CN116937532A - DC micro-grid voltage self-adaptive dynamic compensation control system and control method - Google Patents
DC micro-grid voltage self-adaptive dynamic compensation control system and control method Download PDFInfo
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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
- H02J1/00—Circuit arrangements for dc mains or dc distribution networks
- H02J1/10—Parallel operation of dc sources
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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
- H02J1/00—Circuit arrangements for dc mains or dc distribution networks
- H02J1/14—Balancing the load in a network
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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
- H02J2300/00—Systems for supplying or distributing electric power characterised by decentralized, dispersed, or local generation
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Abstract
The invention discloses a direct-current micro-grid voltage self-adaptive dynamic compensation control system and a control method, wherein the method comprises the following steps: a main energy storage additional synchronous motor control loop in the direct-current micro-grid, and auxiliary energy adopts constant power control; obtaining a self-adaptive virtual inertia control equation according to the influence of virtual inertia on the stability, inertia and dynamic response of the direct current micro-grid and the change condition of bus voltage during oscillation; obtaining a self-adaptive power compensation equation according to the relation between auxiliary energy storage and bus voltage power exchange during steady state and voltage fluctuation; and the self-adaptive virtual inertia and the self-adaptive power compensation are coordinated to control, so that the abrupt change of the direct current bus voltage when the output of the new energy source and the load fluctuate is inhibited, and the electric energy quality is improved. According to the invention, through the direct-current micro-grid voltage self-adaptive dynamic compensation control method, direct-current bus voltage mutation caused by new energy output intermittence and load fluctuation is effectively inhibited, and the electric energy quality and the system stability are improved.
Description
Technical Field
The invention relates to the technical field of direct-current micro-grid voltage dynamic control, in particular to a direct-current micro-grid voltage self-adaptive dynamic compensation control system and a control method.
Background
With the increasing prominence of fossil fuel shortages and environmental issues, new energy-based power grids are receiving widespread attention. The direct-current micro-grid constructed by the distributed power supply and the load not only can meet the power quality and safety requirements of local users, but also can reduce the influence of the penetration of the distributed power supply on a power system. However, with the access of a large number of low-inertia power electronic equipment, the whole direct-current micro-grid presents a low-inertia state, and the intermittence of new energy output and the fluctuation of load can have great influence on the voltage of the direct-current bus, so that the voltage of the bus is suddenly changed, and the stable operation of the direct-current micro-grid is directly threatened.
The inertia of the direct current micro-grid is mainly reflected in the capability of preventing voltage abrupt change when the system is disturbed, and virtual inertia control is introduced for ensuring the stability of bus voltage. Although the capacity of the virtual inertia control to inhibit the busbar voltage mutation to a certain extent is better than that of the sagging control, the degree of improvement of the inhibition effect by different virtual inertia is different, if the capacity of inhibiting the busbar voltage drop by small inertia is poorer, and the larger virtual inertia threatens the stability of the system, the time required for the busbar voltage to restore to be stable is greatly increased, so that the self-adaptive control of the virtual inertia needs to be realized, and the adjustment can be timely carried out according to the change condition of the busbar voltage.
When larger load fluctuation occurs in the direct-current micro-grid, the virtual inertia control can timely restrain the falling of the bus voltage, but the falling amplitude of the bus voltage is still larger, the voltage value after the stable recovery is larger than the rated bus voltage, the voltage quality is poorer, and compensation needs to be timely carried out according to the conditions, so that the voltage deviation is reduced.
Disclosure of Invention
Aiming at the problem that the voltage quality is poor when larger power fluctuation occurs in the direct-current micro-grid in the background art, the invention provides a direct-current micro-grid voltage self-adaptive dynamic compensation control system and a control method, and the voltage quality of the direct-current micro-grid when new energy output or load fluctuation occurs is improved.
In order to achieve the above purpose, the present invention adopts the following technical scheme:
the direct-current micro-grid voltage self-adaptive dynamic compensation control system is implemented on a direct-current micro-grid, wherein the structure of the direct-current micro-grid comprises a new energy source, energy storage, an alternating-current power grid and a load, and the direct-current micro-grid voltage self-adaptive dynamic compensation control system comprises a main energy storage, an auxiliary energy storage, a self-adaptive virtual inertia control module and a self-adaptive power compensation module; the main energy storage and the auxiliary energy storage are connected to a direct-current micro-grid through a bidirectional DC/DC converter; the main energy storage comprises a first main energy storage and a second main energy storage, the first main energy storage and the second main energy storage are connected in parallel through sagging control, and the auxiliary energy storage operates in a constant power control mode; the new energy source operates in a maximum power point tracking control mode, the alternating current power grid is connected to a direct current micro power grid through a grid-connected inverter controlled by PQ, and the load is mainly a constant power load;
when the direct current micro-grid is in normal operation, the self-adaptive virtual inertia control module controls the virtual inertia value to be a virtual inertia initial value, and when the busbar voltage of the direct current micro-grid fluctuates, the self-adaptive virtual inertia control module controls the virtual inertia to increase and controls the virtual inertia to decrease after the fluctuation is over;
when the bus voltage is lower than the rated value, the self-adaptive power compensation module controls auxiliary energy storage to output power compensation to the direct-current micro-grid, so that the decrease of the bus voltage is reduced; when the bus voltage is higher than the rated value, the self-adaptive power compensation module controls auxiliary energy storage to absorb power from the direct-current micro-grid, and the rise of the bus voltage is reduced.
The invention also provides a DC micro-grid voltage self-adaptive dynamic compensation control method based on the DC micro-grid voltage self-adaptive dynamic compensation control system, which is implemented on the DC micro-grid, and comprises the following steps:
s1, adding main energy storage responsible for voltage stabilization and auxiliary energy storage providing additional power support into a direct-current micro-grid;
s2, a main energy storage control loop is established, wherein the main energy storage control loop comprises droop control, a synchronous motor control loop and voltage and current double-loop control; obtaining a main energy storage given output current through droop control, obtaining a reference value of a direct current bus voltage through additional synchronous motor control of the main energy storage given output current, and obtaining a main energy storage actual output current and a PWM signal through voltage current double-loop control of the reference value of the direct current bus voltage; establishing an additional synchronous motor control equation according to the condition of the synchronous motor control loop in the main energy storage control loop; obtaining a transfer function of a main energy storage control loop according to an additional synchronous motor control equation; obtaining root tracks and unit step responses under different virtual inertia according to the transfer function so as to determine a self-adaptive virtual inertia control equation;
s3, an auxiliary energy storage control loop is established, the auxiliary energy storage is controlled by the bidirectional DC/DC converter under the condition of constant power, and a self-adaptive power compensation equation is obtained according to the relation between the auxiliary energy storage output side and bus side power exchange when the DC bus voltage is disturbed;
s4, when the busbar voltage of the direct-current micro-grid fluctuates, calculating virtual inertia according to a self-adaptive virtual inertia control equation, and controlling the main energy storage to inhibit the sudden change of the busbar voltage according to the virtual inertia; and calculating a power compensation value according to the self-adaptive power compensation equation, and determining whether the auxiliary energy storage outputs power compensation to the direct-current micro-grid or absorbs power from the direct-current micro-grid according to the high-low relation between the bus voltage and the rated value.
In order to optimize the technical scheme, the specific measures adopted further comprise:
further, in S2, the additional synchronous motor control equation is specifically:
c in the formula v Is virtual inertia, D is damping coefficient, u 0 ref For DC bus voltage rating, u 0 * I is the reference value of the voltage of the direct current bus obtained after the control of the additional synchronous motor set Is mainly used for storing energyConstant output current, i 0 The actual output current is stored for the main energy.
Further, in S2, the transfer function of the main energy storage control loop is specifically:
wherein R is b Is an energy storage parasitic resistance, L is an energy storage power supply side inductance, C is an energy storage output side capacitance, i L For the energy storage power supply side to output current, C v Is virtual inertia, D is damping coefficient, k is droop coefficient, k pu Represents the voltage outer loop scaling factor, k iu Represents the integral coefficient, k, of the outer ring of the voltage pi Represents the current inner loop proportionality coefficient, k ii Representing the integral coefficient of the inner loop of the current, T being the transfer function, G 1 ～G 12 The code numbers used for convenience of formulation.
Further, in S2, the adaptive virtual inertia control equation is specifically:
c in the formula v Is virtual inertia, C v0 Is the virtual inertia initial value, du 0 Dt is the rate of change of the bus voltage, deltau 0 For the variation of bus voltage, delta u is used 0 And du 0 The product of/dt is used to determine if an increase in inertia is required and arctan is used for clipping, A, B being an adaptive parameter.
Further, in S3, the relationship between the auxiliary energy storage output side and the bus side power exchange is specifically:
wherein R is dc For the line impedance u dc The voltage is direct current bus voltage, u is auxiliary energy storage output voltage, and Deltau is the disturbance quantity of bus voltage;
the adaptive power compensation equation is specifically:
in the method, in the process of the invention,and delta P is the obtained power compensation value for the direct current bus voltage reference value.
Further, S4 is specifically:
when the busbar voltage of the direct current micro-grid fluctuates, calculating virtual inertia according to a self-adaptive virtual inertia control equation, timely increasing the virtual inertia according to the change condition of the busbar voltage, controlling the main energy storage to inhibit the sudden change of the busbar voltage, and reducing the virtual inertia after the fluctuation is finished; calculating a power compensation value according to the self-adaptive power compensation equation, and outputting power compensation to the direct-current micro-grid by the auxiliary energy storage when the bus voltage is lower than the rated value, so as to reduce the decrease of the bus voltage; when the bus voltage is higher than the rated value, the auxiliary energy storage absorbs power from the direct-current micro-grid, and the rise of the bus voltage is reduced.
The beneficial effects of the invention are as follows:
by introducing voltage self-adaptive dynamic compensation control into the direct-current micro-grid, the dynamic stability of the direct-current bus voltage is improved. When the output or load of the new energy fluctuates, the main energy storage self-adaptive virtual inertia control can inhibit abrupt change of the busbar voltage, and meanwhile, when the busbar voltage is lower than a rated value, the auxiliary power supply can timely support the direct-current micro-grid power, so that the reduction of the busbar voltage is reduced; when the bus voltage is higher than the rated value, the auxiliary energy storage can absorb power from the direct-current micro-grid, so that the rise of the bus voltage and the waste of resources are reduced.
Drawings
Fig. 1 is a schematic flow chart of a direct current micro-grid voltage adaptive dynamic compensation control method according to the present invention;
fig. 2 is a schematic diagram of a dc micro-grid architecture for implementing a dc micro-grid voltage adaptive dynamic compensation control method according to the present invention;
FIG. 3 is a primary energy storage control loop;
FIG. 4 is a secondary energy storage control loop;
FIG. 5 is a diagram showing the equivalent power fluctuation of the new energy output and the load in the DC micro-grid voltage adaptive dynamic compensation control method according to the present invention;
fig. 6 is a diagram of simulation results of a direct current micro-grid voltage adaptive dynamic compensation control method according to the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention more clear, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention.
In an embodiment, the invention provides a direct-current micro-grid voltage adaptive dynamic compensation control system, which is implemented on a direct-current micro-grid, wherein the direct-current micro-grid structure is shown in fig. 2, the structure of the direct-current micro-grid comprises a new energy source, an energy storage, an alternating-current power grid and a load, and the direct-current micro-grid voltage adaptive dynamic compensation control system comprises a main energy storage, an auxiliary energy storage, an adaptive virtual inertia control module and an adaptive power compensation module; the main energy storage and the auxiliary energy storage are connected to a direct-current micro-grid through a bidirectional DC/DC converter; the main energy storage comprises a first main energy storage and a second main energy storage, the first main energy storage and the second main energy storage are connected in parallel through sagging control, and the auxiliary energy storage operates in a constant power control mode; the new energy source operates in a maximum power point tracking control mode, the alternating current power grid is connected to a direct current micro power grid through a grid-connected inverter controlled by PQ, and the load is mainly a constant power load;
when the direct current micro-grid is in normal operation, the self-adaptive virtual inertia control module controls the virtual inertia value to be a virtual inertia initial value, and when the busbar voltage of the direct current micro-grid fluctuates, the self-adaptive virtual inertia control module controls the virtual inertia to increase and controls the virtual inertia to decrease after the fluctuation is over;
when the bus voltage is lower than the rated value, the self-adaptive power compensation module controls auxiliary energy storage to output power compensation to the direct-current micro-grid, so that the decrease of the bus voltage is reduced; when the bus voltage is higher than the rated value, the self-adaptive power compensation module controls auxiliary energy storage to absorb power from the direct-current micro-grid, and the rise of the bus voltage is reduced.
In another embodiment, the present invention provides a dc micro-grid voltage adaptive dynamic compensation control method based on the dc micro-grid voltage adaptive dynamic compensation control system according to the first embodiment, which is implemented on a dc micro-grid, and a flowchart of the method is shown in fig. 1, and the method includes the following steps:
s1, adding main energy storage responsible for voltage stabilization and auxiliary energy storage providing additional power support into a direct-current micro-grid;
s2, a main energy storage control loop is established, wherein the main energy storage control loop comprises droop control, a synchronous motor control loop and voltage and current double-loop control; obtaining a main energy storage given output current through droop control, obtaining a reference value of a direct current bus voltage through additional synchronous motor control of the main energy storage given output current, and obtaining a main energy storage actual output current and a PWM signal through voltage current double-loop control of the reference value of the direct current bus voltage; establishing an additional synchronous motor control equation according to the condition of the synchronous motor control loop in the main energy storage control loop; obtaining a transfer function of a main energy storage control loop according to an additional synchronous motor control equation; obtaining root tracks and unit step responses under different virtual inertia according to the transfer function so as to determine a self-adaptive virtual inertia control equation;
s3, an auxiliary energy storage control loop is established, the auxiliary energy storage is controlled by the bidirectional DC/DC converter under the condition of constant power, and a self-adaptive power compensation equation is obtained according to the relation between the auxiliary energy storage output side and bus side power exchange when the DC bus voltage is disturbed;
s4, when the busbar voltage of the direct-current micro-grid fluctuates, calculating virtual inertia according to a self-adaptive virtual inertia control equation, and controlling the main energy storage to inhibit the sudden change of the busbar voltage according to the virtual inertia; and calculating a power compensation value according to the self-adaptive power compensation equation, and determining whether the auxiliary energy storage outputs power compensation to the direct-current micro-grid or absorbs power from the direct-current micro-grid according to the high-low relation between the bus voltage and the rated value.
A simulation system is built in Matlab/Simulink, a direct-current micro-grid structure is shown in figure 2, and the rated direct-current bus voltage is 750V in the simulation process; standard illumination intensity of 1000W/m 2 The temperature is 25 ℃; the energy storage unit voltage is 400V; the auxiliary energy storage provides 1kw of power support; an initial load of 100kw; the ac grid provides 1kw of power to the dc micro grid.
In step S2, as shown in fig. 3, the main energy storage control loop, and in step S2, the additional synchronous motor control equation specifically includes:
c in the formula v Is virtual inertia, D is damping coefficient, u 0 ref For DC bus voltage rating, u 0 * I is the reference value of the voltage of the direct current bus obtained after the control of the additional synchronous motor set For the main energy storage to give output current, i 0 The actual output current is stored for the main energy.
The transfer function of the main energy storage control loop is specifically as follows:
wherein R is b Is an energy storage parasitic resistance, L is an energy storage power supply side inductance, C is an energy storage output side capacitance, i L For the energy storage power supply side to output current, C v Is virtual inertia, D is damping coefficient, k is droop coefficient, k pu Represents the voltage outer loop scaling factor, k iu Representing electricityIntegral coefficient of outer ring, k pi Represents the current inner loop proportionality coefficient, k ii Representing the integral coefficient of the inner loop of the current, T being the transfer function, G 1 ～G 12 The code numbers used for convenience of formulation.
In S2, the adaptive virtual inertia control equation specifically includes:
c in the formula v Is virtual inertia, C v0 Is the virtual inertia initial value, du 0 Dt is the rate of change of the bus voltage, deltau 0 For the variation of bus voltage, delta u is used 0 And du 0 The product of/dt is used to determine if an increase in inertia is required and arctan is used for clipping, A, B being an adaptive parameter.
In S3, the relationship between the auxiliary energy storage output side and the bus side power exchange is specifically:
wherein R is dc For the line impedance u dc The voltage is direct current bus voltage, u is auxiliary energy storage output voltage, and Deltau is the disturbance quantity of bus voltage;
the adaptive power compensation equation is specifically:
in the method, in the process of the invention,and delta P is the obtained power compensation value for the direct current bus voltage reference value.
The auxiliary energy storage control loop is shown in fig. 4, and the given output current of the auxiliary energy storage is obtained through voltage and current double loops after given power in the fixed power control loop is added with a power compensation value.
In the step S4, voltage adaptive dynamic compensation control is introduced into the dc micro-grid, so as to improve the dynamic stability of the dc bus voltage. When the output or load of the new energy fluctuates, the main energy storage self-adaptive virtual inertia control can inhibit abrupt change of the busbar voltage, and meanwhile, when the busbar voltage is lower than a rated value, the auxiliary power supply can timely support the direct-current micro-grid power, so that the reduction of the busbar voltage is reduced; when the bus voltage is higher than the rated value, the auxiliary energy storage can absorb power from the direct-current micro-grid, so that the rise of the bus voltage and the waste of resources are reduced.
In the simulation of step S4, referring to fig. 5, the equivalent power changes of the photovoltaic power, the ac power grid and the load are equivalent, where an equivalent power greater than 0 indicates that the power required by the load in the dc micro-grid is greater than the power generated by the new energy, and an equivalent power less than 0 indicates that the power required by the load in the dc micro-grid is less than the power generated by the new energy.
In fig. 6, simulation result diagrams of conventional droop control and dc micro-grid voltage adaptive dynamic compensation control are respectively set, an initial value of adaptive virtual inertia is set to 0.2F, and a maximum output of auxiliary energy storage is set to 21kw. It can be seen that when the main energy storage only adopts droop control and the auxiliary energy storage only adopts constant power control, when the equivalent load fluctuates, the bus voltage can generate larger deviation, and the voltage quality is seriously affected. When the main energy storage and the auxiliary energy storage adopt direct-current micro-grid voltage self-adaptive dynamic compensation control, the same load fluctuation is faced, the bus voltage offset is reduced, and particularly when the new energy output is larger than the power required by the load, the auxiliary energy storage can be converted from providing power support for the direct-current micro-grid to absorbing power from the direct-current micro-grid, so that the bus voltage mutation is effectively restrained, and meanwhile, the resource waste is avoided.
The above is only a preferred embodiment of the present invention, and the protection scope of the present invention is not limited to the above examples, and all technical solutions belonging to the concept of the present invention belong to the protection scope of the present invention. It should be noted that modifications and adaptations to the invention without departing from the principles thereof are intended to be within the scope of the invention as set forth in the following claims.
Claims (7)
1. The direct-current micro-grid voltage self-adaptive dynamic compensation control system is implemented on a direct-current micro-grid and is characterized in that the structure of the direct-current micro-grid comprises a new energy source, energy storage, an alternating-current grid and a load, and the direct-current micro-grid voltage self-adaptive dynamic compensation control system comprises a main energy storage, an auxiliary energy storage, a self-adaptive virtual inertia control module and a self-adaptive power compensation module; the main energy storage and the auxiliary energy storage are connected to a direct-current micro-grid through a bidirectional DC/DC converter; the main energy storage comprises a first main energy storage and a second main energy storage, the first main energy storage and the second main energy storage are connected in parallel through sagging control, and the auxiliary energy storage operates in a constant power control mode; the new energy source operates in a maximum power point tracking control mode, the alternating current power grid is connected to a direct current micro power grid through a grid-connected inverter controlled by PQ, and the load is mainly a constant power load;
when the direct current micro-grid is in normal operation, the self-adaptive virtual inertia control module controls the virtual inertia value to be a virtual inertia initial value, and when the busbar voltage of the direct current micro-grid fluctuates, the self-adaptive virtual inertia control module controls the virtual inertia to increase and controls the virtual inertia to decrease after the fluctuation is over;
when the bus voltage is lower than the rated value, the self-adaptive power compensation module controls auxiliary energy storage to output power compensation to the direct-current micro-grid, so that the decrease of the bus voltage is reduced; when the bus voltage is higher than the rated value, the self-adaptive power compensation module controls auxiliary energy storage to absorb power from the direct-current micro-grid, and the rise of the bus voltage is reduced.
2. A direct current micro grid voltage adaptive dynamic compensation control method based on the direct current micro grid voltage adaptive dynamic compensation control system of claim 1, implemented on a direct current micro grid, characterized in that the method comprises the following steps:
s1, adding main energy storage responsible for voltage stabilization and auxiliary energy storage providing additional power support into a direct-current micro-grid;
s2, a main energy storage control loop is established, wherein the main energy storage control loop comprises droop control, a synchronous motor control loop and voltage and current double-loop control; obtaining a main energy storage given output current through droop control, obtaining a reference value of a direct current bus voltage through additional synchronous motor control of the main energy storage given output current, and obtaining a main energy storage actual output current and a PWM signal through voltage current double-loop control of the reference value of the direct current bus voltage; establishing an additional synchronous motor control equation according to the condition of the synchronous motor control loop in the main energy storage control loop; obtaining a transfer function of a main energy storage control loop according to an additional synchronous motor control equation; obtaining root tracks and unit step responses under different virtual inertia according to the transfer function so as to determine a self-adaptive virtual inertia control equation;
s3, an auxiliary energy storage control loop is established, the auxiliary energy storage is controlled by the bidirectional DC/DC converter under the condition of constant power, and a self-adaptive power compensation equation is obtained according to the relation between the auxiliary energy storage output side and bus side power exchange when the DC bus voltage is disturbed;
s4, when the busbar voltage of the direct-current micro-grid fluctuates, calculating virtual inertia according to a self-adaptive virtual inertia control equation, and controlling the main energy storage to inhibit the sudden change of the busbar voltage according to the virtual inertia; and calculating a power compensation value according to the self-adaptive power compensation equation, and determining whether the auxiliary energy storage outputs power compensation to the direct-current micro-grid or absorbs power from the direct-current micro-grid according to the high-low relation between the bus voltage and the rated value.
3. The method for controlling voltage adaptive dynamic compensation of a direct current micro-grid according to claim 2, wherein in S2, the additional synchronous motor control equation is specifically:
c in the formula v Is virtual inertia, D is damping coefficient, u 0 ref For DC bus voltage rating, u 0 * I is the reference value of the voltage of the direct current bus obtained after the control of the additional synchronous motor set For the main energy storage to give output current, i 0 Is mainly used for storing energyAnd outputting current.
4. The method for adaptively controlling dynamic compensation of voltage of a direct current micro-grid according to claim 2, wherein in S2, the transfer function of the main energy storage control loop is specifically:
wherein R is b Is an energy storage parasitic resistance, L is an energy storage power supply side inductance, C is an energy storage output side capacitance, i L For the energy storage power supply side to output current, C v Is virtual inertia, D is damping coefficient, k is droop coefficient, k pu Represents the voltage outer loop scaling factor, k iu Represents the integral coefficient, k, of the outer ring of the voltage pi Represents the current inner loop proportionality coefficient, k ii Representing the integral coefficient of the inner loop of the current, T being the transfer function, G 1 ～G 12 The code numbers used for convenience of formulation.
5. The method for controlling voltage adaptive dynamic compensation of a direct current micro grid according to claim 2, wherein in S2, the adaptive virtual inertia control equation is specifically:
c in the formula v Is virtual inertia, C v0 Is the virtual inertia initial value, du 0 Dt is the rate of change of the bus voltage, deltau 0 For the variation of bus voltage, delta u is used 0 And du 0 The product of/dt is used to determine if an increase in inertia is required and arctan is used for clipping, A, B being an adaptive parameter.
6. The method for controlling voltage adaptive dynamic compensation of a direct current micro-grid according to claim 2, wherein in S3, the relationship between the auxiliary energy storage output side and the bus side power exchange is specifically:
wherein R is dc For the line impedance u dc The voltage is direct current bus voltage, u is auxiliary energy storage output voltage, and Deltau is the disturbance quantity of bus voltage;
the adaptive power compensation equation is specifically:
in the method, in the process of the invention,and delta P is the obtained power compensation value for the direct current bus voltage reference value.
7. The direct current micro grid voltage adaptive dynamic compensation control method according to claim 2, wherein S4 is specifically:
when the busbar voltage of the direct current micro-grid fluctuates, calculating virtual inertia according to a self-adaptive virtual inertia control equation, timely increasing the virtual inertia according to the change condition of the busbar voltage, controlling the main energy storage to inhibit the sudden change of the busbar voltage, and reducing the virtual inertia after the fluctuation is finished; calculating a power compensation value according to the self-adaptive power compensation equation, and outputting power compensation to the direct-current micro-grid by the auxiliary energy storage when the bus voltage is lower than the rated value, so as to reduce the decrease of the bus voltage; when the bus voltage is higher than the rated value, the auxiliary energy storage absorbs power from the direct-current micro-grid, and the rise of the bus voltage is reduced.
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110212513A (en) * | 2019-04-30 | 2019-09-06 | 华北电力大学（保定） | A kind of flexible simulated capacitance control method of stable DC microgrid busbar voltage fluctuation |
| CN113765090A (en) * | 2021-09-02 | 2021-12-07 | 电子科技大学长三角研究院(湖州) | Virtual inertia voltage stabilization prediction method for energy-saving direct-current micro-grid model in battery test |
| CN115313347A (en) * | 2022-08-25 | 2022-11-08 | 华北电力大学（保定） | Transient state self-adaptive virtual inertia control method for storage battery in direct-current micro-grid |
| US20220368133A1 (en) * | 2021-08-16 | 2022-11-17 | Hunan University | Method and system for evaluating inertia of power system and storage medium |
| CN115425636A (en) * | 2022-09-19 | 2022-12-02 | 山西大学 | Flywheel energy storage-containing direct current microgrid virtual inertia self-adaptive control method |
| CN116169661A (en) * | 2023-03-14 | 2023-05-26 | 广东工业大学 | Comprehensive control method for busbar voltage of direct-current micro-grid |
-
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- 2023-07-25 CN CN202310913987.5A patent/CN116937532A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110212513A (en) * | 2019-04-30 | 2019-09-06 | 华北电力大学（保定） | A kind of flexible simulated capacitance control method of stable DC microgrid busbar voltage fluctuation |
| US20220368133A1 (en) * | 2021-08-16 | 2022-11-17 | Hunan University | Method and system for evaluating inertia of power system and storage medium |
| CN113765090A (en) * | 2021-09-02 | 2021-12-07 | 电子科技大学长三角研究院(湖州) | Virtual inertia voltage stabilization prediction method for energy-saving direct-current micro-grid model in battery test |
| CN115313347A (en) * | 2022-08-25 | 2022-11-08 | 华北电力大学（保定） | Transient state self-adaptive virtual inertia control method for storage battery in direct-current micro-grid |
| CN115425636A (en) * | 2022-09-19 | 2022-12-02 | 山西大学 | Flywheel energy storage-containing direct current microgrid virtual inertia self-adaptive control method |
| CN116169661A (en) * | 2023-03-14 | 2023-05-26 | 广东工业大学 | Comprehensive control method for busbar voltage of direct-current micro-grid |
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