CN114336643B - System for utilizing passing power of bilateral power supply traction network of regional station and control method - Google Patents
System for utilizing passing power of bilateral power supply traction network of regional station and control method Download PDFInfo
- Publication number
- CN114336643B CN114336643B CN202210261897.8A CN202210261897A CN114336643B CN 114336643 B CN114336643 B CN 114336643B CN 202210261897 A CN202210261897 A CN 202210261897A CN 114336643 B CN114336643 B CN 114336643B
- Authority
- CN
- China
- Prior art keywords
- traction
- power
- substation
- tsa
- tsb
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Landscapes
- Supply And Distribution Of Alternating Current (AREA)
Abstract
The invention provides a system for utilizing the passing power of a bilateral power supply traction network of a subarea station and a control method, and relates to the field of circuit design of traction power supply systems. The OCS is used for carrying out bilateral power supply by two adjacent traction substations TSa and TSb, a traversing power utilization device SES and a central controller CC are arranged in a partition between the traction substations TSa and TSb, the central controller CC obtains information of traction bus voltage and traction feeder current amount of the traction substations TSa and TSb in real time, and controls the traversing power utilization device SES to utilize traversing power of the OCS so as to enable the traversing power returned to the power grid to meet preset requirements. The invention utilizes the passing power of the traction network without changing the railway power supply structure of the power grid, eliminates the negative influence caused by the passing power measurement and fully exerts the advantage of bilateral power supply.
Description
Technical Field
The invention relates to the field of traction power supply system circuit design, in particular to a system for utilizing the passing power of a bilateral power supply traction network of a subarea station and a control method.
Background
The electric split phase of the electrified railway is a weak link in the whole traction power supply system, a neutral section of the electric split phase forms a dead zone, so that power supply interruption is caused, although the dead zone of the neutral section is only dozens of meters generally, the power-off distance of the train for controlling the automatic passing split phase reaches more than 500 meters, the good running of the train is severely restricted, and even the accident of train slope stop is caused when the train goes up a slope. The bilateral power supply of the electrified railway can cancel the electric phase separation of the subareas, eliminate the dead zones, ensure the uninterrupted power supply of the train and eliminate the potential danger of passing the neutral zone. The bilateral power supply has the advantages of high power supply reliability, good network voltage level, high power supply capacity, low power loss and the like.
Normally, the bilateral power supply traction network and the power grid form a parallel structure, when the traction network is unloaded, power (current) flows through the traction network, the corresponding power is called through power (the corresponding current is called balanced current), at this time, the through power flows in from the traction substation on one side and flows out from the traction substation on the other side, that is, the traction substation where the through power flows into the traction network from the power grid is in a load (power utilization) state, and the traction substation where the through power flows into the power grid from the traction network is in a power generation state. Just because bilateral power supply changes the grid structure, some key technical problems need to be solved first in the implementation of bilateral power supply, mainly in two aspects: firstly, the relay protection problem of the power grid and the traction network can be completely solved as long as the power grid is provided with power transmission line protection, the traction network is provided with segment protection and the like, secondly, the measurement problem of the crossing power is solved, if the crossing power is returned to the power grid, reverse counting is carried out, namely, the crossing power is treated according to power generation, a user has no economic loss, if the crossing power is returned to the power grid, returning is not counted or is counted positively, the economic loss of the user is caused, under the condition, the research on how the bilateral power supply reduces the crossing power or how the crossing power is utilized is needed, the economic loss is reduced while the advantage of the bilateral power supply is normally exerted, and the power utilization benefit is improved.
Currently, some methods for reducing the through power are proposed. Firstly, the secondary side of a traction transformer of a traction substation is connected with a reactor in series to reduce the balance current, for example, the Chinese patent 1 entitled bilateral power supply system of an electrified railway (No. CN 103552488B), has the defect that the required reactor is large and the power factor of a train needs to be adjusted to be in advance. For example, in the chinese patent 2 "a bilateral power supply method for electrified railway" (No. CN 110126682B), a voltage compensation device is added to the traction substation, and a thyristor 27-level shift is used for adjustment to implement voltage phase compensation and reduce the voltage difference output by the two traction substations with bilateral power supply, and in the chinese patent 3 "an adjustable traction transformer and through power utilization method for flexible through bilateral power supply system" (No. CN 113077979A), the amplitude difference and phase difference between the no-load buses of the two adjacent traction substations tend to zero by adjusting the high-voltage and low-voltage taps of the adjustable transformer. The difficulty of the method lies in the real-time regulation of the voltage of the substation, and the effect of the method directly influences the control effect of the ride-through power. Another implementation method called "quasi-bilateral" power supply is as follows: two power supply arms (a first power supply arm and a second power supply arm) in the same power supply interval of two adjacent traction power transformers are not directly communicated, and power transmission between the two power supply arms is realized by bridging a power exchange device (a single-phase back-to-back converter) at the tail ends of the two power supply arms, so that bilateral power supply is achieved, for example, in Chinese patent 4, a train power supply network and a traction power supply system with quasi-bilateral power supply (publication number: CN 111267675A). Obviously, the power supply mode is not bilateral power supply in the traditional sense, the electric phase separation where the subareas are located cannot be cancelled, and the power of the power exchange device is configured according to the passing capacity of the line train, so that the cost is high. In addition, the power switching device has no overload capability and poor reliability, and the overload capability is often indirectly improved through capacity redundancy. Thus, such "quasi-bilateral" power supply systems lose the natural advantages of bilateral power supply. Chinese patent 5 (publication No. CN 111361463A) discloses a flexible bilateral power supply power flow control system for ac traction network, which adopts the same technical means as chinese patent 4, except that another set of valve set is bridged at the end of the first power supply arm and the second power supply arm, and is connected in parallel with the power exchange device. When the train passes through the junction of the two power supply arms, the valve group inhibits the generation of electric arcs. It can be seen that reducing or eliminating the cross-over power of the dual-side power supply has not been an effective solution.
Disclosure of Invention
In order to solve the above problem, an aspect of the present invention is to provide a system for utilizing crossing power of a bilateral power supply traction network of a partition, where through a crossing power utilization device SES and a central controller CC provided in the partition, the crossing power of an OCS of the bilateral power supply traction network is utilized, so that the crossing power returned to a power grid meets a preset requirement. The invention is realized by the following technical means:
the system comprises a traction network OCS, a traction substation TSa and a traction substation TSb which provide bilateral power supply for the traction network OCS, a subarea substation between the traction substation TSa and the traction substation TSb, a ride-through power utilization device SES arranged in the subarea substation, and a central controller CC; the method comprises the steps that a traction bus voltage transformer PTa, a traction bus incoming line current transformer CTaa and a traction feeder line current transformer CTa are arranged in a traction substation TSa, and a traction bus voltage transformer PTb, a traction bus incoming line current transformer CTbb and a traction feeder line current transformer CTb are arranged in a traction substation TSb; the central controller CC acquires the traction bus and the traction feeder electric quantity information of the traction substation TSa and the traction substation TSb in real time, and controls the ride-through power utilization device SES to utilize the ride-through power of the bilateral power supply traction network OCS, so that the ride-through power returned to the power grid reaches the preset requirement.
Further, the ride-through power utilization device SES comprises an internet access device and an energy storage device ESD;
the internet surfing device comprises an internet surfing line L1, an internet surfing line L2 and an internet surfing bus LB; the upper net bus LB is connected with the two sides of the sectionalizer CSP in the subarea through an upper net line L1 and an upper net line L2;
and the energy storage device ESD is connected with an internet bus LB of the internet access device.
Furthermore, the traction substation TSa and the traction substation TSb both adopt in-phase power supply, and left and right power supply arms of the traction substation TSa and the traction substation TSb are connected through the sectionalizer CSP respectively.
Furthermore, the CC measurement and control end of the central controller is connected with the energy storage device ESD through an optical fiber pair; the measuring ends of the traction bus voltage transformer PTa, the traction bus incoming line current transformer CTaa and the traction feeder line current transformer CTa arranged in the traction substation TSa and the measuring ends of the traction bus voltage transformer PTb, the traction bus incoming line current transformer CTbb and the traction feeder line current transformer CTb arranged in the traction substation TSb are connected with the input end of the central controller CC through optical fiber pairs.
Another aspect of the present invention provides a control method for a bilateral power supply traction network traversing power utilization system based on the above partition, including:
detecting electric quantity information of a traction substation TSa and a traction substation TSb;
calculating power information of the traction substation TSa and the traction substation TSb according to the electric quantity information of the traction substation TSa and the traction substation TSb, wherein the power flowing from the traction substation TSa or the traction substation TSb to the traction network OCS is positive, and the power flowing from the traction network OCS to the traction substation TSa or the traction substation TSb is negative;
according to the power information, the central controller CC controls the ride-through power utilization device SES to utilize the ride-through power of the OCS, so that the ride-through power returned to the power grid meets the preset requirement.
Further, the method comprises:
the central controller CC respectively detects traction bus voltage Ua, traction bus current Ia and traction network feeder line current Ica of the traction substation TSa and traction bus voltage Ub, traction bus current Ib and traction network feeder line current Icb of the traction substation TSb;
the method comprises the following steps of calculating active power Pca and reactive power Qca provided by a traction substation TSa to a traction network according to a traction bus voltage Ua and a traction network feeder current Ica, calculating active power Pcb and reactive power Qcb provided by the traction substation TSb to the traction network according to a traction bus voltage Ub and a traction network feeder current Icb, calculating total active power Pa and total reactive power Qa of the traction substation TSa according to a traction bus voltage Ua and a traction bus current Ia, calculating total active power Pb and total reactive power Qb of the traction substation TSb according to a traction bus voltage Ub and a traction bus current Ib, and calculating total traction network active power Ptr according to the active power Pca of the traction substation TSa, the reactive power Qca of the traction substation TSa, the active power Pcb of the traction substation TSb and the reactive power Qcb of the traction TSb: ptr = Pca + Pcb, calculating the total reactive power Qtr of the traction network as: qtr = Qca + Qcb;
according to the total active power Ptr of the traction network, the active power Pca of the traction substation TSa and the active power Pcb of the traction substation TSb, the central controller CC controls the ride-through power utilization device SES to utilize the power supply ride-through power on the two sides of the traction network OCS, so that the ride-through power returned to the power grid meets the preset requirement.
Further, the step that the central controller CC controls the ride-through power utilization device SES to utilize the power supply ride-through power on the both sides of the OCS of the traction grid according to the total active power Ptr of the traction grid, the active power Pca of the traction substation TSa and the active power Pcb of the traction substation TSb, so that the ride-through power returned to the grid meets the preset requirement includes:
if the total active power Ptr of the traction network meets the following conditions: ptr > P0, at this time, judging whether the positive and negative of the Pca and the Pcb, if the positive and negative of the Pca and the Pcb >0, entering a first working condition, controlling the energy storage device ESD to operate in a discharge state by the central controller CC, wherein the discharge power is pdis, and if the positive and negative of the Pca and the Pcb <0, entering a second working condition, controlling the energy storage device ESD to operate in a first charge state by the central controller CC, wherein the first charge power is pch 1;
if the total active power Ptr of the traction network meets the following conditions: p0 is greater than or equal to 0 and smaller than or equal to Ptr, the working condition III is entered, the central controller CC controls the ESD of the energy storage device to operate in a second charging state, and the second charging power is pch 2;
if the total active power Ptr of the traction network meets the following conditions: ptr is less than or equal to 0, the working condition IV is entered, the central controller CC controls the energy storage device ESD to operate in a third charging state, and the third charging power is pch 3;
wherein P0 is the no-load active loss of the traction network.
Further, in the first operating condition, the discharge power pdis of the energy storage device ESD is: pdis = min (Ptr, Pe);
in the second working condition, the first charging power pch1 of the energy storage device ESD is: pch1= | min (Pca, Pcb) |, energy storage device ESD outputs traction network total reactive power Qtr;
in the third working condition, the second charging power pch2 of the energy storage device ESD is: pch2= | min (Pca, Pcb) |; the energy storage device ESD outputs total reactive power Qtr of the traction network;
in the fourth working condition, the active power returned to the traction substation Tsa is noted as Paa, the active power returned to the traction substation TSb is noted as Pbb, if Pa is greater than 0, Paa =0, and if Pa is less than or equal to 0, Paa = Pa; if Pb >0, Pbb =0, if Pb ≦ 0, Pbb = Pb; calculating the total feedback power Pab of the traction substation TSa and the traction substation TSb as follows: pab = | Paa + Pbb |;
when the total feedback power Pab =0, the energy storage device is in an ESD standby state; when total feedback power Pab ≠ 0, the third charging power pch3 of the energy storage device ESD is: pch3= min (Pab, Pe);
the Pe is the ESD rated power of the energy storage device, and | x | is the operation of solving an absolute value.
The working principle of the invention is as follows: in general, a bilateral supply traction network and a power grid form a parallel structure, when the traction network is unloaded, a part of power transmitted by the power grid flows through the traction network, and the corresponding power is called through power (the corresponding current is called equilibrium current). The distributed capacitance of the transmission line and the traction network also generates charging current and charging power. The traversing power flows along the traction network, belonging to the longitudinal component, whereas the charging power, like the load, is called the transverse component. When the traction network is in no-load, the active component of the measured traversing power can be selected to reflect the traversing condition, and the active component can be measured at any convenient part of the incoming line of the traction substation, the traction feeder line and the traction network. When the network load is dragged, if the traction load generates a larger transverse component which is equal to or larger than the value of the through power returned to the network, only the transverse component effect is shown. When the load of the traction network is a regenerative braking working condition, the generated regenerative braking power is firstly consumed nearby by a co-running traction train, the co-phase power supply of a traction substation and the bilateral power supply of a subarea station are equivalent to prolonging the power supply arm, the traction train in the co-running can absorb the regenerative power of the braking train with a higher probability, so that the regenerative power finally returned to the power grid is greatly reduced to 0, the redundant regenerative energy can be superposed with the crossing power and then fed back to the power grid through the traction substation, the property of the crossing power returned to the power grid is the same as that of the crossing power, and the metering problem can be brought. The method comprises the following steps of judging the operation condition of a traction network in a bilateral power supply interval by utilizing voltage and current information of two traction substations in bilateral power supply: under the no-load working condition, the through power utilization device arranged on the traction network stores the through power, so that the through power returned to the power grid reaches a preset value or even 0; under the working condition of regenerative braking, the ride-through power containing the regenerative braking is utilized; and under the traction working condition, the crossing power utilization device is controlled to release energy for the train to use.
Compared with the prior art, the invention has the beneficial effects that:
firstly, when an electric phase separation where the subareas are located is cancelled and a no-electric area is eliminated, the passing-through power is converted into available power and electric energy, and the power returned to the power grid meets the preset requirement, even is 0.
Under the condition that the railway power supply structure of the power grid is not changed, the crossing power of the traction network is utilized, the negative influence caused by the crossing power measurement is eliminated, and the advantage of bilateral power supply is fully exerted;
thirdly, the reliability is high, the influence of the operation condition is avoided, and the adjustment is convenient;
fourthly, the mutual utilization of the energy of the power supply arms is facilitated, and the direct utilization rate of the regenerative braking energy is improved
And fifthly, the technology is advanced, reliable and easy to implement.
Drawings
Fig. 1 is a schematic diagram of the connection relationship between the bilateral power supply and the power grid according to the present invention.
FIG. 2 is a schematic view of the structure of 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, a single-line schematic diagram of a connection relationship between the bilateral power supply and the power grid is shown in fig. 1, and the bilateral power supply traction network OCS forms a parallel structure with the power grid G through the traction substations TSa and TSb on both sides. According to the parallel shunt principle, the bilateral power supply can generate a current component parallel to the power grid G in the traction network OCS, namely a balanced current, and generates through power, so that the electric quantity charging problem of the railway is influenced. If the charge of the primary side electric quantity of the two electric substations with the power supplied from the two sides adopts a return-to-counter mode, the problem can be well solved, and if the charge is not counted by return or is counted by return, the charge becomes an extra burden of a railway. For this purpose,
as shown in fig. 2, the present embodiment provides a system for utilizing crossing power of a traction substation with bilateral power supply, which includes a traction network OCS, a traction substation TSa and a traction substation TSb providing bilateral power supply to the traction network OCS, and a substation between the traction substation TSa and the traction substation TSb, and further includes a crossing power utilization device SES and a central controller CC disposed in the substation; the method comprises the steps that a traction bus voltage transformer PTa, a traction bus incoming line current transformer CTaa and a traction feeder line current transformer CTa are arranged in a traction substation TSa, and a traction bus voltage transformer PTb, a traction bus incoming line current transformer CTbb and a traction feeder line current transformer CTb are arranged in a traction substation TSb; the central controller CC acquires the traction bus and the traction feeder electric quantity information of the traction substation TSa and the traction substation TSb in real time, and controls the ride-through power utilization device SES to utilize the ride-through power of the bilateral power supply traction network OCS, so that the ride-through power returned to the power grid reaches the preset requirement.
In the application scenario of this embodiment, the traction network OCS between the substation TSa and the substation TSb adopts bilateral power supply, and meanwhile, the reactor needs to be connected in series to the secondary side of the traction transformer of the traction substation to reduce the balance current, or the voltage compensation device is added in the traction substation to implement voltage phase compensation to reduce the voltage difference output by the two traction substations with bilateral power supply, which is mentioned in the background art, this embodiment does not impose requirements on the two measures, that is, this embodiment may adopt or may not adopt the two measures, the core of this embodiment lies in utilizing the traversing power or the power of the return substation with traversing power, and emphasizes the processing after the result of the occurrence of the traversing power rather than inhibiting the generation of the traversing power, which is the key point of this embodiment in the prior art, and in addition, on the basis of the technical concept of utilizing the traversing power, in the actual working condition, the regenerative power generated during train braking and the originally existing ride-through power return to the substation together exist, so the utilization of the ride-through power in this embodiment may also mean that the power of the return substation containing the ride-through power is utilized, so that the negative influence of the ride-through power on the power grid and the user is eliminated, and the advantage of bilateral power supply is fully exerted.
Preferably, the ride-through power utilization device SES comprises an internet access device and an energy storage device ESD;
the internet surfing device comprises an internet surfing line L1, an internet surfing line L2 and an internet surfing bus LB; the upper net bus LB is connected with the two sides of the sectionalizer CSP in the subarea through an upper net line L1 and an upper net line L2;
and the energy storage device ESD is connected with an internet bus LB of the internet access device.
Preferably, the traction substation TSa and the traction substation TSb both use in-phase power supply, and left and right power supply arms of the traction substation TSa and the traction substation TSb are connected through the sectionalizer CSP.
Here, after the in-phase power supply technology is adopted by the traction substation TSa and the traction substation TSb, the power supply arm is extended, and the traction train in the same-running train can absorb the regenerative power of the braking train with a higher probability, so that the direct utilization rate of regenerative braking energy is improved, and the regenerative power finally returned to the power grid is greatly reduced, even to 0. For convenience in maintenance, the present embodiment can be used in cooperation with a sectionalized measurement and control protection technology by means of electric sectionalization of the sectionalized power, so that the train can pass through without power failure and is convenient to overhaul and maintain, and on the other hand, a power grid structure for supplying power to both sides of the railway is not changed, so that conditions are provided for access of a power utilization system.
Preferably, the CC measurement and control end of the central controller is connected with the energy storage device ESD through an optical fiber pair; the input end of the central controller CC is respectively connected with the measuring ends of a traction bus voltage transformer PTA, a traction bus incoming line current transformer CTaa and a traction feeder line current transformer CTa arranged in the traction substation TSa, and a traction bus voltage transformer PTb, a traction bus incoming line current transformer CTbb and a traction feeder line current transformer CTb arranged in the traction substation TSb through optical fiber pairs.
Here, when there is a through power in the traction network OCS, the central controller CC may control the energy storage device ESD to store the through power, so that the through power returned to the grid meets the preset requirement. When the regenerative braking power is not completely absorbed by the traction train in the same train, the rest regenerative braking power and the ride-through power are superposed to form equivalent ride-through power, and the central controller CC can control the energy storage device ESD to store the equivalent ride-through power containing the regenerative braking power so that the ride-through power returned to the power grid meets the preset requirement.
Example 2
As shown in fig. 3, this embodiment provides a control method based on the system for using power to pass through by the bilateral power supply traction network provided by the partition in embodiment 1, which is applied to a central controller CC, and is implemented by the following technical solutions: step S100: detecting electric quantity information of a traction substation TSa and a traction substation TSb;
step S200: calculating power information of the traction substation TSa and the traction substation TSb according to the electric quantity information of the traction substation TSa and the traction substation TSb, wherein the power flowing from the traction substation TSa or the traction substation TSb to the traction network OCS is positive, and the power flowing from the traction network OCS to the traction substation TSa or the traction substation TSb is negative;
step S300: according to the power information, the central controller CC controls the ride-through power utilization device SES to utilize the ride-through power of the OCS, so that the ride-through power returned to the power grid meets the preset requirement.
Preferably, the method comprises:
the central controller CC respectively detects traction bus voltage Ua, traction bus current Ia and traction network feeder line current Ica of the traction substation TSa and traction bus voltage Ub, traction bus current Ib and traction network feeder line current Icb of the traction substation TSb;
the method comprises the following steps of calculating active power Pca and reactive power Qca provided by a traction substation TSa to a traction network according to a traction bus voltage Ua and a traction network feeder current Ica, calculating active power Pcb and reactive power Qcb provided by the traction substation TSb to the traction network according to a traction bus voltage Ub and a traction network feeder current Icb, calculating total active power Pa and total reactive power Qa of the traction substation TSa according to a traction bus voltage Ua and a traction bus current Ia, calculating total active power Pb and total reactive power Qb of the traction substation TSb according to a traction bus voltage Ub and a traction bus current Ib, and calculating total traction network active power Ptr according to the active power Pca of the traction substation TSa, the reactive power Qca of the traction substation TSa, the active power Pcb of the traction substation TSb and the reactive power Qcb of the traction TSb: ptr = Pca + Pcb, calculating the total reactive power Qtr of the traction network as: qtr = Qca + Qcb;
according to the total active power Ptr of the traction network, the active power Pca of the traction substation TSa and the active power Pcb of the traction substation TSb, the central controller CC controls the ride-through power utilization device SES to utilize the power supply ride-through power on the two sides of the traction network OCS, so that the ride-through power returned to the power grid meets the preset requirement.
Preferably, the step of controlling, by the central controller CC, the traversing power utilization device SES to utilize the power supply traversing power of the OCS of the traction grid according to the total active power Ptr of the traction grid, the active power Pca of the traction substation TSa, and the active power Pcb of the traction substation TSb so that the traversing power returned to the grid meets the preset requirement includes:
if the total active power Ptr of the traction network meets the following conditions: ptr > P0, at the moment, judging whether the positive and negative of the Pca and the Pcb are positive or negative, if the Pca and the Pcb are greater than 0, entering a first working condition, controlling the ESD of the energy storage device to operate in a discharge state by the central controller CC, wherein the discharge power is pdis, and if the Pca and the Pcb are less than 0, entering a second working condition, controlling the ESD of the energy storage device to operate in a first charge state by the central controller CC, wherein the first charge power is pch 1;
if the total active power Ptr of the traction network meets the following conditions: p0 is greater than or equal to 0 and smaller than or equal to Ptr, the working condition III is entered, the central controller CC controls the ESD of the energy storage device to operate in a second charging state, and the second charging power is pch 2;
if the total active power Ptr of the traction network meets the following conditions: ptr is less than or equal to 0, the working condition IV is entered, the central controller CC controls the energy storage device ESD to operate in a third charging state, and the third charging power is pch 3;
wherein P0 is the no-load active loss of the traction network.
Preferably, in the first operating condition, the discharge power pdis of the energy storage device ESD is: pdis = min (Ptr, Pe);
in the second working condition, the first charging power pch1 of the energy storage device ESD is: pch1= | min (Pca, Pcb) |, the energy storage device ESD outputs the total reactive power Qtr of the traction network;
in the third working condition, the second charging power pch2 of the energy storage device ESD is: pch2= | min (Pca, Pcb) |; the energy storage device ESD outputs total reactive power Qtr of the traction network;
in the fourth working condition, the active power returned to the traction substation Tsa is noted as Paa, the active power returned to the traction substation TSb is noted as Pbb, if Pa is greater than 0, Paa =0, and if Pa is less than or equal to 0, Paa = Pa; if Pb >0, Pbb =0, if Pb ≦ 0, Pbb = Pb; calculating the total feedback power Pab of the traction substation TSa and the traction substation TSb as follows: pab = | Paa + Pbb |;
when the total feedback power Pab =0, the energy storage device is in an ESD standby state; when total feedback power Pab ≠ 0, the third charging power pch3 of the energy storage device ESD is: pch3= min (Pab, Pe);
the Pe is the ESD rated power of the energy storage device, and | x | is the operation of solving an absolute value.
The above are only preferred embodiments of the present invention, and it should be noted that the above preferred embodiments 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 (8)
1. The utility model provides a both sides power supply of subregion institute pulls net and passes through power utilization system, includes and pulls the net OCS, provides the traction substation TSa and the traction substation TSb of both sides power supply and pulls the subregion institute between transformer substation TSa and the traction substation TSb that pulls the net OCS, its characterized in that: the system also comprises a crossing power utilization device SES and a central controller CC which are arranged in the subarea; the method comprises the following steps that a traction bus voltage transformer PTa, a traction bus incoming line current transformer CTaa and a traction feeder line current transformer CTa are arranged in a traction substation TSa, and a traction bus voltage transformer PTb, a traction bus incoming line current transformer CTbb and a traction feeder line current transformer CTb are arranged in a traction substation TSb; the central controller CC acquires the traction bus and the traction feeder electric quantity information of the traction substation TSa and the traction substation TSb in real time, and controls the ride-through power utilization device SES to utilize the ride-through power of the bilateral power supply traction network OCS, so that the ride-through power returned to the power grid reaches the preset requirement.
2. The system according to claim 1, wherein the system comprises: the SES comprises an internet access device and an energy storage device ESD;
the internet surfing device comprises an internet surfing line L1, an internet surfing line L2 and an internet surfing bus LB; the upper net bus LB is connected with the two sides of the sectionalizer CSP in the subarea through an upper net line L1 and an upper net line L2;
and the energy storage device ESD is connected with an internet bus LB of the internet access device.
3. The system according to claim 1, wherein the system comprises: the traction substation TSa and the traction substation TSb both adopt in-phase power supply, and left and right power supply arms of the traction substation TSa and the traction substation TSb are connected through the sectionalizer CSP respectively.
4. The system according to claim 1, wherein the system comprises: the CC measurement and control end of the central controller is connected with the energy storage device ESD through an optical fiber pair; the measuring ends of the traction bus voltage transformer PTa, the traction bus incoming line current transformer CTaa and the traction feeder line current transformer CTa arranged in the traction substation TSa and the measuring ends of the traction bus voltage transformer PTb, the traction bus incoming line current transformer CTbb and the traction feeder line current transformer CTb arranged in the traction substation TSb are connected with the input end of the central controller CC through optical fiber pairs.
5. A control method for the bilateral power supply traction network crossing power utilization system based on the subarea station of any one of claims 1-4, characterized by comprising the following steps:
detecting electric quantity information of a traction substation TSa and a traction substation TSb;
calculating power information of the traction substation TSa and the traction substation TSb according to the electric quantity information of the traction substation TSa and the traction substation TSb, wherein the power flowing from the traction substation TSa or the traction substation TSb to the traction network OCS is positive, and the power flowing from the traction network OCS to the traction substation TSa or the traction substation TSb is negative;
according to the power information, the central controller CC controls the ride-through power utilization device SES to utilize the ride-through power of the OCS, so that the ride-through power returned to the power grid meets the preset requirement.
6. The control method according to claim 5, characterized in that the method comprises:
the central controller CC respectively detects traction bus voltage Ua, traction bus current Ia and traction network feeder line current Ica of the traction substation TSa and traction bus voltage Ub, traction bus current Ib and traction network feeder line current Icb of the traction substation TSb;
the method comprises the following steps of calculating active power Pca and reactive power Qca provided by a traction substation TSa to a traction network according to a traction bus voltage Ua and a traction network feeder current Ica, calculating active power Pcb and reactive power Qcb provided by the traction substation TSb to the traction network according to a traction bus voltage Ub and a traction network feeder current Icb, calculating total active power Pa and total reactive power Qa of the traction substation TSa according to a traction bus voltage Ua and a traction bus current Ia, calculating total active power Pb and total reactive power Qb of the traction substation TSb according to a traction bus voltage Ub and a traction bus current Ib, and calculating total traction network active power Ptr according to the active power Pca of the traction substation TSa, the reactive power Qca of the traction substation TSa, the active power Pcb of the traction substation TSb and the reactive power Qcb of the traction TSb: ptr = Pca + Pcb, calculating the total reactive power Qtr of the traction network as: qtr = Qca + Qcb;
according to the total active power Ptr of the traction network, the active power Pca of the traction substation TSa and the active power Pcb of the traction substation TSb, the central controller CC controls the ride-through power utilization device SES to utilize the power supply ride-through power on the two sides of the traction network OCS, so that the ride-through power returned to the power grid meets the preset requirement.
7. The control method according to claim 6, characterized in that: the central controller CC controls the ride-through power utilization device SES to utilize the power supply ride-through power on the two sides of the OCS of the traction network according to the total active power Ptr of the traction network, the active power Pca of the traction substation TSa and the active power Pcb of the traction substation TSb, so that the ride-through power returned to the power network meets the preset requirement and comprises the following steps:
if the total active power Ptr of the traction network meets the following conditions: ptr > P0, at the moment, judging whether the positive and negative of the Pca and the Pcb are positive or negative, if the Pca and the Pcb are greater than 0, entering a first working condition, controlling the ESD of the energy storage device to operate in a discharge state by the central controller CC, wherein the discharge power is pdis, and if the Pca and the Pcb are less than 0, entering a second working condition, controlling the ESD of the energy storage device to operate in a first charge state by the central controller CC, wherein the first charge power is pch 1;
if the total active power Ptr of the traction network meets the following conditions: p0 is greater than or equal to 0 and smaller than or equal to Ptr, the working condition III is entered, the central controller CC controls the ESD of the energy storage device to operate in a second charging state, and the second charging power is pch 2;
if the total active power Ptr of the traction network meets the following conditions: ptr is less than or equal to 0, the working condition IV is entered, the central controller CC controls the energy storage device ESD to operate in a third charging state, and the third charging power is pch 3;
wherein P0 is the no-load active loss of the traction network.
8. The control method according to claim 7, characterized in that:
in the first working condition, the discharge power pdis of the energy storage device ESD is: pdis = min (Ptr, Pe);
in the second working condition, the first charging power pch1 of the energy storage device ESD is: pch1= | min (Pca, Pcb) |, energy storage device ESD outputs traction network total reactive power Qtr;
in the third working condition, the second charging power pch2 of the energy storage device ESD is: pch2= | min (Pca, Pcb) |; the energy storage device ESD outputs total reactive power Qtr of the traction network;
in the fourth working condition, the active power returned to the traction substation Tsa is noted as Paa, the active power returned to the traction substation TSb is noted as Pbb, if Pa is greater than 0, Paa =0, and if Pa is less than or equal to 0, Paa = Pa; if Pb >0, Pbb =0, if Pb ≦ 0, Pbb = Pb; calculating the total feedback power Pab of the traction substation TSa and the traction substation TSb as follows: pab = | Paa + Pbb |;
when the total feedback power Pab =0, the energy storage device is in an ESD standby state; when total feedback power Pab ≠ 0, the third power pch3 that charges of energy memory ESD is: pch3= min (Pab, Pe);
the Pe is the ESD rated power of the energy storage device, and | x | is the operation of solving an absolute value.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210261897.8A CN114336643B (en) | 2022-03-17 | 2022-03-17 | System for utilizing passing power of bilateral power supply traction network of regional station and control method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210261897.8A CN114336643B (en) | 2022-03-17 | 2022-03-17 | System for utilizing passing power of bilateral power supply traction network of regional station and control method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN114336643A CN114336643A (en) | 2022-04-12 |
| CN114336643B true CN114336643B (en) | 2022-05-17 |
Family
ID=81033704
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210261897.8A Active CN114336643B (en) | 2022-03-17 | 2022-03-17 | System for utilizing passing power of bilateral power supply traction network of regional station and control method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN114336643B (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115042675B (en) * | 2022-08-17 | 2022-11-04 | 西南交通大学 | Method for controlling voltage difference at tail end of power supply arm of alternating current-direct current power supply subarea |
| CN117477606B (en) * | 2023-12-27 | 2024-03-15 | 中国铁路设计集团有限公司 | Traction power supply power equalization and adjustment method and device based on bidirectional converter |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105790274A (en) * | 2016-03-09 | 2016-07-20 | 西南交通大学 | Power flow control device and control method for run-through power supply system converter type traction substation |
| CN108667041A (en) * | 2018-06-15 | 2018-10-16 | 西南交通大学 | A kind of the negative phase-sequence centralized compensation control system and its control method of traction substation group |
| CN110611323A (en) * | 2019-09-30 | 2019-12-24 | 西南交通大学 | Electrified railway in-phase power supply comprehensive compensation device and comprehensive compensation method thereof |
| CN113077979A (en) * | 2021-04-26 | 2021-07-06 | 中铁二院工程集团有限责任公司 | Adjustable traction transformer for flexible through bilateral power supply system and balanced current suppression method |
Family Cites Families (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103434421B (en) * | 2013-07-29 | 2015-10-21 | 华北电力大学（保定） | A kind of mixing inter-act DC traction power-supply system based on new forms of energy |
| CN103552488B (en) * | 2013-11-05 | 2015-11-25 | 西南交通大学 | A kind of electrified railway two way feeding system |
| CN105691244B (en) * | 2016-03-09 | 2017-12-01 | 西南交通大学 | A kind of system zero load monitoring method of electric railway insertion power supply |
| CN106183897B (en) * | 2016-09-23 | 2018-08-10 | 西南交通大学 | A kind of electric railway subregion institute's automatic neutral-section passing system and its control method |
| CN109217330B (en) * | 2018-09-12 | 2023-10-27 | 西南交通大学 | In-phase power supply and transformation system of electrified railway |
| CN110504697A (en) * | 2019-09-30 | 2019-11-26 | 西南交通大学 | A kind of electrified railway in-phase power supply comprehensive compensating device and its comprehensive compensation method |
| CN110729731B (en) * | 2019-11-22 | 2024-04-12 | 西南交通大学 | Through type in-phase power supply structure of electrified railway and control method thereof |
| CN212046997U (en) * | 2020-03-06 | 2020-12-01 | 苏州大学 | Return circuit device for limiting power cross-area transmission of urban rail transit power supply system |
| CN113212253A (en) * | 2021-05-27 | 2021-08-06 | 广州地铁集团有限公司 | Through type traction power supply system |
| CN113135125A (en) * | 2021-06-01 | 2021-07-20 | 中国铁路青藏集团有限公司 | Electrified railway link up power supply system |
-
2022
- 2022-03-17 CN CN202210261897.8A patent/CN114336643B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105790274A (en) * | 2016-03-09 | 2016-07-20 | 西南交通大学 | Power flow control device and control method for run-through power supply system converter type traction substation |
| CN108667041A (en) * | 2018-06-15 | 2018-10-16 | 西南交通大学 | A kind of the negative phase-sequence centralized compensation control system and its control method of traction substation group |
| CN110611323A (en) * | 2019-09-30 | 2019-12-24 | 西南交通大学 | Electrified railway in-phase power supply comprehensive compensation device and comprehensive compensation method thereof |
| CN113077979A (en) * | 2021-04-26 | 2021-07-06 | 中铁二院工程集团有限责任公司 | Adjustable traction transformer for flexible through bilateral power supply system and balanced current suppression method |
Non-Patent Citations (1)
| Title |
|---|
| 黄小红等.电气化铁路同相储能供电技术.《西南交通大学学报》.2020,第55卷(第4期), * |
Also Published As
| Publication number | Publication date |
|---|---|
| CN114336643A (en) | 2022-04-12 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN114336643B (en) | System for utilizing passing power of bilateral power supply traction network of regional station and control method | |
| CN103280799B (en) | A kind of start-stop method of THE UPFC | |
| CN103895534B (en) | Double-current system traction power supply system based on modularized multi-level current converter | |
| WO2023173784A1 (en) | Intelligent traction substation and power flow control method therefor | |
| WO2023173783A1 (en) | Traction network bilateral power supply ride-through power utilization system, and control method | |
| CN111361463A (en) | Flexible bilateral power supply power flow control system of alternating current traction network | |
| CN110112754A (en) | A kind of electric railway homo-phase traction power supply system and its control method | |
| CN111137180A (en) | Traction power supply system and method for electrified railway | |
| CN208797585U (en) | A kind of negative sequence compensation device of cophase supply electric substation | |
| CN108923429B (en) | In-phase power supply substation | |
| CN109347099A (en) | A kind of electrified railway in-phase power supply system | |
| CN103904675B (en) | The interconnected current transformer of a kind of feeder line | |
| CN105870927A (en) | Unified power flow controller with multiple operational modes | |
| Sun et al. | Coordination control for multi-voltage-level dc grid based on the dc–dc converters | |
| CN109066737A (en) | A kind of negative sequence compensation devices and methods therefor of traction-compensator transformer | |
| Teeuwsen et al. | 1400 MW New Zealand HVDC upgrade: Introducing power modulation controls and round power mode | |
| CN105449662A (en) | Method for determining direct current isolated island operation control measures | |
| CN210062722U (en) | Electrified railway cophase traction power supply system | |
| CN108725262A (en) | A kind of power supply system being coupled tractive transformer based on Vv | |
| CN208673836U (en) | A kind of compensator transformer | |
| Fardanesh et al. | Dynamic studies of the NYS transmission system with the Marcy CSC in the UPFC and IPFC configurations | |
| CN115189354A (en) | Through type cophase power supply system structure of electrified railway | |
| CN113492732B (en) | AT traction network distributed power generation and supply system and control method | |
| CN208797589U (en) | A kind of negative sequence compensation device of traction-compensator transformer | |
| CN209344795U (en) | A kind of electrified railway in-phase power supply system based on SCOTT wiring |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |