CN109936135B - In-phase energy storage and power supply device of electrified railway and control method thereof - Google Patents
In-phase energy storage and power supply device of electrified railway and control method thereof Download PDFInfo
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Abstract
The invention discloses an electrified railway in-phase energy storage and power supply structure and a control method thereof. The in-phase energy storage power supply structure comprises a three-phase traction transformer, a three-phase matching transformer, a plurality of energy storage compensation devices and a coordination control device, wherein the primary side of the three-phase traction transformer is connected with a three-phase power system, and the secondary side terminal is connected with a traction load; the primary side of the three-phase matching transformer is connected with the secondary side of the three-phase traction transformer; alternating-current ends of the energy storage compensation devices are respectively connected with secondary sides of the three-phase matching transformers; the input end of the coordination control device is respectively connected with the secondary side of the load feeder current transformer and the secondary side of the load bus voltage transformer, and the bidirectional signal ports of the coordination control device are respectively connected with the bidirectional signal ports of the energy storage compensation devices. A control method is also disclosed. Therefore, the invention has the functions of implementing in-phase and energy storage, not only optimizes the economic and energy-saving operation of the traction substation of the electrified railway, but also achieves the peak elimination of traction load, reduces the operation cost and effectively utilizes the regenerative braking energy of the train.
Description
Technical Field
The invention relates to the technical field of electrified railway power supply.
Background
The train can generate great regenerative braking energy in the braking process, the in-phase power supply technology cancels the electric split phase of the traction substation, prolongs the length of the power supply arm, and is beneficial to the utilization of the regenerative braking energy. However, when the total regenerative braking energy in the power supply arm is greater than the traction energy, the regenerative braking energy cannot be fully utilized, or the driving density is low, and when the trains in traction and regenerative braking conditions in the same power supply arm cannot simultaneously appear, the regenerative braking energy cannot be utilized.
The traction load of the electrified railway fluctuates severely, the instantaneous maximum value of the power reaches 5-10 times of the average value, the ubiquitous load rate of the traction transformer is low, the utilization efficiency of traction power supply system equipment is low, and the running cost is high. Peak clipping and valley filling are important management measures for electric loads, traction load fluctuation can be alleviated, and pressure brought by peak power to systems and equipment can be relieved. The energy storage device has an energy transfer function, namely, discharges at the time of load peak and charges at the time of load valley. The characteristics of peak clipping and valley filling of the energy storage device are utilized, so that the utilization rate of the power transformation equipment is improved, the capacity expansion and updating cost of the equipment is saved, and the traction power supply cost is reduced. Meanwhile, the peak value period of the traction load power shows the maximum voltage unbalance degree (negative sequence current), and the load is balanced through the peak clipping of the energy storage device, so that the voltage unbalance degree (negative sequence current) can be reduced, and the negative sequence effect is improved.
The modern energy industry system with clean low carbon, safety and high efficiency is advocated to be constructed, the production and utilization modes of the pushing energy are encouraged to change, and policy support is provided for the application of the current electrified railway energy storage technology.
Based on the factors, the same-phase energy storage power supply device and the control method of the electrified railway are provided for further optimizing the economic energy-saving operation of the traction substation of the electrified railway. The subject group applies for patent 'an electrified railway energy storage in-phase power supply device and a control method thereof' in 2017, 7 and 5 days (application publication number: CN 107104444A), discloses an electrified railway energy storage in-phase power supply device, adopts a single-phase back-to-back converter and energy storage structure, and discloses a peak clipping and valley filling real-time control strategy and a negative sequence control strategy thereof. The invention is based on a three-phase-to-direct current converter, a DC/DC converter and an energy accumulator, has essential differences in construction, adopts a classification and grouping structure, and is convenient for expansion according to needs. In the control method, the invention provides charge and discharge control and electric energy quality compensation control according to the functional interval classification, which is beneficial to improving the utilization rate of regenerative braking energy and the capacity utilization rate of the energy storage device.
Disclosure of Invention
The invention aims to provide an electrified railway in-phase energy storage power supply device and a control method thereof, which can effectively solve the technical problems of traction load peak elimination and train regeneration braking energy utilization.
In order to realize the technical problems to be solved, the invention adopts the following technical scheme:
an in-phase energy storage and power supply device for an electrified railway, the in-phase energy storage and power supply device comprising:
the three-phase traction transformer TT is used for transmitting line voltage of a three-phase power system to a traction bus, the primary side of the three-phase traction transformer TT is connected with the three-phase power system, and any two terminals on the secondary side of the three-phase traction transformer TT are connected with a traction load TL;
the three-phase matching transformer MT is used for voltage matching and electric isolation of the energy storage compensation device, and the primary side of the three-phase matching transformer MT is connected with the secondary side of the three-phase traction transformer TT;
the energy storage compensation device is used for real-time charge and discharge and/or power quality compensation, and is a first group of energy storage compensation devices EC 1 Second group of energy storage compensation devices EC 2 … … and nth group of energy storage compensation devices EC n And n is a positive integer, the first group of energy storage compensation devices EC 1 Second group of energy storage compensation devices EC 2 … … and nth group of energy storage compensation devices EC n The alternating current ends of the three-phase matching transformer MT are respectively connected with the secondary sides of the three-phase matching transformer MT;
the coordination control device CC is used for detecting the operation condition and the size of the traction load and coordinating the real-time charge and discharge control or/and the electric energy quality control of the energy storage compensation device, and the input end of the coordination control device CC is respectively connected with the secondary side In of the load feeder current transformer 1 And load bus voltage transformer secondary side In 2 The bidirectional signal ports of the first group of energy storage compensation devices EC are respectively connected with the first group of energy storage compensation devices 1 Second group of energy storage compensation devices EC 2 … … and nth group of energy storage compensation devices EC n Is connected to the bidirectional signal port of the circuit.
The first group of energy storage compensation devices EC 1 Comprising a first three-phase intersecting-direct current converter AD which is connected in series in turn 1 First switching power supply DD 1 And a first energy storage unit ES 1 The second group of energy storage compensation devices EC 2 Comprising a second three-phase intersecting-direct current converter AD which is connected in series in turn 2 Second switching power supply DD 2 And a second energy storage unit ES 2 The nth group of energy storage compensation devices EC n Comprising the nth third intersecting-straight connected in seriesCurrent transformer AD n N-th switching power supply DD n And an nth energy storage unit ES n 。
The energy storage compensation device is divided into m groups of power type energy storage compensation devices and n-m groups of energy type energy storage compensation devices, and m is the same as the energy storage compensation device<n; wherein the first energy storage unit ES in the m groups of power type energy storage compensation devices 1 The second energy storage unit ES 2 … … and the mth energy storage unit ES m The power type energy storage compensation device is of m groups of power type; the m+1th energy storage unit ESm +1, the m+2th energy storage unit ESm +2, … … and the n-th energy storage unit ES n The energy storage compensation device is of an energy type and forms n-m groups of energy type.
The three-phase traction transformer TT is provided with a standby three-phase traction transformer TB, the primary side of the standby three-phase traction transformer TB is connected with a three-phase power system, and any two terminals on the secondary side of the standby three-phase traction transformer TB are connected with traction loads; the secondary side of the standby three-phase traction transformer TB is also connected with the primary side of the three-phase matching transformer MT. In order to realize the technical problems to be solved, the invention adopts the following technical scheme:
the control method of the in-phase energy storage and power supply device of the electrified railway according to the technical scheme comprises the following specific steps:
step one, detecting the operation condition and the traction load size of a traction load by adopting a secondary side of a load feeder current transformer and a secondary side of a load bus voltage transformer;
step two, coordinating the first group of energy storage compensation devices EC 1 The second group of energy storage compensation devices EC 2 … … and the nth group of energy storage compensation devices EC n And carrying out charge and discharge control or electric energy quality control in real time. Preferably, the specific method for controlling the charge and discharge in the second step includes the following steps:
adopting a coordination control device CC to count historical daily traction load data, calculating the power average value of the traction load in the whole time period according to a fixed period and slip to obtain a historical daily power demand curve, selecting the maximum demand contract value in the time period, and according to the maximum demand contract value,Judging and dividing a regenerative braking energy utilization control interval and a peak elimination control interval by a power demand curve and the whole time period; when the power demand value of the traction load is smaller than the maximum demand contract value, namely, a section of the power demand curve below the maximum demand contract value is taken as a regeneration braking energy utilization control section, and the section is mainly used for preferentially controlling m groups of power type energy storage compensation devices; when the traction load is detected to run under the traction working condition, the first group of energy storage compensation devices EC are controlled 1 The second group of energy storage compensation devices EC 2 … … and the m-th group energy storage compensation device EC m Discharging; when the traction load is detected to run under the regenerative braking working condition, the first group of energy storage compensation devices EC are controlled 1 The second group of energy storage compensation devices EC 2 … … and the m-th group energy storage compensation device EC m Charging; when the power demand value of the traction load is larger than the maximum demand contract value, namely, a section of the power demand curve above the maximum demand contract value is taken as a peak clipping control section, the section mainly controls n-m groups of energy storage compensation devices to work as priority, and the m+1th group of energy storage compensation devices, the m+2th group of energy storage compensation devices, the … … th group of energy storage compensation devices and the n groups of energy storage compensation devices are controlled to discharge according to peak clipping reference values, so that peak clipping of the traction load is realized.
Further preferably, the specific method for controlling the power quality compensation in the second step includes the following steps:
under the premise of charge and discharge control, calculating a voltage unbalance index of the traction load; when the voltage unbalance index reaches the preset limit value, the first group of energy storage compensation devices EC are controlled 1 The second group of energy storage compensation devices EC 2 … … and the nth group of energy storage compensation devices EC n Is 0; when the voltage unbalance index does not reach the preset limit value, the first group of energy storage compensation devices EC are controlled 1 The second group of energy storage compensation devices EC 2 … … and the nth group of energy storage compensation devices EC n And respectively generating in-phase compensation currents and overlapping the in-phase compensation currents with the charge and discharge control currents. The index of the unbalance degree of the voltage reaches the national standard GB/T15543-2008. The limit value of the three-phase voltage unbalance of the electric energy quality is required.
Still further preferably, the currents of the respective phases of the m sets of power-type energy storage compensation devices and the currents of the respective phases of the n-m sets of energy-type energy storage compensation devices are equal.
Specifically, the secondary side currents of the three-phase matching transformer MT are respectively i M1 、i M2 And i M3 When the first group of energy storage compensation devices EC 1 The second group of energy storage compensation devices EC 2 … … and the nth group of energy storage compensation devices EC n When the traction load is in a charge-discharge function, two-phase current i of the secondary side of the corresponding three-phase matching transformer MT where the traction load is positioned is controlled M1 、i M2 Energy exchange is performed and another phase current i M3 Is 0;
when the first group of energy storage compensation devices EC 1 The second group of energy storage compensation devices EC 2 … … and the nth group of energy storage compensation devices EC n When compensating for the electric energy quality, controlling the three-phase current i of the secondary side of the three-phase matching transformer M1 、i M2 And i M3 Make compensation and current i M1 、i M2 And i M3 The sum is 0;
when the first group of energy storage compensation devices EC 1 The second group of energy storage compensation devices EC 2 … … and the nth group of energy storage compensation devices EC n When the charging and discharging functions are provided and the electric energy quality compensation is provided, the control i is controlled M1 、i M2 And i M3 Is the superposition of the charge-discharge control current and the in-phase compensation current.
Compared with the prior art, the invention has the beneficial effects that:
1. the invention adopts a three-phase-to-direct current converter AD 1 Multiplexing the in-phase power supply and energy storage functions, and saving the capacity of the converter and the system investment;
2. the invention adopts the design of the small-capacity unit module, improves the reliability and expansibility of the system and is convenient to maintain;
3. the power type energy storage device is high in cycle charge and discharge times, is used for recovering regenerative braking energy, is high in energy and is used for load peak clipping. The power type and energy type energy storage devices are adopted for classification arrangement, so that the energy storage devices can be fully utilized, the utilization rate of each functional component is improved, and the service life of each functional component is prolonged;
4. the control method is simple, implements the in-phase and energy storage functions, achieves the peak elimination of traction load, reduces the equipment capacity requirement of a power supply system, reduces the equipment capacity and the running cost, effectively utilizes the regenerative braking energy of the train, and further optimizes the economic and energy-saving running of the traction substation of the electrified railway.
Drawings
Fig. 1 is a schematic structural diagram of an in-phase energy storage and supply device of an electrified railway according to a first embodiment of the present invention.
Fig. 2 is a schematic structural diagram of an in-phase energy storage and supply device of an electrified railway according to a second embodiment of the present invention.
Fig. 3 is a flowchart of a control method for in-phase energy storage and power supply of the electrified railway according to the third embodiment of the invention.
Fig. 4 is a specific flowchart of charge and discharge control in the third embodiment of the present invention.
Fig. 5 is a graph of the power demand of fig. 4.
Fig. 6 is a flowchart of power quality compensation control according to the third embodiment of the present invention.
Description of the embodiments
The working principle of the invention is as follows: three-phase intersecting-direct current converter AD 1 Having current source characteristics, using a three-phase dc-dc converter AD 1 And the superposition of the charge and discharge control current and the electric energy compensation current realizes the in-phase energy storage power supply of the electrified railway. Dividing a regenerative braking energy utilization interval and a peak elimination interval according to the traction load historical data and the characteristics of the energy storage device according to time periods, wherein the power type energy storage compensation device preferentially works in the regenerative braking energy utilization interval to perform regenerative braking energy utilization, and energy sources are saved; the energy type energy storage compensation device works in a peak clipping interval preferentially to clip peaks, so that traction power supply cost is reduced. The invention is further described below with reference to the drawings and detailed description.
Example 1
As shown in fig. 1, the embodiment of the invention provides an in-phase energy storage power supply device of an electrified railway, wherein the in-phase energy storage power supply device comprises a three-phase traction transformer TT for transmitting line voltage of a three-phase power system to a traction bus, a three-phase matching transformer MT for matching and electrically isolating voltage of an energy storage compensation device, a plurality of energy storage compensation devices for real-time charge and discharge and/or power quality compensation, and a coordination control device CC for detecting operation conditions of traction load and magnitude of traction load and coordinating real-time charge and discharge control or/and power quality control of the energy storage compensation devices.
The primary side of the three-phase traction transformer TT is connected with a three-phase power system, and the secondary side terminals a and b are connected with a traction load TL; the primary side of the three-phase matching transformer MT is connected with the secondary side of the three-phase traction transformer TT; the plurality of energy storage compensation devices are a first group of energy storage compensation devices EC 1 Second group of energy storage compensation devices EC 2 … … and nth group of energy storage compensation devices EC n And n is a positive integer, the first group of energy storage compensation devices EC 1 Second group of energy storage compensation devices EC 2 … … and nth group of energy storage compensation devices EC n The alternating current ends of the three-phase matching transformer MT are respectively connected with the secondary sides of the three-phase matching transformer MT; the input ends of the coordination control device CC are respectively connected with the secondary side In of the load feeder current transformer 1 And load bus voltage transformer secondary side In 2 The bidirectional signal ports of the first group of energy storage compensation devices EC are respectively connected with the first group of energy storage compensation devices 1 Second group of energy storage compensation devices EC 2 … … and nth group of energy storage compensation devices EC n Is connected to the bidirectional signal port of the circuit. In addition, the power supply device is applicable when the traction load is connected to the secondary terminals a, c or b, c of the three-phase traction transformer TT.
The first group of energy storage compensation devices EC 1 Comprising a first three-phase intersecting-direct current converter AD which is connected in series in turn 1 First switching power supply DD 1 And a first energy storage unit ES 1 The second group of energy storage compensation devices EC 2 Comprising a second three-phase intersecting-direct current converter AD which is connected in series in turn 2 Second switching power supply DD 2 And a second energy storage unit ES 2 And so on, the nth group of energy storage compensation devices EC n Comprises an nth third intersecting-direct current converter AD which is serially connected in sequence n N-th switching power supply DD n And an nth energy storage unit ES n . In an embodiment of the present invention, the first switching power supply DD 1 Second switching power supply DD 2 … … and nth switching power supply DD n Are all DC/DC converters. In addition, the first energy storage unit ES 1 Second energy storage unit ES 2 … … and nth energy storage unit ES n Can be any one of a battery, a super capacitor or a flywheel.
Therefore, the embodiment of the invention adopts the three-phase-to-direct current converter to multiplex the in-phase power supply and energy storage functions, thereby saving the capacity of the converter and the system investment. In addition, the embodiment of the invention adopts the design of the small-capacity unit module, improves the reliability and expansibility of the system and is convenient to maintain.
The energy storage compensation devices are divided into m groups of power type energy storage compensation devices and n-m groups of energy type energy storage compensation devices, and m is<n; wherein the first energy storage unit ES in the m groups of power type energy storage compensation devices 1 The second energy storage unit ES 2 … … and the mth energy storage unit ES m The power type energy storage compensation device is of m groups of power type; the (m+1) th energy storage unit ES m+1 The (m+2) th energy storage unit ES m+2 … … and the nth energy storage unit ES n The energy storage compensation device is of an energy type and forms n-m groups of energy type. Therefore, the invention adopts the power type energy storage unit to circularly charge and discharge for a plurality of times and is used for recovering the regenerative braking energy; the energy type energy storage unit has high energy and is used for load peak clipping. Meanwhile, the power type and energy type energy storage devices are adopted for classification arrangement, so that the energy storage devices can be fully utilized, and the utilization rate and the service life of each functional component are improved.
Example two
As shown in fig. 2, the embodiment of the invention provides an in-phase energy storage power supply device of an electrified railway, wherein the in-phase energy storage power supply device comprises a three-phase traction transformer TT and a standby three-phase traction transformer TB for transmitting line voltage of an electric power system to a traction bus, a three-phase matching transformer MT for matching and electrically isolating voltage of an energy storage compensation device, an energy storage compensation device for real-time charging and discharging and/or power quality compensation, and a coordination control device CC for detecting operation conditions of traction load and magnitude of traction load and coordinating real-time charging and discharging control or/and power quality control of the energy storage compensation device.
The primary sides of the three-phase traction transformer TT and the standby three-phase traction transformer TB are respectively connected with a three-phase power system, and the two terminals a and b on the secondary sides are respectively connected with a traction load TL; the primary side of the three-phase matching transformer MT is respectively connected with the secondary side of the three-phase traction transformer TT and the secondary side of the standby three-phase traction transformer TB; the plurality of energy storage compensation devices are a first group of energy storage compensation devices EC 1 Second group of energy storage compensation devices EC 2 … … and nth group of energy storage compensation devices EC n And n is a positive integer, the first group of energy storage compensation devices EC 1 Second group of energy storage compensation devices EC 2 … … and nth group of energy storage compensation devices EC n The alternating current ends of the three-phase matching transformer MT are respectively connected with the secondary sides of the three-phase matching transformer MT; the input ends of the coordination control device CC are respectively connected with the secondary side In of the load feeder current transformer 1 And load bus voltage transformer secondary side In 2 The bidirectional signal port of the first energy storage compensation device EC is respectively connected with the first energy storage compensation device EC 1 Second energy storage compensation device EC 2 … … and nth energy storage compensation device EC n Is connected to the bidirectional signal port of the circuit. In addition, the power supply device is applicable when the traction load is connected to the secondary terminals a, c or b, c of the three-phase traction transformer TT.
The first group of energy storage compensation devices EC 1 Comprising a first three-phase intersecting-direct current converter AD which is connected in series in turn 1 First switching power supply DD 1 And a first energy storage unit ES 1 The second group of energy storage compensation devices EC 2 Comprising a second three-phase intersecting-direct current converter AD which is connected in series in turn 2 Second switching power supply DD 2 And a second energy storage unit ES 2 And so on, the nth group of energy storage compensation devices EC n Comprises an nth third intersecting-direct current converter AD which is serially connected in sequence n Nth (n)Switch power supply DD n And an nth energy storage unit ES n . In an embodiment of the present invention, the first switching power supply DD 1 Second switching power supply DD 2 … … and nth switching power supply DD n Are all DC/DC converters. In addition, the first energy storage unit ES 1 Second energy storage unit ES 2 … … and nth energy storage unit ES n Can be any one of a battery, a super capacitor or a flywheel.
Therefore, the embodiment of the invention adopts the three-phase-to-direct current converter to multiplex the in-phase power supply and energy storage functions, thereby saving the capacity of the converter and the system investment. In addition, the embodiment of the invention adopts the design of the small-capacity unit module, improves the reliability and expansibility of the system and is convenient to maintain.
The energy storage compensation devices are divided into m groups of power type energy storage compensation devices and n-m groups of energy type energy storage compensation devices, and m is<n; wherein the first energy storage unit ES in the m groups of power type energy storage compensation devices 1 The second energy storage unit ES 2 … … and the mth energy storage unit ES m The power type energy storage compensation device is of m groups of power type; the (m+1) th energy storage unit ES m+1 The (m+2) th energy storage unit ES m+2 … … and the nth energy storage unit ES n The energy storage compensation device is of an energy type and forms n-m groups of energy type. Therefore, the invention adopts the power type energy storage unit to circularly charge and discharge for a plurality of times and is used for recovering the regenerative braking energy; the energy type energy storage unit has high energy and is used for load peak clipping. Meanwhile, the power type and energy type energy storage devices are adopted for classification arrangement, so that the energy storage devices can be fully utilized, and the utilization rate and the service life of each functional component are improved.
Example III
As shown in fig. 3, the embodiment of the invention provides a control method of an in-phase energy storage and power supply device of an electrified railway, wherein the control method comprises the following specific steps:
step one, adopting a load feeder current transformer secondary side In 1 And load bus voltage transformer secondary side In 2 Detecting the traction load operation condition and the traction load size;
step two, coordinating the first group of energy storage compensation devices EC 1 The second group of energy storage compensation devices EC 2 … … and the nth group of energy storage compensation devices EC n And carrying out charge and discharge control or/and electric energy quality control in real time.
As shown in fig. 4, in the embodiment of the present invention, the specific method for controlling the charge and discharge in the second step includes the following steps:
counting historical daily traction load data by adopting a coordination control device CC, calculating a power average value of the traction load in the whole time period according to a fixed period and a slip to obtain a historical daily power demand curve, selecting a maximum demand contract value in the time period, and judging and dividing a regeneration braking energy utilization control interval and a peak elimination control interval according to the maximum demand contract value, the power demand curve and the whole time period;
when the power demand value of the traction load is smaller than the maximum demand contract value, namely, a section of the power demand curve below the maximum demand contract value is taken as a regeneration braking energy utilization control section, and the section is mainly used for preferentially controlling m groups of power type energy storage compensation devices; when the traction load is detected to run under the traction working condition, the first group of energy storage compensation devices EC are controlled 1 The second group of energy storage compensation devices EC 2 … … and the m-th group energy storage compensation device EC m Discharging; when the traction load is detected to run under the regenerative braking working condition, the first group of energy storage compensation devices EC are controlled 1 The second group of energy storage compensation devices EC 2 … … and the m-th group energy storage compensation device EC m Charging;
when the power demand value of the traction load is greater than the maximum demand contract value, namely, the section of the power demand curve above the maximum demand contract value is taken as the peak elimination control section, the section mainly controls the n-m groups of energy storage compensation devices to work as priority, and controls the m+1st group of energy storage compensation devices EC m+1 The m+2 group energy storage compensation device EC m+2 … … and the nth group of energy storage compensation devices EC n Discharging according to the peak clipping reference value to realize peak clipping of traction load. In an embodiment of the present invention, the peak clipping referenceThe value is a charge-discharge threshold value of the energy storage device ED, and can enable the peak in the original power demand curve to be reduced to a maximum demand contract value.
As shown in fig. 5, in order to better understand the specific method of charge and discharge control according to the embodiment of the present invention. The following examples are specifically listed: counting the measured historical voltage and current data of a traction substation, and calculating the traction load power to obtain a power demand curve in the graph, wherein the traction state is when the power is more than 0, and the regenerative braking state is when the power is less than 0; and calculating an average value of the power data by taking 15 minutes as a period, carrying out slip according to 1 minute, and calculating the average value of the power in the whole time range to obtain a power demand curve of the graph, wherein the maximum value in the power demand curve is the maximum power demand of the time section. Assuming that the peak-cut power maximum demand expected value is 32MW, which is the maximum demand contract value, as shown by the dotted line position in fig. 5, there are 4 intersections of the maximum demand contract value with the power demand curve, and the power demand curve is divided into five parts (1), (2), (3), (4) and (5). Wherein, the power demand values of (1), (3) and (5) are all smaller than 32MW, and the energy storage compensation device is not needed to carry out peak clipping, and the energy storage compensation device is divided into a regenerative braking energy utilization control section which mainly utilizes the regenerative braking energy; (2) and (4) the power demand value is larger than 32MW, the peak clipping is needed through an energy storage compensation device, the power demand is reduced, and the power demand is divided into a peak clipping control section, and the peak clipping is mainly carried out through continuous discharge control. (2) Or (4) and 32MW, the area surrounded by the dotted line is the energy required to be continuously discharged by the energy storage compensation device.
As shown in fig. 6, in the embodiment of the present invention, the specific method for controlling the power quality compensation in the second step is as follows: on the premise of charge and discharge control, calculating the index of the voltage unbalance degree (electric energy quality) of the traction load; when the index of the voltage unbalance (electric energy quality) reaches the preset limit value, the first group of energy storage compensation devices EC is controlled 1 The second group of energy storage compensation devices EC 2 … … and the nth group of energy storage compensation devices EC n Is 0; when the voltage unbalance (electric energy quality) does not reach the preset limit value, the first group of energy storage is controlledCompensation device EC 1 The second group of energy storage compensation devices EC 2 … … and the nth group of energy storage compensation devices EC n And respectively generating in-phase compensation current and superposing the in-phase compensation current on the charge-discharge control current, so that the electric energy quality index of the voltage unbalance degree reaches the national standard limit value requirement. Besides voltage unbalance, and power quality indexes of interest of the electrified railway, harmonic waves and reactive power are also included. The preset limit value is a threshold value set according to the requirement of the national standard of the electric energy quality on the voltage unbalance degree. Such as: according to the national standard GB/T15543-2008 three-phase voltage unbalance of electric energy quality, the following is specified: when the power grid is in normal operation, the unbalance degree of the negative sequence voltage is not more than 2%, and the unbalance degree of the negative sequence voltage is not more than 4% in short time. Regarding harmonic and reactive limits, the harmonic and reactive content of current ac-dc-ac locomotives is negligible due to their low content.
In the embodiment of the invention, the currents of the corresponding phases of the m groups of power type energy storage compensation devices are equal to the currents of the corresponding phases of the n-m groups of energy type energy storage compensation devices. The corresponding phases are ABC three phases of each energy storage compensation device, and in actual application, the currents of the A phase, the B phase and the C phase of each energy storage compensation device are required to be respectively equal to the currents of the A phase, the B phase and the C phase of the three-phase power system.
In the embodiment of the invention, the secondary side currents of the three-phase matching transformer MT are respectively i M1 、i M2 And i M3 When the first group of energy storage compensation devices EC 1 The second group of energy storage compensation devices EC 2 … … and the nth group of energy storage compensation devices EC n When the traction load is in a charge-discharge function, two-phase current i of the secondary side of the corresponding three-phase matching transformer MT where the traction load TL is positioned is controlled M1 、i M2 Energy exchange is performed and another phase current i M3 Is 0;
when the first group of energy storage compensation devices EC 1 The second group of energy storage compensation devices EC 2 … … and the nth group of energy storage compensation devices EC n For compensating the electric energy quality, controlling the three-phase current i of the secondary side of the three-phase matching transformer MT M1 、i M2 And i M3 Make compensation and current i M1 、i M2 And i M3 The sum is 0;
when the first group of energy storage compensation devices EC 1 The second group of energy storage compensation devices EC 2 … … and the nth group of energy storage compensation devices EC n When the charging and discharging functions are provided and the electric energy quality compensation is provided, the control i is controlled M1 、i M2 And i M3 Is the superposition of the charge-discharge control current and the in-phase compensation current.
Therefore, according to the traction load historical data and the characteristics of the energy storage compensation device, the regenerative braking energy utilization interval and the peak elimination interval are divided according to time periods, and the power type energy storage compensation device preferentially works in the regenerative braking energy utilization interval to perform regenerative braking energy utilization, so that energy sources are saved; the energy type energy storage compensation device works in a peak clipping interval preferentially to clip peaks, so that traction power supply cost is reduced. Meanwhile, the embodiment of the invention is beneficial to optimizing the economic energy-saving operation of the traction substation of the electrified railway, thereby achieving the purposes of eliminating peak of traction load and reducing the operation cost of a system, and effectively utilizing the regenerative braking energy of the train.
Claims (9)
1. An in-phase energy storage and power supply device for an electrified railway, which is characterized by comprising:
the three-phase traction transformer TT is used for transmitting line voltage of a three-phase power system to a traction bus, the primary side of the three-phase traction transformer TT is connected with the three-phase power system, and any two terminals on the secondary side of the three-phase traction transformer TT are connected with a traction load TL;
the three-phase matching transformer MT is used for voltage matching and electric isolation of the energy storage compensation device, and the primary side of the three-phase matching transformer MT is connected with the secondary side of the three-phase traction transformer TT;
the energy storage compensation device is used for real-time charge and discharge and/or power quality compensation, and is a first group of energy storage compensation devices EC 1 Second group of energy storage compensation devices EC 2 … … and nth group of energy storage compensation devices EC n And n is a positive integer, the first group of energy storage compensation devices EC 1 Second group of energy storage compensation devices EC 2 Energy storage compensation device of group n and … …EC n The alternating current ends of the three-phase matching transformer MT are respectively connected with the secondary sides of the three-phase matching transformer MT;
the coordination control device CC is used for detecting the operation condition and the size of the traction load and coordinating the real-time charge and discharge control or/and the electric energy quality control of the energy storage compensation device, and the input end of the coordination control device CC is respectively connected with the secondary side In of the load feeder current transformer 1 And load bus voltage transformer secondary side In 2 The bidirectional signal ports of the first group of energy storage compensation devices EC are respectively connected with the first group of energy storage compensation devices 1 Second group of energy storage compensation devices EC 2 … … and nth group of energy storage compensation devices EC n Is connected to the bidirectional signal port of the circuit.
2. The in-phase energy storage and supply device for an electrified railway according to claim 1, wherein said first group of energy storage compensation devices EC 1 Comprising a first three-phase intersecting-direct current converter AD which is connected in series in turn 1 First switching power supply DD 1 And a first energy storage unit ES 1 The second group of energy storage compensation devices EC 2 Comprising a second three-phase intersecting-direct current converter AD which is connected in series in turn 2 Second switching power supply DD 2 And a second energy storage unit ES 2 The nth group of energy storage compensation devices EC n Comprises an nth third intersecting-direct current converter AD which is serially connected in sequence n N-th switching power supply DD n And an nth energy storage unit ES n 。
3. An in-phase energy storage and supply device for an electrified railway according to claim 2 and wherein the energy storage compensation devices are divided into m groups of power type energy storage compensation devices and n-m groups of energy type energy storage compensation devices, and m is<n; wherein the first energy storage unit ES in the m groups of power type energy storage compensation devices 1 The second energy storage unit ES 2 … … and mth energy storage unit ES m The power type energy storage compensation device is of m groups of power type; m+1th energy storage unit ES m+1 M+2th energy storage unit ES m+2 … … and nth energy storage unit ES n The energy storage compensation device is of an energy type and forms n-m groups of energy type.
4. The in-phase energy storage and power supply device for an electrified railway according to claim 1, further comprising a backup three-phase traction transformer TB serving as a backup transformer for the three-phase traction transformer TT, wherein a primary side of the backup three-phase traction transformer TB is connected to a three-phase power system, and any two terminals of a secondary side of the backup three-phase traction transformer TB are connected to traction loads; the secondary side of the standby three-phase traction transformer TB is also connected with the primary side of the three-phase matching transformer MT.
5. A control method of an in-phase energy storage and supply device of an electrified railway according to any one of the preceding claims 1 to 4, characterized by: the control method comprises the following specific steps:
step one, adopting a load feeder current transformer secondary side In 1 And load bus voltage transformer secondary side In 2 Detecting the traction load operation condition and the traction load size;
step two, coordinating the first group of energy storage compensation devices EC 1 The second group of energy storage compensation devices EC 2 … … and the nth group of energy storage compensation devices EC n And carrying out charge and discharge control or electric energy quality control in real time.
6. The method for controlling the in-phase energy storage and power supply device of the electrified railway according to claim 5, wherein the specific method for controlling the charge and discharge in the second step comprises the following steps:
counting historical daily traction load data by adopting a coordination control device CC, calculating a power average value of the traction load in the whole time period according to a fixed period and a slip to obtain a historical daily power demand curve, selecting a maximum demand contract value in the time period, and judging and dividing a regeneration braking energy utilization control interval and a peak elimination control interval according to the maximum demand contract value, the power demand curve and the whole time period;
when the power demand of the traction load is less than the maximum demand contract value, i.e. the power demand curve is below the maximum demand contract valueThe section is a regenerative braking energy utilization control section, and the section mainly controls m groups of power type energy storage compensation devices; when the traction load is detected to run under the traction working condition, the first group of energy storage compensation devices EC are controlled 1 The second group of energy storage compensation devices EC 2 … … and m-th group energy storage compensation device EC m Discharging; when the traction load is detected to run under the regenerative braking working condition, the first group of energy storage compensation devices EC are controlled 1 The second group of energy storage compensation devices EC 2 … … and m-th group energy storage compensation device EC m Charging;
when the power demand value of the traction load is greater than the maximum demand contract value, namely, the section of the power demand curve above the maximum demand contract value is taken as the peak elimination control section, the section mainly controls the n-m groups of energy storage compensation devices to work as priority, and controls the m+1st group of energy storage compensation devices EC m+1 M+2 group energy storage compensation device EC m+2 … … and nth group of energy storage compensation devices EC n Discharging according to the peak clipping reference value to realize peak clipping of traction load.
7. The method for controlling an in-phase energy storage and supply device for an electrified railway according to claim 5, wherein the specific method for controlling the power quality compensation in the second step comprises the following steps:
under the premise of charge and discharge control, calculating a voltage unbalance index of the traction load; when the voltage unbalance index reaches the preset limit value, the first group of energy storage compensation devices EC are controlled 1 The second group of energy storage compensation devices EC 2 … … and the nth group of energy storage compensation devices EC n Is 0; when the voltage unbalance index does not reach the preset limit value, the first group of energy storage compensation devices EC are controlled 1 The second group of energy storage compensation devices EC 2 … … and the nth group of energy storage compensation devices EC n And respectively generating in-phase compensation currents and overlapping the in-phase compensation currents with the charge and discharge control currents.
8. The method of controlling an in-phase energy storage and supply device for an electrified railway according to any one of claims 6 to 7, wherein the currents of the respective phases of the m sets of power type energy storage compensation devices and the currents of the respective phases of the n-m sets of energy type energy storage compensation devices are equal.
9. A control method of an in-phase energy storage and supply device for an electrified railway according to any one of claims 6 to 7 and wherein the secondary side currents of the three-phase matching transformer MT are respectively i M1 、i M2 And i M3 When the first group of energy storage compensation devices EC 1 The second group of energy storage compensation devices EC 2 … … and the nth group of energy storage compensation devices EC n When the traction load is in a charge-discharge function, two-phase current i of the secondary side of the corresponding three-phase matching transformer MT where the traction load is positioned is controlled M1 、i M2 Energy exchange is performed and another phase current i M3 Is 0;
when the first group of energy storage compensation devices EC 1 The second group of energy storage compensation devices EC 2 … … and the nth group of energy storage compensation devices EC n For compensating the electric energy quality, controlling the three-phase current i of the secondary side of the three-phase matching transformer MT M1 、i M2 And i M3 Make compensation and current i M1 、i M2 And i M3 The sum is 0;
when the first group of energy storage compensation devices EC 1 The second group of energy storage compensation devices EC 2 … … and the nth group of energy storage compensation devices EC n When the charging and discharging functions are provided and the electric energy quality compensation is provided, the control i is controlled M1 、i M2 And i M3 Is the superposition of the charge-discharge control current and the in-phase compensation current.
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| CN110601242A (en) * | 2019-10-21 | 2019-12-20 | 西南交通大学 | Power supply and energy storage structure of traction substation and control method thereof |
| CN110729731B (en) * | 2019-11-22 | 2024-04-12 | 西南交通大学 | Through type in-phase power supply structure of electrified railway and control method thereof |
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