CN111740601B - Control method of energy storage direct current converter for wind power plan deviation compensation - Google Patents
Control method of energy storage direct current converter for wind power plan deviation compensation Download PDFInfo
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- CN111740601B CN111740601B CN202010740902.4A CN202010740902A CN111740601B CN 111740601 B CN111740601 B CN 111740601B CN 202010740902 A CN202010740902 A CN 202010740902A CN 111740601 B CN111740601 B CN 111740601B
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- 238000004146 energy storage Methods 0.000 title claims abstract description 47
- 238000000034 method Methods 0.000 title claims abstract description 26
- 239000003990 capacitor Substances 0.000 claims description 51
- 230000002457 bidirectional effect Effects 0.000 claims description 17
- 230000005540 biological transmission Effects 0.000 claims description 13
- 230000005684 electric field Effects 0.000 claims description 12
- 230000008569 process Effects 0.000 claims description 12
- 230000007704 transition Effects 0.000 claims description 6
- 230000001052 transient effect Effects 0.000 claims description 4
- 230000003139 buffering effect Effects 0.000 claims description 3
- 230000001960 triggered effect Effects 0.000 claims description 3
- 230000000295 complement effect Effects 0.000 claims 1
- 238000004886 process control Methods 0.000 claims 1
- 238000005516 engineering process Methods 0.000 abstract description 9
- 238000010248 power generation Methods 0.000 abstract description 9
- 238000010586 diagram Methods 0.000 description 5
- 230000008859 change Effects 0.000 description 3
- 238000011160 research Methods 0.000 description 3
- 238000011161 development Methods 0.000 description 2
- 238000007599 discharging Methods 0.000 description 2
- 238000002955 isolation Methods 0.000 description 2
- 238000012546 transfer Methods 0.000 description 2
- 238000009825 accumulation Methods 0.000 description 1
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- 230000009286 beneficial effect Effects 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
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Classifications
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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
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/02—Conversion of dc power input into dc power output without intermediate conversion into ac
- H02M3/04—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters
- H02M3/10—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M3/145—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
- H02M3/155—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M3/156—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators
- H02M3/158—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators including plural semiconductor devices as final control devices for a single load
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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
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
- H02J3/381—Dispersed generators
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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
- H02J2300/00—Systems for supplying or distributing electric power characterised by decentralized, dispersed, or local generation
- H02J2300/20—The dispersed energy generation being of renewable origin
- H02J2300/28—The renewable source being wind energy
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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
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/70—Wind energy
- Y02E10/76—Power conversion electric or electronic aspects
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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
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E70/00—Other energy conversion or management systems reducing GHG emissions
- Y02E70/30—Systems combining energy storage with energy generation of non-fossil origin
Abstract
The invention relates to the technical field of electrical technology and new energy power generation, in particular to a control method of an energy storage direct current converter for wind power planning deviation compensation. The method improves the accuracy of wind power grid-connected plan forecast, maintains the supply and demand balance of the power grid, effectively avoids the scheduling problem caused by large-scale wind power access to the power grid, reduces the spare capacity of power grid scheduling to a certain extent, and enhances the wind power grid-connected operation capability.
Description
Technical Field
The invention relates to the technical field of electrical technology and new energy power generation, in particular to a control method of an energy storage direct current converter for wind power plan deviation compensation.
Background
Intermittent fluctuation of wind power generation output power objectively and directly leads to low power quality of a power grid. With the increasing of the capacity of the wind power plant, the conventional filtering technology cannot be used for suppressing the fluctuation of the electric energy output of the wind power plant due to the power class constraint of the electronic power device. The large-proportion incorporation of the inferior electric energy tends to cause large fluctuation of power supply of the power grid system, further causes larger load peak-valley difference, and is extremely easy to induce low-voltage ride-through of the power grid, thereby increasing the collapse speed of the power grid.
Wind power enterprises are forced to take viable measures to convert wind power into schedulable electrical energy. Because the battery has flexible energy throughput characteristics, the battery can dynamically absorb or supplement redundant power or accumulated and underpower which cannot be expected in wind power plant power prediction, and the energy storage capacity development technology is continuously improved, a plurality of expert students consider that the application of the energy storage technology in the wind power field can effectively solve the fluctuation problem. On the basis, the new energy combined scheduling technology becomes a good medicine for the problem that wind power cannot be scheduled. By means of the deviation correction method, the accuracy of a plan (particularly a short-term plan) is improved, so that the power grid dispatching can reasonably arrange a power generation plan in advance, the relative balance of power generation and power generation is achieved, and the safe and stable operation of a power system is ensured. Meanwhile, the wind power plant can fully participate in power dispatching to obtain power generation priority, and the problem of new energy consumption is solved.
The bidirectional DC converter structure and the control technology greatly influence the popularization and application of energy storage, and the existing converter is divided into an isolated converter and a non-isolated converter from the electrical isolation perspective. The rapid development of technology has revealed various DC/DC switching converter structures, in which non-isolated type is further divided into single, double and four-tube. The most common of these three categories is the buck and boost type, and the buck-boost type that combines the two structures. Compared with an isolated converter, the non-isolated converter omits complex electrical isolation equipment such as a transformer, has lower cost, is relatively simple in control technology, is favored by the market, and is continuously researched by expert students. The current research results are mostly limited to unidirectional single-frequency control of the converter, and the multi-frequency control of the bidirectional power flow of the converter is involved, so that the research results are few, the results are rare, and the energy storage direct current converter for wind power grid-connected plan deviation compensation is few, and the wind power research results have certain engineering application value.
Disclosure of Invention
Aiming at the problems, the invention provides a control method of an energy storage direct current converter for wind power plan deviation compensation, which realizes smooth energy transfer in an energy storage element, achieves the aim of power plan deviation compensation by bidirectional energy flow under the control of a PWM (pulse-Width modulation) switch in a specific mode, and solves the problem that wind power grid-connected planning cannot be scheduled.
In order to achieve the above purpose, the technical scheme adopted by the invention is as follows:
a control method of an energy storage direct current converter for wind power plan deviation compensation comprises the following steps:
step 1, a bidirectional DC/DC converter is connected between energy storage equipment and a DC bus of an AC/DC converter, so that unidirectional energy flow is realized, and the aim of reliable power compensation is fulfilled; using a first switching tube S 1 And a second switching tube S 2 The combined working state of the device realizes unidirectional smooth transmission of energy; using a first unidirectional diode D1 and an energy storage discharge branch inductance L 21 Series connection of a second unidirectional diode D2 and an energy storage discharge branch inductance L 22 The parallel circuit is connected in series, so that reliable flow and switching of the energy throughput demand process are realized, and meanwhile, partial harmonic circulation in the circuit is absorbed;
step 2, the positive deviation and the negative deviation of the power plan respectively correspond to 2 different specific 5 state switch combination switching processes, and a specific mode is triggered by positive and negative signals of the deviation;
and step 3, synchronously starting a multi-channel PWM control signal of a switching tube in the bidirectional DC/DC converter according to the positive and negative power planning deviation monitored in real time, and flexibly embedding delay time in each complete energy unidirectional transmission process to realize the function of staggering and loading different frequency signals in the same switching tube, so that smooth transmission and reliable transmission of electric energy among different energy storage elements are realized.
Preferably, the step 2 includes the following steps:
step 2-1, the LC oscillating circuit is adopted to realize energy buffering in 2 identical transient processes in each complete period of energy throughput, and the LC oscillating circuit is used for realizing the current and voltage reverse demand function in the inductor and the capacitor;
step 2-2, when the power plan deviation is greater than zero, the state of the circuit (a 1) is started, the state of the circuit (e 1) is ended, and the state L of the circuit (e 1) 1 The freewheel releases energy to charge C; at this time once the deviation DeltaP<0, first switch tube S 1 And a second switching tube S 2 Switch on, L 1 A resonant circuit formed by C, a capacitor C for releasing energy through L 1 To the positive end of the capacitor, for natural transition to the forecast deviation DeltaP<The state of the circuit (a 1) of 0 is prepared;
step 2-3, when the power plan deviation is less than zero, the state of the circuit (a 2) is started, the state of the circuit (e 2) is ended, and L is the time of the state of the circuit (e 2) 1 The energy release ends until the current is almost 0, which is a natural transition to ΔP>L at 0 1 The reverse current path of the discharge is prepared.
The control method of the energy storage direct current converter for wind power plan deviation compensation has the following beneficial effects:
1. the bidirectional smooth flow of energy is realized through the cooperative compensation work of the bidirectional direct current converter variable period switching tube;
2. through the specific design of the bidirectional DC-DC converter structure, positive and negative compensation of grid-connected power planning deviation is reliably realized;
3. the reliable bidirectional converter works to improve the scheduling capability of wind power grid-connected power generation and reduce wind abandoning.
Drawings
FIG. 1 is a schematic diagram of the hardware architecture and corresponding PWM pulse signal control of the present invention;
FIG. 2 is a schematic diagram of the full cycle of energy compensation with the proposed invention with a deviation of the plan greater than zero;
FIG. 3 is a schematic representation of the full cycle of energy compensation with a planned deviation of less than zero in accordance with the present invention;
FIG. 4 is a schematic diagram of the present invention for predicting deviation of a continuous 30-day schedule and the relative error of a specific one-day schedule;
FIG. 5 is a schematic diagram of the PWM control pulse width of the combination switch of the present invention;
fig. 6 is a schematic diagram of the charge and discharge flow of the battery and supercapacitor according to the present invention during a 24 hour time-varying operation.
Detailed Description
The technical scheme of the invention is described below with reference to the accompanying drawings and examples.
In fig. 1: p (P) out For the actual output power of wind power generation, P g For wind power storage to actually output grid-connected power, P cc Represents a point of connection, P c Represents the energy storage charging power, P d Represents the energy storage discharge power, C d Is a direct current bus parallel capacitor, V d Is the voltage of a direct current bus, L 21 For the energy storage discharge branch inductance, L 22 The energy storage charging branch inductance is C is an energy storage capacitor, S 1 Is a first switch tube S 2 Is a second switch tube S 1 By two unidirectional switch-on switching tubes S 11 And S is 22 Parallel structure, i d For storing energy and discharging current, i c For storing energy and charging current, C sc Is super capacitor, R is resistor, V battery Is the battery voltage, T 1on1 Is a switching tube S in a complete period 1 T is equal to the first conduction duration of (1) 1off1 Is a switching tube S in a complete period 1 T is equal to the first off duration of (1) 1on2 Is a switching tube S in a complete period 1 Is of the second conduction duration, T 1off2 Switching tube S in complete period 1 Is of the second turn-off duration of T 2on1 Is a switching tube S in a complete period 2 T is equal to the first conduction duration of (1) 2off1 Is a switching tube S in a complete period 2 T is equal to the first off duration of (1) 2on2 Is a switching tube S in a complete period 2 Is of the second conduction duration, T 2off2 Switching tube S in complete period 2 Is provided for the second turn-off duration of (c).
As shown in fig. 1, the control method of the energy storage direct current converter for wind power plan deviation compensation provided by the invention comprises the following steps:
step 1, a bidirectional DC/DC converter is connected between energy storage equipment and a DC bus of an AC/DC converter, and energy storage can be performed in a complete period under the condition that wind power grid-connected plan deviation for compensating power is larger than or smaller than 0 (power plan deviation delta P is grid-connected plan power minus wind power actual output power), so that unidirectional energy flow is realized, and the aim of reliable power compensation is fulfilled; considering that the positive and negative deviations alternate at any time, in order to follow the working rule of the energy storage element, i.e. the inductance current cannot be suddenly changed and the capacitance voltage cannot be suddenly changed, a first switching tube S is adopted 1 And a second switching tube S 2 To achieve unidirectional smooth transfer of energy. Meanwhile, in order to prevent instant high-voltage breakdown device caused by abrupt change of inductance current direction at DC bus side in bidirectional energy throughput, a first unidirectional diode D1 and an energy storage discharge branch inductance L are adopted 21 Series connection of a second unidirectional diode D2 and an energy storage discharge branch inductance L 22 And the parallel circuit is connected in series, so that reliable flow and switching of the energy throughput demand process are realized, and part of harmonic circulation in the circuit is absorbed.
And 2, designing 5 switch combination transient switching processes for complete energy transmission each time, and using the same switch working combination state 2 times in the power deviation positive and negative compensation process in order to avoid the situation of instantaneous large current and high voltage in the energy transmission process caused by abrupt change of capacitance voltage and abrupt change of inductance current of the energy storage element. The positive deviation and the negative deviation of the power plan correspond to 2 different specific 5-state switch combination switching processes respectively, and a specific mode is triggered by positive and negative signals of the deviation, so that the energy storage element L1 and the capacitor C cannot damage devices due to energy accumulation.
And step 3, synchronously starting a multi-channel PWM control signal of a switching tube in the bidirectional DC/DC converter according to the positive and negative power planning deviation monitored in real time, and flexibly embedding delay time in each complete energy unidirectional transmission process to realize the function of staggering and loading different frequency signals in the same switching tube, so that smooth transmission and reliable transmission of electric energy among different energy storage elements are realized.
Fig. 2-3: v (V) E For the voltage of the hybrid energy storage side, i c For the energy storage side current of the converter, i L1 Is the inductance L 1 The current i flowing through CS I is the current flowing in the capacitor C d Is the inductance L 21 And L is equal to 22 Current flowing through V d Capacitor C on DC bus side of converter d The voltage across it.
The step 2 comprises the following steps:
and 2-1, realizing energy buffering by adopting an LC oscillating circuit in 2 identical transient processes in each complete period of energy throughput, and realizing a current and voltage reverse demand function in the inductor and the capacitor by means of the LC oscillating circuit.
As shown in FIG. 2, in step 2-2, when the power plan deviation is greater than zero, the state of the circuit (a 1) starts, the state of the circuit (e 1) ends, and the state L of the circuit (e 1) 1 The freewheel releases energy to charge C; at this time once the deviation DeltaP<0, first switch tube S 1 And a second switching tube S 2 Switch on, L 1 A resonant circuit formed by C, a capacitor C for releasing energy through L 1 To the positive end of the capacitor, for natural transition to the forecast deviation DeltaP<State of circuit (a 1) of 0Preparing. The method comprises the following steps:
in circuit a 1), when S 1 Conduction, S 2 When conducting, the battery charges C, and the inductor L 1 Energy storage, inductance L 21 Releasing energy to the DC bus capacitor; in the circuit b 1), when S 1 Cut-off, S 2 When conducting, inductance L 1 Converting stored electromagnetic energy into electric energy, transferring the electric energy into capacitor C for temporary storage, and simultaneously inducting L 21 Releasing the original stored energy to the DC bus capacitor; in circuit c 1), when S 1 Conduction, S 2 Inductance L when cut-off 1 Energy is stored, and the battery passes through the capacitor C and the inductor L 21 The direct current bus super capacitor forms a loop, and the capacitor C releases magnetic field energy and inductance L 21 Storing energy; in the circuit d 1), when S 1 Cut-off, S 2 When conducting, inductance L 1 Converting stored electromagnetic energy into electric energy, transferring the electric energy into capacitor C for temporary storage, and simultaneously inducting L 21 Releasing the original stored energy to the DC bus capacitor; in the circuit e 1), when S 1 Cut-off, S 2 Inductance L when cut-off 1 Continuously releasing magnetic field energy to be converted into electric field energy for storage in capacitor C, and inductance L 21 ，V d And the diode forming passage continuously releases magnetic field energy to the direct current bus and returns to the circuit a 1) to work. The above process, control S 2 The on-off time controls the discharge current i d I.e. the discharge power is controlled, and the corresponding adjustment of S is required for stabilizing the voltage of the DC bus 1 A duty cycle.
As shown in FIG. 3, in step 2-3, when the power plan deviation is less than zero, the state of the circuit (a 2) is started, the state of the circuit (e 2) is ended, and the state of the circuit (e 2) is L 1 The energy release ends until the current is almost 0, which is a natural transition to ΔP>L at 0 1 The reverse current path of the discharge is prepared. The method comprises the following steps:
circuits a 2), S 1 Cut-off, S 2 When conducting, the capacitor C releases the electric field energy to be converted into magnetic field energy to L 1 Storage, inductance L 22 Storing energy; in the circuit b 2), S 1 Conduction, S 2 When conducting, inductance L 22 Continuing to store energy, capacitor C and inductor L 1 At the same time to electricityThe cell releases energy and the battery charges until the inductance L 1 And (5) finishing energy release. In circuit c 2), S 1 Conduction, S 2 At cut-off, energy from the grid passes through the inductance L 22 Capacitor C charges the battery, inductance L 22 Storing magnetic field energy, and storing electric field energy; in circuit d 2), when S 1 Cut-off, S 2 When conducting, the capacitor C releases the electric field energy to be converted into magnetic field energy to L 1 Storage, inductance L 22 Freewheeling; in circuit e 2), when S 1 Conduction, S 2 At cut-off, energy from the grid passes through the inductance L 22 Capacitor C charges the battery, inductance L 22 The stored magnetic field energy is converted into electric field energy and stored in C; returning to circuit a 2) mode, inductance L 22 Store magnetic field energy, the electric field energy in the capacitor C passes through L 1 Conversion to magnetic field energy, overall regulation S 1 The charge current i can be controlled by the on-off time c I.e. charging power, while adjusting the corresponding S 2 The PWM duty cycle of the voltage control circuit maintains the voltage stability of the energy storage terminal.
As shown in fig. 4-6, as a practical application implementation result of the present invention, the charging and discharging signals of the energy storage come from the deviation of the grid-connected power plan and the actual output power of wind power, and under the action of the PWM trigger signals corresponding to different wave heads, the switching tubes work cooperatively to realize the bidirectional energy flow of the energy storage system, compensate the planned power deviation, and realize the schedulability of the plan.
In the description of the present invention, it should be understood that the terms "upper," "lower," "left," "right," and the like indicate an orientation or a positional relationship based on that shown in the drawings, and are merely for convenience of description and for simplifying the description, and do not indicate or imply that the apparatus or element in question must have a specific orientation, as well as a specific orientation configuration and operation, and thus should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more such feature. In the description of the present invention, unless otherwise indicated, the meaning of "a plurality" is two or more.
In the description of the present invention, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and the like are to be construed broadly and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present invention will be understood in specific cases by those of ordinary skill in the art.
The foregoing describes one embodiment of the present invention in detail, but the description is only a preferred embodiment of the present invention and should not be construed as limiting the scope of the invention. All equivalent changes and modifications within the scope of the present invention are intended to be covered by the present invention.
Claims (1)
1. A control method of an energy storage direct current converter for wind power plan deviation compensation is characterized by comprising the following steps: the method comprises the following steps:
step 1, a bidirectional DC/DC converter is connected between energy storage equipment and a DC bus of an AC/DC converter, so that bidirectional energy flow is realized, and the aim of reliable power compensation is fulfilled; the combined working state of the first switching tube S1 and the second switching tube S2 is adopted to realize unidirectional smooth transmission of energy; using a first unidirectional diode D1 and an energy storage discharge branch inductance L 21 Series connection of a second unidirectional diode D2 and an energy storage discharge branch inductance L 22 The parallel circuit is connected in series, so that reliable flow and switching of the energy throughput demand process are realized, and meanwhile, partial harmonic circulation in the circuit is absorbed;
wherein the bidirectional DC/DC converter comprises a first switching tube S1, a second switching tube S2 and an inductor L 1 Capacitor C and energy storage discharge branch inductance L 21 A first unidirectional diode D1, an energy storage discharge branch inductance L 22 And a second unidirectional diode D2; the left end point of the first switching tube S1 is connected with the anode of the battery; s1 right end point and inductor L 1 Is connected with the upper end point of the upper part; the right end point of the S1 is connected with the left end point of the capacitor C at the same time, the right end point of the capacitor C is connected with the upper end point of the second switch tube S2, and the first unidirectional diode D1 and the energy storage discharge branch inductance L 21 The series connection is a first branch, a second unidirectional diode D2 and an energy storage discharge branch inductance L 22 The series connection is a second branch, and the first branch is connected with the second branch in parallel; the left end of the parallel circuit is connected with the right end of the capacitor C, and the right end of the parallel circuit is connected with the DC bus capacitor C d Is connected with the upper end point of the upper part; at the same time, inductance L 1 Lower end of the switch tube S2, DC bus capacitor C d Is connected together to the negative electrode of the battery;
wherein the switching tube S in the first switching tube S1 11 And a switch tube S 22 Is a complementary anti-parallel structure;
step 2, the positive deviation and the negative deviation of the power plan respectively correspond to 2 different specific 5 state switch combination switching processes, and a specific mode is triggered by positive and negative signals of the deviation;
step 3, synchronously starting a multi-channel PWM control signal of a switching tube in the bidirectional DC/DC converter according to the positive and negative power planning deviation monitored in real time, and flexibly embedding delay time in each complete energy unidirectional transmission process to realize the function of staggering loading of different frequency signals in the same switching tube, so as to realize smooth transmission and reliable transmission of electric energy among different energy storage elements;
the step 2 comprises the following steps:
step 2-1, the same transient processes of 2 in each complete period of energy throughput adopt an LC oscillating circuit to realize energy buffering, and the inductance L is realized by virtue of the LC oscillating circuit 1 A current and voltage inverting demand function in the capacitor C;
step 2-2, when the power plan deviation is greater than zero, the state of the circuit (a 1) is started, the state of the circuit (e 1) is ended, and the state L of the circuit (e 1) 1 The freewheel releases energy to charge C; at this time once the power plan deviation Δp<0, the first switching tube S1 and the second switching tube S2 are connected, L 1 A resonant circuit formed by C, a capacitor C for releasing energy through L 1 To the positive terminal of the capacitor,for natural transition to power plan deviation ΔP<The state of the circuit (a 1) of 0 is prepared;
in the circuit (a 1), when S1 is turned on and S2 is turned on, the battery charges C and the inductor L 1 Energy storage, inductance L 21 Releasing energy to the DC bus capacitor; in the circuit (b 1), when S1 is turned off and S2 is turned on, the inductance L 1 Converting stored electromagnetic energy into electric energy, transferring the electric energy into capacitor C for temporary storage, and simultaneously inducting L 21 Releasing the original stored energy to the DC bus capacitor; in the circuit (c 1), when S1 is on and S2 is off, the inductance L 1 Energy is stored, and the battery passes through the capacitor C and the inductor L 21 The direct current bus super capacitor forms a loop, and the capacitor C releases magnetic field energy and inductance L 21 Storing energy; in the circuit (d 1), when S1 is turned off and S2 is turned on, the inductance L 1 Converting stored electromagnetic energy into electric energy, transferring the electric energy into capacitor C for temporary storage, and simultaneously inducting L 21 Releasing the original stored energy to the DC bus capacitor; in the circuit (e 1), when S1 is cut off and S2 is cut off, the inductance L 1 Continuously releasing magnetic field energy to be converted into electric field energy for storage in capacitor C, and inductance L 21 The diode D1 continuously releases magnetic field energy to the direct current bus and returns to the circuit (a 1) to work; the above process controls S2 on-off time, i.e. controls discharge current i d Namely, the discharge power is controlled, and the duty ratio of S1 is required to be correspondingly adjusted in order to stabilize the voltage of the direct current bus;
step 2-3, when the power plan deviation is less than zero, the state of the circuit (a 2) is started, the state of the circuit (e 2) is ended, and L is the time of the state of the circuit (e 2) 1 The energy release ends until the current is almost 0, for a natural transition to the power plan deviation Δp>L at 0 1 Preparing a reverse current path of discharge;
the circuit (a 2), S1 is cut off, and when S2 is conducted, the capacitor C releases electric field energy to be converted into magnetic field energy to L 1 Storage, inductance L 22 Storing energy; in the circuit (b 2), when S1 is turned on and S2 is turned on, the inductance L 22 Continuing to store energy, capacitor C and inductor L 1 Simultaneously releasing energy to the battery, charging the battery until the inductance L 1 The energy release is completed; in the circuit (c 2), when S1 is on and S2 is off, energy from the power grid passes through the inductor L 22 Capacitor C charges the battery, inductance L 22 Storing magnetic field energy, and storing electric field energy; in the circuit (d 2), when S1 is turned off and S2 is turned on, the capacitor C releases electric field energy to convert magnetic field energy into L 1 Storage, inductance L 22 Freewheeling; in the circuit (e 2), when S1 is on and S2 is off, energy from the power grid passes through the inductor L 22 Capacitor C charges the battery, inductance L 22 The stored magnetic field energy is converted into electric field energy and stored in C; returning to circuit (a 2) mode, inductance L 22 Store magnetic field energy, the electric field energy in the capacitor C passes through L 1 The charging current i can be controlled by changing the charging current into magnetic field energy and adjusting the on-off time of S1 c The charging power is adjusted, and the corresponding PWM duty ratio of S2 is adjusted to maintain the voltage stability of the energy storage terminal.
Priority Applications (1)
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