CN114336641B - Three-phase power supply ride-through power utilization system and control method - Google Patents
Three-phase power supply ride-through power utilization system and control method Download PDFInfo
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- CN114336641B CN114336641B CN202210261864.3A CN202210261864A CN114336641B CN 114336641 B CN114336641 B CN 114336641B CN 202210261864 A CN202210261864 A CN 202210261864A CN 114336641 B CN114336641 B CN 114336641B
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Abstract
The invention provides a three-phase power supply ride-through power utilization system and a control method, and relates to the field of traction power supply system circuit design. The system comprises a power conversion device PCD1 and a controller CC1 which are arranged on a main substation MS1, a power conversion device PCD2 and a controller CC2 which are arranged on a main substation MS2, and a three-phase bilateral cable TC is adopted between the main substation MS1 and the main substation MS2 to supply power to a traction network TN; the controller CC1 is used for acquiring power information of the main substation MS1 in real time, and the controller CC2 is used for acquiring power information of the main substation MS2 in real time; the controller CC1 and the controller CC2 perform information interaction on the OFL through an optical fiber, the controller CC1 controls the power conversion device PCD1 to utilize the traversing power according to the information interaction result or the controller CC2 controls the power conversion device PCD2 to utilize the traversing power according to the information interaction result, so that the traversing power returned to the power grid meets the preset requirement.
Description
Technical Field
The invention relates to the field of traction power supply system circuit design, in particular to a three-phase power supply ride-through power utilization system and a control method.
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 of the three-phase power supply and the power grid form a parallel structure, power and current which are parallel to the power grid flow through the three-phase cable, the corresponding power is called through power (the corresponding current is called balanced current), at the moment, the through power 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 power flows into the main transformer of the three-phase cable from the power grid and is in a load (power utilization) state, and the through power flows into the main transformer of the power grid from the three-phase cable and is in a power generation state. The influence of the ride-through power on the power grid and the metering problem cannot be ignored. If the crossing power returns to the power grid, the power generation of the main substation is equivalent, if the crossing power is returned and counted, namely the power consumption of the other main substation is counteracted according to the power generation, the user has no economic loss, if the crossing power is returned to the power grid and the returning is not counted or is counted, the economic loss of the user is caused, under the condition, how to reduce the crossing power by the three-phase power supply or how to utilize the crossing power 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 power consumption benefit is improved.
Some methods for suppressing the cross-over power are proposed, such as chinese patent 1 "a bilateral power supply system for an electrified railway" (grant No. CN 103552488B), and chinese patent 2 "a bilateral power supply method for an electrified railway" (grant No. CN 110126682B), however, these methods are all for a single-phase traction power supply system, and no research is currently made on the aspect of suppressing the cross-over power of three-phase power supply. In addition, in consideration of the problem that the key point of the ride-through power is the power returned to the power grid, the inventor of the application converts the idea and provides a technology for utilizing the three-phase power supply ride-through power of the electrified railway, so that the ride-through power is converted into available power and electric energy, and the power returned to the power grid meets the requirement, even is 0. The system and the control method for utilizing the traversing power of the traction network bilateral power supply are applied on the same day as the application, and the application emphasizes the traversing power utilization technology in single-phase traction power supply and emphasizes the traversing power utilization technology in three-phase traction power supply.
Disclosure of Invention
The invention aims to provide a three-phase power supply ride-through power utilization system which can effectively solve the technical problem of utilizing ride-through power existing between a main substation MS1 and a main substation MS 2.
The invention is realized by the following technical means: a three-phase power supply ride-through power utilization system comprises a power conversion device PCD1 and a controller CC1, wherein the power conversion device PCD1 is arranged on a main substation MS1 and is connected with a three-phase bus MB1 through an alternating current port J1; the three-phase bus MB1 is respectively provided with a voltage transformer Ya1, a voltage transformer Yb1 and a voltage transformer Yc 1; the three-phase feeder line Fa1, the feeder line Fb1 and the feeder line Fc1 are respectively provided with a current transformer La1, a current transformer Lb1 and a current transformer Lc 1; the three-phase feeder line Fd1, the feeder line Fe1 and the feeder line Ff1 are respectively provided with a current transformer Ld1, a current transformer Le1 and a current transformer Lf 1; the measurement ends of the voltage transformer Ya1, the voltage transformer Yb1, the voltage transformer Yc1, the current transformer La1, the current transformer Lb1, the current transformer Lc1, the current transformer Ld1, the current transformer Le1 and the current transformer Lf1 are all connected with the input end of the controller CC 1; the power conversion device PCD2 and the controller CC2 are arranged on a main substation MS2, and the power conversion device PCD2 is connected with a three-phase bus MB2 through an alternating current port J2; the three-phase bus MB2 is respectively provided with a voltage transformer Ya2, a voltage transformer Yb2 and a voltage transformer Yc 2; the three-phase feeder line Fa2, the feeder line Fb2 and the feeder line Fc2 are respectively provided with a current transformer La2, a current transformer Lb2 and a current transformer Lc2, and the three-phase feeder line Fd2, the feeder line Fe2 and the feeder line Ff2 are respectively provided with a current transformer Ld2, a current transformer Le2 and a current transformer Lf 2;
the measurement ends of the voltage transformer Ya2, the voltage transformer Yb2, the voltage transformer Yc2, the current transformer La2, the current transformer Lb2, the current transformer Lc2, the current transformer Ld2, the current transformer Le2 and the current transformer Lf2 are all connected with the input end of the controller CC 2;
the controller CC1 and the controller CC2 are connected with each other through an optical fiber pair OFL and perform information interaction, wherein:
a three-phase bilateral cable TC is adopted between the main substation MS1 and the main substation MS2 to supply power to a traction network TN, the three-phase bilateral cable TC is connected with the 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;
the controller CC1 is used for acquiring power information of the main substation MS1 in real time, and the controller CC2 is used for acquiring power information of the main substation MS2 in real time;
the controller CC1 and the controller CC2 respectively control the power conversion device PCD1 and the power conversion device PCD2 to utilize the ride-through power according to the information interaction result, so that the ride-through power returned to the power grid from the master substation MS1 or the master substation MS2 meets the preset requirement.
The main substation MS1 adopts three-phase power supply, the primary side of the main substation MS1 is connected to a three-phase power grid, the secondary side of the main substation MS1 is connected to a three-phase bus MB1, the three-phase bus MB1 supplies power to a three-phase bilateral cable TC through a three-phase feeder Fa1, a feeder Fb1 and a feeder Fc1, the three-phase bus MB1 supplies power to a three-phase bilateral cable TCa in a left adjacent power supply interval through a three-phase feeder Fd1, a feeder Fe1 and a feeder Ff1, and the three-phase bilateral cable TCa in the left adjacent power supply interval supplies power to a traction network TN through one or more transformers.
The main substation MS2 adopts three-phase power supply, the primary side of the main substation MS2 is connected to a three-phase power grid, the secondary side of the main substation MS2 is connected with a three-phase bus MB2, the three-phase bus MB2 supplies power to a three-phase bilateral cable TC through a three-phase feeder Fa2, a feeder Fb2 and a feeder Fc2, and the three-phase bus MB2 supplies power to a three-phase bilateral cable TCb in a right adjacent power supply interval through a three-phase feeder Fd2, a feeder Fe2 and a feeder Ff 2; and the three-phase bilateral cable TCb in the right adjacent power supply interval supplies power to the traction network TN through one or more transformers.
The power conversion device PCD1 comprises an inverter MPC1, an inverter DPC1, an energy storage device ES1, a positive bus PB1 and a negative bus NB 1; the converter MPC1 is a three-phase converter system, and the AC side of the converter system is respectively connected with a three-phase bus MB1 through an AC port J1; the converter DPC1 is a three-phase converter system, and the AC side of the converter system is respectively connected with the three phases of a bus a, a bus b and a bus c of a distribution system of a substation; the positive electrode and the negative electrode of the direct current side of the converter MPC1, the converter DPC1 and the energy storage device ES1 are respectively connected with the corresponding positive electrode bus PB1 and the negative electrode bus NB 1; a control terminal of the controller CC1 is connected to a control terminal of the power conversion device PCD 1.
The power conversion device PCD2 comprises an inverter MPC2, an inverter DPC2, an energy storage device ES2, a positive bus PB2 and a negative bus NB 2; the converter MPC2 is a three-phase converter system, and the AC side of the converter system is respectively connected with a three-phase bus MB2 through an AC port J2; the converter DPC2 is a three-phase converter system, and the alternating current side of the converter system is respectively connected with the three phases of a bus u, a bus v and a bus w of a distribution system of a substation; the direct-current side positive electrode and the direct-current side negative electrode of the converter MPC2, the converter DPC2 and the energy storage device ES2 are respectively connected with the corresponding positive electrode bus PB2 and the corresponding negative electrode bus NB 2; a control terminal of the controller CC2 is connected to a control terminal of the power conversion device PCD 2.
A second object of the present invention is to provide a control method based on the above three-phase power supply ride-through power utilization system, the method includes:
the controller CC1 and the controller CC2 respectively acquire real-time power information of a main substation MS1 and a main substation MS 2;
the controller CC1 and the controller CC2 perform information interaction according to the acquired real-time power information;
the controller CC1 controls the power conversion device PCD1 to utilize the through power according to the information interaction result; or the controller CC2 controls the power conversion device PCD2 to utilize the cross power according to the information interaction result, so that the cross power returned from the main substation MS1 to the grid or the cross power returned from the main substation MS2 to the grid meets the preset requirement.
The main substation MS1 and the main substation MS2 both adopt three-phase power supply, wherein:
the controller CC1 acquiring the power information of the main substation MS1 in real time comprises the following steps: the controller CC1 detects the voltage Uabc1 of the three-phase bus MB1, the current Ia1, the current Ib1 and the current Ic1 of the three-phase feeder Fa1, the feeder Fb1 and the feeder Fc1, the current Id1, the current Ie1 and the current If1 of the three-phase feeder Fd1, the feeder Fe1 and the feeder Ff1 in real time; the controller CC1 calculates the active power P1 provided by the main substation MS1 to the three-phase bilateral cable TC according to the voltage Uabc1 of the three-phase bus MB1, the current Ia1, the current Ib1 and the current Ic1 of the three-phase feeder, and the controller CC1 calculates the active power P1a provided by the main substation MS1 to the three-phase bilateral cable TCa of the left adjacent power supply section according to the voltage Uabc1 of the three-phase bus MB1, the current Id1, the current Ie1 and the current If 1;
the controller CC2 acquiring the power information of the main substation MS2 in real time comprises the following steps: the controller CC2 detects the voltage Uabc2 of the three-phase bus MB2, the current Ia2, the current Ib2 and the current Ic2 of the three-phase feeder Fa2, the feeder Fb2 and the feeder Fc2, the current Id2, the current Ie2 and the current If2 of the three-phase feeder Fd2, the feeder Fe2 and the feeder Ff2 in real time; the controller CC2 calculates the active power P2 provided by the main substation MS2 to the three-phase bilateral cable TC according to the voltage Uabc2, the current Id2, the current Ie2 and the current If2 of the three-phase bus MB2, and the controller CC2 calculates the active power P2b provided by the main substation MS2 to the three-phase bilateral cable TCb in the right adjacent power supply interval according to the voltage Uabc2, the current Id2, the current Ie2 and the current If2 of the three-phase bus MB 2;
the power flowing to the three-phase bilateral cable of the substation is positive, and the power flowing to the traction substation of the three-phase bilateral cable is negative.
The information interaction between the controller CC1 and the controller CC2 according to the respective acquired real-time power information includes: controller CC1 sends active power P1 and active power P1a data to controller CC2 via fiber pair OFL, and controller CC2 sends active power P2 and active power P2b data to controller CC1 via fiber pair OFL.
The controller CC1 controls the power conversion device PCD1 to utilize the crossing power according to the information interaction result, the controller CC2 controls the power conversion device PCD2 to utilize the crossing power according to the information interaction result, so that the crossing power returned from the main substation MS1 to the power grid or the crossing power returned from the main substation MS2 to the power grid meets the preset requirement, and the method comprises the following steps:
if P1>0 and P2<0, and P1+ P2=0, controller CC1 and controller CC2 determine that the three-phase bilateral cable TC is unloaded; wherein, P1 and P2 are cross power and flow from three-phase feed line Fa1, feed line Fb1 and feed line Fc1 to three-phase feed line Fa2, feed line Fb2 and feed line Fc 2; at this time: if the active power P1 is not less than P2b is not less than 0, the controller CC2 controls the power conversion device PCD2 to supply power to a three-phase bus u, a bus v and a bus w of the power distribution system, or the energy storage device ES2 runs in an energy storage state; when the sum of the two powers = P1-P2b, the controller CC1 controls the power conversion device PCD1 to standby; if the active power P2b is not less than P1, the controller CC2 controls the power conversion device PCD2 to be in standby, and meanwhile the controller CC1 controls the power conversion device PCD1 to be in standby;
if P2>0 and P1<0, and P1+ P2=0, controller CC1 and controller CC2 determine that three-phase bilateral cable TC is unloaded, where P1 and P2 are pass-through power and flow from three-phase feeder Fa2, feeder Fb2, and feeder Fc2 to three-phase feeder Fa1, feeder Fb1, and feeder Fc1, at this time: if the active power P2 is not less than P1a is not less than 0, the controller CC1 controls the power conversion device PCD1 to supply power to the three-phase bus a, the bus b and the bus c of the power distribution system or enables the energy storage device ES1 to operate in an energy storage state; when the sum of the two powers = P2-P1a, the controller CC2 controls the power conversion apparatus PCD2 to standby; if the active power P1a is not less than P2, the controller CC1 controls the power conversion device PCD1 to be in standby, and meanwhile the controller CC2 controls the power conversion device PCD2 to be in standby;
if | P1+ P2| is >0, and P1 is >0 and P2 is >0, and the controller CC1 and the controller CC2 determine that the three-phase bilateral cable TC is in the traction condition, the controller CC1 controls the power conversion device PCD1 to enable the energy storage device ES1 to operate in the discharge state, the discharge power of the energy storage device ES1 is less than or equal to P1, meanwhile, the controller CC2 controls the power conversion device PCD2 to enable the energy storage device ES2 to operate in the discharge state, and the discharge power of the energy storage device ES2 is less than or equal to P2.
The controller CC1 controls the power conversion device PCD1 to utilize the crossing power according to the information interaction result, the controller CC2 controls the power conversion device PCD2 to utilize the crossing power according to the information interaction result, so that the crossing power returned from the main substation MS1 to the power grid or the crossing power returned from the main substation MS2 to the power grid meets the preset requirement, and the method comprises the following steps:
if P1 is less than 0 and P2 is less than 0, controller CC1 and controller CC2 determine that the three-phase bilateral cable TC is in the braking condition, and at the moment: if P1a is less than 0, the controller CC1 controls the power conversion device PCD1 to supply power to the three-phase bus a, the bus b and the bus c of the power distribution system or enables the energy storage device ES1 to operate in an energy storage state; when the sum of the two power is = | P1| + | P1a |, if P1a >0 and P1a < | P1|, the controller CC1 controls the power conversion device PCD1 to supply power to the three-phase bus a, the bus b and the bus c of the power distribution system; alternatively, the energy storage device ES1 is operated in the energy storage state; when the sum of the two powers = | P1| - | P1a |; if P1a is greater than 0 and P1a is greater than or equal to | P1|, the controller CC1 controls the power conversion device PCD1 to be in standby;
if the P2b is less than 0, the controller CC2 controls the power conversion device PCD2 to supply power to the three-phase bus u, the bus v and the bus w of the power distribution system; or, the energy storage device ES2 is operated in the energy storage state, and when the sum of the two powers = | P2| + | P2b |, if P2b >0 and P2b < | P2|, the controller CC2 controls the power conversion device PCD2 to supply power to the three-phase bus u, the bus v, and the bus w of the power distribution system; or, the energy storage device ES2 is operated in the energy storage state, when the sum of the two powers = | P2| - | P2b |; if P2b >0 and P2b ≧ P2|, controller CC2 controls power conversion device PCD1 to stand by.
The working principle of the invention is as follows: the three-phase bilateral cable for three-phase power supply and the power grid form a parallel structure, power and current which are parallel to the power grid flow through the three-phase bilateral cable, and the corresponding power is called ride-through power (the corresponding current is called balanced current). The crossing power flows in from the main transformer at one side of the three-phase power supply system and flows out from the main transformer at the other side, namely the main transformer of the crossing power flowing into the three-phase cable from the power grid is in a load (power utilization) state, and the main transformer of the crossing power flowing into the power grid from the three-phase cable is in a power generation state. Charging current and charging power can also occur in the distributed capacitance of the transmission line, the three-phase bilateral cable and the traction network. The cross-over power flows along the three-phase bilateral cable, belonging to the longitudinal component, while the charging power, like the load, is called the transverse component. When the three-phase bilateral cable is in no-load, the active component of the measured ride-through power can be selected to reflect the ride-through condition, 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 value of the passing power 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 power conversion device is used for storing the ride-through power in the energy storage device or converting the ride-through power into a self-power utilization system of the substation, so that the ride-through power returned 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 ride-through power are stored in the energy storage device or converted into a self-power utilization system of the substation through the power conversion device, so that the power returned to the power grid meets the preset requirement.
Compared with the prior art, the invention has the beneficial effects that:
firstly, under the condition that the three-phase power supply structure of the electrified railway by the power grid is not changed, the crossing power is utilized, the negative influence of the crossing power on the power grid and users is eliminated, and the advantages of three-phase power supply are fully exerted.
And secondly, the utilization of three-phase power supply regenerated energy is facilitated, the direct utilization rate of regenerated braking energy is improved, and the regenerated power and electric energy returned to the power grid can meet the preset requirements and even can be reduced to 0 under the normal condition.
And thirdly, the power conversion device can be connected with the energy storage device and a power distribution system to supply power, and can utilize residual regenerative braking electric energy besides the ride-through power.
Fourthly, the technology is advanced, reliable and easy to implement.
Drawings
Fig. 1 is a schematic diagram of connection relationship between three-phase power supply and a power grid.
FIG. 2 is a schematic view of the present invention.
Fig. 3 is a schematic structural diagram of a PCD1 of the power conversion device of the present invention.
FIG. 4 is a schematic structural diagram of a PCD2 of a power conversion device of the invention
FIG. 5 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
The single-line schematic diagram of the connection relationship between the three-phase power supply and the power grid is shown in fig. 1, and a three-phase double-side cable TC forms a parallel structure with the power grid G through the main substations MS1 and MS2 on two sides. According to the parallel shunt principle, a current component parallel to the power grid G is generated on the three-phase bilateral cable TC, namely, a balanced current, and the passing power is generated, so that the electric quantity charging problem of the railway is influenced. If the primary side electric quantity charging of two primary variable main power stations with three-phase power supply adopts a return reverse metering mode, the problem can be well solved, and if the return non-counting or return positive metering mode is adopted, the additional burden of a railway can be caused. For this purpose,
as shown in fig. 2, the present embodiment provides a three-phase power supply ride-through power utilization system, including a power conversion device PCD1 and a controller CC1, which are disposed in a main substation MS1, and the power conversion device PCD1 is connected to a three-phase bus MB1 through an ac port J1; the three-phase bus MB1 is respectively provided with a voltage transformer Ya1, a voltage transformer Yb1 and a voltage transformer Yc 1; the three-phase feeder line Fa1, the feeder line Fb1 and the feeder line Fc1 are respectively provided with a current transformer La1, a current transformer Lb1 and a current transformer Lc 1; the three-phase feeder line Fd1, the feeder line Fe1 and the feeder line Ff1 are respectively provided with a current transformer Ld1, a current transformer Le1 and a current transformer Lf 1; the measurement ends of the voltage transformer Ya1, the voltage transformer Yb1, the voltage transformer Yc1, the current transformer La1, the current transformer Lb1, the current transformer Lc1, the current transformer Ld1, the current transformer Le1 and the current transformer Lf1 are all connected with the input end of the controller CC 1; the power conversion device PCD2 and the controller CC2 are arranged on a main substation MS2, and the power conversion device PCD2 is connected with a three-phase bus MB2 through an alternating current port J2; the three-phase bus MB2 is respectively provided with a voltage transformer Ya2, a voltage transformer Yb2 and a voltage transformer Yc 2; the three-phase feeder line Fa2, the feeder line Fb2 and the feeder line Fc2 are respectively provided with a current transformer La2, a current transformer Lb2 and a current transformer Lc2, and the three-phase feeder line Fd2, the feeder line Fe2 and the feeder line Ff2 are respectively provided with a current transformer Ld2, a current transformer Le2 and a current transformer Lf 2;
the measurement ends of the voltage transformer Ya2, the voltage transformer Yb2, the voltage transformer Yc2, the current transformer La2, the current transformer Lb2, the current transformer Lc2, the current transformer Ld2, the current transformer Le2 and the current transformer Lf2 are all connected with the input end of the controller CC 2;
the controller CC1 and the controller CC2 are connected with each other through an optical fiber pair OFL and perform information interaction, wherein:
a three-phase bilateral cable TC is adopted between the main substation MS1 and the main substation MS2 to supply power to a traction network TN, the three-phase bilateral cable TC is connected with the 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;
the controller CC1 is used for acquiring power information of the main substation MS1 in real time, and the controller CC2 is used for acquiring power information of the main substation MS2 in real time;
the controller CC1 and the controller CC2 respectively control the power conversion device PCD1 and the power conversion device PCD2 to utilize the ride-through power according to the information interaction result, so that the ride-through power returned to the power grid from the main substation MS1 or the main substation MS2 meets the preset requirement. Here, meeting the preset requirement may mean controlling the cross power returned from the main substation MS1 to the grid or the cross power returned from the main substation MS2 to the grid within a certain range, or may mean making the cross power returned from the main substation MS1 to the grid or the cross power returned from the main substation MS2 to the grid be 0. In addition, the three-phase bilateral cable TCa, the three-phase bilateral cable TC and the three-phase bilateral cable TCb in the left adjacent power supply section and the right adjacent power supply section are all connected with a traction network TN through one or more three-phase traction transformers, and in fig. 1, the three-phase bilateral cable TCa, the three-phase bilateral cable TC and the three-phase bilateral cable TCb in the right adjacent power supply section are indicated by transformers T1, T2, …, Ti, … and TN, wherein n is not less than 3.
In the application scenario of this embodiment, a three-phase bilateral cable TC is used between the main substation MS1 and the main substation MS2 for bilateral power supply, and meanwhile, in the background art, chinese patent 1 and chinese patent 2 mentioned above need to connect a reactor in series on the secondary side of the traction transformer of the traction substation to reduce the equalizing current, or a voltage compensation device is added to the traction substation to implement voltage phase compensation to reduce the voltage difference output by two traction substations for bilateral power supply, which is not mandatory in this embodiment, that is, this embodiment may use these two measures or may not use these two measures, and the core of this embodiment lies in utilizing the crossing power or the power of the return substation with crossing power, and emphasizing the processing after the result of the occurrence of crossing power rather than inhibiting the generation of crossing power, which is in addition to the three-phase power supply, in addition, on the basis of the technical concept of utilizing the ride through power, in an actual working condition, the regenerative power generated during train braking may return to the substation together with the original ride through power, so that the utilization of the ride through power in the embodiment may also mean that the power of a return substation containing the ride through power is utilized, and the ride through power returned from the main substation MS1 to the power grid or the ride through power returned from the main substation MS2 to the power grid meets preset requirements by utilizing the ride through power, so that negative effects of the ride through power on the power grid and users are eliminated, and the advantage of bilateral power supply is fully exerted. In addition, the traction network TN described in this embodiment provides electric energy to the train through the three-phase contact current-receiving network may mean that the train receives power from the traction network TN through a three-phase current-receiving device, and the three-phase current-receiving device may refer to a related patent technical scheme applied by the inventor team.
Preferably, the main substation MS1 in this embodiment adopts three-phase power supply, the primary side of the main substation MS1 is connected to a three-phase power grid, the secondary side is connected to a three-phase bus MB1, the three-phase bus MB1 supplies power to a three-phase bilateral cable TC through a three-phase feeder Fa1, a feeder Fb1, and a feeder Fc1, the three-phase bus MB1 supplies power to a three-phase bilateral cable TCa in a left adjacent power supply section through a three-phase feeder Fd1, a feeder Fe1, and a feeder Ff1, respectively, and the three-phase bilateral cable TCa in the left adjacent power supply section supplies power to the traction grid TN through one or more transformers.
Preferably, in this embodiment, a main substation MS2 adopts three-phase power supply, a primary side of the main substation MS2 is connected to a three-phase power grid, a secondary side of the main substation MS2 is connected to a three-phase bus MB2, the three-phase bus MB2 supplies power to a three-phase bilateral cable TC through a three-phase feeder Fa2, a feeder Fb2 and a feeder Fc2, and the three-phase bus MB2 supplies power to a three-phase bilateral cable TCb in a right-adjacent power supply interval through a three-phase feeder Fd2, a feeder Fe2 and a feeder Ff 2; and the three-phase bilateral cable TCb in the right adjacent power supply interval supplies power to the traction network TN through one or more transformers.
Preferably, as shown in fig. 3, the power conversion device PCD1 of the present embodiment includes an inverter MPC1, an inverter DPC1, an energy storage device ES1, a positive bus PB1, and a negative bus NB 1; the converter MPC1 is a three-phase converter system, and the AC side of the converter system is respectively connected with a three-phase bus MB1 through an AC port J1; the converter DPC1 is a three-phase converter system, and the AC side of the converter system is respectively connected with the three phases of a bus a, a bus b and a bus c of a distribution system of a substation; the positive electrode and the negative electrode of the direct current side of the converter MPC1, the converter DPC1 and the energy storage device ES1 are respectively connected with the corresponding positive electrode bus PB1 and the negative electrode bus NB 1; a control terminal of the controller CC1 is connected to a control terminal of the power conversion device PCD 1.
Here, when the ride-through power or the return power including the ride-through power flows to the main substation MS1, the controller CC1 may control the energy storage device ES1 to store the ride-through power or the return power including the ride-through power flowing to the main substation MS1, and may also control the ride-through power or the return power including the ride-through power flowing to the main substation MS1 to flow to the distribution system three-phase bus abc to be utilized by the distribution system related electrical devices, so that the ride-through power returning from the main substation MS1 to the grid meets the preset requirement.
Preferably, as shown in fig. 4, the power conversion device PCD2 of the present embodiment includes an inverter MPC2, an inverter DPC2, an energy storage device ES2, a positive bus PB2, and a negative bus NB 2; the converter MPC2 is a three-phase converter system, and the AC side of the converter system is respectively connected with a three-phase bus MB2 through an AC port J2; the converter DPC2 is a three-phase converter system, and the alternating current side of the converter system is respectively connected with the three phases of a bus u, a bus v and a bus w of a distribution system of a substation; the direct-current side positive electrode and the direct-current side negative electrode of the converter MPC2, the converter DPC2 and the energy storage device ES2 are respectively connected with the corresponding positive electrode bus PB2 and the corresponding negative electrode bus NB 2; a control terminal of the controller CC2 is connected to a control terminal of the power conversion device PCD 2.
Here, when the cross power or the return power including the cross power flows to the main substation MS2, the controller CC2 may control the energy storage device ES2 to store the cross power or the return power including the cross power flowing to the main substation MS2, and may also control the cross power or the return power including the cross power flowing to the main substation MS2 to flow to the three-phase bus u, the bus v, and the bus w of the power distribution system to be utilized by the electrical devices related to the power distribution system, so that the cross power returning to the power grid from the main substation MS2 satisfies a preset requirement.
Example 2
As shown in fig. 5, this embodiment provides a control method for a system for bilateral power supply cross-over of a traction network provided in embodiment 1, including:
step S100: the controller CC1 and the controller CC2 respectively acquire real-time power information of a main substation MS1 and a main substation MS 2;
step S200: the controller CC1 and the controller CC2 perform information interaction according to the acquired real-time power information;
step S300: the controller CC1 controls the power conversion device PCD1 to utilize the traversing power according to the information interaction result; or the controller CC2 controls the power conversion device PCD2 to utilize the cross power according to the information interaction result, so that the cross power returned from the main substation MS1 to the grid or the cross power returned from the main substation MS2 to the grid meets the preset requirement.
Preferably, the main substation MS1 and the main substation MS2 both use three-phase power supply, and the method comprises the following steps:
the controller CC1 and the controller CC2 respectively obtain the real-time power information of the main substation MS1 and the main substation MS2, that is, step S100 includes:
the controller CC1 detects the voltage Uabc1 of the three-phase bus MB1, the current Ia1, the current Ib1 and the current Ic1 of the three-phase feeder Fa1, the feeder Fb1 and the feeder Fc1, the current Id1, the current Ie1 and the current If1 of the three-phase feeder Fd1, the feeder Fe1 and the feeder Ff1 in real time; the controller CC1 calculates the active power P1 provided by the main substation MS1 to the three-phase bilateral cable TC according to the voltage Uabc1 of the three-phase bus MB1, the current Ia1, the current Ib1 and the current Ic1 of the three-phase feeder, and the controller CC1 calculates the active power P1a provided by the main substation MS1 to the three-phase bilateral cable TCa of the left adjacent power supply section according to the voltage Uabc1 of the three-phase bus MB1, the current Id1, the current Ie1 and the current If 1;
the controller CC2 acquires the power information of the main substation MS2 in real time, including: the controller CC2 detects the voltage Uabc2 of the three-phase bus MB2, the current Ia2, the current Ib2 and the current Ic2 of the three-phase feeder Fa2, the feeder Fb2 and the feeder Fc2, the current Id2, the current Ie2 and the current If2 of the three-phase feeder Fd2, the feeder Fe2 and the feeder Ff2 in real time; the controller CC2 calculates the active power P2 provided by the main substation MS2 to the three-phase bilateral cable TC according to the voltage Uabc2, the current Id2, the current Ie2 and the current If2 of the three-phase bus MB2, and the controller CC2 calculates the active power P2b provided by the main substation MS2 to the three-phase bilateral cable TCb in the right adjacent power supply section according to the voltage Uabc2, the current Id2, the current Ie2 and the current If2 of the three-phase bus MB 2;
the power flowing to the three-phase bilateral cable of the substation is positive, and the power flowing to the traction substation of the three-phase bilateral cable is negative.
Here, the fact that the power flowing to the three-phase bilateral cable of the main substation is positive not only means that the power flowing to the three-phase bilateral cable TC or the three-phase bilateral cable TCa in the left adjacent power supply section by the main substation MS1 is positive, but also means that the power flowing to the three-phase bilateral cable TC or the three-phase bilateral cable TCb in the right adjacent power supply section by the main substation MS2 is positive; the fact that the power flowing to the main substation by the three-phase bilateral cable is negative not only means that the power flowing to the main substation MS1 by the three-phase bilateral cable TC or the three-phase bilateral cable TCa in the left adjacent power supply section is negative, but also means that the power flowing to the main substation MS2 by the three-phase bilateral cable TC or the three-phase bilateral cable TCb in the right adjacent power supply section is negative.
Preferably, the controller CC1 and the controller CC2 perform information interaction according to the respective acquired real-time power information, that is, step S200 includes: controller CC1 sends active power P1 and active power P1a data to controller CC2 via fiber pair OFL, and controller CC2 sends active power P2 and active power P2b data to controller CC1 via fiber pair OFL.
Preferably, the controller CC1 controls the power conversion device PCD1 to utilize the cross power according to the information interaction result, and the controller CC2 controls the power conversion device PCD2 to utilize the cross power according to the information interaction result, so that the cross power returned from the main substation MS1 to the grid or the cross power returned from the main substation MS2 to the grid meets the preset requirement, that is, the step S300 includes:
step S301: if P1>0 and P2<0, and P1+ P2=0, controller CC1 and controller CC2 determine that the three-phase bilateral cable TC is unloaded; wherein, P1 and P2 are cross power and flow from three-phase feed line Fa1, feed line Fb1 and feed line Fc1 to three-phase feed line Fa2, feed line Fb2 and feed line Fc 2; at this time: if the active power P1 is not less than P2b is not less than 0, the controller CC2 controls the power conversion device PCD2 to supply power to a three-phase bus u, a bus v and a bus w of the power distribution system, or the energy storage device ES2 runs in an energy storage state; when the sum of the two powers = P1-P2b, the controller CC1 controls the power conversion device PCD1 to standby; if the active power P2b is not less than P1, the controller CC2 controls the power conversion device PCD2 to be in standby, and meanwhile the controller CC1 controls the power conversion device PCD1 to be in standby;
step S302: if P2>0 and P1<0, and P1+ P2=0, controller CC1 and controller CC2 determine that three-phase bilateral cable TC is unloaded, where P1 and P2 are pass-through power and flow from three-phase feeder Fa2, feeder Fb2, and feeder Fc2 to three-phase feeder Fa1, feeder Fb1, and feeder Fc1, at this time: if the active power P2 is not less than P1a is not less than 0, the controller CC1 controls the power conversion device PCD1 to supply power to the three-phase bus a, the bus b and the bus c of the power distribution system or enables the energy storage device ES1 to operate in an energy storage state; when the sum of the two powers = P2-P1a, the controller CC2 controls the power conversion device PCD2 to standby; if the active power P1a is not less than P2, the controller CC1 controls the power conversion device PCD1 to be standby, and meanwhile the controller CC2 controls the power conversion device PCD2 to be standby;
step S303: if | P1+ P2| is >0, and P1 is >0 and P2 is >0, and the controller CC1 and the controller CC2 determine that the three-phase bilateral cable TC is in the traction condition, the controller CC1 controls the power conversion device PCD1 to enable the energy storage device ES1 to operate in the discharge state, the discharge power of the energy storage device ES1 is less than or equal to P1, meanwhile, the controller CC2 controls the power conversion device PCD2 to enable the energy storage device ES2 to operate in the discharge state, and the discharge power of the energy storage device ES2 is less than or equal to P2.
Preferably, the controller CC1 controls the power conversion device PCD1 to utilize the cross power according to the information interaction result, and the controller CC2 controls the power conversion device PCD2 to utilize the cross power according to the information interaction result, so that the cross power returned from the main substation MS1 to the power grid or the cross power returned from the main substation MS2 to the power grid meets the preset requirement, that is, the step S300 further includes:
step S304: if P1 is less than 0 and P2 is less than 0, controller CC1 and controller CC2 determine that the three-phase bilateral cable TC is in the braking condition, and at the moment:
step S304-1: if P1a is less than 0, the controller CC1 controls the power conversion device PCD1 to supply power to the three-phase bus a, the bus b and the bus c of the power distribution system or enables the energy storage device ES1 to operate in an energy storage state; when the sum of the two power is = | P1| + | P1a |, if P1a >0 and P1a < | P1|, the controller CC1 controls the power conversion device PCD1 to supply power to the three-phase bus a, the bus b and the bus c of the power distribution system; alternatively, the energy storage device ES1 is operated in the energy storage state; when the sum of the two powers = | P1| - | P1a |; if P1a is greater than 0 and P1a is greater than or equal to | P1|, the controller CC1 controls the power conversion device PCD1 to be in standby;
step S304-2: if the P2b is less than 0, the controller CC2 controls the power conversion device PCD2 to supply power to the three-phase bus u, the bus v and the bus w of the power distribution system; or, the energy storage device ES2 is operated in the energy storage state, and when the sum of the two powers = | P2| + | P2b |, if P2b >0 and P2b < | P2|, the controller CC2 controls the power conversion device PCD2 to supply power to the three-phase bus u, the bus v, and the bus w of the power distribution system; or, the energy storage device ES2 is operated in the energy storage state, when the sum of the two powers = | P2| - | P2b |; if P2b >0 and P2b ≧ P2|, controller CC2 controls power conversion device PCD1 to stand by.
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 (13)
1. A three-phase power supply ride-through power utilization system is characterized in that: the power conversion device PCD1 is connected with a three-phase bus MB1 through an alternating current port J1; the power conversion device PCD2 and the controller CC2 are arranged on a main substation MS2, and the power conversion device PCD2 is connected with a three-phase bus MB2 through an alternating current port J2; the secondary sides of the main substations MS1 and MS2 are respectively connected with three-phase buses MB1 and MB2, the three-phase bus MB1 supplies power to a three-phase bilateral cable TCa and a three-phase bilateral cable TC in a left adjacent power supply interval, the three-phase bus MB2 supplies power to the three-phase bilateral cable TC and a three-phase bilateral cable TCb in a right adjacent power supply interval, and the three-phase bilateral cable TCa, the three-phase bilateral cable TC and the three-phase bilateral cable TCb in the left adjacent power supply interval all supply power to the traction network TN;
the controller CC1 and the controller CC2 are connected with the OFL through an optical fiber pair and carry out information interaction;
the controller CC1 is used for acquiring power information of the main substation MS1 in real time, and the controller CC2 is used for acquiring power information of the main substation MS2 in real time;
the controller CC1 and the controller CC2 respectively control the power conversion device PCD1 and the power conversion device PCD2 to utilize the ride-through power by supplying power or storing energy to the power distribution system according to the information interaction result, so that the ride-through power returned to the power grid from the main substation MS1 or the main substation MS2 meets the preset requirement.
2. The three-phase power supply ride-through power utilization system according to claim 1, wherein the main substation MS1 adopts three-phase power supply, the primary side of the main substation MS1 is connected to a three-phase power grid, a three-phase bus MB1 supplies power to a three-phase bilateral cable TC through a three-phase feeder Fa1, a feeder Fb1 and a feeder Fc1, and the three-phase bus MB1 supplies power to a three-phase bilateral cable TCa in a left adjacent power supply interval through a three-phase feeder Fd1, a feeder Fe1 and a feeder Ff1 respectively.
3. The three-phase power supply ride-through power utilization system according to claim 1, wherein the main substation MS2 adopts three-phase power supply, the primary side of the main substation MS2 is connected to a three-phase power grid, a three-phase bus MB2 supplies power to a three-phase bilateral cable TC through a three-phase feeder Fa2, a feeder Fb2 and a feeder Fc2, and the three-phase bus MB2 supplies power to a three-phase bilateral cable TCb in a right adjacent power supply interval through a three-phase feeder Fd2, a feeder Fe2 and a feeder Ff2 respectively.
4. A three-phase power supply ride-through power utilization system according to claim 1, wherein: the power conversion device PCD1 comprises an inverter MPC1, an inverter DPC1, an energy storage device ES1, a positive bus PB1 and a negative bus NB 1; the converter MPC1 is a three-phase converter system, and the AC side of the converter system is respectively connected with a three-phase bus MB1 through an AC port J1; the converter DPC1 is a three-phase converter system, and the AC side of the converter system is respectively connected with the three phases of a bus a, a bus b and a bus c of a distribution system of a substation; the positive electrode and the negative electrode of the direct current side of each of the converter device MPC1, the converter device DPC1 and the energy storage device ES1 are respectively connected with the corresponding positive electrode bus PB1 and the corresponding negative electrode bus NB 1; a control terminal of the controller CC1 is connected to a control terminal of the power conversion device PCD 1.
5. A three-phase power supply ride-through power utilization system according to claim 1, wherein: the power conversion device PCD2 comprises an inverter MPC2, an inverter DPC2, an energy storage device ES2, a positive bus PB2 and a negative bus NB 2; the converter MPC2 is a three-phase converter system, and the AC side of the converter system is respectively connected with a three-phase bus MB2 through an AC port J2; the converter DPC2 is a three-phase converter system, and the alternating current side of the converter system is respectively connected with the three phases of a bus u, a bus v and a bus w of a distribution system of a substation; the direct-current side positive electrode and the direct-current side negative electrode of the converter MPC2, the converter DPC2 and the energy storage device ES2 are respectively connected with the corresponding positive electrode bus PB2 and the corresponding negative electrode bus NB 2; a control terminal of the controller CC2 is connected to a control terminal of the power conversion device PCD 2.
6. The three-phase power supply ride-through power utilization system according to claim 2, wherein the three-phase bus MB1 is respectively provided with a voltage transformer Ya1, a voltage transformer Yb1 and a voltage transformer Yc 1; the three-phase feeder line Fa1, the feeder line Fb1 and the feeder line Fc1 are respectively provided with a current transformer La1, a current transformer Lb1 and a current transformer Lc 1; the three-phase feeder line Fd1, the feeder line Fe1 and the feeder line Ff1 are respectively provided with a current transformer Ld1, a current transformer Le1 and a current transformer Lf 1;
the measurement ends of the voltage transformer Ya1, the voltage transformer Yb1, the voltage transformer Yc1, the current transformer La1, the current transformer Lb1, the current transformer Lc1, the current transformer Ld1, the current transformer Le1 and the current transformer Lf1 are all connected with the input end of the controller CC 1.
7. The three-phase power supply ride-through power utilization system according to claim 3, wherein the three-phase bus MB2 is respectively provided with a voltage transformer Ya2, a voltage transformer Yb2 and a voltage transformer Yc 2; the three-phase feeder line Fa2, the feeder line Fb2 and the feeder line Fc2 are respectively provided with a current transformer La2, a current transformer Lb2 and a current transformer Lc2, and the three-phase feeder line Fd2, the feeder line Fe2 and the feeder line Ff2 are respectively provided with a current transformer Ld2, a current transformer Le2 and a current transformer Lf 2;
the measurement ends of the voltage transformer Ya2, the voltage transformer Yb2, the voltage transformer Yc2, the current transformer La2, the current transformer Lb2, the current transformer Lc2, the current transformer Ld2, the current transformer Le2 and the current transformer Lf2 are all connected with the input end of the controller CC 2.
8. The three-phase power supply ride-through power utilization system according to any one of claims 1 to 7, wherein the three-phase bilateral cable TCa in the left adjacent power supply section supplies power to the traction network TN through one or more transformers, the three-phase bilateral cable TCb in the right adjacent power supply section supplies power to the traction network TN through one or more transformers, the three-phase bilateral cable TC is connected with the traction network TN through one or more three-phase traction transformers, and the traction network TN is supplied with power to the train through a three-phase contact mode.
9. A control method for a three-phase power supply ride-through power utilization system according to any one of claims 1 to 8, comprising:
the controller CC1 and the controller CC2 respectively acquire real-time power information of a main substation MS1 and a main substation MS 2;
the controller CC1 and the controller CC2 perform information interaction according to the acquired real-time power information;
the controller CC1 controls the power conversion device PCD1 to utilize the through power according to the information interaction result;
or the controller CC2 controls the power conversion device PCD2 to utilize the cross power according to the information interaction result, so that the cross power returned from the main substation MS1 to the grid or the cross power returned from the main substation MS2 to the grid meets the preset requirement.
10. The control method according to claim 9, characterized in that: the main substation MS1 and the main substation MS2 both adopt three-phase power supply, wherein: the controller CC1 acquiring the power information of the main substation MS1 in real time comprises the following steps: the controller CC1 detects the voltage Uabc1 of a three-phase bus MB1 of a main substation MS1, the current Ia1 of a three-phase feeder Fa1, a feeder Fb1 and a feeder Fc1, the current Ib1 and the current Ic1, the current Id1 of a three-phase feeder Fd1, a feeder Fe1 and a feeder Ff1, the current Ie1 and the current If1 in real time; the controller CC1 calculates the active power P1 provided by the main substation MS1 to the three-phase bilateral cable TC according to the voltage Uabc1 of the three-phase bus MB1, the current Ia1, the current Ib1 and the current Ic1 of the three-phase feeder, and the controller CC1 calculates the active power P1a provided by the main substation MS1 to the three-phase bilateral cable TCa of the left adjacent power supply section according to the voltage Uabc1 of the three-phase bus MB1, the current Id1, the current Ie1 and the current If 1;
the controller CC2 acquiring the power information of the main substation MS2 in real time comprises the following steps: the controller CC2 detects the voltage Uabc2 of a three-phase bus MB2 of a main substation MS2, the current Ia2 of a three-phase feeder Fa2, a feeder Fb2 and a feeder Fc2, the current Ib2 and the current Ic2, the current Id2 of a three-phase feeder Fd2, a feeder Fe2 and a feeder Ff2, the current Ie2 and the current If2 in real time; the controller CC2 calculates the active power P2 provided by the main substation MS2 to the three-phase bilateral cable TC according to the voltage Uabc2, the current Id2, the current Ie2 and the current If2 of the three-phase bus MB2, and the controller CC2 calculates the active power P2b provided by the main substation MS2 to the three-phase bilateral cable TCb in the right adjacent power supply section according to the voltage Uabc2, the current Id2, the current Ie2 and the current If2 of the three-phase bus MB 2;
the power flowing to the three-phase bilateral cable of the substation is positive, and the power flowing to the traction substation of the three-phase bilateral cable is negative.
11. The control method according to claim 10, characterized in that: the information interaction between the controller CC1 and the controller CC2 according to the respective acquired real-time power information includes: controller CC1 sends data of active power P1 and active power P1a to controller CC2 through optical fiber pair OFL, and controller CC2 sends data of active power P2 and active power P2b to controller CC1 through optical fiber pair OFL.
12. The control method according to claim 10 or 11, characterized in that: the controller CC1 controls the power conversion device PCD1 to utilize the crossing power according to the information interaction result, the controller CC2 controls the power conversion device PCD2 to utilize the crossing power according to the information interaction result, so that the crossing power returned from the main substation MS1 to the power grid or the crossing power returned from the main substation MS2 to the power grid meets the preset requirement, and the method comprises the following steps:
if P1>0 and P2<0, and P1+ P2=0, controller CC1 and controller CC2 determine that the three-phase bilateral cable TC is unloaded; in the formula, P1 and P2 are crossing power and flow from three-phase feed line Fa1, feed line Fb1 and feed line Fc1 to three-phase feed line Fa2, feed line Fb2 and feed line Fc 2; at this time: if the active power P1 is not less than P2b is not less than 0, the controller CC2 controls the power conversion device PCD2 to supply power to a three-phase bus u, a bus v and a bus w of the power distribution system, or the energy storage device ES2 runs in an energy storage state; when the sum of power supplied to the three-phase buses u, v and w of the power distribution system and the power of the energy storage device ES 2= P1-P2b, the controller CC1 controls the power conversion device PCD1 to be in standby; if the active power P2b is not less than P1, the controller CC2 controls the power conversion device PCD2 to be in standby, and meanwhile the controller CC1 controls the power conversion device PCD1 to be in standby;
if P2>0 and P1<0, and P1+ P2=0, controller CC1 and controller CC2 determine that three-phase bilateral cable TC is unloaded, where P1 and P2 are the pass-through power and flow from three-phase feeder Fa2, feeder Fb2, and feeder Fc2 to three-phase feeder Fa1, feeder Fb1, and feeder Fc1, where: if the active power P2 is not less than P1a is not less than 0, the controller CC1 controls the power conversion device PCD1 to supply power to the three-phase bus a, the bus b and the bus c of the power distribution system or enables the energy storage device ES1 to operate in an energy storage state; when the sum of the power supplied to the three-phase buses a, b and c of the power distribution system and the power of the energy storage device ES1 = P2-P1a, the controller CC2 controls the power conversion device PCD2 to be in standby; if the active power P1a is not less than P2, the controller CC1 controls the power conversion device PCD1 to be in standby, and meanwhile the controller CC2 controls the power conversion device PCD2 to be in standby;
if | P1+ P2| is >0, and P1 is >0 and P2 is >0, and the controller CC1 and the controller CC2 determine that the three-phase bilateral cable TC is in the traction condition, the controller CC1 controls the power conversion device PCD1 to enable the energy storage device ES1 to operate in the discharge state, the discharge power of the energy storage device ES1 is less than or equal to P1, meanwhile, the controller CC2 controls the power conversion device PCD2 to enable the energy storage device ES2 to operate in the discharge state, and the discharge power of the energy storage device ES2 is less than or equal to P2.
13. The control method according to claim 10 or 11, characterized in that: the controller CC1 controls the power conversion device PCD1 to utilize the crossing power according to the information interaction result, the controller CC2 controls the power conversion device PCD2 to utilize the crossing power according to the information interaction result, so that the crossing power returned from the main substation MS1 to the power grid or the crossing power returned from the main substation MS2 to the power grid meets the preset requirement, and the method comprises the following steps:
if P1 is less than 0 and P2 is less than 0, controller CC1 and controller CC2 determine that the three-phase bilateral cable TC is in the braking condition, and at the moment: if P1a is less than 0, the controller CC1 controls the power conversion device PCD1 to supply power to the three-phase bus a, the bus b and the bus c of the power distribution system or enable the energy storage device ES1 to operate in an energy storage state, and the sum of the power supplied to the three-phase bus a, the bus b and the bus c of the power distribution system and the power of the energy storage device ES1 = | P1| + | P1a |; if P1a is greater than 0 and P1a < | P1|, the controller CC1 controls the power conversion device PCD1 to supply power to the three-phase bus a, the bus b and the bus c of the power distribution system or enables the energy storage device ES1 to operate in an energy storage state, and the sum of the power supplied to the three-phase bus a, the bus b and the bus c of the power distribution system and the power of the energy storage device ES1 = | P1| - | P1a |; if the P1a is greater than 0 and the P1a is greater than or equal to | P1|, the controller CC1 controls the power conversion device PCD1 to be in a standby state;
if P2b is less than 0, the controller CC2 controls the power conversion device PCD2 to supply power to the three-phase bus u, the bus v and the bus w of the power distribution system or enable the energy storage device ES2 to operate in an energy storage state, and the sum of the power supplied to the three-phase bus u, v and w of the power distribution system and the power of the energy storage device ES 2= | P2| + | P2b |; if P2b is greater than 0 and P2b < | P2|, the controller CC2 controls the power conversion device PCD2 to supply power to the three-phase bus u, bus v and bus w of the power distribution system or enables the energy storage device ES2 to operate in an energy storage state, and the sum of the power supplied to the three-phase bus u, v and w of the power distribution system and the power of the energy storage device ES 2= | P2| - | P2b |; if P2b >0 and P2b ≧ P2|, controller CC2 controls power conversion device PCD1 to stand by.
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