CN110504692B - Unified power flow control system and method for photovoltaic energy storage traction power supply of urban rail transit - Google Patents
Unified power flow control system and method for photovoltaic energy storage traction power supply of urban rail transit Download PDFInfo
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- CN110504692B CN110504692B CN201910793889.6A CN201910793889A CN110504692B CN 110504692 B CN110504692 B CN 110504692B CN 201910793889 A CN201910793889 A CN 201910793889A CN 110504692 B CN110504692 B CN 110504692B
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/04—Circuit arrangements for ac mains or ac distribution networks for connecting networks of the same frequency but supplied from different sources
- H02J3/06—Controlling transfer of power between connected networks; Controlling sharing of load between connected networks
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/28—Arrangements for balancing of the load in a network by storage of energy
- H02J3/32—Arrangements for balancing of the load in a network by storage of energy using batteries with converting means
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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
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/50—Photovoltaic [PV] energy
- Y02E10/56—Power conversion systems, e.g. maximum power point trackers
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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
- Y02E70/00—Other energy conversion or management systems reducing GHG emissions
- Y02E70/30—Systems combining energy storage with energy generation of non-fossil origin
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Abstract
The invention discloses a unified power flow control system and a unified power flow control method for photovoltaic energy storage traction power supply of urban rail transit, which comprise a power non-adjustable device and a power adjustable device in a direct-current traction power supply network of an urban rail transit traction power supply system with photovoltaic energy storage power supply, controllers of power adjustable devices of traction substations participating in primary adjustment, a unified power flow controller participating in secondary adjustment, an economic dispatching plan controller participating in tertiary adjustment, a comprehensive automation subsystem of the traction substations, a central comprehensive monitoring system and a communication network. The local controller is used for adjusting the direct-current bus voltage of the traction substation; the optimal power flow distribution of the direct-current traction network is realized, so that the power loss of the traction network is minimum, the voltage fluctuation of the traction network is minimum, the voltage level of the traction network is improved, and the current of each train is provided by traction substations on two sides as far as possible; and (4) an economic dispatching plan, namely determining a power output plan of the adjustable power device at different time intervals and a pre-charging and discharging plan of the energy storage device, and efficiently utilizing photovoltaic energy storage.
Description
Technical Field
The invention belongs to the technical field of urban rail transit power supply systems, and particularly relates to a unified power flow control system and method for urban rail transit photovoltaic energy storage traction power supply.
Background
The power of all traction substation rectifier units of the existing urban rail direct-current traction power supply system is not adjustable and controllable, the size and the position of current taking of all-line trains are naturally distributed in the whole-line range according to the constraint condition of a circuit, when the train dispatching interval is large, all-line traction substation rectifier units provide power for the current taking trains, the long-distance transmission of the power is caused, extra power loss is brought, the long-distance backflow of the current taking of the trains also causes the path of stray current to be farther and more complex, the problems of high steel rail potential and the like are caused.
In the conventional urban rail direct-current traction power supply system, trains are frequently started and braked, regenerative braking energy brought by braking is distributed to each traction train in a direct-current traction network, and if the regenerative braking energy is still remained, the regenerative braking energy is consumed by braking the trains. The flow of regenerative braking energy in the traction network will cause the voltage of the traction network to rise, and the redundant regenerative energy is consumed through the braking resistor to cause energy waste. In order to fully utilize regenerative braking energy, an urban rail traction substation starts to adopt an inversion feedback device, but the output of the inversion feedback device can be controlled only according to the direct-current side voltage and power of the traction substation, the optimization of the power flow of the whole network cannot be realized, and the energy-saving effect is limited.
The existing urban rail direct current traction power supply system supplies power to both sides of each traction substation, the power distribution of a direct current traction network and the bus voltage of the traction substation cannot be adjusted, and the power distribution and the bus voltage of the traction substation change along with the change of the running distribution and the running state of a train. In actual operation, when the train is regeneratively braked, the regenerative energy is absorbed by the train in a nearby traction state, and when the grid voltage is higher than the regenerative brake resistor starting voltage, the surplus energy is consumed by the regenerative brake resistor. If the traction substation is provided with an inversion feedback device, regenerative braking energy is fed back to the alternating current side. The inverter feedback device controller controls feedback power according to the bus voltage, has certain voltage regulation capacity, but is only limited to a regeneration feedback state.
Disclosure of Invention
In order to solve the problems, the invention provides a unified power flow control system and a unified power flow control method for photovoltaic energy storage traction power supply of urban rail transit, which realize the adjustment of a local controller on the voltage of a direct-current bus of a traction substation; the unified power flow controller performs coordinated control on power distribution and voltage of the whole network, optimal power flow distribution of a direct-current traction network is realized, power loss and voltage fluctuation of the traction network are minimized, the voltage level of the traction network is improved, each train current is taken as far as possible by traction substations on two sides, extra power loss and increase of stray current paths caused by power supply across the stations are avoided, and voltage fluctuation of the traction network and steel rail potential are reduced; and the economic dispatching plan is used for determining the power output plan of the adjustable power device at different time intervals and the pre-charging and discharging plan of the energy storage device, efficiently utilizing the photovoltaic power generation system, avoiding abandoning light, and realizing economic and environment-friendly dispatching by planning to peak clipping, valley filling and stabilizing network pressure.
In order to achieve the purpose, the invention adopts the technical scheme that: a unified power flow control system for urban rail traffic photovoltaic energy storage traction power supply comprises a power non-adjustable device and a power adjustable device in a DC traction power supply network of an urban rail traffic traction power supply system with photovoltaic energy storage power supply, controllers of all traction substation power adjustable devices participating in primary adjustment, a unified power flow controller participating in secondary adjustment, an economic dispatching plan controller participating in tertiary adjustment, a comprehensive automation subsystem of a traction substation, a central comprehensive monitoring system and a communication network; the direct-current traction power supply network is in communication connection with a traction substation comprehensive automation subsystem, and the traction substation comprehensive automation subsystem is connected to a communication network; the communication network transmits signals to each traction substation power adjustable device controller participating in primary adjustment, and each traction substation power adjustable device controller participating in primary adjustment transmits signals to a power non-adjustable device and a power adjustable device in a direct-current traction power supply network; the communication network is also connected with a central integrated monitoring center, the central integrated monitoring center comprises a central integrated monitoring system, a unified power flow controller participating in secondary regulation, and an economic dispatching plan controller participating in tertiary regulation, wherein the unified power flow controller participating in secondary regulation is connected with the economic dispatching plan controller;
the primary adjustment is completed through a local controller of each traction substation power adjustable device, and the voltage fluctuation of the adjustment range at the node is within a normal operation range;
performing secondary regulation, namely acquiring power flow control information on operating parameters of each power non-adjustable device and each power adjustable device of the traction substation through a comprehensive automatic subsystem of each traction substation of an urban rail traffic line, uploading the power flow control information to a unified power flow controller of a central comprehensive monitoring center through a communication network, performing unified power flow distribution management control on each power adjustable device of the traction substation, adjusting a reference value of primary regulation, reducing direct-current voltage deviation and realizing optimal power flow of a direct-current traction network;
and the third adjustment is to perform traction power supply calculation according to a daily train operation plan to obtain a daily load curve, predict a new energy daily generated energy curve according to weather historical data prediction and new energy power generation historical data, optimize load flow calculation, determine power output plans of the adjustable power devices in different time periods, and realize economic and environment-friendly scheduling through adjustment of the unified load flow controller.
Furthermore, the comprehensive automation subsystem of the traction substation comprises an acquisition module and an RTU module, acquires real-time running voltage, power and various state parameters of each traction substation along the line, including a power non-adjustable device and a power adjustable device, and uploads the parameters to the unified power flow control system of the central comprehensive monitoring center through a communication network; the collected power flow control information comprises real-time output power and voltage of a direct current side of a rectifier unit of a full-line traction substation, output power and voltage of a photovoltaic power generation system which is connected with a grid at the direct current traction side, discharge power, charging power, voltage, charge state and the like of an energy storage device, voltage of an inverter device, inversion feedback power and voltage, and rectification output power or inversion feedback power and voltage of a bidirectional inverter unit.
Further, the power non-adjustable device comprises a rectifier unit of each traction substation, and a photovoltaic energy storage power generation system of a vehicle section or a parking lot which is connected to the grid at the direct current traction side of the traction substation; the power adjustable device comprises an energy storage device, an inversion feedback device and a bidirectional inverter set.
Further, the power adjustable device comprises local controllers, primary adjustment is realized through the local controllers of the power adjustable devices of the respective traction substations according to a power-voltage characteristic curve, and voltage fluctuation of a direct-current bus is adjusted to be within a normal operation range;
the local controller of the power adjustable device is an executor of secondary adjustment of the unified power flow controller on the basis of primary adjustment; the target power output by the optimal power flow calculation of the unified power flow controller is downloaded to a local controller of the power adjustable device through a central integrated monitoring center communication network, the target power is used as the reference power of the local controller, the output power of the power adjusting device is adjusted to reach the target value, the unified adjustment of the power adjustable device of the full-line direct current traction network is realized, the targets of minimum loss and minimum voltage fluctuation of the full-line direct current traction network are reached, and finally the full-line unified power flow control management of the direct current traction power supply system is realized.
Further, the unified power flow controller realizes secondary adjustment of the power flow of the direct-current traction network; the integrated automation subsystem of each traction substation uploads real-time running voltage and power of a direct-current side power output device of each traction substation in a whole line to a unified power flow controller through an RTU (remote terminal Unit), the unified power flow controller takes the minimum power loss and the minimum voltage fluctuation of a direct-current traction network as targets, applies an output capacity limit value, a working voltage limit value and an energy storage device charge limit value of each power adjustable device as constraint conditions, formulates an energy distribution strategy, performs optimal power flow calculation, and determines the target power output of each traction substation power adjustable device; the optimal power output of the rectifier unit is realized, the direct current output voltage fluctuation of the full-line traction substation is minimized, the power flow is distributed according to the shortest path, the line voltage loss and the power loss of the full-line direct current traction power supply network are minimized, and the economic and technical indexes are optimal.
Furthermore, the economic dispatching plan controller carries out traction power supply calculation according to a daily train operation plan to obtain a daily load curve, predicts a new energy daily generated energy curve according to weather historical data prediction and new energy power generation historical data, optimizes load flow calculation, determines power output plans of the adjustable power devices in different time periods, pre-charging and discharging plans of the energy storage devices, forcibly inputs the pre-charging and discharging plans into the unified load flow controller for adjustment according to certain planning time, efficiently utilizes the photovoltaic power generation system, avoids light abandoning, plays roles in peak clipping, valley filling and network voltage stabilizing through power control of the all-line adjustable power devices, and realizes economic and environment-friendly dispatching.
On the other hand, the invention also provides a unified power flow control method for the photovoltaic energy storage traction power supply of the urban rail transit, which comprises the following steps:
s100, data acquisition and transmission: the method comprises the steps that collection and collection of real-time data are completed in a traction substation integrated automation subsystem, and power flow control information is transmitted to a unified power flow controller of a central integrated monitoring center through a remote terminal system RTU through a communication network;
s200, unified power flow control in secondary regulation: according to the collected power flow control information, aiming at the minimum power loss and the minimum voltage fluctuation of a direct current traction network in a unified power flow controller, applying constraint conditions of output capacity limit values, working voltage limit values and charge limit values of energy storage devices of all power adjustable devices, formulating an energy distribution strategy, performing optimal power flow calculation, performing unified power flow distribution management control on all the power adjustable devices of the traction substation, determining target power output of all the power adjustable devices of the traction substation, downloading the target power output to a local controller of the power adjustable devices through a communication network, and reducing direct current voltage deviation by taking the target power as a reference value for primary adjustment; the optimal power output of the rectifier unit is realized, the direct current output voltage fluctuation of the full-line traction substation is minimized, the power flow is distributed according to the shortest path, the line voltage loss and the power loss of the full-line direct current traction power supply network are minimized, and the economic and technical indexes are optimal;
s300, adjusting the medium economic dispatching plan for the third time: carrying out traction power supply calculation according to a daily train operation plan to obtain a daily load curve, predicting a new energy daily generated energy curve according to weather historical data prediction and new energy power generation historical data, optimizing load flow calculation, determining a power output plan of the adjustable power device at different time intervals, and a pre-charging and discharging plan of the energy storage device, and forcibly inputting the pre-charging and discharging plans into the unified load flow controller for adjustment according to a certain planning time; the photovoltaic power generation system is efficiently utilized, light abandonment is avoided, the effects of peak clipping, valley filling and net pressure stabilization are achieved through power control of the full-line power adjustable device, and economic and environment-friendly scheduling is achieved;
s400, controlling a power adjustable device in primary adjustment: the method comprises the steps that a local controller realizes primary regulation according to a power-voltage characteristic curve, and the voltage fluctuation of a direct-current bus is adjusted to be within a normal operation range; meanwhile, target power obtained after optimization of the unified power flow controller is used as reference power and is respectively transmitted to each power adjustable device controller, the controllers adjust output to enable the target power to be achieved, secondary adjustment is completed, whole-line power adjustment is finally achieved, the control targets of minimum line loss and minimum voltage fluctuation are completed, if the voltage difference value between two traction substations is zero, the load can be guaranteed to be only supplied with power by the adjacent substations, and the situation that the current path increases through the path due to power supply across the substations, the line loss increases, and the path of stray current increases to bring steel rail potential rise and electric corrosion of surrounding metal pipelines is avoided.
Furthermore, the power flow control information collected in real time comprises AC-DC output voltage and current of a rectifier unit, total radiation illumination intensity Sref of the photovoltaic power generation system, surface temperature Tref, DC-DC output voltage and power, direct-current side voltage and power of an inversion feedback device, direct-current side voltage and power of a bidirectional inverter unit, and DC-DC output voltage, power and charge state of an energy storage device; and uploading real-time operating voltage and power of the direct-current side power output devices of all traction substations to the unified power flow controller through the RTU module according to power flow control information acquired by the comprehensive automation subsystem of each traction substation.
The beneficial effects of the technical scheme are as follows:
the invention is implemented in the existing central comprehensive monitoring center, and the local controllers of all the power adjustable devices arranged in the traction substation complete the primary adjustment of the DC bus voltage, so that the voltage fluctuation is reduced and the DC bus voltage is within the normal operation range. On the basis of the existing functions of a traditional central comprehensive monitoring center, the running parameters of a rectifier unit, an inversion feedback device, a photovoltaic power generation system at a direct current traction side, an energy storage device and a bidirectional inverter unit replacing the rectifier unit and the inversion feedback device of each traction substation are collected through a comprehensive automatic subsystem of each traction substation of an urban rail traffic line, and are uploaded to a unified power flow controller of the central comprehensive monitoring center through an RTU (remote terminal unit) through a communication network, under the condition that the constraint conditions of normal running power, voltage, charge limit value and the like of each energy output device of a full-line traction substation are met, the power output of each power adjustable device in the system is optimized through a unified power flow controller, and is input to a bottom layer controller of each power adjustable device as reference power, the full-line unified power flow control management of a direct current traction power supply system is realized, and the secondary regulation of power and voltage of each node of a direct current traction network is completed. The method comprises the steps of carrying out traction power supply calculation according to a daily train operation plan to obtain a daily load curve, predicting a new energy daily generated energy curve according to weather historical data prediction and new energy power generation historical data, optimizing load flow calculation, determining power output plans of adjustable power devices in different time periods, pre-charging and discharging plans of an energy storage device, and forcibly inputting the pre-charging and discharging plans into a unified load flow controller according to a certain plan time to complete three times of adjustment. The current situations that the power distribution of the existing urban rail direct current traction network and the bus voltage of the traction substation are not adjustable and uncontrollable are changed. The method comprises the steps that through layered adjustment, the adjustment of a local controller on the voltage of a direct-current bus of a traction substation is achieved; the unified power flow controller is used for coordinately controlling the power distribution and the voltage of the whole network, realizing the optimal power flow distribution of the direct-current traction network, minimizing the power loss and the voltage fluctuation of the traction network, improving the voltage level of the traction network, enabling the current of each train to be provided by traction substations on two sides as far as possible, avoiding the extra power loss and the increase of a stray current path caused by power supply across the trains, and reducing the voltage fluctuation and the steel rail potential of the traction network; and the economic dispatching plan is used for determining the power output plan of the adjustable power device at different time intervals and the pre-charging and discharging plan of the energy storage device, efficiently utilizing the photovoltaic power generation system, avoiding abandoning light, and realizing economic and environment-friendly dispatching by planning to peak clipping, valley filling and stabilizing network pressure.
Drawings
FIG. 1 is a schematic structural diagram of a unified power flow control system for the urban rail transit photovoltaic energy storage traction power supply of the invention;
FIG. 2 is a control topological diagram of a structural schematic diagram of a unified power flow control system for the urban rail transit photovoltaic energy storage traction power supply in the embodiment of the invention;
fig. 3 is a schematic flow chart of a unified power flow control method for the photovoltaic energy storage traction power supply of the urban rail transit in the embodiment of the invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described with reference to the accompanying drawings.
In this embodiment, referring to fig. 1 and fig. 2, the present invention provides a unified power flow control system for urban rail transit photovoltaic energy storage tractive power supply, including a power non-adjustable device and a power adjustable device in a dc tractive power supply network of an urban rail transit tractive power supply system with photovoltaic energy storage power supply, power adjustable device controllers of various traction substations participating in primary adjustment, a unified power flow controller participating in secondary adjustment, an economic dispatch plan controller participating in tertiary adjustment, a comprehensive automation subsystem of the traction substations, a central comprehensive monitoring system, and a communication network; the direct-current traction power supply network is in communication connection with a traction substation integrated automation subsystem, and the traction substation integrated automation subsystem is connected to a communication network; the communication network transmits signals to each traction substation power adjustable device controller participating in primary adjustment, and each traction substation power adjustable device controller participating in primary adjustment transmits signals to a power non-adjustable device and a power adjustable device in a direct-current traction power supply network; the communication network is also connected with a central comprehensive monitoring center, the central comprehensive monitoring center comprises a central comprehensive monitoring system, a unified power flow controller participating in secondary regulation, and an economic dispatching plan controller participating in tertiary regulation, wherein the unified power flow controller participating in secondary regulation is connected with the economic dispatching plan controller;
the primary adjustment is completed through a local controller of each traction substation power adjustable device, and the voltage fluctuation of the adjustment range at the node is within a normal operation range;
performing secondary regulation, namely acquiring power flow control information on operating parameters of each power non-adjustable device and each power adjustable device of the traction substation through a comprehensive automatic subsystem of each traction substation of an urban rail traffic line, uploading the power flow control information to a unified power flow controller of a central comprehensive monitoring center through a communication network, performing unified power flow distribution management control on each power adjustable device of the traction substation, adjusting a reference value of primary regulation, reducing direct-current voltage deviation, and realizing optimal power flow of a direct-current traction network;
and the third adjustment is to perform traction power supply calculation according to a daily train operation plan to obtain a daily load curve, predict a new energy daily generated energy curve according to weather historical data prediction and new energy power generation historical data, optimize power flow calculation, determine power output plans of the adjustable power devices at different time periods, and realize economic and environmental-friendly scheduling through adjustment of the unified power flow controller.
As an optimization scheme of the above embodiment, the integrated automation subsystem of the traction substation includes an acquisition module and an RTU module, acquires real-time operating voltage, power and various state parameters of each traction substation along the line, including a power non-adjustable device and a power adjustable device, and uploads the operating voltage, power and various state parameters to a unified power flow control system of a central integrated monitoring center through a communication network; the collected power flow control information comprises real-time output power and voltage of a direct current side of a rectifier unit of a full-line traction substation, output power and voltage of a photovoltaic power generation system which is connected with a grid at the direct current traction side, discharge power, charging power, voltage, charge state and the like of an energy storage device, voltage of an inverter device, inversion feedback power and voltage, and rectification output power or inversion feedback power and voltage of a bidirectional inverter unit.
The power non-adjustable device comprises rectifier units of traction substations, and a photovoltaic energy storage power generation system of a vehicle section or a parking lot which is connected with the grid at the direct-current traction side of the traction substations; the power adjustable device comprises an energy storage device, an inversion feedback device and a bidirectional inverter set.
The power adjustable device comprises local controllers, primary adjustment is realized through the local controllers of the power adjustable devices of the respective traction substations according to a power-voltage characteristic curve, and the voltage fluctuation of a direct-current bus is adjusted to be within a normal operation range;
the local controller of the power adjustable device is an executor of secondary adjustment of the unified power flow controller on the basis of primary adjustment; the target power output by the optimal power flow calculation of the unified power flow controller is downloaded to a local controller of the power adjustable device through a central integrated monitoring center communication network, the target power is used as the reference power of the local controller, the output power of the power adjusting device is adjusted to reach the target value, the unified adjustment of the power adjustable device of the full-line direct current traction network is realized, the targets of minimum loss and minimum voltage fluctuation of the full-line direct current traction network are reached, and finally the full-line unified power flow control management of the direct current traction power supply system is realized.
As an optimization scheme of the above embodiment, the unified power flow controller realizes secondary regulation of a power flow of the direct current traction network; the integrated automation subsystem of each traction substation uploads real-time running voltage and power of a direct-current side power output device of each traction substation in a whole line to a unified power flow controller through an RTU (remote terminal Unit), the unified power flow controller takes the minimum power loss and the minimum voltage fluctuation of a direct-current traction network as targets, applies an output capacity limit value, a working voltage limit value and an energy storage device charge limit value of each power adjustable device as constraint conditions, formulates an energy distribution strategy, performs optimal power flow calculation, and determines the target power output of each traction substation power adjustable device; the optimal power output of the rectifier unit is realized, the direct current output voltage fluctuation of the full-line traction substation is minimized, the power flow is distributed according to the shortest path, the line voltage loss and the power loss of the full-line direct current traction power supply network are minimized, and the economic and technical indexes are optimal.
As an optimization scheme of the embodiment, the economic dispatching plan controller performs traction power supply calculation according to a daily train operation plan to obtain a daily load curve, predicts a new energy daily power generation curve according to weather historical data prediction and new energy power generation historical data, optimizes load flow calculation, determines power output plans of the adjustable power devices at different time intervals, pre-charging and discharging plans of the energy storage devices, forcibly inputs the pre-charging and discharging plans into the unified load flow controller for adjustment according to certain planning time, efficiently utilizes the photovoltaic power generation system, avoids light abandonment, performs peak clipping and valley filling and stabilizes network voltage through power control of the all-line adjustable power devices, and realizes economic and environment-friendly dispatching.
In order to cooperate with the realization of the method, based on the same inventive concept, as shown in fig. 3, the invention also provides a unified power flow control method for the photovoltaic energy storage traction power supply of the urban rail transit, which comprises the following steps:
s100, data acquisition and transmission: the method comprises the steps that collection and collection of real-time data are completed in a traction substation integrated automation subsystem, and power flow control information is transmitted to a unified power flow controller of a central integrated monitoring center through a remote terminal system RTU through a communication network;
s200, unified power flow control in secondary regulation: according to the collected power flow control information, aiming at the minimum power loss and the minimum voltage fluctuation of a direct current traction network in a unified power flow controller, applying constraint conditions of output capacity limit values, working voltage limit values and charge limit values of energy storage devices of all power adjustable devices, formulating an energy distribution strategy, performing optimal power flow calculation, performing unified power flow distribution management control on all the power adjustable devices of the traction substation, determining target power output of all the power adjustable devices of the traction substation, downloading the target power output to a local controller of the power adjustable devices through a communication network, and reducing direct current voltage deviation by taking the target power as a reference value for primary adjustment; the optimal power output of the rectifier unit is realized, the direct current output voltage fluctuation of the full-line traction substation is minimized, the power flow is distributed according to the shortest path, the line voltage loss and the power loss of the full-line direct current traction power supply network are minimized, and the economic and technical indexes are optimal;
s300, adjusting the medium economic dispatching plan for the third time: carrying out traction power supply calculation according to a daily train operation plan to obtain a daily load curve, predicting a new energy daily generated energy curve according to weather historical data prediction and new energy power generation historical data, optimizing load flow calculation, determining a power output plan of the adjustable power device at different time intervals, and a pre-charging and discharging plan of the energy storage device, and forcibly inputting the pre-charging and discharging plans into the unified load flow controller for adjustment according to a certain planning time; the photovoltaic power generation system is efficiently utilized, light abandonment is avoided, the effects of peak clipping, valley filling and net pressure stabilization are achieved through power control of the full-line power adjustable device, and economic and environment-friendly scheduling is achieved;
s400, controlling a power adjustable device in primary adjustment: the method comprises the steps that a local controller realizes primary regulation according to a power-voltage characteristic curve, and the voltage fluctuation of a direct-current bus is adjusted to be within a normal operation range; meanwhile, target power obtained after the unified power flow controller is optimized is used as reference power and is respectively transmitted to each power adjustable device controller, the controllers adjust output to enable the target power to be achieved, secondary adjustment is completed, whole-line power adjustment is finally achieved, the control targets of minimum line loss and minimum voltage fluctuation are completed, if the voltage difference between two traction substations is zero, the load can be guaranteed to be only powered by the adjacent substations, and the situation that the current path is increased through a path due to power supply across the substations, the line loss is increased, and the increase of the path of stray current brings the increase of the steel rail potential and the electric corrosion of surrounding metal pipelines is avoided.
The power flow control information collected in real time comprises AC-DC output voltage and current of a rectifier unit, total radiation illumination intensity Sref of a photovoltaic power generation system, surface temperature Tref, DC-DC output voltage and power, direct-current side voltage and power of an inversion feedback device, direct-current side voltage and power of a bidirectional inversion unit, and DC-DC output voltage, power and charge state of an energy storage device; and the real-time operating voltage and power of the direct-current side power output devices of all traction substations are uploaded to the unified power flow controller through the RTU module by the power flow control information acquired by the comprehensive automation subsystem of each traction substation.
The foregoing shows and describes the general principles and features of the present invention, together with the advantages thereof. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are described in the specification and illustrated only to illustrate the principle of the present invention, but that various changes and modifications may be made therein without departing from the spirit and scope of the present invention, which fall within the scope of the invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (8)
1. The unified power flow control system for the urban rail traffic photovoltaic energy storage traction power supply is characterized by comprising a power non-adjustable device and a power adjustable device in a direct-current traction power supply network of an urban rail traffic traction power supply system with photovoltaic energy storage power supply, controllers of all traction substation power adjustable devices participating in primary adjustment, a unified power flow controller participating in secondary adjustment, an economic dispatching plan controller participating in tertiary adjustment, a comprehensive automation subsystem of a traction substation, a central comprehensive monitoring system and a communication network; the direct-current traction power supply network is in communication connection with a traction substation integrated automation subsystem, and the traction substation integrated automation subsystem is connected to a communication network; the communication network transmits signals to each traction substation power adjustable device controller participating in primary adjustment, and each traction substation power adjustable device controller participating in primary adjustment transmits signals to a power unadjustable device and a power adjustable device in a direct-current traction power supply network; the communication network is also connected with a central integrated monitoring center, the central integrated monitoring center comprises a central integrated monitoring system, a unified power flow controller participating in secondary regulation, and an economic dispatching plan controller participating in tertiary regulation, wherein the unified power flow controller participating in secondary regulation is connected with the economic dispatching plan controller;
the primary adjustment is completed through a local controller of each traction substation power adjustable device, and the voltage fluctuation of the adjustment range at the node is within a normal operation range;
performing secondary regulation, namely acquiring power flow control information on operating parameters of each power non-adjustable device and each power adjustable device of the traction substation through a comprehensive automatic subsystem of each traction substation of an urban rail traffic line, uploading the power flow control information to a unified power flow controller of a central comprehensive monitoring center through a communication network, performing unified power flow distribution management control on each power adjustable device of the traction substation, adjusting a reference value of primary regulation, reducing direct-current voltage deviation, and realizing optimal power flow of a direct-current traction network;
and the third adjustment is to perform traction power supply calculation according to a daily train operation plan to obtain a daily load curve, predict a new energy daily generated energy curve according to weather historical data prediction and new energy power generation historical data, optimize load flow calculation, determine power output plans of the adjustable power devices in different time periods, and realize economic and environment-friendly scheduling through adjustment of the unified load flow controller.
2. The system for unified power flow control of energy storage traction power supply of urban rail transit photovoltaic according to claim 1, wherein the integrated automation subsystem of the traction substation comprises an acquisition module and an RTU module, acquires real-time operating voltage, power and various state parameters of each traction substation along the line, including a power non-adjustable device and a power adjustable device, and transmits the real-time operating voltage, power and various state parameters to the unified power flow control system of the central integrated monitoring center through a communication network; the collected power flow control information comprises real-time output power and voltage of a direct current side of a rectifier unit of a full-line traction substation, output power and voltage of a photovoltaic power generation system which is connected with a grid at the direct current traction side, discharge power, charging power, voltage and charge state of an energy storage device, voltage of an inverter device, inversion feedback power and voltage, and rectification output power or inversion feedback power and voltage of a bidirectional inverter unit.
3. The system for unified power flow control of urban rail transit photovoltaic energy storage traction power supply according to claim 2, wherein the power non-adjustable device comprises a rectifier unit of each traction substation, a photovoltaic energy storage power generation system of a vehicle section or a parking lot which is connected to the grid at the direct current traction side of the traction substation; the power adjustable device comprises an energy storage device, an inversion feedback device and a bidirectional inverter set.
4. The system of claim 3, wherein the power adjustable devices comprise local controllers, and the local controllers of the power adjustable devices of the respective traction substations realize primary adjustment according to a power-voltage characteristic curve to adjust the voltage fluctuation of the direct-current bus so as to enable the voltage fluctuation to be within a normal operation range;
the local controller of the power adjustable device is an executor of the secondary adjustment of the unified power flow controller on the basis of the primary adjustment; and the target power output by the optimal power flow calculation of the unified power flow controller is downloaded to a local controller of the power adjustable device through a central integrated monitoring center communication network, the target power is used as the reference power of the local controller, the output power of the power adjustable device is adjusted to reach the target value, the unified adjustment of the power adjustable device of the full-line direct current traction network is realized, the targets of minimum loss and minimum voltage fluctuation of the full-line direct current traction network are reached, and finally the full-line unified power flow control management of the direct current traction power supply system is realized.
5. The system for unified power flow control of urban rail transit photovoltaic energy storage traction power supply according to claim 4, wherein the unified power flow controller is used for realizing secondary regulation of power flow of a direct current traction network; the integrated automation subsystem of each traction substation uploads real-time operating voltage and power of a direct-current side power output device of each traction substation in a whole line to the unified power flow controller through the RTU module, the unified power flow controller takes minimum power loss and minimum voltage fluctuation of a direct-current traction network as targets, applies output capacity limit values, working voltage limit values and energy storage device charge limit values of all power adjustable devices as constraint conditions, formulates an energy distribution strategy, performs optimal power flow calculation, and determines target power output of each traction substation power adjustable device.
6. The system according to claim 4, wherein the economic dispatch plan controller performs tractive power supply calculation according to a daily train operation plan to obtain a daily load curve, predicts a new energy daily power generation curve according to weather historical data prediction and new energy power generation historical data prediction, optimizes power flow calculation, determines power output plans of the adjustable power devices at different time intervals, pre-charging and discharging plans of the energy storage devices, and forcibly inputs the pre-charging and discharging plans into the unified power flow controller for adjustment according to a certain planning time.
7. A unified power flow control method for photovoltaic energy storage traction power supply of urban rail transit is characterized by comprising the following steps:
s100, data acquisition and transmission: the method comprises the steps that real-time data collection is completed in a traction substation integrated automation subsystem, power flow control information is collected, and the power flow control information is transmitted to a unified power flow controller of a central integrated monitoring center through a remote terminal system RTU through a communication network;
s200, unified power flow control in secondary regulation: according to the collected power flow control information, aiming at the minimum power loss and the minimum voltage fluctuation of a direct current traction network in a unified power flow controller, applying constraint conditions of output capacity limit values, working voltage limit values and charge limit values of energy storage devices of all power adjustable devices, formulating an energy distribution strategy, performing optimal power flow calculation, performing unified power flow distribution management control on all the power adjustable devices of the traction substation, determining target power output of all the power adjustable devices of the traction substation, downloading the target power output to a local controller of the power adjustable devices through a communication network, and reducing direct current voltage deviation by taking the target power as a reference value for primary adjustment;
s300, adjusting the medium economic dispatching plan for the third time: carrying out traction power supply calculation according to a daily train operation plan to obtain a daily load curve, predicting a new energy daily generated energy curve according to weather historical data prediction and new energy power generation historical data, optimizing load flow calculation, determining a power output plan of the adjustable power device at different time intervals, and a pre-charging and discharging plan of the energy storage device, and forcibly inputting the pre-charging and discharging plans into the unified load flow controller for adjustment according to a certain planning time;
s400, controlling a power adjustable device in primary adjustment: the method comprises the steps that a local controller realizes primary regulation according to a power-voltage characteristic curve, and the voltage fluctuation of a direct-current bus is adjusted to be within a normal operation range; meanwhile, the target power obtained after the unified power flow controller is optimized is used as reference power and is respectively transmitted to each power adjustable device controller, the controller adjusts output to enable the target power to be achieved, secondary adjustment is completed, and finally full-line power adjustment is achieved.
8. The method for unified power flow control of urban rail transit photovoltaic energy storage tractive power supply according to claim 7, wherein the method is characterized in thatThe real-time collected power flow control information comprises AC-DC output voltage and current of a rectifier unit and total radiation illumination intensity S of the photovoltaic power generation system ref Surface temperature T ref The DC-DC output voltage and power, the DC side voltage and power of the inversion feedback device, the DC side voltage and power of the bidirectional inversion set, and the DC-DC output voltage, power and state of charge of the energy storage device; and the real-time operating voltage and power of the direct-current side power output devices of all traction substations are uploaded to the unified power flow controller through the RTU module by the power flow control information acquired by the comprehensive automation subsystem of each traction substation.
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