CN110619791A - High-speed rail comprehensive energy utilization system experiment platform and experiment method thereof - Google Patents
High-speed rail comprehensive energy utilization system experiment platform and experiment method thereof Download PDFInfo
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Abstract
An experiment platform of a high-speed rail comprehensive energy utilization system and an experiment method thereof are provided, wherein the experiment platform comprises an equivalent traction power supply system, a left equivalent locomotive, a right equivalent locomotive, a back-to-back converter device, an energy storage device, a new energy power generation device, an inversion feedback device and a control system, and the experiment method comprises the steps of preparing the experiment platform, simulating a traction working condition and a regenerative braking working condition of the equivalent locomotive to enable the equivalent traction power supply system to be in a power consumption working condition or a power feedback working condition, controlling a load transfer process of the back-to-back converter device, a discharge or charging process of the energy storage device, a discharge process of the new energy power generation device or a discharge process of the inversion feedback device when the equivalent traction. The system can simulate the energy storage, inversion feedback utilization and new energy consumption of regenerative braking energy of a high-speed rail traction power supply system, can be used for verifying energy management strategies and control methods of an energy storage device, an inversion feedback device and a new energy power generation device, is low in cost and is convenient to improve and optimize.
Description
Technical Field
The invention relates to the technical field of high-speed rails, in particular to an experimental platform and an experimental method for a high-speed rail comprehensive energy utilization system.
Background
The motor train unit of the high-speed railway preferentially adopts a regenerative braking mode in the braking process, and a large amount of regenerative braking energy is generated. According to statistics, the regenerative braking energy which can be generated by the motor train unit from Beijing south to Tianjin every day is about 33.291MWh, and the regenerative braking energy which can be generated every year is up to 120 GWH. Only a small part of the regenerative braking energy is consumed by other traction motor train units and braking resistors, and the rest most of the regenerative braking energy is returned to the power grid through the traction transformer. Because the electric network implements the charging principle of return and non-counting, the return of the regenerative braking energy to the electric network is free.
The high-speed rail in China is wide in distribution, part of local power grids along the railway are weak, but renewable energy sources (such as solar energy, wind energy and the like) are abundant, the operation load of the local power grids for supporting the high-speed rail is large, the renewable energy sources cannot be completely consumed, the phenomena of wind and light abandoning are serious, and energy waste is caused. How to introduce renewable energy sources into railways for consumption and reduce the power supply burden of local power grids is also a problem faced at present.
The technical scheme aiming at the utilization of the regenerative braking energy and the consumption of new energy of the high-speed rail traction power supply system is not applied to engineering, so that the reliability, the safety and the effectiveness of the technical scheme are urgently needed to be verified. Therefore, the real, credible and high-applicability comprehensive energy utilization system experiment platform for the high-speed rail traction power supply system is established, the reliability, safety and effectiveness of the high-speed rail traction power supply system regenerative braking energy utilization and new energy consumption scheme can be verified, and the experimental platform can be used as a teaching experiment platform for related colleges and universities and scientific research units and has very important significance.
Disclosure of Invention
The invention aims to provide an experimental platform and an experimental method for a high-speed rail comprehensive energy utilization system.
The technical scheme for realizing the purpose of the invention is as follows:
an experimental platform of a high-speed rail comprehensive energy utilization system comprises an equivalent traction power supply system, a left equivalent locomotive, a right equivalent locomotive, a back-to-back converter device, an energy storage device, a new energy power generation device, an inversion feedback device and a control system;
the equivalent traction power supply system comprises traction transformers T1 and T2 and autotransformers AT1, AT2, AT3 and AT 4; two ends of a primary side of the T1 are respectively connected to an A phase and a B phase of a three-phase power grid, two ends of a secondary side of the T1 are respectively connected to a contact line and a positive feeder of a left power supply arm, and a middle end of the secondary side of the T1 is connected to a steel rail; two ends of a primary side of the T2 are respectively connected to a phase C and a phase B of a three-phase power grid, two ends of a secondary side of the T2 are respectively connected to a contact line and a positive feeder of a right power supply arm, and a middle end of the secondary side of the T2 is connected to a steel rail; two ends of AT1 and AT2 are respectively connected to a contact line and a positive feeder of the left power supply arm, and the middle end is connected to a steel rail; two ends of AT3 and AT4 are respectively connected to a contact line and a positive feeder of the right power supply arm, and the middle end is connected to a steel rail;
the left equivalent locomotive comprises an isolation transformer T5, a pre-charging module P3, a four-quadrant converter C7, an adjustable load L2 and a direct-current power supply D2; the input end of the T5 is connected to the left power supply arm, the output end is connected to the AC side of the C7 through the P3, and the DC side of the C7 is connected to the L2 and the D2 through the DC breakers K9 and K10 respectively; the P3 comprises an alternating current breaker K7 and a pre-charging resistor R3 which are connected in series, and an alternating current contactor KM3 is also connected in parallel with the R3;
the right equivalent locomotive comprises an isolation transformer T6, a pre-charging module P4, a four-quadrant converter C8, an adjustable load L3 and a direct-current power supply D3; the input end of the T6 is connected to the right power supply arm, the output end is connected to the AC side of the C8 through the P4, and the DC side of the C8 is connected to the L3 and the D3 through the DC breakers K11 and K12 respectively; the P4 comprises an alternating current breaker K8 and a pre-charging resistor R4 which are connected in series, and an alternating current contactor KM4 is also connected in parallel with the R4;
the back-to-back converter device comprises isolation transformers T3 and T4, pre-charging modules P1 and P2, and four-quadrant converters C1 and C2; the input end of the T3 is connected to the left power supply arm, and the output end is connected to the alternating current side of the C1 through the P1; the input end of the T4 is connected to the right power supply arm, and the output end is connected to the alternating current side of the C2 through the P2; the P1 comprises an alternating current breaker K1 and a pre-charging resistor R1 which are connected in series, and an alternating current contactor KM1 is also connected in parallel with the R1; the P2 comprises an alternating current breaker K2 and a pre-charging resistor R2 which are connected in series, and an alternating current contactor KM2 is also connected in parallel with the R2;
the energy storage device comprises a bidirectional DC/DC converter C3 and an energy storage medium S1; one end of the C3 is connected to the DC sides of the C1 and the C2 through an AC breaker K3, and the other end is connected to S1; the energy-saving device also comprises a bidirectional DC/DC converter C4 and an energy storage medium S2; one end of the C4 is connected to the DC sides of the C1 and C2 through a DC breaker K4, and the other end is connected to S2;
the new energy power generation device comprises a unidirectional DC/DC converter C5 and a new energy unit D1; one end of the C5 is connected to the DC sides of the C1 and C2 through a DC breaker K5, and the other end is connected to D1;
the inversion feedback device comprises a bidirectional DC/AC converter C6 and an adjustable load L1; one end of the C6 is connected to the DC sides of the C1 and C2 through a DC breaker K6, and the other end is connected to L1;
the control system is respectively connected to the left equivalent locomotive, the right equivalent locomotive, the back-to-back converter, the energy storage device, the new energy power generation device and the inversion feedback device.
Further, the energy storage medium S1 is any one of a super capacitor, a storage battery and a lithium battery, and the energy storage medium S2 is any one of a super capacitor, a storage battery and a lithium battery.
Further, the new energy unit D1 is a photovoltaic or fuel cell.
Further, the system also comprises a monitoring system; the monitoring system is respectively connected to the control system, the left equivalent locomotive, the right equivalent locomotive, the back-to-back converter, the energy storage device, the new energy power generation device and the inversion feedback device.
Further, the system also comprises a protection system; the protection system is respectively connected to the control system, the left equivalent locomotive, the right equivalent locomotive, the back-to-back converter device, the energy storage device, the new energy power generation device and the inversion feedback device.
The experimental method of the experimental platform of the high-speed rail comprehensive energy utilization system comprises the following steps
Step 1: preparation of experimental platform, specifically
Closing alternating current breakers K1, K2, K7 and K8, and pre-charging direct current side capacitors of the four-quadrant converters C1, C2, C7 and C8;
when the direct-current side voltage reaches a set threshold value, closing alternating-current contactors KM1, KM2, KM3 and KM4 to enable the direct-current side voltages of the four-quadrant converters C1, C2, C7 and C8 to rise to the rated voltage of uncontrolled rectification; the control system sends out control pulse signals to control the four-quadrant converters C1, C2, C7 and C8 to be in a no-load running state;
closing the direct current circuit breakers K3, K4, K5 and K6, and keeping the energy storage device, the new energy power generation device and the inversion feedback device in a standby state at the moment;
step 2: making the equivalent traction power supply system in a power consumption working condition or a power return working condition, wherein
The method for enabling the equivalent traction power supply system to be in the power consumption working condition comprises the following steps:
closing the direct current circuit breakers K9 and K11, controlling the four-quadrant converters C7 and C8 to be in a rectification state by a control system through controlling control pulse signals of the four-quadrant converters C7 and C8, and simulating the traction working condition of the locomotive to enable the equivalent traction power supply system to be in a power consumption working condition;
or, the direct current circuit breakers K9 and K12 are closed, the control system controls the four-quadrant converter C7 to be in a rectification state and the four-quadrant converter C8 to be in an inversion state by controlling control pulse signals of the four-quadrant converter C7 and C8, the rectification power is greater than the inversion power, the control system is used for simulating the working condition that the equivalent traction power supply system simultaneously generates a traction locomotive and a regenerative braking locomotive, and the traction power is greater than the regenerative power so that the equivalent traction power supply system is in a power consumption working condition;
or, the direct current circuit breakers K10 and K11 are closed, the control system controls the four-quadrant converter C7 to be in an inversion state and the four-quadrant converter C8 to be in a rectification state by controlling control pulse signals of the four-quadrant converter C7 and C8, the rectification power is greater than the inversion power, the control system is used for simulating the working condition that the equivalent traction power supply system simultaneously generates a traction locomotive and a regenerative braking locomotive, and the traction power is greater than the regenerative power so that the equivalent traction power supply system is in a power consumption working condition;
the method for enabling the equivalent traction power supply system to be in the working condition of the return power comprises the following steps:
closing the direct current circuit breakers K10 and K12, controlling the four-quadrant converters C7 and C8 to be in an inversion state by a control system through controlling control pulse signals of the four-quadrant converters C7 and C8, and simulating a regenerative braking working condition of the locomotive to enable the equivalent traction power supply system to be in a return power working condition;
or, the direct current circuit breakers K9 and K12 are closed, the control system controls the four-quadrant converter C7 to be in a rectification state and the four-quadrant converter C8 to be in an inversion state by controlling control pulse signals of the four-quadrant converter C7 and C8, the rectification power is smaller than the inversion power, the control system is used for simulating the working condition that the equivalent traction power supply system simultaneously generates a traction locomotive and a regenerative braking locomotive, and the traction power is smaller than the regenerative power so that the equivalent traction power supply system is in a return power working condition;
or, the direct current circuit breakers K10 and K11 are closed, the control system controls the four-quadrant converter C7 to be in an inversion state and the four-quadrant converter C8 to be in a rectification state by controlling control pulse signals of the four-quadrant converter C7 and C8, the rectification power is smaller than the inversion power, the control system is used for simulating the working condition that the equivalent traction power supply system simultaneously generates a traction locomotive and a regenerative braking locomotive, and the traction power is smaller than the regenerative power so that the equivalent traction power supply system is in a return power working condition;
when the equivalent traction power supply system is in a power consumption working condition, executing the step 3 as follows:
the control system judges whether the residual energy of the energy storage media S1 and S2 meets the discharging condition; if so, calculating the discharge reference power of the energy storage device, otherwise, setting the discharge reference power of the energy storage device to be 0;
the control system judges whether the new energy power generation device meets a discharging condition; if so, calculating the discharge reference power of the new energy power generation device, otherwise, setting the discharge reference power of the new energy power generation device to be 0;
according to the discharging reference power of the energy storage device and the new energy power generation device, calculating active reference power of the four-quadrant converters C1 and C2, and calculating reference power of the bidirectional DC/DC converters C3 and C4 and the unidirectional DC/DC converter C5;
the control system controls active reference power of the four-quadrant converters C1 and C2 and controls reference power of the bidirectional DC/DC converters C3 and C4 and the unidirectional DC/DC converter C5 according to reference power of the energy storage device and the new energy power generation device; adjusting the control pulse signal, and transferring the energy released by the energy storage media S1 and S2 and the new energy power generation unit D1 to the left and right power supply arms through a back-to-back converter device for equivalent locomotive traction consumption;
when the equivalent traction power supply system is in the foldback power working condition, executing the step 3', as follows:
the control system judges whether the residual capacities of the energy storage media S1 and S2 meet the charging condition; if so, calculating the charging reference power of the energy storage device, otherwise, setting the charging reference power of the energy storage device to be 0;
the control system judges whether the inversion feedback device meets the inversion feedback condition; if so, calculating the discharge reference power of the inversion feedback device, otherwise, setting the discharge reference power of the inversion feedback device to be 0;
according to the charging reference power of the energy storage device and the discharging reference power of the inversion feedback device, controlling the reference power of the bidirectional DC/DC converters C3 and C4, the active reference power of the four-quadrant converters C1 and C2 and the active reference power of the DC/AC converter C6; regulating the control pulse signal to store the regenerative braking energy on the left and right power supply arms into the energy storage medium
S1, S2 and feedback to adjustable load L1.
The invention has the advantages that the energy storage, inversion feedback utilization and operation of the new energy consumption device of the regenerative braking energy of the high-speed rail traction power supply system can be simulated, and the technical support is provided for the engineering application of the regenerative braking energy utilization and new energy consumption device of the high-speed rail traction power supply.
Drawings
FIG. 1 is a schematic structural diagram of an experimental platform.
FIG. 2 is a flow chart of an experimental method of the experimental platform.
Detailed Description
The invention is explained in further detail below with reference to the drawing.
As shown in fig. 1, an experimental platform of a high-speed rail comprehensive energy utilization system comprises an equivalent traction power supply system, an equivalent locomotive, a back-to-back converter, an energy storage device, a new energy power generation device, an inversion feedback device, a control system, a monitoring system and a protection system. The equivalent traction power supply system consists of traction transformers T1 and T2, autotransformers AT1, AT2, AT3 and AT 4; primary sides of traction transformers T1 and T2 are electrically connected with a three-phase power grid, and secondary sides of the traction transformers T1 and T2 are electrically connected with autotransformers AT1, AT2, AT3 and AT 4; the autotransformers AT1 and AT2 are electrically connected with a left power supply arm of the equivalent traction power supply system; the autotransformers AT3 and AT4 are electrically connected with the right power supply arm of the equivalent traction power supply system. The equivalent locomotive consists of isolation transformers T5 and T6, pre-charging modules P3 and P4, four-quadrant converters C7 and C8, adjustable loads L2 and L3, and direct-current power supplies D2 and D3; primary sides of isolation transformers T5 and T6 are electrically connected with contact lines and steel rails of secondary sides of traction transformers T1 and T2 respectively, and the secondary sides are electrically connected with pre-charging modules P3 and P4 respectively; the pre-charging modules P3 and P4 respectively comprise an alternating current breaker K7, an alternating current contactor KM3, a pre-charging resistor R3, a breaker K8, an alternating current contactor KM4 and a pre-charging resistor R4; the pre-charging modules P3 and P4 are respectively and electrically connected with the alternating current sides of the four-quadrant current transformer C7 and C8; the direct current side of the four-quadrant converter C7 is respectively connected with an adjustable load L2 and a direct current power supply D2 through direct current breakers K9 and K10; the direct current side of the four-quadrant converter C8 is respectively connected with an adjustable load L3 and a direct current power supply D3 through direct current breakers K11 and K12. The back-to-back converter device consists of isolation transformers T3 and T4, pre-charging modules P1 and P2, and four-quadrant converters C1 and C2; primary sides of isolation transformers T3 and T4 are electrically connected with contact lines and steel rails of secondary sides of traction transformers T1 and T2 respectively, and the secondary sides are electrically connected with pre-charging modules P1 and P2 respectively; the pre-charging modules P1 and P2 respectively comprise an alternating current breaker K1, an alternating current contactor KM1, a pre-charging resistor R1, a breaker K2, an alternating current contactor KM2 and a pre-charging resistor R2; the pre-charging modules P1 and P2 are respectively and electrically connected with the alternating current sides of the four-quadrant current transformer C1 and C2; the direct current sides of the four-quadrant converter C1 and C2 are electrically connected to form a back-to-back structure. The energy storage device consists of direct current breakers K3 and K4, bidirectional DC/DC converters C3 and C4 and energy storage media S1 and S2; the direct current circuit breakers K3 and K4 are respectively electrically connected with the direct current sides of the back-to-back converter devices; the high-voltage sides of the bidirectional DC/DC converters C3 and C4 are electrically connected with the direct-current circuit breakers K3 and K4; the energy storage media S1 and S2 are respectively and electrically connected with the low-voltage sides of the bidirectional DC/DC converters C3 and C4; the energy storage media S1 and S2 can be energy storage elements such as super capacitors, storage batteries and lithium batteries. The new energy power generation device consists of a direct current breaker K5, a unidirectional DC/DC converter C5 and a new energy unit D1; the direct current breaker K5 is electrically connected with the direct current side of the back-to-back converter; the high-voltage side of the unidirectional DC/DC converter C5 is electrically connected with a direct-current breaker K3; the new energy unit D1 is electrically connected with the low-voltage side of the unidirectional DC/DC converter C5; the new energy unit D1 may be a photovoltaic, fuel cell, or other new energy unit. The inversion feedback device consists of an alternating current breaker K6, a DC/AC converter C6 and an adjustable load L1; the direct current breaker K6 is electrically connected with the direct current side of the back-to-back converter; the DC side of the DC/AC converter C6 is electrically connected with a DC breaker K6; the AC side of the DC/AC converter C6 is electrically connected with an adjustable load L1; the adjustable load L1 is used for simulating the load of a 10kV power distribution network of the traction power supply system. The control system is electrically connected with the back-to-back converter, the energy storage device, the new energy power generation device, the inversion feedback device and the equivalent locomotive respectively and is used for controlling the working states of the back-to-back converter, the energy storage device and the new energy power generation device of the equivalent locomotive. The control system may be implemented by a DSP or other microcontroller. The monitoring system is electrically connected with the back-to-back converter, the energy storage device, the new energy power generation device, the inversion feedback device and the equivalent locomotive respectively and is used for monitoring the working states of the back-to-back converter, the energy storage device, the new energy power generation device, the inversion feedback device and the equivalent locomotive. The protection system is electrically connected with the back-to-back converter, the energy storage device, the new energy power generation device, the inversion feedback device and the equivalent locomotive respectively and is used for protecting the operation safety of the back-to-back converter, the energy storage device, the new energy power generation device, the inversion feedback device and the equivalent locomotive.
As shown in fig. 2, the experimental method of the experimental platform of the high-speed rail integrated energy utilization system includes: starting the experiment platform; the equivalent locomotive simulates the locomotive traction working condition and the regenerative braking working condition, so that the equivalent traction power supply system is in the working condition of power consumption or power return; the method comprises the steps of a load transfer process of the back-to-back converter device when the equivalent traction power supply system is in a power consumption working condition, a discharge process of the energy storage device, a discharge process of the new energy power generation device, a load transfer process of the back-to-back converter device when the equivalent traction power supply system is in a power return working condition, a charging process of the energy storage device and a feedback process of the inversion feedback device.
The specific steps of starting the experiment platform comprise: s1.1, closing alternating current circuit breakers K1 and K2 of a back-to-back converter device, a direct current circuit breaker K7 of a left power supply arm equivalent locomotive, a direct current circuit breaker K8 of a right power supply arm equivalent locomotive, and pre-charging direct current side capacitors of four-quadrant converters C1, C2, C7 and C8; s1.2, when the voltage of the direct current side reaches a set threshold value, closing alternating current contactors KM1, KM2, KM3 and KM4, and increasing the voltage of the direct current side of the four-quadrant converters C1, C2, C7 and C8 to a rated voltage of uncontrolled rectification; the control system sends out control pulse signals to control the four-quadrant converters C1, C2, C7 and C8 to be in a no-load running state; s1.3, the alternating current circuit breakers K3, K4, K5 and K6 are closed, and at the moment, the energy storage device, the new energy power generation device and the inversion feedback device are in a standby state.
The equivalent locomotive simulates the locomotive traction working condition and the regenerative braking working condition, so that the equivalent traction power supply system is in the power consumption working condition or the power return working condition. The method comprises the following specific steps:
s2.1a closes a left power supply arm equivalent locomotive direct current breaker K9, a right power supply arm equivalent locomotive direct current breaker K11, and a control system controls four-quadrant converters C7 and C8 to be in a rectification state through control pulse signals for controlling the four-quadrant converters C7 and C8, so that the traction working condition of the locomotive is simulated, and at the moment, an equivalent traction power supply system is in a power consumption working condition.
S2.1b closes a left power supply arm equivalent locomotive direct current breaker K9, closes a right power supply arm equivalent locomotive direct current breaker K12, or closes a left power supply arm equivalent locomotive direct current breaker K10, closes a right power supply arm equivalent locomotive direct current breaker K11, controls a four-quadrant converter C7 and a control pulse signal of the C8 by a control system, controls the four-quadrant converter C7 and the C8 to be in a rectification or inversion state, the rectification power is greater than the inversion power, the system is used for simulating the working condition that a traction power supply system simultaneously generates a traction locomotive and a regenerative braking locomotive, the traction power is greater than the regenerative power, and the equivalent traction power supply system is in a power consumption working condition at the moment.
S2.2a closes a left power supply arm equivalent locomotive direct current breaker K10, a right power supply arm equivalent locomotive direct current breaker K12, and a control system controls four-quadrant converters C7 and C8 to be in an inversion state through control pulse signals controlling the four-quadrant converters C7 and C8 and is used for simulating a regenerative braking working condition of the locomotive, and at the moment, an equivalent traction power supply system is in a return power working condition.
S2.2b closes a left power supply arm equivalent locomotive direct current breaker K9, a right power supply arm equivalent locomotive direct current breaker K12, or closes a left power supply arm equivalent locomotive direct current breaker K10, a right power supply arm equivalent locomotive direct current breaker K11, a control system controls a four-quadrant converter C7 and a control pulse signal of the C8 to control the four-quadrant converter C7 and the C8 to be in a rectification or inversion state, the rectification power is smaller than the inversion power, the control system is used for simulating the working condition that a traction power supply system simultaneously generates a traction locomotive and a regenerative braking locomotive, the traction power is smaller than the regenerative power, and the equivalent traction power supply system is in a return power working condition.
The method comprises the following steps of carrying out load transfer process, energy storage device discharge process and new energy power generation device discharge process on a back-to-back converter device when an equivalent traction power supply system is in a power consumption working condition, wherein the specific steps comprise:
and S3.1, controlling the simulated traction power supply system to be in a power consumption working condition according to the step S2.1a or S2.1b.
And S3.2a, when the equivalent traction power supply system is in a power consumption working condition, judging whether the residual energy of the energy storage medium meets a discharging condition by the control system, if so, calculating the discharging reference power of the energy storage device, and otherwise, setting the discharging reference power of the energy storage device to be 0.
And S3.2b, when the equivalent traction power supply system is in a power consumption working condition, judging whether the new energy power generation device meets a discharge condition by the control system, if so, calculating the discharge reference power of the new energy power generation device, and otherwise, setting the reference power of the new energy power generation device to be 0.
And S3.3, calculating active reference power of the four-quadrant converters C1 and C2, reference power of the bidirectional DC/DC converters C3 and C4 and reference power of the unidirectional DC/DC converter C5 according to the discharge reference power of the energy storage device and the new energy power generation device.
And the S3.4 control system controls the bidirectional DC/DC converters C3 and C4, the reference power of the unidirectional DC/DC converter C5 and the active reference power of the four-quadrant converters C1 and C2 according to the reference power of the energy storage device and the new energy power generation device, adjusts a control pulse signal, and transfers the energy released by the energy storage media S1 and S2 and the new energy power generation unit D1 to the left and right power supply arms through the back-to-back converter device for equivalent locomotive traction consumption.
The equivalent draws the transfer process of power supply system back-to-back deflector to load when being in the power back-off operating mode, the charging process of energy memory, the discharge process of contravariant feedback device, and concrete step includes:
and S4.1, controlling the simulated traction power supply system to be in a return power working condition according to the step S2.2a or S2.2b.
S4.2a when the equivalent traction power supply system is in a return power working condition, the control system judges whether the residual capacity of the energy storage medium meets a charging condition, if so, the charging reference power of the energy storage device is calculated, and otherwise, the charging reference power of the energy storage device is set to be 0.
And S4.3b, when the equivalent traction power supply system is in a feedback power working condition, the control system judges whether the inversion feedback device meets an inversion feedback condition, if so, the discharge reference power of the inversion feedback device is calculated, and otherwise, the discharge reference power of the inversion feedback device is set to be 0.
S4.3, calculating the reference power of the bidirectional DC/DC converters C3 and C4, the active reference power of the four-quadrant converters C1 and C2 and the active reference power of the DC/AC converter C6 according to the charging reference power of the energy storage device and the reference power of the inversion feedback device,
and S4.4, the control system controls the reference power to the DC/DC converters C3 and C4, the active reference power of the four-quadrant converters C1 and C2 and the active reference power of the DC/AC converter C6 according to the reference power of the energy storage device and the inversion feedback device, adjusts a control pulse signal, and stores the regenerative braking energy on the left and right power supply arms into energy storage media S1 and S2 and feeds back the regenerative braking energy to the adjustable load L1.
The control system of S5 determines whether to issue a shutdown command, if so, executes step 6, otherwise executes step S3.1 or S4.1. And S6, disconnecting all the alternating current contactors and the circuit breakers, and shutting down the experiment platform.
Claims (6)
1. An experimental platform of a high-speed rail comprehensive energy utilization system is characterized by comprising an equivalent traction power supply system, a left equivalent locomotive, a right equivalent locomotive, a back-to-back converter device, an energy storage device, a new energy power generation device, an inversion feedback device and a control system;
the equivalent traction power supply system comprises traction transformers T1 and T2 and autotransformers AT1, AT2, AT3 and AT 4;
two ends of a primary side of the T1 are respectively connected to an A phase and a B phase of a three-phase power grid, two ends of a secondary side of the T1 are respectively connected to a contact line and a positive feeder of a left power supply arm, and a middle end of the secondary side of the T1 is connected to a steel rail; two ends of a primary side of the T2 are respectively connected to a phase C and a phase B of a three-phase power grid, two ends of a secondary side of the T2 are respectively connected to a contact line and a positive feeder of a right power supply arm, and a middle end of the secondary side of the T2 is connected to a steel rail; two ends of AT1 and AT2 are respectively connected to a contact line and a positive feeder of the left power supply arm, and the middle end is connected to a steel rail; two ends of AT3 and AT4 are respectively connected to a contact line and a positive feeder of the right power supply arm, and the middle end is connected to a steel rail;
the left equivalent locomotive comprises an isolation transformer T5, a pre-charging module P3, a four-quadrant converter C7, an adjustable load L2 and a direct-current power supply D2; the input end of the T5 is connected to the left power supply arm, the output end is connected to the AC side of the C7 through the P3, and the DC side of the C7 is connected to the L2 and the D2 through the DC breakers K9 and K10 respectively; the P3 comprises an alternating current breaker K7 and a pre-charging resistor R3 which are connected in series, and an alternating current contactor KM3 is also connected in parallel with the R3;
the right equivalent locomotive comprises an isolation transformer T6, a pre-charging module P4, a four-quadrant converter C8, an adjustable load L3 and a direct-current power supply D3; the input end of the T6 is connected to the right power supply arm, the output end is connected to the AC side of the C8 through the P4, and the DC side of the C8 is connected to the L3 and the D3 through the DC breakers K11 and K12 respectively; the P4 comprises an alternating current breaker K8 and a pre-charging resistor R4 which are connected in series, and an alternating current contactor KM4 is also connected in parallel with the R4;
the back-to-back converter device comprises isolation transformers T3 and T4, pre-charging modules P1 and P2, and four-quadrant converters C1 and C2; the input end of the T3 is connected to the left power supply arm, and the output end is connected to the alternating current side of the C1 through the P1; the input end of the T4 is connected to the right power supply arm, and the output end is connected to the alternating current side of the C2 through the P2; the P1 comprises an alternating current breaker K1 and a pre-charging resistor R1 which are connected in series, and an alternating current contactor KM1 is also connected in parallel with the R1; the P2 comprises an alternating current breaker K2 and a pre-charging resistor R2 which are connected in series, and an alternating current contactor KM2 is also connected in parallel with the R2;
the energy storage device comprises a bidirectional DC/DC converter C3 and an energy storage medium S1; one end of the C3 is connected to the DC sides of the C1 and the C2 through an AC breaker K3, and the other end is connected to S1; the energy-saving device also comprises a bidirectional DC/DC converter C4 and an energy storage medium S2; one end of the C4 is connected to the DC sides of the C1 and C2 through a DC breaker K4, and the other end is connected to S2;
the new energy power generation device comprises a unidirectional DC/DC converter C5 and a new energy unit D1; one end of the C5 is connected to the DC sides of the C1 and C2 through a DC breaker K5, and the other end is connected to D1;
the inversion feedback device comprises a bidirectional DC/AC converter C6 and an adjustable load L1; one end of the C6 is connected to the DC sides of the C1 and C2 through a DC breaker K6, and the other end is connected to L1;
the control system is respectively connected to the left equivalent locomotive, the right equivalent locomotive, the back-to-back converter, the energy storage device, the new energy power generation device and the inversion feedback device.
2. The experimental platform of the high-speed rail comprehensive energy utilization system as claimed in claim 1, wherein the energy storage medium S1 is any one of a super capacitor, a storage battery and a lithium battery, and the energy storage medium S2 is any one of a super capacitor, a storage battery and a lithium battery.
3. The experimental platform of the comprehensive energy utilization system for high-speed rails as claimed in claim 1, wherein the new energy unit D1 is a photovoltaic or fuel cell.
4. The experimental platform for the comprehensive energy utilization system of the high-speed rail as claimed in claim 1, further comprising a monitoring system; the monitoring system is respectively connected to the control system, the left equivalent locomotive, the right equivalent locomotive, the back-to-back converter, the energy storage device, the new energy power generation device and the inversion feedback device.
5. The experimental platform for the comprehensive energy utilization system of the high-speed rail as claimed in claim 1, further comprising a protection system; the protection system is respectively connected to the control system, the left equivalent locomotive, the right equivalent locomotive, the back-to-back converter device, the energy storage device, the new energy power generation device and the inversion feedback device.
6. The experimental method of the experimental platform of the comprehensive energy utilization system for the high-speed rail as claimed in claim 1, comprising
Step 1: preparation of experimental platform, specifically
Closing alternating current breakers K1, K2, K7 and K8, and pre-charging direct current side capacitors of the four-quadrant converters C1, C2, C7 and C8;
when the direct-current side voltage reaches a set threshold value, closing alternating-current contactors KM1, KM2, KM3 and KM4 to enable the direct-current side voltages of the four-quadrant converters C1, C2, C7 and C8 to rise to the rated voltage of uncontrolled rectification; the control system sends out control pulse signals to control the four-quadrant converters C1, C2, C7 and C8 to be in a no-load running state;
closing the direct current circuit breakers K3, K4, K5 and K6, and keeping the energy storage device, the new energy power generation device and the inversion feedback device in a standby state at the moment;
step 2: making the equivalent traction power supply system in a power consumption working condition or a power return working condition, wherein
The method for enabling the equivalent traction power supply system to be in the power consumption working condition comprises the following steps:
closing the direct current circuit breakers K9 and K11, controlling the four-quadrant converters C7 and C8 to be in a rectification state by a control system through controlling control pulse signals of the four-quadrant converters C7 and C8, and simulating the traction working condition of the locomotive to enable the equivalent traction power supply system to be in a power consumption working condition;
or, the direct current circuit breakers K9 and K12 are closed, the control system controls the four-quadrant converter C7 to be in a rectification state and the four-quadrant converter C8 to be in an inversion state by controlling control pulse signals of the four-quadrant converter C7 and C8, the rectification power is greater than the inversion power, the control system is used for simulating the working condition that the equivalent traction power supply system simultaneously generates a traction locomotive and a regenerative braking locomotive, and the traction power is greater than the regenerative power so that the equivalent traction power supply system is in a power consumption working condition;
or, the direct current circuit breakers K10 and K11 are closed, the control system controls the four-quadrant converter C7 to be in an inversion state and the four-quadrant converter C8 to be in a rectification state by controlling control pulse signals of the four-quadrant converter C7 and C8, the rectification power is greater than the inversion power, the control system is used for simulating the working condition that the equivalent traction power supply system simultaneously generates a traction locomotive and a regenerative braking locomotive, and the traction power is greater than the regenerative power so that the equivalent traction power supply system is in a power consumption working condition;
the method for enabling the equivalent traction power supply system to be in the working condition of the return power comprises the following steps:
closing the direct current circuit breakers K10 and K12, controlling the four-quadrant converters C7 and C8 to be in an inversion state by a control system through controlling control pulse signals of the four-quadrant converters C7 and C8, and simulating a regenerative braking working condition of the locomotive to enable the equivalent traction power supply system to be in a return power working condition;
or, the direct current circuit breakers K9 and K12 are closed, the control system controls the four-quadrant converter C7 to be in a rectification state and the four-quadrant converter C8 to be in an inversion state by controlling control pulse signals of the four-quadrant converter C7 and C8, the rectification power is smaller than the inversion power, the control system is used for simulating the working condition that the equivalent traction power supply system simultaneously generates a traction locomotive and a regenerative braking locomotive, and the traction power is smaller than the regenerative power so that the equivalent traction power supply system is in a return power working condition;
or, the direct current circuit breakers K10 and K11 are closed, the control system controls the four-quadrant converter C7 to be in an inversion state and the four-quadrant converter C8 to be in a rectification state by controlling control pulse signals of the four-quadrant converter C7 and C8, the rectification power is smaller than the inversion power, the control system is used for simulating the working condition that the equivalent traction power supply system simultaneously generates a traction locomotive and a regenerative braking locomotive, and the traction power is smaller than the regenerative power so that the equivalent traction power supply system is in a return power working condition;
when the equivalent traction power supply system is in a power consumption working condition, executing the step 3 as follows:
the control system judges whether the residual energy of the energy storage media S1 and S2 meets the discharging condition; if so, calculating the discharge reference power of the energy storage device, otherwise, setting the discharge reference power of the energy storage device to be 0;
the control system judges whether the new energy power generation device meets a discharging condition; if so, calculating the discharge reference power of the new energy power generation device, otherwise, setting the discharge reference power of the new energy power generation device to be 0;
according to the discharging reference power of the energy storage device and the new energy power generation device, calculating active reference power of the four-quadrant converters C1 and C2, and calculating reference power of the bidirectional DC/DC converters C3 and C4 and the unidirectional DC/DC converter C5;
the control system controls active reference power of the four-quadrant converters C1 and C2 and controls reference power of the bidirectional DC/DC converters C3 and C4 and the unidirectional DC/DC converter C5 according to reference power of the energy storage device and the new energy power generation device; adjusting the control pulse signal, and transferring the energy released by the energy storage media S1 and S2 and the new energy power generation unit D1 to the left and right power supply arms through a back-to-back converter device for equivalent locomotive traction consumption;
when the equivalent traction power supply system is in the foldback power working condition, executing the step 3', as follows:
the control system judges whether the residual capacities of the energy storage media S1 and S2 meet the charging condition; if so, calculating the charging reference power of the energy storage device, otherwise, setting the charging reference power of the energy storage device to be 0;
the control system judges whether the inversion feedback device meets the inversion feedback condition; if so, calculating the discharge reference power of the inversion feedback device, otherwise, setting the discharge reference power of the inversion feedback device to be 0;
according to the charging reference power of the energy storage device and the discharging reference power of the inversion feedback device, controlling the reference power of the bidirectional DC/DC converters C3 and C4, the active reference power of the four-quadrant converters C1 and C2 and the active reference power of the DC/AC converter C6; and regulating the control pulse signal, and storing the regenerative braking energy on the left and right power supply arms into energy storage media S1 and S2 and feeding back to an adjustable load L1.
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