CN113644699A - Multi-converter off-grid starting operation method and device - Google Patents
Multi-converter off-grid starting operation method and device Download PDFInfo
- Publication number
- CN113644699A CN113644699A CN202110879038.0A CN202110879038A CN113644699A CN 113644699 A CN113644699 A CN 113644699A CN 202110879038 A CN202110879038 A CN 202110879038A CN 113644699 A CN113644699 A CN 113644699A
- Authority
- CN
- China
- Prior art keywords
- grid
- converter
- starting
- mode
- voltage
- 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.)
- Granted
Links
- 238000000034 method Methods 0.000 title claims abstract description 25
- 239000000126 substance Substances 0.000 claims description 2
- 238000004891 communication Methods 0.000 abstract description 4
- 238000011217 control strategy Methods 0.000 abstract description 4
- 230000003993 interaction Effects 0.000 abstract description 3
- 230000001934 delay Effects 0.000 abstract description 2
- 238000004146 energy storage Methods 0.000 description 13
- 230000001276 controlling effect Effects 0.000 description 8
- 241001672018 Cercomela melanura Species 0.000 description 5
- 230000008859 change Effects 0.000 description 5
- 238000010586 diagram Methods 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 3
- 230000008901 benefit Effects 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000006870 function Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 230000006855 networking Effects 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 230000004044 response 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
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
- H02J3/46—Controlling of the sharing of output between the generators, converters, or transformers
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/28—Arrangements for balancing of the load in a network by storage of energy
Abstract
The invention relates to a multi-converter off-grid starting operation method and device, wherein converters are in an equivalent relation, different starting delays are set for each converter, communication interaction is not needed among the converters, each converter judges and automatically identifies starting logic required to be executed through power grid voltage after the starting delay, and the starting operation control of the converters is realized according to a droop control equation. The multi-converter adopts a droop control strategy, so that on one hand, the power distribution of the multi-machine off-grid operation converter can be automatically realized according to the set droop coefficient, on the other hand, the same control algorithm is adopted at the operation bottom layers of the grid-connected mode and the off-grid mode of the converter, the algorithm switching is not involved when the grid-connected and off-grid switching is carried out, and the grid-connected and off-grid control switching is facilitated. The starting mode is adaptively selected by detecting the voltage of the power grid before each converter is started, the converter can be started according to the actual condition of the voltage of the power grid, and the converter has higher real-time performance and flexibility.
Description
Technical Field
The invention relates to the technical field of power electronic conversion control, in particular to a method and a device for starting and operating a multi-converter off-grid.
Background
With the development of power electronics technology, new energy will become the main body of power supply in the future. At present, the new energy installation of power supply side increases fast, and user side load is the diversity change, and electric power system faces a lot of challenges. The energy storage technology can play an important role in the aspects of improving the consumption proportion of renewable energy sources, ensuring the safe and stable operation of an electric power system and the like, and is a key technology for developing new energy sources on a large scale and ensuring the energy source safety. The energy storage system participates in the voltage regulation and frequency modulation of a power grid, reduces peak-valley difference, stabilizes fluctuation, improves the local consumption of novel renewable energy sources and the like, is widely researched and obtains a large number of technical achievements at present, in the field of black start application of the power grid, conventional power sources such as diesel generators or gas turbines are mostly used as black start power sources, the energy storage system has the advantages of flexible charge-discharge conversion, adjustable power factor, high response speed and the like, and the energy storage system has the characteristic of being matched with the black start requirement of the power grid, so that the energy storage system participates in the research of the black start application and has extremely important theoretical significance and practical value.
When a single energy storage unit is used as a networking unit, the energy storage converter operates and controls independently, and when the power supply is started in black, the energy storage unit operates in a V/F mode to provide voltage and frequency support for other power supplies and loads. In order to improve the system capacity, a plurality of energy storage units need to be operated in parallel, when a plurality of machines are started in parallel and are connected with an off-grid, voltage is usually established by one energy storage unit, other energy storage units are simultaneously merged, the energy storage units are regulated and controlled by an upper energy management system, and when the capacity of sudden load change in the system is larger than the capacity of a single energy storage unit, the system power is unstable due to slow regulation of the energy management system, and the stable operation of the system is influenced.
In the prior art, for an application scenario of a plurality of converters which need to be started and operated off-grid, the following two technical schemes are generally adopted:
(1) a single converter is used as a V/F source to start and operate to establish alternating voltage, other converters are incorporated into the system in a PQ mode, and the output of the converter is controlled by an upper energy management system through a power instruction, so that system power control is achieved.
(2) A central controller is added in the system, the central controller realizes a V/F control strategy and generates a current instruction and a phase angle, the converter is used as an execution unit, and current control is carried out according to the current instruction and the phase angle issued by the central controller, so that the multi-machine off-grid operation of the converter is realized.
However, both of the above solutions have certain drawbacks: (1) the system power control needs to be realized by an energy management system, and when the capacity of sudden load change in the system is larger than the capacity of a single converter, the system power is unstable due to slow regulation of the energy management system, so that the stable operation of the system is influenced. (2) In order to realize the multi-machine operation control of the converter, a central controller is added in the system, and a communication interconnection line needs to be added between the central controller and the converter, so that the capacity expansion of the system is not facilitated, the complexity of the system control is increased, and the engineering implementation is not facilitated.
Disclosure of Invention
Based on the above situation in the prior art, an object of the present invention is to provide a method and an apparatus for starting and operating a multi-converter off-grid, which automatically identify a start mode to be executed through voltage judgment, and implement multi-converter off-grid parallel operation through on-line on-grid and off-grid mode switching, so as to implement that the multi-converter jointly establishes an ac voltage to supply power to a system load.
To achieve the above object, according to one aspect of the present invention, there is provided a multi-converter off-grid startup operation method, including the steps of:
s1, receiving a starting instruction;
s2, after the preset starting delay T, judging whether the power grid voltage is smaller than an off-grid starting threshold value; if the grid voltage is less than the off-grid starting threshold, executing step S3; if the grid voltage is greater than or equal to the off-grid starting threshold, executing step S4;
s3, setting an off-grid mode operation flag to be 1, and controlling the converter to start and operate in an off-grid mode;
and S4, setting the off-grid mode operation flag to be 0, controlling the converter to start to operate in a grid-connected mode, and switching to the off-grid mode to operate after a preset time.
Furthermore, in the multi-converter, the preset starting time delay T of each converter is different, and T is more than or equal to 0.
Further, the control converter starts to operate in an off-grid mode or a grid-connected mode, and the control converter control method includes the following steps:
calculating reference values omega and V of angular frequency and direct current voltage according to a droop control equation;
inputting the reference values omega and V into a voltage loop to obtain a control command value I of a current loopdrefAnd IqrefAnd carrying out dynamic amplitude limiting on the control instruction value;
and inputting the control instruction value subjected to dynamic amplitude limiting into a current loop to obtain a control signal of the converter.
Further, the droop control equation comprises:
wherein, ω is0For reference angular frequency, V0Is a reference voltage amplitude, P0And Q0The converter outputs active power and reactive power, P and Q are given values of the active power and the reactive power, and m and n are dividedActive-frequency and reactive-voltage droop coefficients.
Further, when the converter is controlled to start running in the off-grid mode,
P＝Q＝0。
further, when the converter is controlled to start running in the grid-connected mode,
ω0＝ωgrid
V0＝Vgrid
wherein, ω isgridFor the grid angular frequency, VgridIs the grid voltage.
Further, the dynamically limiting the control command value includes:
wherein, ImaxThe maximum output current of the converter.
According to another aspect of the invention, a multi-converter off-grid starting and operating device is provided, which comprises an instruction receiving module, a starting mode judging module, an off-grid mode starting module and a grid-connected mode starting module; wherein the content of the first and second substances,
the instruction receiving module is used for receiving a starting instruction;
the starting mode judging module is used for judging whether the voltage of the power grid is smaller than an off-grid starting threshold value after a preset starting delay T and selecting different modes to start according to a judgment result;
the off-grid mode starting module is used for setting an off-grid mode operation mark to be 1 when the voltage of the power grid is smaller than an off-grid starting threshold value, and controlling the converter to start and operate in an off-grid mode;
and the grid-connected mode starting module is used for setting the off-grid mode operation flag to be 0 when the grid voltage is greater than or equal to the off-grid starting threshold, controlling the converter to start operation in a grid-connected mode, and switching to the off-grid mode operation after a preset time.
Furthermore, in the multi-converter, the preset starting time delay T of each converter is different, and T is more than or equal to 0.
Further, the off-grid mode starting module or the grid-connected mode starting module controls the converter to start and operate in an off-grid mode or a grid-connected mode, and the method comprises the following steps:
calculating reference values omega and V of angular frequency and direct current voltage according to a droop control equation;
inputting the reference values omega and V into a voltage loop to obtain a control command value I of a current loopdrefAnd IqrefAnd dynamically limiting the control command value.
In summary, the present invention provides a method and an apparatus for starting and operating off-grid of multiple converters, wherein the converters are in an equivalent relationship and each converter is provided with a different start delay, no communication interaction is required between the converters, each converter judges and automatically identifies the start logic to be executed through the voltage of the power grid after the start delay, and the start operation control of the converters is realized according to a droop control equation.
The invention has the following beneficial technical effects:
(1) the converter adopts a droop control strategy, so that on one hand, the power distribution of the multi-machine off-grid operation converter can be automatically realized according to a set droop coefficient, on the other hand, the same control algorithm is adopted at the bottom layer of grid-connected and off-grid mode operation of the converter, algorithm switching is not involved during grid-connected and off-grid switching, and the switching of grid-connected and off-grid control is facilitated.
(2) The converter adaptively selects the starting mode by detecting the voltage of the power grid before starting, executes the off-grid starting logic when the voltage of the power grid is lower than a set value, executes the grid-connected starting logic when the voltage of the power grid is higher than the set value, can be started according to the actual condition of the voltage of the power grid, and has higher real-time performance and flexibility.
(3) The setting of the starting time sequence of the converter is completed by setting different starting delay time of the converter, so that the reliable selection of the parallel-grid and off-grid operation mode of the converter is ensured.
(4) The converter is switched to the off-grid operation mode after the grid-connected mode is started, and the power distribution is automatically completed according to the set droop coefficient after the converter is switched to the off-grid mode to operate, so that the problem of power circulation caused by inconsistency of voltage angles and amplitudes when a plurality of converters are started simultaneously in an off-grid mode is solved.
Drawings
FIG. 1 is a flow chart of a multi-converter off-grid startup operation method of the present invention;
FIG. 2 is a schematic diagram of a converter droop control process;
fig. 3 is a block diagram of the multi-converter off-grid start-up operation device according to the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in further detail with reference to the accompanying drawings in conjunction with the following detailed description. It should be understood that the description is intended to be exemplary only, and is not intended to limit the scope of the present invention. Moreover, in the following description, descriptions of well-known structures and techniques are omitted so as to not unnecessarily obscure the concepts of the present invention.
The technical solution of the present invention will be described in detail below with reference to the accompanying drawings. According to an embodiment of the present invention, a multi-converter off-grid start operation method is provided, a flowchart of the method is shown in fig. 1, and the method provided in this embodiment may be implemented by, for example, a controller or other components with control functions provided on each converter, which is not specifically limited herein. The method comprises the following steps:
and S1, receiving a starting instruction. The converter receives a starting instruction sent by an upper energy management system, for example, so as to start off the grid.
S2, after the preset starting delay T, judging whether the power grid voltage is smaller than an off-grid starting threshold value; if the grid voltage is less than the off-grid starting threshold, executing step S3; if the grid voltage is greater than or equal to the off-grid starting threshold, step S4 is executed. The off-grid start threshold may be set to 0.3U, for examplenWherein U isnIs an alternating current rated voltage.
Different starting time delays T are preset for each converter in the multi-converter, wherein T is larger than or equal to 0, so that each converter can execute corresponding starting logic according to the corresponding starting time delay of each converter. For example, a converter in which the start-up delay is set to 0 will execute off-grid start-up logic due to the absence of voltage at this time, providing voltage and frequency support for the system load. After the first converter operates in the off-grid mode to establish the grid voltage, and the subsequent converters detect that the grid voltage is greater than or equal to the off-grid starting threshold value, the off-grid mode operation mark position is 0 to execute the grid-connected operation mode starting.
And S3, setting an off-grid mode operation flag to be 1, and controlling the converter to start to operate in an off-grid mode.
And S4, setting the off-grid mode operation flag to be 0, controlling the converter to start to operate in the grid-connected mode, and switching to the off-grid mode operation after a preset time, wherein the preset time can be set to be 3S for example. After the converter is switched to the off-grid mode to operate, the power distribution is automatically completed according to respective droop coefficients, and therefore the parallel off-grid black start operation of the converter is achieved.
The converter is controlled to start and operate in an off-grid mode or a grid-connected mode, and both the converter and the converter are controlled in a droop control mode, a schematic control process diagram of droop control, a voltage loop and a current loop is shown in fig. 2, and the droop control, the voltage loop and the current loop can be specifically controlled according to the following steps:
calculating reference values omega and V of angular frequency and direct current voltage according to a droop control equation; the droop control equation comprises: v is V0+n(Q-Q0)
Wherein, ω is0For reference angular frequency, V0Is a reference voltage amplitude, P0And Q0The converter outputs active power and reactive power, and can be obtained by calculating by collecting three-phase direct current voltage and current of the converter. P and Q are given values of active power and reactive power, and m and n are respectively an active-frequency and a reactive-voltage droop coefficient. The droop coefficient can be determined according to the principle that when the power is changed into a rated value, the corresponding frequency change is ensured in the frequency range of normal operation of the equipment, and if the power is changed by 100kW and the corresponding frequency change is 1Hz, the droop coefficient sagsThe coefficient m is then 0.01 and n can be calculated in the same way.
When the converter is controlled to start to operate in an off-grid mode, P is Q is 0, and the reference angular frequency and the reference voltage amplitude are set reference values omega at the momentrefAnd Vref。
When the converter is controlled to start running in a grid-connected mode, P and Q are preset values,
ω0＝ωgrid
V0＝Vgrid
wherein, ω isgridFor the grid angular frequency, VgridIs the grid voltage.
Inputting the reference values omega and V into a three-phase voltage generation module to generate three-phase reference voltage, carrying out coordinate transformation on the three-phase reference voltage and the acquired actual three-phase voltage to obtain a reference set value and an actual feedback value under a dq coordinate system, and then carrying out closed-loop control to obtain a control instruction value I of a current loopdrefAnd IqrefIn order to ensure the safe and stable operation of the converter, the output current needs to be subjected to amplitude limiting, and the control instruction value is subjected to dynamic amplitude limiting, wherein the dynamic amplitude limiting can be performed according to the following formula:
wherein, ImaxThe maximum output current of the converter. The current control instruction value is controlled within the range of-1.1 pu to 1.1pu through the formula.
The control instruction value after dynamic amplitude limiting is input to the current loop, and the d-axis component and the q-axis component of the alternating current are input to the current loop at the same time, so as to obtain the PWM control signal of the converter according to the current control module shown in fig. 2, that is, the control logic of the current loop.
According to another embodiment of the present invention, a block diagram of a multi-converter off-grid starting and operating apparatus is provided as shown in fig. 3, and the apparatus includes a command receiving module, a starting mode determining module, an off-grid mode starting module, and a grid-connected mode starting module.
The instruction receiving module is used for receiving a starting instruction.
And the starting mode judging module is used for judging whether the voltage of the power grid is smaller than an off-grid starting threshold value after a preset starting delay T and selecting different modes to start according to a judgment result. In the multi-converter, the preset starting time delay T of each converter is different, and T is more than or equal to 0.
And the off-grid mode starting module is used for setting an off-grid mode operation mark 1 when the voltage of the power grid is smaller than an off-grid starting threshold value, and controlling the converter to start and operate in an off-grid mode.
The grid-connected mode starting module is used for setting the off-grid mode operation flag to be 0 when the grid voltage is greater than or equal to the off-grid starting threshold, controlling the converter to start operation in the grid-connected mode, and switching to the off-grid mode operation after a preset time, wherein the preset time can be set to be 3s for example
In summary, the present invention relates to a method and an apparatus for starting and operating off-grid of multiple converters, wherein the converters are in an equivalent relationship and each converter is provided with a different start delay, no communication interaction is required between the converters, each converter judges and automatically identifies a start logic to be executed through a grid voltage after the start delay, and the start operation control of the converter is realized according to a droop control equation. The multi-converter adopts a droop control strategy, so that on one hand, the power distribution of the multi-machine off-grid operation converter can be automatically realized according to the set droop coefficient, on the other hand, the same control algorithm is adopted at the operation bottom layers of the grid-connected mode and the off-grid mode of the converter, the algorithm switching is not involved when the grid-connected and off-grid switching is carried out, and the grid-connected and off-grid control switching is facilitated. Before each converter is started, a starting mode is adaptively selected by detecting the voltage of a power grid, when the voltage of the power grid is lower than a set value, the converter executes an off-grid starting logic, when the voltage of the power grid is higher than the set value, the converter executes a grid-connected starting logic, and the converter can be started according to the actual condition of the voltage of the power grid, so that the converter has higher instantaneity and flexibility. The setting of the starting time sequence of the converter is completed by setting different starting delay time of the converter, so that the reliable selection of the parallel-grid and off-grid operation mode of the converter is ensured. The converter is switched to the off-grid operation mode after the grid-connected mode is started, and the power distribution is automatically completed according to the set droop coefficient after the converter is switched to the off-grid mode to operate, so that the problem of power circulation caused by inconsistency of voltage angles and amplitudes when a plurality of converters are started simultaneously in an off-grid mode is solved.
It is to be understood that the above-described embodiments of the present invention are merely illustrative of or explaining the principles of the invention and are not to be construed as limiting the invention. Therefore, any modification, equivalent replacement, improvement and the like made without departing from the spirit and scope of the present invention should be included in the protection scope of the present invention. Further, it is intended that the appended claims cover all such variations and modifications as fall within the scope and boundaries of the appended claims or the equivalents of such scope and boundaries.
Claims (10)
1. A multi-converter off-grid starting operation method is characterized by comprising the following steps:
s1, receiving a starting instruction;
s2, after the preset starting delay T, judging whether the power grid voltage is smaller than an off-grid starting threshold value; if the grid voltage is less than the off-grid starting threshold, executing step S3; if the grid voltage is greater than or equal to the off-grid starting threshold, executing step S4;
s3, setting an off-grid mode operation flag to be 1, and controlling the converter to start and operate in an off-grid mode;
and S4, setting the off-grid mode operation flag to be 0, controlling the converter to start to operate in a grid-connected mode, and switching to the off-grid mode to operate after a preset time.
2. The method according to claim 1, wherein the preset starting time delay T of each converter in the multi-converter is different and T is greater than or equal to 0.
3. The method of claim 1, wherein controlling the converter to start operating in an off-grid mode or a grid-connected mode comprises:
calculating reference values omega and V of angular frequency and direct current voltage according to a droop control equation;
inputting the reference values omega and V into a voltage loop to obtain a control command value I of a current loopdrefAnd IqrefAnd carrying out dynamic amplitude limiting on the control instruction value;
and inputting the control instruction value subjected to dynamic amplitude limiting into a current loop to obtain a control signal of the converter.
4. The method of claim 3, wherein the droop control equation comprises:
wherein, ω is0For reference angular frequency, V0Is a reference voltage amplitude, P0And Q0The converter outputs active power and reactive power, P and Q are given values of the active power and the reactive power, and m and n are an active-frequency and a reactive-voltage droop coefficient respectively.
5. The method of claim 4, wherein when the converter is controlled to start operation in an off-grid mode,
P＝Q＝0。
6. the method of claim 4, wherein when the converter is controlled to start operation in grid-tie mode,
ω0＝ωgrid
V0＝Vgrid
wherein, ω isgridFor the grid angular frequency, VgridIs the grid voltage.
7. The method of claim 4, wherein said dynamically clipping the control command value comprises:
wherein, ImaxThe maximum output current of the converter.
8. A multi-converter off-grid starting and operating device is characterized by comprising an instruction receiving module, a starting mode judging module, an off-grid mode starting module and a grid-connected mode starting module; wherein the content of the first and second substances,
the instruction receiving module is used for receiving a starting instruction;
the starting mode judging module is used for judging whether the voltage of the power grid is smaller than an off-grid starting threshold value after a preset starting delay T and selecting different modes to start according to a judgment result;
the off-grid mode starting module is used for setting an off-grid mode operation mark to be 1 when the voltage of the power grid is smaller than an off-grid starting threshold value, and controlling the converter to start and operate in an off-grid mode;
and the grid-connected mode starting module is used for setting the off-grid mode operation flag to be 0 when the grid voltage is greater than or equal to the off-grid starting threshold, controlling the converter to start operation in a grid-connected mode, and switching to the off-grid mode operation after a preset time.
9. The device according to claim 8, wherein in the multi-converter, the preset starting time delay T of each converter is different, and T is more than or equal to 0.
10. The apparatus of claim 8, wherein the off-grid mode starting module or the grid-connected mode starting module controls the converter to start and operate in an off-grid mode or a grid-connected mode, and comprises:
calculating reference values omega and V of angular frequency and direct current voltage according to a droop control equation;
inputting the reference values omega and V into a voltage loop to obtain a control command value I of a current loopdrefAnd IqrefAnd dynamically limiting the control command value.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110879038.0A CN113644699B (en) | 2021-08-02 | 2021-08-02 | Multi-converter off-grid starting operation method and device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110879038.0A CN113644699B (en) | 2021-08-02 | 2021-08-02 | Multi-converter off-grid starting operation method and device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN113644699A true CN113644699A (en) | 2021-11-12 |
| CN113644699B CN113644699B (en) | 2024-04-05 |
Family
ID=78419234
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110879038.0A Active CN113644699B (en) | 2021-08-02 | 2021-08-02 | Multi-converter off-grid starting operation method and device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN113644699B (en) |
Citations (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102185333A (en) * | 2011-04-19 | 2011-09-14 | 河南电力试验研究院 | Method for realizing on-grid and off-grid dual-mode running of dual-directional converter in micro-grid |
| CN103560535A (en) * | 2013-11-20 | 2014-02-05 | 北京四方继保自动化股份有限公司 | Micro-grid operation mode seamless switching method based on energy storage current transformer |
| WO2015149619A1 (en) * | 2014-04-01 | 2015-10-08 | 阳光电源股份有限公司 | Black-start method, energy management system and off-grid light storage micro-grid with shared alternating-current bus |
| CN109494776A (en) * | 2018-11-30 | 2019-03-19 | 北京科诺伟业科技股份有限公司 | The grid-connected bidirectional converter of energy-storage system and off-network double mode operation method |
| CN109921470A (en) * | 2019-04-18 | 2019-06-21 | 尚特杰电力科技有限公司 | A kind of micro-capacitance sensor and its off-network switching method of the disturbance of defence bulk power grid |
| CN110707742A (en) * | 2019-09-10 | 2020-01-17 | 西安许继电力电子技术有限公司 | Multi-converter parallel off-grid starting control system and starting method |
| CN111181195A (en) * | 2020-01-13 | 2020-05-19 | 合肥阳光新能源科技有限公司 | Light storage micro-grid system and self-starting method thereof |
| CN111864779A (en) * | 2020-07-29 | 2020-10-30 | 天津电气科学研究院有限公司 | Energy storage converter system with self-adaptive function and off-grid starting method thereof |
| CN112436545A (en) * | 2020-11-02 | 2021-03-02 | 华能通榆团结风力发电有限公司 | Control method for improving micro-grid operation stability under island/grid-connected dual mode |
| CN112564455A (en) * | 2020-11-13 | 2021-03-26 | 国网新源张家口风光储示范电站有限公司 | Method and system for controlling parallel off-grid operation of multiple energy storage converters |
| US20210143671A1 (en) * | 2018-10-30 | 2021-05-13 | Crrc Qingdao Sifang Rolling Stock Research Institute Co., Ltd. | Synchronous soft-start networking control strategy for parallel auxiliary converters of emu |
-
2021
- 2021-08-02 CN CN202110879038.0A patent/CN113644699B/en active Active
Patent Citations (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102185333A (en) * | 2011-04-19 | 2011-09-14 | 河南电力试验研究院 | Method for realizing on-grid and off-grid dual-mode running of dual-directional converter in micro-grid |
| EP2632011A1 (en) * | 2011-04-19 | 2013-08-28 | Henan Electric Power Corporation Electric Power Science Research Institute | Method for implementing on/off-grid dual-mode operation of bidirectional converter in micro power grid |
| CN103560535A (en) * | 2013-11-20 | 2014-02-05 | 北京四方继保自动化股份有限公司 | Micro-grid operation mode seamless switching method based on energy storage current transformer |
| WO2015149619A1 (en) * | 2014-04-01 | 2015-10-08 | 阳光电源股份有限公司 | Black-start method, energy management system and off-grid light storage micro-grid with shared alternating-current bus |
| US20210143671A1 (en) * | 2018-10-30 | 2021-05-13 | Crrc Qingdao Sifang Rolling Stock Research Institute Co., Ltd. | Synchronous soft-start networking control strategy for parallel auxiliary converters of emu |
| CN109494776A (en) * | 2018-11-30 | 2019-03-19 | 北京科诺伟业科技股份有限公司 | The grid-connected bidirectional converter of energy-storage system and off-network double mode operation method |
| CN109921470A (en) * | 2019-04-18 | 2019-06-21 | 尚特杰电力科技有限公司 | A kind of micro-capacitance sensor and its off-network switching method of the disturbance of defence bulk power grid |
| CN110707742A (en) * | 2019-09-10 | 2020-01-17 | 西安许继电力电子技术有限公司 | Multi-converter parallel off-grid starting control system and starting method |
| CN111181195A (en) * | 2020-01-13 | 2020-05-19 | 合肥阳光新能源科技有限公司 | Light storage micro-grid system and self-starting method thereof |
| CN111864779A (en) * | 2020-07-29 | 2020-10-30 | 天津电气科学研究院有限公司 | Energy storage converter system with self-adaptive function and off-grid starting method thereof |
| CN112436545A (en) * | 2020-11-02 | 2021-03-02 | 华能通榆团结风力发电有限公司 | Control method for improving micro-grid operation stability under island/grid-connected dual mode |
| CN112564455A (en) * | 2020-11-13 | 2021-03-26 | 国网新源张家口风光储示范电站有限公司 | Method and system for controlling parallel off-grid operation of multiple energy storage converters |
Non-Patent Citations (3)
| Title |
|---|
| 杨涛等: "储能在光储微电网中的应用研究", 电力电子技术, pages 72 - 77 * |
| 王文彬;: "光伏电站储能方案设计案例分析", 国网技术学院学报, no. 04 * |
| 黄杏;金新民;: "微网用分布式电源变流器下垂特性控制策略", 电工技术学报, no. 08, pages 93 - 100 * |
Also Published As
| Publication number | Publication date |
|---|---|
| CN113644699B (en) | 2024-04-05 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| Wen et al. | Power coupling mechanism analysis and improved decoupling control for virtual synchronous generator | |
| CN101534014B (en) | Power conversion device | |
| CN108448607B (en) | Grid-connected and off-grid switching method and device for micro-grid battery energy storage system | |
| Peng et al. | Performance improvement of the unbalanced voltage compensation in islanded microgrid based on small-signal analysis | |
| CN109617082B (en) | Transient stability control method for inhibiting voltage frequency of micro-grid from exceeding limit | |
| Vittorias et al. | A bidirectional battery charger for electric vehicles with V2G and V2H capability and active and reactive power control | |
| Bašić et al. | Energy efficient control of a stand-alone wind energy conversion system with AC current harmonics compensation | |
| Karthikeyan et al. | Hybrid, open-loop excitation system for a wind turbine-driven stand-alone induction generator | |
| Saleh | Testing a unit commitment based controller for grid-connected PMG-based WECSs with generator-charged battery units | |
| US10468977B2 (en) | Power controller and power control method | |
| Guazzelli et al. | Dual predictive current control of grid connected nine-switch converter applied to induction generator | |
| Li et al. | A grid frequency support control strategy of the three phase cascaded H-bridge based photovoltaic generation system | |
| Hua et al. | Research on Grid-connected control and simulation of microgrid inverter based on VSG | |
| Rezkallah et al. | Control of small-scale wind/diesel/battery hybrid standalone power generation system based on fixed speed generators for remote areas | |
| CN113644699A (en) | Multi-converter off-grid starting operation method and device | |
| Song et al. | A novel DC-link voltage control for small-scale grid-connected wind energy conversion system | |
| Bubalo et al. | Optimized isolated operation of a WECS-powered microgrid with a battery-assisted qZSI | |
| US11621666B2 (en) | Hybrid solar/motor drive inverter | |
| CN112600255B (en) | Energy-storage-free photovoltaic voltage type control method, storage medium and computing device | |
| Zhang et al. | Analysis and control of energy storage systems in microgrid | |
| Chilipi et al. | A new voltage and frequency controller for standalone parallel operated self excited induction generators | |
| CN113472005A (en) | Ship shore power system with distributed power supply and working method thereof | |
| Li et al. | A cost-effective regenerative braking system for electric vehicles driven by induction machine | |
| CN110707975A (en) | Control method of multiphase belt suspension capacitor motor drive topology | |
| Dubuisson et al. | Implementation of a new control for hybrid wind-diesel for water treatment standalone system |
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 |