CN109103911A - Middle straightening stream energy storage device and energy management method based on electric power electric transformer - Google Patents
Middle straightening stream energy storage device and energy management method based on electric power electric transformer Download PDFInfo
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- CN109103911A CN109103911A CN201710474980.2A CN201710474980A CN109103911A CN 109103911 A CN109103911 A CN 109103911A CN 201710474980 A CN201710474980 A CN 201710474980A CN 109103911 A CN109103911 A CN 109103911A
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- 238000004146 energy storage Methods 0.000 title claims abstract description 97
- 238000007726 management method Methods 0.000 title claims abstract description 16
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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
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
- H02M7/44—Conversion of dc power input into ac power output without possibility of reversal by static converters
- H02M7/48—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M7/483—Converters with outputs that each can have more than two voltages levels
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
- H02M7/44—Conversion of dc power input into ac power output without possibility of reversal by static converters
- H02M7/48—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M7/483—Converters with outputs that each can have more than two voltages levels
- H02M7/4835—Converters with outputs that each can have more than two voltages levels comprising two or more cells, each including a switchable capacitor, the capacitors having a nominal charge voltage which corresponds to a given fraction of the input voltage, and the capacitors being selectively connected in series to determine the instantaneous output voltage
Abstract
The invention discloses a kind of middle straightening stream energy storage device and energy management method based on electric power electric transformer, the device includes: first power converting circuit in parallel with middle pressure DC bus, the second source translation circuit being connect with the first power converting circuit by intermediate frequency or high frequency transformer；Wherein, the DC side of each submodule configures power-type energy-storage travelling wave tube in the first power converting circuit, the DC side configuration energy type energy-storage travelling wave tube of each submodule in second source translation circuit；Electrical isolation and energy transmission can be carried out by intermediate frequency or high frequency transformer through the invention；By power-type energy-storage travelling wave tube, can compensate in press DC bus harmonic current, short circuit current can also be limited, and cooperate dc circuit breaker that can carry out short-circuit protection, improve system low-voltage fault ride-through capacity, power supply quality and stability；By energy type energy-storage travelling wave tube, the power for providing emergency is supported, ensure that the continuity of system power supply.
Description
Technical field
The present invention relates to power electronics field, in particular to a kind of middle straightening stream storage based on electric power electric transformer
It can device and energy management method.
Background technique
Currently, existing middle straightening stream (MVDC, Medium Voltage Direct Current) system is in steady-state operation
When, the intrinsic negative resistance character of constant power load will will lead to its output impedance and change.When output impedance and supply network
It can cause system voltage and current oscillation when impedance mismatching, deteriorate power supply quality.In addition, heavy-duty motor starting, pulse load
The operating conditions such as operation, transformer saturation, short trouble all may cause the Voltage Drop of middle pressure DC bus, influence power load just
Often operation.Therefore, in how solving straightening streaming system to pulse feature load supplying supportability, critical loads power supply continuity,
System short trouble passes through the problem of with the oscillation of middle pressure DC bus current, is urgent problem now.
Summary of the invention
The middle straightening stream energy storage device and energy management that the object of the present invention is to provide a kind of based on electric power electric transformer
Method, using energy type energy-storage travelling wave tube, is provided urgent with the impact using the smooth pulse load of power-type energy-storage travelling wave tube to power grid
The power of situation is supported, guarantees the continuity of system power supply.
In order to solve the above technical problems, the present invention provides a kind of middle pressure DC energy storage dress based on electric power electric transformer
Set, comprising: with middle pressure DC bus the first power converting circuit in parallel, with first power converting circuit pass through intermediate frequency or
The second source translation circuit of high frequency transformer connection；
Wherein, the DC side of each submodule configures power-type energy-storage travelling wave tube in first power converting circuit, described
The DC side configuration energy type energy-storage travelling wave tube of each submodule in second source translation circuit.
Optionally, first power converting circuit is specially single-phase MMC topological structure.
Optionally, each submodule is specially full bridge structure in first power converting circuit.
Optionally, the second source translation circuit is specially high-frequency inverter crisscross parallel topological structure.
Optionally, each submodule is specially full bridge structure in the second source translation circuit.
Optionally, the intermediate frequency or high frequency transformer are specially single transformer alone.
Optionally, the power-type energy-storage travelling wave tube is specially super capacitor, and the energy type energy-storage travelling wave tube is specially electric power storage
Pond.
In addition, the present invention also provides a kind of middle straightening stream energy management method based on electric power electric transformer, is based on
Middle straightening stream energy storage device as described in any one of the above embodiments based on electric power electric transformer, medium pressure DC energy manager
Method, comprising:
According to the energy management control unit of acquisition send medium pressure DC energy storage device required watt current and
Middle pressure DC bus current measured value calculates the duty ratio common mode component for obtaining first power converting circuit；
According to the total voltage given value of the power-type energy-storage travelling wave tube of the first power converting circuit whole submodule and institute
The total voltage measured value of the power-type energy-storage travelling wave tube of the first power converting circuit whole submodule is stated, calculates and obtains first electricity
The duty ratio differential-mode component of source translation circuit；
According to the duty ratio common mode component, the duty ratio differential-mode component, first power converting circuit of acquisition
The storage of the power-type of the measured value of the power-type energy-storage travelling wave tube of each submodule and each submodule of the first power converting circuit
The current direction of the energy corresponding voltage given value of element and each submodule of the first power converting circuit calculates and obtains institute
State the duty ratio of each submodule of the first power converting circuit；
According to the state-of-charge given value of the energy type energy-storage travelling wave tube of the second source translation circuit of acquisition and described second
It is each to calculate the acquisition second source translation circuit for the state-of-charge measured value of the energy type energy-storage travelling wave tube of power converting circuit
The duty ratio of submodule.
Optionally, needed for the medium pressure DC energy storage device sent according to the energy management control unit of acquisition
Watt current and middle pressure DC bus current measured value calculate the duty ratio common mode point for obtaining first power converting circuit
Amount, further includes:
Using the given value of current value of failure current limit unit control medium pressure DC bus, fault current is controlled to pre-
If numerical value.
Optionally, described according to the duty ratio common mode component of acquisition, the duty ratio differential-mode component, first electricity
The measured value of the power-type energy-storage travelling wave tube of each submodule of source translation circuit and each submodule of the first power converting circuit
The corresponding voltage given value of power-type energy-storage travelling wave tube and each submodule of the first power converting circuit current direction,
Calculate the duty ratio for obtaining each submodule of the first power converting circuit, comprising:
The measured value of the power-type energy-storage travelling wave tube for each submodule of the first power converting circuit that will acquire and described
The corresponding voltage given value superposition of the power-type energy-storage travelling wave tube of each submodule of first power converting circuit is input to proportional integration
Controller obtains the first data of the pi controller output；
The current direction of first data and each submodule of the first power converting circuit is input to multiplier,
Obtain the second data of the multiplier output；
The duty ratio common mode component and the duty ratio differential-mode component of second data and acquisition is superimposed, it obtains
Take the duty ratio of each submodule of the first power converting circuit.
A kind of middle straightening stream energy storage device based on electric power electric transformer provided by the present invention, comprising: with middle straightening
The first power converting circuit for flowing bus parallel connection, is connect with first power converting circuit by intermediate frequency or high frequency transformer
Second source translation circuit；Wherein, the DC side of each submodule configures power-type energy storage in first power converting circuit
Element, the DC side configuration energy type energy-storage travelling wave tube of each submodule in the second source translation circuit；
As it can be seen that passing through the second source translation circuit of on high-tension side first power converting circuit and low-pressure side through the invention
Between intermediate frequency or high frequency transformer, electrical isolation and energy transmission can be carried out；By each in the first power converting circuit
Submodule DC side configuration power-type energy-storage travelling wave tube, can compensate in press DC bus harmonic current, can also be to short
Road electric current is limited, and cooperates dc circuit breaker that can carry out short-circuit protection, to improve system low-voltage fault traversing
Ability, power supply quality and stability；Pass through the energy type storage of the DC side configuration of each submodule in second source translation circuit
Energy element, the power that can provide emergency is supported, guarantees the continuity of system power supply, even if in case of a fault, also can
The electricity consumption of straightening streaming system critical loads in guarantee.In addition, the present invention also provides a kind of based in electric power electric transformer
Straightening stream energy management method equally has above-mentioned beneficial effect.
Detailed description of the invention
In order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, to embodiment or will show below
There is attached drawing needed in technical description to be briefly described, it should be apparent that, the accompanying drawings in the following description is only this
The embodiment of invention for those of ordinary skill in the art without creative efforts, can also basis
The attached drawing of offer obtains other attached drawings.
Fig. 1 is a kind of knot of the middle straightening stream energy storage device based on electric power electric transformer provided by the embodiment of the present invention
Composition；
Fig. 2 is a kind of reality of the middle straightening stream energy storage device based on electric power electric transformer provided by the embodiment of the present invention
Example diagram；
Fig. 3 is a kind of middle straightening stream energy management method based on electric power electric transformer provided by the embodiment of the present invention
Flow chart；
Fig. 4 is a kind of middle straightening stream energy management method based on electric power electric transformer provided by the embodiment of the present invention
A kind of energy hole block diagram；
Fig. 5 is a kind of middle straightening stream energy management method based on electric power electric transformer provided by the embodiment of the present invention
Another energy hole block diagram；
Fig. 6 is a kind of middle straightening stream energy management method based on electric power electric transformer provided by the embodiment of the present invention
Another energy hole block diagram；
Fig. 7 is a kind of middle straightening stream energy management method based on electric power electric transformer provided by the embodiment of the present invention
Another energy hole block diagram.
Specific embodiment
In order to make the object, technical scheme and advantages of the embodiment of the invention clearer, below in conjunction with the embodiment of the present invention
In attached drawing, technical scheme in the embodiment of the invention is clearly and completely described, it is clear that described embodiment is
A part of the embodiment of the present invention, instead of all the embodiments.Based on the embodiments of the present invention, those of ordinary skill in the art
Every other embodiment obtained without making creative work, shall fall within the protection scope of the present invention.
Referring to FIG. 1, Fig. 1 is a kind of middle straightening stream storage based on electric power electric transformer provided by the embodiment of the present invention
The structure chart of energy device.The apparatus may include: first power converting circuit 100 in parallel with middle pressure DC bus, with first
The second source translation circuit 300 that power converting circuit 100 is connected by intermediate frequency or high frequency transformer 200.
Wherein, the DC side of each submodule 110 configures power-type energy-storage travelling wave tube 111 in the first power converting circuit 100,
The DC side configuration energy type energy-storage travelling wave tube 311 of each submodule 310 in second source translation circuit 300.
It is understood that the first power converting circuit 100 of device mesohigh side provided by the present embodiment can be
MMC (module multi-level converter) topological structure, or CHB (cascade converter) topological structure, as long as in the first power supply
The DC side of each submodule 110 can configure power-type energy-storage travelling wave tube 111 in translation circuit 100, for the first power conversion
The specific structure of circuit 100, the present embodiment do not do any restrictions.The second source of device mesolow side provided by the present embodiment
Translation circuit 300 can be high-frequency inverter crisscross parallel topological structure, or MMC topological structure can also be CHB
(cascade converter) topological structure, as long as the DC side of each submodule 310 can configure in second source translation circuit 300
Energy type energy-storage travelling wave tube 311, for the specific structure of second source translation circuit 300, the present embodiment does not do any restrictions.
Likewise, in each submodule 110 and second source translation circuit 300 in the first power converting circuit 100
The specific structure of each submodule 310 can be full bridge structure, or half-bridge structure can also be more level blocks, this
Embodiment is unrestricted to this.
It should be noted that device provided by the present embodiment can be monophase system, or three-phase or heterogeneous system
System.Can be by actual person according to practical scene and user demand self-setting, the present embodiment does not do any restrictions to this.It is corresponding
, intermediate frequency or high frequency transformer 200 in device provided by the present embodiment can be single or multiple independent transformers, also
It can be multiwinding transformer.The present embodiment does not do any restrictions equally to this.
Wherein, power-type energy-storage travelling wave tube 11 can be super capacitor, or such as other power-type energy storage members of flywheel
Part, the present embodiment do not do any restrictions to this.Energy type energy-storage travelling wave tube can be battery, or such as its of fuel cell
His energy-storage travelling wave tube, the present embodiment do not do any restrictions equally to this.
Specifically, device provided by the present embodiment can be as shown in Fig. 2, on high-tension side first power converting circuit 100
In parallel with middle pressure DC bus using single-phase MMC topological structure, each submodule 110 is full bridge structure, and its DC side configures
For the power-type energy-storage travelling wave tube 111 of super capacitor；The second source translation circuit 300 of low-pressure side is interlocked simultaneously using high-frequency inverter
Join topological structure, each submodule 310 is full bridge structure, and its DC side is configured to the energy type energy-storage travelling wave tube 311 of battery.
It is connected between first power converting circuit 100 and second source translation circuit 300 by the intermediate frequency of K:1 or high frequency transformer 200,
It can carry out electrical isolation and energy transmission.Wherein, L is high-pressure side branch reactor, and Ls is low-pressure side equalizing reactor.
As shown in Fig. 2, high-pressure side (the first power converting circuit 100) uses single-phase MMC topological structure.Wherein, every branch
Road includes positive and negative two bridge arms；Each bridge arm includes the first preset quantity full-bridge converter submodule (submodule 310).Each
Full-bridge converter submodule configures super capacitor (power-type energy-storage travelling wave tube 111), to buffer rushing for pulse feature power grid
It hits.On high-tension side MMC can be modulated using phase-shifting carrier wave；Low-pressure side (second source translation circuit 300) uses the second present count
Measure a high-frequency inverter crisscross parallel topological structure.Each submodule (submodule 310) configures battery (energy type energy-storage travelling wave tube
311), emergency power supply is provided, system failure ride-through capability is improved, guarantees system power supply duration.High-pressure side and low-pressure side
Electrical isolation, no-load voltage ratio K:1 are carried out by intermediate frequency or high flat transformer 200.
It is understood that device provided by the present embodiment is controllable to current source for middle straightening streaming system,
To middle pressure DC bus injecting compensating electric current, and then the function of APF (active power filtering) is played, improves system power supply quality.Simultaneously
As current source, when DC bus-bar voltage being pressed substantially to fall straightening stream busbar short-circuit in even in the middle, can still work, it such as can be with
The energy transmission that super capacitor stores is pressed into DC bus institute bringing onto load into low-pressure side battery or low pressure.
Specifically, as, since low-pressure side storage battery energy density is high, become by parallel connection converter in intermediate frequency or high frequency in Fig. 2
200 side of depressor generation sinusoidal voltage exchanges side voltage with MMC and shunt inductance, transformer leakage inductance interaction regulating cell fill
Discharge current carries out lasting energy snubber to whole system.Super capacitor power density is high, can charge and discharge in a short time
Electricity, the common mode current centering by controlling each branch of MMC press the ripple current of DC bus to compensate, realize APF function.Make
Obtaining whole device may be implemented the decoupling control of common mode and differential mode.High-pressure side MMC and the converter of low-pressure side crisscross parallel are also only
Vertical control.Common mode current by controlling each branch of MMC realizes flowing of the energy between battery and medium voltage DC net.Consider
Ripple current can cause the temperature rise of battery and then influence its service life, battery only provide constant DC common-mode electric current to
Middle pressure DC bus, and energy needed for the current ripples compensation in middle pressure DC bus can be undertaken by super capacitor.
In the present embodiment, second source that the embodiment of the present invention passes through on high-tension side first power converting circuit and low-pressure side
Intermediate frequency or high frequency transformer between translation circuit can carry out electrical isolation and energy transmission；Pass through the first power conversion electricity
In road each submodule DC side configuration power-type energy-storage travelling wave tube, can compensate in press DC bus harmonic current,
Short circuit current can be limited, and cooperate dc circuit breaker that can carry out short-circuit protection, to improve system low-voltage
Fault ride-through capacity, power supply quality and stability；Pass through the DC side configuration of each submodule in second source translation circuit
Energy type energy-storage travelling wave tube, the power that can provide emergency is supported, guarantees the continuity of system power supply, even if in fault condition
Under, it also can guarantee the electricity consumption of middle straightening streaming system critical loads.
Referring to FIG. 3, Fig. 3 is a kind of middle straightening stream energy based on electric power electric transformer provided by the embodiment of the present invention
The flow chart of quantity management method.Middle pressure DC energy storage dress provided by based on the above embodiment based on electric power electric transformer
It sets, this method may include:
Step 101: active electricity needed for the middle straightening stream energy storage device sent according to the energy management control unit of acquisition
Stream and middle pressure DC bus current measured value calculate the duty ratio common mode component for obtaining the first power converting circuit.
It is understood that the purpose of this step is the duty ratio common mode component in order to obtain the first power converting circuit,
For specific acquisition modes, can also can be obtained by other means, the present embodiment is to this in a manner of provided by this step
It is unrestricted.
Preferably, the given value of current of DC bus is pressed in can also controlling including the use of failure current limit unit in this step
Value, the step of by fault current control to default value so that method provided by the present embodiment have fault traversing and therefore
Fast restoration capabilities after barrier elimination.
Specifically, for the middle straightening stream energy storage device as shown in Figure 3 based on electric power electric transformer, this step can be with
Using the mode as provided by Fig. 4, the required active electricity for the middle straightening stream energy storage device that energy management control unit is sent is received
Stream, the DC component as MMC (the first power converting circuit) branch conveying electric current；Meanwhile by low-pass filter by middle pressure
DC bus current ripple is pressed in extracting after DC bus current measured value reverse phase, the line as MMC branch conveying common mode current
Wave component.The electric current that DC component and ripple component superposition are injected or compensated to middle straightening streaming system as entire energy device refers to
It enables.Failure current limit function (failure current limit unit) can be added in high-pressure side MMC control simultaneously, can control fault current control
Arbitrary value even zero is made, so that method provided by the embodiment of the present invention is with quick after fault traversing and Failure elimination
Recovery capability.
Step 102: according to the total voltage given value of the power-type energy-storage travelling wave tube of the first power converting circuit whole submodule
With the total voltage measured value of the power-type energy-storage travelling wave tube of the first power converting circuit whole submodule, calculates and obtain the change of the first power supply
Change the duty ratio differential-mode component of circuit.
It is understood that the purpose of this step is the duty ratio differential-mode component in order to obtain the first power converting circuit,
For specific acquisition modes, can also can be obtained by other means, the present embodiment is to this in a manner of provided by this step
It is unrestricted.
Specifically, for the middle straightening stream energy storage device as shown in Figure 3 based on electric power electric transformer, this step can be with
Using the mode as provided by Fig. 5, wherein V_ (cap_ref) is the instruction of high-pressure side MMC branch super capacitor total voltage, V_cap
The sum of its measured value.It, can be using classical d, q electric current since the MMC in middle straightening stream energy storage device is single-phase topological structure
Double -loop control.
Step 103: each according to the duty ratio common mode component, duty ratio differential-mode component, the first power converting circuit of acquisition
The measured value of the power-type energy-storage travelling wave tube of submodule and the power-type energy-storage travelling wave tube pair of each submodule of the first power converting circuit
The current direction of the voltage given value and each submodule of the first power converting circuit answered calculates and obtains the first power conversion electricity
The duty ratio of each submodule in road.
It is understood that the purpose of this step is the duty in order to obtain each submodule of the first power converting circuit
Than that can also can be obtained by other means, the present embodiment in a manner of provided by this step for specific acquisition modes
It is unrestricted to this.
It should be noted that for the middle straightening stream energy storage device as shown in Figure 3 based on electric power electric transformer, this step
Suddenly the mode as provided by Fig. 6 can be used, the duty ratio of the sub- converter unit of each bridge arm of high-pressure side MMC (submodule) is calculated.Often
A sub- converter unit duty ratio is made of bridge arm average duty ratio and its capacitor voltage balance regulated quantity two parts.Because passing through bridge
Arm electric current is balanced adjusting to respective sub- converter unit capacitance voltage, needs to consider bridge arm current when carrying out duty ratio calculating
Direction.Such as: the measured value and the first power supply of the power-type energy-storage travelling wave tube for each submodule of the first power converting circuit that will acquire
The corresponding voltage given value superposition of the power-type energy-storage travelling wave tube of each submodule of translation circuit is input to pi controller, obtains
The first data for taking pi controller to export；By the electric current side of the first data and each submodule of the first power converting circuit
To multiplier is input to, the second data of multiplier output are obtained；By the duty ratio common mode component of the second data and acquisition and account for
Sky is more superimposed than differential-mode component, obtains the duty ratio of each submodule of the first power converting circuit.
Step 104: according to the state-of-charge given value of the energy type energy-storage travelling wave tube of the second source translation circuit of acquisition and
It is each to calculate acquisition second source translation circuit for the state-of-charge measured value of the energy type energy-storage travelling wave tube of second source translation circuit
The duty ratio of submodule.
It is understood that the purpose of this step is the duty in order to obtain each submodule of second source translation circuit
Than that can also can be obtained by other means, the present embodiment in a manner of provided by this step for specific acquisition modes
It is unrestricted to this.
Specifically, for the middle straightening stream energy storage device as shown in Figure 3 based on electric power electric transformer, this step can be with
Using the mode as provided by Fig. 7, all batteries are realized by adjusting the duty ratio of converter (submodule) of crisscross parallel
SOC (state-of-charge) balance.
In the present embodiment, method provided by the embodiment of the present invention, in the pulse feature load running of middle straightening streaming system,
Allow power-type energy-storage travelling wave tube by middle straightening stream energy storage device quick response load power demand, reduces pulse feature load
The impact of centering straightening streaming system；In the middle when the high power load start and stop of straightening streaming system, quickly rung by power-type energy-storage travelling wave tube
The power demand for answering system constantly supplements energy to power-type energy-storage travelling wave tube from energy type energy-storage travelling wave tube, guarantees power supply
Duration；When the pulse feature load of straightening streaming system and bulk loads are not run in the middle, power-type energy-storage travelling wave tube and energy type storage
Can element can therefrom press DC bus to absorb energy, when the charging of energy type energy-storage travelling wave tube finishes and power-type energy-storage travelling wave tube electricity
After pressure reaches rated value, middle straightening stream energy storage device can be in hot standby state, no longer carry out energy friendship with middle straightening streaming system
It changes.Middle straightening streaming system impact resistance, power supply sustainability are improved, while the design maximum for reducing generating set is held
Amount.
Each embodiment is described in a progressive manner in specification, the highlights of each of the examples are with other realities
The difference of example is applied, the same or similar parts in each embodiment may refer to each other.For method disclosed in embodiment
Speech, since it is corresponding with device disclosed in embodiment, so being described relatively simple, related place is referring to method part illustration
?.
Professional further appreciates that, unit described in conjunction with the examples disclosed in the embodiments of the present disclosure
And algorithm steps, can be realized with electronic hardware, computer software, or a combination of the two, in order to clearly demonstrate hardware and
The interchangeability of software generally describes each exemplary composition and step according to function in the above description.These
Function is implemented in hardware or software actually, the specific application and design constraint depending on technical solution.Profession
Technical staff can use different methods to achieve the described function each specific application, but this realization is not answered
Think beyond the scope of this invention.
The step of method described in conjunction with the examples disclosed in this document or algorithm, can directly be held with hardware, processor
The combination of capable software module or the two is implemented.Software module can be placed in random access memory (RAM), memory, read-only deposit
Reservoir (ROM), electrically programmable ROM, electrically erasable ROM, register, hard disk, moveable magnetic disc, CD-ROM or technology
In any other form of storage medium well known in field.
Middle straightening stream energy storage device to provided by the present invention based on electric power electric transformer and energy management side above
Method is described in detail.Used herein a specific example illustrates the principle and implementation of the invention, above
The explanation of embodiment is merely used to help understand method and its core concept of the invention.It should be pointed out that for the art
Those of ordinary skill for, without departing from the principle of the present invention, can also to the present invention carry out it is several improvement and repair
Decorations, these improvements and modifications also fall within the scope of protection of the claims of the present invention.
Claims (10)
1. a kind of middle straightening stream energy storage device based on electric power electric transformer characterized by comprising with middle pressure DC bus
First power converting circuit in parallel, the second electricity being connect with first power converting circuit by intermediate frequency or high frequency transformer
Source translation circuit；
Wherein, in first power converting circuit each submodule DC side configure power-type energy-storage travelling wave tube, described second
The DC side configuration energy type energy-storage travelling wave tube of each submodule in power converting circuit.
2. the middle straightening stream energy storage device according to claim 1 based on electric power electric transformer, which is characterized in that described
First power converting circuit is specially single-phase MMC topological structure.
3. the middle straightening stream energy storage device according to claim 2 based on electric power electric transformer, which is characterized in that described
Each submodule is specially full bridge structure in first power converting circuit.
4. the middle straightening stream energy storage device according to claim 3 based on electric power electric transformer, which is characterized in that described
Second source translation circuit is specially high-frequency inverter crisscross parallel topological structure.
5. the middle straightening stream energy storage device according to claim 4 based on electric power electric transformer, which is characterized in that described
Each submodule is specially full bridge structure in second source translation circuit.
6. the middle straightening stream energy storage device according to claim 5 based on electric power electric transformer, which is characterized in that described
Intermediate frequency or high frequency transformer are specially single transformer alone.
7. the middle straightening stream energy storage device according to any one of claims 1 to 6 based on electric power electric transformer, feature
It is, the power-type energy-storage travelling wave tube is specially super capacitor, and the energy type energy-storage travelling wave tube is specially battery.
8. a kind of middle straightening stream energy management method based on electric power electric transformer, which is characterized in that based on such as claim 1
To 7 described in any item middle straightening stream energy storage devices based on electric power electric transformer, medium pressure DC energy management method,
Include:
According to the required watt current and middle pressure of the medium pressure DC energy storage device that the energy management control unit of acquisition is sent
DC bus current measured value calculates the duty ratio common mode component for obtaining first power converting circuit；
According to the total voltage given value of the power-type energy-storage travelling wave tube of the first power converting circuit whole submodule and described
The total voltage measured value of the power-type energy-storage travelling wave tube of one power converting circuit whole submodule calculates and obtains the first power supply change
Change the duty ratio differential-mode component of circuit；
It is each according to the duty ratio common mode component, the duty ratio differential-mode component, first power converting circuit of acquisition
The power-type energy storage member of the measured value of the power-type energy-storage travelling wave tube of submodule and each submodule of the first power converting circuit
The current direction of the corresponding voltage given value of part and each submodule of the first power converting circuit calculates and obtains described the
The duty ratio of each submodule of one power converting circuit；
According to the state-of-charge given value and the second source of the energy type energy-storage travelling wave tube of the second source translation circuit of acquisition
The state-of-charge measured value of the energy type energy-storage travelling wave tube of translation circuit calculates and obtains each submodule of second source translation circuit
The duty ratio of block.
9. the middle straightening stream energy management method according to claim 8 based on electric power electric transformer, which is characterized in that
The required watt current and middle pressure of the medium pressure DC energy storage device sent according to the energy management control unit of acquisition
DC bus current measured value calculates the duty ratio common mode component for obtaining first power converting circuit, further includes:
Using the given value of current value of failure current limit unit control medium pressure DC bus, by fault current control to present count
Value.
10. the middle straightening stream energy management method according to claim 9 based on electric power electric transformer, feature exist
In described every according to the duty ratio common mode component, the duty ratio differential-mode component, first power converting circuit of acquisition
The power-type energy storage of the measured value of the power-type energy-storage travelling wave tube of a submodule and each submodule of the first power converting circuit
The current direction of the corresponding voltage given value of element and each submodule of the first power converting circuit calculates described in obtaining
The duty ratio of each submodule of first power converting circuit, comprising:
The measured value and described first of the power-type energy-storage travelling wave tube for each submodule of the first power converting circuit that will acquire
The corresponding voltage given value superposition of the power-type energy-storage travelling wave tube of each submodule of power converting circuit is input to proportional plus integral control
Device obtains the first data of the pi controller output；
The current direction of first data and each submodule of the first power converting circuit is input to multiplier, is obtained
Second data of the multiplier output；
The duty ratio common mode component and the duty ratio differential-mode component of second data and acquisition is superimposed, obtain institute
State the duty ratio of each submodule of the first power converting circuit.
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