CN114336640B - Intelligent three-phase traction power supply system and power flow control method thereof - Google Patents
Intelligent three-phase traction power supply system and power flow control method thereof Download PDFInfo
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Abstract
The invention provides an intelligent three-phase traction power supply system and a power flow control method thereof, and relates to the technical field of traction power supply of electrified railways. The intelligent three-phase traction power supply system is provided with a power flow regulation and control device and a controller, bilateral power supply is carried out on a traction network, and the power flow regulation and control device is controlled to realize self utilization of power generation power flow according to three-phase bus voltage and three-phase feeder line current electric quantity information, so that the power generation power flow returned to the power grid is 0; the invention utilizes the crossing tide without changing the three-phase power supply structure of the electrified railway by the power grid, eliminates the negative influence of the crossing tide on the power grid and users, fully exerts the advantages of three-phase power supply and is beneficial to directly supplying power to the power distribution system of the traction substation by regenerative braking energy.
Description
Technical Field
The invention relates to the technical field of alternating current electrified railway traction power supply, in particular to an intelligent three-phase traction power supply system and a power flow control method thereof.
Background
The rail transit power supply system is divided into a direct current system and an alternating current system. Urban rail transit mainly including subways and light rails generally adopts a direct current system. The direct current system has the problems of difficult overcoming of stray current pollution, difficult recovery of regenerative braking energy and the like. Main railways mainly adopt a power frequency single-phase alternating current system. The single-phase power-frequency alternating-current system has obvious defects: the method mainly solves the problems of electric energy quality mainly based on negative sequence, train speed and traction loss caused by electric phase separation and electric transient between trains and networks caused by the electric phase separation of the trains.
The three-phase power supply can thoroughly solve the problems of the direct current system and the alternating current system, and under the same power supply capacity, the three-phase system saves more materials in manufacturing and construction than the single-phase system, and has simple structure and excellent performance. In addition, the instantaneous values of the three-phase electric power are kept constant. The three-phase system also has the advantages of eliminating a vehicle-mounted transformer, reducing the axle weight of the train, realizing the light weight of the train and improving the carrying efficiency and the running speed.
The three-phase cable for three-phase power supply and the power grid form a parallel structure, wherein the three-phase cable has a tide and a current which are parallel to the power grid and flow through, the corresponding tide is called a through tide (the corresponding current is called a balanced current), at the moment, the through tide flows in from a main transformer at one side of the three-phase power supply system and flows out from a main transformer at the other side, namely, the through tide flows in from the power grid to the main transformer of the three-phase cable in a load (power utilization) state, and the through tide flows in from the three-phase cable to the main transformer of the power grid in a power generation state. The influence of the traversing power flow on the power grid and the metering problem cannot be ignored. If the passing-through tide returns to the power grid, the main substation generates electricity, if the passing-through tide returns to the power grid, the electricity consumption of the other main substation is counteracted, namely the passing-through tide is treated according to the electricity generation, the user has no economic loss, if the passing-through tide returns to the power grid, the passing-through tide is not counted or is counted, the economic loss of the user is caused, under the condition, how to reduce the passing-through tide by the three-phase power supply or how to utilize the passing-through tide is needed to be researched, the influence on the power grid and the user is reduced while the advantages of the three-phase power supply are normally exerted, and the electricity consumption benefit is improved.
Some methods for suppressing the crossing tide are proposed, such as chinese patent 1 "a bilateral power supply system for electrified railway" (No. CN 103552488B), chinese patent 2 "a bilateral power supply method for electrified railway" (No. CN 110126682B), etc., however, these methods are all for single-phase traction power supply systems, and there is no research on the suppression of the three-phase power supply crossing tide. In addition, in consideration of the difficult problem that the key of the passing through tide is the tide returning to the power grid, the three-phase power supply passing through tide utilization technology of the electrified railway is provided, so that the passing through tide is converted into usable tide and electric energy, and the tide returning to the power grid meets the requirement of even 0. The application of the intelligent traction substation and the power flow control method thereof on the same day focuses on a traversing power flow utilization technology during single-phase traction power supply, and the application focuses on a traversing power flow utilization technology during three-phase traction power supply.
Disclosure of Invention
One of the purposes of the invention is to provide an intelligent three-phase traction power supply system, which can effectively solve the following technical problems: (1) the power flow of the three-phase traction power supply system is controllable; (2) and utilizing the power generation flow returned from the three-phase bilateral cable TC to the power grid, so that the power generation flow returned to the power grid meets the preset requirement.
The invention is realized by the following technical means: an intelligence three-phase traction power supply system, includes main transformer MT, its characterized in that: the intelligent three-phase traction power supply system is provided with a power flow regulation and control device PCD and a controller CC, the primary side of a main transformer MT is connected with a three-phase power grid, the secondary side of the main transformer MT is connected with a three-phase bus MB, the three-phase bus MB is connected with a three-phase bilateral cable TC adopting bilateral power supply through a three-phase feeder Fa, a feeder Fb and a feeder Fc, the three-phase bilateral cable TC is connected with a traction network TN through one or more three-phase traction transformers, and the traction network TN is supplied with electric energy to a train through a three-phase contact type current; and the controller CC controls the power flow regulation and control device PCD to utilize the power flow returned to the power grid from the three-phase bilateral cable TC according to the three-phase bus MB, the three-phase feeder Fa, the feeder Fb and the electric quantity information of the feeder Fc, so that the power flow returned to the power grid meets the preset requirement.
The three-phase bus MB is respectively provided with a voltage transformer Ya, a voltage transformer Yb and a voltage transformer Yc; the three-phase feeder line Fa, the feeder line Fb and the feeder line Fc are respectively provided with a current transformer La, a current transformer Lb and a current transformer Lc; the measurement ends of the voltage transformer Ya, the voltage transformer Yb, the voltage transformer Yc, the current transformer La, the current transformer Lb and the current transformer Lc are connected with the input end of the controller CC; and the control end of the controller CC is connected with the control end of the power flow regulating and controlling device PCD.
The power flow regulation and control device PCD comprises a converter MPC, a converter DPC, an energy storage device ES, a positive bus PB and a negative bus NB, wherein:
the converter MPC is a three-phase converter system, and three intersecting current sides of the converter MPC are respectively connected with a three-phase traction bus MB;
the alternating current side of the variable current device DPC is respectively connected with a three-phase bus u, a bus v and a bus w of a distribution system of the substation;
and the direct-current side positive electrode and the direct-current side negative electrode of the converter MPC, the converter DPC and the energy storage device ES are respectively connected with the corresponding positive bus PB and the corresponding negative bus NB.
The control end of the power flow control device PCD comprises a control end of a converter MPC, a converter DPC and an energy storage device ES.
The invention also aims to provide a control method of the intelligent three-phase traction power supply system, which comprises the following steps:
a control method of an intelligent three-phase traction power supply system comprises the following steps: the voltage transformer Ya, the voltage transformer Yb and the voltage transformer Yc detect the voltage of the three-phase bus MB, and the voltage transformer La, the voltage transformer Lb and the voltage transformer Lc detect the current of the three-phase feeder line Fa, the feeder line Fb and the feeder line Fc;
according to the detected voltage of the three-phase bus MB and the currents of the three-phase feeder line Fa, the feeder line Fb and the feeder line Fc, calculating to obtain the active power flow provided by the three-phase bus MB to the traction network TN through the three-phase feeder line Fa, the feeder line Fb and the feeder line Fc; active power flow from the three-phase bus MB to the traction network TN is positive, and active power flow from the traction network TN to the three-phase bus MB is negative;
according to the active power flow, the controller CC controls a current conversion device MPC, a current conversion device DPC or an energy storage device ES in the power flow regulation device PCD to utilize the power generation flow which flows from the traction network TN to the three-phase bus MB and then returns to the power grid, so that the power generation flow which returns to the power grid meets the preset requirement.
The method comprises the following steps: detecting a three-phase bus voltage Uabc by using a voltage transformer Ya, a voltage transformer Yb and a voltage transformer Yc; currents of the three-phase feeder line Fa, the feeder line Fb and the feeder line Fc detected by the voltage transformer La, the voltage transformer Lb and the voltage transformer Lc are respectively current Ia, current Ib and current Ic;
the controller CC calculates an active power flow P1 provided by the three-phase bus MB to the three-phase traction network TN according to the three-phase bus voltage Uabc, the three-phase feeder current Ia, the three-phase feeder current Ib and the three-phase feeder current Ic;
the controller CC controls a current transformation device MPC, a current transformation device DPC or an energy storage device ES in the current regulation device PCD according to the active current P1 to utilize the power generation current flowing from the traction network TN to the three-phase bus MB and then returning to the power grid, so that the current returning to the power grid meets the preset requirement.
If P1 is less than 0, the controller CC judges that the power flow returned to the power grid by the three-phase feeder line Fa, the feeder line Fb and the feeder line Fc is power generation power flow, and controls the converter MPC and the converter DPC in the power flow control device PCD to work and supply power to the three-phase bus u, the bus v and the bus w of the power distribution system; or controlling the converter MPC to charge the energy storage device ES, wherein the sum of the power generation flows of the converter MPC and the energy storage device ES is equal to | P1|, so that the power generation flow returned to the power grid =0, and the preset requirement is met;
if the P1 is greater than 0, the controller CC judges that the three-phase feeder line Fa, the feeder line Fb and the feeder line Fc are in a traction working condition, controls an energy storage device ES in the power flow regulation and control device PCD to supply power to a three-phase bus MB through a converter device MPC, and controls a converter device DPC in the power flow regulation and control device PCD to stand by;
if P1=0, the controller CC determines that the three-phase feeder line Fa, the feeder line Fb and the feeder line Fc are unloaded, and controls the power flow control device PCD to be in standby.
The working principle of the invention is as follows: the three-phase bilateral cable for three-phase power supply and a power grid form a parallel structure, the three-phase bilateral cable has a tide and a current which are parallel to the power grid and flow through, and the corresponding tide is called a through tide (the corresponding current is called a balanced current). The cross-over tide flows in from the main power substation on one side of the three-phase power supply system and flows out from the main power substation on the other side, namely the cross-over tide flows in from the power grid to the main power substation of the three-phase cable in a load (power utilization) state, and the cross-over tide flows in from the three-phase cable to the main power substation of the power grid in a power generation state. Charging current and charging tide can also occur in the distributed capacitance of the transmission line, the three-phase bilateral cable and the traction network. The cross-over current flows along the three-phase bilateral cable and belongs to a longitudinal component, while the charging current is called a transverse component like a load. When the three-phase bilateral cable is in no-load, the active component of the traversing tide is selected to be measured, so that the traversing condition can be reflected, and the active component can be measured at any convenient part of the incoming line of the substation, the three-phase feeder line and the three-phase bilateral cable. If the traction load generates a larger transverse component which is equal to or larger than the crossing tidal flow value returned to the power grid, only the transverse component effect is shown, namely the equivalent traction working condition is obtained. The operation condition of the three-phase bilateral cable is judged by utilizing the voltage and current information of the two three-phase power supply substations: under the no-load working condition, the crossing tide is stored in an energy storage device or converted into a self-power utilization system of a substation through a tide regulation and control device, so that the crossing tide returning to the power grid meets the preset requirement; under the traction working condition (or equivalent traction working condition), the energy storage device releases energy for the train to use; under the braking working condition, the regenerative power and the crossing power flow are stored in the energy storage device or converted into a self power utilization system of the substation through the power flow regulation and control device, so that the power flow returning to the power grid meets the preset requirement.
Compared with the prior art, the invention has the beneficial effects that:
the intelligent three-phase traction power supply system is a traction power supply system with controllable tide, wherein a novel structure is formed by arranging a current transformation device and an energy storage device, and both the passing tide returning to a power grid and the regenerative power generated by braking of an electric locomotive on the traction grid can be used as power generation tide through judgment and control, so that the power generation tide returning to the power grid meets the requirement, even is 0.
And secondly, under the condition that the three-phase power supply structure of the electrified railway by the power grid is not changed, the passing-through tide is utilized, the negative influence of the passing-through tide on the power grid and users is eliminated, and the advantages of three-phase power supply are fully exerted.
And thirdly, the utilization of three-phase power supply regenerated energy is facilitated, the direct utilization rate of the regenerated braking energy is improved, and the regenerated power and the electric energy returned to the power grid can meet the preset requirements and even be reduced to 0 under the normal condition.
And fourthly, the power flow regulating and controlling device can be connected with the energy storage device and a power distribution system to supply power, and the residual regenerative braking electric energy can be utilized besides the passing-through power flow.
And fifthly, the technology is advanced, reliable and easy to implement.
Drawings
FIG. 1 is a schematic view of the structure of the present invention.
Fig. 2 is a schematic connection diagram of a PCD control end of the power flow control device of the 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 an intelligent three-phase traction power supply system, which includes a main transformer MT, where the intelligent three-phase traction power supply system is provided with a power flow regulation and control device PCD and a controller CC, a primary side of the main transformer MT is connected to a three-phase power grid, a secondary side of the main transformer MT is connected to a three-phase bus MB, the three-phase bus MB is connected to a three-phase bilateral cable TC using bilateral power supply through a three-phase feeder Fa, a feeder Fb, and a feeder Fc, the three-phase bilateral cable TC is connected to a traction network TN through one or more three-phase traction transformers, and the traction network TN is supplied with electric energy to a train through a three-phase contact type current; and the controller CC controls the power flow regulation and control device PCD to utilize the power flow returned to the power grid from the three-phase bilateral cable TC according to the three-phase bus MB, the three-phase feeder Fa, the feeder Fb and the electric quantity information of the feeder Fc, so that the power flow returned to the power grid meets the preset requirement.
In this embodiment, the three-phase bilateral cable TC is connected to the traction network TN through one or more three-phase traction transformers, so that the traction network TN is powered in a full-line through manner.
For the intelligent three-phase traction power supply system as shown in fig. 1, the power flow of the intelligent three-phase traction power supply system returned to the power grid through the main transformer MT is the power generation power flow, and since bilateral power supply is adopted, the crossing power flow can occur on the three-phase bilateral cable TC, the power flow control device PCD can utilize the crossing power flow flowing to the main transformer MT of the intelligent three-phase traction power supply system as the power generation power flow, in practical situations, if the regenerative power generated when the locomotive brakes also flows to the intelligent substation, or the regenerative power remained because the regenerative power is not completely absorbed by the lead locomotives in the same line also flows to the main transformer MT of the intelligent three-phase traction power supply system, the regenerative power or the remained regenerative power flowing to the main transformer MT of the intelligent three-phase traction power supply system will be superposed with the crossing power flow by the controller CC as the total power generation power flow, the controller CC controls the power flow regulation and control device PCD to utilize the total power flow so that the power flow returned to the power grid meets the preset requirement, wherein the preset requirement can mean that the power flow returned to the power grid is controlled within a certain range, and can also mean that the power flow returned to the power grid is zero; for the intelligent three-phase traction power supply system shown in fig. 1, the intelligent three-phase traction power supply system is in a traction state through the power flow of the main transformer MT, and due to the adoption of bilateral power supply, the on-grid OCS (online charging system) can generate a through power flow, so that the power flow regulation and control device PCD can supply power to the main transformer MT of the intelligent three-phase traction power supply system; for the intelligent three-phase traction power supply system shown in fig. 1, when the power flow of the intelligent three-phase traction power supply system through the main transformer MT is 0, the power flow conversion device PCD is in standby.
The embodiment utilizes the passing-through tide without changing the three-phase power supply structure of the electrified railway by the power grid, eliminates the negative influence of the passing-through tide on the power grid and users, and fully exerts the advantages of three-phase power supply.
Preferably, the three-phase bus MB of the present embodiment is respectively provided with a voltage transformer Ya, a voltage transformer Yb and a voltage transformer Yc, and the three-phase feeder Fa, the feeder Fb and the feeder Fc are respectively provided with a current transformer La, a current transformer Lb and a current transformer Lc; the measurement ends of the voltage transformer Ya, the voltage transformer Yb, the voltage transformer Yc, the current transformer La, the current transformer Lb and the current transformer Lc are connected with the input end of the controller CC; and the control end of the controller CC is connected with the control end of the power flow regulating and controlling device PCD.
Preferably, the power flow control device PCD in this embodiment includes a converter MPC, a converter DPC, an energy storage device ES, a positive bus PB and a negative bus NB, where:
the converter MPC is a three-phase converter system, and three intersecting current sides of the converter MPC are respectively connected with a three-phase traction bus MB;
the alternating current side of the variable current device DPC is respectively connected with a three-phase bus u, a bus v and a bus w of a distribution system of the substation;
and the direct-current side positive electrode and the direct-current side negative electrode of the converter MPC, the converter DPC and the energy storage device ES are respectively connected with the corresponding positive bus PB and the corresponding negative bus NB.
Preferably, the control end of the power flow control device PCD in this embodiment includes a control end of the converter device MPC, the converter device DPC and the energy storage device ES.
Here, as shown in fig. 2, control ends of the converter MPC, the converter DPC, and the energy storage device ES in the power flow control device PCD are respectively connected to a control end of the controller CC, that is, the control end of the controller CC is connected to the control end of the power flow control device PCD.
Example 2
As shown in fig. 3, this embodiment provides a control method based on an intelligent three-phase traction power supply system, where the method includes:
step S100: the voltage transformer Ya, the voltage transformer Yb and the voltage transformer Yc detect the voltage of the three-phase bus MB, and the voltage transformer La, the voltage transformer Lb and the voltage transformer Lc detect the current of the three-phase feeder line Fa, the feeder line Fb and the feeder line Fc;
step S200: according to the detected voltage of the three-phase bus MB and the currents of the three-phase feeder line Fa, the feeder line Fb and the feeder line Fc, calculating to obtain the active power flow provided by the three-phase bus MB to the traction network TN through the three-phase feeder line Fa, the feeder line Fb and the feeder line Fc; active power flow from the three-phase bus MB to the traction network TN is positive, and active power flow from the traction network TN to the three-phase bus MB is negative;
step S300: and controlling a current transformation device MPC, a current transformation device DPC or an energy storage device ES in the current regulation device PCD according to the active power flow, and utilizing the power generation flow flowing from the traction network TN to the three-phase bus MB so as to return to the power grid, so that the power generation flow returned to the power grid meets the preset requirement.
Preferably, the method comprises:
the voltage transformer Ya, the voltage transformer Yb and the voltage transformer Yc detect three-phase bus voltage Uabc, and the voltage transformer La, the voltage transformer Lb and the voltage transformer Lc detect currents of a three-phase feeder line Fa, a three-phase feeder line Fb and a three-phase feeder line Fc to be current Ia, current Ib and current Ic respectively;
calculating to obtain an active power flow P1 provided by the three-phase bus MB to the three-phase traction network TN according to the three-phase bus voltage Uabc, the three-phase feeder current Ia, the current Ib and the current Ic;
controlling a converter MPC, a converter DPC or an energy storage device ES in a power flow regulation device PCD according to the active power flow P1 by utilizing the power generation power flow flowing from the traction network TN to the three-phase bus MB and then returning to the power grid, so that the power flow returning to the power grid meets the preset requirement.
Preferably, the method comprises the following steps:
if P1 is less than 0, the controller CC judges that the power flow returned to the power grid by the three-phase feeder line Fa, the feeder line Fb and the feeder line Fc is power generation power flow, and controls the converter MPC and the converter DPC in the power flow control device PCD to work and supply power to the three-phase bus u, the bus v and the bus w of the power distribution system; or controlling the converter MPC to charge the energy storage device ES, wherein the sum of the power generation flows of the converter MPC and the energy storage device ES is equal to | P1|, so that the power generation flow returned to the power grid =0, and the preset requirement is met;
if the P1 is greater than 0, the controller CC judges that the three-phase feeder line Fa, the feeder line Fb and the feeder line Fc are in a traction working condition, controls an energy storage device ES in the power flow regulation and control device PCD to supply power to a three-phase bus MB through a converter device MPC, and controls a converter device DPC in the power flow regulation and control device PCD to stand by;
if P1=0, the controller CC determines that the three-phase feeder line Fa, the feeder line Fb and the feeder line Fc are unloaded, and controls the power flow control device PCD to be in standby.
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 (8)
1. An intelligence three-phase traction power supply system, includes main transformer MT, its characterized in that: the intelligent three-phase traction power supply system is provided with a power flow regulation and control device PCD and a controller CC, the primary side of a main transformer MT is connected with a three-phase power grid, the secondary side of the main transformer MT is connected with a three-phase bus MB, the three-phase bus MB is connected with a three-phase bilateral cable TC adopting bilateral power supply through a three-phase feeder Fa, a feeder Fb and a feeder Fc, the three-phase bilateral cable TC is connected with a traction network TN, and the traction network TN provides electric energy to a train; the controller CC controls the power flow regulation and control device PCD according to the electric quantity information of the three-phase bus MB, the three-phase feeder Fa, the feeder Fb and the feeder Fc, and the power flow returned to the power grid from the three-phase bilateral cable TC is utilized in a power supply or energy storage mode to the power distribution system, so that the power flow returned to the power grid meets the preset requirement.
2. The intelligent three-phase traction power supply system according to claim 1, wherein: the three-phase bilateral cable TC is connected with a traction network TN through one or more three-phase traction transformers, and the traction network TN is supplied with electric energy to a train through a three-phase contact type current-receiving flow.
3. The intelligent three-phase traction power supply system according to claim 1 or 2, wherein the power flow control device PCD comprises a converter device MPC, a converter device DPC, an energy storage device ES, a positive bus PB and a negative bus NB, wherein:
the converter MPC is a three-phase converter system, and three intersecting current sides of the converter MPC are respectively connected with a three-phase traction bus MB;
the alternating current side of the variable current device DPC is respectively connected with a three-phase bus u, a bus v and a bus w of a distribution system of the substation;
and the direct-current side positive electrode and the direct-current side negative electrode of the converter MPC, the converter DPC and the energy storage device ES are respectively connected with the corresponding positive bus PB and the corresponding negative bus NB.
4. The intelligent three-phase traction power supply system according to claim 3, wherein: the three-phase bus MB is respectively provided with a voltage transformer Ya, a voltage transformer Yb and a voltage transformer Yc; the three-phase feeder line Fa, the feeder line Fb and the feeder line Fc are respectively provided with a current transformer La, a current transformer Lb and a current transformer Lc; the measurement ends of the voltage transformer Ya, the voltage transformer Yb, the voltage transformer Yc, the current transformer La, the current transformer Lb and the current transformer Lc are connected with the input end of the controller CC; and the control end of the controller CC is connected with the control end of the power flow regulating and controlling device PCD.
5. The intelligent three-phase traction power supply system according to claim 4, wherein the control end of the power flow control device PCD comprises control ends of a current transformer MPC, a current transformer DPC and an energy storage device ES.
6. A control method of the intelligent three-phase traction power supply system based on the claim 4 or 5 is characterized in that: the method comprises the following steps:
the voltage transformer Ya, the voltage transformer Yb and the voltage transformer Yc detect the voltage of the three-phase bus MB, and the voltage transformer La, the voltage transformer Lb and the voltage transformer Lc detect the current of the three-phase feeder line Fa, the feeder line Fb and the feeder line Fc;
according to the detected voltage of the three-phase bus MB and the currents of the three-phase feeder line Fa, the feeder line Fb and the feeder line Fc, calculating to obtain the active power flow provided by the three-phase bus MB to the traction network TN through the three-phase feeder line Fa, the feeder line Fb and the feeder line Fc; active power flow from the three-phase bus MB to the traction network TN is positive, and active power flow from the traction network TN to the three-phase bus MB is negative;
according to the active power flow, the controller CC controls a current conversion device MPC, a current conversion device DPC or an energy storage device ES in the power flow regulation device PCD to utilize the power generation flow which flows from the traction network TN to the three-phase bus MB and then returns to the power grid, so that the power generation flow which returns to the power grid meets the preset requirement.
7. The control method according to claim 6, characterized in that: the method comprises the following steps: detecting a three-phase bus voltage Uabc by using a voltage transformer Ya, a voltage transformer Yb and a voltage transformer Yc; currents of the three-phase feeder line Fa, the feeder line Fb and the feeder line Fc detected by the voltage transformer La, the voltage transformer Lb and the voltage transformer Lc are respectively current Ia, current Ib and current Ic;
the controller CC calculates an active power flow P1 provided by the three-phase bus MB to the three-phase traction network TN according to the three-phase bus voltage Uabc, the three-phase feeder current Ia, the three-phase feeder current Ib and the three-phase feeder current Ic;
the controller CC controls a current transformation device MPC, a current transformation device DPC or an energy storage device ES in the current regulation device PCD according to the active current P1 to utilize the power generation current flowing from the traction network TN to the three-phase bus MB and then returning to the power grid, so that the current returning to the power grid meets the preset requirement.
8. The control method according to claim 7, characterized in that:
if P1 is less than 0, the controller CC judges that the power flow returned to the power grid by the three-phase feeder line Fa, the feeder line Fb and the feeder line Fc is power generation power flow, and controls the converter MPC and the converter DPC in the power flow control device PCD to work and supply power to the three-phase bus u, the bus v and the bus w of the power distribution system; or controlling the converter MPC to charge the energy storage device ES, wherein the sum of the power generation flows of the converter MPC and the energy storage device ES is equal to | P1|, so that the power generation flow returned to the power grid =0, and the preset requirement is met;
if the P1 is greater than 0, the controller CC judges that the three-phase feeder line Fa, the feeder line Fb and the feeder line Fc are in a traction working condition, controls an energy storage device ES in the power flow regulation and control device PCD to supply power to a three-phase bus MB through a converter device MPC, and controls a converter device DPC in the power flow regulation and control device PCD to stand by;
if P1=0, the controller CC determines that the three-phase feeder line Fa, the feeder line Fb and the feeder line Fc are unloaded, and controls the power flow control device PCD to be in standby.
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| CN111361463B (en) * | 2020-03-02 | 2022-09-23 | 株洲中车时代电气股份有限公司 | Flexible bilateral power supply power flow control system of alternating current traction network |
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| CN108923440A (en) * | 2018-09-12 | 2018-11-30 | 西南交通大学 | A kind of negative sequence compensation measure and control device of traction substation group, system and method |
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