CN110460077B - Control method of new energy power supply system for urban rail traction network - Google Patents
Control method of new energy power supply system for urban rail traction network Download PDFInfo
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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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- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/50—Photovoltaic [PV] energy
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Abstract
The invention discloses a new energy power supply system for an urban rail traction network and a control method, wherein the new energy power supply system comprises an independent energy storage system positioned in the middle section of a line and a wind-solar-energy storage combined power generation system positioned in a vehicle section or a parking lot at the tail end of the line; obtaining load prediction power and an expected peak-valley value according to the offline prediction data and the historical data, and judging whether a load exists or not based on the urban rail driving data; and judging the operation condition according to the real-time voltage, comparing the load predicted power at the next moment with the expected peak-valley value, judging whether the load operation peak-valley state is the load operation peak-valley state, and determining different control strategies according to the judgment result to realize effective control of the energy storage device in the independent energy storage system, the wind-solar combined power generation device in the wind-solar combined power generation system and the energy storage device. The invention can promote the consumption of renewable energy sources such as local wind and light, improve the network pressure fluctuation, effectively recover the regenerative braking energy, simultaneously carry out peak clipping and valley filling on the load, reduce the urban rail operation cost and have good economic benefit.
Description
Technical Field
The invention belongs to the technical field of urban rail traction power supply, and particularly relates to a new energy power supply system for an urban rail traction network and a control method.
Background
With the acceleration of urbanization process in China, urban rail transit is rapidly and comprehensively developed in large and medium-sized cities. As late as 2017, urban rail transit is opened and put into operation in 34 cities in China, and it is expected that more than 50 cities in China will be opened and operated in 2020, and the length of an operating line exceeds 6000 km. Meanwhile, as the main energy-consuming households of cities, urban rails have a remarkable energy-saving problem and environmental protection problem due to high-speed development. Wherein, the energy consumption of the traction load accounts for about 55 percent of the total energy consumption of the urban rail. In order to realize energy conservation and consumption reduction, new energy is connected into the urban rail transit traction power supply system, so that the recovery of regenerative braking energy is promoted, load can be subjected to peak clipping and valley filling, the urban rail operation cost can be reduced, and the consumption of local renewable energy is promoted.
In various energy forms, wind energy and solar energy are most prominent and most widely applied, and geographical conditions are provided for access of large-area vehicle sections and parking lots along urban rail transit lines, outdoor elevated stations, elevated sections, subway entrances and exits and the like. However, wind energy and solar energy have certain intermittency and randomness, the independent operation and utilization efficiency is low, and stable energy output cannot be provided. The wind power generation system and the photovoltaic power generation system are combined, and the wind power generation system and the photovoltaic power generation system have natural complementarity in time and season, so that the fluctuation of output can be relieved, and the system can run more stably. In addition, the urban rail transit locomotive is a power source with large impact, the network voltage and wind-light equipment are greatly impacted by frequent starting and braking, an energy storage device is required to be added to cooperate with a wind-light combined system, light and wind abandoning is reduced, regenerative braking energy generated by a traction system is recycled, and the maximization of energy utilization is realized; meanwhile, peak clipping and valley filling are realized through energy storage, and fluctuation of the net pressure is stabilized.
At present, the wind-light-storage combined power generation system is not researched and applied to urban rail transit, and engineering application mainly focuses on photovoltaic integration into an alternating current network (35kV/33kV or 400V) side or energy storage integration into a traction network direct current (750V or 1500V) side. The direct access of the wind-light-storage system to the direct current traction power supply system has the advantages of obvious energy-saving effect, small line loss and unobvious harmonic pollution problem in theory. However, severe fluctuation of urban rail load directly impacts a system, the new energy power generation has uncertainty, the control is relatively complex, and the challenge is faced to whether the two parties can adapt well.
The existing scholars make preliminary researches on the integration of photovoltaic/energy storage into a traction network, and a wind-light-energy storage multi-energy complementary structure is not connected into an urban rail power supply system; the existing research focuses on the topological structure, the control strategy and the like of a system under a single substation, the energy flow condition of the whole line is not considered in the analysis process, and the structure of a new energy power generation system of the whole line is rarely mentioned in the literature; in the existing research, the peak clipping and valley filling are not considered when the regenerative braking energy is recovered by using the stored energy at the same time of the load peak in the morning and at the evening.
Disclosure of Invention
In order to solve the problems, the invention provides a new energy power supply system and a control method for an urban rail traction network, which effectively utilize the complementary advantages of wind, light and storage resources to improve the power supply reliability, utilize the stored energy to carry out peak clipping and valley filling on a load, efficiently recover regenerative braking energy, and promote energy conservation, emission reduction and new energy consumption; the method can promote the consumption of renewable energy sources such as local wind and light, improve the network pressure fluctuation, effectively recover the regenerative braking energy, and simultaneously carry out peak clipping and valley filling on the load, reduce the urban rail operation cost, and has good economic benefit.
In order to achieve the purpose, the invention adopts the technical scheme that: a control method for a new energy power supply system of an urban rail traction network comprises the steps that the new energy power supply system of the urban rail traction network comprises an independent energy storage system located at a middle traction substation in the middle section of a line and a wind-solar-energy storage combined power generation system located at a vehicle section at the tail end of the line or a parking lot substation; the control method of the new energy power supply system of the urban rail traction network comprises a control strategy of an independent energy storage system and a wind-solar energy storage combined power generation system, and comprises the following steps:
obtaining load prediction power and an expected peak-valley value according to the offline prediction data and the historical data, and judging whether a load exists or not based on the urban rail driving data;
collecting real-time operation data, judging an operation condition according to real-time voltage, comparing the load predicted power at the next moment with the expected peak-valley value, judging whether the load operation peak-valley state is the load operation peak-valley state, and determining different control strategies according to the judgment result;
and respectively establishing control strategies of the independent energy storage system and the wind-solar-energy storage combined power generation system according to the steps, and realizing effective control of the energy storage equipment in the independent energy storage system, the wind-solar-energy combined power generation device in the wind-solar-energy storage combined power generation system and the energy storage device.
Further, the independent energy storage system is installed in a traction substation in the middle section of a line of an urban rail traction power supply system, and is connected in parallel to a traction direct-current bus on the direct-current side of a rectifier unit through a bidirectional DC/DC converter, and the control method comprises the following steps:
s101, data acquisition and prediction: and (3) historical data prediction: forecasting the current day full-time load power P according to the historical data of the recent traction substation operationloadTo obtain a predicted expected peak value PpeakAnd an expected trough value Pval(ii) a Acquiring real-time data: acquiring real-time data of traction direct-current bus voltage U, the state of charge SOC of the energy storage state and the SOH value of the health state when T is T;
s102, determining whether a load exists between two adjacent traction substations at the position where the independent energy storage system is arranged through driving data obtained by a central comprehensive monitoring center; if not, executing step S103, otherwise, executing step S104;
s103, the independent energy storage system does not act, and the power grid maintains the no-load loss of the line or supplies energy to the load;
s104, judging whether the traction direct current bus voltage U is smaller than the lower limit U of the voltage threshold of the traction networkmin(ii) a If yes, go to step S105, otherwise go to step S106;
s105, judging the SOC>SOCminWhether or not it is established, SOCminIs the energy storage state of charge lower limit; if so, the independent energy storage system supplies power to the load, so that the power provided by the power grid is reduced, peak clipping is realized, and the shortage is complemented by the power grid; otherwise, go to step S103;
s106, judging whether the traction direct-current bus voltage U is larger than the upper limit U of the voltage threshold of the traction networkmax(ii) a If yes, go to step S107; otherwise, go to step S108;
s107, judging that SOC is less than SOCmaxWhether or not it is established, SOCmaxIs the upper limit value of the energy storage charge state; if so, the rectifier unit is turned off, the power grid stops supplying energy to the load, and the independent energy storage system absorbs regenerative braking energy generated by the locomotive; otherwise, go to step S103;
s108, judging whether the load is in the operation peak state at the moment T to T +1 according to the full-time power prediction data, namely Pload＞PpeakWhether the result is true or not; if yes, the independent energy storage system enters a pre-charging mode, the power grid charges the independent energy storage system, and the SOC is required to be less than the SOCmaxSo as to discharge at the peak moment of load and raise the voltage of traction network; otherwise, go to step S109;
s109, based on the prediction data, determines whether the load is in the running low valley state at time T +1, that is, Pload<PvalWhether the result is true or not; if so, the energy storage system enters a pre-discharge mode to consume the electric energy of the energy storage system and needs to meet the SOC requirement>SOCminSo as to absorb electric energy when the load is at a low valley and reduce the network voltage; otherwise, go to step S103;
s110, adding 1 to T accumulation and judging whether T is less than the termination time T0(ii) a If yes, updating the time T, assigning the accumulated T value to the time T, and skipping to the step S101; otherwise, ending the operation.
Further, the wind-solar-energy-storage combined power generation system comprises a wind-solar-energy combined power generation system and an energy storage device, is arranged at a vehicle section or a parking lot at the tail end of a line, and is connected in parallel to a traction direct-current bus on the direct-current side of a rectifier unit of a traction substation nearby through a converter, and the control method comprises the following steps:
s201, historical data prediction: predicting the load power at the full time of the day according to the historical data of the recent traction substation operation, wherein the predicted peak clipping and valley filling expected value comprises an expected peak value PpeakAnd an expected trough value Pval(ii) a Acquiring real-time data: load power P including T-T timeload(T), traction direct current bus voltage U and fan output power PwindPhotovoltaic output power PpvActual measurement data of the state of charge (SOC) and the state of health (SOH) values of the energy storage state;
s202, judging whether the wind-solar combined power generation system outputs power, namely Pwind+PpvIf > 0 is true; if yes, go to step S203; otherwise, executing the control method operation steps of the independent energy storage system;
s203, determining whether a load exists between the transformer substation and an adjacent transformer substation through the driving data obtained by the central comprehensive monitoring center; if not, executing step S204, otherwise, executing step S205;
s204, judging that SOC is less than SOCmaxWhether or not it is established, SOCmaxIs the upper limit value of the energy storage charge state; if so, the wind-solar combined power generation system charges the energy storage device, and if the energy is left, the wind-solar combined power generation system carries out absorption treatment; otherwise, the energy storage device does not act, and the generated energy of the wind-solar combined power generation system is consumed;
s205, judging whether the traction direct current bus voltage U is larger than the upper limit U of the voltage threshold of the traction networkmaxI.e. U>Umax(ii) a If yes, the regenerative electric energy generated by the auxiliary locomotive brake is charged to the energy storage device, and the SOC is required to be less than the SOCmaxThe wind-solar hybrid power generation system does not supply power to the load and the energy storage device under the charging condition of the wind-solar hybrid power generation system, and the generated power can be consumed; if not, go to step S206;
s206, judging whether the traction direct current bus voltage U is smaller than the voltage threshold value small limit U of the traction networkminI.e. U<Umin(ii) a If yes, judging Pload(T) whether P is present or notwind+PpvIf the former is larger than the latter, the wind-light combined power generation system and the energy storage system supply power to the load and need to meet the SOC>SOCminThe shortage is complemented by the power grid; if the former is smaller than the latter, the wind-solar combined power generation system has surplus energy after supplying energy to the load, the wind-solar combined power generation system supplies power to the traction load, the surplus energy charges the energy storage device, and the SOC is required to be less than the SOCmaxIf the charging condition is remained, the electric energy is consumed; if not, go to step S207;
s207, based on the full-time power prediction data, determines whether the load is in the peak operating state at the time T +1, i.e., determines the predicted power Pload(T+1)＞PpeakWhether the result is true or not; if so, the wind-solar hybrid power generation system supplies power to the load, and the shortage is complemented by the power grid; the energy storage device enters a pre-charging mode, the power grid charges the energy storage device, and the SOC is less than the SOCmaxTo discharge at the next moment of peak load operation; if not, go to step S208;
s208, judging whether the load is in low operation at the moment when T is T +1 according to the prediction dataValley state, i.e. determining the predicted power Pload(T+1)＜PvalWhether the result is true or not; if so, the wind-solar combined power generation system supplies power to the load, the shortage is complemented by the power grid, the energy storage device enters a pre-discharge mode, the power grid charges the energy storage device, and the SOC is required to be met>SOCminSo as to absorb electrical energy at the next instant; if not, the wind-solar hybrid power generation system and the energy storage system supply power to the load in sequence and need to meet the SOC>SOCminThe shortage is complemented by the power grid;
s209, adding 1 to T accumulation and judging whether T is less than the termination time T0(ii) a If yes, updating the time T, assigning the accumulated T value to the time T, and skipping to the step S201; otherwise, ending the operation.
On the other hand, the invention also provides a new energy power supply system for the urban rail traction network, which comprises an urban power grid (1), a main substation (2), an energy storage traction substation (3), a wind-solar energy storage traction substation (4), a direct current traction bus (5) and a traction network; the main substation (2) gets electricity from the urban power grid (1), and the main substation (2) transmits electric energy to a traction substation along the line through voltage conversion; the traction substation along the line comprises an energy storage traction substation (3) positioned in the middle section of the line and a wind and light storage traction substation (4) positioned at a vehicle section or a parking lot at the tail end of the line;
an independent energy storage system (8) is installed at the energy storage traction substation (3), a wind-solar-storage combined power generation system (9) is installed at the wind-solar-storage traction substation (4), and the energy storage traction substation (3) and the wind-solar-storage traction substation (4) are connected to respective traction direct-current buses; the energy storage traction substation (3) is connected to a traction direct current bus I (51) through a rectifier transformer I (101) and a rectifier unit I (111); the wind-solar storage traction substation (4) is connected to a traction direct-current bus II (52) through a rectifier transformer II (102) and a rectifier unit II (112); and the traction direct current bus I (51) and the traction direct current bus II (52) are both connected with a traction network.
Further, the independent energy storage system (8) comprises an energy storage device (81), a bidirectional DC/DC converter (82) and an energy storage energy controller (83); the energy storage device (81) is connected with a bidirectional DC/DC converter (82), and the output side of the bidirectional DC/DC converter (82) is connected into a traction direct current bus I (51); the energy storage energy controller (83) is in communication connection with the bidirectional DC/DC converter (82), and reasonable output and storage of energy of the energy storage device are achieved by controlling the bidirectional DC/DC converter (82).
Further, the wind-solar-energy-storage combined power generation system (9) comprises a wind power generation device (91), a photovoltaic power generation device (92), an energy storage device (93) and a comprehensive controller (94), wherein the wind power generation device (91), the photovoltaic power generation device (92) and the energy storage device (93) are connected in parallel and then connected to a traction direct-current bus II (52), and the comprehensive controller (94) is respectively connected with control ends of the wind power generation device (91), the photovoltaic power generation device (92) and the energy storage device (93) to control working states of the wind power generation device (91), the photovoltaic power generation device (92) and the energy storage device (93) and coordinate output of the wind-solar-energy-storage combined power generation system (9) in real time; the energy of the whole system is reasonably and efficiently utilized, and the maximum power tracking of a wind and light system and the state monitoring of the energy storage device are completed simultaneously.
Further, the wind power generation device (91) comprises a wind wheel (911), a gear machine (912), a wind power generator (913) and an AC/DC converter (914); the wind wheel (911) generates kinetic energy under the action of wind power, the kinetic energy is transmitted to the wind driven generator (913) through the gear wheel machine (912), the wind driven generator (913) obtains corresponding rotating speed to generate alternating current, the alternating current is converted into direct current meeting grid connection requirements through the AC/DC converter (914), and the direct current is connected to the traction direct current bus II (52); the integrated controller (94) controls an AC/DC converter (414).
Further, the photovoltaic power generation device (92) comprises a photovoltaic module (921) and a DC/DC converter (922), wherein the DC/DC converter (922) converts the generated energy of the photovoltaic module (921) into voltage and then integrates the voltage into a traction direct current bus II (52); the integrated controller (94) controls the DC/DC converter (922).
Further, the energy storage device (93) comprises an energy storage unit (931) and an energy storage DC/DC converter (932), wherein the energy storage unit (931) is incorporated into the traction direct current bus II (52) through the energy storage DC/DC converter (932); the integrated controller (94) controls an energy storage DC/DC converter (932).
Further, the traction net comprises a contact net (6) and a steel rail (7), and the locomotive is arranged between the contact net (6) and the steel rail (7); and positive buses of the traction direct current bus I (51) and the traction direct current bus II (52) are connected with a contact net (6), and negative buses of the traction direct current bus I (51) and the traction direct current bus II (52) are connected with a steel rail (7).
The beneficial effects of the technical scheme are as follows:
the invention fully considers the actual geographical situation of urban rail transit, installs different forms of new energy devices at the traction substation of the whole urban rail power supply line, and adopts different control methods to control respectively. The wind-light-storage power generation device at the vehicle section/parking lot is cooperatively controlled, the output is distributed according to the requirement, the energy flow of the independent energy storage power generation device at the middle section of the line is reasonably planned, and the efficient utilization of the system electric energy of the whole section of the line is realized.
The wind energy-solar energy-energy storage multi-energy complementary combined power generation device is adopted, and compared with a photovoltaic energy storage power generation system, the wind power generation combined power generation device can reduce energy storage capacity to a certain extent and reduce initial investment. Meanwhile, wind and light output is complementary, output fluctuation is reduced, and power supply reliability is improved.
The invention fully utilizes the characteristics of urban rail load: the locomotive has the characteristics of frequent start and stop and more regenerative braking energy, and an energy storage device is utilized for recycling; the load capacity of the peak is large in morning and evening, the time is fixed, peak clipping and valley filling are carried out through energy storage equipment, and economic benefits are achieved.
The photovoltaic power generation system provides electric energy for the urban rail direct current traction network, and the energy storage technology is matched with the photovoltaic power generation system, so that the braking energy can be recovered, the network voltage lifting is prevented from exceeding the limit, the voltage quality is improved, and certain economic benefit is achieved; the energy storage device releases power when photovoltaic power generation is insufficient and the grid voltage is too low, energy is stored when the photovoltaic power generation is sufficient and the load is small, the effect of clipping peak, filling valley and stabilizing the grid voltage is achieved, the defect of concentrated photovoltaic power generation time is overcome, light abandonment is avoided, the influence on a system caused by the volatility and the intermittence of photovoltaic output is relieved, on-site consumption of clean energy is facilitated, the electric energy quality of operation of a traction power supply system can be improved, the urban rail transit energy consumption structure is facilitated to be improved, the urban rail operation cost is reduced, environmental protection benefits and economic benefits are achieved, energy conservation and emission reduction of rail transit are achieved, and green sustainable development is achieved.
Drawings
Fig. 1 is a schematic flow chart of a new energy power supply system and a control method for an urban rail traction network according to the present invention;
FIG. 2 is a flow chart of a method for controlling a strategy of an independent energy storage system according to an embodiment of the present invention;
FIG. 3 is a schematic flow chart of a method for controlling a control strategy of a wind-solar-energy-storage combined power generation system in an embodiment of the invention;
fig. 4 is a schematic structural diagram of a new energy power supply system and a control method for an urban rail traction network according to the present invention;
FIG. 5 is a schematic view of a topology of an independent energy storage system according to an embodiment of the present invention;
FIG. 6 is a schematic topological structure diagram of a wind-solar-energy-storage combined power generation system in an embodiment of the invention;
the system comprises a power grid, a wind-solar energy storage traction substation, a main substation, an energy storage traction substation, a wind-solar energy storage traction substation, a traction direct current bus I51, a traction direct current bus II 52, a contact network 6, a steel rail 7, an independent energy storage system 8, a wind-solar energy storage combined power generation system 9, a rectifier transformer I101, a rectifier transformer II 102, a rectifier unit I111 and a rectifier unit II 112, wherein the power grid is an urban power grid; 81 is an energy storage device, 82 is a bidirectional DC/DC converter, and 83 is an energy storage energy controller; 91 is a wind power generation device, 92 is a photovoltaic power generation device, 93 is an energy storage device, and 94 is a comprehensive controller; 911 is a wind wheel, 912 is a gear machine, 913 is a wind generator, 914 is an AC/DC converter; 921 is a photovoltaic module, 922 is a DC/DC converter; 931 is an energy storage unit, and 932 is an energy storage DC/DC converter.
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, a control method for a new energy power supply system of an urban rail traction network includes an independent energy storage system located at a middle traction substation in a middle section of a line and a wind-solar-energy storage combined power generation system located at a vehicle section at the end of the line or a parking lot substation; the control method of the new energy power supply system of the urban rail traction network comprises a control strategy of an independent energy storage system and a wind-solar energy storage combined power generation system, and comprises the following steps:
obtaining load prediction power and an expected peak-valley value according to the offline prediction data and the historical data, and judging whether a load exists or not based on the urban rail driving data;
collecting real-time operation data, judging an operation condition according to real-time voltage, comparing the load predicted power at the next moment with the expected peak-valley value, judging whether the load operation peak-valley state is the load operation peak-valley state, and determining different control strategies according to the judgment result;
and respectively establishing control strategies of the independent energy storage system and the wind-solar-energy storage combined power generation system according to the steps, and realizing effective control of the energy storage equipment in the independent energy storage system, the wind-solar-energy combined power generation device in the wind-solar-energy storage combined power generation system and the energy storage device.
As an optimized solution of the above embodiment, as shown in fig. 2, the independent energy storage system is installed in a traction substation in the middle section of a line of an urban rail traction power supply system, and is connected in parallel to a traction DC bus on the DC side of a rectifier unit through a bidirectional DC/DC converter, and the control method includes the following steps:
s101, data acquisition and prediction: and (3) historical data prediction: forecasting the current day full-time load power P according to the historical data of the recent traction substation operationloadTo obtain a predicted expected peak value PpeakAnd an expected trough value Pval(ii) a Acquiring real-time data: acquiring real-time data of traction direct-current bus voltage U, the state of charge SOC of the energy storage state and the SOH value of the health state when T is T;
s102, determining whether a load exists between two adjacent traction substations at the position where the independent energy storage system is arranged through driving data obtained by a central comprehensive monitoring center; if not, executing step S103, otherwise, executing step S104;
s103, the independent energy storage system does not act, and the power grid maintains the no-load loss of the line or supplies energy to the load;
s104, judging whether the traction direct current bus voltage U is smaller than the lower limit U of the voltage threshold of the traction networkmin(ii) a If yes, go to step S105, otherwise go to step S106;
s105, judging the SOC>SOCminWhether or not it is established, SOCminIs the energy storage state of charge lower limit; if so, the independent energy storage system supplies power to the load, so that the power provided by the power grid is reduced, peak clipping is realized, and the shortage is complemented by the power grid; otherwise, go to step S103;
s106, judging whether the traction direct-current bus voltage U is larger than the upper limit U of the voltage threshold of the traction networkmax(ii) a If yes, go to step S107; otherwise, go to step S108;
s107, judging that SOC is less than SOCmaxWhether or not it is established, SOCmaxIs the upper limit value of the energy storage charge state; if so, the rectifier unit is turned off, the power grid stops supplying energy to the load, and the independent energy storage system absorbs regenerative braking energy generated by the locomotive; otherwise, go to step S103;
s108, judging whether the load is in the operation peak state at the moment T to T +1 according to the full-time power prediction data, namely Pload＞PpeakWhether the result is true or not; if yes, the independent energy storage system enters a pre-charging mode, the power grid charges the independent energy storage system, and the SOC is required to be less than the SOCmaxSo as to discharge at the peak moment of load and raise the voltage of traction network; otherwise, go to step S109;
s109, based on the prediction data, determines whether the load is in the running low valley state at time T + 1, that is, Pload<PvalWhether the result is true or not; if so, the energy storage system enters a pre-discharge mode to consume the electric energy of the energy storage system and needs to meet the SOC requirement>SOCminSo as to absorb electric energy when the load is at a low valley and reduce the network voltage; otherwise, go to step S103;
s110, adding 1 to T accumulation and judging whether T is less than the termination time T0(ii) a If yes, updating the time T, assigning the accumulated T value to the time T, and skipping to the step S101; otherwise, ending the operation.
As an optimized solution of the above embodiment, as shown in fig. 3, the wind-solar-energy-storage combined power generation system includes a wind-solar-energy combined power generation system and an energy storage device, and is installed at a vehicle section or a parking lot at the end of a line, and is connected in parallel to a traction dc bus on the dc side of a rectifier set of a traction substation nearby through a converter, and the control method includes the steps of:
s201, historical data prediction: predicting the load power at the full time of the day according to the historical data of the recent traction substation operation, wherein the predicted peak clipping and valley filling expected value comprises an expected peak value PpeakAnd an expected trough value Pval(ii) a Acquiring real-time data: load power P including T-T timeload(T), traction direct current bus voltage U and fan output power PwindPhotovoltaic output power PpvActual measurement data of the state of charge (SOC) and the state of health (SOH) values of the energy storage state;
s202, judging whether the wind-solar combined power generation system outputs power, namely Pwind+PpvIf > 0 is true; if yes, go to step S203; otherwise, executing the control method operation steps of the independent energy storage system;
s203, determining whether a load exists between the transformer substation and an adjacent transformer substation through the driving data obtained by the central comprehensive monitoring center; if not, executing step S204, otherwise, executing step S205;
s204, judging that SOC is less than SOCmaxWhether or not it is established, SOCmaxIs the upper limit value of the energy storage charge state; if so, the wind-solar combined power generation system charges the energy storage device, and if the energy is left, the wind-solar combined power generation system carries out absorption treatment; otherwise, the energy storage device does not act, and the generated energy of the wind-solar combined power generation system is consumed;
s205, judging whether the traction direct current bus voltage U is larger than the upper limit U of the voltage threshold of the traction networkmaxI.e. U>Umax(ii) a If yes, the regenerative electric energy generated by the auxiliary locomotive brake is charged to the energy storage device, and the SOC is required to be less than the SOCmaxThe wind-solar hybrid power generation system does not supply power to the load and the energy storage device under the charging condition of the wind-solar hybrid power generation system, and the generated power can be consumed; if not, go to step S206;
s206, judging whether the traction direct current bus voltage U is less than the traction networkVoltage threshold small limit UminI.e. U<Umin(ii) a If yes, judging Pload(T) whether P is present or notwind+PpvIf the former is larger than the latter, the wind-light combined power generation system and the energy storage system supply power to the load and need to meet the SOC>SOCminThe shortage is complemented by the power grid; if the former is smaller than the latter, the wind-solar combined power generation system has surplus energy after supplying energy to the load, the wind-solar combined power generation system supplies power to the traction load, the surplus energy charges the energy storage device, and the SOC is required to be less than the SOCmaxIf the charging condition is remained, the electric energy is consumed; if not, go to step S207;
s207, based on the full-time power prediction data, determines whether the load is in the peak operating state at the time T + 1, i.e., determines the predicted power Pload(T+1)＞PpeakWhether the result is true or not; if so, the wind-solar hybrid power generation system supplies power to the load, and the shortage is complemented by the power grid; the energy storage device enters a pre-charging mode, the power grid charges the energy storage device, and the SOC is less than the SOCmaxTo discharge at the next moment of peak load operation; if not, go to step S208;
s208, judging whether the load is in a low-valley state at the moment when T is T +1 according to the prediction data, namely judging the predicted power Pload(T+1)＜PvalWhether the result is true or not; if so, the wind-solar combined power generation system supplies power to the load, the shortage is complemented by the power grid, the energy storage device enters a pre-discharge mode, the power grid charges the energy storage device, and the SOC is required to be met>SOCminSo as to absorb electrical energy at the next instant; if not, the wind-solar hybrid power generation system and the energy storage system supply power to the load in sequence and need to meet the SOC>SOCminThe shortage is complemented by the power grid.
S209, adding 1 to T accumulation and judging whether T is less than the termination time T0(ii) a If yes, updating the time T, assigning the accumulated T value to the time T, and skipping to the step S201; otherwise, ending the operation.
In order to match the realization of the method of the invention, based on the same inventive concept, as shown in fig. 4, the invention also provides a new energy power supply system for an urban rail traction network, which comprises an urban power grid 1, a main substation 2, an energy storage traction substation 3, a wind-solar energy storage traction substation 4, a direct current traction bus 5 and a traction network; the main substation 2 gets electricity from the urban power grid 1, and the main substation 2 transmits electric energy to a traction substation along the line through voltage conversion; the line traction substation comprises an energy storage traction substation 3 positioned in the middle section of the line and a wind and light storage traction substation 4 positioned at a vehicle section or a parking lot at the tail end of the line;
an independent energy storage system 8 is installed at the energy storage traction substation 3, a wind-solar-storage combined power generation system 9 is installed at the wind-solar-storage traction substation 4, and the energy storage traction substation 3 and the wind-solar-storage traction substation 4 are connected to respective traction direct-current buses; the energy storage traction substation 3 is connected to a traction direct current bus I51 through a rectifier transformer I101 and a rectifier unit I111; the wind-solar storage traction substation 4 is connected to a traction direct-current bus II 52 through a rectifier transformer II 102 and a rectifier unit II 112; and the traction direct current bus I51 and the traction direct current bus II 52 are both connected with a traction network.
As an optimized solution of the above embodiment, as shown in fig. 5, the independent energy storage system 8 includes an energy storage device 81, a bidirectional DC/DC converter 82, and an energy storage controller 83; the energy storage device 81 is connected with a bidirectional DC/DC converter 82, and the output side of the bidirectional DC/DC converter 82 is connected to a traction direct current bus I51; the energy storage energy controller 83 is in communication connection with the bidirectional DC/DC converter 82, and reasonable output and storage of energy of the energy storage device are realized by controlling the bidirectional DC/DC converter 82.
As an optimization scheme of the above embodiment, as shown in fig. 6, the wind, photovoltaic and energy storage combined power generation system 9 includes a wind power generation device 91, a photovoltaic power generation device 92, an energy storage device 93 and a comprehensive controller 94, the wind power generation device 91, the photovoltaic power generation device 92 and the energy storage device 93 are connected in parallel and then connected to a traction dc bus ii 52, the comprehensive controller 94 is respectively connected to control ends of the wind power generation device 91, the photovoltaic power generation device 92 and the energy storage device 93 to control working states of the wind power generation device 91, the photovoltaic power generation device 92 and the energy storage device 93, and output of the wind, photovoltaic and energy storage combined power generation system 9 is coordinated in real time; the energy of the whole system is reasonably and efficiently utilized, and the maximum power tracking of a wind and light system and the state monitoring of the energy storage device are completed simultaneously.
Wherein, the wind power generation device 91 comprises a wind wheel 911, a gear 912, a wind power generator 913 and an AC/DC converter 914; the wind wheel 911 generates kinetic energy under the action of wind power, the kinetic energy is transmitted to the wind driven generator 913 through the gear 912, the wind driven generator 913 obtains corresponding rotating speed to generate alternating current, the alternating current is converted into direct current meeting grid connection requirements through the AC/DC converter 914, and the direct current is connected to the traction direct current bus II 52; the integrated controller 94 controls the AC/DC converter 414.
The photovoltaic power generation device 92 comprises a photovoltaic module 921 and a DC/DC converter 922, wherein the DC/DC converter 922 converts the voltage of the electric energy generated by the photovoltaic module 921 and incorporates the electric energy into a traction direct current bus ii 52; the integrated controller 94 controls the DC/DC converter 922.
The energy storage device 93 comprises an energy storage unit 931 and an energy storage DC/DC converter 932, wherein the energy storage unit 931 is incorporated into the traction direct current bus II 52 through the energy storage DC/DC converter 932; the integrated controller 94 controls the energy storage DC/DC converter 932.
As an optimized scheme of the embodiment, the traction net comprises a contact net 6 and a steel rail 7, and the locomotive is arranged between the contact net 6 and the steel rail 7; the positive buses of the traction direct current bus I51 and the traction direct current bus II 52 are connected with a contact net 6, and the negative buses of the traction direct current bus I51 and the traction direct current bus II 52 are connected with a steel rail 7.
The foregoing shows and describes the general principles and broad features of the present invention and 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 (7)
1. A control method for a new energy power supply system of an urban rail traction network is characterized in that the new energy power supply system of the urban rail traction network comprises an independent energy storage system located at a middle traction substation in the middle section of a line and a wind-solar-energy storage combined power generation system located at a vehicle section at the tail end of the line or a parking lot substation;
the new energy power supply system for the urban rail traction network comprises an urban power grid (1), a main substation (2), an energy storage traction substation (3), a wind-solar energy storage traction substation (4), a direct-current traction bus (5) and a traction network; the main substation (2) gets electricity from the urban power grid (1), and the main substation (2) transmits electric energy to a traction substation along the line through voltage conversion; the traction substation along the line comprises an energy storage traction substation (3) positioned in the middle section of the line and a wind and light storage traction substation (4) positioned at a vehicle section or a parking lot at the tail end of the line;
an independent energy storage system (8) is installed at the energy storage traction substation (3), a wind-solar-storage combined power generation system (9) is installed at the wind-solar-storage traction substation (4), and the energy storage traction substation (3) and the wind-solar-storage traction substation (4) are connected to respective traction direct-current buses; the energy storage traction substation (3) is connected to a traction direct current bus I (51) through a rectifier transformer I (101) and a rectifier unit I (111); the wind-solar storage traction substation (4) is connected to a traction direct-current bus II (52) through a rectifier transformer II (102) and a rectifier unit II (112); the traction direct current bus I (51) and the traction direct current bus II (52) are both connected with a traction network;
the control method of the new energy power supply system of the urban rail traction network comprises a control strategy of an independent energy storage system and a wind-solar energy storage combined power generation system, and comprises the following steps:
obtaining load prediction power and an expected peak-valley value according to the offline prediction data and the historical data, and judging whether a load exists or not based on the urban rail driving data;
collecting real-time operation data, judging an operation condition according to real-time voltage, comparing the load predicted power at the next moment with the expected peak-valley value, judging whether the load operation peak-valley state is the load operation peak-valley state, and determining different control strategies according to the judgment result;
respectively establishing control strategies of the independent energy storage system and the wind-solar-energy storage combined power generation system according to the steps, and realizing effective control of the energy storage equipment in the independent energy storage system, the wind-solar combined power generation device in the wind-solar-energy storage combined power generation system and the energy storage device;
the independent energy storage system is arranged in a traction substation in the middle section of a line of an urban rail traction power supply system and is connected in parallel with a traction direct-current bus on the direct-current side of a rectifier unit through a bidirectional DC/DC converter, and the control method comprises the following steps:
s101, data acquisition and prediction: and (3) historical data prediction: forecasting the current day full-time load power P according to the historical data of the recent traction substation operationloadTo obtain a predicted expected peak value PpeakAnd an expected trough value Pval(ii) a Acquiring real-time data: acquiring real-time data of traction direct-current bus voltage U, the state of charge SOC of the energy storage state and the SOH value of the health state when T is T;
s102, determining whether a load exists between two adjacent traction substations at the position where the independent energy storage system is arranged through driving data obtained by a central comprehensive monitoring center; if not, executing step S103, otherwise, executing step S104;
s103, the independent energy storage system does not act, and the power grid maintains the no-load loss of the line or supplies energy to the load;
s104, judging whether the traction direct current bus voltage U is smaller than the lower limit U of the voltage threshold of the traction networkmin(ii) a If yes, go to step S105, otherwise go to step S106;
s105, judging the SOC>SOCminWhether or not it is established, SOCminIs the energy storage state of charge lower limit; if so, the independent energy storage system supplies power to the load, so that the power provided by the power grid is reduced, peak clipping is realized, and the shortage is complemented by the power grid; otherwise, go to step S103;
s106, judging whether the traction direct-current bus voltage U is larger than the upper limit U of the voltage threshold of the traction networkmax(ii) a If yes, go to step S107; otherwise, go to step S108;
s107, judging that SOC is less than SOCmaxWhether or not it is established, SOCmaxIs the upper limit value of the energy storage charge state; if yes, the rectifier unitThe power system is turned off, the power grid stops supplying energy to the load, and the independent energy storage system absorbs regenerative braking energy generated by the locomotive; otherwise, go to step S103;
s108, judging whether the load is in the operation peak state at the moment T to T +1 according to the full-time power prediction data, namely Pload＞PpeakWhether the result is true or not; if yes, the independent energy storage system enters a pre-charging mode, the power grid charges the independent energy storage system, and the SOC is required to be less than the SOCmaxThe charging condition of (1); otherwise, go to step S109;
s109, based on the prediction data, determines whether the load is in the running low valley state at time T +1, that is, Pload<PvalWhether the result is true or not; if so, the energy storage system enters a pre-discharge mode to consume the electric energy of the energy storage system and needs to meet the SOC requirement>SOCminThe discharge conditions of (1); otherwise, go to step S103;
s110, adding 1 to T accumulation and judging whether T is less than the termination time T0(ii) a If yes, updating the time T, assigning the accumulated T value to the time T, and skipping to the step S101; otherwise, ending the operation;
the wind-solar-energy-storage combined power generation system comprises a wind-solar combined power generation system and an energy storage device, is arranged at a vehicle section or a parking lot at the tail end of a line, and is connected in parallel to a traction direct-current bus at the direct-current side of a rectifier unit of a traction substation nearby through a converter, and the control method comprises the following steps:
s201, historical data prediction: predicting the load power at the full time of the day according to the historical data of the recent traction substation operation, wherein the predicted peak clipping and valley filling expected value comprises an expected peak value PpeakAnd an expected trough value Pval(ii) a Acquiring real-time data: load power P including T-T timeload(T), traction direct current bus voltage U and fan output power PwindPhotovoltaic output power PpvActual measurement data of the state of charge (SOC) and the state of health (SOH) values of the energy storage state;
s202, judging whether the wind-solar combined power generation system outputs power, namely Pwind+PpvIf > 0 is true; if yes, go to step S203; otherwise, executing the control method operation steps of the independent energy storage system;
s203, determining whether a load exists between the transformer substation and an adjacent transformer substation through the driving data obtained by the central comprehensive monitoring center; if not, executing step S204, otherwise, executing step S205;
s204, judging that SOC is less than SOCmaxWhether or not it is established, SOCmaxIs the upper limit value of the energy storage charge state; if so, the wind-solar combined power generation system charges the energy storage device, and if the energy is left, the wind-solar combined power generation system carries out absorption treatment; otherwise, the energy storage device does not act, and the generated energy of the wind-solar combined power generation system is consumed;
s205, judging whether the traction direct current bus voltage U is larger than the upper limit U of the voltage threshold of the traction networkmaxI.e. U>Umax(ii) a If yes, the regenerative electric energy generated by the auxiliary locomotive brake is charged to the energy storage device, and the SOC is required to be less than the SOCmaxThe wind-solar hybrid power generation system does not supply power to the load and the energy storage device under the charging condition of the wind-solar hybrid power generation system, and the generated power can be consumed; if not, go to step S206;
s206, judging whether the traction direct current bus voltage U is smaller than the voltage threshold value small limit U of the traction networkminI.e. U<Umin(ii) a If yes, judging Pload(T) whether P is present or notwind+PpvIf the former is larger than the latter, the wind-light combined power generation system and the energy storage system supply power to the load and need to meet the SOC>SOCminThe shortage is complemented by the power grid; if the former is smaller than the latter, the wind-solar combined power generation system has surplus energy after supplying energy to the load, the wind-solar combined power generation system supplies power to the traction load, the surplus energy charges the energy storage device, and the SOC is required to be less than the SOCmaxIf the charging condition is remained, the electric energy is consumed; if not, go to step S207;
s207, based on the full-time power prediction data, determines whether the load is in the peak operating state at the time T +1, i.e., determines the predicted power Pload(T+1)＞PpeakWhether the result is true or not; if so, the wind-solar hybrid power generation system supplies power to the load, and the shortage is complemented by the power grid; the energy storage device enters a pre-charging mode, the power grid charges the energy storage device, and the SOC is less than the SOCmaxTo discharge at the next moment of peak load operation; if not, executing the stepStep S208;
s208, judging whether the load is in a low-valley state at the moment when T is T +1 according to the prediction data, namely judging the predicted power Pload(T+1)＜PvalWhether the result is true or not; if so, the wind-solar combined power generation system supplies power to the load, the shortage is complemented by the power grid, the energy storage device enters a pre-discharge mode, the power grid charges the energy storage device, and the SOC is required to be met>SOCminSo as to absorb electrical energy at the next instant; if not, the wind-solar hybrid power generation system and the energy storage system supply power to the load in sequence and need to meet the SOC>SOCminThe shortage is complemented by the power grid;
s209, adding 1 to T accumulation and judging whether T is less than the termination time T0(ii) a If yes, updating the time T, assigning the accumulated T value to the time T, and skipping to the step S201; otherwise, ending the operation.
2. The control method of the new energy power supply system for the urban rail traction network according to claim 1, characterized in that the independent energy storage system (8) comprises an energy storage device (81), a bidirectional DC/DC converter (82) and an energy storage energy controller (83); the energy storage device (81) is connected with a bidirectional DC/DC converter (82), and the output side of the bidirectional DC/DC converter (82) is connected into a traction direct current bus I (51); the energy storage energy controller (83) is in communication connection with the bidirectional DC/DC converter (82), and reasonable output and storage of energy of the energy storage device are achieved by controlling the bidirectional DC/DC converter (82).
3. The control method of the new energy power supply system for the urban rail traction network according to claim 1, wherein the wind-solar-energy-storage combined power generation system (9) comprises a wind power generation device (91), a photovoltaic power generation device (92), an energy storage device (93) and a comprehensive controller (94), the wind power generation device (91), the photovoltaic power generation device (92) and the energy storage device (93) are connected in parallel and then connected to a traction direct current bus II (52), and the comprehensive controller (94) is respectively connected to control ends of the wind power generation device (91), the photovoltaic power generation device (92) and the energy storage device (93) to control working states of the wind power generation device (91), the photovoltaic power generation device (92) and the energy storage device (93) and coordinate output of the wind-solar-energy-storage combined power generation system (9) in real time.
4. A control method for a new energy supply system for an urban rail traction network according to claim 3, characterized in that said wind power plant (91) comprises a wind rotor (911), a gear machine (912), a wind generator (913) and an AC/DC converter (914); the wind wheel (911) generates kinetic energy under the action of wind power, the kinetic energy is transmitted to the wind driven generator (913) through the gear wheel machine (912), the wind driven generator (913) obtains corresponding rotating speed to generate alternating current, the alternating current is converted into direct current meeting grid connection requirements through the AC/DC converter (914), and the direct current is connected to the traction direct current bus II (52); the integrated controller (94) controls an AC/DC converter (914).
5. The control method for the new energy power supply system of the urban rail traction network is characterized in that the photovoltaic power generation device (92) comprises a photovoltaic module (921) and a DC/DC converter (922), wherein the DC/DC converter (922) is used for converting the voltage of the power generated by the photovoltaic module (921) into a traction direct current bus II (52); the integrated controller (94) controls the DC/DC converter (922).
6. The control method of the new energy power supply system for the urban rail traction network according to claim 3, characterized in that the energy storage device (93) comprises an energy storage unit (931) and an energy storage DC/DC converter (932), and the energy storage unit (931) is merged into the traction direct current bus II (52) through the energy storage DC/DC converter (932); the integrated controller (94) controls an energy storage DC/DC converter (932).
7. The control method of the new energy power supply system for the urban rail traction network according to claim 1, characterized in that the traction network comprises a contact network (6) and a steel rail (7), and the locomotive is arranged between the contact network (6) and the steel rail (7); and positive buses of the traction direct current bus I (51) and the traction direct current bus II (52) are connected with a contact net (6), and negative buses of the traction direct current bus I (51) and the traction direct current bus II (52) are connected with a steel rail (7).
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