CN112134311B - Control method, device, equipment and storage medium for small hydropower station power grid - Google Patents

Control method, device, equipment and storage medium for small hydropower station power grid Download PDF

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Publication number
CN112134311B
CN112134311B CN202010967809.7A CN202010967809A CN112134311B CN 112134311 B CN112134311 B CN 112134311B CN 202010967809 A CN202010967809 A CN 202010967809A CN 112134311 B CN112134311 B CN 112134311B
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power
grid
hydropower station
small hydropower
power grid
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CN112134311A (en
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王娴
欧阳本凯
贾恒杰
胡烈良
刘配配
黄伟
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Shaoguan Power Supply Bureau Guangdong Power Grid Co Ltd
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Shaoguan Power Supply Bureau Guangdong Power Grid Co Ltd
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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
    • H02J3/46—Controlling of the sharing of output between the generators, converters, or transformers
    • H02J3/48—Controlling the sharing of the in-phase component
    • 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
    • H02J3/24—Arrangements for preventing or reducing oscillations of power in networks
    • H02J3/241—The oscillation concerning frequency
    • 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
    • H02J3/388—Islanding, i.e. disconnection of local power supply from the network
    • 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
    • H02J3/50—Controlling the sharing of the out-of-phase component
    • 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
    • H02J2300/20—The dispersed energy generation being of renewable origin

Abstract

The embodiment of the invention discloses a control method, a control device, control equipment and a storage medium for a small hydropower station power grid. The control method of the small hydropower station power grid comprises the following steps: acquiring first time when a main power grid is disconnected with a small hydropower station power grid; measuring the exchange power between the small hydropower station and a main power grid when the power grid is stable; if the exchange power meets the regulation requirement of the small hydropower station power grid, regulating the frequency of the small hydropower station power grid before the first time so that the frequency of the small hydropower station power grid matches the frequency of the main power grid; and if the exchange power does not meet the regulation requirement of the small hydropower station power grid, splitting the small hydropower station power grid. According to the technical scheme of the embodiment of the invention, the coping processing method is provided for the planned island, the running stability of the small hydropower station power grid and the main power grid is improved, and the electric energy utilization rate and the power supply reliability of the small hydropower station power grid are improved.

Description

Control method, device, equipment and storage medium for small hydropower station power grid
Technical Field
The embodiment of the invention relates to the technical field of power systems, in particular to a method, a device, equipment and a storage medium for controlling a small hydropower station power grid.
Background
The small hydropower stations are usually hydropower stations or hydroelectric power generation devices with small capacity, and are easy to build and low in cost, so that the small hydropower stations are large in number and wide in distribution in China. In addition, as the hydraulic resources utilized by the small hydropower station are more environment-friendly, the full development and utilization of the hydraulic resources are accelerated. When the main power grid of the electric power system needs to be overhauled, the main power grid is disconnected with the small hydropower station micro-grid, and therefore the small hydropower station power grid forms an island effect. Due to the balanced disconnection of the connection with the main power grid, the operation of the small hydropower station power grid after the islanding is unstable, which affects the continuous power supply and the power supply efficiency of the small hydropower station power grid to the local load.
In the prior art, a small hydropower station power grid aiming at a planned island is usually processed in a way that the small hydropower station power grid is disconnected within planned time, when an island effect occurs, a main power grid cannot control the voltage and the frequency of a power supply island, and voltage amplitude and frequency drift of the small hydropower station power grid can damage electric equipment. After the main power grid is repaired and reconnected with the small hydropower station power grid, because a phase difference is generated between the output voltage of the grid-connected system of the small hydropower station power grid and the voltage of the main power grid, surge current can be generated when the main power grid recovers power supply, and secondary tripping or damage to loads and hydropower devices can be caused.
Disclosure of Invention
The embodiment of the invention provides a control method, a control device, control equipment and a storage medium for a small hydropower station power grid, so as to provide a coping processing method for a planned island and improve the running stability of the small hydropower station power grid and a main power grid.
In a first aspect, an embodiment of the present invention provides a method for controlling a power grid of a small hydropower station, including:
acquiring first time when a main power grid is disconnected with a small hydropower station power grid;
measuring the exchange power between the small hydropower station power grid and the main power grid when the small hydropower station power grid is stable;
if the exchange power meets the adjustment requirement of the small hydropower station power grid, adjusting the exchange power of the small hydropower station power grid before the first time so as to enable the exchange power to be zero;
and if the exchange power does not meet the regulation requirement of the small hydropower station power grid, splitting the small hydropower station power grid.
Optionally, the exchange power is a product of a voltage value and a current value of a side of the mini-hydropower-station grid connected to the main grid.
Optionally, the exchange power comprises active exchange power and reactive exchange power, and the regulatory requirement of the mini-hydropower-station grid comprises:
the absolute value of the active exchange power is less than or equal to the active limit power of a hydroelectric generating set of the small hydropower station power grid; and/or the absolute value of the reactive exchange power is less than or equal to the reactive limit power of the hydroelectric generating set of the small hydropower station power grid.
Optionally, adjusting the exchange power of the mini-hydropower-station grid before the first time to be zero comprises:
calculating out-of-limit time required for the frequency change of the small hydropower station grid to the frequency of the main grid;
determining power adjustment time of the small hydropower station power grid according to the first time and the out-of-limit time;
adjusting the switching power at the power adjustment time to bring the switching power to zero.
Optionally, calculating an out-of-limit time required for the frequency of the mini-hydro power plant grid to change to the frequency of the main grid comprises:
calculating the frequency change rate of the small hydropower station power grid corresponding to the exchange power;
and calculating the out-of-limit time according to the difference value of the frequency of the small hydropower station power grid and the frequency of the main power grid and the frequency change rate.
Optionally, the time-out-of-limit is calculated as:
f1-f2＝TC·fC；
wherein the content of the first and second substances,
Figure BDA0002682987160000031
TCfor said out-of-limit time, f1For the frequency, f, of the electric network of said small hydropower station2Is the frequency of the main power grid, fCFor the rate of change of the frequency，PchangeFor the exchange power, H is a water wheel inertia time constant of a hydroelectric generating set of the small hydropower station power grid, SHydroThe capacity of a hydroelectric generating set of the small hydropower station power grid.
Optionally, adjusting the switching power at the power adjustment time to make the switching power zero comprises:
when the exchange power is larger than zero, reducing the output power of a hydroelectric generating set of the small hydropower station power grid;
and when the exchange power is less than zero, increasing the output power of the hydroelectric generating set of the small hydropower station power grid.
In a second aspect, an embodiment of the present invention further provides a control device for a small hydropower station grid, including:
the first time acquisition module is used for acquiring the first time when the main power grid is disconnected with the small hydropower station power grid;
the exchange power measurement module is used for measuring the exchange power between the small hydropower station and the main power grid when the power grid is stable;
a first control module for adjusting the exchange power of the mini-hydropower-station grid before the first time to be zero;
and the second control module is used for splitting the small hydropower station power grid when the exchange power does not meet the regulation requirement of the small hydropower station power grid.
In a third aspect, an embodiment of the present invention further provides an electronic device, where the electronic device includes:
one or more processors;
storage means for storing one or more programs;
when executed by the one or more processors, cause the one or more processors to implement the method of controlling a mini-hydropower-station grid according to the first aspect.
In a fourth aspect, embodiments of the present invention further provide a computer-readable storage medium, on which a computer program is stored, which when executed by a processor, implements the control method for a small hydropower station grid according to the first aspect.
According to the technical scheme of the embodiment of the invention, when the exchange power between the small hydropower station power grid and the main power grid meets the regulation requirement of the small hydropower station power grid, the exchange power of the small hydropower station power grid is regulated before the first time when the main power grid is disconnected from the small hydropower station power grid, so that the exchange power between the small hydropower station power grid and the main power grid is zero, and the power balance is achieved. Therefore, on one hand, after the connection between the main power grid and the small hydropower station power grid is disconnected, the small hydropower station power grid which runs in an isolated island mode can still stably maintain the electricity supply to the local load, the electric energy utilization rate of the small hydropower station power grid is improved, and the power supply reliability is improved. On the other hand, after the main power grid is repaired and the small hydropower station power grid is reestablished, the power balance between the main power grid and the small hydropower station power grid is continuously kept, and the phenomenon that the main power grid and the small hydropower station power grid generate surge current due to frequency difference is avoided, so that tripping is caused or damage is brought to loads and small hydropower station devices. And if the exchange power does not meet the regulation requirement of the small hydropower station power grid, splitting the small hydropower station power grid to prevent accidents caused by the fact that the small hydropower station power grid system cannot stably operate. The technical scheme of the embodiment of the invention solves the technical problems that planned maintenance of the main power grid in the prior art brings an island effect to the small hydropower station power grid, so that the small hydropower station power grid is unstable in operation and cannot guarantee continuous and reliable power supply to a local load, and after the main power grid and the small hydropower station power grid are restored to be connected, surge current caused by frequency difference between the main power grid and the small hydropower station power grid and damage to a load or a system device and the like, realizes providing a coping processing method for a planned island, improves the operation stability of the small hydropower station power grid and the main power grid, and improves the electric energy utilization rate and the power supply reliability of the small hydropower station power grid.
Drawings
Fig. 1 is a schematic flow chart of a control method for a small hydropower station grid according to an embodiment of the invention;
fig. 2 is a schematic flow chart of a power regulation method for a small hydropower station grid according to an embodiment of the invention;
fig. 3 is a schematic flow chart of another method for controlling a small hydropower station grid according to an embodiment of the invention;
fig. 4 is a schematic structural diagram of a control device of a small hydropower station power grid according to an embodiment of the invention;
fig. 5 is a schematic structural diagram of a terminal according to an embodiment of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting of the invention. It should be further noted that, for the convenience of description, only some of the structures related to the present invention are shown in the drawings, not all of the structures.
Example one
Fig. 1 is a schematic flow chart of a method for controlling a small hydropower station grid according to an embodiment of the present invention, where the embodiment is applicable to control the small hydropower station grid to cope with an islanding situation caused by disconnection of a main grid from the small hydropower station grid, and the method may be executed by a control device of the small hydropower station grid, where the device may be implemented in software and/or hardware, and the device may be configured in an electronic device, such as a server or a terminal device, where a typical terminal device includes a mobile terminal, and specifically includes a mobile phone, a computer, or a tablet computer. As shown in fig. 1, the method may specifically include:
s110, obtaining the first time when the main power grid is disconnected with the small hydropower station power grid.
Specifically, the small hydropower station grid is connected with the main grid, and as the main grid needs to be maintained and checked at regular time, the main grid needs to be disconnected from the small hydropower station grid during maintenance and check of the main grid. The first time of disconnection of the main power grid and the small hydropower station power grid can be obtained in advance, illustratively, a connection switch for connecting the main power grid and the small hydropower station power grid is arranged on a line for connecting the small hydropower station power grid and the main power grid, the accurate time of disconnection of the connection switch can be obtained in advance, the time is determined as the first time of disconnection of the main power grid and the small hydropower station power grid, the small hydropower station power grid is controlled before the connection between the main power grid and the small hydropower station power grid is disconnected in time, and the phenomenon that the operation of the small hydropower station power grid is influenced by an island effect formed after the main power grid and the small hydropower station power grid are disconnected is avoided.
And S120, measuring the exchange power between the small hydropower station and the main power grid when the power grid is stable.
For example, the mini-hydropower-station grid comprises a controller, the controller can monitor an electric energy parameter of the mini-hydropower-station grid, for example, power monitoring of a tie switch of the mini-hydropower-station grid connected with a main grid, before the tie between the main grid and the mini-hydropower-station grid is disconnected, the mini-hydropower-station grid is connected with the main grid and operates stably, the power of the tie switch of the mini-hydropower-station grid connected with the main grid, which is monitored by the controller, is obtained, and the power is determined as exchange power with the main grid when the mini-hydropower-station grid is stable.
Optionally, the exchange power is the product of the voltage value and the current value on the side of the mini-hydropower-station grid connected to the main grid. Specifically, the power of a tie switch of the small hydropower station power grid connected with the main power grid can be monitored through the controller, the voltage value and the current value of the tie switch measured by the controller are obtained, and the exchange power between the small hydropower station power grid and the main power grid when the small hydropower station power grid is stable is determined according to the product of the voltage value and the current value. Illustratively, if the power of the small hydropower station power grid system is excessive, the small hydropower station power grid system transmits electric energy to the main power grid system, and the exchange power between the small hydropower station power grid system and the main power grid system is larger than zero; if the power of the small hydropower station power grid system is insufficient, the main power grid system transmits power to the small hydropower station power grid system, and the exchange power between the main power grid system and the small hydropower station power grid system is smaller than zero.
And S130, judging whether the exchange power meets the regulation requirement of the power grid of the small hydropower station.
If the exchange power meets the regulation requirement of the small hydropower station power grid, executing S140; if the exchange power does not meet the regulation requirement of the small hydropower station grid, S150 is executed.
Specifically, the adjustment requirement of the small hydropower station grid may be preset, for example, if the absolute value of the exchange power is smaller than or equal to a preset power value, the exchange power is considered to meet the adjustment requirement of the small hydropower station grid, and S150 is executed; and if the absolute value of the exchange power is larger than a certain preset power value, the exchange power is considered not to meet the adjustment requirement of the power grid of the small hydropower station, and S140 is executed. The preset power value can be a power value which ensures that the small hydropower station power grid can normally operate in an isolated island after the main power grid is disconnected with the small hydropower station power grid.
And S140, adjusting the exchange power of the small hydropower station power grid before the first time so as to enable the exchange power to be zero.
Optionally, the exchange power comprises active exchange power, and the regulatory requirements of the mini-hydropower-station grid comprise: the absolute value of the active exchange power is less than or equal to the active limit power of the hydroelectric generating set of the small hydropower station power grid.
The limit power of the hydroelectric generating set of the small hydropower station power grid is the limit power value of the running of the hydroelectric generating set. Illustratively, the active exchange power is PchangeThe active limit power of the hydroelectric generating set is PTMIf | Pchange∣≤PTMIf the switching power is within the regulation limit of the hydroelectric generating set of the small hydropower station grid, the switching power of the small hydropower station grid can be regulated at the first time when the main grid is disconnected from the small hydropower station grid, for example, the switching power between the main grid and the small hydropower station grid is regulated to zero, so that the power balance between the main grid and the small hydropower station grid can be ensured, and the frequency of the small hydropower station grid is stabilized at the frequency of the main grid. Therefore, even after the network is planned to be disconnected, the power grid of the small hydropower station can stably maintain the electricity supply to the local load, the utilization rate of the electric energy of the small hydropower station is greatly improved, and the power supply reliability is improved. In addition, the exchange power between the main power grid and the small hydropower station power grid is adjusted to be zero in advance, so that power balance is realized between the main power grid and the small hydropower station power grid, and the frequency difference caused by power imbalance between the main power grid and the small hydropower station power grid is avoided after the main power grid is repaired and the small hydropower station power grid is reestablished, so that surge current is generated after power supply is recovered, and tripping or tripping is causedCausing damage to the load and small hydropower plant equipment.
Optionally, the exchange power between the mini-hydropower station grid and the main grid is adjusted such that after the exchange power is zero, the communication between the main grid and the mini-hydropower station grid is disconnected for maintenance and inspection of the main grid system.
And S150, splitting the power grid of the small hydropower station.
Optionally, if | Pchange∣＞PTMWhen the main power grid is disconnected from the mini-hydropower grid, the mini-hydropower grid can be disconnected, for example, the connection between the hydro-power unit in the mini-hydropower station and the mini-hydropower grid is cut off, so as to prevent accidents caused by the over-limit of the power of the hydro-power unit.
Optionally, the exchange power further comprises reactive exchange power, and the regulation requirement of the mini-hydropower station grid further comprises: the absolute value of the reactive exchange power is less than or equal to the reactive limit power of the hydroelectric generating set of the small hydropower station power grid.
Illustratively, the reactive exchange power of the mini-hydropower grid is QchangeThe reactive limit power of the hydroelectric generating set is QTMIf | Qchange∣≤QTMIf the exchange power is within the adjustment limit of the hydroelectric generating set of the small hydropower station power grid, the exchange power between the main power grid and the small hydropower station power grid can be adjusted at the first time when the main power grid and the small hydropower station power grid are disconnected, so that power balance between the main power grid and the small hydropower station power grid is realized, the frequency of the small hydropower station power grid is ensured to be stabilized at the frequency of the main power grid, and the frequency difference caused by power imbalance between the main power grid and the small hydropower station power grid can be avoided after the main power grid is repaired and is connected with the small hydropower station power grid again, so that surge current is generated after power supply is recovered, and tripping is caused or damage is brought to a load and a small hydropower station device is caused.
If | Qchange∣＞QTMIf the exchange power exceeds the regulation limit of the hydroelectric generating set of the small-scale hydropower station power grid, after the planned network disconnection, the small-scale hydropower station power grid systemThe system cannot stably operate, so that the small hydropower station power grid can be disconnected after the main power grid and the small hydropower station power grid are disconnected, and accidents caused by the fact that the power of the hydropower unit is over-limited are prevented.
Wherein the reactive exchange power Q of the small hydropower station gridchangeAnd the reactive limit power Q of the hydroelectric generating setTMAll can be based on the corresponding active power, active power P, reactive power Q and power factor angle
Figure BDA0002682987160000091
The relationship between
Figure BDA0002682987160000092
To be determined. Optionally, the above-mentioned manner of determining whether the exchange power meets the regulation requirement of the small hydropower station grid according to the numerical relationship between the absolute value of the active exchange power and the active limit power of the hydroelectric generating set of the small hydropower station grid may be used as a preliminary determination step of determining whether the small hydropower station grid system may operate in a normal island. According to the numerical relation between the absolute value of the reactive exchange power and the reactive limit power of the hydroelectric generating set of the small hydropower station power grid, the mode of judging whether the exchange power meets the regulation requirement of the small hydropower station power grid can be used as an auxiliary judgment step for ensuring whether the small hydropower station power grid system can normally operate in an isolated island mode, so that the reactive power of the small hydropower station power grid system can be transmitted to the main power grid system to reduce loss when the reactive power is supplied or requested.
According to the technical scheme of the embodiment of the invention, when the exchange power between the small hydropower station power grid and the main power grid meets the regulation requirement of the small hydropower station power grid, the exchange power of the small hydropower station power grid is regulated before the first time when the main power grid is disconnected from the small hydropower station power grid, so that the exchange power between the small hydropower station power grid and the main power grid is zero, and the power balance is achieved. Therefore, on one hand, after the connection between the main power grid and the small hydropower station power grid is disconnected, the small hydropower station power grid which runs in an isolated island mode can still stably maintain the electricity supply to the local load, the electric energy utilization rate of the small hydropower station power grid is improved, and the power supply reliability is improved. On the other hand, after the main power grid is repaired and the small hydropower station power grid is reestablished, the power balance between the main power grid and the small hydropower station power grid is continuously kept, and the phenomenon that the main power grid and the small hydropower station power grid generate surge current due to frequency difference is avoided, so that tripping is caused or damage is brought to loads and small hydropower station devices. And if the exchange power does not meet the regulation requirement of the small hydropower station power grid, splitting the small hydropower station power grid to prevent accidents caused by the fact that the small hydropower station power grid system cannot stably operate. The technical scheme of the embodiment of the invention solves the technical problems that planned maintenance of the main power grid in the prior art causes an island effect to the small hydropower station power grid, so that the small hydropower station power grid is unstable in operation and cannot ensure continuous and reliable power supply to a local load, and after the main power grid and the small hydropower station power grid are restored, surge current caused by frequency difference between the main power grid and the small hydropower station power grid and damage to a load or a system device and the like, realizes providing a coping processing method for a planned island, improves the operation stability of the small hydropower station power grid and the main power grid, and improves the electric energy utilization rate and the power supply reliability of the small hydropower station power grid.
Example two
Fig. 2 is a schematic flow chart of a power regulation method for a small hydropower station grid according to an embodiment of the invention. On the basis of the above embodiments, the present embodiment further optimizes the power regulation method of the small hydropower station grid in the above embodiments. Correspondingly, as shown in fig. 2, the method of the present embodiment specifically includes:
s210, calculating out-of-limit time required by the frequency change of the small hydropower station power grid to the frequency of the main power grid.
Illustratively, when exchange power exists between the small hydropower station power grid and the main power grid, the power grid frequency of the small hydropower station power grid and the main power grid has a difference, the exchange power between the small hydropower station power grid and the main power grid needs to be adjusted, so that the frequency is changed, and the out-of-limit time is the adjustment time required for changing the current frequency of the small hydropower station power grid to the frequency of the main power grid.
Optionally, calculating an out-of-limit time required to adjust the frequency of the mini-hydro power plant grid to the frequency of the main grid comprises: calculating the frequency change rate of the small hydropower station power grid corresponding to the exchange power; and calculating the out-of-limit time according to the difference value and the frequency change rate of the frequency of the small hydropower station power grid and the frequency of the main power grid.
In particular, in calculating the out-of-limit time, the rate of change of the frequency of the corresponding mini-hydropower-station grid may first be determined, with the exchange power between the mini-hydropower-station grid and the main grid being the current exchange power. The product of the frequency change rate of the small hydropower station grid and the out-of-limit time of the frequency adjustment of the small hydropower station grid is the frequency adjustment difference of the small hydropower station grid, so that the out-of-limit time can be calculated according to the frequency change rate and the frequency adjustment difference.
Illustratively, the calculation of the time-out-of-limit includes:
Figure BDA0002682987160000111
f1-f2＝TC·fC；
wherein, fCFor the rate of change of frequency, P, of the small hydropower station gridchangeFor the exchange of power between the mini-hydropower station grid and the main grid, H is the water wheel inertia time constant of the hydroelectric power unit of the mini-hydropower station grid, SHydroCapacity of a hydroelectric power unit of a small hydropower station grid, wherein PchangeAs measured values, H and SHydroThe frequency change rate f of the small hydropower station power grid can be determined according to the parameters and the formula for known quantityC。f1Frequency, f, of the small hydropower station grid2For the frequency of the main network (e.g. 50Hz), according to f1And f2Difference between, and rate of change of frequency f of the mini-hydro electric networkCThe out-of-limit time Tc can be calculated.
And S220, determining power regulation time of the power grid of the small hydropower station according to the first time and the out-of-limit time.
Illustratively, the first time of disconnection of the main grid from the mini-hydropower grid is T, the out-of-limit time is Tc, and the power regulation time is T0, the first time T and the out-of-limit time Tc are compared to determine a power regulation time T0 of the mini-hydropower grid, and the exchange power of the mini-hydropower grid is regulated at the out-of-limit time Tc before the first time T of disconnection of the main grid from the mini-hydropower grid so that the exchange power is 0, i.e. before the first time T, a time greater than or equal to the out-of-limit time Tc is reserved, for example, T0 ═ T-Tc, or T minus a value greater than Tc, to ensure that the regulation of the mini-hydropower grid exchange power is completed before the first time T to ensure that the mini-hydropower grid operates stably when the main grid is disconnected from the mini-hydropower grid to form an islanding effect.
And S230, adjusting the exchange power in the power adjusting time to enable the exchange power to be zero.
In particular, the exchange power of the mini-hydropower-station grid is adjusted at a power adjustment time T0 such that the frequency f of the main grid is2Frequency f of small hydropower station network1Difference f of2-f1And when the main power grid is disconnected with the small hydropower station power grid, the small hydropower station power grid reaches a system stable state.
Optionally, adjusting the switching power at the power adjustment time to make the switching power zero comprises: when the exchange power is larger than zero, reducing the output power of a hydroelectric generating set of the small hydropower station power grid; and when the exchange power is less than zero, increasing the output power of the hydroelectric generating set of the small hydropower station power grid.
The exchange power is exemplarily related to the grid system frequency, and the purpose of adjusting the frequency of the mini-hydropower-station grid can be achieved by adjusting the exchange power of the mini-hydropower-station grid. When adjusting the switching power, if the switching power P is adjustedchangeIf the output power of the hydroelectric generating set of the small hydropower station power grid is more than 0, the output power of the hydroelectric generating set can be reduced, for example, the output power of the hydroelectric generating set can be reduced by slowing down the drainage speed of the hydroelectric generating set, increasing the load of the hydroelectric generating set or storing energy of the small hydropower station, so that the exchange power of the small hydropower station power grid is changed, and the frequency adjustment is realized. If exchanging the power PchangeIf > 0, the increase is smallThe output power of the hydroelectric generating sets of the hydropower station power grid is increased, for example, by increasing the generating capacity of the hydroelectric generating sets or reducing the load energy supply, so that the output power of the hydroelectric generating sets is increased, the exchange power of the small hydropower station power grid is changed, and the frequency adjustment is realized.
DETAILED DESCRIPTION OF EMBODIMENT (S) OF INVENTION
Fig. 3 is a schematic flow chart of another control method for a small hydropower station grid according to an embodiment of the present invention, and the present embodiment may further describe a specific process of the control method for the small hydropower station grid based on the above embodiment. As shown in fig. 3, the method may specifically include:
s310, acquiring a time node for disconnecting a circuit breaker between the main power grid and the small hydropower station power grid.
And S320, measuring the exchange power between the small hydropower station power grid and the main power grid when the small hydropower station power grid is stable.
S330, judging whether the absolute value of the exchange power is smaller than or equal to the limit power of the hydroelectric generating set of the small hydropower station power grid.
If the absolute value of the exchange power is larger than the limit power of the hydroelectric generating set of the small hydropower station power grid, S340 is executed; if the absolute value of the exchange power is less than or equal to the limit power of the hydroelectric generating set of the small hydropower station power grid, S350 is executed.
And S340, splitting the power grid system of the small hydropower station.
And S350, calculating out-of-limit time of the frequency change of the small hydropower station power grid corresponding to the exchange power.
And S360, adjusting the exchange power before disconnecting a time node of a circuit breaker between the main power grid and the small hydropower station power grid according to the out-of-limit time of the frequency change of the small hydropower station power grid so as to enable the frequency difference value between the small hydropower station power grid and the main power grid to be zero.
And S370, disconnecting a breaker between the main power grid and the small hydropower station power grid.
EXAMPLE III
Fig. 4 is a schematic structural diagram of a control device for a small hydropower station grid according to an embodiment of the invention, which is applicable to control of the small hydropower station grid to cope with an islanding effect caused by disconnection of a main grid and the small hydropower station grid. The control device of the small hydropower station power grid provided by the embodiment of the invention can execute the control method of the small hydropower station power grid provided by any embodiment of the invention, and has corresponding functional modules and beneficial effects of the execution method.
As shown in fig. 4, the apparatus specifically includes a first time obtaining module 410, a switching power measuring module 420, a first control module 430, and a second control module 440, where:
the first time obtaining module 410 is configured to obtain a first time when the main grid is disconnected from the mini-hydropower station grid;
the exchange power measurement module 420 is used for measuring the exchange power between the main power grid and the small hydropower station when the power grid is stable;
the first control module 430 is configured to adjust the exchange power before the first time to zero when the exchange power meets the adjustment requirement of the mini-hydropower-station grid;
the second control module 440 is configured to disconnect the mini-hydropower station grid when the exchange power does not meet the regulation demand of the mini-hydropower station grid.
The control device for the small hydropower station power grid provided by the embodiment of the invention can execute the control method for the small hydropower station power grid provided by any embodiment of the invention, has corresponding functional modules and beneficial effects of the execution method, and is not described again here.
Example four
Fig. 5 is a schematic structural diagram of a terminal according to an embodiment of the present invention. FIG. 5 illustrates a block diagram of an exemplary electronic device 512 that may be suitable for use in implementing embodiments of the present invention. The electronic device 512 shown in fig. 5 is only an example and should not bring any limitations to the function and scope of use of the embodiments of the present invention.
As shown in fig. 5, the electronic device 512 is in the form of a general-purpose device. Components of the electronic device 512 may include, but are not limited to: one or more processors 516, a storage device 528, and a bus 518 that couples the various system components including the storage device 528 and the processors 516.
Bus 518 represents one or more of any of several types of bus structures, including a memory device bus or memory device controller, a peripheral bus, an accelerated graphics port, and a processor or local bus using any of a variety of bus architectures. By way of example, such architectures include, but are not limited to, Industry Standard Architecture (ISA) bus, Micro Channel Architecture (MAC) bus, enhanced ISA bus, Video Electronics Standards Association (VESA) local bus, and Peripheral Component Interconnect (PCI) bus.
Electronic device 512 typically includes a variety of computer system readable media. Such media can be any available media that is accessible by electronic device 512 and includes both volatile and nonvolatile media, removable and non-removable media.
Storage 528 may include computer system readable media in the form of volatile Memory, such as Random Access Memory (RAM) 530 and/or cache Memory 532. The electronic device 512 may further include other removable/non-removable, volatile/nonvolatile computer system storage media. By way of example only, storage system 535 may be used to read from and write to non-removable, nonvolatile magnetic media (not shown in FIG. 5, commonly referred to as a "hard drive"). Although not shown in FIG. 5, a magnetic disk drive for reading from and writing to a removable, nonvolatile magnetic disk (e.g., a "floppy disk") and an optical disk drive for reading from or writing to a removable, nonvolatile optical disk such as a Compact disk Read-Only Memory (CD-ROM), Digital Video disk Read-Only Memory (DVD-ROM), or other optical media may be provided. In these cases, each drive may be connected to bus 518 through one or more data media interfaces. Storage 528 may include at least one program product having a set (e.g., at least one) of program modules that are configured to carry out the functions of embodiments of the invention.
A program/utility 550 having a set (at least one) of program modules 552 may be stored, for instance, in storage 528, such program modules 552 including, but not limited to, an operating system, one or more application programs, other program modules, and program data, each of which examples or some combination thereof may include an implementation of a network environment. The program modules 552 generally perform the functions and/or methodologies of the described embodiments of the invention.
The electronic device 512 may also communicate with one or more external electronic devices 515 (e.g., keyboard, pointing terminal, display 525, etc.), with one or more terminals that enable a user to interact with the electronic device 512, and/or with any terminals (e.g., network card, modem, etc.) that enable the electronic device 512 to communicate with one or more other computing terminals. Such communication may occur via input/output (I/O) interfaces 522. Also, the electronic device 512 may communicate with one or more networks (e.g., a Local Area Network (LAN), a Wide Area Network (WAN), and/or a public Network, such as the internet) via the Network adapter 520. As shown in FIG. 5, the network adapter 520 communicates with the other modules of the electronic device 512 via the bus 518. It should be appreciated that although not shown, other hardware and/or software modules may be used in conjunction with the electronic device 512, including but not limited to: microcode, end drives, Redundant processors, external disk drive Arrays, RAID (Redundant Arrays of Independent Disks) systems, tape drives, and data backup storage systems, among others.
The processor 516 executes various functional applications and data processing by running a program stored in the storage device 528, for example, to implement a method for controlling a small hydropower station grid according to an embodiment of the present invention, the method including:
acquiring first time when a main power grid is disconnected with a small hydropower station power grid;
measuring the exchange power between the small hydropower station and a main power grid when the power grid is stable;
if the exchange power meets the adjustment requirement of the small hydropower station power grid, adjusting the exchange power before the first time to enable the exchange power to be zero;
and if the exchange power does not meet the regulation requirement of the small hydropower station power grid, splitting the small hydropower station power grid.
EXAMPLE five
An embodiment of the present invention further provides a computer-readable storage medium, on which a computer program is stored, where the computer program, when executed by a processor, implements a method for controlling a small hydropower station grid according to an embodiment of the present invention, where the method includes:
acquiring first time when a main power grid is disconnected with a small hydropower station power grid;
measuring the exchange power between the small hydropower station and a main power grid when the power grid is stable;
if the exchange power meets the adjustment requirement of the small hydropower station power grid, adjusting the exchange power before the first time to enable the exchange power to be zero;
and if the exchange power does not meet the regulation requirement of the small hydropower station power grid, splitting the small hydropower station power grid.
Computer storage media for embodiments of the invention may employ any combination of one or more computer-readable media. The computer readable medium may be a computer readable signal medium or a computer readable storage medium. A computer readable storage medium may be, for example, but not limited to, an electronic, magnetic, optical, electromagnetic, infrared, or semiconductor system, apparatus, or device, or any combination of the foregoing. More specific examples (a non-exhaustive list) of the computer readable storage medium would include the following: an electrical connection having one or more wires, a portable computer diskette, a hard disk, a Random Access Memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber, a portable compact disc read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination of the foregoing. In the context of this document, a computer readable storage medium may be any tangible medium that can contain, or store a program for use by or in connection with an instruction execution system, apparatus, or device.
A computer readable signal medium may include a propagated data signal with computer readable program code embodied therein, for example, in baseband or as part of a carrier wave. Such a propagated data signal may take many forms, including, but not limited to, electro-magnetic, optical, or any suitable combination thereof. A computer readable signal medium may also be any computer readable medium that is not a computer readable storage medium and that can communicate, propagate, or transport a program for use by or in connection with an instruction execution system, apparatus, or device.
Program code embodied on a computer readable medium may be transmitted using any appropriate medium, including but not limited to wireless, wireline, optical fiber cable, RF, etc., or any suitable combination of the foregoing.
Computer program code for carrying out operations for aspects of the present invention may be written in any combination of one or more programming languages, including an object oriented programming language such as Java, Smalltalk, C + + or the like and conventional procedural programming languages, such as the "C" programming language or similar programming languages. The program code may execute entirely on the user's computer, partly on the user's computer, as a stand-alone software package, partly on the user's computer and partly on a remote computer or entirely on the remote computer or terminal. In the case of a remote computer, the remote computer may be connected to the user's computer through any type of network, including a Local Area Network (LAN) or a Wide Area Network (WAN), or the connection may be made to an external computer (for example, through the Internet using an Internet service provider).
It is to be noted that the foregoing is only illustrative of the preferred embodiments of the present invention and the technical principles employed. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments described herein, but is capable of various obvious changes, rearrangements and substitutions as will now become apparent to those skilled in the art without departing from the scope of the invention. Therefore, although the present invention has been described in greater detail by the above embodiments, the present invention is not limited to the above embodiments, and may include other equivalent embodiments without departing from the spirit of the present invention, and the scope of the present invention is determined by the scope of the appended claims.

Claims (9)

1. A method of controlling a mini-hydropower station grid, comprising:
acquiring first time when a main power grid is disconnected with a small hydropower station power grid;
measuring the exchange power between the small hydropower station power grid and the main power grid when the small hydropower station power grid is stable;
if the exchange power meets the adjustment requirement of the small hydropower station power grid, adjusting the exchange power of the small hydropower station power grid before the first time so as to enable the exchange power to be zero;
if the exchange power does not meet the regulation requirement of the small hydropower station power grid, splitting the small hydropower station power grid;
wherein adjusting the exchange power of the mini-hydropower-station grid before the first time to be zero comprises:
calculating out-of-limit time required for the frequency change of the small hydropower station grid to the frequency of the main grid;
determining power adjustment time of the small hydropower station power grid according to the first time and the out-of-limit time;
adjusting the switching power at the power adjustment time to bring the switching power to zero.
2. The method according to claim 1, wherein the exchange power is the product of a voltage value and a current value on the side of the mini-hydro power plant grid connected to the main grid.
3. The method of claim 1, wherein the exchange power comprises active exchange power and reactive exchange power, and the regulatory requirements of the mini-hydropower grid comprise:
the absolute value of the active exchange power is less than or equal to the active limit power of a hydroelectric generating set of the small hydropower station power grid; and/or the absolute value of the reactive exchange power is less than or equal to the reactive limit power of the hydroelectric generating set of the small hydropower station power grid.
4. The method of claim 1, wherein calculating the out-of-limit time required for the frequency of the mini-hydro power plant grid to change to the frequency of the main grid comprises:
calculating the frequency change rate of the small hydropower station power grid corresponding to the exchange power;
and calculating the out-of-limit time according to the difference value of the frequency of the small hydropower station power grid and the frequency of the main power grid and the frequency change rate.
5. The method of claim 4, wherein the time-out-of-limit is calculated as:
f1-f2＝TC·fC；
wherein the content of the first and second substances,
Figure FDA0003598763040000021
TCfor said out-of-limit time, f1For the frequency, f, of the electric network of said small hydropower station2Is the frequency of the main power grid, fCFor said rate of change of frequency, PchangeFor the exchange power, H is a water wheel inertia time constant of a hydroelectric generating set of the small hydropower station power grid, SHydroThe capacity of a hydroelectric generating set of the small hydropower station power grid.
6. The method of claim 1, wherein adjusting the switching power at the power adjustment time to bring the switching power to zero comprises:
when the exchange power is larger than zero, reducing the output power of a hydroelectric generating set of the small hydropower station power grid;
and when the exchange power is less than zero, increasing the output power of the hydroelectric generating set of the small hydropower station power grid.
7. A control device for a mini-hydropower grid, comprising:
the first time acquisition module is used for acquiring the first time when the main power grid is disconnected with the small hydropower station power grid;
the exchange power measurement module is used for measuring the exchange power between the small hydropower station and the main power grid when the power grid is stable;
a first control module for adjusting the exchange power of the mini-hydropower station grid before the first time to make the exchange power zero when the exchange power meets the adjustment requirement of the mini-hydropower station grid;
the second control module is used for splitting the small hydropower station power grid when the exchange power does not meet the regulation requirement of the small hydropower station power grid;
wherein adjusting the exchange power of the mini-hydropower-station grid before the first time to be zero comprises:
calculating out-of-limit time required for the frequency change of the small hydropower station grid to the frequency of the main grid;
determining power adjustment time of the small hydropower station power grid according to the first time and the out-of-limit time;
adjusting the switching power at the power adjustment time to bring the switching power to zero.
8. An electronic device, characterized in that the electronic device comprises:
one or more processors;
storage means for storing one or more programs;
when executed by the one or more processors, cause the one or more processors to implement the method of controlling a mini-hydropower-station grid according to any one of claims 1-6.
9. A computer-readable storage medium, on which a computer program is stored, characterized in that the program, when being executed by a processor, carries out a method for controlling a mini-hydropower-station grid according to any one of claims 1-6.
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