CN110048394B - Starting and stopping method, device and equipment of direct current power distribution network based on star topology structure - Google Patents
Starting and stopping method, device and equipment of direct current power distribution network based on star topology structure Download PDFInfo
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- CN110048394B CN110048394B CN201910440394.5A CN201910440394A CN110048394B CN 110048394 B CN110048394 B CN 110048394B CN 201910440394 A CN201910440394 A CN 201910440394A CN 110048394 B CN110048394 B CN 110048394B
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- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
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Abstract
The application discloses a direct current power distribution network starting and stopping method, device and equipment based on a star topology structure, when a starting instruction of a power grid is received, a first port circuit, a second port circuit, a third port circuit and a fourth port circuit are started in sequence, when a normal stopping instruction is received, the power of all current converters is reduced to zero according to a preset slope by adjusting the power of all current converters, all current converters are locked, alternating current circuit breakers and direct current circuit breakers at all ends are disconnected, normal stopping of the whole direct current power distribution network is achieved, when an emergency stopping instruction is received, direct zero setting is carried out by adjusting the power of the current converters, all current converters are locked, the alternating current circuit breakers and the direct current circuit breakers at all ends are disconnected, emergency stopping of the whole direct current power distribution network is achieved, and the operation stability and reliability of the direct current power distribution network of the star topology structure are improved.
Description
Technical Field
The application relates to the technical field of direct-current power distribution networks, in particular to a method, a device and equipment for starting and stopping a direct-current power distribution network based on a star-type topological structure.
Background
With the rapid increase of urban scale and the rapid development of information technology, sensitive loads, important loads and nonlinear loads in a power grid are more and more, and an alternating current power distribution network faces a series of power quality problems of large line loss, tension of power supply corridors, aggravation of phenomena of instantaneous voltage drop, voltage fluctuation, power grid harmonic waves and three-phase imbalance and the like. The direct-current power distribution network has a series of advantages of being capable of being smoothly connected into various distributed power sources on site, flexibly performing bidirectional power flow and control, improving power supply capacity, improving user-side electric energy quality, isolating system faults and the like, and therefore the direct-current power distribution network has important significance and application prospect in research of the direct-current power distribution network system.
The topological structure of the current direct current power distribution network mainly comprises a two-end or multi-end structure, a ring network structure and a radiation type structure, and a star-shaped topological structure belongs to the radiation type structure and is one of the wide and preferred network topological structures. The direct-current power distribution network based on the star topology structure belongs to a centralized control structure and has the advantages of convenience in control and management, easiness in fault diagnosis and isolation, shorter network delay time, lower transmission error and the like. For different direct current distribution network topological structures, the operation modes of the direct current distribution network are different, and the start-up control strategy and the shutdown control strategy of the direct current distribution network are different. However, the start-stop control strategy for the dc power distribution network with the star topology structure is not deeply researched at present, and in a voltage control strategy suitable for a flexible dc power distribution network disclosed in "chinese motor engineering bulletin" in 2016, only the dc power distribution network with the topology structure of two ends, multiple ends and a ring network structure is analyzed for the voltage control strategy, and the dc power distribution network with the star topology structure is not analyzed for the start-stop strategy.
Disclosure of Invention
The application provides a starting and stopping method, a starting and stopping device and starting and stopping equipment of a direct current power distribution network based on a star-shaped topological structure, and the method, the starting and stopping device and the starting and stopping equipment are used for improving the operation stability and reliability of the direct current power distribution network based on the star-shaped topological structure.
In view of this, a first aspect of the present application provides a start-stop method for a dc power distribution network based on a star topology, which is applied to a dc power distribution network system of a star topology formed by a first port circuit, a second port circuit, a third port circuit, and a fourth port circuit, and includes the following steps:
101. when a starting instruction of a power grid is received, the first port circuit, the second port circuit, the third port circuit and the fourth port circuit are started in sequence;
102A, when a normal stop instruction is received, reducing the power of all converters in the first port circuit, the second port circuit, the third port circuit and the fourth port circuit to zero according to a preset slope, locking all the converters, and disconnecting the alternating current circuit breaker and the direct current circuit breaker of each port circuit, so that the direct current power distribution network system is normally stopped;
102B, when an emergency stop instruction is received, setting the power of all the current converters in the first port circuit, the second port circuit, the third port circuit and the fourth port circuit to zero, locking all the current converters, and disconnecting the alternating current circuit breaker and the direct current circuit breaker of each port circuit, so that the direct current power distribution network system is in emergency shutdown.
Preferably, step 101 specifically includes:
1011. configuring the control mode of the converter of the first one-port circuit into a fixed Udc-Q control mode, configuring the control modes of the second converter of the second port circuit and the converter of the third port circuit into a fixed P-Q control mode, and configuring the control mode of the direct current transformer of the fourth port circuit into a fixed direct current low voltage control mode;
1012. closing charging loop switches of the first port circuit, the second port circuit and the third port circuit, carrying out uncontrollable rectification charging on a direct current network through an alternating current system, and after the uncontrollable rectification charging is finished, controlling the first port circuit configured in the fixed Udc-Q control mode to be unlocked and started;
1013. when the direct-current voltage of the first port circuit reaches a preset reference value, sequentially unlocking the second port circuit and the third port circuit in the fixed P-Q control mode, closing main switches of the first port circuit, the second port circuit and the third port circuit, bypassing a charging loop switch, and improving active power of the second port circuit and the third port circuit;
1014. when the active power of the second port circuit and the active power of the third port circuit reach a preset power value, starting the fourth port circuit, and boosting the direct-current voltage at the low-voltage side of the direct-current transformer, so that the direct-current transformer operates in the constant direct-current low-voltage control mode;
1015. closing a main switch of the fourth port circuit, unlocking a grid-connected converter of an energy storage device, a photovoltaic device, a charging device, an alternating current load and a direct current load switch of the fourth port circuit, and operating the grid-connected converter of the energy storage device, the photovoltaic device, the charging device, the alternating current load and the direct current load switch according to a set control mode.
Preferably, step 103A specifically includes:
a1, if a normal stop instruction is received, sending the normal stop instruction to a current converter of each power controllable end of the direct current power distribution network, so that the current converter of each power controllable end reduces the power to zero according to a preset slope;
a2, locking the inverter at each power controllable end;
a3, ac circuit breakers and dc circuit breakers for breaking the respective port circuits.
Preferably, step 103B specifically includes:
b1, if an emergency stop command is received, sending the emergency stop command to the current converter of each power controllable end of the direct current power distribution network, and enabling the current converter of each power controllable end to directly set the power to zero;
b2, locking the inverter at each power controllable end;
b3, ac circuit breaker and dc circuit breaker for breaking each port circuit.
Preferably, the grid-connected converter of the energy storage device is a bidirectional DC-DC converter, and the control mode is a constant power control mode.
Preferably, the grid-connected converter of the photovoltaic device is a unidirectional Boost converter of a power-directed direct-current system, and the control mode is a constant direct-current voltage control mode, so as to realize maximum power tracking of the photovoltaic array.
Preferably, the grid-connected converter of the charging device is a chopper converter of a power-directing battery Boost, and the control mode is a constant-power control mode.
Preferably, the grid-connected converter of the alternating-current load is in a bridge inverter structure, and the control mode is a V-F control mode.
The application in the second aspect further provides a start/stop device for a direct-current power distribution network based on a star topology, which is applied to a direct-current power distribution network system of the star topology formed by a first port circuit, a second port circuit, a third port circuit and a fourth port circuit, and comprises the following modules:
the normal starting module is used for sequentially starting the first port circuit, the second port circuit, the third port circuit and the fourth port circuit when a starting instruction of a power grid is received;
the normal shutdown module is used for reducing the power of all converters in the first port circuit, the second port circuit, the third port circuit and the fourth port circuit to zero according to a preset slope when a normal shutdown instruction is received, locking all the converters, and disconnecting the alternating current circuit breaker and the direct current circuit breaker of each port circuit to enable the direct current power distribution network system to be normally shutdown;
and the emergency shutdown module is used for setting the power of all the current converters in the first port circuit, the second port circuit, the third port circuit and the fourth port circuit to zero when receiving an emergency stop instruction, locking all the current converters, and disconnecting the alternating current circuit breaker and the direct current circuit breaker of each port circuit so as to emergently shut down the direct current power distribution network system.
The third aspect of the present application further provides a start-stop device for a dc power distribution network based on a star topology, where the start-stop device includes a processor and a memory;
the memory is used for storing program codes and transmitting the program codes to the processor;
the processor is configured to execute the start-stop method for the direct current power distribution network based on the star topology according to the instruction in the program code.
According to the technical scheme, the embodiment of the application has the following advantages:
the application provides a start-stop method for a direct current power distribution network based on a star-shaped topological structure, which is used for the direct current power distribution network system of the star-shaped topological structure consisting of a first port circuit, a second port circuit, a third port circuit and a fourth port circuit, and comprises the following steps: 101. when a starting instruction of a power grid is received, a first port circuit, a second port circuit, a third port circuit and a fourth port circuit are started in sequence; 102A, when a normal stop instruction is received, reducing the power of all converters in the first port circuit, the second port circuit, the third port circuit and the fourth port circuit to zero according to a preset slope, locking all the converters, and disconnecting the alternating current circuit breaker and the direct current circuit breaker of each port circuit to enable the direct current power distribution network system to normally stop operation; 102B, when the emergency stop instruction is received, setting the power of all the current converters in the first port circuit, the second port circuit, the third port circuit and the fourth port circuit to zero, locking all the current converters, and disconnecting the alternating current circuit breaker and the direct current circuit breaker of each port circuit to enable the direct current distribution network system to stop in an emergency mode.
The application provides a start-stop method of a direct current power distribution network based on a star topology structure, when a start instruction of the power network is received, a first port circuit, a second port circuit, a third port circuit and a fourth port circuit are sequentially started, when a normal stop instruction is received, the power of all current converters is adjusted to be reduced to zero according to a preset slope, all current converters are locked, alternating current circuit breakers and direct current circuit breakers at all ends are disconnected, the normal stop of the whole direct current power distribution network is realized, when an emergency stop instruction is received, the power of all current converters is directly set to zero by adjusting the power of the current converters, all current converters are locked, the alternating current circuit breakers and the direct current circuit breakers at all ends are disconnected, the emergency stop of the whole direct current power distribution network is realized, the power is gently stopped in a mode of reducing the power according to the slope when the normal stop is carried out, the power of the current converters is directly set to, the rapid outage under emergency is realized, and the operation stability and reliability of the direct-current power distribution network with the star-shaped topological structure are improved.
Drawings
Fig. 1 is a schematic flowchart of an embodiment of a start-stop method for a dc power distribution network based on a star topology structure according to the present application;
fig. 2 is a schematic flowchart of another embodiment of a start-stop method for a dc power distribution network based on a star topology structure according to the present application;
FIG. 3 is a schematic flow chart of a further embodiment of a start-stop method for a DC power distribution network based on a star topology structure according to the present application
Fig. 4 is a schematic structural diagram of an embodiment of a dc power distribution network start-stop device based on a star topology structure provided in the present application;
fig. 5 is a system architecture diagram of a dc distribution network with a star topology provided in an embodiment of the present application;
fig. 6 is a simulation system structure diagram built on an RTDS simulation platform for the system architecture diagram in fig. 4 provided in this embodiment of the present application.
Detailed Description
In order to make the technical solutions of the present application better understood, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
It should be noted that, the start-stop method for the dc distribution network based on the star topology provided in the embodiment of the present application is applied to the control method for the dc distribution network system based on the star topology composed of the first port circuit T1, the second port circuit T2, the third port circuit T3, and the fourth port circuit T4, and a person skilled in the art can apply the method provided in the embodiment of the present application to the star dc distribution network system based on the same architecture without creating any labor on the basis of the embodiment of the present application, the architecture diagram of the dc distribution network system based on the star topology provided in the embodiment of the present application is shown in fig. 5, the simulation diagram is shown in fig. 6, and the first port circuit T1 includes: a first ac grid1, a first ac bus # 6, a first transformer TM1, a first ac breaker ACCB1 and a first converter MMC-VSC 1; the second port circuit T2 includes: a second ac grid aggregate 2, a second ac bus #7, a second transformer TM2, a second ac breaker ACCB2 and a second converter MMC-VSC 2; the third port circuit T3 includes: a third ac grid aggregate 3, a third ac bus #8, a third transformer TM3, a third ac breaker ACCB3 and a third converter MMC-VSC 3; the fourth port circuit T4 includes: the direct current transformer DCSST, the eighth direct current breaker DCCB8, the ninth direct current breaker DCCB9, the tenth direct current breaker DCCB10, the eleventh direct current breaker DCCB11, the twelfth direct current breaker DCCB12, the first DC/DC converter C1, the second DC/DC converter C2, the third DC/DC converter C3, the AC/DC converter C4, the direct current bus #5, the photovoltaic, the energy storage, the charging device, the direct current load and the alternating current load.
One end of a first direct current breaker DCCB1 is connected with a first alternating current grid ACgrid1 through a first direct current line L1, a first direct current bus # 1, a fourth direct current breaker DCCB4, a first converter MMC-VSC1, a first alternating current breaker ACCB1, a first alternating current bus # 6 and a first transformer TM1 in sequence, and the other end of the first direct current breaker DCCB is connected with a central Node 1; one end of a second direct current breaker DCCB2 is connected with a second alternating current power grid ACgrid2 through a second direct current line L2, a second direct current bus # 2, a fifth direct current breaker DCCB5, a second converter MMC-VSC2, a second alternating current breaker ACCB2, a second alternating current bus #7 and a second transformer TM2 in sequence, and the other end of the second direct current breaker DCCB2 is connected with a central Node 1; one end of a third direct current breaker DCCB3 is connected with a third alternating current power grid ACgrid3 through a third direct current line L3, a third direct current bus #3, a sixth direct current breaker DCCB6, a third converter MMC-VSC3, a third alternating current breaker ACCB3, a third alternating current bus #8 and a third transformer TM3 in sequence, and the other end of the third direct current breaker DCCB3 is connected with a central Node 1; the high-voltage side of the direct current transformer DCSST is sequentially connected with a third direct current line L3 in a T mode through a seventh direct current breaker DCCB7 and a fourth direct current bus # 4, and the low-voltage end of the direct current transformer DCSST is connected with a fifth direct current bus # 5; the photovoltaic is connected with a 5 th direct current bus #5 through a first DC/DC converter C1 and an eighth direct current breaker DCCB8 in sequence; the charging pile is sequentially connected with a 5 th direct current bus #5 through a second DC/DC converter C2 and a ninth direct current breaker DCCB 9; the stored energy is sequentially connected with a 5 th direct current bus #5 through a third DC/DC converter C3 and a tenth direct current breaker DCCB 10; a direct current load is connected with a 5 th direct current bus #5 through an eleventh direct current breaker DCCB 11; the AC load is connected to the 5 th DC bus #5 through the AC/DC converter C4 and the twelfth DC breaker DCCB12 in this order.
For convenience of understanding, please refer to fig. 1, an embodiment of a start-stop method for a dc power distribution network based on a star topology provided in the present application includes the following steps:
It should be noted that, in this embodiment of the application, the control mode of the inverter at each end is set by the system level controller of the dc distribution network, and when a start instruction of the power grid is received, the normal start mode of the dc distribution network is sequentially controlled according to a sequence of first starting the first port circuit T1, then starting the second port circuit T2, then starting the third port circuit T3, and finally starting the fourth port circuit T4, so as to implement stable and sequential start of the entire dc distribution network.
And 102A, when a normal stop instruction is received, reducing the power of all converters in the first port circuit, the second port circuit, the third port circuit and the fourth port circuit to zero according to a preset slope, locking all the converters, and disconnecting the alternating current circuit breaker and the direct current circuit breaker of each port circuit to enable the direct current power distribution network system to stop normally.
It should be noted that, in this embodiment of the present application, when the shutdown instruction received by the system is a normal shutdown instruction, the power of all the current converters in the first port circuit, the second port circuit, the third port circuit, and the fourth port circuit is controlled to be reduced to zero according to a preset slope, then all the current converters are locked, and the ac circuit breaker and the dc circuit breaker of each port circuit are disconnected, so that the whole dc power distribution network can implement stable shutdown.
And 102B, when an emergency stop instruction is received, setting the power of all the current converters in the first port circuit, the second port circuit, the third port circuit and the fourth port circuit to zero, locking all the current converters, and disconnecting the alternating current circuit breakers and the direct current circuit breakers of all the port circuits to enable the direct current power distribution network system to stop in an emergency mode.
It should be noted that, in this embodiment of the application, the shutdown instruction received by the system is an emergency shutdown instruction, which indicates that the system is in a dangerous state and needs emergency shutdown, at this time, the power of all the inverters in the first port circuit T1, the second port circuit T2, the third port circuit T3, and the fourth port circuit T4 is controlled to be directly set to zero, then all the inverters are locked, and the ac circuit breaker and the dc circuit breaker of each port circuit are disconnected, so that the entire dc power distribution network can be rapidly shutdown, and a safety risk caused by untimely shutdown is avoided.
The direct current distribution network starting and stopping method based on the star topology structure provided in the embodiment of the application sequentially starts the first port circuit, the second port circuit, the third port circuit and the fourth port circuit when receiving a starting instruction of a power network, locks all current converters by adjusting the power of all current converters to be reduced to zero according to a preset slope when receiving a normal stopping instruction, disconnects the alternating current circuit breakers and the direct current circuit breakers at all ends to realize normal stopping of the whole direct current distribution network, directly sets the power of the current converters to be zero by adjusting the power of the current converters when receiving an emergency stopping instruction, locks all current converters, disconnects the alternating current circuit breakers and the direct current circuit breakers at all ends to realize emergency stopping of the whole direct current distribution network, adopts a mode of reducing the power according to the slope when in normal stopping, directly sets the power of the current converters to be zero when in emergency stopping, the rapid outage under emergency is realized, and the operation stability and reliability of the direct-current power distribution network with the star-shaped topological structure are improved.
For convenience of understanding, please refer to fig. 2, another embodiment of the start-stop method for a dc power distribution network based on a star topology provided in the present application includes the following steps:
It should be noted that, in this embodiment of the application, when the direct-current distribution network based on the star topology is in operation, the first converter MMC-VSC1 of the first port circuit T1 adopts a constant direct-current voltage and reactive power control mode, that is, a constant Udc-Q control mode is adopted, the second converter MMC-VSC2 of the second port circuit T2 adopts a constant active power and reactive power control mode, that is, a constant P-Q control mode is adopted, the third converter MMC-VSC3 of the third port circuit T3 adopts a constant active power and reactive power control mode, that is, a constant P-Q control mode is adopted, and the fourth port circuit T4 direct-current transformer adopts a constant low-voltage direct-current voltage control mode.
It should be noted that, in the embodiment of the present application, after the control mode of each circuit is configured, first, the charging loop switches, i.e., the auxiliary switches, of the first port circuit T1, the second port circuit T2, and the third port circuit T3 need to be closed, the ac system performs uncontrollable rectification charging to the first converter MMC-VSC1, the second converter MMC-VSC2, and the third converter MMC-VSC3, and the voltage of the dc power distribution network is raised.
And 203, after the direct-current voltage of the first port circuit reaches a preset reference value, sequentially unlocking the second port circuit and the third port circuit in the P-Q control mode, closing main switches of the first port circuit, the second port circuit and the third port circuit, bypassing a charging loop switch, and improving the active power of the second port circuit and the third port circuit.
It should be noted that, in the process of raising the voltage of the dc distribution network in step 202, after the voltage is raised to 0.7Pu at a certain time (13s), the controller valve at the end of the first port circuit T1 is unlocked, the first port circuit T1 carries the second port circuit T2 and the third port circuit T3 to raise the dc voltage 1Pu, closing the main switch of the first port circuit T1, unlocking the second converter MMC-VSC2 and the third converter MMC-VSC3 of the second port circuit T2 and the third port circuit T3, then, the main switches of the second port circuit T2 and the third port circuit T3 are turned on, the system enters an idle running stage, the second port circuit T2 starts to boost the power to 0.4Pu according to a predetermined slope, the third port circuit T3 boosts the power to 0.2Pu, and the first port circuit T1, the second port circuit T2 and the third port circuit T3 operate stably.
And 204, after the active power of the second port circuit and the active power of the third port circuit reach a preset power value, starting the fourth port circuit, and increasing the direct-current voltage at the low-voltage side of the direct-current transformer so that the direct-current transformer operates in a fixed direct-current low-voltage control mode.
And 205, closing a main switch of the fourth port circuit, unlocking a grid-connected converter of the energy storage device, the photovoltaic device, the charging device, the alternating current load and the direct current load switch of the fourth port circuit, and operating the grid-connected converter of the energy storage device, the photovoltaic device, the charging device, the alternating current load and the direct current load switch according to a set control mode.
It should be noted that, after the dc voltage is established at the end of the first port circuit T1, the high-side switch is closed at the end of the fourth port circuit T4, the high-side capacitor of the dc transformer is charged through the charging resistor to establish the dc voltage, the dc transformer controller unlocks the high-side/low-side commutation of the dc transformer, the low voltage of the dc transformer is charged according to the slope, and the voltage of the dc transformer is charged to 1 Pu. After charging is finished, a low-voltage side switch is switched on, the direct-current low-voltage side bus is +/-0.375 kV, then the energy storage controller unlocks a grid-connected converter of the low-voltage side switch, and the energy storage can increase the power injected into the direct-current low-voltage bus to 1MW according to the slope. And meanwhile, the photovoltaic controller unlocks the grid-connected converter of the photovoltaic controller, and the power injected into the direct current power grid by the photovoltaic array is controlled to reach 0.7MW through a maximum power tracking algorithm. The direct current load is merged into a low-voltage bus of the direct current transformer through the direct current breaker, and the power is 0.5 MW. And the alternating-current load grid-connected controller controls the voltage at the alternating-current side of the three-phase bridge inverter to increase an effective value according to a slope, and 0.5MW active power is absorbed from the direct-current power grid. And finally, unlocking the grid-connected inverter by the charging pile controller, and increasing the charging power to 1MW according to the slope. Therefore, the whole direct current power distribution network completes the starting and power boosting processes, and the whole star-shaped direct current power distribution network enters a stable running state.
And step 206A, when a normal stop instruction is received, reducing the power of all the current converters in the first port circuit, the second port circuit, the third port circuit and the fourth port circuit to zero according to a preset slope, locking all the current converters, and disconnecting the alternating current circuit breakers and the direct current circuit breakers of all the port circuits, so that the direct current power distribution network system is normally stopped.
It should be noted that, in the embodiment of the present application, the step 206A is identical to the step 102A in the first embodiment, and is not described herein again.
And step 206B, when the emergency stop instruction is received, setting the power of all the current converters in the first port circuit, the second port circuit, the third port circuit and the fourth port circuit to zero, locking all the current converters, and disconnecting the alternating current circuit breaker and the direct current circuit breaker of each port circuit to enable the direct current distribution network system to stop running emergently.
It should be noted that, in the embodiment of the present application, the step 206B is identical to the step 102B in the first embodiment, and is not described herein again.
For convenience of understanding, please refer to fig. 3, a third embodiment of a start-stop method for a dc power distribution network based on a star topology provided in the present application includes:
It should be noted that step 301 in the present embodiment is the same as step 201 in the second embodiment, and is not described herein again.
It should be noted that step 302 in this embodiment of the application is the same as step 202 in the second embodiment, and is not described herein again.
It should be noted that step 303 in the present embodiment is the same as step 203 in the second embodiment, and is not described herein again.
And step 304, after the active power of the second port circuit and the active power of the third port circuit reach a preset power value, starting the fourth port circuit, and increasing the direct-current voltage at the low-voltage side of the direct-current transformer so that the direct-current transformer operates in a fixed direct-current low-voltage control mode.
It should be noted that step 304 in the present embodiment is identical to step 204 in the second embodiment, and detailed description thereof is omitted here.
And 305, closing a main switch of the fourth port circuit, unlocking a grid-connected converter of the energy storage device, the photovoltaic device, the charging device, the alternating current load and the direct current load switch of the fourth port circuit, and operating the grid-connected converter of the energy storage device, the photovoltaic device, the charging device, the alternating current load and the direct current load switch according to a set control mode.
It should be noted that step 305 in the present embodiment is the same as step 205 in the second embodiment, and is not described herein again.
It should be noted that, in this embodiment of the application, after receiving the normal stop instruction, the normal stop instruction is sent to the converters at each power controllable end of the dc power distribution network, and the converters at each power controllable end down-regulate their power according to the normal stop instruction information and according to a preset slope until the power is 0.
In the embodiment of the present application, after the power of each inverter is reduced to 0, the inverter at each power controllable terminal needs to be locked, that is, the inverter at the first port circuit T1, the inverter at the second port circuit T2, the inverter at the third port circuit T3, the energy storage device, the ac load, the charging device, and the dc transformer are locked.
And 308A, disconnecting the alternating current circuit breaker and the direct current circuit breaker of each port circuit.
In the embodiment of the present application, after the inverter at each controllable terminal is locked, the ac circuit breaker and the dc circuit breaker of each port circuit are disconnected, so that the normal shutdown operation of the dc power distribution network is completed.
It should be noted that, in this embodiment of the present application, after receiving the emergency stop instruction, the emergency stop instruction is sent to the converters at each power controllable end of the dc power distribution network, and the converters at each power controllable end directly set their own power to zero according to the information of the emergency stop instruction.
In the embodiment of the present application, after the power of each inverter is directly reduced to 0, the inverter at each power controllable terminal needs to be locked, that is, the inverter at the first port circuit T1, the inverter at the second port circuit T2, the inverter at the third port circuit T3, the energy storage device, the ac load, the charging device, and the dc transformer are locked.
And step 308B, disconnecting the alternating current circuit breaker and the direct current circuit breaker of each port circuit.
In the embodiment of the present application, after the inverter at each controllable terminal is locked, the ac circuit breaker and the dc circuit breaker of each port circuit are disconnected, so that the emergency shutdown operation of the dc power distribution network is completed.
Further, the energy storage grid-connected converter is a bidirectional DC-DC converter, and the control mode is a constant power control mode.
Furthermore, the photovoltaic grid-connected converter is a unidirectional Boost converter of which the power points to a direct-current system, and the control mode is a constant direct-current voltage control mode so as to realize the maximum power tracking of the photovoltaic array.
Furthermore, a grid-connected converter of the charging device is a chopping converter of which the power points to the battery Boost, and the control mode is a constant-power control mode.
Further, the grid-connected converter of the alternating current load is of a bridge type inverter structure, and the control mode is a V-F control mode.
When the star topology-based direct-current power distribution network start-stop method in the embodiment of the application runs in a direct-current power distribution network system, a first converter MMC-VSC1 at a first port circuit T1 end adopts a constant direct-current voltage and reactive power (namely Udc-Q) control mode, a second converter MMC-VSC2 at a second port circuit T2 end adopts a constant active power and reactive power (namely P-Q) control mode, a third converter MMC-VSC3 of a third port circuit T3 adopts a constant active power and reactive power (namely P-Q) control mode, and a direct-current transformer at a fourth port circuit T4 end adopts a constant low-voltage direct-current voltage control mode. The grid-connected converter of the energy storage device is a bidirectional DC-DC converter, the control mode is a constant power control mode, the grid-connected converter of the photovoltaic device is a single-phase Boost converter of which the power points to a direct-current system, and the control mode is constant direct-current voltage control so as to realize maximum power tracking of a photovoltaic array; the converter of the AC load incorporated into the DC power grid is a bridge inverter structure, a V-F control mode (a control mode for ensuring that the output voltage is in direct proportion to the frequency) is adopted, the grid-connected converter of the charging device is a chopper converter of a power-directing battery Boost, and the control mode is a constant-power control mode; the dc load may be incorporated directly into the low side of the dc transformer.
In this embodiment, after the first port circuit T1 establishes the dc voltage, the fourth port circuit closes the high-side switch, charges the high-side capacitor of the dc transformer through the charging resistor, establishes the dc voltage, unlocks the dc transformer high-side/low-side converter by the dc transformer controller, charges the dc transformer low voltage according to the slope, and pushes the dc transformer voltage to 1 Pu. After charging is finished, the low-voltage side switch is connected, the direct-current low-voltage side bus is +/-0.375 kV, then the energy storage controller unlocks the grid-connected converter, and the energy storage increases the power injected into the direct-current low-voltage bus to 1MW according to the slope. And meanwhile, the photovoltaic controller unlocks the grid-connected converter of the photovoltaic controller, and the power injected into the direct current power grid by the photovoltaic array is controlled to reach 0.7MW through a maximum power tracking algorithm. The direct current load is merged into a low-voltage bus of the direct current transformer through the direct current breaker, and the power is 0.5 MW. And the alternating-current load grid-connected controller controls the voltage at the alternating-current side of the three-phase bridge inverter to increase an effective value according to a slope, and 0.5MW active power is absorbed from the direct-current power grid. And finally, unlocking the grid-connected inverter by the charging pile controller, and increasing the charging power to 1MW according to the slope, so that the whole direct-current power distribution network finishes the starting and power increasing process, and the whole star-shaped direct-current power distribution network enters a stable running state.
To sum up, the start-stop method for the direct-current power distribution network based on the star-shaped topological structure provided in the embodiment of the application has the following advantages and beneficial effects:
(1) the starting control of the direct-current power distribution network based on the star topology structure is realized, the whole process starting control from uncontrollable rectification charging to direct-current voltage slope lifting and then to power slope transmission is completed through the cooperative matching of the port converters of the direct-current power distribution network, and the smooth grid connection of energy storage, photovoltaic, alternating-current load, direct-current load and a charging device is realized through the orderly matching of the direct-current transformer elements.
(2) According to the normal shutdown control method of the method provided by the embodiment of the application, the power of the power controllable end is reduced to 0 according to the slope, the converter is locked, the grid-connected switch is cut off, the smooth shutdown of the direct-current power distribution network is realized, the power fluctuation of the converter is small, and the system is more stable.
(3) The emergency shutdown control method provided by the embodiment of the application is characterized in that the power of the power controllable end is directly and quickly set to zero, the current converter is locked, the grid-connected switch is cut off, the quick emergency shutdown of the direct-current power distribution network is realized, and the requirement for emergency shutdown can be met.
(4) The method provided by the embodiment of the application is simple to operate, strong in adaptability and wide in prospect of providing stability and reliability of the direct-current power distribution network.
For convenience of understanding, please refer to fig. 4, an embodiment of the start-stop device for a dc power distribution network based on a star topology structure provided in the present application is applied to a dc power distribution network system of a star topology structure formed by a first port circuit, a second port circuit, a third port circuit, and a fourth port circuit, and includes the following modules:
the normal starting module 301 is configured to start the first port circuit, the second port circuit, the third port circuit, and the fourth port circuit in sequence when receiving a starting instruction of the power grid.
And a normal shutdown module 302, configured to, when a normal shutdown instruction is received, reduce the power of all the current converters in the first port circuit, the second port circuit, the third port circuit, and the fourth port circuit to zero according to a preset slope, lock all the current converters, and disconnect the ac circuit breaker and the dc circuit breaker of each port circuit, so that the dc power distribution network system is normally shutdown.
The emergency shutdown module 303 is configured to set powers of all the inverters in the first port circuit, the second port circuit, the third port circuit, and the fourth port circuit to zero when receiving the emergency stop instruction, lock all the inverters, and disconnect the ac circuit breaker and the dc circuit breaker of each port circuit, so that the dc power distribution network system is in emergency shutdown.
Further, the normal starting module 301 specifically includes:
the mode control subunit 3011 is configured to configure the control mode of the inverter of the first port circuit to a fixed Udc-Q control mode, configure the control modes of the second inverter of the second port circuit and the inverter of the third port circuit to a fixed P-Q control mode, and configure the control mode of the dc transformer of the fourth port circuit to a fixed dc low voltage control mode.
And the first unlocking subunit 3012 is configured to close the charging loop switches of the first port circuit, the second port circuit, and the third port circuit, perform uncontrollable rectification charging on the dc network through the ac system, and after the uncontrollable rectification charging is completed, control the first port circuit configured in the fixed Udc-Q control mode to unlock and start.
And a second unlocking subunit 3013, configured to unlock the second port circuit and the third port circuit in the P-Q control mode in sequence after the dc voltage of the first port circuit reaches a preset reference value, close main switches of the first port circuit, the second port circuit, and the third port circuit, bypass a charging loop switch, and boost active power of the second port circuit and the third port circuit.
And the third unlocking subunit 3014 is configured to start the fourth port circuit to boost the dc voltage at the low-voltage side of the dc transformer after the active powers of the second port circuit and the third port circuit reach the preset power value, so that the dc transformer operates in the fixed dc low-voltage control mode.
And the fourth unlocking subunit 3015 is configured to close the main switch of the fourth port circuit, unlock the grid-connected inverter of the energy storage device, the photovoltaic device, the charging device, the ac load and the dc load switch of the fourth port circuit, and operate the grid-connected inverter of the energy storage device, the photovoltaic device, the charging device, the ac load and the dc load switch in a predetermined control mode.
Further, the normal shutdown module 303 specifically includes:
the first subunit 3031 is configured to, if a normal stop instruction is received, send the normal stop instruction to the converters at the power controllable ends of the dc power distribution network, so that the converters at the power controllable ends reduce the power to zero according to a preset slope.
And a second subunit 3032, configured to latch the inverter of each power controllable terminal.
And a third subunit 3033 for disconnecting the ac circuit breaker and the dc circuit breaker of each port circuit.
Further, the emergency shutdown module 304 specifically includes:
the fourth subunit 3041 is configured to, if the emergency stop instruction is received, send the emergency stop instruction to the converters at the power controllable ends of the dc power distribution network, so that the converters at the power controllable ends directly set the power to zero.
A fifth subunit 3042, configured to latch the inverter of each power controllable terminal.
A sixth subunit 3043 for disconnecting the ac circuit breaker and the dc circuit breaker of each port circuit.
Further, a grid-connected converter of the energy storage device is a bidirectional DC-DC converter, and the control mode is a constant power control mode.
Furthermore, a grid-connected converter of the photovoltaic device is a unidirectional Boost converter of a power-directing direct-current system, and the control mode is a constant direct-current voltage control mode so as to realize maximum power tracking of the photovoltaic array.
Furthermore, a grid-connected converter of the charging device is a chopping converter of which the power points to the battery Boost, and the control mode is a constant-power control mode.
Further, the grid-connected converter of the alternating current load is of a bridge type inverter structure, and the control mode is a V-F control mode.
The application also provides an embodiment of the direct-current power distribution network starting and stopping device based on the star-shaped topological structure, wherein the direct-current power distribution network starting and stopping device based on the star-shaped topological structure comprises a processor and a memory;
the memory is used for storing program codes and transmitting the program codes to the processor;
the processor is configured to execute any one of the aforementioned star topology based dc power distribution network start-stop method embodiments according to an instruction in the program code.
In the several embodiments provided in the present application, it should be understood that the disclosed apparatus and method may be implemented in other ways. For example, the above-described system embodiments are merely illustrative, and for example, the division of the units is only one logical functional division, and other divisions may be realized in practice, for example, a plurality of units or components may be combined or integrated into another device, or some features may be omitted, or not executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection through some interfaces, systems or units, and may be in an electrical, mechanical or other form.
The units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of the embodiment.
In addition, functional units in the embodiments of the present application may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit. The integrated unit can be realized in a form of hardware, and can also be realized in a form of a software functional unit.
The integrated unit, if implemented in the form of a software functional unit and sold or used as a stand-alone product, may be stored in a computer readable storage medium. Based on such understanding, the technical solution of the present application may be substantially implemented or contributed to by the prior art, or all or part of the technical solution may be embodied in a software product, which is stored in a storage medium and includes instructions for causing a computer device (which may be a personal computer, a server, or a network device) to execute all or part of the steps of the method according to the embodiments of the present application. And the aforementioned storage medium includes: a U disk, a removable hard disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk or an optical disk, and other various media capable of storing program codes.
The above embodiments are only used for illustrating the technical solutions of the present application, and not for limiting the same; although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions in the embodiments of the present application.
Claims (9)
1. A start-stop method of a direct current power distribution network based on a star topology structure is applied to a direct current power distribution network system of the star topology structure consisting of a first port circuit, a second port circuit, a third port circuit and a fourth port circuit, and is characterized by comprising the following steps:
101. when a starting instruction of a power grid is received, the first port circuit, the second port circuit, the third port circuit and the fourth port circuit are started in sequence;
102A, when a normal stop instruction is received, reducing the power of all converters in the first port circuit, the second port circuit, the third port circuit and the fourth port circuit to zero according to a preset slope, locking all the converters, and disconnecting the alternating current circuit breaker and the direct current circuit breaker of each port circuit, so that the direct current power distribution network system is normally stopped;
102B, when an emergency stop instruction is received, setting the power of all the current converters in the first port circuit, the second port circuit, the third port circuit and the fourth port circuit to zero, locking all the current converters, and disconnecting the alternating current circuit breaker and the direct current circuit breaker of each port circuit to make the direct current power distribution network system stop in an emergency;
the 101 specifically comprises:
1011. configuring the control mode of the converter of the first one-port circuit into a fixed Udc-Q control mode, configuring the control modes of the second converter of the second port circuit and the converter of the third port circuit into a fixed P-Q control mode, and configuring the control mode of the direct current transformer of the fourth port circuit into a fixed direct current low voltage control mode;
1012. closing charging loop switches of the first port circuit, the second port circuit and the third port circuit, carrying out uncontrollable rectification charging on a direct current network through an alternating current system, and after the uncontrollable rectification charging is finished, controlling the first port circuit configured in the fixed Udc-Q control mode to be unlocked and started;
1013. when the direct-current voltage of the first port circuit reaches a preset reference value, sequentially unlocking the second port circuit and the third port circuit in the fixed P-Q control mode, closing main switches of the first port circuit, the second port circuit and the third port circuit, bypassing a charging loop switch, and improving active power of the second port circuit and the third port circuit;
1014. when the active power of the second port circuit and the active power of the third port circuit reach a preset power value, starting the fourth port circuit, and boosting the direct-current voltage at the low-voltage side of the direct-current transformer so that the direct-current transformer operates in the constant direct-current low-voltage control mode;
1015. closing a main switch of the fourth port circuit, unlocking a grid-connected converter of an energy storage device, a photovoltaic device, a charging device, an alternating current load and a direct current load switch of the fourth port circuit, and operating the grid-connected converter of the energy storage device, the photovoltaic device, the charging device, the alternating current load and the direct current load switch according to a set control mode.
2. The start-stop method for the direct-current power distribution network based on the star topology structure of claim 1, wherein the step 102A specifically comprises:
a1, if a normal stop instruction is received, sending the normal stop instruction to a current converter of each power controllable end of the direct current power distribution network, so that the current converter of each power controllable end reduces the power to zero according to a preset slope;
a2, locking the inverter at each power controllable end;
a3, ac circuit breakers and dc circuit breakers for breaking the respective port circuits.
3. The start-stop method for the direct-current power distribution network based on the star topology structure of claim 1, wherein the step 102B specifically comprises:
b1, if an emergency stop command is received, sending the emergency stop command to the current converter of each power controllable end of the direct current power distribution network, and enabling the current converter of each power controllable end to directly set the power to zero;
b2, locking the inverter at each power controllable end;
b3, ac circuit breaker and dc circuit breaker for breaking each port circuit.
4. The direct-current power distribution network starting and stopping method based on the star topology structure as claimed in claim 1, wherein the grid-connected converter of the energy storage device is a bidirectional DC-DC converter, and the control mode is a constant power control mode.
5. The direct-current power distribution network starting and stopping method based on the star topology structure as claimed in claim 1, wherein the grid-connected converter of the photovoltaic device is a unidirectional Boost converter of a power-directed direct-current system, and the control mode is a constant direct-current voltage control mode so as to realize maximum power tracking of a photovoltaic array.
6. The direct-current power distribution network starting and stopping method based on the star topology structure as claimed in claim 1, wherein the grid-connected converter of the charging device is a power-directed battery Boost chopper converter, and the control mode is a constant-power control mode.
7. The star-topology-based direct-current power distribution network starting and stopping method of claim 1, wherein the grid-connected converter of the alternating-current load is of a bridge inverter structure, and the control mode is a V-F control mode.
8. The utility model provides a direct current distribution network opens and stops device based on star topology, uses in the direct current distribution network system of the star topology that comprises first port circuit, second port circuit, third port circuit and fourth port circuit, its characterized in that includes following module:
the normal starting module is used for sequentially starting the first port circuit, the second port circuit, the third port circuit and the fourth port circuit when a starting instruction of a power grid is received;
the normal shutdown module is used for reducing the power of all converters in the first port circuit, the second port circuit, the third port circuit and the fourth port circuit to zero according to a preset slope when a normal shutdown instruction is received, locking all the converters, and disconnecting the alternating current circuit breaker and the direct current circuit breaker of each port circuit to enable the direct current power distribution network system to be normally shutdown;
the emergency shutdown module is used for setting the power of all converters in the first port circuit, the second port circuit, the third port circuit and the fourth port circuit to zero when receiving an emergency stop instruction, locking all the converters, and disconnecting the alternating current circuit breaker and the direct current circuit breaker of each port circuit to enable the direct current power distribution network system to be in emergency shutdown;
the normal starting module specifically comprises:
the mode control subunit is used for configuring the control mode of the converter of the first port circuit into a fixed Udc-Q control mode, configuring the control modes of the second converter of the second port circuit and the converter of the third port circuit into a fixed P-Q control mode, and configuring the control mode of the direct current transformer of the fourth port circuit into a fixed direct current low voltage control mode;
the first unlocking subunit is used for closing the charging loop switches of the first port circuit, the second port circuit and the third port circuit, carrying out uncontrollable rectification charging on the direct current network through the alternating current system, and controlling the first port circuit configured in the fixed Udc-Q control mode to unlock and start after the uncontrollable rectification charging is finished;
the second unlocking subunit is used for sequentially unlocking the second port circuit and the third port circuit in the P-Q control mode after the direct-current voltage of the first port circuit reaches a preset reference value, closing main switches of the first port circuit, the second port circuit and the third port circuit, bypassing a charging loop switch, and improving the active power of the second port circuit and the third port circuit;
the third unlocking subunit is used for starting the fourth port circuit to boost the direct-current voltage at the low-voltage side of the direct-current transformer after the active power of the second port circuit and the third port circuit reaches a preset power value, so that the direct-current transformer operates in a fixed direct-current low-voltage control mode;
and the fourth unlocking subunit is used for closing the main switch of the fourth port circuit, unlocking the energy storage device, the photovoltaic device, the charging device, the grid-connected converter of the alternating current load and the direct current load switch of the fourth port circuit, and operating the grid-connected converter of the energy storage device, the photovoltaic device, the charging device, the alternating current load and the direct current load switch according to a set control mode.
9. A direct current distribution network starting and stopping device based on a star topology structure is characterized by comprising a processor and a memory;
the memory is used for storing program codes and transmitting the program codes to the processor;
the processor is used for executing the direct current power distribution network start-stop method based on the star topology structure according to any one of claims 1 to 7 according to instructions in the program code.
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| CN110620378A (en) * | 2019-08-23 | 2019-12-27 | 广东电网有限责任公司珠海供电局 | Three-terminal star-shaped interconnected direct-current power distribution network topology system |
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| CN113612380B (en) * | 2021-08-27 | 2023-03-24 | 国网江苏省电力有限公司电力科学研究院 | Start-stop method and device for converter of comprehensive energy station |
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