CN113492732B - AT traction network distributed power generation and supply system and control method - Google Patents
AT traction network distributed power generation and supply system and control method Download PDFInfo
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Abstract
The invention provides an AT traction network distributed power generation and supply system and a control method, and belongs to the technical field of traction power supply of electrified railways. The traction side of the in-phase traction substation is connected with a traction bus, the traction bus is connected with an AT traction network through a feeder line, a power generation device arranged in a corridor along a railway is connected into a traction power supply system in a distributed mode through an AT switching station along the railway, and a central coordination controller arranged in the traction substation controls the operation mode of the power generation device and performs power generation and reactive power distribution control; the method is mainly used for further prolonging the power supply distance of the in-phase AT traction network, realizing distributed access and nearby consumption of new energy, and promoting green development of a railway system.
Description
Technical Field
The invention relates to the technical field of alternating current electrified railway power supply, in particular to an AT traction network distributed power generation and supply system and a control method.
Background
A large number of successful application cases of new energy and renewable energy power generation in a power system exist, and a railway system is also under initial exploration. New energy and renewable energy are popularized and applied to power generation along the railway according to principles of local conditions, multi-energy complementation and the like.
The electric phase separation of the traction power supply system forms a dead zone, which causes power supply interruption and is a bottleneck restricting the development of the electrified railway, and the implementation of long-distance in-phase power supply can reduce or even cancel the electric phase separation and eliminate the dead zone. Especially for difficult zones with weak external power supply and limited geographic conditions, such as Sichuan-Tibet railway, the long-distance in-phase power supply can span the difficult zones, and the traction power supply problem is solved.
At present, the proposed scheme of accessing new energy and renewable energy to an electrified railway is to concentrate on one power generation, or one power generation nearby, or one power generation far away from a traction substation, and then access a traction bus in the traction substation in a centralized manner, so that the problems of new energy and renewable energy consumption and traction load peak load.
A distributed new energy and renewable energy power generation system is connected to a traction network, and a complex connection structure and a control method are involved. When new energy power generation power and traction station power exist at the same time, how to control and use the new energy power generation power and the traction station power so as to meet the requirement of new energy consumption nearby, reduce the phenomena of wind abandonment and light abandonment, improve the new energy power generation utilization rate, and solve the problem urgently after the new energy power generation system is connected to the grid.
Chinese patent application No.: 202110028103.9 discloses a grid-connected system for in-phase traction power supply and remote power generation and a control method thereof, which relates to a power generation system, and is far away from a traction substation, and the power generation system is connected to the traction substation through a power supply line, so as to be popularized to a plurality of remote power generation grid-connected systems, the power generation system is represented as a radial structure taking the traction substation as the center, and each power generation system needs to be connected to the traction substation through a respective power supply line. The railway is linearly distributed, so that the power supply line is unnecessarily long and wasted. The invention relates to a power generation system of a railway, which is characterized in that new energy sources such as wind and light and renewable energy sources are installed in a corridor along the railway, the power generation system utilizes a linear distribution corridor along the railway to generate power by the new energy sources such as wind and light and the renewable energy sources, solves the technical problems that power generation devices such as distributed and independent new energy sources and renewable energy sources are connected into an AT traction network to perform power generation control and reactive power control, utilizes the voltage support of the traction network, prolongs the power supply distance through in-phase power supply, improves the utilization of the renewable electric energy of a train, increases the power supply of the new energy sources and the renewable energy sources to traction loads, and reduces the phenomena of wind and light abandonment of the new energy sources and the renewable energy sources.
Disclosure of Invention
The invention aims to provide an AT traction network distributed power generation and supply system which can effectively solve the technical problem that a distributed power generation device along a railway is directly connected to a traction network in a grid-connected mode to participate in traction power supply and carry out capacity distribution and control.
The purpose of the invention is realized by the following technical scheme:
an AT traction network distributed power generation and supply system comprises an AT traction network and an in-phase traction substation TS connected with the AT traction network, wherein a traction bus TBT of the in-phase traction substation TS is connected with a contact net T line of the AT traction network through a feeder FP, a traction bus TBF of the in-phase traction substation TS is connected with a contact net F line of the AT traction network through a feeder FN, the traction bus TBT is provided with a voltage transformer PTT, the traction bus TBF is provided with a voltage transformer PTF, the feeder FP is provided with a current transformer CT, the AT traction network is provided with an AT switching station, a neutral point of the AT switching station is connected with a steel rail R, and the system also comprises a power generation device arranged along the railway trend, and the power generation device is connected into the AT traction network through the AT switching station; the in-phase traction substation TS is provided with a central coordination controller CCC, a measurement and control end of the central coordination controller CCC is connected with a measurement and control end of a power generation device through an optical fiber pair, and measurement ends of a voltage transformer PTT and a PTF and a current transformer CT are connected with an input end of the central coordination controller CCC.
The number of the AT switching stations is n, specifically, the number of the AT switching stations is recorded as AT switching station AT1, AT switching stations AT2, …, AT switching stations ATi, … and AT switching stations ATn, n is more than or equal to 1, i =1,2,3, …, n; the contact net T line AT the outlet of the AT switching station ATi is connected in series into a sectionalizer SETi to sectionalize the contact net T line, and the contact net F line AT the outlet of the AT switching station ATi is connected in series into a sectionalizer SEFi to sectionalize the contact net F line.
The number of the power generation devices is n, and the power generation devices are specifically marked as power generation devices ATG1, power generation devices ATG2, …, power generation devices ATGi, … and power generation devices ATGn; wherein n is more than or equal to 1, i =1,2,3, …, n; the voltage of the sectional bus of the AT switching station provides a supporting voltage for the power generation device ATG; the power generation device ATGi is connected with the sectional bus TBSi of the switching station ATi through a connecting line SPTi, and the power generation device ATGi is connected with the sectional bus FBSi of the switching station ATi through a connecting line SPfi; two sides of a segmenter SETi are respectively connected to a segment bus TBSi through an upper network line LT1i and an upper network line LT2i, two sides of a segmenter SEFi are respectively connected to a segment bus FBSi through an upper network line LF1i and an upper network line LF2i, and a voltage transformer PTi is further arranged between the segment bus TBSi and the segment bus FBSi; the measurement and control ends of the CCC are respectively connected with the measurement and control ends of the power generation devices ATG1, the power generation devices ATG2, …, the power generation devices ATGi, … and the power generation devices ATGn through the optical fiber pairs sA1, sA2, …, sA, … and sAn, and the measurement and control ends of the voltage transformer PT1, the voltage transformers PT2, …, the voltage transformers PTi, … and the voltage transformer PTn are respectively connected with the input end of the CCC through the optical fibers s1, s2, …, the optical fibers si, … and the optical fiber sn.
The power generation device ATGi comprises a matching transformer MTi, an AC-DC conversion device GCi and a new energy power generation device GNEi; the number of the new energy power generation devices GNEi is h, h is more than or equal to 1, and the new energy power generation devices GNEi1, GNEi2 and … and GNEih are recorded specifically; the direct current sides of the new energy power generation device GNEi1, the new energy power generation devices GNEi2, … and the new energy power generation device GNEih are connected in parallel through a direct current bus DCBi and then are connected with a direct current port of an alternating current-direct current conversion device GCi; the secondary winding of the matching transformer MTi is connected with an alternating current port of the alternating current-direct current conversion device GCi, one end of the primary winding of the matching transformer MTi is connected to a connecting line SPTi, and the other end of the primary winding of the matching transformer MTi is connected to a connecting line SPFi, wherein a measurement and control end of the central coordination controller CCC is specifically connected with a measurement and control end of the alternating current-direct current conversion device GCi and measurement and control ends of the h new energy power generation devices GNEi through an optical fiber pair sAi.
The ac-dc converter GCi exists as a reactive generator when used alone.
The installation capacities of the power generation devices ATG1, ATG2, …, ATGi, … and ATGn are respectively corresponding to S1, S2, …, Si, … and Sn, the maximum active power generation amount is respectively corresponding to E1, E2, …, Ei, … and En, the maximum reactive power compensation amount is respectively Q1, Q2, …, Qi, … and Qn, and the requirements are that:
。
the new energy power generation device GNEi is one or more of a photovoltaic power generation device, a photo-thermal power generation device, a hydrogen energy power generation device, a wind power generation device and a biochemical energy power generation device.
The invention also aims to provide a control method based on the traction network power supply and power generation system, which can effectively solve the technical problems of controlling the distributed new energy power generation device to be connected with a traction network and supporting the voltage of the traction network.
The purpose of the invention is realized by the following technical scheme:
a control method of an AT traction network distributed power generation and supply system comprises the following steps: the central coordination controller CCC calculates a total installation capacity S of the power generation devices based on the installation capacities S1, S2, …, Si, …, and Sn of the power generation devices ATG1, ATG2, …, ATGi, …, and ATGn of the power generation devices connected to the traction network AT the AT switching station installed in the traction network,
(ii) a The CCC measures the real-time total power of a traction network containing n power generation devices through a voltage transformer PT and a current transformer CT, and distinguishes the power utilization state and the power generation state; determining the total active power generation amount E of the n power generation devices according to the instant total power of the traction network containing the n power generation devices and the total installation capacity S of the power generation devices, wherein the E is less than or equal to S; the central coordination controller CCC controls the active power generation amount generated by the power generation device ATGi to be Ei, Ei = E × Si/S.
The central coordination controller CCC obtains the voltage UPi of the AT switching station ATi through a voltage transformer PTi; the central coordination controller CCC controls the power generation device ATGi to send out reactive compensation amount Qi according to the voltage UPi, the absolute value | Qi | of the reactive compensation amount Qi is less than or equal to Qi, and the reactive compensation amount Qi compensates the power factor of the traction network and the network voltage of the AT switching station.
The CCC has the function of judging whether the power generation device has a fault or does not have a power generation condition, and when the power generation device has the fault or does not have the power generation condition, the CCC controls the power generation device to quit the operation; among the power generation devices ATG1, ATG2, …, ATGi, …, ATGn, p power generation devices have a fault or no power generation condition, and are collectively referred to as a fault power generation device ATGk1, a fault power generation device ATGk2, …, a fault power generation device ATGkz, …, and a fault workRate generating means ATGkp (kz ∈ {1,2,3, …, n }); p is more than or equal to 1 and less than or equal to n; z =1,2,3, …, p; i =1,2,3, …, n; i is not equal to kz; the total installation capacity Sa of the power generation devices that have not exited the operation is calculated,
；
the CCC measures the real-time total power of a traction network containing n-p power generation devices through a voltage transformer PT and a current transformer CT, and distinguishes the power utilization state and the power generation state again; the CCC determines the total active power generation amount Ea of the power generation devices which do not quit operation according to the instant total power of the traction network containing the n-p power generation devices and the total installation capacity Sa of the power generation devices, wherein Ea is less than or equal to Sa; and controlling the active power generation amount generated by the power generation device ATGi to be Eai, Eai = Ea Si/Sa;
when the power generation device has a fault or does not have a power generation condition, then: acquiring the voltage UPai of the switching station ATi corresponding to the power generation device ATGi which does not exit the operation again through the voltage transformer PTi; controlling a power generation device ATGi to send out reactive compensation qai according to the voltage UPai, wherein the absolute value | qai | is not more than Qi, and compensating the power factor of the traction network and the network voltage of an AT switching station AT the moment; the power generation device ATGi of the AT traction network distributed power generation and supply system can independently control the active power generation amount or the reactive compensation amount, or simultaneously control the active power generation amount and the reactive compensation amount.
The working principle of the invention is as follows: the characteristics of new energy and renewable energy distribution along a corridor along a railway are combined, an AT switching station arranged along a traction network is utilized, a plurality of power generation devices are connected into the traction network in a distributed mode, the active power and the reactive power of the power generation devices are distributed and controlled by detecting the superposed power of the power generation devices and an electric locomotive, the direct power supply of the new energy and the renewable energy to a traction load is realized, the voltage of the traction network is supported in real time, the power supply distance is prolonged, and the renewable electric energy utilization rate of a train and the power generation utilization rate of the new energy and the renewable energy are improved.
Compared with the prior art, the invention has the beneficial effects that:
the new energy and the renewable energy can be accessed to a traction network in a distributed manner, so that the new energy and the renewable energy along the railway can be directly merged into the traction network to participate in traction power supply, and a new energy and renewable energy power generation system does not need to be accessed to a traction substation through respective power supply lines;
secondly, the voltage of a traction network along the railway is supported in real time, and good power supply conditions are provided for train passing;
and thirdly, the power supply distance is prolonged, the utilization rate of new energy and renewable energy is improved while the utilization rate of the renewable electric energy of the train is improved, and the phenomena of wind and light abandonment are reduced.
Drawings
FIG. 1 is a schematic view of the structure of the present invention.
Fig. 2 is a schematic structural diagram of a power generation device according to the present invention.
FIG. 3 is a flow chart of a control method according to the present invention.
Detailed Description
In order to make the technical solutions of the present invention better understood, those skilled in the art will further describe the present invention with reference to the accompanying drawings and the detailed description.
Example 1
As shown in fig. 1, this embodiment provides a distributed power generation and supply system for an AT traction network, which includes an AT traction network and an in-phase traction substation TS connected to the AT traction network, where a traction bus TBT of the in-phase traction substation TS is connected to a contact network T line of the AT traction network through a feeder FP, the traction bus TBF of the in-phase traction substation TS is connected to a contact network F line of the AT traction network through a feeder FN, the traction bus TBT is provided with a voltage transformer PTT, the traction bus TBF is provided with a voltage transformer PTF, the feeder FP is provided with a current transformer CT, the AT traction network is provided with an AT switching station, a neutral point of the AT switching station is connected to a steel rail R, and the distributed power generation device is connected to the AT traction network through the AT switching station;
the in-phase traction substation TS is provided with a central coordination controller CCC, a measurement and control end of the central coordination controller CCC is connected with a measurement and control end of a power generation device through an optical fiber pair, and measurement ends of a voltage transformer PTT and a voltage transformer PTF and a measurement end of a current transformer CT are connected with an input end of the central coordination controller CCC.
In this embodiment, the in-phase traction substation is adopted to cancel the electric phase separation AT the outlet of the substation to realize in-phase power supply (the specific scheme of the in-phase traction substation can refer to patent application documents or non-patent documents related to the in-phase power supply), because the power supply distance of the traction network is increased after the electric phase separation is cancelled, in order to increase the power supply reliability, the AT switching station is arranged in this embodiment, the new energy power generation system in this embodiment is connected to the traction network through the AT switching station in a distributed manner, on one hand, the new energy power generation system can be consumed nearby, the green development of a railway system is promoted, on the other hand, the problem of line loss caused by long-distance transmission to the substation in the scheme of connecting the traction network through the substation in a centralized manner can also be avoided, and therefore the utilization efficiency of new energy is improved.
Preferably, the number of the AT switching stations is n, and specifically, the number is denoted as AT switching station AT1, AT switching stations AT2, …, AT switching stations ATi, …, and AT switching station ATn; a contact net T line AT an outlet of the AT switching station ATi is connected in series into a sectionalizer SETi, the contact net T line is sectioned, a contact net F line AT an outlet of the AT switching station ATi is connected in series into a sectionalizer SEFi, the contact net F line is sectioned, and a train passes through without power failure; two sides of the segmenter SETi are connected to a segment bus TBSi through an upper network line LT1i and an upper network line LT2i respectively, two sides of the segmenter SEFi are connected to the segment bus FBSi through an upper network line LF1i and an upper network line LF2i respectively, wherein n is larger than or equal to 1, i =1,2,3, …, n, and the voltage of the segment bus of the AT switching station provides a supporting voltage for the power generation device.
In the embodiment, the AT switch is arranged on the line, so that the reliability and flexibility of power supply are ensured, the power failure range is reduced, the switch of the switching station is in a connected state under the normal operation condition, and the switch of the switching station is in a disconnected state only under the working conditions of failure, maintenance and the like; the AT switching station is different from a subarea station provided with an electric phase splitter, and the subarea station is a facility for dividing a traction network into different power supply subareas, and one subarea station is generally arranged AT a power supply boundary of two adjacent traction substations. When a certain traction substation loses power due to faults, the switch of the subarea substation can be closed to carry out cross-zone power supply, and under the condition of normal operation, the switch of the subarea substation is in an off state. In addition, in the multi-line section, the parallel operation can be carried out at the tail ends of the uplink and the downlink lines implemented by the subareas.
Preferably, the number of the power generation devices is n, n is equal to or greater than 1, i =1,2,3, …, n, specifically, power generation devices ATG1, ATG2, …, ATGi, …, ATGn; the power generation device ATGi is connected with a sectional bus TBSi of the switching station ATi through a connecting line SPTi, and the power generation device ATGi is connected with a sectional bus FBSi of the switching station ATi through a connecting line SPfi; a voltage transformer PTi is also arranged between the segmented bus TBSi and the FBSi; the measurement and control ends of the CCC are respectively connected with the measurement and control ends of the power generation devices ATG1, the power generation devices ATG2, …, the power generation devices ATGi, … and the power generation device ATGn through an optical fiber pair sA1, an optical fiber pair sA2, an optical fiber pair …, an optical fiber pair sAi, an optical fiber pair … and an optical fiber pair sAn, and the measurement and control ends of the voltage transformer PT1, the voltage transformers PT2, …, the voltage transformers PTi, … and the voltage transformer PTn are respectively connected with the input end of the CCC through an optical fiber s1, optical fibers s2, …, optical fibers si, … and an optical fiber sn.
When the power generation device is implemented, the power generation device is connected to the AT switching station, so that energy loss and implementation difficulty caused by too long lead-in line are avoided.
Preferably, the installation capacities of the power generation devices ATG1, ATG2, …, ATGi, … and ATGn are S1, S2, …, Si, … and Sn, the maximum active power generation amounts are E1, E2, …, Ei, … and En, the maximum reactive power compensation amounts are Q1, Q2, …, Qi, … and Qn, and satisfy:
。
preferably, in the case of a multi-track railway, the upstream and downstream catenary T and catenary F lines are connected in parallel by the bus TBSi and FBSi of the AT switching station ATi. In the example mode, the uplink traction network and the downlink traction network are connected in parallel, so that the voltage loss and the electric energy loss of the traction network are minimum, and the voltage level of a power grid is favorably improved; the AT switching station provides guarantee for reliable power supply and sectional protection of the traction network.
When the power supply system is implemented, the power supply distance is prolonged through the in-phase traction substation TS, the utilization rate of the regenerated electric energy of the train is improved, meanwhile, the power supply of new energy and renewable energy to a traction load is increased, the utilization rate of the new energy and the renewable energy is improved, and the phenomena of wind abandonment, light abandonment and the like of wind and light new energy and renewable energy are reduced. It should also be noted that the setting of the in-phase traction substation TS is reasonably selected according to the external power supply condition, and if the external power supply has a large short-circuit capacity, the power quality requirement can be met by adopting single-phase in-phase power supply; if the short-circuit capacity of the external power supply is small, and the single-phase in-phase power supply cannot meet the requirement of the power quality, the combined type in-phase power supply can be adopted, the power quality is compensated to be within the national standard range, the single-combined type in-phase power supply is recommended, and the single-combined type three-combined type in-phase power supply can be considered when the existing conditions are utilized.
As shown in fig. 2, a power generation device of an AT traction network distributed generation and power supply system, the power generation device ATGi includes a matching transformer MTi, an ac-dc conversion device GCi, and a new energy power generation device GNEi; the number of the new energy power generation devices GNEi is h, h is more than or equal to 1, and the new energy power generation devices GNEi1, GNEi2 and … and GNEih are recorded specifically; the direct current sides of the new energy power generation device GNEi1, the new energy power generation devices GNEi2, … and the new energy power generation device GNEih are connected in parallel through a direct current bus DCBi and then are connected with a direct current port of an alternating current-direct current conversion device GCi; the secondary winding of the matching transformer MTi is connected with an alternating current port of the alternating current-direct current conversion device GCi, one end of the primary winding of the matching transformer MTi is connected to a connecting line SPTi, the other end of the primary winding of the matching transformer MTi is connected to a connecting line SPFi, n is more than or equal to 1, i =1,2,3, …, n, and a measurement and control end of the CCC is specifically and respectively connected with a measurement and control end of the alternating current-direct current conversion device GCi and measurement and control ends of the h new energy power generation devices GNEi through an optical fiber pair sAi.
Preferably, the ac-dc converter GCi is a reactive generator when used alone.
Preferably, the new energy power generation device GNEi is one or more of a photovoltaic power generation device, a photo-thermal power generation device, a hydrogen power generation device, a wind power generation device and a biochemical energy power generation device.
When the energy storage device is implemented, the energy storage device can be selectively arranged according to different requirements of an electric power department on a traction power supply system. The energy storage device can be one or more of water electrolysis hydrogen production energy storage, super capacitor energy storage, flywheel energy storage, flow battery energy storage and lithium battery energy storage. If the electric power department allows the rest of the traction power supply system to surf the internet, the energy storage device is not arranged; and if the electric power department limits the residual electricity of the traction power supply system to be on line, arranging an energy storage device on a traction bus TBT of the same-phase traction substation TS. The energy storage device is favorable for improving the utilization rate of new energy and renewable energy, and meanwhile, the traction load can be used for peak clipping and valley filling, so that the basic electricity charge is reduced.
Example 2
As shown in fig. 3, this embodiment provides a control method for an AT traction grid distributed power generation and supply system provided in embodiment 1, which is applied to a central coordination controller CCC and implemented by the following technical solutions:
the method comprises the following steps:
the central coordination controller CCC calculates a total installation capacity S of the power generation devices based on the installation capacities S1, S2, …, Si, …, and Sn of the power generation devices ATG1, ATG2, …, ATGi, …, and ATGn of the power generation devices connected to the traction network AT the AT switching station installed in the traction network,
；
the CCC measures the real-time total power of a traction network containing n power generation devices through a voltage transformer PT and a current transformer CT, and distinguishes the power utilization state and the power generation state;
the train running on the line has three running conditions: traction, regeneration and coasting. Traction is equivalent to electricity utilization, regeneration is equivalent to power generation, and the regenerated train can provide electric energy for the traction train. When the sum of the generated energy of all the new energy power generation devices of the traction network and the regenerated energy of the train is less than the sum of the traction energy of the train, the instantaneous total power of the traction network measured by a voltage transformer PT and a current transformer CT is more than 0 and is recorded as a power utilization state; when the sum of the generated energy of all the new energy power generation devices of the traction network and the regenerated energy of the train is greater than the sum of the traction energy of the train, the instant total power of the traction network is less than 0 and is recorded as a power generation state. The power generation state may be generated by a regenerative train or a new energy power generation device.
The CCC determines the total active power generation amount E of the n power generation devices according to the instant total power of the traction network containing the n power generation devices and the total installation capacity S of the power generation devices, wherein the E is less than or equal to S;
the central coordination controller CCC controls the active power generation amount generated by the power generation device ATGi to be Ei, Ei = E × Si/S.
Preferably, the voltage UPi of the switching station ATi is acquired by a voltage transformer PTi;
the central coordination controller CCC controls the power generation device SGi to send out reactive compensation amount Qi according to the voltage UPi, and the absolute value | Qi | of the reactive compensation amount Qi is less than or equal to Qi, so that power factors of a traction network and network voltage of an AT switching station are compensated.
It should be noted that the total active power generation amount E can be adjusted according to different requirements of the power department on the traction power supply system. If the electric power department allows the residual electricity of the traction power supply system to be on line, the total active power generation amount E is improved, and the power generation device is controlled to generate power according to the maximum power; and if the electric power department limits the rest power of the traction power supply system to be on line, adjusting the total active power generation amount E, and controlling the generation (regeneration) power of the instant total power of the traction network at the moment to be within the allowable range of the electric power department. In addition, the control of the reactive compensation amount qi is globally optimized according to the voltage UPi, and the power generation device is controlled to send out the global reactive compensation amount qi meeting the requirement of the voltage UPi.
Preferably, the central coordination controller CCC has a function of determining whether the power generator has a fault or does not have a power generation condition, and controls the power generator to stop operating when the power generator has a fault or does not have a power generation condition, wherein the power generator ATG1, the power generator ATG2, …, the power generator ATGi, …, or the power generator ATGn includesThe p power generation devices have faults or do not have power generation conditions, and are collectively recorded as fault power generation devices ATGk1, fault power generation devices ATGk2 and …, fault power generation devices ATGkz and … and fault power generation devices ATGkp (kz belongs to {1,2,3, …, n }); p is more than or equal to 1 and less than or equal to n; z =1,2,3, …, p; i =1,2,3, …, n; i is not equal to kz; the central coordination controller CCC calculates the total installation capacity Sa of the power generation devices that have not exited operation,
(ii) a The CCC measures the real-time total power of a traction network containing n-p fault power generation devices through a voltage transformer PT and a current transformer CT, and distinguishes a power utilization state and a power generation state;
the CCC determines the total active power generation amount Ea of the power generation device which does not quit operation according to the instant total power of the traction network containing the n-p fault power generation devices and the total installation capacity Sa of the power generation devices, wherein Ea is less than or equal to Sa; and controlling the active power generation amount generated by the power generation device ATGi to be Eai, Eai = Ea Si/Sa;
preferably, when the power generation device has a fault or does not have a power generation condition, then: the central coordination controller CCC acquires the voltage UPai of the switching station ATi corresponding to the power generation device ATGi which does not exit the operation again through the voltage transformer PTi;
and controlling a power generation device ATGi to send out reactive compensation qai according to the voltage UPai, wherein the absolute value | qai | of the reactive compensation qai is not more than Qi, and the reactive compensation qai compensates the power factor of the traction network and the network voltage of the AT switching station.
It should be noted that the total active power generation amount Ea can be adjusted according to different requirements of the power department on the traction power supply system. If the electric power department allows the residual electricity of the traction power supply system to be on line, the total active power generation amount Ea is improved, and the power generation device with the power generation condition is controlled to generate power according to the maximum power; and if the electric power department limits the residual electricity of the traction power supply system to be on line, adjusting the total active power generation amount Ea, and controlling the power generation (regeneration) power of the instant total power of the traction network at the moment to be within the allowable range of the electric power department. In addition, the control of the reactive compensation amount qai is globally optimized according to the voltage UPai, and the power generation device with the power generation condition is controlled to generate the global reactive compensation amount qai meeting the requirement of the voltage UPai.
Preferably, the power generation apparatus ATGi is capable of controlling the active power generation amount or the reactive compensation amount individually or simultaneously.
The above is only a preferred embodiment of the present invention, and it should be noted that the above preferred embodiment should not be considered as limiting the present invention, and the protection scope of the present invention should be subject to the scope defined by the claims. It will be apparent to those skilled in the art that various modifications and adaptations can be made without departing from the spirit and scope of the invention, and these modifications and adaptations should be considered within the scope of the invention.
Claims (9)
1. The utility model provides a AT pulls net distributing type electricity generation power supply system, pull the net including the AT and pull the cophase that the net is connected with the AT and pull electric substation TS, cophase pulls the generating line TBT of electric substation TS and pulls the contact net T line of net through feeder FP and AT and link to each other, cophase pulls the generating line TBF of electric substation TS and pulls the contact net F line of net through feeder FN and AT and link to each other, it is equipped with voltage transformer PTT to pull the generating line TBT, it establishes voltage transformer PTF to pull the generating line TBF, feeder FP is equipped with current transformer CT, its characterized in that: the AT traction network is provided with an AT switching station, the neutral point of the AT switching station is connected with the steel rail R, and the AT traction network further comprises a power generation device arranged along the direction of the railway, and the power generation device is connected to the AT traction network through the AT switching station; the number of the AT switching stations is n, and is specifically recorded as AT switching stations AT1, AT switching stations AT2, …, AT switching stations ATi, … and AT switching stations ATn, wherein n is more than or equal to 1, i =1,2,3, …, n; a contact net T line AT an outlet of the AT switching station ATi is connected in series into a sectionalizer SETi, the contact net T line is sectioned, a contact net F line AT an outlet of the AT switching station ATi is connected in series into a sectionalizer SEFi, and the contact net F line is sectioned; the in-phase traction substation TS is provided with a central coordination controller CCC, a measurement and control end of the central coordination controller CCC is connected with a measurement and control end of a power generation device through an optical fiber pair, and measurement ends of a voltage transformer PTT and a PTF and a current transformer CT are connected with an input end of the central coordination controller CCC.
2. The AT traction network distributed power generation and supply system according to claim 1, characterized in that: the number of the power generation devices is n, and the power generation devices are specifically marked as power generation devices ATG1, power generation devices ATG2, …, power generation devices ATGi, … and power generation devices ATGn, wherein n is more than or equal to 1, i =1,2,3, …, n; the voltage of the sectional bus of the AT switching station provides a supporting voltage for the power generation device; the power generation device ATGi is connected with the sectional bus TBSi of the switching station ATi through a connecting line SPTi, and the power generation device ATGi is connected with the sectional bus FBSi of the switching station ATi through a connecting line SPfi; two sides of a segmenter SETi are respectively connected to a segment bus TBSi through an upper network line LT1i and an upper network line LT2i, two sides of a segmenter SEFi are respectively connected to a segment bus FBSi through an upper network line LF1i and an upper network line LF2i, and a voltage transformer PTi is further arranged between the segment bus TBSi and the segment bus FBSi; the measurement and control ends of the CCC are respectively connected with the measurement and control ends of the power generation devices ATG1, the power generation devices ATG2, …, the power generation devices ATGi, … and the power generation devices ATGn through the optical fiber pairs sA1, sA2, …, sA, … and sAn, and the measurement and control ends of the voltage transformer PT1, the voltage transformers PT2, …, the voltage transformers PTi, … and the voltage transformer PTn are respectively connected with the input end of the CCC through the optical fibers s1, s2, …, the optical fibers si, … and the optical fiber sn.
3. The AT traction network distributed power generation and supply system according to claim 2, characterized in that: the power generation device ATGi comprises a matching transformer MTi, an AC-DC conversion device GCi and a new energy power generation device GNEi; the number of the new energy power generation devices GNEi is h, h is more than or equal to 1, and the new energy power generation devices GNEi1, GNEi2, GNEi3 and … and GNEih are recorded specifically; the direct current sides of the new energy power generation device GNEi1, the new energy power generation devices GNEi2, … and the new energy power generation device GNEih are connected in parallel through a direct current bus DCBi and then are connected with a direct current port of an alternating current-direct current conversion device GCi; the secondary winding of the matching transformer MTi is connected with an alternating current port of the alternating current-direct current conversion device GCi, one end of the primary winding of the matching transformer MTi is connected to a connecting line SPTi, and the other end of the primary winding of the matching transformer MTi is connected to a connecting line SPFi, wherein a measurement and control end of the central coordination controller CCC is specifically connected with a measurement and control end of the alternating current-direct current conversion device GCi and measurement and control ends of the h new energy power generation devices GNEi through an optical fiber pair sAi.
4. The AT traction network distributed power generation and supply system according to claim 3, wherein: the ac-dc converter GCi exists as a reactive generator when used alone.
5. The AT traction network distributed power generation and supply system according to claim 3, wherein: the installation capacities of the power generation devices ATG1, ATG2, …, ATGi, … and ATGn are respectively corresponding to S1, S2, …, Si, … and Sn, the maximum active power generation amount is respectively corresponding to E1, E2, …, Ei, … and En, the maximum reactive power compensation amount is respectively Q1, Q2, …, Qi, … and Qn, and the requirements are that:
。
6. the AT traction network distributed power generation and supply system according to claim 3, wherein: the new energy power generation device GNEi is one or more of a photovoltaic power generation device, a photo-thermal power generation device, a hydrogen energy power generation device, a wind power generation device and a biochemical energy power generation device.
7. A control method of an AT traction network distributed power generation and supply system comprises the following steps:
the central coordination controller CCC calculates a total installation capacity S of the power generation devices based on the installation capacities S1, S2, …, Si, …, and Sn of the power generation devices ATG1, ATG2, …, ATGi, …, and ATGn of the power generation devices connected to the traction network AT the AT switching station installed in the traction network,
(ii) a The CCC measures the real-time total power of a traction network containing n power generation devices through a voltage transformer PT and a current transformer CT, and distinguishes the power utilization state and the power generation state; determining the total active power generation amount E of the n power generation devices according to the instant total power of the traction network containing the n power generation devices and the total installation capacity S of the power generation devices, wherein the E is less than or equal to S; the central coordination controller CCC controls the active power generation amount generated by the power generation device ATGi to be Ei, Ei = E × Si/S.
8. The control method of the AT traction network distributed power generation and supply system according to claim 7, characterized in that: the central coordination controller CCC obtains the voltage UPi of the AT switching station ATi through a voltage transformer PTi; the central coordination controller CCC controls the power generation device ATGi to send out reactive compensation amount Qi according to the voltage UPi, the absolute value | Qi | of the reactive compensation amount Qi is less than or equal to Qi, and the reactive compensation amount Qi compensates the power factor of the traction network and the network voltage of the AT switching station.
9. The control method of the AT traction network distributed power generation and supply system according to claim 8, characterized in that: the CCC has the function of judging whether the power generation device has a fault or does not have a power generation condition, and when the power generation device has the fault or does not have the power generation condition, the CCC controls the power generation device to quit the operation; among the power generation devices ATG1, ATG2, …, ATGi, …, ATGn, there are p power generation device failures or no power generation conditions, and they are collectively referred to as a failure power generation device ATGk1, a failure power generation device ATGk2, …, a failure power generation device ATGkz, …, a failure power generation device ATGkp (kz ∈ {1,2,3, …, n }); p is more than or equal to 1 and less than or equal to n; z =1,2,3, …, p; i =1,2,3, …, n; i is not equal to kz; the total installation capacity Sa of the power generation devices that have not exited the operation is calculated,
；
the CCC measures the real-time total power of a traction network containing n-p power generation devices through a voltage transformer PT and a current transformer CT, and distinguishes the power utilization state and the power generation state again; the CCC determines the total active power generation amount Ea of the power generation devices which do not quit operation according to the instant total power of the traction network containing the n-p power generation devices and the total installation capacity Sa of the power generation devices, wherein Ea is less than or equal to Sa; and controlling the active power generation amount generated by the power generation device ATGi to be Eai, Eai = Ea Si/Sa;
when the power generation device has a fault or does not have a power generation condition, then: acquiring the voltage UPai of the switching station ATi corresponding to the power generation device ATGi which does not exit the operation again through the voltage transformer PTi; controlling a power generation device ATGi to send out reactive compensation qai according to the voltage UPai, wherein the absolute value | qai | is not more than Qi, and compensating the power factor of the traction network and the network voltage of an AT switching station AT the moment; the power generation device ATGi of the AT traction network distributed power generation and supply system can independently control the active power generation amount or the reactive compensation amount, or simultaneously control the active power generation amount and the reactive compensation amount.
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