CN107565586A - A kind of stage type energy accumulation current converter active power controller method - Google Patents

A kind of stage type energy accumulation current converter active power controller method Download PDF

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CN107565586A
CN107565586A CN201710838850.2A CN201710838850A CN107565586A CN 107565586 A CN107565586 A CN 107565586A CN 201710838850 A CN201710838850 A CN 201710838850A CN 107565586 A CN107565586 A CN 107565586A
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bus
current
power
active power
voltage
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CN107565586B (en
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吕佃顺
许洪华
林资旭
王贵鹏
张海旺
张玉洁
李海东
武鑫
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BAODING CORONA CONTROL EQUIPMENT Co Ltd
Kenuo Weiye Wind Energy Equipment (beijing) Co Ltd
Beijing Corona Science and Technology Co Ltd
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BAODING CORONA CONTROL EQUIPMENT Co Ltd
Kenuo Weiye Wind Energy Equipment (beijing) Co Ltd
Beijing Corona Science and Technology Co Ltd
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Abstract

A kind of stage type energy accumulation current converter active power controller method, described stage type energy accumulation current converter include ac converter unit ACU and multiple direct current transformation cells D CU.Ac converter unit is controlled using ACU controllers, and each direct current transformation unit is controlled respectively using respective DCU controllers.ACU controllers receive the active power dispatch command of EMS, with reference to the stagnant ring PI control strategies based on DC bus-bar voltage, realize the quick tracking of active power dispatch command, while avoid triggering DC bus-bar voltage failure.Each DCU controllers receive the charge-discharge electric power instruction of battery management system, with reference to the sagging power distribution strategies based on DC bus-bar voltage and the control feedforwards of the asymmetric PI based on cell voltage are tactful, realize that active power during multiple direct current transformation cells D CU parallel runnings is distributed automatically, ensure that DC bus-bar voltage is stable, while meet that battery switches from constant current to the automatic smoothing of constant-voltage charge pattern.

Description

A kind of stage type energy accumulation current converter active power controller method
Technical field
The present invention relates to a kind of active power controller method applied to stage type energy accumulation current converter.
Background technology
With the continuous expansion of China's net capacity, peak-valley difference is continuously increased, regenerative resource, distributed energy supply and intelligence Flourishing for power network, also increasing to the demand of extensive energy storage industry, energy storage has turned into regenerative resource and intelligence electricity The main bottleneck of net extensive development.Large-scale wind power, solar grid-connected carry for scale application of the energy storage in power system Opportunity has been supplied, in type power system of renewable energy at high proportion, support technology that energy storage will necessitate.
At present, extensive energy storage includes two kinds of physics energy storage and electrochemical energy storage, and electrochemical energy storage is current forefront Energy storage technology.In recent years, the development of the electrochemical energy storage such as sodium-sulphur battery, flow battery and lithium ion battery technology is very fast, and development is latent Power is huge, has a extensive future.Wherein big as the flow battery capacity of representative using full vanadium, electrolyte is recyclable, has extended cycle life, Capacity and power can be separately designed, is expected to turn into the second largest energy storage mode after water-storage.
For electrochemical energy storage, in order to play the maximum efficiency of battery, ensure the service life of battery, realize battery and electricity Power interface between net, energy accumulation current converter PCS are equipment very crucial in system.In systems in practice, energy storage is typically carried on a shoulder pole The task of power system primary frequency modulation and inertia frequency modulation is born, energy accumulation current converter is to the response speed of active power dispatch command Very important performance assessment criteria.
Energy accumulation current converter is divided into two kinds of single stage type energy accumulation current converter and stage type energy accumulation current converter.Wherein, single stage type energy storage Current transformer mainly includes mono- link of ac converter unit ACU, suitable for the less occasion of battery charging and discharging voltage change range, Such as lithium ion battery and lead accumulator.When being incorporated into the power networks, AC inverter controls battery charging and discharging power according to dispatch command, Active power dispatch command can be responded quickly;During off-grid operation, AC inverter control ac output frequency and voltage.
Stage type energy accumulation current converter includes two links of ac converter unit ACU and direct current transformation cells D CU, can be flexible Matching exchange grid-connected voltage and DC battery voltage, simultaneously network electric energy quality and battery charging and discharging best performance are realized, is suitable for The all-vanadium flow battery that voltage reference terminal is wide, initial voltage of battery is zero, is applied widely.Due to stage type energy storage unsteady flow Device includes two links of ac converter unit and direct current transformation unit, is configured according to actual battery, typically there is multiple direct current transformations Unit, ac converter unit and the control of multiple direct current transformation units need to take into account the active power instruction that trace scheduling issues, straight Busbar voltage control and battery charging and discharging control are flowed, active power controller is become complicated.
Study the active power collaboration between stage type energy accumulation current converter internal communication inversion unit and direct current transformation unit Control, when being incorporated into the power networks can as single stage type energy accumulation current converter quick response active power dispatch command, off-network transport Ensure output frequency and quality of voltage during row, realize it is grid-connected and off-grid operation pattern it is smooth be switched fast, realize dc bus The stability contorting of voltage, it is significant.
Patent 201510447531.X《A kind of new two-stage type bidirectional energy-storage converter control system and its control method》 Stage type energy accumulation current converter control system hardware composition is provided, exchange microgrid power or voltage can be detected in real time and energy storage stores Battery charge state, flexibly control the operational mode of each TRT and energy accumulation current converter in micro-grid system but do not provide wattful power Rate control method.Document《The PCS control strategy research grid-connected for battery energy storage system》Cao Shengyun, Song Chun are peaceful etc. to use direct current Voltage transformation unit active power controls, the passive Power Control thinking of ac converter unit, completely the scheduling of hair active power can not quickly ring Answer demand.
The content of the invention
The purpose of the present invention is the shortcomings that overcoming prior art, there is provided a kind of suitable for the active of stage type energy accumulation current converter Poewr control method.
Stage type energy accumulation current converter includes ac converter unit ACU and multiple direct current transformation cells D CU.Described exchange is inverse Become unit ACU to control using ACU controllers, each direct current transformation cells D CU is controlled respectively using respective DCU controllers.Twin-stage Formula energy accumulation current converter receives and tracked the active power dispatch command that EMS EMS is issued, and internal system uses battery Management system BMS manages each direct current transformation unit, realizes multigroup battery charging and discharging control.
Inside stage type energy accumulation current converter, active power controller strategy includes ac converter unit ACU active power controls System and direct current transformation cells D CU active power controller two parts.The present invention is connect using the ACU controllers of stage type energy accumulation current converter Receive and track the active power dispatch command P that EMS EMS is issuedref, with reference to based on DC bus-bar voltage actual value UbusStagnant ring PI control strategies, realize the active power that stage type energy accumulation current converter quick response EMS EMS is issued Dispatch command, assist control DC bus-bar voltage stable, avoid triggering DC bus-bar voltage failure;Each stage type energy storage unsteady flow The DCU controllers of device receive the battery charging and discharging power instruction P that battery management system BMS is issuedbatx, with reference to based on dc bus Voltage actual value UbusSagging power distribution strategies, realize that the active power between each DCU controllers is distributed automatically;In combination with Based on cell voltage actual value UbatxAsymmetric PI control feedforward strategy, realize battery from constant current to constant-voltage charge pattern from It is dynamic to take over seamlessly.
The ac converter unit ACU controls of stage type energy accumulation current converter are realized by ACU controllers.ACU controllers gather Power network three-phase voltage Ugabc, line voltage active component U is calculated through phaselocked loop (PLL)gd;EMS EMS is issued Active power dispatch command PrefDivided by line voltage active component Ugd, obtain watt current and refer to median Igdref1;Setting DC bus-bar voltage reference value UbusrefSubtract DC bus-bar voltage actual value UbusEnter stagnant ring link afterwards, stagnant ring link output subtracts Watt current is gone to refer to the feedback K*I of offsetgdcomp, subtraction result enters PI controlling units, and the output of PI controlling units has Work(current reference offset Igdcomp.The addition of stagnant ring link, on the one hand ensure DC bus-bar voltage actual value UbusIn stagnant ring ring Wide △ UbusIn the range of when changing ac converter unit ACU quick and precisely track the active power that EMS EMS is issued and adjust Degree instruction, on the other hand ensures in DC bus-bar voltage actual value UbusChange exceeds stagnant ring ring width △ UbusAfterwards, begin participating in straight Busbar voltage control is flowed, avoids triggering DC bus-bar voltage failure.Watt current refers to offset feedback element K*IgdcompDraw Enter, ensure that ac converter unit ACU is to EMS EMS active power dispatch commands P during stable staterefError free tracking.
Watt current refers to median Igdref1Subtract watt current and refer to offset Igdcomp, obtain actual watt current ginseng Examine value Igdref.Actual watt current reference value IgdrefAfter electric current loop and PWM strategy, ac converter unit is output to ACU, realize the active power controller between stage type energy accumulation current converter and power network.
Each direct current transformation cells D CU is controlled respectively using respective DCU controllers, each DCU controllers control Strategy is identical.DCU active power controllers strategy includes two parts:The battery that Part I issues according to battery management system BMS Charge-discharge electric power instructs, and with reference to the sagging power distribution strategies based on DC bus-bar voltage, realizes multiple direct current transformation cells D CU Active power during parallel running is distributed automatically;Part II is the asymmetric PI control feedforward plans based on cell voltage actual value Slightly, realize that battery switches from constant current to the automatic smoothing of constant-voltage charge pattern.
For the sagging power distribution strategies based on DC bus-bar voltage, the DC bus-bar voltage reference value U of settingbusref Subtract DC bus-bar voltage actual value Ubus, then subtract the feedback R*I of charging currentchx, operation result charged through PID loop section Power reference median Pchref1;DC bus-bar voltage actual value UbusThrough differentiation elementAfter obtain Damping Power Pdamp, For damping the oscillation of power being likely to occur during the adjustment of discharge and recharge transient state;Charge power refers to median Pchref1Plus electricity The battery charging and discharging power instruction P that pond management system BMS is issuedbatx, then subtract Damping Power Pdamp, obtain charge power reference Value Pchref;Charge power reference value PchrefDivided by cell voltage actual value Ubatx, as a result through forward current amplitude limit+Lim and negative sense After current limit-Lim, obtain charging current and refer to median Ichref1
For the asymmetric PI control feedforward strategies based on cell voltage, the battery maximum voltage U of settingbatmaxSubtract electricity Cell voltage actual value Ubatx, operation result enters PI controlling units, and the output of PI controlling units is through forward current amplitude limit 0 and negative sense electricity After ductility limit width-Lim, obtain charging current and refer to feedforward value Ichref2.The output positive limiting of PI controlling units be 0 negative limiting for- Lim, so referred to as asymmetric PI controlling units.
The charging current of droop control power distribution strategies output based on DC bus-bar voltage refers to median Ichref1, The charging current for subtracting the control feedforward strategy outputs of the asymmetric PI based on cell voltage refers to feedforward value Ichref2, operation result After forward current amplitude limit+Lim and negative current amplitude limit-Lim, charging current reference value I is obtainedchref.Charging current refers to Value IchrefThrough electric current loop and PWM strategies, corresponding direct current transformation cells D CU is output to, realizes the charge-discharge electric power control of corresponding battery System.
It is an advantage of the current invention that EMS EMS active power dispatch command is directly issued to ACU controls Device, control ac converter unit ACU active power outputs, meets need of the system to energy accumulation current converter active power quick response Ask;ACU controllers use and are based on DC bus-bar voltage actual value UbusStagnant ring PI control strategies, quickly tracking energy management Avoid triggering DC bus-bar voltage failure while system EMS active power dispatch commands.Each DCU controllers are according to cell tube The battery charging and discharging power instruction that reason system BMS is issued, with reference to the sagging power distribution strategies based on DC bus-bar voltage, realize Active power between multiple direct current transformation cells D CU is distributed automatically;Cell voltage asymmetry PI control feedforward strategies can be Cell voltage actual value UbatxMore than the battery maximum voltage U of settingbatmaxAfterwards by producing charging reference current feedforward value Ichref2, charging current is referred into median Ichref1Shielding, realize and switch from constant current to the automatic smoothing of constant-voltage charge pattern.
Brief description of the drawings
Fig. 1 stage type energy accumulation current converter principle schematics;
Fig. 2 ac converter units ACU topologys;
Fig. 3 direct current transformation cells Ds CU topologys;
Fig. 4 stage type energy accumulation current converter active power controller strategies, wherein Fig. 4 a are ac converter unit ACU active power Control strategy, Fig. 4 b are direct current transformation cells D CU active power controller strategies.
Embodiment
The present invention is further illustrated below in conjunction with the drawings and specific embodiments.
Using the stage type energy accumulation current converter topology of the present invention as shown in figure 1, being divided into ac converter unit ACU and direct current change Press cells D CU two parts.
Ac converter unit ACU typically uses three-phase inverter mode, as shown in Figure 2.Ac converter unit ACU is included simultaneously Net switch S1, filter inductance L1, A phase power cells G11、G12, B phase power cell power G21、G22, C phase power cells G31、G32, Dc-link capacitance C1.Wherein grid-connected switch S1Output end be connected to AC network, DC capacitor C1Output end be connected to DCU。
Ac converter unit ACU active power controllers shown in Fig. 2 are realized in ACU controllers.In the present invention, ACU has Work(power control strategy as shown in fig. 4 a, comprises the steps of:
Step 1:User inputs setup parameter, including DC bus-bar voltage reference value Ubusref, the stagnant ring ring of DC bus-bar voltage Wide △ UbusOffset feedback factor K is referred to watt current;
Step 2:ACU controllers collection three-phase power grid voltage Ugabc, line voltage active component is calculated after phaselocked loop Ugd, as 100 in Fig. 4;The active power dispatch command P that EMS EMS is issuedrefDivided by line voltage active component Ugd Obtain watt current and refer to median Igdref1, as 101 in Fig. 4;
Step 3:DC bus-bar voltage reference value U in step 1busrefSubtract DC bus-bar voltage actual value Ubus, enter Ring width is △ UbusStagnant ring, such as in Fig. 4 110,111;Stagnant ring output subtracts the feedback K*I that watt current refers to offsetgdcomp, As 112 in Fig. 4;Subtraction result enters PI controlling units, and PI controlling units output watt current refers to offset Igdcomp, As 113 in Fig. 4.The addition of stagnant ring link, on the one hand ensure DC bus-bar voltage actual value UbusIn stagnant ring ring width △ UbusScope Ac converter unit ACU quick and precisely tracks the active power dispatch command P that EMS EMS is issued during interior changeref, On the other hand ensure in DC bus-bar voltage actual value UbusChange exceeds stagnant ring ring width △ UbusAfterwards, DC bus-bar voltage control is participated in System, prevent from triggering DC bus-bar voltage failure.Watt current refers to offset feedback element K*IgdcompAddition, ensure stable state When ac converter unit ACU to EMS EMS active power dispatch commands PrefError free tracking;
Step 4:The watt current that step 2 exports refers to median Igdref1The watt current of step 3 output is subtracted with reference to benefit Repay value Igdcomp, obtain actual watt current reference value Igdref, as 120 in Fig. 4;
Step 5:Actual watt current reference value IgdrefThrough 121 electric current loops and 122PWM modulation strategies in Fig. 4, it is output to ACU in Fig. 1, as 123 in Fig. 4, realize the active power controller between stage type energy accumulation current converter and power network.
Direct current transformation cells D CU typically uses buck chopping way, as shown in Figure 3.Direct current transformation cells D CU includes straight Flow bus-tie circuit breaker S2, dc-link capacitance C2, stepping-up/stepping-down chopper circuit G41、G42, load capacitance C3With load switch S3.It is wherein straight Flow bus-tie circuit breaker S2Output end connection figure 1 in ac converter unit ACU, load switch S3Output end connection figure 1 shown in Battery.
Multiple direct current transformation cells D CU in a set of stage type energy accumulation current converter system be present, such as DCU1 ... ... in Fig. 1, DCUn, n represent DCU quantity.Each direct current transformation cells D CU is controlled respectively using independent DCU controllers, in Fig. 1 DCU1 is controlled using DCU1 controllers, and DCUn is controlled using DCUn controllers, and each DCU controllers control strategy is identical.Do not lose Generality, the present invention represent that any one direct current transformation cells D CU, DCUx controller therein represents wherein any one with DCUx Individual DCU controllers, and use UbatxCell voltage corresponding to expression, IchxCharging current corresponding to expression, PbatxRepresent battery management The corresponding battery charging and discharging power that system BMS is issued.
DCU active power controllers strategy as shown in Figure 4 b, comprises the steps of in the present invention:
Step 1:User inputs setup parameter, including DC bus-bar voltage reference value Ubusref, the sagging coefficients R of charging current, Battery maximum voltage UbatMax, charging current amplitude limit value Lim;
Step 2:DC bus-bar voltage reference value U in step 1busrefSubtract DC bus-bar voltage actual value Ubus, then subtract Remove the sagging feedback R*I of charging currentchx, such as in Fig. 4 130,131, subtraction result obtains charge power through PID loop section and joined Examine median Pchref1, as 132 in Fig. 4;
Step 3:DC bus-bar voltage actual value UbusThrough differentiation elementAfter obtain Damping Power Pdamp, in Fig. 4 133, for damping oscillation of power caused by possibility during discharge and recharge transient state adjusts;
Step 4:Charge power refers to median Pchref1The battery charging and discharging power issued plus battery management system BMS Instruct Pbatx, then subtract Damping Power Pdamp, obtain charge power reference value Pchref, as 134 in Fig. 4;Charge power reference value PchrefDivided by cell voltage actual value Ubatx, as a result after forward current amplitude limit+Lim and negative current amplitude limit-Lim, filled Electric current reference median Ichref1, such as in Fig. 4 135,136.Step 2,3,4 compositions are based on DC bus-bar voltage actual value Ubus's Sagging power distribution strategies;
Step 5:Battery maximum voltage U in step 1batmaxSubtract cell voltage actual value Ubatx, as 140 in Fig. 4;Subtract Method operation result enters PI controlling units, and PI controlling units are exported after forward current amplitude limit 0 and negative current amplitude limit-Lim, obtained Feedforward value I is referred to charging currentchref2, such as in Fig. 4 141,142.The output positive limiting of PI controlling units be 0 negative limiting for- Lim, so referred to as asymmetric PI controlling units.Step 5 is based on cell voltage actual value UbatxAsymmetric PI control feedforward Strategy;
Step 6:The charging current exported in step 4 refers to median Ichref1Subtract the charging current ginseng exported in step 5 Examine feedforward value Ichref2, as 150 in Fig. 4, subtraction result passes through forward current amplitude limit+Lim and negative current amplitude limit-Lim Afterwards, charging current reference value I is obtainedchref, as 151 in Fig. 4;
Step 7:Charging current reference value IchrefAfter 152 electric current loops and 153PWM strategies in Fig. 4, it is output to corresponding Direct current transformation cells D CU, the active power controller as 154 in Fig. 4, realized corresponding direct current transformation cells D CU, fills to battery Electric discharge.

Claims (3)

1. a kind of stage type energy accumulation current converter active power controller method, described stage type energy accumulation current converter include ac converter Unit ACU and multiple direct current transformation cells D CU, it is characterised in that:Described ac converter unit ACU uses ACU controller controls System, each direct current transformation cells D CU are controlled respectively using respective DCU controllers;ACU controllers receive EMS EMS Active power dispatch command Pref, with reference to based on DC bus-bar voltage actual value UbusStagnant ring PI control, realize stage type store up Energy current transformer is to EMS active power dispatch commands PrefTracking, while avoid trigger DC bus-bar voltage failure;Each DCU controls Device processed receives the battery charging and discharging power instruction P that battery management system BMS is issuedbatx, with reference to actual based on DC bus-bar voltage Value UbusSagging power distribution strategies and based on cell voltage actual value UbatxAsymmetric PI control feedforward strategy, realize electricity Pond charge-discharge electric power control, realizes DC bus-bar voltage stability contorting, while meet battery from constant current to constant-voltage charge pattern Automatic smoothing switches.
2. stage type energy accumulation current converter active power controller method according to claim 1, it is characterised in that:ACU is controlled Device active power controller strategy includes herein below:
(1) EMS EMS is by active power dispatch command PrefIt is issued to ACU controllers, ACU controllers collection power network Three-phase voltage Ugabc, line voltage active component U is calculated through phaselocked loopgd;The active power scheduling that EMS EMS is issued Instruct PrefDivided by line voltage active component Ugd, obtain watt current and refer to median Igdref1
(2) the DC bus-bar voltage reference value U of settingbusrefSubtract DC bus-bar voltage actual value UbusEnter stagnant ring link afterwards, The output of stagnant ring link subtracts the feedback K*I that watt current refers to offsetgdcomp, into PI controlling units, PI controlling units are defeated Go out watt current and refer to offset Igdcomp
(3) watt current refers to median Igdref1Subtract watt current and refer to offset Igdcomp, obtain actual watt current ginseng Examine value Igdref;Actual watt current reference value IgdrefAfter electric current loop and PWM strategy, ac converter unit is output to ACU, realize the active power controller between stage type energy accumulation current converter and power network.
3. stage type energy accumulation current converter active power controller method according to claim 1, it is characterised in that:Each direct current Voltage transformation unit DCU is controlled respectively using respective DCU controllers, and each DCU controllers control strategy is identical;DCU is controlled Device active power controller strategy includes two parts:The battery charging and discharging power that Part I issues according to battery management system BMS Instruction, with reference to the sagging power distribution strategies based on DC bus-bar voltage actual value, realize that multiple direct current transformation cells D CU are in parallel Active power distribution during operation, Part II are the asymmetric PI control feedforward strategies based on cell voltage actual value, are realized Automatic smoothing transition of the battery from constant current to constant-voltage charge pattern;DCU controller active power controllers strategy includes herein below:
(1) for the sagging power distribution strategies based on DC bus-bar voltage, the DC bus-bar voltage reference value U of settingbusrefSubtract Remove DC bus-bar voltage actual value Ubus, then subtract the feedback R*I of charging currentchx, subtraction result enters PID loop section, PID Link output charge power refers to median Pchref1;DC bus-bar voltage actual value UbusThrough differentiation elementAfter obtain Damping Power Pdamp, for damping the oscillation of power being likely to occur during the adjustment of discharge and recharge transient state;Among charge power reference Value Pchref1The battery charging and discharging power instruction P issued plus battery management system BMSbatx, then subtract Damping Power Pdamp, obtain Charge power reference value Pchref;Charge power reference value PchrefDivided by cell voltage actual value Ubatx, as a result limited through forward current After width+Lim and negative current amplitude limit-Lim, obtain charging current and refer to median Ichref1
(2) for the asymmetric PI control feedforward strategies based on cell voltage, the battery maximum voltage U of settingbat maxSubtract electricity Cell voltage actual value Ubatx, subtraction result enters PI links, and the output of PI links limits through forward current amplitude limit 0 and negative current After width-Lim, obtain charging current and refer to feedforward value Ichref2
(3) charging current of the sagging power distribution strategies output based on DC bus-bar voltage refers to median Ichref1, subtract base Feedforward value I is referred in the charging current of the asymmetric PI control feedforward strategy outputs of cell voltagechref2, subtraction result warp After crossing forward current amplitude limit+Lim and negative current amplitude limit-Lim, charging current reference value I is obtainedchref;Charging current reference value IchrefAfter electric current loop and PWM strategies, corresponding direct current transformation cells D CU is output to, realizes the charge-discharge electric power control of corresponding battery System.
CN201710838850.2A 2017-09-18 2017-09-18 Active power control method of two-stage energy storage converter Expired - Fee Related CN107565586B (en)

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CN110347067A (en) * 2018-04-08 2019-10-18 湖南金杯新能源发展有限公司 Battery management system total voltage monitors circuit
CN109038533A (en) * 2018-09-01 2018-12-18 哈尔滨工程大学 A method of distribution division power auto-control is realized based on three Port Translation devices
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CN115313861A (en) * 2022-07-26 2022-11-08 上海海事大学 Control method based on two-stage bidirectional inverter parallel system
CN115313861B (en) * 2022-07-26 2024-05-17 上海海事大学 Control method based on two-stage bidirectional inverter parallel system
CN115579926A (en) * 2022-10-30 2023-01-06 广州菲利斯太阳能科技有限公司 Energy storage system and control method thereof
CN115579926B (en) * 2022-10-30 2023-08-08 广州菲利斯太阳能科技有限公司 Energy storage system and control method thereof
CN116365891A (en) * 2023-06-01 2023-06-30 湖南恩智测控技术有限公司 Multi-loop seamless switching control method, system, bidirectional power supply and medium
CN116365891B (en) * 2023-06-01 2023-08-22 湖南恩智测控技术有限公司 Multi-loop seamless switching control method, system, bidirectional power supply and medium

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