CN105071438A - Photovoltaic energy storage and power generation integrated grid-connected system - Google Patents
Photovoltaic energy storage and power generation integrated grid-connected system Download PDFInfo
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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
- Y02E10/50—Photovoltaic [PV] energy
- Y02E10/56—Power conversion systems, e.g. maximum power point trackers
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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
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Abstract
The invention discloses a photovoltaic energy storage and power generation integrated grid-connected system comprising a photovoltaic battery pack, a DC bus, a battery management system BMS, a converter group, a DC/AC inverter, a filter and a voltage-boosting transformer. The photovoltaic energy storage and power generation integrated grid-connected system is designed, and a photovoltaic power supply and storage batteries can be connected in parallel at a DC side to act as a distributed power supply to be integrally accessed to an electric power system through the same grid-connected inverter.
Description
Technical field
The present invention relates to photovoltaic parallel in system field, specifically a kind of photovoltaic energy storage power generation integrated formula grid-connected system.
Background technology
Through development for many years, photovoltaic generation just from the small-scale off-grid system in past, to large-scale grid connection generating future development.But because light and temperature is changeable, the power that photo-voltaic power generation station exports is also unstable, causes voltage fluctuation.When generated output reaches certain grade, power fluctuation can bring harm to operation of power networks; When disconnecting when electric network fault, stopping generates electricity by photovoltaic array, and solar energy utilization ratio is not high.
Summary of the invention
The object of this invention is to provide a kind of photovoltaic energy storage power generation integrated formula grid-connected system, to solve the grid-connected Problems existing of prior art photo-voltaic power generation station.
In order to achieve the above object, the technical solution adopted in the present invention is:
Photovoltaic energy storage power generation integrated formula grid-connected system, is characterized in that: comprise photovoltaic cell group, DC bus, battery management system BMS, converter groups, DC/AC inverter, filter and step-up transformer, wherein:
Described photovoltaic cell group is by BOOST booster converter access DC bus;
Described battery management system BMS is by battery pile management system BAUS, multiple battery cluster management system BCUS is formed, multiple battery cluster management system BCUS is connected with battery pile management system BAUS communication respectively by CAN or RS485 bus, each battery cluster management system BCUS is connected with multiple battery module managing unit B MU respectively by CAN, and each battery cluster management system BCUS manages different batteries bunch independently respectively by the battery module managing unit B MU connected separately, described battery bunch is in series or in parallel to form by multiple storage battery, the battery module managing unit B MU one_to_one corresponding that each battery cluster management system BCUS connects accesses the voltage signal of storage battery in corresponding battery bunch, temperature signal, heat signal, each battery cluster management system BCUS also directly accesses the current signal of storage battery in corresponding battery bunch, each battery bunch difference output voltage is to converter groups,
Described converter groups is made up of converter groups controller MCU, multiple two-way DC/DC converter, converter groups controller MCU is connected with battery pile management system BAUS communication by CAN or RS485 bus, the control end of multiple two-way DC/DC converter accesses converter groups controller MCU respectively, the input one_to_one corresponding of multiple two-way DC/DC converter accesses the output voltage of each battery bunch, and the output of multiple two-way DC/DC converter accesses DC bus respectively;
The input access DC bus of described DC/AC inverter, the output of DC/AC inverter is connected with the primary coil of step-up transformer, and the secondary coil of step-up transformer is incorporated to high-voltage fence;
Described filter is LC filter, between filter access DC/AC inverter output end and step-up transformer primary coil.
Described photovoltaic energy storage power generation integrated formula grid-connected system, it is characterized in that: the multiple battery module managing unit B MU be connected with it by each battery cluster management system BCUS form master-slave mode CAN communication network, in master-slave mode CAN communication network, battery cluster management system BCUS is main control unit, and multiple battery module managing unit B MU is respectively from control unit.
Described photovoltaic energy storage power generation integrated formula grid-connected system, it is characterized in that: described two-way DC/DC converter comprises switching tube Q1-Q4, T1-T2, and there is the transformer T of a primary coil, two secondary coils N21, N22, wherein the source electrode of switching tube Q1 is connected with the drain electrode of switching tube Q2, the source electrode of switching tube Q2 is connected with the drain electrode of switching tube Q3, the source electrode of switching tube Q3 is connected with the drain electrode of switching tube Q4, the drain electrode of corresponding battery bunch the voltage V1 exported, switching tube Q1 is accessed also successively by electric capacity C between the drain electrode of switching tube Q1, the source electrode of switching tube Q4
d1, electric capacity C
d2being connected with the source electrode of switching tube Q4, passing through inductance L from leading to wire between the source electrode and the drain electrode of switching tube Q3 of switching tube Q2
raccess transformer T primary coil one end, from electric capacity C
d1, electric capacity C
d2between lead to the wire access transformer T primary coil other end, transformer T two secondary coil N21, N22 connect mutually, after two secondary coil N21, N22 series connection, one end is connected to the drain electrode of switch transistor T 1, after two secondary coil N21, N22 series connection, the other end is connected to the drain electrode of switch transistor T 2, the source electrode of switch transistor T 1, T2 connects rear as two-way one of them output of DC/DC converter altogether, leads to wire and connect inductance L in the middle of two secondary coil N21, N22
fafterwards as two-way another output of DC/DC converter, two-way DC/DC converter two output is connected to DC bus to DC bus output voltage V2, and is connected with electric capacity C between two-way DC/DC converter two output
f, the grid of each switching tube Q1-Q4, T1-T2 accesses converter groups controller MCU respectively.
The present invention devises a kind of photovoltaic energy storage power generation integrated formula grid-connected system, by photo-voltaic power supply and storage battery at DC side parallel, overall through same combining inverter access electric power system as a distributed power source.
Advantage of the present invention is:
1, the integral type energy-storing and power-generating system that photovoltaic generation combines with energy-storage system has been initiated.Take peak clipping Pinggu principle, improve energy utilization rate largely.
2, due to the introducing of energy-storage system, by this for photovoltaic intermittent energy source, form power with BMS and stabilize system, improve the phenomenons such as the grid-connected power fluctuation of conventional photovoltaic is large, grid-connected comparatively steady.
3, independently energy-storage system is different from photovoltaic generation parallel connection nearby, and energy storage and photovoltaic design as a whole by the present invention, in charge and discharge control, electric energy scheduling, control strategy etc., have larger performance boost.
Accompanying drawing explanation
Fig. 1 is present system structure principle chart.
Fig. 2 is two-way DC/DC converter circuit figure in the present invention.
Fig. 3 is the SOC control area schematic diagram of two-way DC/DC convertor controls scheme in the specific embodiment of the invention.
Fig. 4 is the power outer shroud current inner loop control principle drawing of two-way DC/DC convertor controls scheme in the specific embodiment of the invention.
Fig. 5 is battery management system BMS structure principle chart in the present invention.
Fig. 6 is battery management system BMS internal structure control chart in the present invention.
Embodiment
As shown in Figure 1, Figure 2, shown in Fig. 5, Fig. 6, photovoltaic energy storage power generation integrated formula grid-connected system, comprises photovoltaic cell group, DC bus, battery management system BMS, converter groups, DC/AC inverter, filter and step-up transformer, wherein:
Photovoltaic cell group is by BOOST booster converter access DC bus;
Battery management system BMS is by battery pile management system BAUS, multiple battery cluster management system BCUS is formed, multiple battery cluster management system BCUS is connected with battery pile management system BAUS communication respectively by CAN or RS485 bus, each battery cluster management system BCUS is connected with multiple battery module managing unit B MU respectively by CAN, and each battery cluster management system BCUS manages different batteries bunch independently respectively by the battery module managing unit B MU connected separately, described battery bunch is in series or in parallel to form by multiple storage battery, the battery module managing unit B MU one_to_one corresponding that each battery cluster management system BCUS connects accesses the voltage signal of storage battery in corresponding battery bunch, temperature signal, heat signal, each battery cluster management system BCUS also directly accesses the current signal of storage battery in corresponding battery bunch, each battery bunch difference output voltage is to converter groups,
Converter groups is made up of converter groups controller MCU, multiple two-way DC/DC converter, converter groups controller MCU is connected with battery pile management system BAUS communication by CAN or RS485 bus, the control end of multiple two-way DC/DC converter accesses converter groups controller MCU respectively, the input one_to_one corresponding of multiple two-way DC/DC converter accesses the output voltage of each battery bunch, and the output of multiple two-way DC/DC converter accesses DC bus respectively;
The input access DC bus of DC/AC inverter, the output of DC/AC inverter is connected with the primary coil of step-up transformer, and the secondary coil of step-up transformer is incorporated to high-voltage fence;
Filter is LC filter, between filter access DC/AC inverter output end and step-up transformer primary coil.
The multiple battery module managing unit B MU be connected with it by each battery cluster management system BCUS form master-slave mode CAN communication network, in master-slave mode CAN communication network, battery cluster management system BCUS is main control unit, and multiple battery module managing unit B MU is respectively from control unit.
Two-way DC/DC converter comprises switching tube Q1-Q4, T1-T2, and there is the transformer T of a primary coil, two secondary coils N21, N22, wherein the source electrode of switching tube Q1 is connected with the drain electrode of switching tube Q2, the source electrode of switching tube Q2 is connected with the drain electrode of switching tube Q3, the source electrode of switching tube Q3 is connected with the drain electrode of switching tube Q4, the drain electrode of corresponding battery bunch the voltage V1 exported, switching tube Q1 is accessed also successively by electric capacity C between the drain electrode of switching tube Q1, the source electrode of switching tube Q4
d1, electric capacity C
d2being connected with the source electrode of switching tube Q4, passing through inductance L from leading to wire between the source electrode and the drain electrode of switching tube Q3 of switching tube Q2
raccess transformer T primary coil one end, from electric capacity C
d1, electric capacity C
d2between lead to the wire access transformer T primary coil other end, transformer T two secondary coil N21, N22 connect mutually, after two secondary coil N21, N22 series connection, one end is connected to the drain electrode of switch transistor T 1, after two secondary coil N21, N22 series connection, the other end is connected to the drain electrode of switch transistor T 2, the source electrode of switch transistor T 1, T2 connects rear as two-way one of them output of DC/DC converter altogether, leads to wire and connect inductance L in the middle of two secondary coil N21, N22
fafterwards as two-way another output of DC/DC converter, two-way DC/DC converter two output is connected to DC bus to DC bus output voltage V2, and is connected with electric capacity C between two-way DC/DC converter two output
f, the grid of each switching tube Q1-Q4, T1-T2 accesses converter groups controller MCU respectively.
Battery pile management system BAUS is made up of PC industrial computer, and battery cluster management system BCUS is made up of dsp processor, and battery module managing unit B MU is made up of low side ARM chip, and converter groups controller is also made up of dsp processor.
As shown in Figure 1, the present invention is made up of photovoltaic cell group, battery management system BMS, DC/DC reversible transducer group, DC/AC inverter, filter and step-up transformer.Battery management system BMS, by converter groups, connects into DC bus Udc respectively with photovoltaic cell group.Wherein, battery management system BMS is made up of battery pile management system BAUS, battery cluster management system BCUS (inner containing battery module managing unit B MU).Each BCUS manages a battery bunch (connection in series-parallel of storage battery), is incorporated to DC bus by two-way DC/DC converter.DC bus Udc is through DC/AC inverter, and inversion for exchanging 400V, then is incorporated to high-voltage fence by 400/10k (or 400/35k) step-up transformer.
1, in the present invention, two-way DC/DC converter serves the function served as bridge of photovoltaic system and energy-storage system energy exchange and complementation, is responsible for the charge and discharge control of storage battery.When charge in batteries, two-way DC/DC converter will use as Buck circuit, during electric discharge, then use as Boost circuit.
As shown in Figure 2, Fig. 2 adopts symmetrical structure, and the voltage stress that each switching tube bears is only the half of input direct voltage, is applicable to high-power occasion, and low-pressure side adopts push-pull circuit, and switching tube quantity is few, and structure is simple, and when short circuit appears in load, reliability is high.
In the present invention, two-way DC/DC convertor controls scheme is as follows:
For making grid-connected power P
outmeet the requirement of minute level active power variable quantity limit value, propose a kind ofly to utilize the level and smooth photovoltaic power output pulsation of battery energy storage system and the energy management control strategy being constraints with battery energy storage system SOC.
△P＝min(P
L1,0.1×P
L10)(1)
In formula: △ P is the power variation that minute level allows photovoltaic power fluctuation; P
l1, P
l10for photovoltaic power fluctuation minute/10 minutes level maximum active power variable quantity limit values.
If the photovoltaic power output in current k moment is P
v(k); The light storage synthesis output power value P of previous moment
out(k-1); Synthesis output power value from current time in 10min and P
v(k) difference maximum light storage synthesis output power value be P
out(k-n);
△P
1(k)＝|P
v(k)-P
v(k-1)|(2)
△P
10(k)＝|P
v(k)-P
out(k-n)|(3)
According to different photovoltaic powers fluctuation operating mode, determine the power P of the battery energy storage system in k moment
bat(k) output area:
1. as △ P
1(k) > P
l1time,
2. as △ P
10(k) > P
l10time,
3. as △ P
1(k)≤P
l1time,
4. as △ P
10(k)≤P
l10time,
When utilizing the level and smooth photovoltaic power of battery energy storage system to export, the maximum active power variable quantity of minute level/10 minute level of photovoltaic power output all can not be tapered to 0, therefore, the common factor that the power I/O scope of battery energy storage system is the power interval shown in formula (4) ~ (7), the scope of battery energy storage system I/O performance number when namely meeting control strategy.
While determining battery energy storage system power stage scope, the moment meets the following conditions battery energy storage system in the course of the work:
0≤P
out(k)≤P
N(8)
|P
bat(k)|≤P
bat_N(9)
In formula: P
outk light storage synthesis output power value that () is the k moment, MW; P
bat_Nfor the rated power of battery energy storage system, MW; P
nfor the installed capacity of photovoltaic plant, MWp.
For extending battery energy storage system useful life, and ensure the stored energy capacitance for subsequent use of battery energy storage system continuous firing, to improve for the purpose of battery energy storage system SOC, make battery energy storage system be operated in SOC is near 50% as far as possible, and the SOC control area schematic diagram of battery energy storage system as shown in Figure 3.
B
1, a
1, a
2, b
2for the SOC constraint factor that battery energy storage system normally runs.For efficiency utilization energy-storage system, and reduce the cost of investment of photovoltaic plant energy-storage system, according to the power I/O scope of battery energy storage system, under different SOC working condition, the input power/output power value of battery energy storage system is as follows:
1. 20%≤SOC (k) < b
1: battery energy storage system charge power is P
b_max, battery energy storage system discharge power is 0;
2. b
1≤ SOC (k) < a
1: battery energy storage system charge power is P
b_max, battery energy storage system discharge power is P
b_min;
③a
1≤SOC(k)≤a
2：
4. a
2< SOC (k)≤b
2: battery energy storage system charge power is P
b_min, battery energy storage system discharge power is P
b_max;
5. b
2< SOC (k)≤80%: battery energy storage system charge power is P
b_min, battery energy storage system discharge power is P
b_max;
If 6. battery energy storage system SOC is SOC (k) < 20% or SOC (k) > 80%, battery energy storage system does not work.
Wherein, P
b_max, P
b_minbe respectively maximum and the minimum value of the I/O power bracket internal power value of battery energy storage system.
Can choice for use power ring control mode as shown in Figure 4.
Fig. 4 is power outer shroud current inner loop control principle drawing.The fluctuating power P that photovoltaic array sends
vwith the actual power value P detected
outcompare, obtain power difference Δ P, amplitude limit 1 is dynamic slice, and amplitude limit strategy is with reference to formula (1) ~ (9).Value and storage battery power output P after amplitude limit
baterror e 1 through pi regulator, amplitude limit 2 is dynamic slice, and amplitude limit strategy, with reference to SOC constraint factor, obtains the operating current reference value I of storage battery through amplitude limit 2
*, I
*with storage battery output current I
batcompare, error e 2 obtains the control signal of two-way DC/DC converter after PI with triangle wave, thus the mode of operation of two-way DC/DC converter is switched between charging and discharging.Power difference Δ P>0, shows battery discharging; Δ P<0, shows charge in batteries.
2, battery management system BMS:
Battery management system (BMS) is as one of the key technology of photovoltaic energy storage system, there is very large development in recent years, but still perfect not, especially all need to be further improved and enhanced in the reliability of image data, the estimation precision of SOC and safety management etc.Therefore, the various external characteristics of lithium ion battery should be analyzed, apply the technology such as multiple communication, Based Intelligent Control, data storage, develop a set of possess accurate parameters collection and battery status is estimated, intelligent recharge and discharge controls and heat management, reliable and stable correspondence with foreign country ability battery management system, safe and reliable, the Effec-tive Function of effective guarantee photovoltaic energy storage lithium battery group.
The BMS system configuration of 2.11MWh capacity as shown in Figure 5,
BMS, for using the energy-storage battery array that iron lithium phosphate/lithium manganate battery is energy-storage units, completes array condition monitoring, protection, the functions such as warning.Large-scale energy-storage system adopts employing three layers of modular construction, comprises the assemblies such as battery pile management system (BAUS), battery cluster management system (BCUS), battery module managing unit (BMU).System for supporting with core technologies such as high-accuracy voltage detection and the equilibriums of active big current, is carried out omnibearing management and protection to battery pack, is maximized prolongation energy-storage battery and pile useful life.
A BCUS manages a battery bunch, and for the energy-storage system of 1MWh capacity, each battery bunch capacity is set as 200KWh.Each 200KWh battery bunch is composed in series by 180 3.2V/360Ah element cells, and operating voltage range is 450 ~ 657V, and rated voltage is 576V (according to the actual requirements, can set different batteries bunch capacity).
1MWh energy-storage units is made up of 5 200KWh battery bunch parallel connections, and each BMU manages 12 element cells.That is: BMS system is made up of (180/12*5=75) 5 BCUS and 75 BMU.
BAUS collects each BCUS information, by CAN/485 bus, relevant charge/discharge control command is sent to CVT_MCU, and then carries out discharge and recharge by converter groups to battery pack.
2.2BMS internal structure and communication plan are as shown in Figure 6.
In BMS system, BCUS can be described as the core component of system, middle hinge belt.Packing after the BMU data centralization of bottom is sent to high-rise BAUS by it, has local interpersonal interface simultaneously, large data store the module such as (SD card), real-time clock, has the functions such as RS232 (local debugging) and contactor control.BMS entirety is divided into 3 grades of network service management:
15 BMU in each BCUS and group form inner CAN communication network (IN_CAN) of master-slave mode.The data acquisition of the monomer voltage of BMU (from control unit) this case battery of primary responsibility and temperature etc., self-inspection, battery consistency judge and Balance route, and respond the order of BCUS (main control unit), the voltage of this case battery, temperature information are regularly returned BCUS.The data that BCUS is responsible for measuring assembled battery total voltage, collects BMU and high pressure strong power part, carry out collective analysis and process to battery data, judge the fault of present battery, carry out early warning and the warning of battery system; And the SOC that the data fully utilizing battery carry out battery estimates, predict remaining battery bunch electricity (SOC estimates also to be responsible for by BAUS).
High-rise CAN communication network is formed between 5 BCUS and BAUS.BCUS provides the information such as total voltage, total current, dielectric strength, SOC of battery bunch in real time, optimizes the use procedure of battery; BAUS realizes the display of battery bunch detailed data, realize comprehensive statistics and the data mining of data, on-line analysis affects the Parameter Conditions in battery performance and life-span, take the multiple means such as intelligent machine study, pattern recognition, data fusion, Predict is made to the security and stability of BMS, and failure diagnosis.BAUS can be shared by the network of the real-time performance information such as ETHERNET, the functions such as remote access.
As shown in Figure 6, BAUS and converter are rented between controller CVT_MCU and are formed CAN/485 network.Wherein 485 just when CAN network lost efficacy, as a kind of Means of Ensuring of secure communication.After BAUS receives the packet of each BCUS, and the overall control strategy of comprehensive PV system and PV data (inverter MCU-->BAUS), decision-making carries out charge and discharge control to different BCUS, or isolated operation, and control command is performed to CVT_MCU by CAN/485 Internet Transmission.
Claims (3)
1. photovoltaic energy storage power generation integrated formula grid-connected system, is characterized in that: comprise photovoltaic cell group, DC bus, battery management system BMS, converter groups, DC/AC inverter, filter and step-up transformer, wherein:
Described photovoltaic cell group is by BOOST booster converter access DC bus;
Described battery management system BMS is by battery pile management system BAUS, multiple battery cluster management system BCUS is formed, multiple battery cluster management system BCUS is connected with battery pile management system BAUS communication respectively by CAN or RS485 bus, each battery cluster management system BCUS is connected with multiple battery module managing unit B MU respectively by CAN, and each battery cluster management system BCUS manages different batteries bunch independently respectively by the battery module managing unit B MU connected separately, described battery bunch is made up of multiple storage battery connection in series-parallel, the battery module managing unit B MU one_to_one corresponding that each battery cluster management system BCUS connects accesses the voltage signal of storage battery in corresponding battery bunch, temperature signal, heat signal, each battery cluster management system BCUS also directly accesses the current signal of storage battery in corresponding battery bunch, each battery bunch difference output voltage is to converter groups,
Described converter groups is made up of converter groups controller MCU, multiple two-way DC/DC converter, converter groups controller MCU is connected with battery pile management system BAUS communication by CAN or RS485 bus, the control end of multiple two-way DC/DC converter accesses converter groups controller MCU respectively, the input one_to_one corresponding of multiple two-way DC/DC converter accesses the output voltage of each battery bunch, and the output of multiple two-way DC/DC converter accesses DC bus respectively;
The input access DC bus of described DC/AC inverter, the output of DC/AC inverter is connected with the primary coil of step-up transformer, and the secondary coil of step-up transformer is incorporated to high-voltage fence;
Described filter is LC filter, between filter access DC/AC inverter output end and step-up transformer primary coil.
2. photovoltaic energy storage power generation integrated formula grid-connected system according to claim 1, it is characterized in that: the multiple battery module managing unit B MU be connected with it by each battery cluster management system BCUS form master-slave mode CAN communication network, in master-slave mode CAN communication network, battery cluster management system BCUS is main control unit, and multiple battery module managing unit B MU is respectively from control unit.
3. photovoltaic energy storage power generation integrated formula grid-connected system according to claim 1, it is characterized in that: described two-way DC/DC converter comprises switching tube Q1-Q4, T1-T2, and there is a primary coil, two secondary coil N21, the transformer T of N22, wherein the source electrode of switching tube Q1 is connected with the drain electrode of switching tube Q2, the source electrode of switching tube Q2 is connected with the drain electrode of switching tube Q3, the source electrode of switching tube Q3 is connected with the drain electrode of switching tube Q4, the drain electrode of switching tube Q1, the corresponding battery bunch voltage V1 exported is accessed between the source electrode of switching tube Q4, the drain electrode of switching tube Q1 is also successively by electric capacity C
d1, electric capacity C
d2being connected with the source electrode of switching tube Q4, passing through inductance L from leading to wire between the source electrode and the drain electrode of switching tube Q3 of switching tube Q2
raccess transformer T primary coil one end, from electric capacity C
d1, electric capacity C
d2between lead to the wire access transformer T primary coil other end, transformer T two secondary coil N21, N22 connect mutually, after two secondary coil N21, N22 series connection, one end is connected to the drain electrode of switch transistor T 1, after two secondary coil N21, N22 series connection, the other end is connected to the drain electrode of switch transistor T 2, the source electrode of switch transistor T 1, T2 connects rear as two-way one of them output of DC/DC converter altogether, leads to wire and connect inductance L in the middle of two secondary coil N21, N22
fafterwards as two-way another output of DC/DC converter, two-way DC/DC converter two output is connected to DC bus to DC bus output voltage V2, and is connected with electric capacity C between two-way DC/DC converter two output
f, the grid of each switching tube Q1-Q4, T1-T2 accesses converter groups controller MCU respectively.
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| CN111355281A (en) * | 2020-03-26 | 2020-06-30 | 国网江西省电力有限公司电力科学研究院 | Vehicle-mounted movable energy storage system |
| CN111347143A (en) * | 2020-04-07 | 2020-06-30 | 中国铁道科学研究院集团有限公司金属及化学研究所 | High-power super battery energy storage and power supply flash welding machine |
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| CN111347143A (en) * | 2020-04-07 | 2020-06-30 | 中国铁道科学研究院集团有限公司金属及化学研究所 | High-power super battery energy storage and power supply flash welding machine |
| CN111799854A (en) * | 2020-04-07 | 2020-10-20 | 中国铁道科学研究院集团有限公司金属及化学研究所 | Super energy storage battery management system suitable for flash welding machine or postweld heat treatment machine |
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