CN114172181B - Impact power and pulse power rapid stabilization method based on two-stage hybrid energy storage - Google Patents
Impact power and pulse power rapid stabilization method based on two-stage hybrid energy storage Download PDFInfo
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Classifications
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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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- 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
- H02J3/24—Arrangements for preventing or reducing oscillations of power in networks
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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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- 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
- H02J3/46—Controlling of the sharing of output between the generators, converters, or transformers
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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
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/34—Parallel operation in networks using both storage and other dc sources, e.g. providing buffering
- H02J7/345—Parallel operation in networks using both storage and other dc sources, e.g. providing buffering using capacitors as storage or buffering devices
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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
- H02J2207/00—Indexing scheme relating to details of circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J2207/50—Charging of capacitors, supercapacitors, ultra-capacitors or double layer capacitors
Abstract
The invention relates to a method for quickly stabilizing impact power and pulse power based on two-stage hybrid energy storage, which is used for sampling the output current of an energy storage converter; sampling the voltage of a direct current bus; sampling the voltage and the output current of two ends of the storage battery; sampling the voltages at two ends of the super capacitor and outputting current; sampling the output voltage and current of the load side, and calculating to obtain the output power of the load side; performing dq conversion on the output current of the inverter; designing a control loop of the voltage of a direct-current bus of the energy storage converter, and establishing voltage-current double closed-loop control by means of an inverter; designing a distribution mode of output power of the storage battery and the super capacitor; separating the total power output from the energy storage side by using a low-pass filter; designing a DC/DC converter control loop of the energy storage converter; the energy storage converter adopting the control strategy is connected in parallel to the power distribution network, so that the impact power and the pulse power can be quickly stabilized. The method is favorable for reasonably and efficiently realizing the rapid stabilization of the impact power and the pulse power.
Description
Technical Field
The invention belongs to the technical field of power distribution network control, and particularly relates to a method for quickly stabilizing impact power and pulse power based on two-stage hybrid energy storage.
Background
With the continuous development of modern society, the load forms of users are more and more diversified, the problems of impact power and pulse power of a power grid are more and more remarkable, and the service life of a power transmission line is reduced due to the fact that the impact power or the pulse power occurs in the distribution network for a long time.
Disclosure of Invention
The invention aims to provide a method for quickly stabilizing impact power and pulse power based on two-stage hybrid energy storage, which is favorable for reasonably and efficiently realizing the quick stabilization of the impact power and the pulse power.
In order to achieve the above purpose, the invention adopts the following technical scheme: a method for quickly stabilizing impact power and pulse power based on two-stage hybrid energy storage comprises the following steps:
step 1, sampling output current i of an energy storage converter c ；
Step 2, measuring a power supply voltage phase omega t of the power distribution network by using a phase-locked loop;
step 3, sampling the DC bus voltage u d ；
Step 4, sampling the voltage u at two ends of the storage battery bat Output current i bat ；
Step 5, sampling the voltage u at two ends of the super capacitor sc Output current i sc ；
Step 6, sampling the output voltage u of the load side o Current i o Calculating to obtain output power P of load side o ；
Step 7, taking ωt as a reference phase to output current i to the inverter c Performing dq transformation to obtain d-axis component i c_d And q-axis component i c_q ；
Step 8, designing a control loop of the voltage of the direct-current bus of the energy storage converter, and establishing voltage-current double closed-loop control by means of an inverter, wherein the d-axis voltage reference valueThe feedback value is u, which is the direct current bus voltage command value d The current feedback value is i c_d The method comprises the steps of carrying out a first treatment on the surface of the The q-axis is current single closed loop control, the current reference value is 0, and the current feedback value is i c_q ；
Step 9, designing a distribution mode of output power of the storage battery and the super capacitor; the energy storage side outputs the total power P sto By the load powerP o Rated power P of electric network g Subtracting and determining;
step 10, using a low pass filter pair P sto Separating to obtain low frequency power P low And high frequency power P high ；
Step 11, designing a DC/DC converter control loop of the energy storage converter; the storage battery DC/DC converter and the super capacitor DC/DC converter are controlled by adopting a current single closed loop; current reference value of storage battery DC/DC converterFrom P low And u is equal to bat The ratio is obtained, the feedback value is i bat The method comprises the steps of carrying out a first treatment on the surface of the Super capacitor DC/DC converter current reference value +.>From P high And u is equal to sc The ratio is obtained, the feedback value is i sc ；
And step 12, connecting an energy storage converter adopting the control strategy in parallel on a power distribution network, so that the rapid stabilization of impact power and pulse power can be realized.
Further, the sampled current i c As a feedback value of the current loop of the energy storage converter, the sampled voltage u d As a feedback value for the voltage loop of the energy storage converter.
Further, the sampled voltage u bat For calculating a given value of a current loop of a DC/DC converter of a battery, a sampled current i bat As a feedback value of the battery DC/DC converter current loop, PI control is used to make the battery output the same power as required.
Further, the sampled voltage u sc For calculating the given value of the current loop of the super capacitor DC/DC converter, and the sampled current i sc And as a feedback value of the current loop of the DC/DC converter of the super capacitor, the PI control is utilized to enable the super capacitor to output the same power as required.
Further, d-axis voltage reference valueThe direct current bus voltage command value is set according to the actual voltage level.
Further, the rated power P of the power grid g Is determined by the actual application requirements.
Furthermore, the method uses two-stage type and hybrid energy storage, and combines the control of an energy storage converter to realize the rapid stabilization of impact power and pulse power.
Compared with the prior art, the invention has the following beneficial effects: aiming at the problems of impact power and pulse power caused by diversification of user load forms, the method for quickly stabilizing the impact power and the pulse power based on the two-stage hybrid energy storage is provided, the advantages of the hybrid energy storage are effectively exerted, namely, the high energy density of the storage battery and the high power density of the super capacitor are utilized, and the quick stabilization of the impact power and the pulse power is reasonably and efficiently realized. Meanwhile, based on a two-stage topological structure, the inverter is utilized to stabilize the voltage of the direct current bus, so that the control problem caused by the voltage reduction of the discharge rear end of the super capacitor is solved, the voltage input range of the direct current side is widened, the number of control loops of the energy storage side is reduced, the feedback control rate is improved, and the rapid stabilization of the impact power and the pulse power is further realized.
Drawings
Fig. 1 is a topological structure diagram of a two-stage hybrid energy storage converter hanging on a distribution network in an embodiment of the invention;
FIG. 2 is a control block diagram of an inverter according to an embodiment of the present invention;
FIG. 3 is a block diagram of a hybrid stored energy power distribution in an embodiment of the present invention;
FIG. 4 is a control block diagram of a battery DC/DC converter in an embodiment of the invention;
FIG. 5 is a control block diagram of a supercapacitor DC/DC converter according to an embodiment of the present invention;
FIG. 6 is a simulation result of the output power of the power distribution network when the energy storage converter is not present and the load generates pulse power in the embodiment of the present invention;
FIG. 7 is a simulation result of output power of a power distribution network with an energy storage converter and a load generating pulse power according to an embodiment of the present invention;
FIG. 8 is a simulation result of output power of a power distribution network after impact load input without an energy storage converter in an embodiment of the present invention;
FIG. 9 is a graph showing the simulation results of the output power of the super capacitor and the storage battery after the impact load is put into operation in the embodiment of the invention;
fig. 10 is a simulation result of output power of the power distribution network after impact load input when the energy storage converter is provided in the embodiment of the invention.
Detailed Description
The invention will be further described with reference to the accompanying drawings and examples.
It should be noted that the following detailed description is exemplary and is intended to provide further explanation of the present application. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments in accordance with the present application. As used herein, the singular is also intended to include the plural unless the context clearly indicates otherwise, and furthermore, it is to be understood that the terms "comprises" and/or "comprising" when used in this specification are taken to specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof.
Aiming at the problems of impact power and pulse power caused by the diversification of the user load form, the invention provides a topological structure and a control strategy, which can quickly and effectively stabilize the impact power and the pulse power caused by the load, and has higher practical value and economic benefit.
Before describing the specific implementation steps, the variables used in this embodiment are described as follows:
(1)P o load power in a distribution network
(2)P g Rated power output by distribution network
(3)P sto The total power required to be output by the energy storage side
(4)P low Low frequency power to be output at energy storage side
(5)P high High frequency power to be output from energy storage side
(6)u d Voltage of DC bus
(7)u bat Voltage across the battery
(8)u sc Voltage across super capacitor
(9)i c : output current of energy storage converter after passing through filter circuit
(10)i bat Output current of accumulator
(11)i sc Output current of super capacitor
(12)i c_d : the inverter output current is transformed to the d-axis component in the dq coordinate system (rotated at angular frequency ω)
(13)i c_q : the inverter output current is transformed to the q-axis component in the dq coordinate system (rotated at angular frequency ω)
As shown in fig. 1, the impact power and pulse power rapid stabilization method based on the two-stage hybrid energy storage converter is provided, and the method aims at the overall structure of a system, as shown in fig. 1, power is transmitted to a load by a power distribution network, and the two-stage hybrid energy storage converter runs on a grid, so that the impact power and pulse power requirements of the load side are met. When the load power is suddenly changed, the impact power is detected and distributed by the method, and the impact power and the pulse power can be quickly stabilized finally by controlling the two-stage hybrid energy storage converter, so that the power sudden change of the power distribution network is prevented. The method utilizes the two-stage hybrid energy storage converter hung in the power distribution network to realize the effect of quickly stabilizing the impact power and the pulse power, and comprises the following specific implementation steps:
step 1, sampling output current i of an energy storage converter c As shown in fig. 1, this is used as a feedback value for the current loop of the energy storage converter.
And 2, measuring the power supply voltage phase omega t of the power distribution network by using a phase-locked loop, and preparing for subsequent coordinate transformation operation.
Step 3, sampling the DC bus voltage u d Will beWhich is used as a feedback value for the voltage loop of the energy storage converter.
Step 4, sampling the voltage u at two ends of the storage battery bat Output current i bat Wherein u is bat The method comprises the steps of calculating a given value of a current loop of a DC/DC converter of a storage battery; i.e bat As a feedback value of the battery DC/DC converter current loop, PI control is used to make the battery output the same power as required.
Step 5, similar to step 4, sampling the voltage u at two ends of the super capacitor bat Output current i bat Wherein u is sc The method is used for calculating the given value of the current loop of the DC/DC converter of the super capacitor; i.e sc And as a feedback value of the current loop of the DC/DC converter of the super capacitor, the PI control is utilized to enable the super capacitor to output the same power as required.
Step 6, sampling the output voltage u of the load side o And current i o Calculating the output power P of the load test o Prepare for the power allocation at a later time.
Step 7, taking ωt as a reference phase to output current i to the inverter c Performing dq transformation to obtain d-axis component i c_d And q-axis component i c_q 。
Step 8, designing a control loop of the voltage of the direct-current bus of the energy storage converter, and establishing voltage-current double closed-loop control by means of an inverter, wherein the d-axis voltage reference value is shown in fig. 2Is a direct current bus voltage command value, and is set according to the actual voltage class, and the feedback value is u d The current feedback value is i c_d The method comprises the steps of carrying out a first treatment on the surface of the The q-axis is current single closed loop control, the current reference value is 0, and the current feedback value is i c_q 。
And 9, designing a distribution mode of output power of the storage battery and the super capacitor. The energy storage side outputs the total power P sto By the load power P o Rated power P of electric network g Subtraction determination, wherein the power grid rated power P g Is determined by the actual application requirements.
Step 10, using a low pass filter pair P sto Performing separationAs shown in FIG. 3, a low frequency power P is obtained low And high frequency power P high 。
And 11, designing a DC/DC converter control loop of the energy storage converter, wherein the storage battery DC/DC converter and the super capacitor DC/DC converter are controlled by adopting a current single closed loop. As shown in fig. 4, the battery DC/DC converter current reference valueFrom P low And u is equal to bat The ratio is obtained, the feedback value is i bat The method comprises the steps of carrying out a first treatment on the surface of the As shown in FIG. 5, the reference value of the super capacitor DC/DC converter current is +.>From P low And u is equal to bat The ratio is obtained, the feedback value is i sc 。
And step 12, connecting an energy storage converter adopting the control strategy in parallel on a power distribution network, so that the rapid stabilization of impact power and pulse power can be realized.
The simulation results of fig. 6 to 10 verify the accuracy and reliability of the method of the present invention. As shown in fig. 6, when the load power exhibits pulse fluctuation in the case where the power distribution network is not tied to a two-stage hybrid energy storage converter, the power distribution network output power is pulsed. As shown in fig. 7, in the case of the power distribution network being hung by the two-stage hybrid energy storage converter, by rapidly controlling the two-stage hybrid energy storage, when the load power fluctuates in a pulse, the output power of the power grid is not pulsed, and the pulse power is suppressed. As shown in fig. 8, in the case that the power distribution network is not hung by the two-stage hybrid energy storage converter, after the load generates impact power, the output power of the power grid also generates corresponding impact. As shown in fig. 9, when the power distribution network is hung on the two-stage hybrid energy storage converter and the load generates impact power, the super capacitor outputs corresponding high-frequency power and the energy storage battery outputs corresponding low-frequency power. As shown in fig. 10, in the case where the power distribution network is hung by the two-stage hybrid energy storage converter, the power impact power of the power grid is suppressed by the rapid control of the two-stage hybrid energy storage. The simulation result verifies the effectiveness and practicability of the impact power and pulse power rapid stabilization method based on the two-stage hybrid energy storage converter.
The method according to the invention is further described below.
The method aims at a three-phase power distribution network, detects and distributes impact power and pulse power generated by a load, and finally realizes the rapid stabilization of the impact power and the pulse power by controlling the two-stage hybrid energy storage converter so as to prevent the power mutation of the power distribution network.
Because the super capacitor has the problem that the voltage at the discharge rear end is reduced along with the reduction of the residual capacity, when the traditional single-stage topology is adopted, the direct-current side voltage input range is limited, and the method adopts a two-stage topology structure, as shown in figure 1, the storage battery and the super capacitor are connected to a direct-current bus through a bidirectional DC/DC converter, and then the direct-current bus is connected with an NPC three-level inverter. By using the two-stage topological structure, the voltage of the direct current side is changed from the voltage of the end of the changed super capacitor to the stable and controllable direct current bus voltage, and the voltage input range of the direct current side is widened.
As shown in fig. 1, since the real-time active power of the load cannot be obtained directly by sampling, the load current i needs to be sampled from the load end in real time o Load voltage u o The active power is further obtained. Because the PI controller has poor ac quantity control effect, it is necessary to process the three-phase ac quantity, thereby converting the three-phase ac quantity into two-phase dc quantity. The processing mode adopts dq conversion, so that the phase-locked loop is also required to be used for measuring the phase omega t of the power voltage of the power distribution network.
After obtaining the sample size required for detection, the dq conversion is used to convert the load current i o And load voltage u o Transformed onto the dq coordinate system. Taking current as an example, the conversion formula is as follows:
the load current obtained by sampling is calculated by the formulai o Load voltage u o Conversion to two-phase direct current i od ，i oq ，u od ，u oq . At this time, the load active power P at this time can be obtained by using the power o The calculation formula is as follows:
in step 8, in the control mode of the dc bus voltage, the method selects to stabilize the dc bus voltage by using the NPC three-level inverter, as shown in fig. 2, the inverter output current i is obtained by sampling c Dq decomposition is carried out to obtain d-axis component i c_d And q-axis component i c_q Establishing voltage-current double closed-loop control by means of an inverter, d-axis voltage reference valueIs a direct current bus voltage command value, and is set according to the actual voltage class, and the feedback value is u d The current feedback value is i c_d The method comprises the steps of carrying out a first treatment on the surface of the The q-axis is current single closed loop control, the current reference value is 0, and the current feedback value is i c_q 。
Compared with the method for stabilizing the direct current bus voltage by using the energy storage side bidirectional DC/DC converter, the method reduces the control loop number of the energy storage side, ensures that the bidirectional DC/DC converter has only one current loop control, improves the speed of feedback control, realizes the rapidity of specified power output, and further better realizes the rapid stabilization of the impact power and the pulse power by the energy storage converter.
Obtaining real-time load active power P o Then, the rated output power P of the power distribution network is matched g The output power instruction value P of the energy storage converter can be obtained after subtraction sto 。
In order to realize the rapidity of stabilizing the impact power and the pulse power, the method adopts an energy storage mode of hybrid energy storage, and compared with the traditional storage battery energy storage, the method increases the powerThe super capacitor of the energy storage element can output instantaneous high power, overcomes the defect of low power density of the storage battery, and meanwhile, the storage battery is used as the energy storage element, can maintain long-time high power output, and overcomes the defect of low energy density of the super capacitor. As shown in fig. 3, the output power command value P of the energy storage converter sto Decomposing by a low-pass filter to obtain low-frequency power P low And high frequency power P high . As shown in fig. 4 and 5, the characteristics of the hybrid energy storage are utilized, high-frequency power is distributed to the super capacitor with high power density and low energy storage density, low-frequency power is distributed to the storage battery with high energy storage density and low power density, and the specified power output of the storage battery and the super capacitor is realized through PI control.
In summary, under the topological structure and the control strategy, after the impact power brought by the load is filtered and separated, the hybrid energy storage equipment is adopted to respectively output corresponding power, so that the advantages of hybrid energy storage are effectively exerted, and the high energy density of the storage battery and the high power density of the super capacitor are utilized to reasonably and efficiently realize the rapid stabilization of the impact power and the pulse power. Meanwhile, based on a two-stage topological structure, the inverter is utilized to stabilize the voltage of the direct current bus, so that the control problem caused by the voltage reduction of the discharge rear end of the super capacitor is solved, the voltage input range of the direct current side is widened, the number of control loops of the energy storage side is reduced, the feedback control rate is improved, and the rapid stabilization of the impact power and the pulse power is further realized. Under the method, the two-stage hybrid energy storage converter can be utilized to realize the rapid stabilization of the impact power and the pulse power of the power distribution network with high utilization rate. The method is practical and feasible, has stronger engineering application value and can generate better economic benefit.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the invention in any way, and any person skilled in the art may make modifications or alterations to the disclosed technical content to the equivalent embodiments. However, any simple modification, equivalent variation and variation of the above embodiments according to the technical substance of the present invention still fall within the protection scope of the technical solution of the present invention.
Claims (7)
1. The impact power and pulse power rapid stabilization method based on the two-stage hybrid energy storage is characterized by comprising the following steps of:
step 1, sampling output current i of an energy storage converter c ；
Step 2, measuring a power supply voltage phase omega t of the power distribution network by using a phase-locked loop;
step 3, sampling the DC bus voltage u d ；
Step 4, sampling the voltage u at two ends of the storage battery bat Output current i bat ；
Step 5, sampling the voltage u at two ends of the super capacitor sc Output current i sc ；
Step 6, sampling the output voltage u of the load side o Current i o Calculating to obtain output power P of load side o ；
Step 7, taking ωt as a reference phase to output current i to the inverter c Performing dq transformation to obtain d-axis component i c_d And q-axis component i c_q ；
Step 8, designing a control loop of the voltage of the direct-current bus of the energy storage converter, and establishing voltage-current double closed-loop control by means of an inverter, wherein the d-axis voltage reference valueThe feedback value is the sampled DC bus voltage u d The current feedback value is i c_d The method comprises the steps of carrying out a first treatment on the surface of the The q-axis is current single closed loop control, the current reference value is 0, and the current feedback value is i c_q ；
Step 9, designing a distribution mode of output power of the storage battery and the super capacitor; the energy storage side outputs the total power P sto By the load power P o Rated power P of electric network g Subtracting and determining;
step 10, using a low pass filter pair P sto Separating to obtain low frequency power P low And high frequency powerP high ；
Step 11, designing a DC/DC converter control loop of the energy storage converter; the storage battery DC/DC converter and the super capacitor DC/DC converter are controlled by adopting a current single closed loop; current reference value of storage battery DC/DC converterFrom P low And u is equal to bat The ratio is obtained, the feedback value is i bat The method comprises the steps of carrying out a first treatment on the surface of the Super capacitor DC/DC converter current reference value +.>From P high And u is equal to sc The ratio is obtained, the feedback value is i sc ；
And step 12, connecting an energy storage converter adopting the control strategy in parallel on a power distribution network, so that the rapid stabilization of impact power and pulse power can be realized.
2. The method for rapid settling of percussion power and pulse power based on two-stage hybrid energy storage according to claim 1, characterized in that the sampled current i c As feedback value of the current loop of the energy storage converter, the sampled voltage u d As a feedback value for the voltage loop of the energy storage converter.
3. The method for rapid settling of percussion power and pulse power based on two-stage hybrid energy storage according to claim 1, characterized in that the sampled voltage u bat For calculating a given value of a current loop of a DC/DC converter of a battery, a sampled current i bat As a feedback value of the battery DC/DC converter current loop, PI control is used to make the battery output the same power as required.
4. The method for rapid settling of percussion power and pulse power based on two-stage hybrid energy storage according to claim 1, characterized in that the sampled voltage u sc For calculating the given value of the current loop of the super capacitor DC/DC converter, and the sampled current i sc As a means ofAnd the feedback value of the current loop of the DC/DC converter of the super capacitor is controlled by PI so that the super capacitor outputs the same power as the required power.
5. The method for rapid stabilization of percussion power and pulse power based on two-stage hybrid energy storage according to claim 1, characterized in that the d-axis voltage reference u d * The direct current bus voltage command value is set according to the actual voltage level.
6. The method for quickly stabilizing impact power and pulse power based on two-stage hybrid energy storage according to claim 1, wherein the rated power P of the power grid g Is determined by the actual application requirements.
7. The method for quickly stabilizing the impact power and the pulse power based on the two-stage hybrid energy storage according to claim 1, wherein the two-stage hybrid energy storage is used, and the control of the energy storage converter is combined to realize the quick stabilization of the impact power and the pulse power.
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