CN112332449A - Microgrid grid-connected adjusting method - Google Patents
Microgrid grid-connected adjusting method Download PDFInfo
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- CN112332449A CN112332449A CN202011091382.5A CN202011091382A CN112332449A CN 112332449 A CN112332449 A CN 112332449A CN 202011091382 A CN202011091382 A CN 202011091382A CN 112332449 A CN112332449 A CN 112332449A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
- H02J3/381—Dispersed generators
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/12—Circuit arrangements for ac mains or ac distribution networks for adjusting voltage in ac networks by changing a characteristic of the network load
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/28—Arrangements for balancing of the load in a network by storage of energy
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/28—Arrangements for balancing of the load in a network by storage of energy
- H02J3/32—Arrangements for balancing of the load in a network by storage of energy using batteries with converting means
Abstract
The invention provides a microgrid grid-connected adjusting method, which comprises the following steps: a voltage division module is arranged between the microgrid power supply and the microgrid alternating-current bus, the voltage division module comprises a microgrid switch and a voltage division resistor which is connected with the microgrid switch in parallel and has an adjustable resistance value, and the microgrid switch is respectively connected with the microgrid power supply and the microgrid alternating-current bus; an energy storage module is arranged, a charging end of the energy storage module is connected with a microgrid power supply, and a discharging end of the energy storage module is connected with a microgrid alternating current bus; during grid connection adjustment, the working states of the voltage dividing module and the energy storage module are adjusted according to the difference value between the main grid alternating-current bus voltage and the micro-grid alternating-current bus voltage, and the grid connection point switch is closed until the main grid alternating-current bus voltage is consistent with the micro-grid alternating-current bus voltage. According to the invention, the voltage regulation range of the microgrid alternating-current bus is expanded, and the flexibility and reliability of the voltage regulation of the microgrid alternating-current bus are ensured. Before grid connection, the voltage of the micro-grid alternating-current bus is consistent with that of the main grid alternating-current bus, and voltage disturbance on the main grid alternating-current bus during grid connection is reduced.
Description
Technical Field
The invention relates to the technical field of micro-grids, in particular to a micro-grid connection adjusting method.
Background
At present, in the micro-grid regulation and control, in order to improve the utilization efficiency of a distributed power supply, most micro-grids are provided with energy storage batteries, so that when the voltage of a micro-grid bus is too low, the micro-grid bus is boosted by discharging through the energy storage batteries. However, there is still no good way to deal with the situation where the voltage of the microgrid bus is too high. And the influence on the grid connection of the microgrid is larger due to overhigh bus voltage of the microgrid.
Disclosure of Invention
Based on the technical problems in the background art, the invention provides a micro-grid connection adjusting method.
The invention provides a microgrid grid-connected adjusting method, which comprises the following steps:
s1, arranging a voltage division module between the microgrid power supply and the microgrid alternating-current bus, wherein the voltage division module comprises a microgrid switch and a voltage division resistor which is connected with the microgrid switch in parallel and has an adjustable resistance value, and the microgrid switch is respectively connected with the microgrid power supply and the microgrid alternating-current bus;
s2, arranging an energy storage module, wherein a charging end of the energy storage module is connected with a microgrid power supply, and a discharging end of the energy storage module is connected with a microgrid alternating current bus;
and S3, during grid connection adjustment, adjusting the working states of the voltage dividing module and the energy storage module according to the difference value between the main grid alternating current bus voltage and the micro-grid alternating current bus voltage, and closing the grid connection point switch until the main grid alternating current bus voltage is consistent with the micro-grid alternating current bus voltage.
Preferably, in step S3, the microgrid controller acquires a microgrid alternating current bus voltage, and compares the microgrid alternating current bus voltage with a main grid alternating current bus voltage issued by the main grid controller; and the microgrid controller adjusts the working states of the voltage division module and the energy storage module according to the comparison result.
Preferably, the voltage division module comprises a first working state and a second working state, wherein in the first working state, the microgrid switch is closed, and the voltage division resistor is disconnected; and in a second working state, the microgrid switch is switched off, and the microgrid power supply supplies power to the microgrid alternating-current bus through the voltage dividing resistor.
Preferably, the voltage dividing resistor is a sliding resistor; the microgrid controller is connected with the voltage dividing resistor.
Preferably, the voltage dividing resistor is formed by connecting a plurality of equivalent resistors in series, each equivalent resistor is connected with a short-circuit switch in parallel, the microgrid controller is connected with each short-circuit switch, and the resistance value of the voltage dividing resistor is adjusted by adjusting the closing number of the short-circuit switches.
Preferably, the method further comprises step S4: when the grid-connected point switch is closed, the voltage division module is adjusted to be in a first working state.
Preferably, step S4 specifically includes: when the grid-connected point switch is closed, whether the voltage dividing module is in the first working state is detected, if not, the voltage of the voltage dividing resistor is reduced for multiple times until the resistance value of the voltage dividing resistor is 0, and then the voltage dividing module is switched to the first working state.
Preferably, the method further comprises step S0: presetting a plurality of microgrid boosting actions and a plurality of microgrid voltage reducing actions;
the plurality of microgrid boosting actions comprises sequentially arranged: the resistance value of the voltage division module is reduced, the microgrid power supply stops charging the energy storage module, and the energy storage module supplies power to the microgrid alternating-current bus;
the plurality of microgrid voltage reduction actions comprises the following steps in sequence: the energy storage module stops supplying power to the microgrid alternating-current bus, the microgrid power supply charges the energy storage module, and the resistance value of the voltage division module is increased;
step S3 specifically includes the following steps:
s31, comparing the main grid alternating current bus voltage with the micro grid alternating current bus voltage;
s32, when the main grid alternating-current bus voltage is larger than the microgrid alternating-current bus voltage, sequentially executing a plurality of microgrid boosting actions according to the current microgrid working state until the microgrid alternating-current bus voltage is consistent with the main grid alternating-current bus voltage, and then closing a grid-connected point switch;
s33, when the main grid alternating-current bus voltage is smaller than the microgrid alternating-current bus voltage, sequentially executing a plurality of microgrid voltage reduction actions according to the current microgrid working state until the microgrid alternating-current bus voltage is consistent with the main grid alternating-current bus voltage, and then closing a grid-connected point switch;
and S34, when the main grid alternating current bus voltage is equal to the microgrid alternating current bus voltage, closing the grid-connected point switch.
Preferably, in step S2, the energy storage module is a battery or a super capacitor.
According to the micro-grid connection adjusting method, when a micro-grid power supply supplies power to a micro-grid alternating current bus through a micro-grid switch, the maximum utilization rate of the power supply of the micro-grid power supply can be realized; when the microgrid power supply supplies power to the microgrid alternating-current bus through the voltage dividing resistors, the voltage of the microgrid alternating-current bus can be effectively reduced through voltage dividing of the voltage dividing resistors, and therefore voltage reduction adjustment of the microgrid alternating-current bus is achieved.
According to the invention, the double-power supply of the microgrid alternating-current bus can be realized by discharging through the energy storage module, so that the voltage of the microgrid alternating-current bus is effectively increased, and the boosting regulation of the microgrid alternating-current bus is realized.
Therefore, the voltage adjusting range of the microgrid alternating-current bus can be expanded through the matching of the voltage dividing module and the energy storage module, and the flexibility and reliability of voltage adjustment of the microgrid alternating-current bus are guaranteed. Therefore, the voltage of the microgrid alternating-current bus is adjusted through the voltage of the microgrid alternating-current bus, the voltage of the microgrid alternating-current bus is consistent with the voltage of the main grid alternating-current bus before grid connection, and voltage disturbance on the main grid alternating-current bus during grid connection is reduced.
Drawings
Fig. 1 is a flowchart of a microgrid grid-connected adjustment method provided by the invention;
FIG. 2 is a flow chart of another microgrid grid-connected adjustment method provided by the invention;
fig. 3 is a microgrid alternating current bus boosting flow chart;
fig. 4 is a microgrid alternating current bus voltage reduction flow chart.
Detailed Description
Referring to fig. 1, the method for adjusting the grid connection of the microgrid, provided by the invention, comprises the following steps.
S1, a voltage division module is arranged between the microgrid power supply and the microgrid alternating-current bus, the voltage division module comprises a microgrid switch and a voltage division resistor which is connected with the microgrid switch in parallel and has an adjustable resistance value, and the microgrid switch is connected with the microgrid power supply and the microgrid alternating-current bus respectively.
Therefore, in the embodiment, when the microgrid power supply supplies power to the microgrid alternating-current bus through the microgrid switch, the maximum power supply utilization rate of the microgrid power supply can be realized; when the microgrid power supply supplies power to the microgrid alternating-current bus through the voltage dividing resistors, the voltage of the microgrid alternating-current bus can be effectively reduced through voltage dividing of the voltage dividing resistors, and therefore voltage reduction adjustment of the microgrid alternating-current bus is achieved.
And S2, an energy storage module is arranged, the charging end of the energy storage module is connected with the microgrid power supply, and the discharging end of the energy storage module is connected with the microgrid alternating current bus.
Therefore, in the embodiment, the double-power supply of the microgrid alternating-current bus can be realized by discharging through the energy storage module, so that the voltage of the microgrid alternating-current bus is effectively improved, and the boosting regulation of the microgrid alternating-current bus is realized.
Therefore, the voltage adjusting range of the microgrid alternating-current bus can be expanded through the matching of the voltage dividing module and the energy storage module, and the flexibility and reliability of voltage adjustment of the microgrid alternating-current bus are guaranteed.
In addition, in the embodiment, the energy storage module is directly charged through the microgrid power supply, so that the charging efficiency of the microgrid power supply for the energy storage module is improved, and the condition that the energy storage module is charged and disturbs the voltage of the microgrid alternating-current bus is avoided, so that the voltage stability of the microgrid alternating-current bus is further ensured.
In specific implementation, the energy storage module adopts a storage battery or a super capacitor.
And S3, during grid connection adjustment, adjusting the working states of the voltage dividing module and the energy storage module according to the difference value between the main grid alternating current bus voltage and the micro-grid alternating current bus voltage, and closing the grid connection point switch until the main grid alternating current bus voltage is consistent with the micro-grid alternating current bus voltage.
Specifically, in step S3, during grid-connected regulation, the microgrid controller acquires a microgrid ac bus voltage, and compares the microgrid ac bus voltage with a main grid ac bus voltage issued by the main grid controller; and the microgrid controller adjusts the working states of the voltage division module and the energy storage module according to the comparison result. Specifically, the microgrid controller acquires the voltage of the microgrid alternating-current bus through a voltage sensor arranged on the microgrid alternating-current bus; when the voltage of the microgrid alternating-current bus is greater than the voltage of the main grid alternating-current bus, the microgrid controller can control the voltage dividing module to increase the resistance value so as to reduce the voltage of the microgrid alternating-current bus; when the voltage of the microgrid alternating-current bus is smaller than the voltage of the main grid alternating-current bus, the microgrid controller can control the energy storage module to supply power simultaneously so as to improve the voltage of the microgrid alternating-current bus.
In the embodiment, the voltage division module comprises a first working state and a second working state, wherein in the first working state, the microgrid switch is closed, and the voltage division resistor is disconnected; and in a second working state, the microgrid switch is switched off, and the microgrid power supply supplies power to the microgrid alternating-current bus through the voltage dividing resistor. Thus, in the present embodiment, when the voltage dividing module is in the first working state, the resistance value of the voltage dividing module is infinitely close to 0, and the resistance value of the voltage dividing module can be decreased by decreasing the resistance value of the voltage dividing module in the second working state and switching the second working state to the first working state; similarly, the resistance value of the voltage division module can be increased by switching the voltage division module from the first working state to the second working state and increasing the resistance value under the second working state.
In this embodiment, the voltage dividing resistor is a sliding resistor; the microgrid controller is connected with the divider resistor so as to control the divider resistor to slide and realize the resistance adjustment of the divider resistor. In specific implementation, the sliding control end of the divider resistor can be connected with a driving mechanism for driving the divider resistor to slide, such as a motor, an air cylinder and the like; therefore, the microgrid controller can drive the sliding control end to slide through the driving mechanism, and therefore resistance value adjustment of the divider resistor is achieved.
In this embodiment, it may be further configured that the voltage dividing resistor is formed by serially connecting a plurality of equivalent resistors, each equivalent resistor is connected in parallel with a short-circuit switch, the microgrid controller is connected with each short-circuit switch, and the resistance value of the voltage dividing resistor is adjusted by adjusting the number of closed short-circuit switches.
Specifically, the present embodiment further includes step S0: a plurality of microgrid boosting actions and a plurality of microgrid voltage reducing actions are preset.
The plurality of microgrid boosting actions comprises sequentially arranged: the resistance value of the voltage division module is reduced, the microgrid power supply stops charging the energy storage module, and the energy storage module supplies power to the microgrid alternating-current bus.
The plurality of microgrid voltage reduction actions comprises the following steps in sequence: the energy storage module stops supplying power to the microgrid alternating-current bus, the microgrid power supply charges the energy storage module, and the resistance value of the voltage division module is increased.
Step S3 specifically includes the following steps:
s31, comparing the main grid alternating current bus voltage with the micro grid alternating current bus voltage;
and S32, when the main grid alternating-current bus voltage is larger than the microgrid alternating-current bus voltage, sequentially executing a plurality of microgrid boosting actions according to the current microgrid working state until the microgrid alternating-current bus voltage is consistent with the main grid alternating-current bus voltage, and then closing the grid-connected point switch.
Specifically, in the present embodiment, when a plurality of microgrid boosting operations are sequentially executed, it is first detected whether a condition of the microgrid boosting operation to be executed is satisfied, and if so, the microgrid boosting operation to be executed is executed; and otherwise, skipping the microgrid boosting action to be executed currently, and taking the next microgrid boosting action as the microgrid boosting action to be executed. Specifically, the execution of the plurality of microgrid boosting actions may refer to fig. 3.
And S33, when the main grid alternating-current bus voltage is smaller than the microgrid alternating-current bus voltage, sequentially executing a plurality of microgrid voltage reduction actions according to the current microgrid working state until the microgrid alternating-current bus voltage is consistent with the main grid alternating-current bus voltage, and then closing the grid-connected point switch.
In the embodiment, when a plurality of microgrid voltage reduction actions are sequentially executed, whether the conditions of the microgrid voltage reduction actions to be executed are met is detected, and if yes, the microgrid voltage reduction actions to be executed are executed; and otherwise, skipping the microgrid voltage reduction action to be executed currently, and taking the next microgrid voltage reduction action as the microgrid voltage reduction action to be executed. In particular, the multiple microgrid voltage reduction actions may be performed with reference to fig. 4.
And S34, when the main grid alternating current bus voltage is equal to the microgrid alternating current bus voltage, closing the grid-connected point switch.
Specifically, in this embodiment, when the microgrid ac bus voltage is the same as the main grid ac bus voltage, the main grid controller controls the grid-connected point switch to be closed. Therefore, the closing of the grid-connected point switch and the issuing of the main network control instruction are both executed by the main network controller, so that the timely response of the grid-connected point switch operation is favorably improved, and the grid-connected efficiency is improved.
The microgrid grid-connection adjustment method in the present embodiment further includes step S4: when the grid-connected point switch is closed, the voltage division module is adjusted to be in a first working state. Therefore, after the micro-grid is connected to the power grid, the main grid controller can be used for detecting the parameters of the main grid in real time and comprehensively adjusting the parameters by combining the distributed power supply in the main grid, so that the electric energy output by the micro-grid power supply can be distributed in a centralized manner. Therefore, the voltage division module is adjusted to be in the first working state, the electric energy waste of the micro-grid power supply is avoided, and meanwhile, the distributable electric energy of the main grid is enabled to be more sufficient.
In this embodiment, step S4 specifically includes: when the grid-connected point switch is closed, whether the voltage dividing module is in the first working state is detected, if not, the voltage of the voltage dividing resistor is reduced for multiple times until the resistance value of the voltage dividing resistor is 0, and then the voltage dividing module is switched to the first working state.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and the technical solutions and the inventive concepts thereof according to the present invention are equivalent to or changed within the technical scope of the present invention.
Claims (9)
1. A microgrid grid-connected adjusting method is characterized by comprising the following steps:
s1, arranging a voltage division module between the microgrid power supply and the microgrid alternating-current bus, wherein the voltage division module comprises a microgrid switch and a voltage division resistor which is connected with the microgrid switch in parallel and has an adjustable resistance value, and the microgrid switch is respectively connected with the microgrid power supply and the microgrid alternating-current bus;
s2, arranging an energy storage module, wherein a charging end of the energy storage module is connected with a microgrid power supply, and a discharging end of the energy storage module is connected with a microgrid alternating current bus;
and S3, during grid connection adjustment, adjusting the working states of the voltage dividing module and the energy storage module according to the difference value between the main grid alternating current bus voltage and the micro-grid alternating current bus voltage, and closing the grid connection point switch until the main grid alternating current bus voltage is consistent with the micro-grid alternating current bus voltage.
2. The microgrid grid-connection adjusting method according to claim 1, wherein in step S3, the microgrid controller acquires a microgrid alternating-current bus voltage and compares the microgrid alternating-current bus voltage with a main grid alternating-current bus voltage issued by the main grid controller; and the microgrid controller adjusts the working states of the voltage division module and the energy storage module according to the comparison result.
3. The microgrid grid-connection adjustment method according to claim 2, characterized in that the voltage division module comprises a first working state and a second working state, wherein in the first working state, a microgrid switch is closed, and a voltage division resistor is disconnected; and in a second working state, the microgrid switch is switched off, and the microgrid power supply supplies power to the microgrid alternating-current bus through the voltage dividing resistor.
4. The microgrid grid-connection adjustment method according to claim 3, characterized in that a voltage dividing resistor adopts a sliding resistor; the microgrid controller is connected with the voltage dividing resistor.
5. The microgrid grid-connection adjustment method according to claim 3, characterized in that the voltage dividing resistor is composed of a plurality of equivalent resistors connected in series, each equivalent resistor is connected with a short-circuit switch in parallel, the microgrid controller is connected with each short-circuit switch, and the resistance value of the voltage dividing resistor is adjusted by adjusting the number of closed short-circuit switches.
6. The microgrid grid-connection adjustment method according to claim 3, characterized by further comprising the step S4: when the grid-connected point switch is closed, the voltage division module is adjusted to be in a first working state.
7. The microgrid grid-connection adjustment method according to claim 6, wherein the step S4 is specifically as follows: when the grid-connected point switch is closed, whether the voltage dividing module is in the first working state is detected, if not, the voltage of the voltage dividing resistor is reduced for multiple times until the resistance value of the voltage dividing resistor is 0, and then the voltage dividing module is switched to the first working state.
8. The microgrid grid-connection adjustment method according to claim 1, characterized by further comprising the step S0: presetting a plurality of microgrid boosting actions and a plurality of microgrid voltage reducing actions;
the plurality of microgrid boosting actions comprises sequentially arranged: the resistance value of the voltage division module is reduced, the microgrid power supply stops charging the energy storage module, and the energy storage module supplies power to the microgrid alternating-current bus;
the plurality of microgrid voltage reduction actions comprises the following steps in sequence: the energy storage module stops supplying power to the microgrid alternating-current bus, the microgrid power supply charges the energy storage module, and the resistance value of the voltage division module is increased;
step S3 specifically includes the following steps:
s31, comparing the main grid alternating current bus voltage with the micro grid alternating current bus voltage;
s32, when the main grid alternating-current bus voltage is larger than the microgrid alternating-current bus voltage, sequentially executing a plurality of microgrid boosting actions according to the current microgrid working state until the microgrid alternating-current bus voltage is consistent with the main grid alternating-current bus voltage, and then closing a grid-connected point switch;
s33, when the main grid alternating-current bus voltage is smaller than the microgrid alternating-current bus voltage, sequentially executing a plurality of microgrid voltage reduction actions according to the current microgrid working state until the microgrid alternating-current bus voltage is consistent with the main grid alternating-current bus voltage, and then closing a grid-connected point switch;
and S34, when the main grid alternating current bus voltage is equal to the microgrid alternating current bus voltage, closing the grid-connected point switch.
9. The microgrid grid-connection adjustment method according to claim 1, characterized in that in step S2, the energy storage module adopts a storage battery or a super capacitor.
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