CN112436501B - An improved balance control method for multiple energy storage units in DC microgrid - Google Patents
An improved balance control method for multiple energy storage units in DC microgrid Download PDFInfo
- Publication number
- CN112436501B CN112436501B CN202011289005.2A CN202011289005A CN112436501B CN 112436501 B CN112436501 B CN 112436501B CN 202011289005 A CN202011289005 A CN 202011289005A CN 112436501 B CN112436501 B CN 112436501B
- Authority
- CN
- China
- Prior art keywords
- energy storage
- storage unit
- microgrid
- soc
- storage units
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
- 238000004146 energy storage Methods 0.000 title claims abstract description 86
- 238000000034 method Methods 0.000 title claims abstract description 33
- 238000005070 sampling Methods 0.000 claims abstract description 19
- 238000007599 discharging Methods 0.000 claims abstract description 15
- 230000003044 adaptive effect Effects 0.000 claims abstract description 10
- 238000006243 chemical reaction Methods 0.000 claims description 24
- 230000014509 gene expression Effects 0.000 claims description 20
- 230000002457 bidirectional effect Effects 0.000 claims description 18
- 239000003990 capacitor Substances 0.000 claims description 3
- 238000010276 construction Methods 0.000 claims 1
- 238000010586 diagram Methods 0.000 description 8
- 230000008569 process Effects 0.000 description 7
- 230000008859 change Effects 0.000 description 3
- 238000009825 accumulation Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 230000002411 adverse Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
Images
Classifications
-
- 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
- H02J1/00—Circuit arrangements for DC mains or DC distribution networks
- H02J1/10—Parallel operation of DC sources
- H02J1/106—Parallel operation of DC sources for load balancing, symmetrisation, or sharing
-
- 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
- H02J1/00—Circuit arrangements for DC mains or DC distribution networks
- H02J1/14—Balancing the load in a network
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Dc-Dc Converters (AREA)
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
Abstract
本发明涉及电气控制领域，具体涉及一种直流微电网多储能单元的改进均衡控制方法，包括构建直流微电网多储能单元的均衡控制电路，根据自身荷电状态参数构造单调递增函数，将其引入储能单元改进下垂控制环路，形成控制系统的参考电压；参考电压与采样所得的输出电压和输入电流构成双闭环控制系统，由数字控制器输出占空比控制信号，驱动开关功率器件，实现储能单元的无通信自适应下垂控制；本发明采用一种算法应用于储能单元的充电和放电两种工作模式，无需切换，且不需要对接口变换器输出电流进行采样，简化了控制器的设计。
The invention relates to the field of electrical control, in particular to an improved equalization control method for multiple energy storage units in a direct current microgrid, including constructing an equalization control circuit with multiple energy storage units in a direct current microgrid, constructing a monotonically increasing function according to its own state-of-charge parameters, and It introduces an energy storage unit to improve the droop control loop and forms the reference voltage of the control system; the reference voltage, the sampled output voltage and input current form a double closed-loop control system, and the digital controller outputs the duty cycle control signal to drive the switching power device. , realize the communication-free adaptive droop control of the energy storage unit; the present invention adopts an algorithm to apply to the two working modes of charging and discharging of the energy storage unit, without switching, and without sampling the output current of the interface converter, which simplifies the Controller design.
Description
Technical Field
The invention relates to the field of electrical control, in particular to an improved balance control method for multiple energy storage units of a direct-current micro-grid.
Background
In recent years, micro-grids have received much attention from various academic circles as power supply systems that integrate distributed energy sources, energy storage elements, and power converters. The direct-current micro-grid is used as a reliable and efficient power supply mode, and becomes an important form of a future intelligent power distribution system by virtue of the advantages of strong system reliability, high transmission efficiency and no need of considering phase, reactive power and harmonic problems.
The direct-current micro-grid is used as a small-inertia weak support system, generally has small capacity and does not have good anti-interference capability. In order to meet the requirements of stable operation and capacity increase configuration of the system, Energy Storage Units (ESUs) in the Energy Storage system are generally connected in parallel in a distributed manner to a direct current bus. However, with the access of multiple energy storage units, the inconsistency of the State of Charge (SoC) among the units may cause the overcharge and discharge of some energy storage units and the frequent switching of the system, thereby seriously affecting the service life of the energy storage units and even endangering the stability of the microgrid.
With the gradual and deep research on the Energy Storage system of the DC Microgrid, some researchers have proposed Adaptive Droop Control based on the SoC of the Energy Storage unit, for example, as the published documents "dynamic distribution method of load power with bus voltage drop compensation function in the Energy Storage system of the DC Microgrid" and "State-of-Charge Balance Using Adaptive Droop Control for Distributed Energy Storage Systems in DC Microgrid Applications", the Droop coefficient in the Droop Control is associated with the SoC, and the Droop curve is dynamically adjusted through the real-time change of the SoC, so as to finally realize the SoC Balance of each Energy Storage unit and the balanced distribution of the load power. On the basis of the theory, the document 'Double-queue State-of-Charge-Based Droop Control Method for Distributed Energy Storage Systems in Autonomous DC Microgrids' further applies the adaptive Droop Control to the charging and discharging modes.
However, the control method proposed in the above document ignores the line resistance between the output end of the converter and the dc bus, the droop control expressions corresponding to the charging and discharging processes are different, and the controller needs to be frequently switched during the dynamic conversion process of the energy storage unit during the charging and discharging, which increases the design difficulty of the controller and also brings adverse effects to the control effect of the system.
Based on the above, the invention designs an improved balance control method for multiple energy storage units of a direct current micro-grid, so as to solve the above problems.
Disclosure of Invention
The invention aims to solve the problems in the prior art and provides an improved balance control method for multiple energy storage units of a direct current micro-grid.
In order to achieve the purpose, the invention provides the following technical scheme:
an improved balance control method for multiple energy storage units of a direct-current micro-grid comprises the following steps:
the method comprises the following steps: the method comprises the following steps of constructing a balance control circuit of the multiple energy storage units of the direct-current microgrid, wherein the balance control circuit of the multiple energy storage units of the direct-current microgrid comprises a DC-DC bidirectional conversion circuit, an input current sampling circuit, an output voltage sampling circuit, an A/D conversion circuit and a digital controller, one end of the DC-DC bidirectional conversion circuit is connected with the energy storage units, and the other end of the DC-DC bidirectional conversion circuit is connected with a direct-current bus of the direct-current microgrid through a line;
step two: the energy storage unit estimates the state of charge (SoC) of the energy storage unit, constructs a monotone increasing function according to real-time parameters of the SoC, and introduces the monotone increasing function into an energy storage unit self-adaptive droop control loop to form an improved reference voltage droop expression;
step three: comparing the reference voltage with the sampled output voltage, and forming voltage outer loop control through a PI controller and an amplitude limiter;
step four: comparing the voltage outer ring output with the sampled input current, and generating a PWM signal through a PI controller to form current inner ring control;
step five: the digital controller outputs a PWM signal to drive a switching power device of the DC-DC bidirectional conversion circuit, and the communication-free self-adaptive droop control of the energy storage unit is realized.
Further, the expression of the SoC real-time parameter constructing monotonic increasing function in the second step is as follows:
wherein k and n are both droop curve adjustment factors and are used for adjusting the SoC equalization rate; and delta is a bus deviation adjustment factor and is used for adjusting the bus voltage deviation range.
Further, the modified reference voltage droop expression in the second step is as follows:
Voi*＝vdc+f(SoCi)；
wherein, Voi *Is the output voltage reference of the ith converter; v. ofdcThe given initial voltage is the rated voltage of the direct current bus.
Further, the DC-DC bidirectional conversion circuit in the first step comprises an input capacitor CinInductor L and switch tube QH、QLAnd an output capacitor Co。
Further, in the first step, the input current sampling circuit and the output voltage sampling circuit pass through the sampling resistor and are sequentially connected with the A/D conversion circuit and the digital controller in series, and the output end of the digital controller is connected with a switching tube Q in the DC-DC bidirectional conversion circuitH、QL。
Further, the improved reference voltage droop expression can be applied to two modes of charging and discharging the energy storage unit.
Compared with the prior art, the invention has the beneficial effects that:
1. the balance control method provided by the invention can complete self-adaptive SoC droop control of the direct current micro-grid energy storage unit under two working modes of charging and discharging by using a reference voltage droop expression without switching a controller. However, in the prior art, two different droop expressions are mostly adopted in the charging mode and the discharging mode, so that the two corresponding controllers need to be frequently switched according to different working modes of the energy storage unit in the operation process.
2. The balance control method provided by the invention adopts an improved reference voltage droop expression, has a simple form, does not need to sample the output current of the energy storage unit, and omits a droop coefficient, thereby greatly simplifying the design of the controller. In the prior art, the output current needs to be sampled, the self-adaptive droop control of the energy storage unit is realized by setting the droop coefficient, the sampling data is more, and the design difficulty of the controller is increased.
3. According to the method, a monotone increasing function is constructed according to the real-time parameters of the SoC, k and n are set as droop curve adjusting factors, and delta is a bus deviation adjusting factor and can be flexibly selected according to the bus voltage rated value and the specification of the power converter.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a schematic diagram of a DC micro-grid structure with multiple energy storage units according to the present invention;
fig. 2 is an equivalent structure circuit model of a dc micro-grid with two energy storage units connected in parallel for output after adaptive droop control in the embodiment of the present invention;
FIG. 3 is a schematic diagram of a dynamic adjustment process of droop control to load current in view of line resistance according to the present invention;
FIG. 4 is a block diagram of a multi-energy storage unit SoC balance control system according to the present invention;
fig. 5 is a waveform diagram of the output current of the converter and SoC during the dynamic charge and discharge operation of the energy storage system of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1-5, the present embodiment provides a technical solution: an improved balance control method for multiple energy storage units of a direct-current micro-grid comprises the following steps:
the method comprises the following steps: the method comprises the following steps of constructing a balance control circuit of the multiple energy storage units of the direct-current microgrid, wherein the balance control circuit of the multiple energy storage units of the direct-current microgrid comprises a DC-DC bidirectional conversion circuit, an input current sampling circuit, an output voltage sampling circuit, an A/D conversion circuit and a digital controller, one end of the DC-DC bidirectional conversion circuit is connected with the energy storage units, and the other end of the DC-DC bidirectional conversion circuit is connected with a direct-current bus of the direct-current microgrid through a line;
step two: the energy storage unit estimates the state of charge (SoC) of the energy storage unit, constructs a monotone increasing function according to real-time parameters of the SoC, and introduces the monotone increasing function into an energy storage unit self-adaptive droop control loop to form an improved reference voltage droop expression;
step three: comparing the reference voltage with the sampled output voltage, and forming voltage outer loop control through a PI controller and an amplitude limiter;
step four: comparing the voltage outer ring output with the sampled input current, and generating a PWM signal through a PI controller to form current inner ring control;
step five: the digital controller outputs a PWM signal to drive a switching power device of the DC-DC bidirectional conversion circuit, and the communication-free self-adaptive droop control of the energy storage unit is realized.
In the second invention step, the expression of the SoC real-time parameter structure monotone increasing function is as follows:
wherein k and n are both droop curve adjustment factors and are used for adjusting the SoC equalization rate; and delta is a bus deviation adjustment factor and is used for adjusting the bus voltage deviation range.
The improved reference voltage droop expression in step two of the invention is as follows:
Voi*＝vdc+f(SoCi)； (2)
wherein, Voi *Is the output voltage reference of the ith converter; v. ofdcThe given initial voltage is the rated voltage of the direct current bus.
In the first step of the invention, the DC-DC bidirectional conversion circuit comprises an input capacitor CinInductor L and switch tube QH、QLAnd an output capacitor Co. In the first step of the invention, an input current sampling circuit and an output voltage sampling circuit pass through a sampling resistor and then are sequentially connected with an A/D conversion circuit and a voltage sampling circuitThe digital controllers are connected in series, and the output end of the digital controller is connected with a switching tube Q in a DC-DC bidirectional conversion circuitH、QL. The improved reference voltage droop expression can be applied to two modes of charging and discharging of the energy storage unit, frequent switching of a controller in the dynamic charging and discharging change process of the traditional droop control is avoided, meanwhile, sampling of output current of the energy storage unit is not needed, and a droop coefficient is omitted, so that the design of the controller is greatly simplified.
One specific application of this embodiment is: as shown in fig. 1, in the dc microgrid with multiple energy storage units, the energy storage units are connected to a dc bus of the dc microgrid through a bidirectional Buck/Boost interface converter via a line, a rated voltage of the bus is selected to be 48V, and line resistances between the converter and the dc bus are considered to be equal. The energy storage units output PWM control signals by the corresponding controllers to drive the interface converters to realize the charging and discharging of the energy storage units, so that the stability of the direct-current micro-grid is maintained. The controllers are not interconnected and communicated with each other, and are distributed and autonomous control.
The method adopts a mode of combining an open-circuit voltage method with a charge accumulation method to estimate the SoC of the energy storage unit, and specifically comprises the steps of firstly measuring the open-circuit voltage of the energy storage unit, calculating the initial SoC, defining the initial SoC as SoCi _0, wherein i represents the ith group of energy storage units, and then calculating the SoC according to the charge accumulation method. Taking an energy storage system composed of 2 energy storage units as an example, the SoC calculation formula of the energy storage unit is as follows:
in the formula ibat1、ibat2The input currents of the ESU # 1 interface converter and the ESU # 2 interface converter are respectively.
FIG. 2 is an equivalent structure circuit model of a DC micro-grid with two parallel energy storage units for output after adaptive droop control, wherein V iso1And Vo2The output voltages of the two converters are respectively; rd1、Rd2Sag coefficients for ESUs # 1 and ESUs # 2, respectively; r islFor connecting interface converters with dcA line resistance of the flow bus; i iso1And Io2The output currents of ESUs # 1 and ESUs # 2, respectively.
The theoretical basis of this embodiment is: according to the equivalent model shown in FIG. 2, when droop control is adopted, the DC bus voltage VbusWith load current IoLine resistance rlThe relational expression between can be written as:
vdcthe dc bus voltage rating for this example is 48V for dc bus voltage rating. According to the above formula, when the droop coefficient and the reference voltage are adjusted, the load current changes accordingly. It is by this change that droop control achieves a reasonable distribution of system load. Fig. 3(a) is an output voltage and current curve when the droop coefficient is changed, and fig. 3(b) is an output voltage and current curve when the dc bus reference voltage is changed. Therefore, as long as the SoC is associated with the reference voltage or the droop coefficient, the droop control expression can be continuously updated according to the real-time transformation of the SoC, and the adaptive droop control based on the SoC is realized.
Fig. 4 is a block diagram of a multi-energy-storage-unit SoC equalization control system according to the present invention. And (3) constructing a monotone increasing function according to the SoC real-time parameters obtained by the formula (3), and introducing the monotone increasing function into an energy storage unit adaptive droop control loop, thereby forming improved reference voltage droop expressions (1) and (2) in the invention. Wherein, the reference voltage is compared with the sampled output voltage, and the voltage outer loop control is formed through the PI controller and the amplitude limiter. And comparing the output signal of the voltage outer ring with the sampled input current, and generating a PWM (pulse width modulation) signal through a PI (proportional-integral) controller to form current inner ring control. The digital controller outputs a PWM signal to drive a switching power device of the interface converter, and the communication-free self-adaptive droop control of the energy storage unit is realized.
Referring to the equivalent model of fig. 2, it can be derived that the expressions of the output currents of the two converters in this embodiment are:
namely:
because f (SoC) is a monotone increasing function, the output current of the converter is in a direct proportion relation with the SoC value of the corresponding ESU. In the discharging process, the energy storage unit with a larger SoC provides more load current, and the energy storage unit with a smaller SoC provides smaller load current; on the contrary, during charging, because of the output current IoiIs negative, if there is SoC1>SoC2Then, Io1>Io2Can be derived as | Io1|<|Io2I.e. the larger SoC energy storage unit obtains less load current, and the smaller SoC obtains more load current. Finally, the SoC of each energy storage unit and the load current gradually tend to be consistent in the dynamic operation process, and the final control target is achieved.
The control system shown in fig. 4 can be applied to two working modes of charging and discharging of the system at the same time, so that only one controller is needed to realize dynamic operation of the energy storage system, and frequent switching of the controllers in charging and discharging operation of the energy storage system in the prior art is avoided.
As shown in fig. 4, the controller provided by the present invention does not sample the output current of each converter, which effectively reduces the design difficulty of the controller.
Fig. 5 is a waveform diagram of the output current and SoC of the converter during the dynamic charge and discharge operation of the energy storage system, fig. 5(a) is a waveform diagram of the output current, and fig. 5(b) is a waveform diagram of the SoC. When 0-10 s, the system is in a discharge mode, and the output current I corresponding to the energy storage unit with higher SoC iso1Output current I of energy storage unit larger than SoC lowero2And the current and the SoC of the two are developed towards the consistent trend; when the system has load jump in 10-20 s, each unit generates required workRedistributing output current and stably operating; recovering the load to the state of 0-10 s at 20-30 s; when the system runs for 30-50 s, mode switching occurs in the system, the energy storage unit runs in a charging mode from discharging, and the charging current value I of the energy storage unit with higher SoC iso1Charging current value I of energy storage unit smaller than SoCo2(ii) a After 50s, the system is restored to a discharge state, and the load current and the SoC are finally balanced.
In the description herein, references to the description of "one embodiment," "an example," "a specific example" or the like are intended to mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
The preferred embodiments of the invention disclosed above are intended to be illustrative only. The preferred embodiments are not intended to be exhaustive or to limit the invention to the precise embodiments disclosed. Obviously, many modifications and variations are possible in light of the above teaching. The embodiments were chosen and described in order to best explain the principles of the invention and the practical application, to thereby enable others skilled in the art to best utilize the invention. The invention is limited only by the claims and their full scope and equivalents.
Claims (4)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011289005.2A CN112436501B (en) | 2020-11-17 | 2020-11-17 | An improved balance control method for multiple energy storage units in DC microgrid |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011289005.2A CN112436501B (en) | 2020-11-17 | 2020-11-17 | An improved balance control method for multiple energy storage units in DC microgrid |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN112436501A CN112436501A (en) | 2021-03-02 |
| CN112436501B true CN112436501B (en) | 2022-04-01 |
Family
ID=74700316
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202011289005.2A Active CN112436501B (en) | 2020-11-17 | 2020-11-17 | An improved balance control method for multiple energy storage units in DC microgrid |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN112436501B (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113991636B (en) * | 2021-10-26 | 2023-09-08 | 安徽工业大学 | A nonlinear droop control method suitable for DC microgrid energy storage systems |
| CN116683552A (en) * | 2022-02-23 | 2023-09-01 | 华为数字能源技术有限公司 | Energy storage device and power supply system |
| US20230344222A1 (en) * | 2022-04-21 | 2023-10-26 | Dc Systems B.V. | Droop control in a dc operated system |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20150076910A1 (en) * | 2013-09-13 | 2015-03-19 | Acbel Polytech Inc. | Multi-mode current-allocating device |
| CN106786482A (en) * | 2017-02-07 | 2017-05-31 | 国网浙江新昌县供电公司 | The droop control method of direct-current micro-grid |
| CN108565887A (en) * | 2018-01-31 | 2018-09-21 | 湖北工业大学 | Energy storage link maintains micro-capacitance sensor busbar voltage subregion curve dynamic droop control method |
| CN109390927A (en) * | 2019-01-03 | 2019-02-26 | 燕山大学 | It is a kind of based on SOC without interconnected communication distributed energy storage droop control method |
| CN109687490A (en) * | 2018-12-14 | 2019-04-26 | 燕山大学 | The modified tone section factor S OC droop control method of distributed energy storage system |
| CN110137992A (en) * | 2019-04-26 | 2019-08-16 | 上海电力学院 | A kind of isolated island direct-current grid stable coordination progress control method |
-
2020
- 2020-11-17 CN CN202011289005.2A patent/CN112436501B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20150076910A1 (en) * | 2013-09-13 | 2015-03-19 | Acbel Polytech Inc. | Multi-mode current-allocating device |
| CN106786482A (en) * | 2017-02-07 | 2017-05-31 | 国网浙江新昌县供电公司 | The droop control method of direct-current micro-grid |
| CN108565887A (en) * | 2018-01-31 | 2018-09-21 | 湖北工业大学 | Energy storage link maintains micro-capacitance sensor busbar voltage subregion curve dynamic droop control method |
| CN109687490A (en) * | 2018-12-14 | 2019-04-26 | 燕山大学 | The modified tone section factor S OC droop control method of distributed energy storage system |
| CN109390927A (en) * | 2019-01-03 | 2019-02-26 | 燕山大学 | It is a kind of based on SOC without interconnected communication distributed energy storage droop control method |
| CN110137992A (en) * | 2019-04-26 | 2019-08-16 | 上海电力学院 | A kind of isolated island direct-current grid stable coordination progress control method |
Non-Patent Citations (4)
| Title |
|---|
| Plug-in of An Extra Power Module into Parallel-Modules with Unknown Current Sharing Strategies;Xiaodong Liu;《2019 22nd International Conference on Electrical Machines and Systems (ICEMS)》;20191205;全文 * |
| 基于ＳｏＣ均衡的直流微网储能系统负荷动态分配控制;方 炜;《电工技术》;20180531;全文 * |
| 基于精确反馈线性化的直流微电网恒功率负载系统NTSMC 稳定性研究;吴当当;《电源学报》;20200331;第18卷(第2期);全文 * |
| 直流微网储能系统SoC 均衡及电压恢复;方炜，徐朋;《电力系统及其自动化》;20191231;第41卷(第2期);全文 * |
Also Published As
| Publication number | Publication date |
|---|---|
| CN112436501A (en) | 2021-03-02 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN108574411B (en) | Dual-port stable control method and control circuit for bidirectional DC/DC power converter | |
| CN112436501B (en) | An improved balance control method for multiple energy storage units in DC microgrid | |
| CN1248396C (en) | Voltage mode high accuracy battery charger | |
| Qiu et al. | A photovoltaic generation system based on wide voltage-gain DC-DC converter and differential power processors for DC microgrids | |
| CN104467017A (en) | Multiport photovoltaic energy storage hybrid power generation system based on high frequency magnetic coupling | |
| CN105207193B (en) | A kind of direct current power spring topology and its control method | |
| CN108923410B (en) | Controller and control method for energy harvesting and an energy harvesting chip | |
| CN105656022B (en) | A kind of distribution light storage DC power-supply system non-linear differential smooth control method | |
| CN211183826U (en) | An AC-DC Microgrid Interface Converter Circuit | |
| CN113206499B (en) | DAB converter control method based on double closed-loop model prediction and PI composite control | |
| CN105915058A (en) | Electric energy transmission device based on isolated full-bridge boosting converter circuit structure and control method thereof | |
| CN106786729A (en) | A kind of microgrid unsteady flow energy storage device and its energy management method | |
| CN110572067B (en) | Island energy storage type power unit series micro-grid structure and control method | |
| CN114784898A (en) | Control and design method of self-adaptive current control circuit of parallel battery cluster | |
| CN114583952A (en) | Bidirectional direct current converter for energy storage system and control method thereof | |
| CN115347788B (en) | Non-isolated three-port converter and control method and control circuit thereof | |
| CN115664169A (en) | A quasi-peak current control method for bidirectional four-switch Buck-Boost | |
| CN101969274A (en) | Bus voltage stabilization control device | |
| CN112600432A (en) | Control method for predicting charge of LLC resonant converter | |
| CN115882466B (en) | Power quality management system of power distribution network based on AC-AC topological structure | |
| CN114944779B (en) | Isolated grid-connected three-phase converter control method based on current stress optimization | |
| CN115378276B (en) | Bidirectional power conversion topology, method and system for power battery test excitation power supply | |
| CN113488984B (en) | A secondary control method and controller for ensuring stable operation of DC microgrid | |
| CN103606934A (en) | Method for inter-phase balance control over direct current side capacitor voltage of cascade h-bridge STATCOM based on modulating wave translation | |
| CN211930274U (en) | Distributed interconnected power grid system and its multi-port flexible DC transmission device |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |