CN109449963B - Capacity allocation and control method of hybrid regenerative electric energy absorption and utilization device - Google Patents
Capacity allocation and control method of hybrid regenerative electric energy absorption and utilization device Download PDFInfo
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/28—Arrangements for balancing of the load in a network by storage of energy
- H02J3/32—Arrangements for balancing of the load in a network by storage of energy using batteries with converting means
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
- B60L7/00—Electrodynamic brake systems for vehicles in general
- B60L7/10—Dynamic electric regenerative braking
- B60L7/16—Dynamic electric regenerative braking for vehicles comprising converters between the power source and the motor
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/60—Other road transportation technologies with climate change mitigation effect
- Y02T10/72—Electric energy management in electromobility
Abstract
The invention particularly relates to a capacity configuration and control method of a hybrid regenerative electric energy absorption and utilization device, which comprises a capacity configuration method and a control method of the hybrid regenerative electric energy absorption and utilization device based on the capacity configuration method. The capacity configuration method comprises the following steps: the power of the medium-voltage looped network and the peak power of the train regenerative electric energy are obtained, the capacity Pinv of the inversion absorption device in the hybrid absorption device is determined, and the power capacity Psto of the energy storage absorption part in the hybrid absorption device is determined. The control method comprises the following steps: the input state of the hybrid regenerative electric energy absorption and utilization device is determined based on the capacity allocation. The invention aims at solving the problems of high cost and large occupied area of a regenerative electric energy absorption device when the regenerative electric energy is completely absorbed in the existing single regenerative electric energy absorption and utilization scheme.
Description
Technical Field
The invention relates to the field of electric energy storage, electric energy inversion and automatic control, in particular to a capacity configuration and control method of a hybrid regenerative electric energy absorption and utilization device.
Background
The urban rail transit traction power supply adopts a traction power supply mode of getting power from a medium-voltage 10kV or 35kV power grid, reducing the voltage through a rectifier transformer and providing 1500V or 750V for a direct-current traction network through a diode rectifier bridge. The train control system has the characteristics of simple structure and lower cost, but the direct-current voltage is uncontrollable, the fluctuation range is large, and the performance of the train is not favorably exerted; meanwhile, the energy of the diode rectifier bridge can only be transmitted in one direction, redundant electric energy generated by the regenerative braking of the train cannot be fed back to the alternating current power grid, and the redundant electric energy needs to be completely absorbed or consumed, otherwise, the regenerative braking function is quitted, and the stable braking of the train is influenced. A typical train regenerative power curve is similar to a trapezoid in shape and is characterized by high peak power (peak power can reach 4-6MW), high braking energy (primary braking energy can exceed 10kWh), short braking duration and periodic intermittent operation.
The absorption or consumption technical scheme commonly used at present generally comprises three types, namely a resistance consumption type, an inversion feedback type and an energy storage absorption type. The resistor-consumption type uses the brake resistor to consume the regenerative electric energy, which causes waste of energy. In addition, the heating of the brake resistor can also cause the temperature of the tunnel to rise, increase the burden of an environment control system and cause the re-consumption of energy.
The novel energy-saving regenerative electric energy absorption and utilization scheme is an inversion feedback type and an energy storage absorption type. The inversion feedback type adopts a high-power inverter to invert and feed the regenerated electric energy back to an alternating current ring network for use by other electric loads in a subway power supply system, and is characterized in that the regenerated energy does not need to be stored (directly consumed by a subway medium-voltage ring network), the capacity of equipment is determined by the peak power absorbed by the equipment, and when the regenerated electric energy is absorbed by adopting an independent inversion feedback scheme, the capacity of the equipment is very large if the equipment completely absorbs the regenerated electric energy, so that the cost is not economical, and the size is very large. In addition, the peak value of the regenerated power of inversion may exceed the consumption capability of the medium-voltage ring network of the subway, so that a part of regenerated electric energy is sent back to the electric power system, and impact and influence are caused on the electric power system.
The energy storage absorption type stores the regenerated electric energy in the energy storage media such as super capacitor or battery through the high-power DC-DC converter, and releases and supplies the regenerated electric energy to the train when the train is drawn, so as to realize complete local consumption of the regenerated electric energy.
The prior art application number is: 201410618141.X, the invention name is: a mixed regenerative energy recovery method and device for an urban rail power supply system disclose a regenerative electric energy absorption mode of mixing an inversion feedback type and a super capacitor type, but the inversion feedback type and the super capacitor type work in a time-sharing mode, the inversion feedback type works when a power grid is normal, and the super capacitor type works only when the power grid is abnormal, so that the two types of absorption modes are mutually standby modes, each type of device needs to have capacity for completely absorbing regenerative electric energy, each type of device needs to be configured with large capacity, and when the inversion feedback type works alone, a situation that a medium-voltage ring network cannot absorb the regenerative electric energy and the regenerative electric energy is transmitted to a power system reversely can occur. The application numbers are: 201210579214.X, the invention name is: in the method, a super capacitor and an inversion feedback type are adopted to be matched with each other for absorption, a mode that the super capacitor works to absorb basic part of power firstly after the direct current network voltage reaches a first voltage and then works to feed back and absorb peak part of power after the direct current network voltage reaches a second voltage is provided, the method requires that a super capacitor device needs to be configured with larger storage capacity, and the inversion feedback device needs to be configured with larger peak absorption capacity, so that the cost and size optimization of the system are limited. In addition, this method does not describe how to properly design and select the capacity of super capacitor and inverter feedback type devices.
Disclosure of Invention
1. The technical problem to be solved is as follows:
in view of the above-mentioned technical problems, the present invention provides a capacity allocation and control method for a hybrid regenerative electric energy absorption and utilization device, which includes providing optimized matching absorption methods for two absorption devices according to the characteristics of an energy storage type absorption device and an inversion feedback type absorption device, and how to select and allocate the capacities of the two absorption devices based on the optimized matching absorption method. The invention utilizes the characteristics that the inverter device has large absorbed electric energy (strong power grid consumption capacity) and the energy storage device has small absorbed electric energy capacity but can be consumed on site, realizes the optimization of absorption effect, system cost and floor area by reasonably designing the absorption range and function of the energy storage device and the inverter feedback device, and simultaneously avoids the problem of transferring the regenerated electric energy to the power system.
2. The technical scheme is as follows:
a capacity allocation and control method of a hybrid regenerative electric energy absorption and utilization device is characterized in that: the method comprises a capacity allocation method and a control method of a hybrid regenerative electric energy absorption and utilization device based on the capacity allocation method.
The capacity configuration method comprises the following steps: the method comprises the following steps: obtaining the power of the medium-voltage ring network and the peak power of the train regenerative electric energy: and obtaining the maximum peak power Pimax of the regenerative power according to a power curve of the regenerative braking of the vehicle, and obtaining the average active power Pgave of the subway medium-voltage ring network in the driving time period according to the power of a 110kV/35kV main transformer in the main substation.
Step two: determining the capacity Pinv of an inversion absorption device in the hybrid absorption device: according to the Pimax and the Pgain values obtained in the first step, when Pgain < Pimax indicates that the power peak value of regenerative braking of the train can exceed the average absorption power of the medium-voltage ring network of the subway, the capacity Pinv = K1 Pgain of the inversion absorption part is set, wherein K1 is a value which is less than or equal to 1 and greater than 0, and therefore the regenerative power of the inversion absorption can be completely absorbed by the medium-voltage ring network; when Pgave > Pimax indicates that the average absorption capacity of the medium-voltage ring network of the subway can absorb the peak power of the regenerative braking of the train, the capacity of the inversion absorption part Pinv = K2 Pimax is set, wherein K2 is a value smaller than 1 and larger than 0.
Step three: determining the power capacity Psto of the energy storage absorption part in the hybrid absorption device: according to the Pinv value obtained in the step two, the energy storage part absorbs the rest regenerative power to obtain the Psto of the energy storage part; namely, when Pgave < Pimax, the energy storage absorbing partial power Psto = Pimax-K1 × Pgave; when Pgave > Pimax, the storage absorption partial power Psto = Pimax-K2 × Pimax.
Step four: select K1 and K2 values: k1=0.5 or K2=0.5 is selected, the maximum absorption power of the energy storage part and the maximum absorption power of the inversion part are the same, the inversion part absorbs about 3/4 of the total regenerated electric energy, and the energy storage part absorbs about only 1/4 of the total regenerated electric energy, so that the optimal configuration of the energy storage coordination capacity is realized.
A control method of the hybrid regenerative electric energy absorption and utilization device based on the capacity allocation method; the method comprises the following steps:
step five: setting a mixed type regenerative electric energy absorption and utilization device; the regenerative electric energy absorption and utilization device comprises an inversion feedback device and an energy storage device; the direct current access sides of the inversion feedback device and the energy storage device are connected in parallel and then are connected to a direct current traction network; the AC output feedback of the inversion feedback device is connected to an AC power grid through a transformer; the direct current output of the energy storage device is connected to the power type energy storage unit; the power type energy storage unit is a super capacitor or/and power type battery pack; the main controller samples and detects the voltage of the direct current traction network, the voltage of the alternating current power network, the state and the voltage current of the energy storage part device, the state and the voltage current of the inversion part device and controls the coordination work of the inversion part device and the energy storage part device.
Step six: if the sampled real-time direct current traction network voltage is larger than a first voltage preset value Vth1, the main controller sends a starting signal to the inversion feedback device, and the inversion feedback device is put into an energy absorption state of the inversion feedback device based on the process from the first step to the fourth step; the main controller samples the voltage of the direct current traction network after the inversion feedback device absorbs energy, and if the voltage of the direct current traction network is larger than a second voltage preset value Vth2, the main controller sends a starting signal to the energy storage device, and the energy storage device performs energy absorption by the energy storage device based on the processes of the first step to the fourth step; where Vth2 is greater than Vth 1.
When the inversion feedback device enters an energy absorption state, the inversion feedback device adopts a control strategy of a voltage outer ring and a current inner ring, and the voltage of the direct current traction network is stabilized to be Vth1 while regenerative electric energy is fed back to the medium-voltage ring network within the capacity Pinv of the inversion feedback device.
When the energy storage device enters an energy absorption state, the energy storage device adopts a control strategy of a voltage outer ring and a current inner ring, and in the power Psto of the energy storage device, regenerative electric energy is fed back and absorbed into an energy storage medium, and meanwhile, the voltage of a direct current traction network is stabilized to be Vth 2. Step seven: the main controller samples the direct current traction network voltage when the inversion feedback device and the energy storage device are both put into the energy absorption, and if the direct current traction network voltage at the moment becomes smaller and the current of the energy storage device is reduced to zero, the energy storage device withdraws from the energy absorption.
After the controller judges that the energy storage device withdraws from absorbing energy, whether the voltage of the direct current traction network is stable and whether the absorption current of the inversion feedback device is zero or not is judged; if the absorption current of the inversion feedback device is zero at the moment, the regenerative braking power is reduced to zero, the inversion feedback device quits the absorption energy, namely the hybrid regenerative electric energy absorption and utilization device quits the regenerative electric energy absorption process.
Step eight: if the voltage of the direct current traction network is smaller than a third voltage preset value Vth3, wherein Vth3 is smaller than Vth1, the main controller sends an energy release signal to the energy storage device, and the energy storage device releases the stored energy to the direct current traction network.
Further, when the energy storage device is in an energy release state, after all the electric energy is released, the energy storage device quits to operate and waits for the next regenerative energy absorption process.
3. Has the advantages that:
the invention provides an optimal configuration method of a hybrid regenerative electric energy absorption and utilization system and a coordination control method thereof aiming at the problems of high cost and large occupied area of a regenerative electric energy absorption device when the regenerative electric energy is completely absorbed in the existing single regenerative electric energy absorption and utilization scheme. By the scheme, the regenerative electric energy can be completely absorbed, the regenerative electric energy which is sent back to the power system is eliminated, and meanwhile, the cost and the floor area of the system can be optimized.
Drawings
Fig. 1 is a structural view of a hybrid regenerative electric energy absorption device of the present invention;
FIG. 2 is a flow chart of the regenerative electric energy absorption apparatus according to the present invention for absorbing energy;
FIG. 3 is a flow chart of the regenerative energy absorption device of the present invention for releasing regenerative energy;
fig. 4 is a power curve of regenerative power used in the example.
Detailed Description
The present invention will be described in detail with reference to the accompanying drawings.
A capacity allocation and control method of a hybrid regenerative electric energy absorption and utilization device is characterized in that: the method comprises a capacity allocation method and a control method of a hybrid regenerative electric energy absorption and utilization device based on the capacity allocation method.
The capacity configuration method comprises the following steps: the method comprises the following steps: obtaining the power of the medium-voltage ring network and the peak power of the train regenerative electric energy: and obtaining the maximum peak power Pimax of the regenerative power according to a power curve of the regenerative braking of the vehicle, and obtaining the average active power Pgave of the subway medium-voltage ring network in the driving time period according to the power of a 110kV/35kV main transformer in the main substation.
Step two: determining the capacity Pinv of an inversion absorption device in the hybrid absorption device: according to the Pimax and the Pgain values obtained in the first step, when Pgain < Pimax indicates that the power peak value of regenerative braking of the train can exceed the average absorption power of the medium-voltage ring network of the subway, the capacity Pinv = K1 Pgain (K1 is a value which is less than or equal to 1 and greater than 0) of the inversion absorption device is set, so that the regenerative power of inversion absorption can be completely absorbed by the medium-voltage ring network; when Pgave > Pimax indicates that the average absorption capacity of the medium-voltage ring network of the subway can absorb the peak power of the regenerative braking of the train, the capacity Pinv of the inversion absorption part is set to be K2 Pimax (K2 is a value smaller than 1 and larger than 0).
Step three: determining the power capacity Psto of the energy storage absorption part in the hybrid absorption device: and according to the Pinv value obtained in the step two, the residual regenerative power is absorbed by the energy storage part to obtain the Psto of the energy storage part. Namely, when Pgave < Pimax, the energy storage absorbing partial power Psto = Pimax-K1 × Pgave; when Pgave > Pimax, the storage absorption partial power Psto = Pimax-K2 × Pimax.
Step four: select K1 and K2 values: through the three steps, the regenerative braking power of the train can be completely absorbed and cannot be sent back to the power system. And the optimal distribution of the regenerated electric energy power between the energy storage absorption part and the inversion absorption part can be realized by selecting the K1 and K2 values, so that the optimization of the system cost and the floor area is realized. The regenerative braking power curve can be equivalent to an equilateral triangle, and the energy storage medium in the energy storage absorption part is high in price and large in occupied area, so that the energy storage absorption part only absorbs the peak part of the regenerative power triangle, and the inversion absorption part absorbs the basic part of the regenerative power triangle. When K1=0.5 or K2=0.5 is selected, the maximum absorption power of the energy storage part and the inversion part is the same, but the inversion part absorbs about 3/4 of the total regenerated electric energy, and the energy storage part absorbs about only 1/4 of the total regenerated electric energy, so that the optimal configuration of the energy storage coordination capacity is realized.
A control method of a track traffic mixed type regenerative electric energy absorption and utilization device; the flow chart is shown in the attached figures 2 and 3.
Step five: the hybrid regenerative electric energy absorption and utilization device is arranged as shown in the attached figure 1; the regenerative electric energy absorption device comprises an inversion feedback device and an energy storage device; the direct current access sides of the inversion feedback device and the energy storage device are connected in parallel and then are connected to a direct current traction network; the AC output feedback of the inversion feedback device is connected to an AC power grid through a transformer; the direct current output of the energy storage device is connected to the power type energy storage unit; the power type energy storage unit is a super capacitor or/and power type battery pack; the main controller samples and detects the voltage of the direct current traction network, the voltage of the alternating current power network, the state and the voltage current of the energy storage part device, the state and the voltage current of the inversion part device and controls the coordination work of the inversion part device and the energy storage part device.
Step six: if the sampled real-time direct current traction network voltage is larger than a first voltage preset value Vth1, the main controller sends a starting signal to the inversion feedback device, and the inversion feedback device is put into an energy absorption state of the inversion feedback device based on the process from the first step to the fourth step; the main controller samples the voltage of the direct current traction network after the inversion feedback device absorbs energy, and if the voltage of the direct current traction network is larger than a second voltage preset value Vth2, the main controller sends a starting signal to the energy storage device, and the energy storage device performs energy absorption by the energy storage device based on the processes of the first step to the fourth step; where Vth2 is greater than Vth 1.
When the inversion feedback device enters an energy absorption state, the inversion feedback device adopts a control strategy of a voltage outer ring and a current inner ring, and the voltage of the direct current traction network is stabilized to be Vth1 while regenerative electric energy is fed back to the medium-voltage ring network within the capacity Pinv of the inversion feedback device.
When the energy storage device enters an energy absorption state, the energy storage device adopts a control strategy of a voltage outer ring and a current inner ring, and in the power Psto of the energy storage device, regenerative electric energy is fed back and absorbed into an energy storage medium, and meanwhile, the voltage of a direct current traction network is stabilized to be Vth 2. Step seven: the main controller samples the direct current traction network voltage when the inversion feedback device and the energy storage device are both put into the energy absorption, and if the direct current traction network voltage at the moment becomes smaller and the current of the energy storage device is reduced to zero, the energy storage device withdraws from the energy absorption.
After the controller judges that the energy storage device withdraws from absorbing energy, whether the voltage of the direct current traction network is stable and whether the absorption current of the inversion feedback device is zero or not is judged; if the absorption current of the inversion feedback device is zero at the moment, the regenerative braking power is reduced to zero, the inversion feedback device quits absorbing energy, and the hybrid regenerative electric energy absorption device quits the regenerative electric energy absorption process.
Step eight: if the voltage of the direct current traction network is smaller than a third voltage preset value Vth3, wherein Vth3 is smaller than Vth1, the main controller sends an energy release signal to the energy storage device, and the energy storage device releases the stored energy to the direct current traction network.
Further, when the energy storage device is in an energy release state, after all the electric energy is released, the energy storage device quits to operate and waits for the next regenerative energy absorption process.
The specific embodiment is as follows:
fig. 4 shows a typical regenerative power curve, which has a peak power value of 2200kW and a total amount of 8.6kWh, and the average active power of the main transformer of the main substation of the subway is about 1200 kW.
If a single inversion feedback device is adopted to completely absorb the regenerated electric energy, the capacity of the inversion device needs to be configured according to the 2200kW rated capacity, and the peak power of the regeneration inversion exceeds the average power of a main substation, so that part of regenerated power cannot be absorbed and is sent to a power system; if a single energy storage absorption device is adopted to completely absorb the regenerated electric energy, the energy storage device needs to be configured with 2200kW/8.6kWh of energy storage medium, and the device is large in size and high in cost.
By adopting the configuration method, the inversion feedback device of 1100kW can be adopted to absorb the basic power part within 1100kW, and the energy storage absorption device scheme of 1100kW/2.4kWh is simultaneously configured to absorb the peak power part with the power exceeding 1100kW, so that the hybrid absorption is realized, the inversion part absorbs about 6.3kWh of the electric energy of the basic part, and the energy storage part absorbs about 2.3kWh of the electric energy of the peak part. Compared with a single 2200kW inversion feedback device and a single 2200kW/8.6kWh energy storage and absorption device, the hybrid regeneration and absorption device provided by the method can completely absorb the regenerated electric energy, simultaneously eliminates the situation that the regenerated electric energy is sent back to a power grid, and optimizes the system cost and the occupied area.
As shown in fig. 2, in the DC1500V traction power supply system, when the voltage of the DC traction network is greater than Vth1 (set to 1720V), the inverter feedback device starts to operate, the regenerative power is independently absorbed by the inverter device within a range of less than 1100kW, and the voltage of the DC traction network is stabilized at Vth 1. When the regenerative power is increased to be over 1100kW, the inverter device keeps absorbing the rated power of 1100kW, and when the voltage of the direct-current traction network rises to reach Vth2 (set to be 1770V), the energy storage absorption device starts to operate and absorbs the regenerative electric energy of over 1100kW, and at the moment, the inverter feedback device and the energy storage device absorb the regenerative electric energy together to stabilize the network voltage of the traction network at Vth 2.
When the regenerative power is reduced, the inversion feedback device keeps 1100kW absorption and the absorption current of the energy storage device is gradually reduced, and when the absorption current of the energy storage device is judged to be zero or the energy storage device is completely filled, the energy storage device is quitted to operate; and after the energy storage device is withdrawn from operation, the inverter device independently absorbs the regenerated electric energy.
It can be seen that the energy storage device only absorbs a small part of the electric energy in the upper half hatched portion in fig. 4, and most of the electric energy in the lower half hatched portion is absorbed by the inverter device.
When a train is pulled, when the voltage of the direct current traction network is reduced to Vth3 (set to 1600V), the energy storage device enters an energy release mode, stored electric energy is released to the direct current traction network, after all the electric energy is released, the energy storage device quits operation, and the system waits for the next regenerative electric energy absorption process.
Although the present invention has been described with reference to the preferred embodiments, it should be understood that various changes and modifications can be made therein by those skilled in the art without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (2)
1. A capacity allocation and control method of a hybrid regenerative electric energy absorption and utilization device is characterized in that: the control method comprises a capacity configuration method and a control method of a hybrid regenerative electric energy absorption and utilization device based on the capacity configuration method;
the capacity configuration method comprises the following steps:
the method comprises the following steps: obtaining the power of the medium-voltage ring network and the peak power of the train regenerative electric energy: obtaining the maximum peak power Pimax of the regenerative power according to a power curve of the regenerative braking of the vehicle, and obtaining the average active power Pgave of the subway medium-voltage ring network in the driving time period according to the power of a 110kV/35kV main transformer in a main substation;
step two: determining the capacity Pinv of an inversion absorption device in the hybrid absorption device: according to the Pimax and the Pgain values obtained in the first step, when Pgain < Pimax indicates that the power peak value of regenerative braking of the train can exceed the average absorption power of the medium-voltage ring network of the subway, the capacity Pinv = K1 Pgain of the inversion absorption part is set, wherein K1 is a value which is less than or equal to 1 and greater than 0, and therefore the regenerative power of the inversion absorption can be completely absorbed by the medium-voltage ring network; when Pgave > Pimax indicates that the average absorption capacity of the medium-voltage ring network of the subway can absorb the peak power of the regenerative braking of the train, the capacity Pinv = K2 × Pimax of the inversion absorption part is set, wherein K2 is a value smaller than 1 and larger than 0;
step three: determining the power capacity Psto of the energy storage absorption part in the hybrid absorption device: according to the Pinv value obtained in the step two, the energy storage part absorbs the rest regenerative power to obtain the Psto of the energy storage part; namely, when Pgave < Pimax, the energy storage absorbing partial power Psto = Pimax-K1 × Pgave; when Pgave > Pimax, the storage energy absorption partial power Psto = Pimax-K2 × Pimax;
step four: select K1 and K2 values: when K1=0.5 or K2=0.5 is selected, the maximum absorption power of the energy storage part and the maximum absorption power of the inversion part are the same, but the inversion part absorbs about 3/4 of the total regenerated electric energy, and the energy storage part only absorbs about 1/4 of the total regenerated electric energy, so that the optimal configuration of the energy storage coordination capacity is realized;
a control method of the hybrid regenerative electric energy absorption and utilization device based on the capacity allocation method; the method comprises the following steps:
step five: setting a mixed type regenerative electric energy absorption and utilization device; the regenerative electric energy absorption and utilization device comprises an inversion feedback device and an energy storage device; the direct current access sides of the inversion feedback device and the energy storage device are connected in parallel and then are connected to a direct current traction network; the AC output feedback of the inversion feedback device is connected to an AC power grid through a transformer; the direct current output of the energy storage device is connected to the power type energy storage unit; the power type energy storage unit is a super capacitor or/and power type battery pack; the main controller samples and detects the voltage of a direct current traction network, the voltage of an alternating current power grid, the state and the voltage current of an energy storage part device, the state and the voltage current of an inversion part device and controls the coordination work of the inversion part device and the energy storage part device;
step six: if the sampled real-time direct current traction network voltage is larger than a first voltage preset value Vth1, the main controller sends a starting signal to the inversion feedback device, and the inversion feedback device is put into an energy absorption state of the inversion feedback device based on the process from the first step to the fourth step; the main controller samples the voltage of the direct current traction network after the inversion feedback device absorbs energy, and if the voltage of the direct current traction network is larger than a second voltage preset value Vth2, the main controller sends a starting signal to the energy storage device, and the energy storage device performs energy absorption by the energy storage device based on the processes of the first step to the fourth step; wherein Vth2 is greater than Vth 1;
when the inversion feedback device enters an energy absorption state, the inversion feedback device adopts a control strategy of a voltage outer ring and a current inner ring, and the voltage of the direct current traction network is stabilized to be Vth1 while regenerative electric energy is fed back to the medium-voltage ring network within the capacity Pinv of the inversion feedback device;
when the energy storage device enters an energy absorption state, the energy storage device adopts a control strategy of a voltage outer ring and a current inner ring, and in the power Psto of the energy storage device, regenerative electric energy is fed back and absorbed into an energy storage medium, and meanwhile, the voltage of a direct current traction network is stabilized to be Vth 2;
step seven: the main controller samples the voltage of the direct current traction network when the inversion feedback device and the energy storage device are both put into absorbing energy, and if the voltage of the direct current traction network at the moment becomes smaller and the current of the energy storage device is reduced to zero, the energy storage device quits absorbing energy; after the energy storage device is judged to be withdrawn from absorbing energy by the main controller, whether the voltage of the direct current traction network is stable and whether the absorption current of the inversion feedback device is zero or not is judged by the main controller; if the absorption current of the inversion feedback device is zero at the moment, the regenerative braking power is reduced to zero, the inversion feedback device quits absorbing energy, namely the hybrid regenerative electric energy absorption and utilization device quits the regenerative electric energy absorption process;
step eight: if the voltage of the direct current traction network is smaller than a third voltage preset value Vth3, wherein Vth3 is smaller than Vth1, the main controller sends an energy release signal to the energy storage device, and the energy storage device releases the stored energy to the direct current traction network.
2. The capacity allocation and control method of a hybrid regenerative electric energy absorption and utilization device according to claim 1, wherein: and when the energy storage device is in an energy release state, after all the electric energy is released, the energy storage device quits to operate and waits for the next regenerative energy absorption process.
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| CN109802393B (en) * | 2019-03-25 | 2020-08-11 | 西安开天铁路电气股份有限公司 | Railway regenerative electric energy flow control algorithm |
| CN110138003B (en) * | 2019-04-19 | 2023-09-12 | 西安开天铁路电气股份有限公司 | Dynamic automatic networking method for railway traction power grid |
| CN111509697A (en) * | 2020-05-07 | 2020-08-07 | 北京泓慧国际能源技术发展有限公司 | Subway regenerative braking energy recovery control system and method based on flywheel energy storage array |
| CN114228765B (en) * | 2021-12-21 | 2023-05-05 | 西南交通大学 | Vehicle-mounted energy storage equipment configuration method based on schedule adjustment |
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