire a switching state of all switches of the energy router and a communication state of all power modules.
The second obtaining unit 602 is configured to obtain a start instruction for starting the energy router when the switch state indicates that all switches of the energy router are in a breaking state and the communication state indicates that all power modules are in a communication interruption state, where the start instruction is a high-voltage side start instruction or a low-voltage side start instruction, execute the first processing unit 603 if the start instruction is the high-voltage side start instruction, and execute the third processing unit 605 if the start instruction is the low-voltage side start instruction.
The first processing unit 603 is configured to control the high-voltage side isolation switch, the second contactor, and the bypass switch, charge the first high-voltage side capacitor, the second high-voltage side capacitor, and the low-voltage side capacitor, isolate the faulty power modules among all the power modules according to the first voltage of the first high-voltage side capacitor, the second voltage of the second high-voltage side capacitor, and the third voltage of the low-voltage side capacitor, and execute the second processing unit 604.
And the second processing unit 604 is configured to close the first contactor when the first voltage, the second voltage, and the third voltage corresponding to the normal power module in all the power modules meet a preset voltage stabilizing condition, adjust the first voltage, the second voltage, and the third voltage corresponding to the normal power module to reach a preset rated voltage, and close the low-voltage side circuit breaker.
The third processing unit 605 is configured to control the low-voltage side circuit breaker, the first contactor, and the bypass switch, charge the low-voltage side capacitor, the first high-voltage side capacitor, and the second high-voltage side capacitor, isolate the faulty power module among all the power modules according to the first voltage of the first high-voltage side capacitor, the second voltage of the second high-voltage side capacitor, and the third voltage of the low-voltage side capacitor, and execute the fourth processing unit 606.
The fourth processing unit 606 is configured to close the second contactor when the first voltage, the second voltage, and the third voltage corresponding to the normal power module in all the power modules meet a preset voltage stabilizing condition, adjust the first voltage, the second voltage, and the third voltage corresponding to the normal power module to reach a preset rated voltage, and close the high-voltage side isolation switch.
In the embodiment of the invention, when the energy router is started, the state of each component of the energy router can be controlled to select to start operation from the high-voltage side or the low-voltage side of the energy router, and the power module with faults is determined and isolated in the starting process, so that the energy router can be continuously and normally started, and the starting stability and the starting reliability of the energy router are improved.
Preferably, in combination with the content shown in fig. 6, the first processing unit 603 includes: the execution principle of the first processing subunit, the first determining subunit, the first isolation subunit, the second processing subunit, the second determining subunit and the second isolation subunit is as follows:
and the first processing subunit is used for closing the high-voltage side isolating switch and the second contactor if the starting instruction is a high-voltage side starting instruction, charging the first high-voltage side capacitor and the second high-voltage side capacitor of each power module, and collecting the first voltage of the first high-voltage side capacitor and the second voltage of the second high-voltage side capacitor in real time.
And the first determining subunit is used for determining the first fault power module and the first normal power module in all the power modules according to all the first voltages and all the second voltages.
Preferably, the first determining subunit is further configured to: if the number of the first fault power modules is greater than or equal to a number threshold, starting the energy router is stopped.
And the first isolation subunit is used for closing the bypass switch of the first fault power module to isolate the first fault power module if the number of the first fault power modules is smaller than the number threshold value.
The second processing subunit is configured to charge the low-voltage side capacitor of the first normal power module by using the first normal power module, and collect the third voltage of the low-voltage side capacitor of the first normal power module in real time.
The second determining subunit is configured to determine a second fault power module and a second normal power module in the first normal power module according to the first voltage, the second voltage and the third voltage corresponding to the first normal power module.
Preferably, the second determining subunit is further configured to: if the sum of the numbers of the first fault power module and the second fault power module is larger than or equal to a number threshold value, starting the energy router is stopped.
And the second isolation subunit is used for closing a bypass switch of the second fault power module to isolate the second fault power module if the sum of the numbers of the first fault power module and the second fault power module is smaller than the number threshold value.
Correspondingly, the second processing unit 603 is specifically configured to: when the first voltage, the second voltage and the third voltage corresponding to the second normal power module meet the preset voltage stabilizing condition, the first contactor is closed, the first voltage, the second voltage and the third voltage corresponding to the second normal power module are adjusted to reach the preset rated voltage, and the low-voltage side circuit breaker is closed.
In the embodiment of the invention, if the starting instruction is a high-voltage side starting instruction, starting from the high-voltage side of the energy router by controlling the states of all components of the energy router, and judging and isolating the power module with multiple faults in the starting process, so that the energy router can continue to start normally, and the starting stability and the starting reliability of the energy router are improved.
Preferably, in conjunction with the content shown in fig. 6, the third processing unit 605 includes: the execution principle of the first processing subunit, the first determining subunit, the first isolation subunit, the second processing subunit, the second determining subunit and the second isolation subunit is as follows:
And the first processing subunit is used for closing the low-voltage side circuit breaker and the first contactor if the starting instruction is a low-voltage side starting instruction, charging the low-voltage side capacitor of each power module and collecting the third voltage of the low-voltage side capacitor in real time.
And the first determining subunit is used for determining the first fault power module and the first normal power module in all the power modules according to the third voltage.
Preferably, the first determining subunit is further configured to: if the number of the first fault power modules is greater than or equal to a number threshold, starting the energy router is stopped.
And the first isolation subunit is used for closing the bypass switch of the first fault power module to isolate the first fault power module if the number of the first fault power modules is smaller than the number threshold value.
The second processing subunit is configured to charge the first high-voltage side capacitor and the second high-voltage side capacitor of the first normal power module by using the first normal power module, and collect the first voltage of the first high-voltage side capacitor and the second voltage of the second high-voltage side capacitor of the first normal power module in real time.
The second determining subunit is configured to determine a second fault power module and a second normal power module in the first normal power module according to the first voltage, the second voltage and the third voltage corresponding to the first normal power module.
Preferably, the second determining subunit is further configured to: if the sum of the numbers of the first fault power module and the second fault power module is larger than or equal to a number threshold value, starting the energy router is stopped.
And the second isolation subunit is used for closing a bypass switch of the second fault power module to isolate the second fault power module if the sum of the numbers of the first fault power module and the second fault power module is smaller than the number threshold value.
Accordingly, the fourth processing unit 606 is specifically configured to: when the first voltage, the second voltage and the third voltage corresponding to the second normal power module meet preset voltage stabilizing conditions, the second contactor is closed, the first voltage, the second voltage and the third voltage corresponding to the second normal power module are adjusted to reach preset rated voltages, and the high-voltage side isolating switch is closed.
In the embodiment of the invention, if the starting instruction is a low-voltage side starting instruction, starting from the low-voltage side of the energy router by controlling the states of all components of the energy router, and judging and isolating the power module with multiple faults in the starting process, so that the energy router can continue to start normally, and the starting stability and the starting reliability of the energy router are improved.
Preferably, in combination with the content shown in fig. 6, the central controller further includes:
and the switching unit is used for controlling the energy router to switch from the starting mode to the running mode if the energy router is determined to have no abnormal state according to the switching state and the communication state.
In summary, the embodiment of the invention provides a control method of an energy router, a central controller and the energy router, when the energy router is started, the state of each element of the energy router is controlled, the starting operation is selected from the high-voltage side or the low-voltage side of the energy router, the power module with faults is determined and isolated in the starting process, the energy router can be continuously started normally, and the starting stability and the starting reliability of the energy router are improved.
In this specification, each embodiment is described in a progressive manner, and identical and similar parts of each embodiment are all referred to each other, and each embodiment mainly describes differences from other embodiments. In particular, for a system or system embodiment, since it is substantially similar to a method embodiment, the description is relatively simple, with reference to the description of the method embodiment being made in part. The systems and system embodiments described above are merely illustrative, wherein the elements illustrated as separate elements may or may not be physically separate, and the elements shown as elements may or may not be physical elements, may be located in one place, or may be distributed over a plurality of network elements. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of this embodiment. Those of ordinary skill in the art will understand and implement the present invention without undue burden.
Those of skill would further appreciate that the various illustrative elements and algorithm steps described in connection with the embodiments disclosed herein may be implemented as electronic hardware, computer software, or combinations of both, and that the various illustrative elements and steps are described above generally in terms of functionality in order to clearly illustrate the interchangeability of hardware and software. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the solution. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present invention.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims (10)

1. The utility model provides a control method of energy router, characterized by is applicable to the central controller of control energy router, energy router include high-pressure side isolator at least, by first contactor with the parallelly connected high-pressure side starting circuit that constitutes of first starting resistance, by the parallelly connected low-pressure side starting circuit that constitutes of second contactor and second starting resistance, low-pressure side circuit breaker and N power module, N is positive integer, power module includes bypass switch, first high-pressure side electric capacity, second high-pressure side electric capacity and low-pressure side electric capacity at least, the method includes:
acquiring the switching states of all switches of the energy router and the communication states of all power modules;
when the switch state indicates that all switches of the energy router are in a breaking state and the communication state indicates that all power modules are in a communication interruption state, acquiring a starting instruction for starting the energy router, wherein the starting instruction is a high-voltage side starting instruction or a low-voltage side starting instruction;
if the starting instruction is a high-voltage side starting instruction, controlling a high-voltage side isolating switch, a second contactor and a bypass switch, charging a first high-voltage side capacitor, a second high-voltage side capacitor and a low-voltage side capacitor, and isolating fault power modules in all the power modules according to a first voltage of the first high-voltage side capacitor, a second voltage of the second high-voltage side capacitor and a third voltage of the low-voltage side capacitor;
When the first voltage, the second voltage and the third voltage corresponding to the normal power module in all the power modules meet the preset voltage stabilizing condition, closing the first contactor, adjusting the first voltage, the second voltage and the third voltage corresponding to the normal power module to reach the preset rated voltage, and closing the low-voltage side circuit breaker;
if the starting instruction is a low-voltage side starting instruction, controlling a low-voltage side circuit breaker, a first contactor and a bypass switch, charging a low-voltage side capacitor, a first high-voltage side capacitor and a second high-voltage side capacitor, and isolating fault power modules in all the power modules according to a first voltage of the first high-voltage side capacitor, a second voltage of the second high-voltage side capacitor and a third voltage of the low-voltage side capacitor;
when the first voltage, the second voltage and the third voltage corresponding to the normal power module in all the power modules meet the preset voltage stabilizing condition, the second contactor is closed, the first voltage, the second voltage and the third voltage corresponding to the normal power module are adjusted to reach the preset rated voltage, and the high-voltage side isolating switch is closed.
2. The method of claim 1, wherein if the start command is a high side start command, controlling a high side isolation switch, a second contactor, and a bypass switch to charge a first high side capacitor, a second high side capacitor, and a low side capacitor, and isolating all of the power modules from a fault power module according to a first voltage of the first high side capacitor, a second voltage of the second high side capacitor, and a third voltage of the low side capacitor, comprising:
If the starting instruction is a high-voltage side starting instruction, closing a high-voltage side isolating switch and a second contactor, charging a first high-voltage side capacitor and a second high-voltage side capacitor of each power module, and collecting a first voltage of the first high-voltage side capacitor and a second voltage of the second high-voltage side capacitor in real time;
determining a first fault power module and a first normal power module in all the power modules according to all the first voltages and all the second voltages;
if the number of the first fault power modules is smaller than a number threshold, closing a bypass switch of the first fault power module to isolate the first fault power module;
charging a low-voltage side capacitor of the first normal power module by using the first normal power module, and collecting a third voltage of the low-voltage side capacitor of the first normal power module in real time;
determining a second fault power module and a second normal power module in the first normal power module according to the first voltage, the second voltage and the third voltage corresponding to the first normal power module;
if the sum of the numbers of the first fault power module and the second fault power module is smaller than the number threshold, closing a bypass switch of the second fault power module to isolate the second fault power module;
Correspondingly, when the first voltage, the second voltage and the third voltage corresponding to the normal power module in all the power modules meet a preset voltage stabilizing condition, closing the first contactor, adjusting the first voltage, the second voltage and the third voltage corresponding to the normal power module to reach preset rated voltages, and closing the low-voltage side circuit breaker, wherein the method comprises the following steps:
when the first voltage, the second voltage and the third voltage corresponding to the second normal power module accord with preset voltage stabilizing conditions, a first contactor is closed;
and adjusting the first voltage, the second voltage and the third voltage corresponding to the second normal power module to reach preset rated voltage, and closing the low-voltage side circuit breaker.
3. The method of claim 1, wherein if the start command is a low side start command, controlling a low side circuit breaker, a first contactor, and a bypass switch to charge a low side capacitor, a first high side capacitor, and a second high side capacitor, and isolating all of the power modules from a fault power module based on a first voltage of the first high side capacitor, a second voltage of the second high side capacitor, and a third voltage of the low side capacitor, comprising:
If the starting instruction is a low-voltage side starting instruction, closing a low-voltage side circuit breaker and a first contactor, charging a low-voltage side capacitor of each power module, and collecting a third voltage of the low-voltage side capacitor in real time;
determining a first fault power module and a first normal power module in all the power modules according to the third voltage;
if the number of the first fault power modules is smaller than a number threshold, closing a bypass switch of the first fault power module to isolate the first fault power module;
charging a first high-voltage side capacitor and a second high-voltage side capacitor of the first normal power module by using the first normal power module, and collecting a first voltage of the first high-voltage side capacitor and a second voltage of the second high-voltage side capacitor of the first normal power module in real time;
determining a second fault power module and a second normal power module in the first normal power module according to the first voltage, the second voltage and the third voltage corresponding to the first normal power module;
if the sum of the numbers of the first fault power module and the second fault power module is smaller than the number threshold, closing a bypass switch of the second fault power module to isolate the second fault power module;
Correspondingly, when the first voltage, the second voltage and the third voltage corresponding to the normal power module in all the power modules meet a preset voltage stabilizing condition, closing the second contactor, adjusting the first voltage, the second voltage and the third voltage corresponding to the normal power module to reach preset rated voltages, and closing the high-voltage side isolating switch, including:
when the first voltage, the second voltage and the third voltage corresponding to the second normal power module accord with preset voltage stabilizing conditions, a second contactor is closed;
and adjusting the first voltage, the second voltage and the third voltage corresponding to the second normal power module to reach preset rated voltage, and closing the high-voltage side isolating switch.
4. A method according to claim 2 or 3, further comprising:
and if the number of the first fault power modules is greater than or equal to the number threshold, or if the sum of the number of the first fault power modules and the number of the second fault power modules is greater than or equal to the number threshold, stopping starting the energy router.
5. The method of claim 1, further comprising, after the closing of the low side circuit breaker or after the closing of the high side isolation switch:
And if the abnormal state of the energy router is determined according to the switch state and the communication state, controlling the energy router to switch from a starting mode to an operation mode.
6. The utility model provides a central controller, its characterized in that, central controller is used for controlling the energy router, the energy router includes high-pressure side isolator at least, by the parallelly connected high-pressure side starting circuit that constitutes of first contactor and first starting resistor, by the parallelly connected low-pressure side starting circuit that constitutes of second contactor and second starting resistor, low-pressure side circuit breaker and N power module, N is positive integer, power module includes bypass switch, first high-pressure side electric capacity, second high-pressure side electric capacity and low-pressure side electric capacity at least, central controller includes:
the first acquisition unit is used for acquiring the switching states of all the switches of the energy router and the communication states of all the power modules;
the second obtaining unit is used for obtaining a starting instruction for starting the energy router when the switch state indicates that all switches of the energy router are in a breaking state and the communication state indicates that all power modules are in a communication interruption state, wherein the starting instruction is a high-voltage side starting instruction or a low-voltage side starting instruction, executing the first processing unit if the starting instruction is the high-voltage side starting instruction, and executing the third processing unit if the starting instruction is the low-voltage side starting instruction;
The first processing unit is used for controlling the high-voltage side isolating switch, the second contactor and the bypass switch, charging the first high-voltage side capacitor, the second high-voltage side capacitor and the low-voltage side capacitor, isolating fault power modules in all the power modules according to the first voltage of the first high-voltage side capacitor, the second voltage of the second high-voltage side capacitor and the third voltage of the low-voltage side capacitor, and executing the second processing unit;
the second processing unit is used for closing the first contactor when the first voltage, the second voltage and the third voltage corresponding to the normal power module in all the power modules meet the preset voltage stabilizing condition, adjusting the first voltage, the second voltage and the third voltage corresponding to the normal power module to reach the preset rated voltage, and closing the low-voltage side circuit breaker;
the third processing unit is used for controlling the low-voltage side circuit breaker, the first contactor and the bypass switch, charging the low-voltage side capacitor, the first high-voltage side capacitor and the second high-voltage side capacitor, isolating fault power modules in all the power modules according to the first voltage of the first high-voltage side capacitor, the second voltage of the second high-voltage side capacitor and the third voltage of the low-voltage side capacitor, and executing the fourth processing unit;
And the fourth processing unit is used for closing the second contactor when the first voltage, the second voltage and the third voltage corresponding to the normal power modules in all the power modules meet the preset voltage stabilizing condition, adjusting the first voltage, the second voltage and the third voltage corresponding to the normal power modules to reach the preset rated voltage, and closing the high-voltage side isolating switch.
7. The central controller of claim 6, wherein the first processing unit comprises:
the first processing subunit is used for closing a high-voltage side isolating switch and a second contactor if the starting instruction is a high-voltage side starting instruction, charging a first high-voltage side capacitor and a second high-voltage side capacitor of each power module, and collecting a first voltage of the first high-voltage side capacitor and a second voltage of the second high-voltage side capacitor in real time;
a first determining subunit, configured to determine, according to all the first voltages and all the second voltages, a first faulty power module and a first normal power module in all the power modules;
the first isolation subunit is used for closing a bypass switch of the first fault power module to isolate the first fault power module if the number of the first fault power modules is smaller than a number threshold;
The second processing subunit is used for charging the low-voltage side capacitor of the first normal power module by utilizing the first normal power module and collecting the third voltage of the low-voltage side capacitor of the first normal power module in real time;
a second determining subunit, configured to determine a second fault power module and a second normal power module in the first normal power module according to the first voltage, the second voltage, and the third voltage corresponding to the first normal power module;
the second isolation subunit is used for closing a bypass switch of the second fault power module to isolate the second fault power module if the sum of the numbers of the first fault power module and the second fault power module is smaller than the number threshold;
correspondingly, the second processing unit is specifically configured to: when the first voltage, the second voltage and the third voltage corresponding to the second normal power module meet a preset voltage stabilizing condition, a first contactor is closed, the first voltage, the second voltage and the third voltage corresponding to the second normal power module are adjusted to reach preset rated voltages, and a low-voltage side circuit breaker is closed.
8. The central controller of claim 6, wherein the third processing unit comprises:
the first processing subunit is used for closing a low-voltage side circuit breaker and a first contactor if the starting instruction is a low-voltage side starting instruction, charging a low-voltage side capacitor of each power module and collecting a third voltage of the low-voltage side capacitor in real time;
a first determining subunit, configured to determine, according to the third voltage, a first faulty power module and a first normal power module in all the power modules;
the first isolation subunit is used for closing a bypass switch of the first fault power module to isolate the first fault power module if the number of the first fault power modules is smaller than a number threshold;
the second processing subunit is used for charging the first high-voltage side capacitor and the second high-voltage side capacitor of the first normal power module by utilizing the first normal power module, and collecting the first voltage of the first high-voltage side capacitor and the second voltage of the second high-voltage side capacitor of the first normal power module in real time;
a second determining subunit, configured to determine a second fault power module and a second normal power module in the first normal power module according to the first voltage, the second voltage, and the third voltage corresponding to the first normal power module;
The second isolation subunit is used for closing a bypass switch of the second fault power module to isolate the second fault power module if the sum of the numbers of the first fault power module and the second fault power module is smaller than the number threshold;
correspondingly, the fourth processing unit is specifically configured to: when the first voltage, the second voltage and the third voltage corresponding to the second normal power module meet a preset voltage stabilizing condition, a second contactor is closed, the first voltage, the second voltage and the third voltage corresponding to the second normal power module are adjusted to reach preset rated voltages, and a high-voltage side isolating switch is closed.
9. The central controller of claim 6, wherein the central controller further comprises:
and the switching unit is used for controlling the energy router to switch from a starting mode to an operation mode if the energy router is determined to have no abnormal state according to the switching state and the communication state.
10. An energy router, wherein the energy router is connected with a central controller, the energy router at least comprising: the high-voltage side isolating switch is a high-voltage side starting circuit formed by connecting a first contactor and a first starting resistor in parallel, and a low-voltage side starting circuit formed by connecting a second contactor and a second starting resistor in parallel, wherein N power modules at least comprise a bypass switch, a first high-voltage side capacitor, a second high-voltage side capacitor and a low-voltage side capacitor, and N is a positive integer;
The positive port of the first direct current bus and the negative port of the first direct current bus are respectively connected with a first input end and a second input end of the high-voltage side isolating switch, a first output end of the high-voltage side isolating switch is connected with the high-voltage side of a first power module through the high-voltage side starting circuit, and a second output end of the high-voltage side isolating switch is connected with the high-voltage side of an Nth power module;
the high-voltage sides among the N power modules are connected in series, and the low-voltage sides among the N power modules are connected in parallel;
the first output end of the low-voltage side circuit breaker is connected with the first end of the low-voltage side of the first power module through the low-voltage side starting circuit, and the second output end of the low-voltage side circuit breaker is connected with the second end of the low-voltage side of the first power module;
the central controller is used for:
acquiring the switching states of all switches of the energy router and the communication states of all power modules;
when the switch state indicates that all switches of the energy router are in a breaking state and the communication state indicates that all power modules are in a communication interruption state, acquiring a starting instruction for starting the energy router, wherein the starting instruction is a high-voltage side starting instruction or a low-voltage side starting instruction;
If the starting instruction is a high-voltage side starting instruction, controlling a high-voltage side isolating switch, a second contactor and a bypass switch, charging a first high-voltage side capacitor, a second high-voltage side capacitor and a low-voltage side capacitor, and isolating fault power modules in all the power modules according to a first voltage of the first high-voltage side capacitor, a second voltage of the second high-voltage side capacitor and a third voltage of the low-voltage side capacitor;
when the first voltage, the second voltage and the third voltage corresponding to the normal power module in all the power modules meet the preset voltage stabilizing condition, closing the first contactor, adjusting the first voltage, the second voltage and the third voltage corresponding to the normal power module to reach the preset rated voltage, and closing the low-voltage side circuit breaker;
if the starting instruction is a low-voltage side starting instruction, controlling a low-voltage side circuit breaker, a first contactor and a bypass switch, charging a low-voltage side capacitor, a first high-voltage side capacitor and a second high-voltage side capacitor, and isolating fault power modules in all the power modules according to a first voltage of the first high-voltage side capacitor, a second voltage of the second high-voltage side capacitor and a third voltage of the low-voltage side capacitor;
When the first voltage, the second voltage and the third voltage corresponding to the normal power module in all the power modules meet the preset voltage stabilizing condition, the second contactor is closed, the first voltage, the second voltage and the third voltage corresponding to the normal power module are adjusted to reach the preset rated voltage, and the high-voltage side isolating switch is closed.
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